摘要
该文首先分析了多天线发射和接收(MIMO)的OFDM系统模型。然后针对在多径衰落信 道下, OFDM中一些深度衰落的子载波降低了系统性能。该文把一般多载波系统中的自适应比特功率分 配算法推广应用到多天线OFDM系统中。同时研究了自适应MIMO OFDM系统的频谱效率。仿真结 果表明,自适应比特功率分配提高了MIMO OFDM的误比特率性能和频谱效率。
The multiple antenna Orthogonal Frequency Division Multiplexing(OFDM) system model is analyzed in this paper. Considering that Multiple-Input Multiple-Output(MIMO) channel can be separated into parallel subchannels by means of the singular value decomposition, and deep faded subcarriers may degrade the OFDM system performance, the adaptive bit and power allocation for MIMO OFDM system are proposed. The analysis and simulation results show that the proposed adaptive MIMO OFDM improves bit error rate performance and spectral efficiency of the system.
出处
《电子与信息学报》
EI
CSCD
北大核心
2004年第3期416-420,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金重点项目资助课题(资助号: 60132010)
