摘要
基于空时分组码的正交频分复用技术(OFDM-STBC)是多天线多载波技术,将自适应功率分配技术用于OFDM-STBC,如何在载波和天线间分配能量是个关键问题。将待发射的信息分配到最有利的天线上传输接着利用载波间功率分配的算法进行载波间的功率分配,该算法的目标是使误码率最小。通过量化信道衰落简化了功率分配算法实现;通过量化功率分配因子的方式提高了无线链路的利用率。仿真结果显示:在误码率取0.1%时,对于有4个子载波的系统,较传统的算法,此算法能带来5 dB的增益;随着系统载波数目的增加,性能进一步得到提高。
Space-time block coded orthogonal frequency division multiplexing （STBC-OFDM） is a multi-antenna and multi-carriers system. How to allocate power among antennas and carriers is a key problem when adaptive power allocation method is used to STBC-OFDM system. In this paper, a novel algorithm for allocation of power is proposed. The algorithm firstly selects the antenna with the least fading, then allocates the power to carriers to minimize the bit error rate （BER）. Comparing with the traditional power allocation algorithm, the power allocation weights is quantized to improve the utilization of wireless channel. Additionally, by the quantization of channel fading, the allocation power algorithm is easily applied. When the number of subcarriers are equal to 4, simulation results show that there is 5dB gain by comparing with the traditional method at the BER of 0.1%. Moreover, the performance of the algorithm is improved as the number of the carriers increase.
出处
《电波科学学报》
EI
CSCD
北大核心
2007年第3期453-457,共5页
Chinese Journal of Radio Science
