ICI Suppression of Underwater Acoustic OFDM Signal Transmission by Differential Multichannel Detection

In this paper, we propose an underwater communication method that can realize real-time communication, which can be used for communication between high-speed UUV and underwater intelligent nodes. This method of Doppler compensation of orthogonal frequency division multiplexed signals for underwater communication does not utilize the conventional channel estimation method, but uses the concept of decomposing channel variations based on a set of known functions. OFDM symbol reconstruction is performed after the T (Taylor)-FFT decomposition channel. A stochastic gradient adaptive algorithm is designed to learn the combination of detection weights. Thus, the two steps of channel matching filtering and channel balancing are implemented by one step. The validity and correctness of this method are verified by the recent experimental data (several kilometers in shallow water, 12-15 kHz band) of mobile underwater acoustic communication provide technical support for high-speed mobile object communication.