Relevant bibliographies by topics / Space time codes

Academic literature on the topic 'Space time codes'

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Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Space time codes"

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Baro, S., G. Bauch, and A. Hansmann. "Improved codes for space-time trellis-coded modulation." IEEE Communications Letters 4, no. 1 (January 2000): 20–22. http://dx.doi.org/10.1109/4234.823537.

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Shehadeh, Mohannad, and Frank R. Kschischang. "Space–Time Codes From Sum-Rank Codes." IEEE Transactions on Information Theory 68, no. 3 (March 2022): 1614–37. http://dx.doi.org/10.1109/tit.2021.3129767.

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Lei, Guo Wei, Yuan An Liu, and Xue Fang Xiao. "Threaded Space Time Code Design for CPM with Joint Decoding." Applied Mechanics and Materials 631-632 (September 2014): 847–50. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.847.

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In the letter, a system of continuous phase modulation (CPM) with threaded space time codes (TSTC) is proposed for multiple-input multiple-output systems. In the system, source bits are coded via outer coder of Reed Solomon (RS). The codeword of which is suitable for TSTC design. Then inner coder mainly converts binary symbols into M-ary symbols for purpose of CPM. At receiver, Joint soft decoding approach is considered. Finally simulation results are provided for VBLAST, DBLAST, and TSTC as comparison.
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Lusina, P., E. Gabidulin, and M. Bossert. "Maximum rank distance codes as space~time codes." IEEE Transactions on Information Theory 49, no. 10 (October 2003): 2757–60. http://dx.doi.org/10.1109/tit.2003.818023.

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Kose, C., and R. D. Wesel. "Universal Space–Time Codes From Demultiplexed Trellis Codes." IEEE Transactions on Communications 54, no. 5 (May 2006): 955. http://dx.doi.org/10.1109/tcomm.2006.873972.

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Kose, C., and R. D. Wesel. "Universal space-time codes from demultiplexed trellis codes." IEEE Transactions on Communications 54, no. 7 (July 2006): 1243–50. http://dx.doi.org/10.1109/tcomm.2006.877967.

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Schlegel, C., and A. Grant. "Differential space-time turbo codes." IEEE Transactions on Information Theory 49, no. 9 (September 2003): 2298–306. http://dx.doi.org/10.1109/tit.2003.815818.

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Kose, C., and R. D. Wesel. "Universal space~time trellis codes." IEEE Transactions on Information Theory 49, no. 10 (October 2003): 2717–27. http://dx.doi.org/10.1109/tit.2003.817459.

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Oggier, F., G. Rekaya, J. C. Belfiore, and E. Viterbo. "Perfect Space–Time Block Codes." IEEE Transactions on Information Theory 52, no. 9 (September 2006): 3885–902. http://dx.doi.org/10.1109/tit.2006.880010.

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Terry, J. D., and J. T. Heiskala. "Spherical space-time codes (SSTC)." IEEE Communications Letters 5, no. 3 (March 2001): 107–9. http://dx.doi.org/10.1109/4234.913155.

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Dissertations / Theses on the topic "Space time codes"

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Karacayir, Murat. "Space-time Codes." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612028/index.pdf.

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The phenomenon of fading constitutes a fundamental problem in wireless communications. Researchers have proposed many methods to improve the reliability of communication over wireless channels in the presence of fading. Many studies on this topic have focused on diversity techniques. Transmit diversity is a common diversity type in which multiple antennas are employed at the transmitter. Space-time coding is a technique based on transmit diversity introduced by Tarokh et alii in 1998. In this thesis, various types of space-time codes are examined. Since they were originally introduced in the form of trellis codes, a major part is devoted to space-time trellis codes where the fundamental design criteria are established. Then, space-time block coding, which presents a different approach, is introduced and orthogonal spacetime block codes are analyzed in some detail. Lastly, rank codes from coding theory are studied and their relation to space-time coding are investigated.
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Pak, Anne On-Yi 1977. "Euclidean space codes as space-time block codes." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86722.

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Al-Ghadhban, Samir Naser. "Multi-layered Space Frequency Time Codes." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29498.

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This dissertation focuses on three major advances on multiple-input multiple-output (MIMO) systems. The first studies and compares decoding algorithms for multi-layered space time coded (MLSTC) systems. These are single user systems that combine spatial multiplexing and transmit diversity. Each layer consists of a space time code. The detection algorithms are based on multi-user detection theory. We consider joint, interference nulling and cancellation, and spatial sequence estimation algorithms. As part of joint detection algorithms, the sphere decoder is studied and its complexity is evaluated over MIMO channels. The second part contributes to the field of space frequency time (SFT) coding for MIMO-OFDM systems. It proposes a full spatial and frequency diversity codes at much lower number of trellis states. The third part proposes and compares uplink scheduling algorithms for multiuser systems with spatial multiplexing. Several scheduling criteria are examined and compared. The capacity and error rate study of MLSTBC reveals the performance of the detection algorithms and their advantage over other open loop MIMO schemes. The results show that the nulling and cancellation operations limit the diversity of the system to the first detected layer in serial algorithms. For parallel algorithms, the diversity of the system is dominated by the performance after parallel nulling. Theoretically, parallel cancellation should provide full receive diversity per layer but error propagations as a result of cancellation prevent the system from reaching this goal. However, parallel cancellation provides some gains but it doesn't increase the diversity. On the other hand, joint detection provides full receive diversity per layer. It could be practically implemented with sphere decoding which has a cubic complexity at high SNR. The results of the SFT coding show the superiority of the IQ-SFT codes over other codes at the same number of sates. The IQ-SFT codes achieve full spatial and frequency diversity at much lower number of trellis states compared to conventional codes. For V-BLAST scheduling, we propose V-BLAST capacity maximizing scheduler and we show that scheduling based on optimal MIMO capacity doesn't work well for V-BLAST. The results also show that maximum minimum singularvalue (MaxMinSV) scheduling performs very close to the V-BLAST capacity maximizing scheduler since it takes into account both the channel power and the orthogonality of the channel.
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Acharya, Om Nath, and Sabin Upadhyaya. "Space Time Coding For Wireless Communication." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19424.

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As the demand of high data rate is increasing, a lot of research is being conducted in the field of wireless communication. A well-known channel coding technique called Space-Time Coding has been implemented in the wireless Communication systems using multiple antennas to ensure the high speed communication as well as reliability by exploiting limited spectrum and maintaining the power. In this thesis, Space-Time Coding is discussed along with other related topics with special focus on Alamouti Space-Time Block Code. The Alamouti Codes show good performance in terms of bit error rate over Rayleigh fading channel. The performance of Altamonte’s code and MIMO capacity is evaluated by using MATLAB simulation.
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Panagos, Adam G., and Kurt Kosbar. "A METHOD FOR FINDING BETTER SPACE-TIME CODES FOR MIMO CHANNELS." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604782.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada
Multiple-input multiple output (MIMO) communication systems can have dramatically higher throughput than single-input, single-output systems. Unfortunately, it can be difficult to find the space-time codes these systems need to achieve their potential. Previously published results located good codes by minimizing the maximum correlation between transmitted signals. This paper shows how this min-max method may produce sub-optimal codes. A new method which sorts codes based on the union bound of pairwise error probabilities is presented. This new technique can identify superior MIMO codes, providing higher system throughput without increasing the transmitted power or bandwidth requirements.
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Gu, Yu. "Noncoherent communications using space-time trellis codes." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1252.

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In the last decade much interest has been shown in space-time trellis codes (STTCs) since they can offer coding gain along with the ability to exploit the space and time diversity of MIMO channels. STTCs can be flexibly designed by trading off performance versus complexity. The work of Dayal [1] stated that if training symbols are used together with data symbols, then a space-time code can be viewed as a noncoherent code. The authors of [1] described the migration from coherent space-time codes to training assisted noncoherent space-time codes. This work focuses on the development of training assisted noncoherent STTCs, thus extending the concept of noncoherent training codes to STTCs. We investigate the intrinsic link between coherent and noncoherent demod- ulation. By analyzing noncoherent STTCs for up to four transmit antennas, we see that they have similar performance deterioration to noncoherently demodulated M-PSK using a single antenna. Various simulations have been done to confirm the analysis.
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Rouchy, Christophe. "Systematic Design of Space-Time Convolutional Codes." Thesis, University of California, Santa Cruz, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1554232.

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Space-time convolutional code (STCC) is a technique that combines transmit diversity and coding to improve reliability in wireless fading channels. In this proposal, we demonstrate a systematic design of multi-level quadrature amplitude modulation (M-QAM) STCCs utilizing quadrature phase shift keying (QPSK) STCC as component codes for any number of transmit antennas. Morever, a low complexity decoding algorithm is introduced, where the decoding complexity increases linearly by the number of transmit antennas. The approach is based on utilizing a group interference cancellation technique also known as combined array processing (CAP) technique.

Finally, our research topic will explore: with the current approach, a scalable STTC with better performance as compared to space- time block code (STBC) combined with multiple trellis coded modulation (MTCM) also known as STBC-MTCM; the design of low complexity decoder for STTC; the combination of our approach with multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM).

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Siwamogsatham, Siwaruk. "Improved space-time codes for wireless communications /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486459267521456.

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Lamahewa, Tharaka Anuradha. "Space-time coding and space-time channel modelling for wireless communications /." View thesis entry in Australian Digital Theses Program, 2006. http://thesis.anu.edu.au/public/adt-ANU20070816.152647/index.html.

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Singhal, Rohit. "Multiple symbol decoding of differential space-time codes." Texas A&M University, 2003. http://hdl.handle.net/1969.1/344.

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Multiple-symbol detection of space-time differential codes (MS-STDC) decodes N consecutive space-time symbols using maximum likelihood (ML) sequence detection to gain in performance over the conventional differential detection scheme. However its computational complexity is exponential in N . A fast algorithm for implementing the MD-STDC in block-fading channels with complexity O(N 4) is developed. Its performance in both block-fading and symbol-by-symbol fading channels is demonstrated through simulations. Set partitioning in hierarchical trees (SPIHT) coupled with rate compatible punctured convolution code (RCPC) and cyclic redundancy check (CRC) is employed as a generalized multiple description source coder with robustness to channel errors. We propose a serial concatenation of the above with a differential space-time code (STDC) and invoke an iterative joint source channel decoding procedure for decoding differentially space-time coded multiple descriptions. Experiments show a gain of up to 5 dB in PSNR with four iterations for image transmission in the absence of channel state information (CSI) at the receiver. A serial concatenation of SPIHT + RCPC/CRC is also considered with space-time codes (STC) instead of STDC. Experiments show a gain of up to 7 dB with four iterations in the absence of CSI
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Books on the topic "Space time codes"

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

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Sellathurai, Mathini. Space-time layered information processing for wireless communications. Hoboken, N.J: Wiley, 2009.

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Oggier, Frédérique. Cyclic division algebras: A tool for space-time coding. Hanover, MA: Now Publishers, 2007.

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Masna, Rakesh. Performance comparison of V-Blast using ZF, MMSE and LSQR algorithms. [San Diego, California]: National University, 2009.

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Choy, Gary Ka-Chung. Comparative studies of space-time block codes and fading-resistant modulations in rayleigh fading channels. Ottawa: National Library of Canada, 2002.

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Duman, Tolga M. Coding for MIMO communication systems. Hoboken, NJ: J. Wiley & Sons, 2007.

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Prince, Maggie. Here comes a candle to light you to bed. London: Orion Children's, 1996.

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Rooyen, Pieter Van. Space-time processing for CDMA mobile communications. Boston: Kluwer Academic Publishers, 2000.

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1952-, Hanzo Lajos, and Hanzo Lajos 1952-, eds. Quadrature amplitude modulation: From basics to adaptive trellis-coded, turbo-equalised and space-time coded OFDM, CDMA and MC-CDMA systems. 2nd ed. Chichester: John Wiley & Sons, 2004.

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1952-, Hanzo Lajos, ed. Single-and multi-carrier DS-CDMA: Multi-user detection, space-time spreading, synchronisation, networking and standards. [Piscataway, N.J.]: IEEE Press, 2003.

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Book chapters on the topic "Space time codes"

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Su, Weifeng. "Space-Time Block Codes." In Encyclopedia of Wireless Networks, 1340–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-78262-1_142.

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Su, Weifeng. "Space-Time Block Codes." In Encyclopedia of Wireless Networks, 1–5. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-32903-1_142-1.

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Ahmed, Bannour, and Mohammad Abdul Matin. "Algebraic Space-Time (ST) Codes: An Overview." In Coding for MIMO-OFDM in Future Wireless Systems, 39–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19153-9_4.

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Höher, Peter Adam. "Diversitätsempfang, MIMO-Systeme und Space-Time-Codes." In Grundlagen der digitalen Informationsübertragung, 459–70. Wiesbaden: Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9927-9_22.

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Höher, Peter Adam. "Diversitätsempfang, MIMO-Systeme und Space-Time-Codes." In Grundlagen der digitalen Informationsübertragung, 605–24. Wiesbaden: Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-8348-2214-7_23.

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Barreal, Amaro, and Camilla Hollanti. "On Fast-Decodable Algebraic Space–Time Codes." In Number Theory Meets Wireless Communications, 99–141. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-61303-7_3.

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Barreal, Amaro, and Camilla Hollanti. "On Fast-Decodable Algebraic Space–Time Codes." In Number Theory Meets Wireless Communications, 99–141. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-61303-7_3.

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Liew, T. H., L. L. Yang, and L. Hanzo. "Redundant Residue Number System Codes." In Turbo Coding, Turbo Equalisation and Space-Time Coding, 257–316. Chichester, UK: John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/047085474x.ch8.

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Zhang, Jian-Kang, Jing Liu, and Kon Max Wong. "Trace-Orthogonal Full Diversity Cyclotomic Space-Time Codes." In Space-Time Processing for MIMO Communications, 169–208. Chichester, UK: John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470010045.ch5.

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Barreal, Amaro, Camilla Hollanti, and Nadya Markin. "Constructions of Fast-Decodable Distributed Space-Time Codes." In Coding Theory and Applications, 43–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17296-5_4.

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Conference papers on the topic "Space time codes"

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Bernier, David, and Francois Chan. "Convolutional Space-Time Codes." In 2006 Canadian Conference on Electrical and Computer Engineering. IEEE, 2006. http://dx.doi.org/10.1109/ccece.2006.277420.

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Damen, Mohamed Oussama, and Roger Hammons. "Distributed space-time codes." In the 2007 international conference. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1280940.1281016.

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Duyck, Dieter, Marc Moeneclaey, Sheng Yang, Fambirai Takawira, and Joseph J. Boutros. "Time-varying space-only codes." In 2012 IEEE International Symposium on Information Theory - ISIT. IEEE, 2012. http://dx.doi.org/10.1109/isit.2012.6284038.

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Janani, M., and A. Nosratinia. "Relaxed threaded space-time codes." In GLOBECOM '05. IEEE Global Telecommunications Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/glocom.2005.1578315.

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Young Seok Jung and Jac Hong Lee. "Geometrically uniform space-time codes." In IEEE International Symposium on Information Theory, 2003. Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/isit.2003.1228223.

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Henkel, Oliver. "CTH10-5: Space Time Codes from Permutation Codes." In IEEE Globecom 2006. IEEE, 2006. http://dx.doi.org/10.1109/glocom.2006.91.

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Mahesh, Anjana A., and B. Sundar Rajan. "Space Time Codes in Multi-Antenna Coded Caching Systems." In 2022 IEEE International Symposium on Information Theory (ISIT). IEEE, 2022. http://dx.doi.org/10.1109/isit50566.2022.9834484.

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Afghah, Fatemeh, Mehrdad Ardebilipour, and Abolfazl Razi. "Concatenation of space-time block codes and LDPC codes." In 2008 13th International Telecommunications Network Strategy and Planning Symposium (NETWORKS). IEEE, 2008. http://dx.doi.org/10.1109/netwks.2008.6231304.

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Razi, Abolfazl, Mehrdad Ardebilipour, and Fatemeh Afghah. "Space-Time Block Codes Assisted by Fast Turbo Codes." In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.347.

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Bernier, David, and Francois Chan. "Adaptive Space-Time Trellis Codes Based on Convolutional Codes." In IEEE Vehicular Technology Conference. IEEE, 2006. http://dx.doi.org/10.1109/vtcf.2006.82.

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Reports on the topic "Space time codes"

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Xia, Xiang-Gen. Low Complexity Receiver Based Space-Time Codes for Broadband Wireless Communications. Fort Belvoir, VA: Defense Technical Information Center, January 2011. http://dx.doi.org/10.21236/ada549377.

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Pincus, Robert. Flexible Radiation Codes for Numerical Weather Prediction Across Space and Time Scales. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada574101.

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Pincus, Robert. Flexible Radiation Codes for Numerical Weather Prediction Across Space and Time Scales. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada597696.

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Rice, Michael, M. S. Afran, and Mohammad Saquib. On the Application of Time-Reversed Space-Time Block Code to Aeronautical Telemetry. Fort Belvoir, VA: Defense Technical Information Center, June 2014. http://dx.doi.org/10.21236/ada623993.

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Yu, Weixiang, Gordon Richards, Peter Yoachim, and Christina Peters. A Metric for Differential Chromatic Refraction in the Context of the Legacy Survey of Space and Time. Github.com, 2020. http://dx.doi.org/10.17918/f5dn-8510.

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We provide a code repository for computing a metric to investigate how measurements of differential chromatic refraction might influence choices for survey strategy in the Rubin Observatory Legacy Survey of Space and Time.
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Yu, Weixiang, and Gordon T. Richards. LSSTC AGN Data Challenge 2021. GitHub, July 2021. http://dx.doi.org/10.17918/agn_datachallenge.

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We provide a code and data repository that can be used to facilitate planning for AGN science with the upcoming Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST). For this purpose, we have produced a common exploratory dataset that can be used to develop tools for parameterization of AGN light curves, AGN selection, and AGN photometric redshifts
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Adams, Elizabeth. Writing a Narrative CV. Edited by Sandra Oza. University of Dundee, December 2023. http://dx.doi.org/10.20933/100001295.

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This workbook guides you through reflective questions to help you with a narrative CV. What you write here will probably be much longer than the word or space limit that you will ultimately have in a grant or Fellowship application. It’s important that you read the call guidance each time. Think of this as your ‘master’ narrative CV document. When it comes to writing the one for the actual application, you will be pulling out the key bits of information which support you to demonstrate that you are the right person (or part of the right team), with a unique set of experiences, to be able to deliver the grant you are applying to. The examples here are written from an ECR or PGR perspective but every answer will be unique.
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Collins, Clarence O., and Tyler J. Hesser. altWIZ : A System for Satellite Radar Altimeter Evaluation of Modeled Wave Heights. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39699.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes the design and implementation of a wave model evaluation system, altWIZ, which uses wave height observations from operational satellite radar altimeters. The altWIZ system utilizes two recently released altimeter databases: Ribal and Young (2019) and European Space Agency Sea State Climate Change Initiative v.1.1 level 2 (Dodet et al. 2020). The system facilitates model evaluation against 1 Hz1 altimeter data or a product created by averaging altimeter data in space and time around model grid points. The system allows, for the first time, quantitative analysis of spatial model errors within the U.S. Army Corps of Engineers (USACE) Wave Information Study (WIS) 30+ year hindcast for coastal United States. The system is demonstrated on the WIS 2017 Atlantic hindcast, using a 1/2° basin scale grid and a 1/4° regional grid of the East Coast. Consistent spatial patterns of increased bias and root-mean-square-error are exposed. Seasonal strengthening and weakening of these spatial patterns are found, related to the seasonal variation of wave energy. Some model errors correspond to areas known for high currents, and thus wave-current interaction. In conjunction with the model comparison, additional functions for pairing altimeter measurements with buoy data and storm tracks have been built. Appendices give information on the code access (Appendix I), organization and files (Appendix II), example usage (Appendix III), and demonstrating options (Appendix IV).
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Perdigão, Rui A. P. New Horizons of Predictability in Complex Dynamical Systems: From Fundamental Physics to Climate and Society. Meteoceanics, October 2021. http://dx.doi.org/10.46337/211021.

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Discerning the dynamics of complex systems in a mathematically rigorous and physically consistent manner is as fascinating as intimidating of a challenge, stirring deeply and intrinsically with the most fundamental Physics, while at the same time percolating through the deepest meanders of quotidian life. The socio-natural coevolution in climate dynamics is an example of that, exhibiting a striking articulation between governing principles and free will, in a stochastic-dynamic resonance that goes way beyond a reductionist dichotomy between cosmos and chaos. Subjacent to the conceptual and operational interdisciplinarity of that challenge, lies the simple formal elegance of a lingua franca for communication with Nature. This emerges from the innermost mathematical core of the Physics of Coevolutionary Complex Systems, articulating the wealth of insights and flavours from frontier natural, social and technical sciences in a coherent, integrated manner. Communicating thus with Nature, we equip ourselves with formal tools to better appreciate and discern complexity, by deciphering a synergistic codex underlying its emergence and dynamics. Thereby opening new pathways to see the “invisible” and predict the “unpredictable” – including relative to emergent non-recurrent phenomena such as irreversible transformations and extreme geophysical events in a changing climate. Frontier advances will be shared pertaining a dynamic that translates not only the formal, aesthetical and functional beauty of the Physics of Coevolutionary Complex Systems, but also enables and capacitates the analysis, modelling and decision support in crucial matters for the environment and society. By taking our emerging Physics in an optic of operational empowerment, some of our pioneering advances will be addressed such as the intelligence system Earth System Dynamic Intelligence and the Meteoceanics QITES Constellation, at the interface between frontier non-linear dynamics and emerging quantum technologies, to take the pulse of our planet, including in the detection and early warning of extreme geophysical events from Space.
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Ningthoujam, J., J. K. Clark, T. R. Carter, and H. A. J. Russell. Investigating borehole-density, sonic, and neutron logs for mapping regional porosity variation in the Silurian Lockport Group and Salina Group A-1 Carbonate Unit, Ontario. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332336.

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Abstract:
The Oil, Gas and Salt Resources Library (OGSRL) is a repository for data from wells licenced under the Oil, Gas and Salt Resources Act for Ontario. It has approximately 50,000 porosity and permeability drill core analyses on bedrock cores. It also has in analogue format, geophysical logs (e.g., gamma ray, gamma-gamma density, neutron, sonic) from approximately 20,000 wells. A significant challenge for geotechnical and hydrogeological studies of the region is the accessibility of digital data on porosity and permeability. Recent work completed on approximately 12,000 core analyses for the Silurian Lockport Group and Salina Group A-1 Carbonate Unit are geographically concentrated within productive oil and gas pools. An opportunity therefore exists to expand the bedrock porosity characterization for southern Ontario by using geophysical logs collected in open-hole bedrock wells that are more geographically dispersed. As part of this study, hard copy files of analog geophysical logs are converted to digital data (LAS format), followed by quality assessment and quality control (QAQC) to obtain meaningful results. From the digitized geophysical data, density, neutron, and sonic logs are selected to mathematically derive porosity values that are then compared with the corresponding measured core porosity values for the same depth interval to determine the reliability of the respective log types. In this study, a strong positive correlation (R²=0.589) is observed between porosity computed from a density log (density log porosity) and the corresponding core porosity. Conversely, sonic log porosity and neutron porosity show weak (R2 = 0.1738) and very weak (R2 = 0.0574) positive correlation with the corresponding core porosity data. This finding can be attributed to different factors (e.g., the condition of the borehole walls and fluids, the type and limitations of the technology at different points in time, knowledge of formation variability for calculations), and as such requires more investigation. The density log measures the bulk density of the formation (solid and fluid phases), and as such the derived porosity values indicate total porosity i.e., interparticle (primary) pore spaces, and vugs and fractures (secondary) pore spaces. The sonic log measures the interval transit time of a compressional soundwave travelling through the formation. High quality first arrival waveforms usually correspond to a route in the borehole wall free of fractures and vugs, which ultimately result in the derived porosity reflecting only primary porosity. As molds, vugs and fractures contribute significantly to the total porosity of the Lockport Group and Salina A-1 Carbonate strata, sonic porosity may not reflect true bulk formation porosity. The neutron porosity log measures the hydrogen index in a formation as a proxy for porosity, however, the current limitations of neutron logging tool fail to account for formation-related complexities including: the gas effect, the chloride effect and the shale effect that can lead to over- or underestimation of formation porosity. As a result, the density log appears to be the most reliable geophysical log in the OGSRL archives for total porosity estimation in the Lockport Group and Salina A-1 Carbonate Unit. Nonetheless, sonic porosity can be combined with density porosity to determine secondary porosity, whereas a combination of density and neutron porosity logs can be used to identify gas-bearing zones.
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