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Abstract
In this paper, the iterative Vertical-Bell-lab Layered Space-Time (V-BLAST) decoding algorithm of an Adaptive Modulation and Coding (AMC) system is proposed, and the corresponding MIMO scheme is analyzed. The proposed decoding algorithm adopts iteratively extrinsic information from a Maximum A Posteriori (MAP) decoder as an a priori probability in the two decoding procedures of the V-BLAST scheme of ordering and slicing in an AMC system. Furthermore, the performance of the proposed decoding algorithm is compared with that of a conventional V-BLAST decoding algorithm and a Maximum Likelihood (ML) decoding algorithm in the combined system of an AMC scheme and a V-BLAST scheme. In this analysis, each MIMO schemes are assumed to be parts of the system for performance improvement.
Highlights
To improve the throughput performance together with the development of the MIMO scheme, the AMC scheme has attracted considerable attention as the forerunner of next-generation mobile communication systems [1]
The results show that the approximate maximum throughput improvement for these three MIMO schemes is 421 Kbps, 545 Kbps, and 880 Kbps, respectively
It was found that the performance can be improved through application of the Selection Transmit Diversity (STD) as a MIMO diversity scheme
Summary
To improve the throughput performance together with the development of the MIMO scheme, the AMC scheme has attracted considerable attention as the forerunner of next-generation mobile communication systems [1]. The combination of a MIMO scheme and an AMC scheme can potentially improve the throughput performance. V-BLAST [3,4] was selected as the MIMO multiplexing scheme [5] and the turbo-coding [6] was chosen as the channel coding scheme of the AMC due to the complexity of the aforementioned combined system. The turbo-coding scheme with iterative decoding implies the use of parallel concatenated recursive systematic convolutional codes. Such a scheme is iteratively decoded with a Posteriori Probabilities (APP) algorithms for the constituent codes [7,8]. A performance analysis is offered here of AMC systems with several V-BLAST decoding algorithms including the turbo decoding algorithm used with MIMO. The proposed system utilizes a 2×2 MIMO channel using two transmitter antennas and two receiver antennas, a 4-2×2 MIMO channel applying a Selection Transmit Diversity (STD) scheme [11] that selects two antennas from four transmitter antennas, a 4×4 MIMO channel using four transmitter antennas and four receiver antennas, and a 8×8 MIMO channel using eight transmitter antennas and eight receiver antennas
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