关键词: 主动时反, 宽线性估计, 双螺旋线阵, 非寻性

Abstract: The communication system is based on the Shannon source-channel model. The channel suffers from two major kinds of impairments：one is inter-symbol interference, which is due to the multipath propagation; another one is noise/interference. The net result of the two impairments is that the signal received at the channel output is a noisy and distorted version of the signal that is transmitted. The paper considers it from two aspects, which are array geometric design and signal processing. It uses a spatial broadband array—double spiral line array transmitting/receiving data, and exploits the robust spatial-temporal property that wave propagation is time invariant. At the same time, the modulated signal in communication system and the random ocean noise is improper. So it is reasonable that do complex domain DSLA active time reversal communication, which makes a complex augmented characterization of signal and breaks the implicit assumption. The simulated result proves that complex domain DSLA active time reversal communication is better than traditional active time reversal communication, especially when the signal pulse noise is small it effectively reduces the error rate and improves the quality of underwater acoustic communication.

Key words: active time reversal, widely linear estimation, double spiral line array, impropriety