阵列天线接收信号状态变化检测的研究

S. Kato, K. Umebayashi, Yasuo Suzuki
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引用次数: 0

摘要

在阵列天线波束形成中,通常需要对初始采集进行预处理,包括参考信号的检测和同步。由于载波频率偏移,匹配滤波器等相关器的初始采集性能会降低。载波频偏的对抗通常需要大量的计算成本,此外还需要逐个符号地执行。实际上,初始采集问题近似等价于检测接收信号的状态变化。状态由接收到的信号功率和到达的方向来表示,状态的改变可能是由于新的信号到达而引起的。在我们的新方法中,只有在检测到状态变化时才使用带有载波频偏对策的匹配滤波器,在本文中,我们只关注状态变化检测器。能量检测器(ED)还具有检测状态变化的能力,且检测性能不受载流子偏移的影响,且复杂度很低。然而,同信道干扰使得ED很难实现。在本文提出的方法中,检验统计量是基于协方差矩阵设计的,该协方差矩阵不仅包含能量信息,还包含方向到达信息,因此比ED具有更好的检测性能。计算机仿真结果表明了该方法的有效性和优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A study on detection of receiving signal status change with array antenna
In beam forming with array antenna so-called adaptive array antenna, typically initial acquisition including reference signal detection and synchronization is required as preprocessing. Performance of the initial acquisition by correlator, such as matched filter, degrade the performance due to carrier frequency offset. A countermeasure for carrier frequency offset usually requires significant computational cost, in addition it requires to be performed symbol-by-symbol. In fact, the initial acquisition problem is approximately equivalent to detecting status change of received signal. The status is indicated by the received signal power and direction of arrivals, the status change may be caused by new signal arrival. In our new approach, the matched filter with countermeasure for carrier frequency offset is used only if the status changed is detected and in this paper, we only focus on the status change detector. Energy detector (ED) also has a capability to detect the status change, in addition the detection performance is not affected by carrier offset and the complexity is very low. However, co-channel interference makes the ED difficult. In our proposed method, the test statistic is designed based on covariance matrix which include not only energy information but also direction arrival information, therefore it can achieve better detection performance than the ED. Computer simulation results will show validities and benefits of the proposed method.
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