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pre-processed space-time trellis codes with one-bit feedback

IEEE COMMUNICATIONS LETTERS 2005年第8期9卷 703-705页

作者： Milleth, JK Giridhar, K Jalihal, D Indian Inst Technol Dept Elect Engn Telecommun & Comp Networks Grp Madras 600036 Tamil Nadu India

Open-loop (no feedback) pre-processing methods for improving the error-rate performance of space-time trellis codes in additive white Gaussian noise (AWGN) and Ricean channels which nearly preserve the performance, in Rayleigh channels are proposed in [1]. The rotation based pre-processing preserves the Rayleigh channel performance, whereas there is a small degradation in performance in the power division based pre-processing. This degradation depends on the trellis complexity, and is more pronounced for the lower state trellis codes. In this letter, we propose a one-bit feedback method, that improves the performance of the power division method in Rayleigh channels. Simulation results for a 2 x 1 system show that this improvement is significant for the higher state trellis codes. The one-bit feedback is-used to determine which of the two channels has a higher gain, and the higher power is assigned to the corresponding transmitter.

关键词： space-time trellis codes MIMO systems diversity pre-coding fading

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Cooperative communication for high diversity gain with single antenna

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IEICE TRANSACTIONS ON COMMUNICATIONS 2007年第7期E90B卷 1868-1871页

作者： An, Ho-Jung Kim, Jee-Hoon Song, Hyoung-Kyu Sejong Univ UT Commun Res Inst Seoul South Korea

Cooperative communication enables single antenna to realize a virtual multiple antenna by sharing their antennas. Therefore, it offers transmit diversity. In this letter, we apply pre-coding scheme to the transmit symbols. Although pre-coding has shortcomings, it is possible to employ Space-Time Block Codes (STBC) with single antenna and achieve high gain.

关键词： pre-coding amplify-and-forward STBC transmit diversity CSI

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Channel Aligned Beamforming in Two-Way Multi-Pair Decode-and-Forward Relay Down-Link Channels

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IEEE WIRELESS COMMUNICATIONS LETTERS 2012年第5期1卷 464-467页

作者： Hwang, Duckdong Kim, Sang Joon Park, Chang Soon Samsung Elect Suwon South Korea

We consider the down-link of multi-pair two-way decode-and-forward (DaF) relay channel with multiple antennas at all the nodes. We propose schemes composed of relay pre-coder and user receive beam-formers to support 2M degrees of freedom when M antennas are employed at the relay. A channel aligning technique, where the channel vectors of a pair are forced to be aligned, is introduced so that we can use, at the relay, the well-known pre-coder like zero forcing (ZF) or the regularized channel inversion (RI) from the cellular down-link channels. Alternation based optimization of the pre-coder and the beam-formers searches the channel aligned vector space to further enhance the performance of the scheme in the low and mid SNR range.

关键词： pre-coding receiver beam-forming multiuser bidirectional relay

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Interference Alignment Algorithm for Considering the Throughput of Cognitive Users in Cognitive MIMO Network

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Journal of Donghua University(English Edition) 2015年第3期32卷 481-484页

作者：张慧杰李莉邱昊夏林 College of Information Machanical and Electrical EngineeringShanghai Normal University

The cognitive multiple input multiple output( MIMO)network can utilize radio spectrum efficiently and satisfy the demand of high data rate. In order to decrease the interference during transmission,a new interference alignment( IA) algorithm based on cognitive MIMO networks is proposed in this paper. The algorithm is realized by designing two-level pre-coding, the first-level precoding aligns the interference generated by the cognitive users( CUs) to unused sub-channels of the primary user( PU),thereby eliminating the interference of CUs to PU; the second-level precoding is used to improve the throughput of CUs. Simulation shows that the proposed IA algorithm can eliminate the interference that the CUs produce on the PU and improve the throughput of CUs spontaneously.

关键词： cognitive multiple input multiple output(MIMO) interference alignment(IA) pre-coding

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Broadband Multi-satellite/Multi-beam System with Single Frequency Reuse 81

Broadband Multi-satellite/Multi-beam System with Single Freq...

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81st IEEE Vehicular Technology Conference (VTC Spring)

作者： Goto, Daisuke Yamashita, Fumihiro Sugiyama, Takatoshi Kobayashi, Kiyoshi NTT Corp NTT Access Network Serv Syst Labs Tokyo Japan

ISBN: (纸本)9781479980888

This paper studies a multi-satellite multi-beam system with single frequency reuse which applies the MIMO (Multi Input Multi Output) technique. To improve the spectral efficiency of satellite systems in support of broadband communications, MIMO is the one of the most important approaches. Since it was difficult to achieve high spectral efficiency by simply combining a multi-beam system with single frequency reuse and a multiple satellite system, this paper newly proposes a pre-coding technique that takes account of the frequency offsets caused by the multiple satellites. We then evaluate our proposal by a cumulative distribution function (CDF) related to channel capacity and show the improvement of the spectral efficiency compared to the conventional satellite systems.

关键词： Satellite communication MIMO pre-coding

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pre-FEC and Post-FEC BER as Criteria for Optimizing Wireline Transceivers 53

Pre-FEC and Post-FEC BER as Criteria for Optimizing Wireline...

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IEEE International Symposium on Circuits and Systems (IEEE ISCAS)

作者： Yang, Ming Shahramian, Shayan Wong, Henry Krotnev, Peter Carusone, Anthony Chan Univ Toronto Edward S Rogers Sr Dept Elect & Comp Engn Toronto ON Canada Huawei Technol Canada Kanata ON Canada

ISBN: (纸本)9781728192017

Forward-error-correction (FEC) codes have become an integral part of high-speed wireline links. Signal-to-noise ratio, minimum mean-squared error, and pre-FEC BER are common performance metrics used to design and optimize link parameters, such as the tap coefficients in feed-forward and decision-feedback equalizers. This paper shows that the equalizer parameters found by conventional methods do not necessarily minimize post-FEC BER due to the unaccounted-for negative impact of DFE error propagation on FEC performance. However, the introduction of 1/(1+D) pre-coding eliminates long error bursts so that both pre-FEC and post-FEC BER are minimized with the same equalizer coefficients. These observations may have implications on the architecture and optimization of wireline transceivers.

关键词： forward error correction (FEC) bit error rate (BER) wireline receiver optimization feed-forward equalization (FFE) decision-feedback equalization (DFE) pre-coding

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Uplink single-user MIMO for 3GPP LTE

Uplink single-user MIMO for 3GPP LTE

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18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication

作者： Grieco, Donald M. Pan, Kyle Jung-Lin Olesen, Robert Lind Shah, Nirav InterDigital Commun Corp Melville NY USA

ISBN: (纸本)9781424411436

In this paper a multiple-input multiple-output (MIMO) scheme proposed for single carrier frequency division multiple access (SC-FDMA) system is described. Transmit and receive algorithms are developed for SC-FDMA MIMO systems. A spatial precoding closed-loop transmit beamforming (TxBF) algorithm for SC-FDMA MIMO system which uses singular value decomposition (SVD) at the transmitter and linear minimum mean square error (LMMSE) equalization at the receiver is described. Quantization and feedback schemes to support closed-loop operation are discussed. The PAPR effects and a mitigation approach are presented. Simulation results are shown for throughput vs. signal-to-noise ratio (SNR). The performance for this new TxBF algorithm is compared to Single-Input-Multiple Output (SIMO) performance. Also, single and dual-codeword performance is considered.

关键词： MIMO beamforming pre-coding SC-FDMA diversity space time coding space frequency coding feedback complexity PAPR

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A Robust Interference Alignment Algorithm in a MIMO Interference Channel 16

A Robust Interference Alignment Algorithm in a MIMO Interfer...

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16th International Symposium on Communications and Information Technologies (ISCIT)

作者： Li, Ning Wang, Siwen Zhai, Lijun China Elect Technol Grp Corp Res Inst 54 Shijiazhuang Peoples R China Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China China Elect Technology Grp Corp Applicat & Technol Aerosp Informat Lab Shijiazhuang Peoples R China

ISBN: (纸本)9781509040995

the sum rate maximization problem in Interference Alignment (IA) is hard to be solved, for the sum rate function is non-convex. The Weighted Minimum Mean Square Error (WMMSE) algorithm settles this problem by converting the original problem into an equivalent convex one. In this paper, an enhanced version of the WMMSE algorithm is presented, which takes the statistical information of the channel estimation error into consideration. Simulation results show that this algorithm has better performance than the original WMMSE algorithm and another distributed IA algorithm. Furthermore, the impact of time varying error caused by Doppler Shift is also investigated.

关键词： Interference Alignment IA MIMO pre-coding R-WMMSE

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A Robust Interference Alignment Algorithm and The System Design 11

A Robust Interference Alignment Algorithm and The System Des...

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11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Li, Ning Liu, Yun Zhai, Lijun China Elect Technol Grp Corp CET54 Beijing Res & Dev Ctr Res Inst 54th Beijing 100070 Peoples R China China Elect Technol Grp Corp CET54 CETC Key Lab Aerospace Informat Applicat Res Inst 54th Beijing 100070 Peoples R China

ISBN: (纸本)9781509047437

In this paper, we proposed an interference alignment algorithm named Robust Weighted Minimum Mean Square Error(R-WMMSE) algorithm. We also design a 3-user wireless communication system which considers realization factors to evaluate the performance of the R-WMMSE algorithm. The system is realized through a system level simulation, both in floated-point and fixed-point manner. The results suggest that the algorithm work well in real communication systems. The impact of Line-of-Sight in Rician channel is also investigated.

关键词： MIMO Interference Alignment (IA) pre-coding R-WMMSE

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Vector Perturbation precoding and User Scheduling for Network MIMO

Vector Perturbation Precoding and User Scheduling for Networ...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Mazrouei-Sebdani, Mahmood Krzymien, Witold A. Univ Alberta TRLabs Edmonton AB T6G 2V4 Canada

ISBN: (纸本)9781612842547

In this paper, we apply vector perturbation (VP) precoding to a network multiple-input multiple-output (MIMO) scheme, in which downlink transmissions from base stations are coordinated. We propose a multi-cell VP by introducing a common power scaling factor for all base stations in order to satisfy per base station power constraint. In our scenario, we consider multiple-antenna users with heterogeneous signal-to-noise ratios (SNRs). Our work is an extension of earlier work on VP to a multi-cell network with multiple-antenna users. The sum rate for the multi-cell VP in the case of uniformly distributed input is obtained and an asymptotic upper bound for it is proposed. The results show that the multi-cell VP is superior to the multi-cell block diagonalization (BD). By using the upper bound on the sum rate, we propose a user scheduling algorithm, which provides better performance and is less complex than semi-orthogonal user selection in the case of multiple-antenna users (SUS-MA).

关键词： Vector perturbation (VP) network multiple-input multiple-output (MIMO) base station coordination pre-coding user scheduling

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