水声信道的时变相位起伏使得实现可靠的相位跟踪比较困难, 从而造成基于相位检测的 水声通信接收机结构复杂。提出基于FSK 调制的直接序列扩频(DSSS2 FSK) 水声通信系统。-Underwater acoustic channel disguised bit of time to achieve reliable phase fluctuations make tracking more difficult, resulting in detection based on phase

多径衰落信道中M进制直接序列扩频系统RAKE接收机性能分析-Multipath fading channels M-ary direct sequence spread spectrum system RAKE receiver performance analysis