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Artykuły w czasopismach na temat „Multipath interference”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 12 lutego 2022

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1

Suppayasarn, Atikom, Sarun Duangsuwan i Sathaporn Promwong. "Indoor Multipath Interference Cancellation Using MMSE-CMA Estimator with 2.45 GHz of MIMO Channel Measurement". Applied Mechanics and Materials 781 (sierpień 2015): 89–92. http://dx.doi.org/10.4028/www.scientific.net/amm.781.89.

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This paper studies an indoor multipath interference cancellation using the MMSE-CMA estimator for the unlicensed at 2.45 GHz of wireless communication systems. The proposed of the MMSE-CMA estimator can mitigate a superposition of the multipath interference at the receiver. As the result, the magnitudes of the channel characterization in the time domain are shown between the measured and estimated channel as a difference of number of iterations. Furthermore, we also confirm the multipath interference cancellation with the eye diagrams.

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2

Wang, Manyi, Zhonglei Wang, Xiongzhu Bu i Enjie Ding. "An adaptive weighting algorithm for accurate radio tomographic image in the environment with multipath and WiFi interference". International Journal of Distributed Sensor Networks 13, nr 1 (styczeń 2017): 155014771668382. http://dx.doi.org/10.1177/1550147716683826.

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Radio frequency device-free localization based on wireless sensor network has proved its feasibility in buildings. With this technique, a target can be located relying on the changes of received signal strengths caused by the moving object. However, the accuracy of many such systems deteriorates seriously in the environment with WiFi and the multipath interference. State-of-the-art methods do not efficiently solve the WiFi and multipath interference problems at the same time. In this article, we propose and evaluate an adaptive weighting radio tomography image algorithm to improve the accuracy of radio frequency device-free localization in the environment with multipath and different intensity of WiFi interference. Field experiments prove that our approach outperforms the state-of-the-art radio frequency device-free localization systems in the environment with multipath and WiFi interference.

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3

Du, Pengyu, Lujun Wang, Hongtao Zhang i Zhe Xie. "Performance analysis of direct-sequence spread-spectrum underwater acoustic communications based on at-sea data". MATEC Web of Conferences 283 (2019): 07006. http://dx.doi.org/10.1051/matecconf/201928307006.

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Direct sequence spread spectrum (DSSS) signal uses phase coherent signals where the information symbols are multiplied with a code sequence, commonly known as chips. The signals are processed at the receiver using the code sequence as a matched filter to extract the information symbols. Taking advantage of the spread processing gain derived from the matched filter, communications can be carried out at low signal levels, which is the preferred method for high quality underwater acoustic (UWA) communication and remote UWA communication. However, in practical applications, DSSS UWA communication will face lots of interferences including multipath interference, Doppler compression interference and phase fluctuation interference, which will seriously affect the performance of DSSS. This paper first analyzes the interferences that DSSS faces in practical applications based on multiple actual received data collected in different water areas. By calculating the gain of the matched filter loss, one can find that influence of phase fluctuation interference has the most serious impact on DSSS. Secondly, the corresponding receiver processing algorithms are given for these interferences, including the differential energy detector and Doppler estimation method. The performance of differential energy detector under the above interferences is analyzed, which shows that the differential energy detector is insensitive to slow phase fluctuation interference and multipath interference and the differential energy detector combined with Doppler compensation can work well based on moving at-sea data. Finally, the parameter design of DSSS system in practical application is discussed and parameter design of DSSS UWA communication system should comprehensively consider the Doppler compression interference and phase fluctuation interference.

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4

Alabi, Oluwaseun Yinka, i Michael Kolawole. "Mitigating the Effects of Intereference in a Multipath Prone Environment for a DVB-T Transmission". International Journal of Informatics and Communication Technology (IJ-ICT) 4, nr 2 (1.08.2015): 86. http://dx.doi.org/10.11591/ijict.v4i2.pp86-89.

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This paper develops a novel simulation method that seeks to mitigate the effects of interference in a multipath prone environment for a DVB-T transmission by using the AWGN and the Multipath Rayleigh Fading Channel. The channel parameters were optimized until desired result was obtained. The reception performance of the DVB-T system shows that interference though not totally eliminated, can be minimized while transmitting in a multipath prone environment.

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5

Xie, Zhuang, Chongyi Fan, Jiahua Zhu i Xiaotao Huang. "Doubly Covariance Matrix Reconstruction Based Blind Beamforming for Coherent Signals". Sensors 20, nr 12 (25.06.2020): 3595. http://dx.doi.org/10.3390/s20123595.

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This paper proposes a beamforming method in the presence of coherent multipath arrivals at the array. The proposed method avoids the prior knowledge or estimation of the directions of arrival (DOAs) of the direct path signal and the multipath signals. The interferences are divided into two groups based on their powers and the interference-plus-noise covariance matrix (INCM) is reconstructed through the doubly covariance matrix reconstruction concept. The composite steering vector (CSV) that accounts for the direct path signal and multipath signals is estimated as the principal eigenvector of the sample covariance matrix with interferences and noise removed. The optimal weight vector is finally computed using the INCM and the CSV. The proposed method involves no spatial smoothing and avoids reduction in the degree of freedom. Simulation results demonstrate the improved performance of the proposed method.

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6

Staniec, Kamil, i Michał Kowal. "LoRa Performance under Variable Interference and Heavy-Multipath Conditions". Wireless Communications and Mobile Computing 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/6931083.

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LoRa (or LoRaWAN) is by far the best known representative of narrowband communication systems designed for the Internet of Things. As a system dedicated specifically for long-range operations, it possesses a considerable processing gain for the energetic link budget improvement and a remarkable immunity to multipath and interference. The paper describes outcomes of measurement campaigns during which the LoRa performance was tested against these two factors, that is, a heavy-multipath propagation and a controlled, variable interference generated, respectively, in a reverberation chamber and an anechoic chamber. Results allow quantitative appraisal of the system behavior under these harsh conditions with respect to LoRa’s three major configurable parameters: the spreading factor, bandwidth, and code rate. They also allow dividing LoRa configurational space into three distinct sensitivity regions: in the white region it is immune to both interference and multipath propagation, in the light-grey region it is only immune to the multipath phenomenon but sensitive to interference, and in the dark grey region LoRa is vulnerable to both phenomena.

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7

Xie, Tuo, Hanjun Jiang, Xijin Zhao i Chun Zhang. "A Wi-Fi-Based Wireless Indoor Position Sensing System with Multipath Interference Mitigation". Sensors 19, nr 18 (14.09.2019): 3983. http://dx.doi.org/10.3390/s19183983.

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Wi-Fi-based indoor position sensing solutions have the advantages of easy integration in mobile phones and low cost by using existing Wi-Fi access points. The mainstream methods are commonly based on the received signal strength indicator (RSSI), which suffers from multipath interference in complicated indoor environments. Through the in-depth analysis of the multipath interference, an RSSI-assisted time difference of arrival (TDoA) method is proposed for Wi-Fi-based indoor position sensing in this work. The key idea is to compensate for the multipath interference in the received signals based on the coarse estimation using RSSI and TDoA calculation. A prototype system has been implemented to validate the proposed method. Experimental results have demonstrated the effectiveness of the proposed method, especially for handling the multipath interference with small propagation delay difference. Experimental results show that the indoor position sensing system can achieve a 90th percentile error of 0.3 m. The proposed method can also achieve moderate computational complexity and moderate real-time performance compared to other methods.

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8

Maimour, Moufida. "Interference-aware multipath routing for WSNs: overview and performance evaluation". Applied Computing and Informatics 16, nr 1/2 (15.03.2018): 59–80. http://dx.doi.org/10.1016/j.aci.2018.03.002.

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Multipath routing holds a great potential to provide sufficient bandwidth to a plethora of applications in wireless sensor networks. In this paper, we consider the problem of interference that can significantly affect the expected performances. We focus on the performance evaluation of the iterative paths discovery approach as opposed to the traditional concurrent multipath routing. Five different variants of multipath protocols are simulated and evaluated using different performance metrics. We mainly show that the iterative approach allows better performances when used jointly with an interference-aware metric or when an interference-zone marking strategy is employed. This latter appears to exhibit the best performances in terms of success ratio, achieved throughput, control messages overhead as well as energy consumption.

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9

Li, Rong. "Digital Modulation Recognition in Different Environments". Advanced Materials Research 1049-1050 (październik 2014): 2084–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.2084.

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For the using of multi-modulation, the precondition of receiving and demodulating signal is to determine the type of the modulation, so automatic recognition of modulation signal has significant influence on the analysis of the signals. In this paper, digital modulation recognition is studied respectively in different environment of White Gaussian Noise (WGN), stationary interference and multipath interference. The simulation results show that the recognition success rate is the highest in stationary interference environment and the lowest in multipath interference environment with the same signal to noise ratio (SNR).

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10

Obšil, P., A. Lešundák, T. Pham, G. Araneda, M. Čížek, O. Číp, R. Filip i L. Slodička. "Multipath interference from large trapped ion chains". New Journal of Physics 21, nr 9 (19.09.2019): 093039. http://dx.doi.org/10.1088/1367-2630/ab4081.

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11

Woodward, S. L., i T. E. Darcie. "A method for reducing multipath interference noise". IEEE Photonics Technology Letters 6, nr 3 (marzec 1994): 450–52. http://dx.doi.org/10.1109/68.275515.

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12

Boivin, D., L. A. de Montmorillon, L. Provost i P. Sillard. "Coherent Multipath Interference in Bend-Insensitive Fibers". IEEE Photonics Technology Letters 21, nr 24 (grudzień 2009): 1891–93. http://dx.doi.org/10.1109/lpt.2009.2035095.

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13

Jia, Qiongqiong, Renbiao Wu, Wenyi Wang, Dan Lu, Lu Wang i Jie Li. "Multipath interference mitigation in GNSS via WRELAX". GPS Solutions 21, nr 2 (3.05.2016): 487–98. http://dx.doi.org/10.1007/s10291-016-0538-9.

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14

She, Feng, Hsiao Hwa Chen i Hongyang Li. "Joint Angular and Time Diversity of Multi-Antenna CDMA Systems in Wireless Fading Channels". International Journal of Wireless Networks and Broadband Technologies 1, nr 1 (styczeń 2011): 1–14. http://dx.doi.org/10.4018/ijwnbt.2011010101.

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In this paper, a multi-antenna based receiver structure for direct sequence code division multiple access (DS/CDMA) system is proposed. The proposed scheme exploits the excellent time resolution of a CDMA RAKE receiver and uses an antenna array beamforming structure to resolve multipath returns in both angular and time domains. A much higher diversity gain than that based only on the time domain diversity can be achieved. This work suggests a new space-time diversity paradigm, namely angular-time diversity, which differs from traditional Alamouti-type space-time coded schemes. The impairments caused by multipath and multiuser interference are analyzed. The performance of the proposed receiver in multipath fading channel is explicitly evaluated. An expression for uncoded system bit error probability is derived. Simulation results show the performance improvement in terms of BER due to the use of multi-antenna in the receiver, and the results illustrate that the multi-antenna based receiver works effectively in resolving multipaths in both angular and time domains to achieve performance improvement due to angular and time diversity gain provided by the multi-antenna system.

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15

Maimour, Moufida. "Interference-aware metrics impact on the performance of incremental multipath routing in WSNs". Journal of High Speed Networks 26, nr 3 (27.11.2020): 225–40. http://dx.doi.org/10.3233/jhs-200640.

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Multipath routing has been considered in the literature to provide bandwidth aggregation for high data rate applications. Because of the phenomena of inter-path interference in wireless networks, the overall throughput is far from being the summation of the provided ones by the different paths individually. One promising solution to this problem is to make use of interference aware metrics to build multiple paths such that the inter-path interference is minimised. In this work, we are interested in assessing the impact of a set of interference aware metrics on the performance of incremental multipath routing in Wireless Sensor Networks (WSN). Incremental multipath routing builds one path per request/reply session and hence is more suitable to be combined to interference aware metrics. We review, implement and evaluate both active and passive monitoring metrics and show that for constrained networks such as WSNs, the latter are more adapted. Additionally, we show that within the passive monitoring metrics, the best one is not necessarily the most expensive to measure.

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16

Zhou, Liu, Nie, Yang, Zhang i Ma. "M-ary Cyclic Shift Keying Spread Spectrum Underwater Acoustic Communications Based on Virtual Time-Reversal Mirror". Sensors 19, nr 16 (16.08.2019): 3577. http://dx.doi.org/10.3390/s19163577.

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Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on. Spread spectrum technique thus has been widely used in underwater acoustic communications for its strong anti-interference ability and good confidentiality. Underwater acoustic channels are typical coherent multipath channels, in which the inter-symbol interference seriously affects the performance of underwater acoustic communications. Time-reversal mirror technique utilizes this physical characteristic of underwater acoustic channels to restrain the inter-symbol interference by reconstructing multipath signals and reduce the influence of channel fading by spatial focusing. This paper presents an M-ary cyclic shift keying spread spectrum underwater acoustic communication scheme based on the virtual time-reversal mirror. Compared to the traditional spread spectrum techniques, this method is more robust, for it uses the M-ary cyclic shift keying spread spectrum to improve the communication rate and uses the virtual time-reversal mirror to ensure a low bit error rate. The performance of this method is verified by simulations and pool experiments.

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17

Bai, Zhiquan, Fang Zhao, Changhui Wang i Cheng-Xiang Wang. "Multiple access interference and multipath interference analysis of orthogonal complementary code-based ultra-wideband systems over multipath channels". International Journal of Communication Systems 27, nr 12 (7.10.2013): 4430–42. http://dx.doi.org/10.1002/dac.2623.

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18

Meng, Ling Jing, Dong Li i Hai Bo Liu. "Impact of Multipath Effect on Low-Altitude Elevation Measurement of Radar". Applied Mechanics and Materials 602-605 (sierpień 2014): 1879–82. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1879.

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The main impact of multipath effect on low-altitude radar measurement is elevated in this paper. The influence of multipath effect on monopulse radar measurement of elevation is analyzed. Examples suggest that the multipath error caused by the signals from pattern main lobe of radar antenna should be mainly considered in the actual project. According to the three elevation range of reflected signal entering the radar beam area, the multipath error model of elevation is established. The problem of anti-multipath interference for low-altitude target tracking with radar is solved by analyzing the error source which causes multipath effect.

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19

Zhang, Ping Hua, Xiu Liang Huang i Zhong Yue He. "Research of Anti-Multipath Interference Capability in Direct Sequence Spread Spectrum Communication System by Simulation". Advanced Materials Research 846-847 (listopad 2013): 592–95. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.592.

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The effects of multipath fading with time delay longer or shorter than one chip interval on DSSS system are mathematically and experimentally researched. Simulation results indicate that DSSS system can efficiently overcome multipath fading in multipath Rayleigh Fading channels. And the spreading gain is not the higher the better, it must be chosen reasonably.

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20

Yu, Xin. "Design and Optimization on Train-Ground Wireless Communication of Passenger Information System of Urban Rail Transit". Applied Mechanics and Materials 236-237 (listopad 2012): 964–69. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.964.

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This paper briefly introduces train-ground wireless communication technology of Urban Rail passenger information system. Analysis several kinds of external interference in train-ground wireless communication engineering application: Same frequency interference, multipath interference and other electromagnetic interference. Proposes the anti interference measures. Proposes design principle and deployment solution of wireless access points.

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21

Zhu, Yu Hao, i Chong Shen. "Performance Verification of MIMO Technology in WLAN System and Diversity Gain Issue". Applied Mechanics and Materials 716-717 (grudzień 2014): 1425–29. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1425.

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Wireless signal reflecting, scattering or refracting causes the generation of multipath effects. Multipath causes multiple copies of the same wireless signal, These copies to different path to reach the receiver. The signal generated by a copy of the same produce serious interference. MIMO (Multiple-Input Multiple-Output) technology can make the interference caused by the multipath significantly reduced. In this paper, in the context of indoor and outdoor, through TP-LINK-WR845N (MIMO 2*2, which have 2 launching antennas and 2 receiving antennas) to verify the superior performance of this technology under indoor condition, at the same time we discover that the MIMO technology does not increase the coverage under outdoor condition, because there is only the power gain, no diversity gain.

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22

Cheng, Li, Yang Li, Lianying Zou i Yong Qin. "DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs". International Journal of Antennas and Propagation 2019 (13.10.2019): 1–10. http://dx.doi.org/10.1155/2019/2837315.

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In a typical multipath propagation environment, there exists a strong direct path signal accompanying with several weak multipath signals. Due to the strong direct path interference and other masking effects, the Direction-of-Arrival (DOA) of a weak multipath signal is hard to be estimated. In this paper, a novel method is proposed to estimate the DOA of multipath signals with ultralow signal-to-noise ratio (SNR). The main idea is to increase the SNR and signal-to-interference ratio (SIR) of the desired multipath signal in time-delay domain before DOA estimation processing. Firstly, the cross-correlation functions of the direct path signal and the received array signal are calculated. Then, they are combined and constructed to an enhanced array signal. Under certain conditions, the SNR and SIR of the desired signal can be significantly increased. Finally, the DOAs of multipath signals can be estimated by conventional technologies, and the associated time delays can be measured on the DOA-time-shift map. The SNR and SIR gains of the desired signal are analyzed theoretically, and theoretical analysis also indicates that the Cramer–Rao bound can be reduced. Simulation examples are presented to verify the advantages of the proposed method.

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23

Kostyria, O., V. Storozhenko i V. Naumenko. "Compensation of Multipath Interference in a Separated Passive Time and Frequency Synchronization Systems". Metrology and instruments, nr 4 (7.09.2019): 17–23. http://dx.doi.org/10.33955/2307-2180(4)2019.17-23.

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Multipath propagation of radio waves negatively affects to the performance of telecommunications and radio navigation systems [1, 3]. When performing time and frequency synchronization tasks of spatially separated standards, the multipath signal propagation aggravates the probability of a correct synchronization and introduces an error. The presence of a multipath signal reduces the signal-to-noise ratio in the received signal, which in turn causes an increase in the synchronization error. The mathematical models of multipath interference suppression in the time and in the frequency domain are presented in the article. Compared to time processing, processing in the frequency domain reduces computational costs. The operation of suppression in the time domain has been verified experimentally.

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24

Eslami, Mohammed, i Howard I. Bassen. "A Compact Test System for Simulating Multipath Interference". Open Journal of Antennas and Propagation 02, nr 02 (2014): 9–20. http://dx.doi.org/10.4236/ojapr.2014.22002.

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25

Kamatham, Yedukondalu. "Prediction of Multipath Interference for Static GNSS Applications". CVR Journal of Science & Technology 14, nr 01 (1.06.2018): 1–5. http://dx.doi.org/10.32377/cvrjst1401.

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26

Parveen, Nazia. "Multipath Interference Cancellation in MIMO Mobile Cellular system". International Journal of Distributed and Parallel systems 3, nr 3 (31.05.2012): 35–48. http://dx.doi.org/10.5121/ijdps.2012.3305.

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27

Cotter, Joseph P., Christian Brand, Christian Knobloch, Yigal Lilach, Ori Cheshnovsky i Markus Arndt. "In search of multipath interference using large molecules". Science Advances 3, nr 8 (sierpień 2017): e1602478. http://dx.doi.org/10.1126/sciadv.1602478.

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28

Tian, Gui Long, Chuang Ming Tong, Hao Liu, Zheng Guo Long i Jiang Jun Wang. "Anti-multipath interference method of semi-active seek". Journal of Engineering 2019, nr 21 (1.11.2019): 7507–11. http://dx.doi.org/10.1049/joe.2019.0482.

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29

Aliyu, Ahmed, Abdul Hanan Abdullah, Nauman Aslam, Ayman Altameem, Raja Zahilah Radzi, Rupak Kharel, Mufti Mahmud, Shiv Prakash i Usman Mohammed Joda. "Interference-Aware Multipath Video Streaming in Vehicular Environments". IEEE Access 6 (2018): 47610–26. http://dx.doi.org/10.1109/access.2018.2854784.

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30

Kaitsuka, Toshiyuki. "Criteria of the possibility of multipath interference cancellation". Electronics and Communications in Japan (Part I: Communications) 76, nr 1 (1993): 104–15. http://dx.doi.org/10.1002/ecja.4410760110.

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Morgan, D., i A. Aridgides. "Adaptive sidelobe cancellation of wide-band multipath interference". IEEE Transactions on Antennas and Propagation 33, nr 8 (sierpień 1985): 908–17. http://dx.doi.org/10.1109/tap.1985.1143681.

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32

Visentin, Tristan, Jürgen Hasch i Thomas Zwick. "Analysis of multipath and DOA detection using a fully polarimetric automotive radar". International Journal of Microwave and Wireless Technologies 10, nr 5-6 (3.04.2018): 570–77. http://dx.doi.org/10.1017/s1759078718000284.

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AbstractMultipath propagation occurs in many situations of radar measurements in complex environments. The unwanted effects range from interference over the radar channels, which causes amplitude fading and a corrupted direction of arrival (DOA) estimation, to the detection of ghost targets in an angle of arrival of the multipath direction. Due to the different number of reflections, polarimetric radars are capable to separate certain multipaths from direct paths if the target is known in advance. Furthermore, it is possible to separate objects with different polarimetric features in DOA that are located in the same radial distance to the radar. In this paper, a new approach to DOA detection based on the coherent Pauli decomposition is presented. With this approach, important multipath and DOA effects are analyzed and measurement results at 77 GHz on canonical objects in an anechoic chamber are presented. The results prove the feasibility of the approach and demonstrate the occurring effects.

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33

Yu, Xiao Lei, Yin Shan Yu, Yu Yu Ji i Dong Hua Wang. "Communication Performance of RFID System and Anti-Interference in the Multipath Rayleigh Fading Channel". Applied Mechanics and Materials 239-240 (grudzień 2012): 1022–26. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1022.

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With the communication environment of RFID system developing from near field communication to long distance communication, Rayleigh fading with Doppler frequency shift emerges from multipath effect between the readers and electronic tags. A systemic study was focused on modeling and analysis of channel transmission for Type A tag signals in the multipath Rayleigh fading channel. Furthermore, the OFDM system was added to the RFID tag signals to improve the sensitivity of SNR in the Rayleigh fading channel. The SNR of tag signal is not sensitive in the multipath Rayleigh fading channel. However, the sensitivity increases after OFDM is added to the RFID system and the anti-interference ability is highly improved.

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34

Yuan, Yue, Feng Shen i Dingjie Xu. "Multipath modeling and mitigation by using sparse estimation in global navigation satellite system-challenged urban vehicular environments". International Journal of Advanced Robotic Systems 17, nr 5 (1.09.2020): 172988142096869. http://dx.doi.org/10.1177/1729881420968696.

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Multipath interference has been one of the most difficult problems when using global navigation satellite system-based vehicular navigation in urban environments. In this article, we develop a multipath mitigation algorithm exploiting the sparse estimation theory that improves the absolute positioning accuracy in urban environments. The navigation observation model is established by considering the multipath bias as additive positioning errors, and the assumption for the proposed method is that global navigation satellite system signals contaminated due to multipath are the minority among the received signals, which makes the unknown bias vector sparse. We investigated an improved elastic net method to estimate the sparse multipath bias vector, and the global navigation satellite system measurements can be corrected by subtracting the estimated multipath error. The positioning performance of the proposed method is verified by analytical and experimental results.

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35

Yoshizawa, Shingo. "Underwater Acoustic Localization Based on IR-GCC-PHAT in Reverberant Environments". International Journal of Circuits, Systems and Signal Processing 15 (12.03.2021): 164–71. http://dx.doi.org/10.46300/9106.2021.15.18.

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This paper presents a method of underwater acoustic localization in reverberant environments. Time difference of arrival (TDOA) measurement algorithm is a key technology for estimating direction of arrival (DOA) of an underwater sound source. In strong multipath interference, the pseudo-peaks in a correlation function disturb the detection of a correct time position and lead to a large TDOA measurement error. The proposed algorithm computes a time difference by taking cross-correlation of two impulse responses and improves robustness to multipath interference. The comparison of TDOA algorithms is done by evaluating the position accuracy of underwater sound source in both simulation and experiment.

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36

Wang, Yiwei, i Zhigang Huang. "MEDLL On-Strobe Correlator: A Combined Anti-multipath Technique for GNSS Signal Tracking". Journal of Navigation 73, nr 3 (11.11.2019): 658–77. http://dx.doi.org/10.1017/s0373463319000870.

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To reduce the operational complexity of the multipath estimating delay lock loop (MEDLL) and improve its anti-multipath performance for strobe correlators, a combination anti-multipath scheme, namely, the MEDLL on-strobe correlation technique, is proposed for global navigation satellite system (GNSS) signal processing. Short-delay multipath rays are separated from the strobe correlation function by the MEDLL mechanism; the dot product between the estimation residue and the standard correlation function or the BOC-PRN correlation function is then computed to eliminate the potential tracking ambiguity. Finally, this non-coherent combination result is sent to the loop filter to obtain anti-multipath code tracking. The proposed method is analysed via simulator data with a software receiver under different front-end bandwidth conditions. The results corroborate the better multipath mitigation capability and lower computational burden, although it is still difficult to eliminate all multipath interference, especially when the front-end bandwidth is insufficient.

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Bakkar, Mohammad. "Inner-symbol Interference (INSI) reduction in OFDM system using distinctive characteristics of the pilot symbols". Association of Arab Universities Journal of Engineering Sciences 27, nr 1 (31.03.2020): 122–29. http://dx.doi.org/10.33261/jaaru.2019.27.1.013.

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This research presents a wireless communication system using Quadrature Amplitude Modulation (16QAM) depending on using of the Orthogonal Frequency Division Multiplexing (OFDM). OFDM transmission system can effectively reduce inter symbol interference (ISI) caused by multipath fading, especially in the case of broadband data transmission. There are two kind of interference; inter symbol interference (ITSI) and inner symbol interference (INSI). ITSI is the interference caused by the delayed waves with larger than OFDM symbol duration, in order to avoid ITSI effectively, we insert guard interval every each OFDM symbol. On other hands, INSI is the interference caused by the delayed waves with less than OFDM symbol duration. To avoid INSI, this work proposes a new scheme in order to estimate the times of delayed waves by using distinctive characteristics of OFDM signal, which is inserted pilot signal periodically in frequency axis before IFFT at the transmitter. In this paper, we evaluate the estimation accuracy of the proposed estimation method and the BER performance of the proposed system under multipath fading environment by computer simulation with MATLAB.

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Ouyang, Yuan, Wen-Piao Lin i Chuan-Chih Liu. "Performance Analysis of the Multiband Orthogonal Frequency Division Multiplexing Ultra-Wideband Systems for Multipath Fading and Multiuser Interference Channels". Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/190809.

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This paper presents the performance analysis of the multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) systems for multipath fading and multiuser interference channels. A closed form approximation of the BER performance of the MB-OFDM UWB system with multiple interferences is proposed. Based on the derived approximation, the effects on the BER performance for the choice of the codeword constraint lengths of the convolutional encoder, the length of the cyclic prefix, and the multiuser environments of two or more interferers are thoroughly discussed. Four UWB multipath fading channels are also investigated for the BER performance of the MB-OFDM UWB system. The simulated results provide us with useful information to appropriately choose the parameters of the MB-OFDM UWB system for the sake of achieving the BER performance that conforms to requirement of the FCC standards.

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Cheng, Cheng, i Jean-Yves Tourneret. "An EM-based multipath interference mitigation in GNSS receivers". Signal Processing 162 (wrzesień 2019): 141–52. http://dx.doi.org/10.1016/j.sigpro.2019.04.018.

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Liu, Xiqing, Hsiao-Hwa Chen, Weixiao Meng i Bo-Yu Lyu. "Successive Multipath Interference Cancellation for CP-Free OFDM Systems". IEEE Systems Journal 13, nr 2 (czerwiec 2019): 1125–34. http://dx.doi.org/10.1109/jsyst.2018.2838663.

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Zhou, Hong, Susumu Yoshida i Fumio Ikegami. "Detection of multipath signal by cross-channe-interference measurement". Electronics and Communications in Japan (Part I: Communications) 74, nr 2 (luty 1991): 55–66. http://dx.doi.org/10.1002/ecja.4410740207.

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Liu, Derong, i Hossein Zare. "A multipath interference cancellation technique for WCDMA downlink receivers". International Journal of Communication Systems 20, nr 6 (2007): 661–68. http://dx.doi.org/10.1002/dac.841.

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Fludger, C. R. S., i R. J. Mears. "Electrical measurements of multipath interference in distributed Raman amplifiers". Journal of Lightwave Technology 19, nr 4 (kwiecień 2001): 536–45. http://dx.doi.org/10.1109/50.920852.

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Feigin, Micha, Ayush Bhandari, Shahram Izadi, Christoph Rhemann, Mirko Schmidt i Ramesh Raskar. "Resolving Multipath Interference in Kinect: An Inverse Problem Approach". IEEE Sensors Journal 16, nr 10 (maj 2016): 3419–27. http://dx.doi.org/10.1109/jsen.2015.2421360.

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Ramachandran, S., J. W. Nicholson, S. Ghalmi i M. F. Yan. "Measurement of multipath interference in the coherent crosstalk regime". IEEE Photonics Technology Letters 15, nr 8 (sierpień 2003): 1171–73. http://dx.doi.org/10.1109/lpt.2003.814880.

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Ramachandran, S., S. Ghalmi, J. Bromage, S. Chandrasekhar i L. L. Buhl. "Evolution and systems impact of coherent distributed multipath interference". IEEE Photonics Technology Letters 17, nr 1 (styczeń 2005): 238–40. http://dx.doi.org/10.1109/lpt.2004.836902.

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Minzioni, P., i M. Tormen. "Effect of multipath interference in cascaded Bragg grating filters". IEEE Photonics Technology Letters 17, nr 9 (wrzesień 2005): 1896–98. http://dx.doi.org/10.1109/lpt.2005.852316.

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Xiao, Weimin, Jing Wang i Yan Yao. "Utilising path-coherence to combat multipath and multiuser interference". Electronics Letters 33, nr 7 (1997): 564. http://dx.doi.org/10.1049/el:19970397.

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Rice, M. "PCM/FM aeronautical telemetry in frequency selective multipath interference". IEEE Transactions on Aerospace and Electronic Systems 36, nr 4 (2000): 1090–98. http://dx.doi.org/10.1109/7.892660.

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Wang, Zhiren, Wen Chen, Danan Dong, Chenglong Zhang, Yu Peng i Zhengqi Zheng. "An Advanced Multipath Mitigation Method Based on Trend Surface Analysis". Remote Sensing 12, nr 21 (2.11.2020): 3601. http://dx.doi.org/10.3390/rs12213601.

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Among various ways to eliminate the multipath effect in high-precision global navigation satellite system positioning, the multipath hemispherical map (MHM) is a typical multipath correction method based on spatial domain repeatability, which is suitable for not only static environments, but also some dynamic carriers, such as ships and aircraft. So, it has notable advantages and is widely used. The MHM method divides the sky into grids according to the azimuth and elevation angles of satellite, and calculates the average of the residuals within the grid points as its multipath calibration value. It is easy to implement, but it will inevitably lead to excessive or insufficient multipath correction in the grid. The trend surface analysis-based multipath hemispherical map (T-MHM) method makes up for this deficiency by performing trend surface analysis on the multipath spatial changes within the grid points. However, the effectiveness of T-MHM is limited and less capable of resisting noise interference due to the multicollinearity between the independent variables caused by the special spatial distribution of multipath sampling and the overfitting problem caused by ignoring the multipath anisotropy. Thus, we proposed an improved multipath elimination method named AT-MHM (advanced trend surface analysis-based multipath hemispherical model), which cautiously judges the occurrence of the above problems and gives corresponding solutions. This was extended to double-difference mode, which expands the scope of application. The performance of AT-MHM in GPS pseudorange multipath mitigation was verified on geodetic receiver and low-cost receiver in a strong multipath environment with high occlusion.

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