CAJ | 학술논문

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，对信号做复增广表征，打破一般补相关为零的隐含假定，作复域DSLA主动时反通信。仿真结果验证了复域DSLA主动时反通信性能优于常规主动时反通信，尤其在小信噪比下能有效减小通信误码率，提高水声通信质量。
통신계통건립재향농원-신도모형기출상，신도본신면림착량개필수해결적문제：신도다경전파인기적부호간간우；조성/간우。인이접수단적신호시발사적신호실진화염오적복본。위차，종진궤하설계화신호처리각도량개방면고필，채용공간관대진——쌍라선선진（DSLA）발사/접수수거，병이용파전파시반불변성저일관용적공-시결구특성작DSLA주동시반통신。동시재통신계통중조제신호、수궤해양조성구유비심성。인차，대신호주복증엄표정，타파일반보상관위령적은함가정，작복역DSLA주동시반통신。방진결과험증료복역DSLA주동시반통신성능우우상규주동시반통신，우기재소신조비하능유효감소통신오마솔，제고수성통신질량。
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.