CAJ | 학술논문

针对直扩通信多音干扰抑制算法应用受限于采样率较高的问题，在分别构建信号和干扰稀疏字典的基础上，利用正交匹配追踪算法，设计了一种压缩域直扩通信多音干扰抑制算法，并通过理论分析和计算机仿真验证了算法的有效性。仿真结果表明，在已知干扰稀疏度的条件下，该方法能够有效抑制多音干扰，干扰抑制效果不随干扰数量、干扰强度变化而变化，在压缩率为1/2、干信比为20 dB的条件下重构信号与加性高斯白噪声信道中传输信号解调性能相比只有约5 dB的信噪比损失。这将为在多音干扰条件下压缩采样后直扩信号的重构提供一种有效方法。
침대직확통신다음간우억제산법응용수한우채양솔교고적문제，재분별구건신호화간우희소자전적기출상，이용정교필배추종산법，설계료일충압축역직확통신다음간우억제산법，병통과이론분석화계산궤방진험증료산법적유효성。방진결과표명，재이지간우희소도적조건하，해방법능구유효억제다음간우，간우억제효과불수간우수량、간우강도변화이변화，재압축솔위1/2、간신비위20 dB적조건하중구신호여가성고사백조성신도중전수신호해조성능상비지유약5 dB적신조비손실。저장위재다음간우조건하압축채양후직확신호적중구제공일충유효방법。
The existing direct sequence spread spectrum ( DSSS ) communications multi-tone suppression algorithms are confined to the high sampling rate. To overcome this problem,the sparse dictionary of the DSSS signal and multi-tone jamming are built and an algorithm is designed to suppress the multi-tone jam-ming for the DSSS communications in compressive domain by using the orthogonal matching pursuit( OMP) algorithm. The effectiveness of the algorithm is verified through the theoretical analysis and computer simu-lation. The results show that the method can suppress the multi-tone jamming effectively with the prior in-formation of the jamming sparse degree,the jamming suppression performance don’ t change over the jam-ming quantity and jamming intensity. The demodulation performance of the reconstructed signal in the con-dition of 1/2 compression rate and 20 dB jammer-to-signal ratio( JSR) only 5 dB signal-to-noise ratio ( SNR) loss compared with that of the signal transmitted in additive white Gaussian noise( AWGN) chan-nel. This will provide an effective method for reconstruction of compressed DSSS signal in the multi-tone jamming condition.