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

作     者：Yuda, Yasuaki Hiramatsu, Katsuhiko Hoshino, Masayuki Homma, Koichi 

作者机构：Matsushita Elect Ind Co Ltd Yokosuka Kanagawa 2390847 Japan Tokai Univ Grad Sch Engn Hiratsuka Kanagawa 2591292 Japan 

出 版 物：《IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES》 (电子信息通信学会汇刊：电子学、通信及计算机科学基础)

年 卷 期：2007年第E90A卷第11期

页      面：2413-2422页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：OFDM MIMO link adaptation codeword pre-coding SIC 

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.