检索结果-内蒙古大学图书馆

Spectrum efficiency analysis of signal alignment-based beamspace millimetre wave MIMO-NOMA systems

IET COMMUNICATIONS 2020年第5期14卷 818-829页

作者： Salem, Ahmed Abdelaziz Benaya, A. M. El-Rabaie, Sayed Shokair, Mona Menoufia Univ Fac Elect Engn Menoufia 32952 Egypt

Non-orthogonal multiple access (NOMA) has been integrated with beamspace multi-input multi-output (MIMO) to enhance system spectrum efficiency (SE) by serving more than one user per dedicated radio frequency (RF) chain. However, balancing the system performance with significant RF reduction is still challenging. In this study, the authors propose beamspace MIMO-NOMA system based on signal alignment (SA) concept, where they will be able to tackle the issue of hardware complexity with a significant performance. Spectrum and energy efficiencies are analysed through two main stages. First, the excess degrees-of-freedom of beamspace MIMO-NOMA are exploited by SA to suppress the inter-beam/pair interference through designing user detection vectors and precoding matrix. Accordingly, a significant RF-chains reduction is provided. Second, power allocation coefficients are evaluated upon the optimal SE in order to mitigate intra-beam/pair interference. Moreover, the authors derive a tight closed formula for optimal SE based on Karush-Kuhn-Tucker analysis, which is validated by a heuristic-based optimal solution. Simulation results show a superior performance gain over orthogonal multiple access technique. Furthermore, the Monte-Carlo numerical solution depicts the marginal performance gap between the analytical and heuristic-based optimisation approach. This confirms the accuracy and rigidity of the proposed system.

关键词： optimisation antenna arrays MIMO communication precoding Monte Carlo methods spectrum efficiency analysis signal alignment-based beamspace MIMO-NOMA systems beamspace concept millimetre wave multiinput multioutput hardware complexity required radio frequency chains system capacity RF chains user numbers nonorthogonal multiple access system spectrum efficiency dedicated RF chain system performance RF reduction authors propose beamspace MIMO-NOMA signal alignment concept energy efficiencies excess degrees-of-freedom user detection vectors precoding matrix significant RF-chains reduction optimal SE Karush-Kuhn-Tucker analysis heuristic-based optimal solution superior performance gain orthogonal multiple access technique marginal performance gap analytical based optimisation approach heuristic-based optimisation approach

来源：评论

学校读者我要写书评

暂无评论

Secrecy precoding in MIMOME wireless communication system under partial CSI

引用

IET COMMUNICATIONS 2020年第13期14卷 2202-2209页

作者： Dong, Runze Wang, Buhong Cao, Kunrui Li, Xia Air Force Engn Univ Sch Informat & Nav Xian 710077 Peoples R China Natl Univ Def Technol Sch Informat & Commun Xian 710106 Peoples R China

In this study, a precoding scheme which is called singular value decomposition and null space (SVDNS) based scheme is proposed to enhance physical layer security of a multiple-input multiple-output multiantenna eavesdropper (MIMOME) system. Under the partial channel state information (CSI) of the eavesdropper, the precoding matrix for the information bearing signal is constructed firstly via SVDNS-based scheme to acquire a compromise between improving performance of the main channel and impairing that of the wiretap channel. Then the optimal power allocation over subchannels formed by precoding matrix is obtained through solving the secrecy rate maximise problem to further improve secrecy performance. After that, under the scenario that CSI of the wiretap channel is less knowable, precoding matrix for artificial noise (AN) is proposed via SVDNS-based scheme, and then the optimal power allocation between the information bearing signal and AN is obtained while optimal power allocation over subchannels is solved subsequently. Simulation results show that the SVDNS-based scheme with optimal power allocation achieves a higher secrecy rate than the existing schemes, and the SVDNS-based scheme with AN aiding could make up for the performance degradation of it without AN in the situation that CSI of the wiretap channel is more unknowable.

关键词： MIMO communication antenna arrays optimisation singular value decomposition precoding radio transmitters wireless channels telecommunication security secrecy precoding MIMOME wireless communication system partial CSI precoding scheme partial channel state information precoding matrix information bearing signal SVDNS-based scheme impairing wiretap channel optimal power allocation secrecy rate maximise problem secrecy performance singular value decomposition and null space based scheme multiple-input multiple-output multiantenna eavesdropper system

来源：评论

学校读者我要写书评

暂无评论

Sparsity-based MIMO interference suppression technique in the presence of imperfect channel state information

引用

IET COMMUNICATIONS 2019年第19期13卷 3201-3206页

作者： Sedghi, Rana Azghani, Masoumeh Sahand Univ Technol Dept Elect Engn Tabriz Iran

In this study, sparsity-based precoding schemes have been suggested to suppress the interference and improve the energy efficiency of a massive multiple-input multiple-output (MIMO) system when imperfect channel state information is available. To this goal, the sparsity and joint sparsity properties have been imposed on the precoding matrix for the purpose of boosting the energy efficiency or antenna selection. Moreover, the authors have assumed that only a few of the user's channel vectors have been erroneously estimated in the transmitter side. Hence, the channel estimation error matrix has been modelled as a joint sparse matrix. Adding the maximum transmission power constraint, the authors estimate the precoding matrix through solving a convex optimisation problem. Various simulation scenarios have been conducted, which confirm that the proposed precoding schemes improve the energy efficiency in the massive MIMO system.

关键词： optimisation convex programming MIMO communication precoding channel estimation interference suppression wireless channels sparsity-based MIMO interference suppression technique imperfect channel state information sparsity-based precoding schemes energy efficiency massive multiple-input multiple-output system joint sparsity properties precoding matrix user channel estimation error matrix joint sparse matrix massive MIMO system

来源：评论

学校读者我要写书评

暂无评论

Two-Hop AF MIMO Relay System Optimization With Own Information From the Relay Node

引用

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2019年第4期67卷 930-945页

作者： Su, Qiao Rong, Yue Army Engn Univ PLA Coll Commun Engn Nanjing 210007 Jiangsu Peoples R China Curtin Univ Sch Elect Engn Comp & Math Sci Bentley WA 6102 Australia

In this paper, we consider precoding matrices optimization for a new two-hop amplify-and-forward (AF) multiple-input multiple-output (MIMO) relay system, where in addition to forwarding the source signals, the relay node concurrently transmits its own signals to the destination node. Compared with conventional AF MIMO relay systems where the relay node only forwards the source signals, the transceiver optimization problem in the new system is more challenging to solve. We prove that for all Schur-concave objective functions, the optimal source and relay matrices jointly diagonalize the source-relay-destination and relay-destination channels, which simplifies the matrices optimization problem to a joint subchannel and power allocation problem with scalar variables. It is shown that to achieve a maximal sum mutual information (MI) of both the source and relay links, the strongest subchannels of the second-hop channel should be allocated for transmitting signals from the relay node. With additional quality-of-service constraints in terms of the lower bounds of the MI of both links, the optimal subchannel allocation problem is NP-hard. In this case, we propose a suboptimal channel allocation algorithm with a low computational complexity. For a given subchannel allocation, we develop a primal decomposition based algorithm to efficiently solve the power allocation problem. Simulation results show that compared with the exhaustive search based channel allocation approach and the general nonlinear programming based power allocation algorithm, the proposed subchannel and power allocation algorithms have a much lower computational complexity with only a small performance loss.

关键词： Amplify-and-forward MIMO relay power allocation precoding matrix quality-of-service subchannel allocation

来源：评论

学校读者我要写书评

暂无评论

precoding for Non-orthogonal Multiple Access with User Equipment Pairing

引用

WIRELESS PERSONAL COMMUNICATIONS 2018年第4期100卷 1645-1660页

作者： Li, Chi-Min Shen, Chen-Feng Natl Taiwan Ocean Univ Dept Commun Nav & Control Engn Room 9122 Pei Ning Rd Keelung 20224 Taiwan

Due to the tremendous throughput requirement, current spectrum allocation scheme of 4G long term evolution-advanced system can't satisfy the need for future communications applications. Hence, researches have proposed a non-orthogonal multiple access (NOMA) technique as a candidate for 5G access system recently. This paper proposes two precoding matrix selection methods for the NOMA system and also provides an appropriate user equipment (UE) pairing method for NOMA. Combining the UE pairing with the proposed precoding selection method, results show that system capacity for NOMA system can be further improved.

关键词： NOMA MIMO system precoding matrix UE pairing

来源：评论

学校读者我要写书评

暂无评论

Symbol Detection Aided Algorithm for Interference Alignment of Maximum Signal to Interference and Noise Ratio 2018

Symbol Detection Aided Algorithm for Interference Alignment ...

引用

2nd International Conference on Telecommunications and Communication Engineering (ICTCE)

作者： Jia, Guoqing Wang, Xinqi Wang, Lu Niu, Jinxue Qinghai Nationalities Univ Xining Qinghai Peoples R China

ISBN: (纸本)9781450365857

In the KxK multiple-input and multiple-output ( MIMO) interference alignment ( IA) communication system, for the problem of the traditional maximum signal to noise ratio ( MAX-SINR) algorithm's poorly performed, a symbol detection aided maximum signal to interference and noise ratio ( SDA-MAX-SINR) algorithm for IA is proposed. The algorithm improves the system's performance of the traditional MAX-SINR algorithm. First, the traditional MAX-SINR algorithm for IA is used to obtain the received signal. Next, based on the maximum signal to interference and noise ratio(SINR) criterion, the receiver interference suppression matrix and the transmitter precoding matrix are calculated by using the received signal directly. The simulation result shows that compared with the traditional MAX-SINR algorithm, the SDA-MAX-SINR algorithm has decreases the mean square error ( MSE) and the bit error rate ( BER) of the system effectively, improved the dependability of MIMO system obviously.

关键词： Interference alignment Maximum signal to interference and noise ratio Symbol detection assistant precoding matrix interference suppression matrix

来源：评论

学校读者我要写书评

暂无评论

Cooperative MIMO precoding for the LTE-A D2D communications

引用

WIRELESS NETWORKS 2017年第8期23卷 2545-2554页

作者： Li, Chi-Min Hung, Chen-Fang Natl Taiwan Ocean Univ Dept Commun Nav & Control Engn Room 9122 Pei Ning Rd Keelung 20224 Taiwan

In the current deployed 4G long term evolution-advanced (LTE-A) system, it adopts the precoding matrix to reduce the effect of the channel fading and improve the system capacity. Besides, a new technique of the device to device (D2D) communication enables the mobile devices using the LTE radio spectrum directly to communicate with each other. In this paper, two precoding selection methods are proposed for the multiple input multiple output (MIMO) D2D communications. The proposed methods adopt the subset and iterative concept to complete the precoding selection. Besides, a resource selection method is also provided for the D2D transmitter to select an appropriate spectrum resource among the nearby users served by the base station. Combined the resource selection with the proposed D2D precoding selection methods, both simulations and experiments demonstrate the excellent performance of the proposed methods.

关键词： D2D communication MIMO precoding matrix

来源：评论

学校读者我要写书评

暂无评论

IMPLEMENTATION OF THE PRECODER matrix INDICATOR SELECTION USING MMSE TRACE CRITERION FOR THE DOWNLINK TRANSMISSION IN LTE 41

IMPLEMENTATION OF THE PRECODER MATRIX INDICATOR SELECTION US...

引用

41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Chung, Chang-Han Liu, Tsung-Hsien Chu, Yuan-Sun Natl Chung Cheng Univ 168 Univ Rd Chiayi Taiwan

ISBN: (纸本)9781479999880

Based on the minimum mean squared error (MMSE) trace criterion, selection of the precoding matrix indicator (PMI) from the downlink codebook of the LTE system is considered in this paper. Due to the codebook of 16 member precoding matrices and up to 1200 sub-carriers in this MIMO-OFDM system, the PMI selection needs to compute matrix inversion of up to 19,200 matrices. To satisfy this required workload, LDLH decomposition is applied at the algorithmic level, and, pipeline matrix multiplication and backward substitution modules are used at the architectural level. The VLSI implementation results of our architecture under the TSMC 90 nm CMOS technology reveals that our architecture requires 124.6K gates at operating frequency 120 MHz. Thus, our designed architecture can finish the 19,200 matrix inversions in about 1.60 ms and meets the requirement of 2 ms period of periodic channel state report.

关键词： multiple input multiple output (MIMO) system precoding matrix LTE PMI report

来源：评论

学校读者我要写书评

暂无评论

Bstj 46: 7. September 1967: precoding for Multiple-Speed Data Transmission. (Chang, Robert W.)

引用

2016年

Bstj 46: 7. September 1967: precoding for Multiple-Speed Data Transmission. (Chang, Robert W.) by published by

关键词： (chang, bell system channel characteristics data data rate data transmission eye eye opening eye openings matrix multiple-speed openings partial response precoder precoding precoding matrix robert september subspace summing circuit system technical transmission transmitted vectors

来源：评论

学校读者我要写书评

暂无评论

Research on the Selection Algorithm of precoding matrix in TDD LTE

Research on the Selection Algorithm of Precoding Matrix in T...

引用

2011 IEEE 3rd International Conference on Communication Software and Networks(2011第三届通信软件与网络国际会议 ICCSN2011)

作者： Weihong Fu Zhiting Cui Fei Zhang Guo Yantao State Key Lab. of Integrated Service Networks Xidian University Xi'an China Science and Technology on Information Transmission and Dissemination in Communication Networks Labor

This paper presents an efficient method for calculating the precoding matrix Indicator (PMI) at a Long Term Evolution (LTE) User Equipment (UE).To solve problem of the high computational complexity in selection algorithm of precoding codebook for TDD LTE. A new selection algorithm based on singular value decomposition of channel matrix is presented. Our method reduces the computational complexity enormously by using the idea of channel average and maximizing effective power of transmitted signals. Then some simulations based on TDD-LTE downlink physical layer simulator are given. The simulations results show that the proposed algorithm greatly reduce the computational complexity compare to these two traditional algorithms while performance loss is very small, it is a good compromise of complexity and performance.

关键词： TDD-LTE Closed-loop MlMO precoding matrix Throughput Singular value decomposition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：