순환 주파수 추정을 통한 직접 시퀀스 대역 확산 신호 탐지 알고리즘 복잡도 저감

초록

For a non-cooperative context, it is difficult to detect the direct sequence spread spectrum (DSSS) signal at the receiver when the spreading code is unknown due to its low probability of intercept characteristic. To detect the DSSS signal, the detection algorithm exploiting the cyclostationarity of the DSSS signal was proposed, which shows good detection performance in a channel with low signal-to-noise ratio. However, this algorithm requires a long time to detect signals because of its high computational complexity. In this paper, we propose an improved algorithm that can reduce the complexity by first estimating the cyclic frequencies of the incoming signal. Through computer simulations, we verify that the proposed algorithm can show the same detection performance as in conventional algorithms with lower computational complexity.

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