复域DSLA主动时反通信-计算机工程与应用.pdf

230 2015 ，51（2 ） Computer Engineering and Applications 计算机工程与应用 复域DSLA 主动时反通信 王颖恒，赵航芳 WANG Yingheng, ZHAO Hangfang 浙江大学 信息与通信工程研究所，杭州 310027 Institute of Information and Communication Engineering, Zhejiang University, Hangzhou 310027, China WANG Yingheng, ZHAO Hangfang. Complex domain DSLA active time reversal communications. Computer Engi- neering and Applications, 2015, 51 （2 ）：230-235. 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 communica- tion 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 simu- lated result proves that complex domain DSLA active time reversal communication is better than traditional active time rever- sal 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 摘 要：通信系统建立在香农源-信道模型基础上，信道本身面临着两个必须解决的问题：信道多径传播引起的符号 间干扰；噪声/干扰。因而接收端的信号是发射的信号失真和染污的复本。为此，从阵几何设计和信号处理角度两个 方面考虑，采用空间宽带阵——双螺旋线阵（DSLA ）发射/接收数据，并利用波传播时反不变性这一宽容的空-时结构 特性作DSLA 主动时反通信。同时在通信系统中调制信号、随机海洋噪声具有非寻性。因此，对信