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Optimization of MIMO transceiver with limited feedback channel

Optimization of MIMO transceiver with limited feedback chann...

引用

5th International Workshop on Signal Design and Its Applications in Communications, IWSDA'11

作者： Xiao, Pei Chen, Qingchun University of Surrey Guildford Surrey GU2 7XH United Kingdom Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu 610031 China

ISBN: (纸本)9781612840468

This work addresses joint transceiver optimization for multiple-input, multiple-output (MIMO) systems. In practical systems the complete knowledge of channel state information (CSI) is hardly available at transmitter. To tackle this problem, we resort to the codebook approach to precoding design, where the receiver selects a precoding matrix from a finite set of predefined precoding matrices based on the instantaneous channel condition and delivers the index of the chosen precoding matrix to the transmitter via a bandwidth-constraint feedback channel. In this paper, the codebook based precoding design at transmitter is optimized jointly with decoding design at receiver. © 2011 IEEE.

关键词： Channel state information

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New families of binary sequences with low correlation and large size

New families of binary sequences with low correlation and la...

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作者： Zhou, Zhengchun Tang, Xiaohu Department of Applied Mathematics School of Information Science and Technology Southwest Jiaotong University Chengdu China Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu China

In this paper, for odd n and any k with gcd(n, k) = 1, new binary sequence families Sk of period 2n-1 are constructed. These families have maximum correlation 1+2n+3/2, family size 22n +2n +1 and maximum linear span n(n+1)/2 . The correlation distribution of Sk is completely determined as well. Compared with the modified Gold codes with the same family size, the proposed families have the same period and correlation properties, but larger linear span. As good candidates with low correlation and large family size, the new families contain the Gold sequences and the Gold-like sequences. Furthermore, Sk includes a subfamily S1k which has the same period, correlation distribution, family size and linear span as the family S o(2) recently constructed by Yu and Gong. In particular, when k = 1, S1k is exactly So(2). Copyright © 2009 The Institute of Electronics, information and Communication Engineers.

关键词： Binary sequences

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Optimal selection of cooperative RAUs in HSR based distributed antenna systems and mobile relay with massive antennas

Optimal selection of cooperative RAUs in HSR based distribut...

引用

International Workshop on High Mobility Wireless Communications (HMWC)

作者： Ziyue Liu Pingzhi Fan Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781467376303

This paper studies the performance and designs of high speed railway (HSR) communications that employ massive multiple-input multiple-output (MIMO) systems, where a mobile relay (MR) with a large number of antennas is mounted on the train. The users onboard the train communicate with the ground base station (BS) via MR, i.e. two-hop communications. The distributed antenna system (DAS) is used on ground, where a BS consists of a central unit (CU) and a number of remote antenna units (RAUs) connecting to the CU by optical fiber. The issue of selecting an optimal cooperative RAU set of a linear DAS for railway scenario is addressed. We present a low complexity approach to select a transmit RAU set for capacity maximization, based on the theory of convex optimization. We show via extensive Monte-Carlo simulations that the proposed algorithm provides performance very close to that of optimal selection based on exhaustive search.

关键词： MIMO Antenna arrays Mobile communication Mobile antennas Transmitting antennas Relays

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A physical layer secure wireless communication scheme for high speed railway

A physical layer secure wireless communication scheme for hi...

引用

International Workshop on Signal Design and Its Applications in Communications (IWSDA)

作者： Cui Yaping Xuming Fang Key Lab of Information Coding & Transmission Southwest Jiaotong University Chengdu China

The high speed railway wireless communication system is much different from public wireless communication system, because the service is train control messages, which is closely related to the safety of train transportation. Thus it is much demanding to the security and reliability. To guarantee the train control messages delivery security, secrecy capacity and outage probability at the high speed railway scenario under single-stream beamforming are analyzed and show that the security requirements can not been satisfied. Thus a physical layer secure wireless communications scheme under beamforming with artificial noise is proposed for high speed railway. In this scheme, artificial noise is used in the null space of the main channel only to degrade the eavesdropper's channel. Simulation results illustrate the proposed scheme decreases the outage probability under a certain secrecy capacity demand, and meets the secure communication requirements.

关键词： Array signal processing Rail transportation Physical layer Security Wireless communication Capacity planning Safety

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Low correlation zone sequences from interleaved construction

Low correlation zone sequences from interleaved construction

引用

作者： Parampalli, Udaya Tang, Xiaohu Department of Computer Science and Software Engineering University of Melbourne VIC 3010 Australia Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu China

Recently there has been a surge of interest in construction of low correlation zone sequences. The purpose of this paper is to survey the known results in the area and to present an interleaved construction of binary low correlation zone sequences. The interleaved constructionunifies many constructions currently available in the literature. These sequences are useful in quasi-synchronous code-division multiple access (QS-CDMA) communication systems. Copyright © 2010.

关键词： Code division multiple access

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Energy-Spectral Efficiency Tradeoff of Downlink NOMA System with Fairness Consideration

Energy-Spectral Efficiency Tradeoff of Downlink NOMA System ...

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IEEE Vehicular Technology Conference

作者： Dadong Ni Li Hao Xiaomin Qian Quang Thanh Tran Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

In this paper, we explore the energy efficiency (EE) and spectral efficiency (SE) tradeoff with α-fairness consideration for downlink non-orthogonal multiple access (NOMA) networks based on a multi-objective optimization problem. To acquire the Pareto optimal solution of the original optimization problem, the weighted sum method is adopted to transfer the multi-objective optimization problem to a single-objective optimization problem. The trade-off between SE and EE with fairness considered can be captured through the Pareto optimal solution. Simulation results reveal the achievable SE and EE with same α of NOMA networks outperform that of OFDMA protocol as α is small, and the NOMA networks with more multiplexed users have better performance in EE and SE of NOMA networks as the fairness level among users is higher.

关键词： NOMA Resource management Downlink Multiplexing Pareto optimization Interference

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Specific Emitter Identification Based on CNN via Variational Mode Decomposition and Bimodal Feature Fusion

Specific Emitter Identification Based on CNN via Variational...

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Power Electronics, Computer Applications (ICPECA), IEEE International Conference on

作者： Jinling Su Heng Liu Liu Yang Key Lab of Information Coding & Transmission Southwest Jiaotong University Chengdu China

Specific emitter identification (SEI) refers to the technology of identifying specific emitter individuals by the RF fingerprint carried by the emitter transmitting signals. RF fingerprint is a hardware difference feature caused by the nonlinearity and tolerance of the components inside the emitter, and can be used as the unique identification of the emitter. In this paper, we propose an emitter identification scheme based on convolutional neural network (CNN) via variational mode decomposition (VMD) and bimodal feature fusion. Firstly, four stray components of LoRa signals are extracted by VMD, which contain unintentional modulation features of the original signals. Then the time-frequency features (VMD-S) and temporal features (VMD-T) are extracted from the four stray components. Consequently, a CNN-based two-channel feature extraction network is built with an attention module and a bimodal feature fusion strategy which realizes the fusion of VMD-S and VMD-T. The experimental results show that the proposed SEI scheme achieves higher identification accuracy in comparison with the scheme without feature fusion at the low signal-to-noise ratio (SNR) region.

关键词： Radio frequency Time-frequency analysis Transmitters Modulation Fingerprint recognition Feature extraction Power electronics

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New opportunistic interference alignment in MIMO interference multiple access channels

New opportunistic interference alignment in MIMO interferenc...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Lijun Bai Li Hao Siyang Tang Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781509028610

In this paper, we investigate the K-cell multiple input multiple output (MIMO) interference multiple-access channel (IMAC) where opportunistic user scheduling and interference alignment (IA) are combined. For traditional opportunistic IA (OIA) scheme, without consideration on enhancing the effectiveness of the desired signal, each user calculates its beamforming vector only based on the singular value decomposition (SVD) of its total leakage of interference (LIF), which leads to the performance deterioration in terms of both the achievable average sum rate and bit error rate (BER). Focusing on K-cell MIMO IMAC, we propose the signal to LIF ratio (SLIR) OIA in this paper, the beamforming vector design criterion of which takes both LIF and desired signal into consideration. Compare with the existing OIA scheme, the proposed SLIR-OIA has the same order of magnitude in computational complexity. Applying the proposed SLIR-OIA algorithm to both perfect and limited feedback scenarios, we evaluate the sum rate and BER performance through simulations, the results of which show that the proposed SLIR-OIA scheme outperforms the traditional OIA scheme significantly.

关键词： Interference Array signal processing MIMO Measurement Algorithm design and analysis Feeds Bit error rate

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Transmit Antenna Selection in Space Shift keying Modulation

Transmit Antenna Selection in Space Shift Keying Modulation

引用

IEEE Vehicular Technology Conference

作者： Enzhi Zhou Li Hao Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781467363365

In this paper, transmit antenna selection (TAS) is applied to space shift keying (SSK) modulation to obtain diversity gain. The receiver selects a transmit antenna subset in each transmission block according to the channel state information (CSI) and sends the subset index to the transmitter through feedback. Several antenna selection schemes are evaluated for SSK from perspectives of performance, feedback overhead and complexity. A greedy transmit antenna selection scheme is proposed to reduce the computation complexity, which shows almost the same performance as exhaustive search. In the special case that the number of active antennas equals two, an antenna selection scheme with one transmit antenna fixed (Fix-1 scheme) is proposed to reduce the amount of feedback, whose exact bit error ratio (BER) performance is derived. Through asymptotic BER analysis we show that Fix-1 scheme has the same diversity order as exhaustive search.

关键词： TAS SSK CSI transmitting antennas STIFF SKIN SYNDROME transmission block exhaustive search BER analysis shift keying Feedback

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Principal component analysis based multiplexing solution for MIMO systems in high-speed railway

Principal component analysis based multiplexing solution for...

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International Workshop on High Mobility Wireless Communications (HMWC)

作者： Xiangle Cheng Xuming Fang Key Lab of Information Coding & Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781479956470

In order to enable reliable spatial multiplexing transmission, an environment with rich scatterers is often required, which is not equipped in most railway running environment. So the MIMO channel with sparse scatterer and dominant LOS component in high-speed railway scenario is usually strongly spatial correlated and often fails to support a multiplexing transmission link. While it is actually not a pure LOS environment even in open plain or on a viaduct according to the existing engineering measurements. Hence, in high-speed railway environment, it is still highly possible to support partial multiplexing transmission if configuring a reasonable antenna placement structure with adequate antennas along the train body in the future. To target this problem, this paper investigates the solution of reconstructing the highly correlated railway channel into an equivalent channel with less correlation using the method of principal component analysis and thereon proposes an optimal partial multiplexing transmission solution to improve the link performance. With the proposed solution, the capacity in the distant area from the base station is verified to be significantly improved and that in close distance area is maintained meanwhile the condition number is reduced to be less than 10 to meet the required link quality.

关键词： MIMO Transmitting antennas Correlation Receiving antennas Multiplexing Fading Rail transportation

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