一种突发直扩信号盲检测算法

针对突发直扩信号的盲检测问题,提出一种基于波动相关和滑动-延迟-相关相结合的盲检测算法.算法重点研究了突发直扩信号的存在性检测和信号起止点的捕获问题.首先利用波动相关法解决了信号的存在性检测问题,并精确估计出直扩信号的扩频周期,然后通过滑动-延迟-相关的方法准确捕获信号的起止点位置,最终实现信号的盲检测.仿真结果表明,该算法判决精度高,且抗频偏,在信噪比为-7dB时其检测概率可达90％以上.

Algorithm for Blind Detection of the Burst DSSS Signal

To detect the burst Direct Sequence Spread Spectrum （DSSS） signal blindly, an algo- rithm for blind detection is proposed by combining the fluctuations of correlation estimators with the method of slippage-delay-correlation. The algorithm mainly studies the presence detection of the burst DSSS signal and the acquisition of the start and end points of the signal. Firstly, the presence detection of the signal is implemented by using the fluctuations of correlation estimators, and the spreading period of DSSS signal is estimated accurately at the same time. Then, the method of slip- page-delay-correlation is used for the acquisition of the start and end points. Ultimately, the correct detection of the signal is achieved. The simulation results demonstrate that the proposed algorithm has higher precision of decision and is robust to the frequency offset, and the probability of detection can reach above 90% when the signal to noise ratio （SNR） is -7dB.