Gotowe bibliografie tematyczne / Orthogonal time frequency space

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Gotowa bibliografia na temat „Orthogonal time frequency space”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Orthogonal time frequency space"

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Tiwari, S., i S. S. Das. "Circularly pulse‐shaped orthogonal time frequency space modulation". Electronics Letters 56, nr 3 (luty 2020): 157–60. http://dx.doi.org/10.1049/el.2019.2503.

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Aksoy, K., i Ü Aygölü. "Super-orthogonal space-time-frequency trellis coded OFDM". IET Communications 1, nr 3 (2007): 317. http://dx.doi.org/10.1049/iet-com:20060094.

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Fazel, F., i H. Jafarkhani. "Quasi-Orthogonal Space-Frequency and Space-Time-Frequency Block Codes for MIMO OFDM Channels". IEEE Transactions on Wireless Communications 7, nr 1 (styczeń 2008): 184–92. http://dx.doi.org/10.1109/twc.2008.060420.

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Ren, Huarong, Weikai Xu i Lin Wang. "Multiple-Mode Orthogonal Time Frequency Space with Index Modulation". Electronics 11, nr 16 (19.08.2022): 2600. http://dx.doi.org/10.3390/electronics11162600.

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Recently, orthogonal time frequency space modulation with index modulation (OTFS-IM) has been proposed to improve the bit-error-rate (BER) performance of the OTFS system. However, only some of the grids in the OTFS-IM system are activated, resulting in low spectral efficiency (SE). In order to solve this problem, a new scheme called multiple-mode OTFS-IM (MM-OTFS-IM) is proposed in this paper. In the proposed scheme, all grids are activated to transmit modulation bits. Each grid in the subblock adopts a different modulation mode, and the index bits are transmitted implicitly by the combination of different constellation modes. At the receiver, a distance-based signal detection algorithm is designed, which uses the distance matrix to find the combination of the minimum sum of elements to recover the index bits. The simulation results demonstrate the enhanced performance of the proposed scheme in the time-varying channels.
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Zhendong Luo, Junshi Liu, Ming Zhao, Yuanan Liu i Jinchun Gao. "Double-orthogonal coded space-time-frequency spreading CDMA scheme". IEEE Journal on Selected Areas in Communications 24, nr 6 (czerwiec 2006): 1244–55. http://dx.doi.org/10.1109/jsac.2005.864007.

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Shao, Chao, Cun Yao Xu i Xin Shi. "A Column Orthogonality Space-Time-Frequency Coding Schemes". Advanced Materials Research 846-847 (listopad 2013): 1044–47. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.1044.

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A column orthogonal space-time-frequency coding scheme is presented, its induced cost207 transmit environment channel matrix has greater determinant value, which will lead result in amplifying the signal-to noise ratio of system, and improving the performance of the system. Computer simulations confirm the theory of the article.
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An, Changyoung, i Heung-Gyoon Ryu. "Design and Performance Evaluation of MIMO(Multiple Input Multiple Output) System Using OTFS(Orthogonal Time Frequency Space) Modulation". Journal of Korean Institute of Electromagnetic Engineering and Science 28, nr 6 (czerwiec 2017): 444–51. http://dx.doi.org/10.5515/kjkiees.2017.28.6.444.

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Zhao, Hang, Dongxuan He, Ziqi Kang i Hua Wang. "Orthogonal Time Frequency Space (OTFS) With Dual-Mode Index Modulation". IEEE Wireless Communications Letters 10, nr 5 (maj 2021): 991–95. http://dx.doi.org/10.1109/lwc.2021.3053981.

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Wei, Zhiqiang, Weijie Yuan, Shuangyang Li, Jinhong Yuan, Ganesh Bharatula, Ronny Hadani i Lajos Hanzo. "Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform". IEEE Wireless Communications 28, nr 4 (sierpień 2021): 136–44. http://dx.doi.org/10.1109/mwc.001.2000408.

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Li, Qiao, Zheng Xiang, Peng Ren i Wanlu Li. "Variational autoencoder based receiver for orthogonal time frequency space modulation". Digital Signal Processing 117 (październik 2021): 103170. http://dx.doi.org/10.1016/j.dsp.2021.103170.

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Rozprawy doktorskie na temat "Orthogonal time frequency space"

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Lee, King F. "Space-time and space-frequency coded orthogonal frequency division multiplexing transmitter diversity techniques". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14981.

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Wong, Kar Lun (Clarence). "Space-time-frequency channel estimation for multiple-antenna orthogonal frequency division multiplexing systems". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100244.

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We propose a linear mean square error channel estimator that exploits the joint space-time-frequency (STF) correlations of the wireless fading channel for applications in multiple-antenna orthogonal frequency division multiplexing systems. Our work generalizes existing channel estimators to the full dimensions including transmit spatial, receive spatial, time, and frequency. This allows versatile applications of our STF channel estimator to any fading environment, ranging from spatially-uncorrelated slow-varying frequency-flat channels to spatially-correlated fast-varying frequency-selective channels.
The proposed STF channel estimator reduces to a time-frequency (TF) channel estimator when no spatial correlations exist. In another perspective, the lower-dimension TF channel estimator can be viewed as an STF channel estimator with spatial correlation mismatch for space-time-frequency selective channels.
Computer simulations were performed to study the mean-square-error (MSE) behavior with different pilot parameters. We then evaluate the suitability of our STF channel estimator on a space-frequency block coded OFDM system. Bit error rate (BER) performance degradation, with respect to perfect coherent detection, is limited to less than 2 dB at a BER of 10-5 in the modified 3GPP fast-fading suburban macro environment. Modifications to the 3GPP channel involves reducing the base station angle spread to imitate a high transmit spatial correlation scenario to emphasize the benefit of exploiting spatial correlation in our STF channel estimator.
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Karaoglu, Bulent. "A comparison of frequency offset estimation methods in Orthogonal Frequency Division Multiplexing (OFDM) systems". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FKaraoglu.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, Dec. 2004.
Thesis Advisor(s): Roberto Cristi, Murali Tummala. Includes bibliographical references (p. 45-46). Also available online.
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Saglam, Halil Derya. "Simulation performance of multiple-input multiple-output systems employing single-carrier modulation and orthogonal frequency division multiplexing". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FSaglam.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, Dec. 2004.
Thesis advisor(s): Murali Tummala, Roberto Cristi. Includes bibliographical references (p. 69-71). Also available online.
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Owojaiye, Gbenga Adetokunbo. "Design and performance analysis of distributed space time coding schemes for cooperative wireless networks". Thesis, University of Hertfordshire, 2012. http://hdl.handle.net/2299/8970.

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In this thesis, space-time block codes originally developed for multiple antenna systems are extended to cooperative multi-hop networks. The designs are applicable to any wireless network setting especially cellular, adhoc and sensor networks where space limitations preclude the use of multiple antennas. The thesis first investigates the design of distributed orthogonal and quasi-orthogonal space time block codes in cooperative networks with single and multiple antennas at the destination. Numerical and simulation results show that by employing multiple receive antennas the diversity performance of the network is further improved at the expense of slight modification of the detection scheme. The thesis then focuses on designing distributed space time block codes for cooperative networks in which the source node participates in cooperation. Based on this, a source-assisting strategy is proposed for distributed orthogonal and quasi-orthogonal space time block codes. Numerical and simulation results show that the source-assisting strategy exhibits improved diversity performance compared to the conventional distributed orthogonal and quasi-orthogonal designs.Motivated by the problem of channel state information acquisition in practical wireless network environments, the design of differential distributed space time block codes is investigated. Specifically, a co-efficient vector-based differential encoding and decoding scheme is proposed for cooperative networks. The thesis then explores the concatenation of differential strategies with several distributed space time block coding schemes namely; the Alamouti code, square-real orthogonal codes, complex-orthogonal codes, and quasiorthogonal codes, using cooperative networks with different number of relay nodes. In order to cater for high data rate transmission in non-coherent cooperative networks, differential distributed quasi-orthogonal space-time block codes which are capable of achieving full code-rate and full diversity are proposed. Simulation results demonstrate that the differential distributed quasi-orthogonal space-time block codes outperform existing distributed space time block coding schemes in terms of code rate and bit-error-rate performance. A multidifferential distributed quasi-orthogonal space-time block coding scheme is also proposed to exploit the additional diversity path provided by the source-destination link.A major challenge is how to construct full rate codes for non-coherent cooperative broadband networks with more than two relay nodes while exploiting the achievable spatial and frequency diversity. In this thesis, full rate quasi-orthogonal codes are designed for noncoherent cooperative broadband networks where channel state information is unavailable. From this, a generalized differential distributed quasi-orthogonal space-frequency coding scheme is proposed for cooperative broadband networks. The proposed scheme is able to achieve full rate and full spatial and frequency diversity in cooperative networks with any number of relays. Through pairwise error probability analysis we show that the diversity gain of the proposed scheme can be improved by appropriate code construction and sub-carrier allocation. Based on this, sufficient conditions are derived for the proposed code structure at the source node and relay nodes to achieve full spatial and frequency diversity. In order to exploit the additional diversity paths provided by the source-destination link, a novel multidifferential distributed quasi-orthogonal space-frequency coding scheme is proposed. The overall objective of the new scheme is to improve the quality of the detected signal at the destination with negligible increase in the computational complexity of the detector.Finally, a differential distributed quasi-orthogonal space-time-frequency coding scheme is proposed to cater for high data rate transmission and improve the performance of noncoherent cooperative broadband networks operating in highly mobile environments. The approach is to integrate the concept of distributed space-time-frequency coding with differential modulation, and employ rotated constellation quasi-orthogonal codes. From this, we design a scheme which is able to address the problem of performance degradation in highly selective fading environments while guaranteeing non-coherent signal recovery and full code rate in cooperative broadband networks. The coding scheme employed in this thesis relaxes the assumption of constant channel variation in the temporal and frequency dimensions over long symbol periods, thus performance degradation is reduced in frequencyselective and time-selective fading environments. Simulation results illustrate the performance of the proposed differential distributed quasi-orthogonal space-time-frequency coding scheme under different channel conditions.
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Mody, Apurva Narendra. "Signal Acquisition and Tracking for Fixed Wireless Access Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7624.

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The general objective of this proposed research is to design and develop signal acquisition and tracking algorithms for multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems for fixed wireless access applications. The algorithms are specifically targeted for systems that work in time division multiple access and frequency division multiple access frame modes. In our research, we first develop a comprehensive system model for a MIMO-OFDM system under the influence of the radio frequency (RF) oscillator frequency offset, sampling frequency (SF) offset, RF oscillator phase noise, frequency selective channel impairments and finally the additive white Gaussian noise. We then develop the acquisition and tracking algorithms to estimate and track all these parameters. The acquisition and tracking algorithms are assisted by a preamble consisting of one or more training sequences and pilot symbol matrices. Along with the signal acquisition and tracking algorithms, we also consider design of the MIMO-OFDM preamble and pilot signals that enable the suggested algorithms to work efficiently. Signal acquisition as defined in our research consists of time and RF synchronization, SF offset estimation and correction, phase noise estimation and correction and finally channel estimation. Signal tracking consists of RF, SF, phase noise and channel tracking. Time synchronization, RF oscillator frequency offset, SF oscillator frequency offset, phase noise and channel estimation and tracking are all research topics by themselves. A large number of studies have addressed these issues, but usually individually and for single-input single-output (SISO) OFDM systems. In the proposed research we present a complete suite of signal acquisition and tracking algorithms for MIMO-OFDM systems along with Cramr-Rao bounds for the SISO-OFDM case. In addition, we also derive the Maximum Likelihood (ML) estimates of the parameters for the SISO-OFDM case. Our proposed research is unique from the existing literature in that it presents a complete receiver implementation for MIMO-OFDM systems and accounts for the cumulative effects of all possible acquisition and tracking errors on the bit error rate (BER) performance. The suggested algorithms and the pilot/training schemes may be applied to any MIMO OFDM system and are independent of the space-time coding techniques that are employed.
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Awwad, Elie. "Techniques émergentes de codage espace-temps pour les systèmes de communications optiques". Thesis, Paris, ENST, 2015. http://www.theses.fr/2015ENST0004/document.

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La recherche dans le domaine des communications sur fibres optiques avance à un rythme rapide afin de satisfaire des demandes croissantes de communications à débits élevés. Les principaux moteurs de ces avancements sont la multitude de degrés de liberté offerts par la fibre permettant ainsi la transmission de plus de données: l'amplitude, la phase et l'état de polarisation du champ optique, ainsi que le temps et la longueur d'onde sont déjà utilisés dans les systèmes de transmission optique déployés. Pourtant, ces systèmes s'approchent de leur limite fondamentale de capacité et un degré supplémentaire: "la dimension spatiale" est étudié pour réaliser un saut qualitatif majeur en termes de capacité de transmission. Cependant, l'insertion de plusieurs flux de données dans le même canal de propagation induit également des pertes différentielles et de la diaphonie entre les flux, ce qui peut fortement réduire la qualité du système de transmission. Dans cette thèse, nous nous concentrons sur les systèmes de transmission optique de type MIMO basés sur un multiplexage en polarisation ou en modes de propagation. Dans les deux cas, nous évaluons la dégradation de la performance provoquée par une interférence inter-canaux non-unitaire et des disparités de gain entre les canaux engendrées par des imperfections dans les composants optiques utilisés (fibres, amplificateurs, multiplexeurs...), et proposons pour les combattre, de nouvelles techniques de codage pour les systèmes MIMO nommées "codes Spatio-Temporels" (ST), préalablement conçues pour les systèmes radios multi-antennaires
Research in the field of optical fiber communications is advancing at a rapid pace in order to meet the growing needs for higher data rates. The main driving forces behind these advancements are the availability of multiple degrees of freedom in the optical fiber allowing for multiplexing more data: amplitude, phase and polarization state of the optical field, along with time and wavelength are already used in the deployed optical transmission systems. Yet, these systems are approaching their theoretical capacity limits and an extra dimension "space" is investigated to achieve the next capacity leap. However, packing several data channels in the same medium brings with it differential impairments and crosstalk that can seriously deteriorate the performance of the system. In this thesis, we focus on recent optical MIMO schemes based on polarization division multiplexing (PDM) and space division multiplexing (SDM). In both, we assess the performance penalties induced by non-unitary crosstalk and loss disparities among the channels arising from imperfections in the used optical components (fibers, amplifiers, multiplexers...), and suggest novel MIMO coding techniques known as Space-Time (ST) codes, initially designed for wireless multi-antenna channels, to mitigate them
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Diameh, Yousef A. "The optimization of multiple antenna broadband wireless communications. A study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems". Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6361.

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This work concentrates on the application of diversity techniques and space time block coding for future mobile wireless communications. The initial system analysis employs a space-time coded OFDM transmitter over a multipath Rayleigh channel, and a receiver which uses a selection combining diversity technique. The performance of this combined scenario is characterised in terms of the bit error rate and throughput. A novel four element QOSTBC scheme is introduced, it is created by reforming the detection matrix of the original QOSTBC scheme, for which an orthogonal channel matrix is derived. This results in a computationally less complex linear decoding scheme as compared with the original QOSTBC. Space time coding schemes for three, four and eight transmitters were also derived using a Hadamard matrix. The practical optimization of multi-antenna networks is studied for realistic indoor and mixed propagation scenarios. The starting point is a detailed analysis of the throughput and field strength distributions for a commercial dual band 802.11n MIMO radio operating indoors in a variety of line of sight and non-line of sight scenarios. The physical model of the space is based on architectural schematics, and realistic propagation data for the construction materials. The modelling is then extended and generalized to a multi-storey indoor environment, and a large mixed site for indoor and outdoor channels based on the Bradford University campus. The implications for the physical layer are also explored through the specification of antenna envelope correlation coefficients. Initially this is for an antenna module configuration with two independent antennas in close proximity. An operational method is proposed using the scattering parameters of the system and which incorporates the intrinsic power losses of the radiating elements. The method is extended to estimate the envelope correlation coefficient for any two elements in a general (N,N) MIMO antenna array. Three examples are presented to validate this technique, and very close agreement is shown to exist between this method and the full electromagnetic analysis using the far field antenna radiation patterns.
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Dia'meh, Yousef Ali. "The optimization of multiple antenna broadband wireless communications : a study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems". Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6361.

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This work concentrates on the application of diversity techniques and space time block coding for future mobile wireless communications. The initial system analysis employs a space-time coded OFDM transmitter over a multipath Rayleigh channel, and a receiver which uses a selection combining diversity technique. The performance of this combined scenario is characterised in terms of the bit error rate and throughput. A novel four element QOSTBC scheme is introduced, it is created by reforming the detection matrix of the original QOSTBC scheme, for which an orthogonal channel matrix is derived. This results in a computationally less complex linear decoding scheme as compared with the original QOSTBC. Space time coding schemes for three, four and eight transmitters were also derived using a Hadamard matrix. The practical optimization of multi-antenna networks is studied for realistic indoor and mixed propagation scenarios. The starting point is a detailed analysis of the throughput and field strength distributions for a commercial dual band 802.11n MIMO radio operating indoors in a variety of line of sight and non-line of sight scenarios. The physical model of the space is based on architectural schematics, and realistic propagation data for the construction materials. The modelling is then extended and generalized to a multi-storey indoor environment, and a large mixed site for indoor and outdoor channels based on the Bradford University campus. The implications for the physical layer are also explored through the specification of antenna envelope correlation coefficients. Initially this is for an antenna module configuration with two independent antennas in close proximity. An operational method is proposed using the scattering parameters of the system and which incorporates the intrinsic power losses of the radiating elements. The method is extended to estimate the envelope correlation coefficient for any two elements in a general (N,N) MIMO antenna array. Three examples are presented to validate this technique, and very close agreement is shown to exist between this method and the full electromagnetic analysis using the far field antenna radiation patterns.
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Anoh, Kelvin Ogbonnaya Okorie. "Advanced MIMO-OFDM technique for future high speed braodband wireless communications : a study of OFDM design, using wavelet transform, fractional fourier transform, fast fourier transform, doppler effect, space-time coding for multiple input, multiple output wireless communications systems". Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14400.

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This work concentrates on the application of diversity techniques and space time block coding for future high speed mobile wireless communications on multicarrier systems. At first, alternative multicarrier kernels robust for high speed doubly-selective fading channel are sought. They include the comparisons of discrete Fourier transform (DFT), fractional Fourier transform (FrFT) and wavelet transform (WT) multicarrier kernels. Different wavelet types, including the raised-cosine spectrum wavelets are implemented, evaluated and compared. From different wavelet families, orthogonal wavelets are isolated from detailed evaluations and comparisons as suitable for multicarrier applications. The three transforms are compared over a doubly-selective channel with the WT significantly outperforming all for high speed conditions up to 300 km/hr. Then, a new wavelet is constructed from an ideal filter approximation using established wavelet design algorithms to match any signal of interest; in this case under bandlimited criteria. The new wavelet showed better performance than other traditional orthogonal wavelets. To achieve MIMO communication, orthogonal space-time block coding, OSTBC, is evaluated next. First, the OSTBC is extended to assess the performance of the scheme over extended receiver diversity order. Again, with the extended diversity conditions, the OSTBC is implemented for a multicarrier system over a doubly-selective fading channel. The MIMO-OFDM systems (implemented using DFT and WT kernels) are evaluated for different operating frequencies, typical of LTE standard, with Doppler effects. It was found that, during high mobile speed, it is better to transmit OFDM signals using lower operating frequencies. The information theory for the 2-transmit antenna OSTBC does not support higher order implementation of multi-antenna systems, which is required for the future generation wireless communications systems. Instead of the OSTBC, the QO-STBC is usually deployed to support the design of higher order multi-antenna systems other than the 2-transmit antenna scheme. The performances of traditional QO-STBC methods are diminished by some off-diagonal (interference) terms such that the resulting system does not attain full diversity. Some methods for eliminating the interference terms have earlier been discussed. This work follows the construction of cyclic matrices with Hadamard matrix to derive QO-STBC codes construction which are N-times better than interference free QO-STBC, where N is the number of transmit antenna branches.
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Książki na temat "Orthogonal time frequency space"

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Liang, Guan Yong, i Tjhung Tjeng Thiang, red. Quasi-orthogonal space-time block code. London: Distributed by World Scientific, 2007.

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Le Tran, Chung, Tadeusz A. Wysocki, Alfred Mertins i Jennifer Seberry. Complex Orthogonal Space-Time Processing in Wireless Communications. Boston, MA: Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29544-2.

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Tran, Le Chung. Complex orthogonal space-time processing in wireless communications. New York: Springer, 2011.

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Combes, Jean-Michel. Wavelets: Time-Frequency Methods and Phase Space. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989.

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Deng, Wei. Time Multiplexed Beam-Forming with Space-Frequency Transformation. New York, NY: Springer New York, 2013.

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Deng, Wei, Reza Mahmoudi i Arthur H. M. van Roermund. Time Multiplexed Beam-Forming with Space-Frequency Transformation. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5046-7.

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Goldblatt, Robert. Orthogonality and spacetime geometry. New York: Springer-Verlag, 1987.

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Time-frequency analysis and synthesis of linear signal spaces: Time-frequency filters, signal detection and estimation, and range-Doppler estimation. Boston: Kluwer Academic Publishers, 1998.

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Swain, A. K. Weighted complex orthogonal estimator for identifying linear and nonlinear continuous time models from generalised frequency response functions. Sheffield: University of Sheffield, Dept. of Automatic Control and Systems Engineering, 1995.

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K, Brodzik Andrzej, i Tolimieri Richard 1940-, red. Ideal sequence design in time-frequency space: Applications to radar, sonar, and communication systems. Boston, Mass: Birkhäuser, 2009.

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Części książek na temat "Orthogonal time frequency space"

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Das, Suvra Sekhar, i Ramjee Prasad. "Channel Estimation in OTFS". W Orthogonal Time Frequency Space Modulation, 139–68. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-6.

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Das, Suvra Sekhar, i Ramjee Prasad. "Circulant Pulse Shaped OTFS". W Orthogonal Time Frequency Space Modulation, 129–38. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-5.

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Das, Suvra Sekhar, i Ramjee Prasad. "OTFS Signal Model". W Orthogonal Time Frequency Space Modulation, 89–102. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-3.

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Das, Suvra Sekhar, i Ramjee Prasad. "Receivers Structures for OTFS". W Orthogonal Time Frequency Space Modulation, 103–27. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-4.

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Das, Suvra Sekhar, i Ramjee Prasad. "Nonorthogonal Multiple Access with OTFS". W Orthogonal Time Frequency Space Modulation, 169–90. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-7.

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Das, Suvra Sekhar, i Ramjee Prasad. "A Summary of Waveforms for Wireless Channels". W Orthogonal Time Frequency Space Modulation, 9–88. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-2.

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Das, Suvra Sekhar, i Ramjee Prasad. "Introduction". W Orthogonal Time Frequency Space Modulation, 1–8. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339021-1.

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Saiprudhvi, Vangara, i R. Ramanathan. "Analysis of Orthogonal Time Frequency Space Transceiver in Baseband Environment". W Communications in Computer and Information Science, 290–303. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0422-5_21.

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Tolimieri, Richard, i Myoung An. "Orthogonal projection theorem". W Time-Frequency Representations, 135–39. Boston, MA: Birkhäuser Boston, 1998. http://dx.doi.org/10.1007/978-1-4612-4152-2_9.

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Gómez, Víctor. "Orthogonal Projection". W Multivariate Time Series With Linear State Space Structure, 1–60. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28599-3_1.

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Streszczenia konferencji na temat "Orthogonal time frequency space"

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Hadani, R., S. Rakib, M. Tsatsanis, A. Monk, A. J. Goldsmith, A. F. Molisch i R. Calderbank. "Orthogonal Time Frequency Space Modulation". W 2017 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2017. http://dx.doi.org/10.1109/wcnc.2017.7925924.

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Sun, Jinjing, Zulin Wang i Qin Huang. "Secure Precoded Orthogonal Time Frequency Space Modulation". W 2021 13th International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2021. http://dx.doi.org/10.1109/wcsp52459.2021.9613229.

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Blazek, Thomas, Herbert Groll, Stefan Pratschner i Erich Zochmann. "Vehicular Channel Characterization in Orthogonal Time-Frequency Space". W 2019 IEEE International Conference on Communications Workshops (ICC Workshops). IEEE, 2019. http://dx.doi.org/10.1109/iccw.2019.8756717.

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Zou, Xianbing, Shiwen Fan, Hao Chen, Yue Xiao, Chengliang Di i Jinwei Ji. "Orthogonal Time Frequency Space with Generalized Spatial Modulation". W 2022 IEEE 95th Vehicular Technology Conference (VTC2022-Spring). IEEE, 2022. http://dx.doi.org/10.1109/vtc2022-spring54318.2022.9860986.

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Owojaiye, Gbenga, Fabien Delestre i Yichuang Sun. "Differential distributed quasi-orthogonal space-time-frequency coding". W 2012 Wireless Advanced (WiAd) (Formerly known as SPWC). IEEE, 2012. http://dx.doi.org/10.1109/wiad.2012.6296545.

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Ren, Huarong, Weikai Xu i Lin Wang. "Orthogonal Time-Frequency Space with Improved Index Modulation". W 2021 15th International Conference on Signal Processing and Communication Systems (ICSPCS). IEEE, 2021. http://dx.doi.org/10.1109/icspcs53099.2021.9660349.

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Qian, Ying, Lixia Xiao i Tao Jiang. "SM-STBC aided Orthogonal Time Frequency Space Modulation". W 2022 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2022. http://dx.doi.org/10.1109/wcnc51071.2022.9771767.

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Biglieri, Ezio, Patchava Raviteja i Yi Hong. "Error Performance of Orthogonal Time Frequency Space (OTFS) Modulation". W 2019 IEEE International Conference on Communications Workshops (ICC Workshops). IEEE, 2019. http://dx.doi.org/10.1109/iccw.2019.8756831.

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Sun, Jinjing, Zulin Wang i Qin Huang. "An Orthogonal Time Frequency Space Direct Sequence Modulation Scheme". W 2021 IEEE International Conference on Communications Workshops (ICC Workshops). IEEE, 2021. http://dx.doi.org/10.1109/iccworkshops50388.2021.9473505.

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Raviteja, P., Khoa T. Phan, Yi Hong i Emanuele Viterbo. "Orthogonal Time Frequency Space (OTFS) Modulation Based Radar System". W 2019 IEEE Radar Conference (RadarConf19). IEEE, 2019. http://dx.doi.org/10.1109/radar.2019.8835764.

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Raporty organizacyjne na temat "Orthogonal time frequency space"

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Kuperman, William A., i Gerald D'Spain. Waveguide Invariants and Space-Frequency Time Signal Processing. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2002. http://dx.doi.org/10.21236/ada425248.

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Peavey, David, i Ernest Tsui. Performance of M-ary Orthogonal Continuous Phase FSK (Frequency Shift Keying) for a Trans-Ionospheric Time-Varying Frequency-Selective Channel. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1985. http://dx.doi.org/10.21236/ada165318.

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Maydykovskiy, Igor, i Petras Užpelkis. The Physical Essence of Time. Intellectual Archive, grudzień 2020. http://dx.doi.org/10.32370/iaj.2450.

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The article considers the model of the space-frequency-time continuum, according to which the physical essence of Time is manifested as a fraction of electromagnetic energy spent on updating a material object in a cyclic process of copying-incarnation. For all structural levels of physical reality, the value of this fraction is a fundamental constant, which can be represented as the tangent of the loss angle, or expressed in radians, as the angle of inclination of the evolutionary spiral, which characterizes the rate of change of states or the duration of events and processes. The value of this constant can be calculated, and its value turns out to be identically equals to the square of the fine structure Constant (α2). The description of the method for identifying a new constant allows us to present the formula of Scientific Discovery as the Physical Essence of Time.
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Hambur, Jonathan, i Qazi Haque. Can We Use High-frequency Yield Data to Better Understand the Effects of Monetary Policy and Its Communication? Yes and No! Reserve Bank of Australia, maj 2023. http://dx.doi.org/10.47688/rdp2023-04.

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Understanding the effects of monetary policy and its communication is crucial for a central bank. This paper explores a new approach to identifying the effects of monetary policy using high-frequency data around monetary policy decisions and other announcements that allows us to explore different facets of monetary policy, specifically: current policy action; signalling or forward guidance about future rates; and the effect on uncertainty and term premia. The approach provides an intuitive lens through which to understand how policy and its communication affected expectations for rates and risks during certain historical periods, and more generally. For example, it suggests that: (i) signalling/forward guidance shocks tended to raise expected future policy rates in the mid-2010s as the RBA highlighted rising risks in housing markets; (ii) COVID-19-era monetary policy worked mainly through affecting term premia rather than expectations for future policy rates, unlike pre-COVID-19 policy; and (iii) shocks to the expected path of rates are predictable based on data available at the time, which suggests that markets systematically misunderstand how the RBA reacts to data, highlighting the importance of clear communication. We also explore the macroeconomic effects of these different shocks. The effects of shocks to current policy are similar to those estimated in previous papers, and existing issues such as the 'price puzzle' remain, while the effects of other shocks are imprecisely estimated. Although the approach provides little new information on the macroeconomic effects of monetary policy, it does highlight the importance of these other facets of policy in moving interest rates and suggests additional work in this space could be valuable.
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Wilson, D., Vladimir Ostashev i Chris Pettit. Distribution of the two-point product of complex amplitudes in the fully saturated scattering regime. Engineer Research and Development Center (U.S.), listopad 2020. http://dx.doi.org/10.21079/11681/38701.

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This Letter considers probability density functions (pdfs) involving products of the complex amplitudes observed at two points (which may, in general, involve separations in space, time, or frequency) in conditions of fully saturated scattering. First, the pdf is derived for the product of the complex amplitude at one point with the conjugate of the complex amplitude at another point. It is shown that the real and imaginary parts of this product each have a variance gamma pdf. Second, expressions are derived for several joint pdfs involving complex amplitude products and powers at two points.
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Jacobsen, Nils. Linjebussens vekst og fall i den voksende byen: en studie av bybussenes geografiske kvalitet Stavanger – Sandnes 1920 – 2010. University of Stavanger, listopad 2019. http://dx.doi.org/10.31265/usps.244.

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Linear city bus services are facing increased challenges from city growth. Increased number of inhabitants on increasing acres of built-up areas, makes it demanding to maintain adequate bus services within reasonable catchment areas. Number of departures per hour give a partial description of the bus service quality. Number of departures give reference to the time aspect of bus service quality, but say nothing about the geographical aspect. What part of the entire line network is within reach of direct bus service when frequencies are limited? To address the geographical aspect of bus service quality, the term network ratio is introduced. The term Network Ratio (NR) signifies what part of the entire line network is within reach of direct bus service to or from a certain place in the network. Network Ratio is given as a mathematical term whereby direct bus lines are calculated as a percentage of the entire network. The character and development of Network Ratio in a specific city is illustrated through an analysis of the urban growth of line network and built-up areas in the twin cities of Stavanger and Sandnes. The analysis is covering the period 1920 – 2000 in intervals of 20 years from the first bus lines were established in the urban area. Year 2010 is also included due to major changes implemented right after the turn of the millennium. Development show there is a close relation between bus network and built-up areas. When areas are being built, bus lines follow. The initial fase 1920 – 40 with extensive development of bus lines combined with some areal growth, is followed by a fase of consolidation 1940 – 60. The latter period is characterized by moderate areal growth, extended lines reducing network ratios, and increasing frequencies on the best bus lines. Extensive areal growth in the following period 1960 – 80, implies increased number of bus lines. As a consequence network ratios as well as frequencies are falling in the entire network. In 1960 certain lines had developed as much as 6 departures per hour, while maximum bus line frequency in 1980 has diminished to 2. New bus service development is introduced in the following period between 1980 and 2000. Numerous bus companies are united, and a more comprehensive planning of bus services are applied. The number of bus lines is stabilized at about 40, the fall in network ratio is reduced, and certain lines develop 4 departures per hour. Parallell to the bus development, growth of built-up areas is slowing down due to increased urban renewal with higher densities within built-up areas. In the period 2000 – 2010 new efforts are given to the development of bus services. Development of Network Ratio takes a new direction: The length of network links with high NR is increasing, while links with very low NR are diminishing. Number of bus lines is decreasing, and by 2010 almost 50% of the bus lines are served with 4 departures or more. Passenger comfort is improved in buses as well as on bus stops, and low floor buses are introduced to ease accessibility. Bus service quality is further developed after 2010. Digital services are introduced including digital ticketing, bus service information and real-time information on internet. In addition real-time information is presented at high frequency bus stops through visual screen and auditory speaker. Inside the buses name of next stop is given on screen and through loudspeaker. Further development of the bus services, should include improved Network Ratios in the entire network, as well as increased frequencies on major bus corridors. The latter is a task not only for the bus service planners, but just as well for the city planners and politicians in collaboration with the developers implementing urban density and allocation of important destinations. A last, but not least, objective for bus service development will be to improve punctuality and total travel time. Today a considerable proportion of city bus services are delayed in car traffic congestions. This is occurring especially on main streets and during rush hours. A set of different solutions are needed to address this question: 1. Dedicated bus streets (including car access to limited addresses) 2. Bus lines through local streets in concentrated housing, office and shopping areas. 3. Dedicated bus lane on main streets where possible. 4. Car traffic regulations on main streets without space for extra bus lane. As an overall vision, we need to cultivate the word of Flemming Larsen: urban growth as pearls on a string, as shown in fig. 13 and fig. 14.
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