A study on link adaptation scheme with multiple code words for spectral efficiency improvement on OFDM-MIMO systems

被引：0
作者：
Yuda, Yasuaki [1 ]
Hiramatsu, Katsuhiko
Hoshino, Masayuki
Homma, Koichi
机构：
[1] Matsushita Elect Ind Co Ltd, Yokosuka, Kanagawa 2390847, Japan
[2] Tokai Univ, Grad Sch Engn, Hiratsuka, Kanagawa 2591292, Japan
来源：
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES | 2007年 / E90A卷 / 11期
关键词：
OFDM; MIMO; link adaptation; codeword; pre-coding; SIC;
D O I：
10.1093/ietfec/e90-a.11.2413
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this paper, we propose the stream multiplexing scheme to achieve the high spectral efficiency on OFDM-MlMO system considering (a) the effects of the inter-stream interference suppression techniques, (b) the influence of the quality measurement in the receiver to select the modulation and coding scheme (MCS) and (c) the influence of the signaling overheads to the spectral efficiency. Two kinds of schemes for stream multiplexing, namely Multiple CodeWord (MCW) and Single CodeWord (SCW) are investigated and compared. In the simulations, we assume real channel estimation for SlNR measurement for MCS selection and we compare the schemes with the spectral efficiency taking into account overheads. In consequence, it is presented that MCW can achieve the higher efficiency than SCW in the middle to high SINR region. Moreover, in 4 x 4 antenna configuration, a 2CW-MCW scheme where 2 codewords mapped onto 4 streams according to SINR of each streams is proposed. The scheme gives higher throughput by improving the MCS selection in the low SINR region due to increase of data length per a codeword and by reducing the signaling overhead due to the decrease of the number of codewords. As a result, the proposed scheme achieves spectral efficiency improvement in whole SINR region.
引用
收藏
页码：2413 / 2422
页数：10
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