基于子带的自适应比特和功率分配算法的研究  

Research of adaptive bit and power loading according to subband

作　　者：高欢芹[1] 朱艳[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《西安邮电学院学报》2008年第3期17-20,32,共5页Journal of Xi'an Institute of Posts and Telecommunications

基　　金：南京邮电大学青蓝计划项目(NY206061)

摘　　要：对于具有几百个甚至上千个子载波的OFDM系统,基于每个子载波模式的自适应比特和功率分配,系统的信令负荷非常庞大,而基于子带的自适应比特和功率分配算法能够有效地解决这个问题,以较小的性能增益的损失为代价,大大的降低系统的信令负荷。本文提出了一种基于子带的比特和功率分配算法,并采用了IMT-2000 ve-hicular A信道模型进行了仿真。仿真结果表明所提出的算法能够获得较好的BER性能;如果每个子带含有4个子载波,则系统的信令负荷减少75%,当BER为10-3时,信噪比损失小于1dB。For OFDM systems of hundreds or thousands subcarriers with the adaptive bit and power loading according to each subcarrier, the signaling overhead will be awfully large. However, the adaptive bit and power loading according to ＂subband＂ is an effective solution to this problem, with which the signaling overhead is expected to be dramatically decreased at the cost of some performance gain loss. In this paper, we present an algorithm of subband bit and power loading and also simulate it with IMT - 2000 vehicular A channel model. The simulation results show that our algorithm can achieve good BER performance and the signaling overhead is reduced by 75 % at the cost of performance loss less than i dB, if the number of subcarriers per subband is 4 when the BER is 10^-3.

关 键 词：子带 自适应比特和功率分配 OFDM 

分 类 号：TN911.23[电子电信—通信与信息系统]