一种基于最小误码率的OFDM自适应比特及功率分配算法

OFDM自适应调制技术根据各子载波在频率选择性衰落信道中不同的瞬时增益，动态地分配数据比特和发射功率，可以优化系统性能，提高频谱效率。该文主要研究OFDM系统发射功率和传输比特数不变时误码率最小化的自适应(MA)算法。提出一种以注水门限为迭代参数的MA算法，并引入有记忆步长迭代法，提高算法的稳定性。仿真结果表明，与过去的算法相比，该算法能以较低的复杂度获得更好的性能。

A Minimum Bit Error Rate Loading Algorithm for OFDM Systems

An efficient power and bit allocation algorithm is proposed for wireless OFDM systems aiming at minimization of the bit error rate under the constraint of total transmit power and data rate. The algorithm is based on the water-filling approach and adopts a new iterative method to improve its stability. Simulation results show the proposed algorithm has a better performance and a lower computational complexity compared to the previous ones.