In-Tunnel Multi-Ray Analysis for LOS V2V Links with Multiple Antennas

Space-time block (STB) coding has been an effective transmit diversity technique for combating fading recently. In this paper, a full-rate and low-complexity STB coding scheme with complex orthogonal design for multiple antennas is proposed, and turbo code is employed as channel coding to improve the proposed code scheme performance further. Compared with full-diversity multiple antennas STB coding schemes, the proposed scheme can implement full data rate, partial diversity and a smaller complexity, and has more spatial redundancy information. Moreover, using the proposed scheme can form efficient spatial interleaving, thus performance loss due to partial diversity is effectively compensated by the concatenation of turbo coding. Simulation results show that on the condition of the same system throughput and concatenation of turbo code, the proposed scheme has lower bit error rate (BER) than those low-rate and full-diversity multiple antennas STB coding schemes.

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Joint Clustering and Precoding for a Downlink Non-Orthogonal Multiple Access System with Multiple Antennas

2016 IEEE 84th Vehicular Technology Conference (VTC-Fall) ◽

10.1109/vtcfall.2016.7881056 ◽

2016 ◽

Author(s):

Chin-Liang Wang ◽

Jyun-Yu Chen ◽

Siu-Hang Lam ◽

Pei Xiao

Keyword(s):

Multiple Access ◽

Multiple Antennas ◽

Access System ◽

Multiple Access System

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An Improved MMSE Pre-Coding Method for the Downlink Multi-User MIMO System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.457-458.600 ◽

2012 ◽

Vol 457-458 ◽

pp. 600-606

Author(s):

Xian Kun Gao ◽

Yan Cui ◽

Ji Lai Ying ◽

Yong Chang Yu

Keyword(s):

Numerical Simulations ◽

Mimo System ◽

Multiple Antennas ◽

Poor Performance ◽

Inversion Method ◽

Block Diagonalization ◽

Coding Method ◽

Diagonalization Method ◽

Noise Ratio ◽

Theoretical Analyses

Recently many practical downlink multi-user MIMO linear pre-coding methods have been proposed, such as the channel inversion method and the block diagonalization method (BD). Considering the channel inversion method based on MMSE criterion (MMSE-CI) which is confined to a single receives antenna case, the BD has more advantages in multiple antennas cases, however, it has poor performance at the low and medium SNR regime on account of no consideration on the noise. In this paper, an improved MMSE pre-coding method is proposed with multi receive antennas of each user. Based on MMSE-CI, the cooperation of multiple antennas is adopted to further suppress the residual interference during designing the pre-coding matrix, which could increase the signal-to- interference-plus-noise ratio (SINR) at each user’s receiver. The proposed method obtains a better performance than the MMSE-CI and the BD algorithms, and its effectiveness is validated by both theoretical analyses and numerical simulations.

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