自适应比特分配算法在高速遥测系统中的应用

摘要

A simple ,fast adaptive modulation algorithm for OFDM system is proposed. After finishing the channel allocation and estimating channel parameters, an adaptive bit allocation method was proposed to allocate the bit and power of sub channel dynamically, which made the total bits of per symbol maximum. So it enhanced the channel utilization and data transfer rate and met the requirement of transmission rate and BER of high-speed telemetry system. Simulation results show that, compared with the fixed modulation method. the adaptive hits allocation algorithm is relatively simple. It reduces the system ' s transmission power, and it ' s BER performance is significantly better than that of equal bit allocation algorithm.%提出了一种简单、快速的正交频分复用(OFDM)系统的自适应调制算法.该算法在子信道分配已经完成的前提下,通过信道参数的估计,动态地分配子信道上的比特和功率,使得发送的每个符号的总比特数最大,从而提高信道的利用率及数据传输速率,满足了高速遥测系统所要求的传输速率及误码率.仿真结果表明,与等比特分配算法相比,本自适应比特分配算法相时简单,降低了系统的传输功率,其误码率性能明显好于等比特分配算法.