Underwater acoustic communication link adaptive configuration method based on orthogonal signal division multiplexing modulation

Abstract

The invention relates to an underwater acoustic communication link adaptive configuration method based on orthogonal signal division multiplexing modulation, which comprises the following steps of: setting sets of OSDM modulation schemes under different coding lengths of Hadamard, and calculating a signal-to-noise ratio interval under a given error rate; adding a signal segment for environment cognition by a sending end while sending an RTS request channel; and after receiving the RTS, by a receiving end, completing cognition on the environment and calculating and receiving channel related parameters such as a signal-to-noise ratio; by the receiving end, sending a CTS response, and feeding back the corresponding OSDM communication system to the sending end; and after the sending end receives the CTS, adjusting the OSDM communication system of the sending end according to the communication system information in the CTS, so that the corresponding DATA data is sent after the communication systems of the sending end and the receiving end are kept synchronous. Compared with link configuration directly using a single communication mode, the environment cognition link self-adaptive configuration method based on OSDM modulation is more suitable for a real underwater acoustic time-varying channel.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to an adaptive configuration method for underwater acoustic communication links based on orthogonal signal division multiplexing modulation, in particular to an automatic environment awareness link based on OSDM modulation in a time-varying fading channel. Adapt to the configuration method. Background technique [0002] In the underwater acoustic communication network, considering the characteristics of channel time-varying fading in the transmission process, any single modulation and coding method will not be able to meet the diverse requirements for the data rate and reliability of the communication link. The modulation method with strong anti-interference ability tends to have low data transmission rate; while the modulation method with high data transmission rate usually has poor anti-interference ability, resulting in a large bit error rate. [0003] At present, ...

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Problems solved by technology

[0006] The traditional underwater acoustic communication system uses a single modulation and demodulation configuration, which cannot adapt to the time-varying channel environment, resulting in problems such as low channel utilization, low transmission data rate, low throughput, and poor reliability.

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