摘要
采用功率谱检测法,自相关检测法和高阶累计量检测法对低信噪比下DSSS/QPSK信号进行检测方法。计算机仿真表明,功率谱检测法在信噪比较低时失去了检测能力,而充分利用了伪随机码周期特性的自相关检测法和高阶累计量检测法的检测性能较优,高阶累计量法由于其更好的抑制噪声特性显示出更好的性能。同时,文中比较了DSSS/BPSK信号和DSSS/QPSK信号在相同检测方法下的性能差异。由于调制方式不同,相同的方法对DSSS/QPSK信号的检测性能略低于DSSS/BPSK信号。
In this paper, power spectrum detection method, correlation detection method and high - order statistics detection method are introduced to detect DSSS/QPSK signal at low SNR. Simulation shows that power spectrum detection method cannot detect the signal at low SNR, while the correlation detection method and high - order statistics detection method work well. Especially the high - order statistics detection method achieves better performance. The capability difference between DSSS/BPSK signal and DSSS/QPSK signal are also measured. Due to different modulate modes, the detect capability of DSSS/BPSK signal is better than DSSS/ QPSK signal with the same detection method.
出处
《电子科技》
2007年第9期41-44,共4页
Electronic Science and Technology
