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RLS and its improved algorithms in MIMO-OFDM system

INTERNATIONAL JOURNAL OF MODELLING IDENTIFICATION AND CONTROL 2012年第3期16卷 246-250页

作者： Li, Mei Wang, Xiang Zhang, Xiaoming Jia, Ke Hebei Univ Sci & Technol Inst Informat Sci & Engn Dept Comp Sci & Technol Shijiazhuang 050018 Hebei Peoples R China Hebei Univ Sci & Technol Inst Informat Sci & Engn Dept Network Engn Shijiazhuang 050018 Hebei Peoples R China

This paper will analyse the RLS algorithm and its improved algorithms, QRD-RLS and IQRD-RLS algorithms. QRD-RLS and IQRD-RLS algorithms can reduce the complexity of RLS algorithm effectively. Then, we apply these three algorithms in MIMO-OFDM system, and we do some simulations on these three algorithms. From the simulation, we can see that the performance of the QRD-RLS and IQRD-RLS algorithms is better than RLS algorithm.

关键词： multiple-input multiple-output MIMO orthogonal frequency division multiplexing channel estimation RLS algorithm

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A novel adaptive V-BLAST algorithm based on subspace tracking and Hermitian matrix perturbation theorem

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Science China(Information Sciences) 2012年第2期55卷 322-336页

作者： LV WangYong1,2,WANG HuiQi1,MA Hong1 & ZHOU YongDao1 1College of Mathematics,Sichuan University,Chengdu 610065,China 2College of Mathematics and Software Science,Sichuan Normal University,Chengdu 610068,China 1. College of Mathematics Sichuan University Chengdu 610065 China2. College of Mathematics and Software Science Sichuan Normal University Chengdu 610068 China

A novel vertical Bell laboratories layered space-time(V-BLAST)system with adaptive successive interference cancellation(SIC)detector based on subspace tracking(SST)and Hermitian matrix perturbation theorem is proposed in this paper,and the corresponding optimal symbol detection order operation is ***,asymptotic limit theorems for the detectors are *** final simulation results verify that the symbol error probability(SEP)performance,the immunity to channel estimation errors and the algorithm convergence rate are superior to that of the conventional V-BLAST detection algorithm when channel estimation errors exist.

关键词： successive interference cancellation subspace tracking multiple-input multiple-output channel estimation error

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Hierarchical DWT-based optimal diversity power allocation for video transmission in OFDMA/MIMO wireless systems

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INTERNATIONAL JOURNAL OF INTERNET PROTOCOL TECHNOLOGY 2012年第1期7卷 39-51页

作者： Mahajan, Sohil Jagannatham, Aditya K. Indian Inst Technol Elect Engn Dept Kanpur 208016 Uttar Pradesh India

In this paper, we propose novel algorithms for optimal power allocation towards video transmission in orthogonal frequency division multiple access (OFDMA) and multiple-input multiple-output (MIMO)-based 4G networks. A unique feature of the schemes is that they employ diversity dependent subcarrier power distribution relying on a discrete wavelet transform (DWT)-based hierarchical video decomposition, with exclusively order statistics-based partial channel state information (CSI). This is formulated as a convex minimisation problem and closed form expressions are derived for diversity-based optimal power allocation. We also propose novel algorithms for diversity order-based optimal power allocation for video transmission in MIMO systems. Further, we consider a practical MIMO scenario and employ a limited feedback technique utilising the index of the quantised beamforming vector. A closed form expression for the optimal power allocation is presented based on an iterative convex optimisation framework. Simulation results demonstrate superior performance of the proposed optimal power allocation schemes.

关键词： orthogonal frequency division multiple access OFDMA multiple-input multiple-output MIMO convex optimisation optimal power allocation OPA wireless video transmission

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Degrees of Freedom Region for an Interference Network With General Message Demands

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IEEE TRANSACTIONS ON INFORMATION THEORY 2012年第6期58卷 3787-3797页

作者： Ke, Lei Ramamoorthy, Aditya Wang, Zhengdao Yin, Huarui Iowa State Univ Dept Elect & Comp Engn Ames IA 50011 USA Univ Sci & Technol China Dept Elect Engn & Informat Sci Hefei 230027 Peoples R China

We consider a single-hop interference network with K transmitters and J receivers, all having M antennas. Each transmitter emits an independent message and each receiver requests an arbitrary subset of the messages. This generalizes the well-known K-user M-antenna interference channel, where each message is requested by a unique receiver. For our setup, we derive the degrees of freedom (DoF) region. The achievability scheme generalizes the interference alignment schemes proposed by Cadambe and Jafar. In particular, we achieve general points in the DoF region by using multiple base vectors and aligning all interferers at a given receiver to the interferer with the largest DoF. As a byproduct, we obtain the DoF region for the original interference channel. We also discuss extensions of our approach where the same region can be achieved by considering a reduced set of interference alignment constraints, thus reducing the time-expansion duration needed. The DoF region for the considered system depends only on a subset of receivers whose demands meet certain characteristics. The geometric shape of the DoF region is also discussed.

关键词： Degrees of freedom (DoF) region interference alignment interference network multicast multiple-input multiple-output

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Differential Mode Delay Managed Transmission Line for WDM-MIMO System Using Multi-Step Index Fiber

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2012年第17期30卷 2783-2787页

作者： Sakamoto, Taiji Mori, Takayoshi Yamamoto, Takashi Tomita, Shigeru NTT Access Networks Serv Syst Labs Tsukuba Ibaraki 3050805 Japan

We proposed a mode group delay managed transmission line for a WDM-MIMO system consisting of fibers with positive and negative DMDs to compensate for the total DMD. We show numerically that the multi-step index fiber can flexibly tune the DMD. We fabricated fibers for use in a C-L band WDM-MIMO system, and realized a 20.4 km-long DMD compensated transmission line with a total absolute DMD of less than 111 ps over the entire C-L band. Finally, we achieved a 2 x 2 WDM-MIMO transmission within the C-L band by using equalizers with a small tap number.

关键词： Differential mode delay digital signal processing multiple-input multiple-output optical fiber

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Linear Transceiver and Receiver Design Methods for Multiuser MIMO Channels

Linear Transceiver and Receiver Design Methods for Multiuser...

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4th International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Wei, Lili Chen, Wen Wei, Yuejun Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200030 Peoples R China Huawei Technol Co Ltd Wireless Res Dev Shanghai 200030 Peoples R China

ISBN: (纸本)9781467358293;9781467358309

multi-user multiple-input multiple-output (MIMO) system with multiple data streams per user and quantized channel state information at the transmitter. We minimize the sum mean squared error (SMSE) under a sum power constraint with quantization based on the mean squared inner product. We make three contributions: (i) we remove dimensionality constraints on the MIMO configuration and the resulting feedback overhead scales linearly with the number of data streams;(ii) we use the combination of eigenmode combining and minimum mean square error receiver that makes user's feedback mutually independent;(iii) we analyze SMSE at high signal-to-noise ratio and large number of transmit antennas and derive an approximate SMSE floor.

关键词： beamforming code-division multiplexing fading channels linear receiver multiple-input multiple-output multiuser

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Integer-Forcing Linear Receiver Design over MIMO Channels

Integer-Forcing Linear Receiver Design over MIMO Channels

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IEEE Global Communications Conference (GLOBECOM)

作者： Wei, Lili Chen, Wen Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200030 Peoples R China

Motivated by recently presented integer-forcing linear receiver architecture, we propose algorithms to design optimal integer-forcing coefficient matrix such that the total achievable rate is maximized.

ISBN: (纸本)9781467309219;9781467309202

关键词： multiple-input multiple-output linear receiver lattice codes compute-and-forward multiple-access channel

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On the Secret Channel Capacity of MIMO System under Fading Environment

On the Secret Channel Capacity of MIMO System under Fading E...

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8th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Wang Jun Zhu Ge Yu Xiaochuan Xian Inst Space Radio Technol Sci & Technol Space Microwave Lab Xian 710100 Peoples R China

ISBN: (纸本)9781612846835;9781612846828

In this paper, the channel capacity of a multiple input multiple output (MIMO) broadcast system is investigated under correlated fading environment where there exists a transmitter, a legitimate receiver and an eavesdrop, each node equipped with multiple antennas. We derive the secret capacity and its upper bound of the MIMO broadcast channel in detail by using the Information theory and random matrices theory.

关键词： multiple-input multiple-output Secret Channel Capacity Spatial Correlation

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A MAC Protocol with Multi-Packet Reception for MIMO Ad Hoc Networks

A MAC Protocol with Multi-Packet Reception for MIMO Ad Hoc N...

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8th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Cui, Miao Cao, Yinglie Lin, Shaoliang Zhang, Xiaomu Guangdong Univ Technol Sch Informat Guangzhou Guangdong Peoples R China China Elect Technology Grp Corp 7 Res Inst Guangzhou Peoples R China

ISBN: (纸本)9781612846835;9781612846828

multiple-input multiple-output (MIMO) systems are capable of simultaneously capturing more than one packet. Such capability is known as Multi-Packet Reception (MPR), which is new way to improve performance of Ad Hoc Networks. In order to effectively enhance throughput of Ad Hoc Networks, a novel MAC protocol (MIMO-MAC) with MIMO links that takes into account MPR is proposed. It can receive more than one RTS before responding CTS, which maximizes transmission links simultaneously. Receiver determines links according to the number of its own antennas and RTS. Compare to the existing protocol, it allows many communications at the same time in one competitive area. Finally, simulations are implemented in terms of load and source nodes number in OPNET environment, results show that MIMO-MAC outperforms CSMA/CA and CSMA/CA (k).

关键词： Ad Hoc Networks multiple-input multiple-output Multi-Packet reception MAC protocol

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MIMO Downlink Communication Employing Multi-user Transmitter Pre-processing Based on Vector Quantized Channel Spatial Information: Performance Results

MIMO Downlink Communication Employing Multi-user Transmitter...

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International Conference on Communication and Signal Processing

作者： Prabagarane Nagaradjane Shriram Swaminathan Suraj Krishnan Selvam Paranche Damodaran Arun Swaminathan the Department of ECE SSN Institutions Chennai India. the Department of ECE Georgia Institute of TechnologyAtlanta Georgia USA. Qualcomm Inc. Boulder Colorado USA. Department of Mobile Communications Eurecom Sophia Antipolis (Telecom Paristech) France. Qualcomm Inc. San Diego CA USA.

ISBN: (纸本)9781467348652

In this letter, we report the performance of multiuser transmitter pre-processing (MUTP) assisted multiple-input multiple-output downlink (DL) communication, when the channel state information (CSI) required to formulate the preprocessing matrix is estimated at the receiver and fed back to the base station (BS) through feedback channels that experience noise. In particular, in our work the CSIs are estimated at the mobile stations (MSs) and the estimated CSIs (ECSIs) are decomposed by invoking singular value decomposition. The signal space of right-hand side unitary matrix of the decomposed ECSI associated with each of the MSs is then vector quantized and the magnitudes and phases are communicated to the BS as channel spatial information through noisy feedback channels. This vector quantized channel spatial information which is tainted by noise is recovered by employing minimum mean square error based linear detector. The recovered spatial information is then utilized to conceive the pre-processing matrix to deal with the DL multi-user interference (MUI). Our study shows that, MUTP realized with perfect CSI at the BS is capable of completely eliminating the MUI. However, vector quantized channel spatial information based MUTP results in imperfect removal of MUI, as the quantization errors and feedback channel induced errors play a principal role in determining its performance in the context of interference removal. Albeit the achievable symbol error rate (SER) slightly degrades compared to the perfect CSI case, we advocate that vector quantization seems to be an efficient approach in quantizing the necessary spatial information and feeding them back to the BS for the purpose of formulating the pre-processing matrix particularly in frequency division duplex aided wireless systems.

关键词： Channel spatial information perfect CSI minimum mean square error multi-antenna interference multiuser interference multiple-input multiple-output singular value decomposition vector quantization

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