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Optimal MMSE successive interference cancellation in group-wise STBC MIMO systems

Journal of Systems Engineering and Electronics 2006年第1期17卷 85-90页

作者： Fan Xun Zhang Haibin Luo Hanwen Huang Jianguo Dept. of Electronic Engineering Shanghai Jiaotong Univ. Shanghai 200030 P. R. China

An optimal minimum mean square error successive interference cancellation （OMMSE SIC） scheme for Groupwise space-time block coding （G-STBC） multiple-input multiple-output （MIMO） systems is presented. In such a system, transmit antennas are partitioned into several STBC encoding groups and each group transmits independent data stream which is individually STBC encoded. On the receiver side, by exploring the temporal constraint provided by STBC, an equivalent channel model similar to the one in standard vertical Bell laboratories layered space-time （V-BLAST） systems is generated. Then OMMSE SIC algorithm is performed to detect all the transmitted information. Simulation compares the proposed scheme with non-ordering MMSE SIC scheme and the corresponding equal data rate scheme in V-BLAST systems with the same receive antennas＇ number. Result shows that the proposed scheme has better performance than non-ordering MMSE SIC scheme and by introducing more transmit antennas and adopting the OMMSE SIC scheme, better performance also can be achieved than corresponding V-BLAST systems.

关键词： multi-input multi-output vertical Bell laboratories layered space-time space-time block coding minimum mean square error

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A novel single carrier space-time block-coded CDMA system with iterative receiver

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2007年第11期E90A卷 2369-2376页

作者： Tseng, Der-Feng Lai, Wei-Yu Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei 106 Taiwan

In this paper, we employ time-reversal space-time block coding (TR-STBC) in single-carrier direct sequence code-division multiple access (DS-CDMA) block transmission in the presence of multiple access interference (MAI) as well as intersymbol interference (ISI), which is subject to fairly long delay spread. We introduce the transmission rate improvement by capitalizing on the assignment of additional spreading codes to each user so as to expand the cardinality of space-time code matrix with no sacrifice of diversity order. Given perfect channel state information at the receiver, a simple linear frequency-domain interference suppression scheme on a basis of symbol-by-symbol processing is developed under certain circumstances. A "turbo principle" receiver is facilitated by exploiting the serially concatenated structure at the transmitter to further enhance system performance. Simulation results justify the efficacy of our proposed system and also present performance comparisons with some existing systems in terms of bit error rate (BER).

关键词： block transmission space-time block coding CDMA turbo principle frequency-domain equalization

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Single-carrier space-time block-coded transmissions over frequency-selective fading channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2003年第1期49卷 164-179页

作者： Zhou, SL Giannakis, GB Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

We study space-time block coding for single-carrier block transmissions over frequency-selective multipath fading channels. We propose novel transmission schemes that achieve a maximum diversity of order NtNr(L + 1) in rich scattering environments, where N-t (N-r) is the number of transmit (receive) antennas, and L is the order of the finite impulse response (FIR) channels. We show that linear receiver processing collects full antenna diversity, while the overall complexity remains comparable to that of single-antenna transmissions over frequency-selective channels. We develop transmissions enabling maximum-likelihood optimal decoding based on Viterbi's algorithm, as well as turbo decoding. With single receive and two transmit antennas, the proposed transmission format is capacity achieving. Simulation results demonstrate that joint exploitation of space-multipath diversity leads to significantly improved performance in the presence of frequency-selective fading channels.

关键词： block transmissions frequency-selective multipath channels space-time block coding

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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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Analogue Radio Over Fiber Aided MIMO Design for the learning Assisted Adaptive C-RAN Downlink

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IEEE ACCESS 2019年 7卷 21359-21371页

作者： Li, Yichuan Satyanarayana, Katla El-Hajjar, Mohammed Hanzo, Lajos Univ Southampton Sch Elect & Comp Sci NGW Grp Southampton SO17 1BJ Hants England

The cloud/centralized radio access network (C-RAN) architecture is recognized as a strong candidate for the next generation wireless standards, potentially reducing the total cost of ownership. Spatial modulation (SM) is a cost-effective multiple-input-multiple-output (MIMO) solution, where only a single-radio frequency chain is required for transmission. In this context, we propose analogue radio over fiber (A-RoF) aided MIMO techniques for learning assisted adaptive C-RAN system, where SM combined with space-time block coding is optically processed relying on the optical frequency indices in the central unit of the C-RAN, which also is capable of tuning the connected remote radio heads (RRHs). Furthermore, to improve the spectral efficiency, we invoke our proposed flexible C-RAN architecture for implementing learning assisted transceiver adaptation, where the number of RRHs connected to a single user and its modulation techniques employed are controlled using the K-nearest neighbor algorithm. The simulation results show that the bit error ratio performance of our A-RoF system is only marginally degraded compared to that operating without the A-RoF link, while benefiting from our energy- and cost-efficient C-RAN design. Moreover, we show that the learning assisted adaptation is capable of outperforming the classic threshold-based adaptation in terms of the system's achievable rate.

关键词： Analogue radio over fiber C-RAN spatial modulation space-time block coding fronthaul Mach-Zehnder modulator transceiver adaptation machine learning

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Asynchronous Orthogonal Differential Decoding for Multiple Access Channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2015年第1期14卷 481-493页

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

We propose several differential decoding schemes for asynchronous multi-user MIMO systems based on orthogonal space-time block codes (OSTBCs), where neither the transmitters nor the receiver has knowledge of the channel. First, we derive novel low complexity differential decoders by performing interference cancellation in time and employing different decoding methods. The decoding complexity of these schemes grows linearly with the number of users. We then present additional differential decoding schemes that perform significantly better than our low complexity decoders and outperform the existing synchronous differential schemes but require higher decoding complexity compared to our low complexity decoders. The proposed schemes work for any square OSTBC, any constant amplitude constellation, any number of users, and any number of receive antennas. Furthermore, we analyze the diversity of the proposed schemes and derive conditions under which our schemes provide full diversity. For the cases of two and four transmit antennas, we provide examples of PSK constellations to achieve full diversity. Simulation results show that our differential schemes provide good performance. To the best of our knowledge, the proposed differential detection schemes are the first differential schemes for asynchronous multi-user systems.

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

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Enhanced security and reliability with MIMO communications for smart grid

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SECURITY AND COMMUNICATION NETWORKS 2015年第16期8卷 2723-2729页

作者： Wang, Xin Zhang, Lijun Deokar, Amit Liang, Qilian Univ Texas Arlington Dept Elect Engn Arlington TX 76019 USA China Univ Geosci Dept Elect Informat & Mech Wuhan 430074 Peoples R China

As a critical infrastructure element, smart grid is facing security and reliability challenges. In this paper, we have investigated the real-time communication between a smart meter and the central control system, a component that provides centralized monitoring and performs control operations for the power grid. To combat severe communication impairments induced by malicious attacks or link failures, we propose to implement space-time block coding over multiple antennas at the transmitter and the receiver. We first investigated the security challenges from malicious attacks, in which the malicious attacks of additive pattern were primarily addressed. Reliability challenges from link failure were then considered. Finally present were extensive numerical studies on multiple-link attacks, multiple-link failures and receiver with detection scenarios. Simulations showed that additive malicious attacks and link failures could be effectively mitigated in virtue of space-time block coding. Meanwhile, it is verified that more antennas will give more diversity gain and better performance. Copyright (c) 2012 John Wiley & Sons, Ltd.

关键词： smart grid security challenges malicious attacks link failures smart meter space-time block coding multiple-input multiple-output (MIMO)

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Performance of group ordered successive interference cancellation for multiuser detection in GSTBC SFH/MC DS-CDMA system

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2006年第4期6卷 475-482页

作者： Cai, Lingyun Xu, Youyun Zhang, Habin Song, Wentao Shanghai Jiao Tong Univ Inst Wireless Commun Technol Dept Elect Engn Shanghai 200030 Peoples R China PLA Univ Sci & Technol Nanjing 210007 Peoples R China

In this paper, we present a novel group space-time block coding slow frequency-hopping multicarrier direct-sequence code division multiple access (GSTBC SFH/MC DS-CDMA) system over frequency selective fading channels. The proposed scheme greatly improves the bandwidth-efficient through assigning the users employing the same frequency-hopping (FH) pattern. Moreover, the users employing the same FH pattern are assigned into different virtual groups, in which the users are assigned to the different spreading codes, while the users are assigned to the same spreading code in the same virtual group. Then, a novel group detection scheme that we denote by group ordered successive interference cancellation (GOSIC) is presented to suppress the interference between the different virtual groups. Our proposed scheme consists of ordering group at the receiver side in order to maximize the overall system performance, and carrying BLAST-STBC (LSTBC) detection for the users in the same virtual group. We define and derive the optimal group order based on the post group signal to interference plus noise ratio (PGSINR). We also propose another suboptimal group order in order to overcome the complexity issues. Finally, we compare the performance of our proposed GOSIC with conventional group successive interference cancellation (GSIC), conventional STBC multiuser detection (MUD), and LSTBC-MUD, and show that significant improvement is introduced. Finally, it is shown that the proposed scheme is robust to the imperfect channel estimation. Copyright (C) 2006 John Wiley & Sons, Ltd.

关键词： slow frequency-hopping multicarrier direct-sequence code division multiple access orthogonal frequency division multiplexing space-time block coding blast multiuser detection

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Blind Channel Estimation in Orthogonally Coded MIMO-OFDM Systems: A Semidefinite Relaxation Approach

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2009年第6期57卷 2354-2364页

作者： Sarmadi, Nima Shahbazpanahi, Shahram Gershman, Alex B. Tech Univ Darmstadt Dept Commun Syst NTS D-64283 Darmstadt Germany Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON L1H 7K4 Canada

A new blind channel estimation approach for orthogonally coded multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems is proposed. The main idea of our technique is, using specific properties of the orthogonal space-time block codes (OSTBCs), to estimate the finite impulse response (FIR) channel parameters in the time domain instead of doing this in the frequency domain independently for each subcarrier. This results in a substantially improved parsimony of the channel parametric model as compared to the direct per subcarrier channel estimation methods and allows coherent processing across the subcarriers. It is shown that using the semidefinite relaxation (SDR) technique, our channel estimation problem can be approximated as a convex semidefinite programming (SDP) problem and, hence, can be solved efficiently using modern convex optimization methods. Our simulations validate the performance and/or computational complexity advantages of the proposed method as compared to some current state-of-the-art blind MIMO-OFDM channel estimation methods.

关键词： Channel estimation multiple-input multiple-output systems orthogonal frequency-division multiplexing semidefinite relaxation space-time block coding

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space-time Processing for X Channels Using Precoders

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2012年第4期60卷 1849-1861页

作者： Li, Feng Jafarkhani, Hamid Univ Calif Irvine Ctr Pervas Commun & Comp Irvine CA 92664 USA

In this paper, we investigate how to send space-time codes with full diversity and low decoding complexity for X channels using precoders. First, we assume that we have 2 transmitters and 2 receivers. Each transmitter sends different codewords to each receiver at the same time. We propose an orthogonal transmission scheme that combines space-time block coding and array processing to achieve low-complexity decoding and full diversity for transmitted signals. To our best knowledge, this is the first scheme which can achieve low-complexity decoding and full diversity for any transmitted codeword in X channel when all the users transmit at the same time. Finally, we show that under certain conditions, our proposed scheme can be extended to a general case with any number of transmitters and receivers each with any number of antennas. Simulation results validate our theoretical analysis.

关键词： Array processing full diversity interference cancellation precoder design space-time block coding X channels

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