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space time coding for Backscatter RFID

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2013年第5期12卷 2272-2280页

作者： Boyer, Colby Roy, Sumit Univ Washington Dept Elect Engn Seattle WA 98195 USA

In this work, the use of space-time Codes in passive Radio Frequency IDentification (RFID) systems is explored;this is feasible whenever a tag possesses multiple antennas. Information is encoded across the multiple tag antennas and received by an RFID reader, also typically equipped with multiple antennas. The nature of passive RFID induces a unique fading channel known as the dyadic backscatter channel, which differs statistically compared to the canonical Rayleigh fading channel. We introduce a modified dyadic channel for RFID backscatter that adequately captures the space-time coding paradigm. We then propose known orthogonal space-time codes and derive an upper bound on the the pairwise error probability (PEP), leading to estimates of the (asymptotic) diversity order. Interestingly, the diversity order is shown to depend only on the number of tag antennas but not the number of receive antennas;the resultant performance trade-offs is discussed. Lastly, simulation of the symbol error rates for different channel configurations are conducted to validate the analysis.

关键词： Dyadic backscatter channel modulated backscatter MIMO space-time block coding RFID

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Frequency Domain DFE for Single-Carrier STBC block Transmission

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IEEE COMMUNICATIONS LETTERS 2013年第6期17卷 1108-1111页

作者： Wang, Qiucai Yuan, Chaowei Zhang, Jinbo Hu, Ziwei Li, Yingxue Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China Beijing Univ Posts & Telecommun Sch Elect Engn Beijing 100876 Peoples R China Changan Univ Sch Elect & Control Engn Xian 710064 Peoples R China

space-time block coding (STBC) is a novel transmit diversity technique that can substantially improve the reliability of wireless communication channel. In this letter, we investigate single-carrier STBC block transmission over frequency-selective fading channel. Based on the minimum mean square error (MMSE) criterion, by exploiting the reliability of tentative decision symbols, we propose a novel suboptimal, low complexity frequency domain decision feedback equalization (FD-DFE) scheme for SC STBC. Simulation results show that the proposed scheme provides better performance than the conventional scheme.

关键词： Single-carrier space-time block coding frequency domain decision feedback equalization frequency-selective fading channel

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A STBC interference cancellation site diversity technique for a PB/MC-CDMA downlink

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IETE JOURNAL OF RESEARCH 2013年第4期59卷 319-325页

作者： Li, Changping Lee, Kyujin Cho, Juphil Lee, Kyesan Kyung Hee Univ Dept Elect & Radio Engn Suwon South Korea Semyung Univ Dept Elect Engn Jecheon South Korea Kunsan Natl Univ Sch Elect & Informat Engn Kunsan South Korea

It has been proved that site diversity is an effective technique to improve the bit error rate (BER) performance for users located at the cell edge. In this paper, the downlink site diversity is applied to a partial block multicarrier-CDMA (PB/MC-CDMA) system, which is a newly proposed and more flexible system compared to the well-known multicarrier CDMA (MC-CDMA) system. We propose a space-time block coding with interference cancellation (STBC-IC) site diversity scheme, where the STBC is adopted on the site diversity participant base stations. A joint code assignment enables the mobile users to get full diversity and reduce inter-cell interference, whereas IC eliminates the intra-cell interference from the users that use the same partial block as the desired user. The BER performances using site diversity, STBC site diversity, and the proposed STBC-IC site diversity in PB system are evaluated by computer simulations. The results show that the site diversity technique works well in the PB system for users close to the cell edge. With the proposed STBC-IC site diversity scheme, we can expect satisfying BER and throughput results.

关键词： Interference cancellation Partial block multicarrier-code division multiple access system Site diversity space-time block coding

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Frequency-Domain Equalization for Orthogonal and Quasi-Orthogonal STBCs over Frequency-Selective Wireless and Power-Line Channels

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WIRELESS PERSONAL COMMUNICATIONS 2013年第4期71卷 2445-2461页

作者： Sheikh-Hosseini, Mohsen Molavi-Kakhki, Mohammad Hodtani, Ghosheh Abed Ferdowsi Univ Mashhad Dept Elect Engn Program Commun Engn Mashhad Iran Ferdowsi Univ Mashhad Dept Elect Engn Mashhad Iran

In recent years, combination of single-carrier frequency-domain equalization (SC-FDE) and space-time block coding/code (STBC) techniques to exploit the advantages of both, has received a great attention. In this paper we propose new techniques for combining SC-FDE with orthogonal and Quasi-orthogonal STBCs applicable to any number of transmit antennas. For Quasi-orthogonal STBC we first propose a new structure for codes with four transmit antennas and then extend it to higher numbers. We convert Quasi-orthogonal system to two equivalent orthogonal subsystems and equalize and decode these subsystems based on our proposed procedure for orthogonal codes. Finally, we present our simulation results for different frequency-selective wireless and power-line channels and show that a significant SNR gain is achieved when SC-FDE is combined with diversity techniques.

关键词： Frequency-selective fading channels Power line communication space-time block coding Single-carrier frequency-domain equalization

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Orthogonal Differential Modulation for MIMO Multiple Access Channels with Two Users

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IEEE TRANSACTIONS ON COMMUNICATIONS 2013年第6期61卷 2374-2384页

作者： Poorkasmaei, Sina Jafarkhani, Hamid Univ Calif Irvine Ctr Pervas Commun & Comp Irvine CA 92697 USA

This paper proposes a differential encoding scheme and several differential decoding schemes for a two-user MIMO system based on orthogonal space-time block codes (OSTBCs) when neither the transmitter nor the receiver knows the channel. We derive low complexity differential decoders for users with two transmit antennas based on three different decoding methods. We deploy dynamic programming in our methods to maintain a low decoding complexity. Simulations demonstrate that our differential schemes using the proposed low complexity decoders provide full transmit diversity. We also present additional differential decoding schemes that achieve full diversity, perform significantly better than the existing schemes, and work for any square OSTBC, but need higher decoding complexity. The proposed schemes work for any number of receive antennas. Moreover, we analyze the diversity of the proposed schemes. To the best of our knowledge, our low complexity schemes are the first low complexity differential schemes for multi-user MIMO systems.

关键词： Differential detection multi-user detection interference suppression orthogonal designs space-time block coding

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Combined adaptive beamforming with space-time block coding for multi-antenna communications

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Science in China(Series F) 2008年第12期51卷 2062-2073页

作者： LIN Min LI Min YANG LuXi LI Bin School of Information Science and Engineering Southeast University Nanjing 210096 China Nanjing Institute of Telecommunication Technology Nanjing 210007 China Huawei Technologies Co. Ltd. Shenzhen 518129 China

Aiming at the multi-antenna communication systems, a downlink transmit scheme combining adaptive beamforming （ABF） with space-time block coding （STBC） is first presented, which utilizes the maximization of the output mean signal-to-noise ratio （SNR） and the minimization of the symbol error rate （SER） upper bound of the three widely used modulations as the design criteria. Then, based on the moment generating function （MGF） and the Gauss-Chebyshev integration, a simple and accurate numerical method is presented to analyze the SER performance of the system with the new transmit scheme under the three commonly used modulations. Finally, computer simulation results demonstrate the effectiveness and superiority of the proposed strategy.

关键词： adaptive beamforming space-time block coding transmit scheme multi-antenna communication

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MMSE detection for space-time block coding over time-selective fading channels

MMSE detection for space-time block coding over time-selecti...

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Canadian Conference on Electrical and Computer Engineering

作者： Yu, Donghun Seoul Natl Univ Seoul South Korea

ISBN: (纸本)9781424416424

A detector for space-time block coding is proposed to combat time-selective fading. To suppress both noise and interference, a minimum mean square error (MMSE) based detector is introduced for space-time block coding. It is shown that the proposed detector outperforms the conventional detectors when the channel is time-selective fading.

关键词： detectors time-selective fading channels least mean square methods MIMO systems space-time block coding

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A new transmit scheme combining beamforming with space-time block coding

A new transmit scheme combining beamforming with space-time ...

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IEEE International Conference on Communications (ICC 2008)

作者： Lin, Min Yang, Luxi Zhu, Wei-Ping Li, Min Li, Bin Southeast Univ Sch Informat Sci & Engn Nanjing 210096 Jiangsu Peoples R China Nanjing Inst Telecommun Technol Nanjing 210096 Jiangsu Peoples R China Concordia Univ Dept Elect & Comp Engn Quebec City H3G1M8 PQ Canada Huawei Technol Co Ltd Shenzhen 518129 Peoples R China

ISBN: (纸本)9781424420742

In this paper, a new transmit scheme combining beamforming (BF) with space-time block coding (STBC) is proposed for correlated fading channels. Based on maximizing the output mean signal-to-noise ratio (SNR) at the receiver, the transmitter BF weight vectors are first derived. Then, utilizing the minimal bit error rate (BER) upper bound as the design criterion, a simple power allocation algorithm is developed. Next, the BER performance of the system with the proposed transmit scheme is analyzed by considering an M-QAM constellation. Finally, computer simulation results are given to verify the effectiveness of the proposed scheme.

关键词： beamforming BER correlated fading channel space-time block coding multi-antenna communication

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Channel Coded STBC-OFDM based Transmit Diversity Systems in Multipath Rayleigh-Fading Channels

Channel Coded STBC-OFDM based Transmit Diversity Systems in ...

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2nd International Conference on Advanced Computing, Networking and Security (ADCONS)

作者： Surendar, M. Muthuchidambaranathan, P. Natl Inst Technol Dept Elect & Commun Engn Tiruchirappalli 620015 Tamil Nadu India

ISBN: (纸本)9780769551272

In this paper, a channel coded space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) system using Alamouti coding scheme is proposed and their performance is compared in terms of bit error rate (BER) with the existing STBC-OFDM system. The system has been investigated using various modulation techniques such as BPSK, QPSK, 16-PSK and 4-QAM. For channel coding technique, the convolutional encoder is used at the transmitter and the Viterbi decoder is used at the receiver. Simulation results shows the advantage of combining the channel coding with the STBC-OFDM system. It is shown that channel coded STBC-OFDM system has a better BER performance over the conventional system. The proposed system achieves a coding gain (CG) of over 6.0 dB in multipath Rayleigh-fading channel.

关键词： Alamouti coding orthogonal frequency-division multiplexing Rayleigh-fading channel space-time block coding transmit diversity

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Multiuser detection in DS-CDMA systems using POCS algorithm

Multiuser detection in DS-CDMA systems using POCS algorithm

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21st Telecommunications Forum (TELFOR)

作者： Voicu, C. Lohan, E. S. Halunga, S. Univ Politehn Bucuresti Telecommun Dept Elect Telecommun & Informat Technol Fac Bul Iuliu Maniu 1-3 Bucharest 061071 Romania Tampere Univ Technol Dept Elect & Commun Engn Tampere 33101 Finland

ISBN: (纸本)9781479914203

This paper presents the results obtained by a new multiuser detector based on the Projection Onto Convex Sets (POCS) deconvolution algorithm, in comparison with those obtained by the decorrelating detector, when the channel is affected by the flat Rayleigh fading and gray images are transmitted through the system. All the users transmit their information with the same power, but the spreading codes are correlated. We will investigate the fading effect on the received images and the impact of the crosscorrelation of the spreading codes on the quality of the received images. In the end, several conclusions are highlighted, with respect to the level of performance achieved.

关键词： Decorrelating detector POCS algorithm image transmission space-time block coding universal image quality index visual information fidelity index

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