利用特征信道分割方法优化 - 吉林大学学报.pdf

Vol. 34 No.4 第 34 卷第4 期 吉林大学学报(工学版) Oct. 2004 2004 年 10 月 Journal of Jilin University (Engineering and Technology Edition) 文章编号: 1671 - 5497(2004 )04 - 0622 - 05 利用特征信道分割方法优化 MIMO-OFDM 系统吞吐量 宋显鹏，王树勋，孙晓颖 (吉林大学通信工程学院，吉林长春 130022) 摘 要:提出了一种应用自适应调制，优化 MIMO-OFDM 系统吞吐量的新方法一一特征信道 分割方法。对于一个有 M 个发射天线及N 个接收天线的系统，通过使用子信道的预编码和 解码，可以将每个子信道分解成 min(M ， N)个并行的特征信道。将这些并行的特征信道按照 特定的方式分成多个组，每个组内的特征信道被分配相同的速率，从而使信道吞吐量达到最 大。仿真结果表明:该方法的吞吐量和误码率性能与理想情况(每个子信道分配不同的速率) 基本相同，但是却能大大降低系统的运算复杂度。 关键词:通信技术;MIMO-OFDM;特征子信道:自适应调制 中固分类号:TN929.5 文献标识码:A Throughput optimization implementation scheme for MIMO-OFDM systems with adaptive rate modulation SONG Xianpeng , WANG Shuxun , SUN Xiaoying ( College 0/ Communication Engineering , Jilin University , Changchun 130022 , China) Abstract:A novel implementation scheme for optimizing throughput called eigen channel partition method was proposed using adaptive rate modulation for MIMO-OFDM systems. In this scheme sub-channels precoders and decoders jointly partition each frequency bin into a set of min( M , N) paral1el eigen channels for M transmit and N receive antennas. All the parallel eigen channels are divided into groups with same assigned rate to al1 the channels within each group in order to maximize system throughput. Simulation results show the computation complexity is greatly reduced and the throughput and BER performance of the proposed scheme closely approaches to those of conventional method or the ideal case on the channel-by-