OFDM系统中子信道的自适应比特、功率分配  

Adaptive Bit and Power Allocation for Subchannels in OFDM Systems

作　　者：赵丽丹[1] 朱琦[1] 酆广增[1] 

机构地区：[1]南京邮电学院通信工程系,南京210003

出　　处：《通信技术》2003年第7期32-34,共3页Communications Technology

基　　金：受863项目资助;项目编号2002AA123046

摘　　要：研究了一种改进的OFDM系统中子信道的自适应比特、功率分配算法。该算法可适用于多径频率选择性衰落信道,它根据信道的瞬时特性,动态地为OFDM系统的各子信道分配传输比特数和发送功率。依据不同的分配准则,采用了MA和RA两种优化算法。仿真结果表明,采用自适应技术可以大大提高OFDM系统的性能。This paper proposes adaptive bit and power allocation algorithms for subchannels in OFDM systems, which can be used over multipath frequency selective fading channels. According to the instantaneous channel characteristics, the adaptive algorithms assign the bits and power to the subchannels. The margin adaptive (MA) optimization algorithm and the rate adaptive (RA) optimization algorithm are proposed. The simulation result shows that system performance will be improved with adaptive allocation.

关 键 词：正交频分复用 自适应分配 边值自适应优化 速率自适应优化 

分 类 号：TN91[电子电信—通信与信息系统]