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Performance Enhancement of Probabilistically Shaped OFDM Enabled by precoding technique in an IM-DD System

JOURNAL OF LIGHTWAVE TECHNOLOGY 2019年第24期37卷 6063-6071页

作者： Ma, Jie Chen, Ming Wu, Kaiquan He, Jing Hunan Univ Coll Comp Sci & Elect Engn Changsha 410082 Peoples R China Hunan Normal Univ Sch Phys & Elect Changsha 410081 Peoples R China

Probabilistically shaped orthogonal frequencydivision multiplexing (PS-OFDM) signal is proposed and experimentally demonstrated in a low-cost intensity-modulation and direct-detection (IM-DD) system for optical access networks. The concatenation of constant composition distribution matcher (CCDM) and low-density parity-check (LDPC) code sequentially implements probabilistic amplitude shaping (PAS) and channel coding. Thanks to the precoding scheme, all data subcarriers can be treated equally by one optimized probabilistic distribution. Experimental results demonstrate that constant amplitude zero autocorrelation sequence (CAZAC) precoding can offer optimal performance compared to orthogonal circulant transform (OCT) precoding and discrete Fourier transform spread (DFT-spread) in terms of increasing generalized mutual information (GMI) and reducing PAPR. Moreover, probabilistically-shaped 64-QAM OFDM signal can provide shaping gains of 1.04/0.94/0.64 dB at 4.0/3.6/3.0 bits/QAM symbol compared to traditional 64-QAM OFDM signal. Meanwhile, compared to traditional 16-QAM OFDM, it can offer shaping gains of 1.64/0.64 dB at 3.6/3.0 bits/QAM symbol. In addition, net data rate ranging from 32.66 to 43.55-Gb/s over 20-km single mode fiber (SMF) can be achieved by only adjusting the probabilistic distribution.

关键词： Intensity-modulation and direct-detection (IM-DD) optical access networks precoding technique Probabilistically-shaped orthogonal frequency-division multiplexing (PS-OFDM)

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Hybrid precoding with phase shifter reduction for 5G massive antenna multi-user systems in millimetre wave

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IET COMMUNICATIONS 2019年第16期13卷 2429-2435页

作者： Zhao, Xiongwen Zhang, Yu Geng, Suiyan Du, Fei Fu, Zihao Zhou, Zhenyu North China Elect Power Univ Sch Elect & Elect Engn Beijing 102206 Peoples R China

In this study, the performances of commonly used precoding schemes are evaluated based on channel measurements carried out at 28GHz in a railway station for a massive antenna system configuration. And a hybrid precoding algorithm for a fifth generation (5G) multi-user antenna system is proposed and its performance is evaluated based on real measured channels. Specifically, An upper bound for achievable sum-rate of phased zero forcing (PZF) algorithm is derived and a precoding technique by reduction of phase shifters (PSs) named reduced-PZF (RPZF) is proposed, which can obviously reduce power consumption in hybrid precoding systems. In addition, the authors give the closed-form expression for achievable sum-rate when RPZF is used. There are no requirements in the authors' proposed scheme with complicated matrix decomposition and optimisation techniques. The simulation results show that it is possible to reduce 30 and 50% of the PSs by using the proposed hybrid precoder with better system performance in the line-of-sight (LoS) and non-LoS scenarios, respectively. In addition, the digital PSs with 3 bits low resolution can achieve the similar performance when using analogue ones.

关键词： precoding MIMO communication antenna arrays wireless channels multi-access systems phase shifters similar performance phase shifter reduction 5G massive antenna multiuser systems millimetre wave commonly used precoding schemes channel measurements 28 GHz railway station massive antenna system configuration hybrid precoding algorithm fifth generation multiuser antenna system measured channels achievable sum-rate phased zero forcing algorithm precoding technique phase shifters PSs reduced-PZF RPZF hybrid precoding systems authors complicated matrix decomposition optimisation techniques hybrid precoder system performance frequency 28 0 GHz word length 3 0 bit

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Adaptive precoding scheme with efficient joint processing for downlink coordinated multi-point transmission system

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ELECTRONICS LETTERS 2015年第24期51卷 2055-2056页

作者： Ryu, Young-Su Jung, Su-Hyun Song, Hyoung-Kyu Sejong Univ uT Commun Res Inst Seoul South Korea

An adaptive precoding scheme with efficient joint processing (JP) is proposed for the downlink coordinated multi-point transmission system. This scheme selects one JP technique and one precoding technique according to channel state information from the user equipment. The system-level simulation results show that the bit error rate performance of the proposed scheme is better than that of the conventional scheme.

关键词： adaptive codes precoding radio links radio equipment error statistics radio networks telecommunication traffic adaptive precoding scheme joint processing downlink coordinated multipoint transmission system JP precoding technique channel state information user equipment bit error rate performance

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A Simple Linear Precoder for Selection-Type Cooperative MIMO Systems

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IEEE COMMUNICATIONS LETTERS 2010年第4期14卷 306-308页

作者： Yoo, Byungwook Park, Wonwoo Lee, Kyu Ha Lee, Chungyong Yonsei Univ Dept Elect & Elect Eng Seoul 120749 South Korea

We propose a simple linear precoder for selection-type cooperative multiple-input multiple-output communication systems. After a received symbol vector is detected at destination, the link which has the highest minimum receive substream signal-to-noise-ratio between the source-destination link and the source-relay-destination link is selected as a transmission link. Under the assumption that the full channel state information is available at every node, source and relay precodering scheme, which is suitable for zero-forcing detector, is proposed. Simulation results show that the performance of the proposed relaying technique is comparable to that of the near-optimal linear protocol while offering lower computational complexity.

关键词： Cooperative MIMO communication systems precoding technique ZF detector minimum receive substream SNR

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MIMO techniques for Carrierless Amplitude and Phase Modulation in Visible Light Communication

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IEEE COMMUNICATIONS LETTERS 2018年第5期22卷 974-977页

作者： Akande, Kabiru O. Popoola, Wasiu O. Univ Edinburgh Sch Engn LiFi Res & Dev Ctr Inst Digital Commun Edinburgh EH9 3JL Midlothian Scotland

In this letter, multiple-input multiple-output (MIMO) techniques are proposed to improve the spectral efficiency and bit error rate (BER) performance of the conventional carrierless amplitude and phase modulation (CAP) in visible light communication. Analytic frameworks for both multiplexing and diversity MEMO techniques are developed for CAP. The analytical expressions in line-of-sight (LOS) propagation are validated via simulation. A preceding technique is further applied to improve the power efficiency of the multiplexing scheme resulting in a signal-to-noise ratio (SNR) gain of 28.5 dB.

关键词： Visible light communication (VLC) multiple-input multiple-output (MIMO) carrierless amplitude and phase modulation (CAP) precoding technique

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Low complexity user scheduling algorithm for energy-efficient multiuser multiple-input multiple-output systems

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IET COMMUNICATIONS 2014年第3期8卷 343-350页

作者： Sun, Chuiqiang Ge, Jianhua Li, Jing Zhu, Bin Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China

In downlink multiuser multiple-input multiple-output (MU-MIMO) systems, block diagonalisation (BD) is a well-known precoding technique that eliminates inter-user interference. The number of simultaneously supportable users with BD is limited by the number of base station transmit antennas and the number of user receive antennas. Traditional MU-MIMO scheduling algorithms focus on sum capacity. However, these user scheduling algorithms might not be optimal with respect to energy efficiency. Here, the authors consider the energy-efficient MU-MIMO scheduling that maximises the energy efficiency. The brute-force search for the optimal user set, however, is computationally prohibitive. Therefore they propose a low-complexity user scheduling algorithm for energy-efficient MU-MIMO systems. They first obtain an approximation expression for the energy efficiency by utilising the upper bound of the MU-MIMO system capacity. Then they show that the maximum energy efficiency can be achieved if the scheduling user set is selected to obtain the largest matrix volume. The numerical results show that the proposed algorithm achieves a good tradeoff between energy efficiency and computational complexity. They also consider the problem of maintaining fairness among users, and propose a simplified proportional fair (PF) scheduling algorithm.

关键词： communication complexity energy conservation intercarrier interference MIMO communication precoding receiving antennas search problems transmitting antennas telecommunication power management energy-efficient multiuser multiple-input multiple-output systems downlink multiuser multiple-input multiple-output systems block diagonalisation BD precoding technique inter-user interference base station transmit antennas user receive antennas sum capacity wireless communications energy-efficient MU-MIMO scheduling algorithms brute-force search optimal user set low-complexity user scheduling algorithm energy-efficient MU-MIMO systems approximation expression MU-MIMO system capacity maximum energy efficiency matrix volume computational complexity user fairness degree proportional fair scheduling algorithm PF scheduling algorithm

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Performance Impact of Imperfect CSI on Spatial Hiding Anti-Jam Communications 33

Performance Impact of Imperfect CSI on Spatial Hiding Anti-J...

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33rd Annual IEEE Military Communications Conference on Affordable Mission Success - Meeting the Challenge (MILCOM)

作者： Shahriar, Chowdhury Cole, Chad A. Clancy, T. Charles Virginia Tech Blacksburg VA 24061 USA Cerner Corp Kansas City MO USA

ISBN: (纸本)9781479967704

This paper explores the effect of imperfect channel state information (CSI) on spatial hiding anti-jam (AJ) communications technique. Recently a fundamental technique of hiding a signal is proposed that provides a precoding technique that allows a pair of two-antenna transceivers to communicate while being jammed intentionally by a malicious single-antenna node. The precoder uses a small amount of CSI to shape the signal to appear orthogonal to the jammer at the intended receiver. However, performance of the scheme depends on the quality of two estimated parameters -transceiver and jamming CSI. In practice, CSI estimation is always subject to error due to the presence of noise, statistical characteristics of wireless channel, and limitations of hardware. By modeling the CSI estimation error as independent complex Gaussian random variables, analytical model for post-processing residual interference is derived in closed-form for both transceiver and jamming CSI estimation error. In addition, a lower bound for jammers interference as a function of jamming CSI estimation error is derived. Through simulation we demonstrate the effect of imperfect CSI on spatial hiding anti-jam and validate the analytical model as well.

关键词： Gaussian processes antenna arrays interference suppression jamming precoding radio transceivers statistical analysis wireless channels AJ communication CSI estimation error Gaussian random variables analytical model imperfect CSI impact imperfect channel state information jammer interference malicious single-antenna node post-processing residual interference precoding technique receiver signal hiding technique signal shaping spatial hiding antijam communication two-antenna transceiver wireless channel statistical characteristics Channel estimation Decoding Estimation error Jamming MIMO Receivers Transceivers

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Improved diversity on the uplink of multi-user MIMO systems

Improved diversity on the uplink of multi-user MIMO systems

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8th European Conference on Wireless Technology (ECWT 2005)

作者： Stankovic, Veljko Haardt, Martin Tech Univ Ilmenau Commun Res Lab D-98684 Ilmenau Germany

ISBN: (纸本)296005511X

In this paper we analyse the performance of a MIMO receive algorithm that represents a modification of a precoding technique. Thereby we demonstrate the flexibility of these precoding techniques and investigate the possibility of applying the same algorithms at the base station (BS)/access point (AP) for both downlink (DL) and uplink (UL) MIMO processing. Unlike previously reported results where all users in the system are equipped with only one antenna, we investigate a more general case where users can be equipped with an arbitrary number of antennas. By combining one of the previously proposed precoding algorithm and space-time codes we are able to provide an SNR gain of more than 3 dB compared to V-BLAST.

关键词： MIMO systems diversity reception precoding radio links space-time codes wireless channels V-BLAST access point base station downlink channel improved diversity multiuser MIMO systems precoding technique uplink channel

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A LOW COMPLEXITY DECISION FEEDBACK EQUALIZER FOR SINGLE-CARRIER AMPLIFYFORWARD MIMO RELAY SYSTEM 5

A LOW COMPLEXITY DECISION FEEDBACK EQUALIZER FOR SINGLE-CARR...

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2016 5th IEEE International Conference on Network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Yang Liu Chao Dong Zhiqiang He Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

In this paper,we introduce ablock iterative frequency domain decision feedback equalizer with noise prediction(NP-BI) for single-carrier(SC) multiple input multiple output(MTMO) relay ***,we derive the minimum mean-squared error(MMSE) equalizer at the destination *** the decision feedback equalizer coefficients can be calculated according to the error covariance matrix of the MMSE equalizer and the equivalent channel frequency-domain(FD) ***,we combine the spatial precoding matrix with the decision feedback equalizer at the source node,which performs better than the frequency domain equalization with noise prediction(FDE-NP),especially when the number of antennas is *** addition,NP-BI has a lower computational complexity than FDE-NP.

关键词： FD decision feedback equalizer MIMO relay system precoding technique

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Anti-pilot Pollution in Massive MIMO Systems Research and Implementation

Anti-pilot Pollution in Massive MIMO Systems Research and Im...

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2020 Cross Strait Radio Science and Wireless Technology Conference

作者： Zhan, Ai-Yun Ye, Meng-Qiu Hua, Shan-Shan Wang, Rong-Ping Zhang, Yue-Jin East China Jiaotong Univ Sch Info Engn Nanchang Jiangxi Peoples R China

ISBN: (纸本)9781728181813

Based on the background of Massive MIMO (Multiple-Input Multiple-Output) system, this paper focuses on whether precoding technology can effectively reduce the impact of pilot pollution, and a hybrid precoding scheme based on all-digital precoding and analog beamforming is proposed. The results show that the hardware complexity and cost of the system can be reduced effectively on the premise that the basic performance indexes are close.

关键词： Massive MIMO pilot pollution precoding technique hybrid precoding all-digital precoding

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