摘要：This paper designs an underwater acoustic communication system based on tamed spread spectrum and Frequency Hopping Multiple Access (fhma) for multiple underwater vehicles. In this system, multiple underwater vehicles can communicate with the console on the water surface simultaneously successfully. The communication system is com-posed of tamed spread spectrum modulation and demodulation, frequency hopping modulation and demodulation with synchronization function, 4FSK modulation and demodulation and Rake Receiver. In order to make the system more feasible, underwater channel and the effect of user number on Bit Error Ratio (BER) are also taken into account. The simulation results indicate that it is feasible to use this system to accomplish underwater communication reliably for multiple users due to the low BER.

摘要：本文首先按ＩＴＵ－Ｒ报告介绍了数字集群的总目标、业务类型、信道设计和接入技术，并列表比较了７种系统技术体制。为优选适合我国国情且技术先进的体制，提出了性能价格比、标准公开性、技术先进性、系统灵活性及环境适应性等五项优选准则。