正交频分复用传输速率最大化自适应水声通信算法研究

Research on Self-adjusting OFDM Underwater Acoustic Communication Algorithm for Transmission Rate Maximization

该文在对正交频分复用(OFDM)水声通信速率最大化问题建模基础上,对注水算法的运算量进行了合理简化,实现了对子载波初始能量的快速分配。针对固定判决门限离散比特分配算法存在的码元能量严重浪费和速率损失问题,提出了基于贪婪的比特分配方案,以较小的计算量代价实现了OFDM通信速率的显著提高。研究表明,在压缩信道编码的不完全信道估计下,新算法仍具有良好的通信速率及误码率性能,适用于时变水声信道。

Based on the modeling of transmission rate maximization problem for Orthogonal Frequency Division Multiplexing（OFDM） underwater acoustic communication, the computing amount for water-filling algorithm is reduced reasonably, which realizes rapid assignments for sub-carriers＇ initial energy. To deal with the serious waste of symbol energy existing in the bit assigning algorithm based on fixed threshold, the new greedy algorithm is brought forward, which improves the OFDM transmission rate remarkably with less cost of additional calculation.Results show that the new algorithm behaves favorable properties of transmission rate and Bit Error Rate（BER）even with incomplete channel estimation information suitable for time-variant underwater acoustic channel.