After that the techniques of channel coding, synchronization and RAKE receiver were investigated,the method using a Willard sequence for synchronization of system and acoustic channel multipath time-delay estimate was found.

• 论文还对信道编码技术、扩频系统的同步技术和RAKE接收技术进行了研究，提出了一种用威拉德序列做同步头来完成系统同步定时及信道多径时延估计的方案。