| The research on underwater voice communication has been paid more and more attention with the human accelerated pace of development of the oceans. However, the communication technique used on the land can not be used in the underwater acoustic communication field, because of the limited bandwidth and the time-varying and space-variant nature of the underwater acoustic channel.Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier parallel transmission technology. It has become a research focus on the field of wireless communications in recent years, because of its excellent anti-multi-path performance and high spectrum efficiency. Its most notable feature is the high-speed transmission ability as well as the strong resistibility to the inter-symbol interference and selective fading channel. Therefore, the research and application on OFDM for the underwater acoustic communication have very high value in theory and practice.The underwater acoustic voice communication system based on AMBE-2000 and DSP (TMS320VC5509A) is designed in this paper. OFDM is used to achieve the speech real-time communication. The system consists of four parts: the voice signal processing module, communication signal processing module, logic control module and power module. The overall block diagram of the system is given and the issues on hardware circuit design and logic interface are described completely and specifically. On the software side, the data transformed by the AMBE-2000 is extracted in DSP and it is modulated and demodulated by OFDM. The register of TLV320AIC23B is initialized and configured by DSP. The signal is transformed and processed in CPLD and AMBE-2000 is initialized and configured. The Bootloader program and transmitting and receiving program are designed.After the testing, the results which the experiment is given are satisfactory and the feasibility of the underwater acoustic voice communication system is proved. |
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