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首页> 外文期刊>IEEE Journal on Selected Areas in Communications >A technique to improve the performance of serial, matched-filter acquisition in direct-sequence spread-spectrum packet radio communications
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A technique to improve the performance of serial, matched-filter acquisition in direct-sequence spread-spectrum packet radio communications

机译：在直接序列扩频分组无线通信中提高串行匹配滤波器采集性能的技术

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摘要

In this paper, we examine a simple method to improve the performance of serial, matched-filter acquisition in direct-sequence spread-spectrum packet radio communications. Each packet transmission includes an acquisition preamble, and the preamble sequence is changed at the boundaries of predefined time epochs based on a pseudorandom sequence generator. It is shown in previous work that the presence of an intermediate-frequency filter and the characteristics of the automatic gain-control subsystem lead to a probability of not acquiring that is a nonmonotonic function of the signal-to-noise ratio if the acquisition algorithm uses a threshold-crossing detector with a fixed threshold. The acquisition algorithm presented in this paper employs an estimator to adaptively select the acquisition threshold for each test statistic. It is shown that this technique reduces the severity of the nonmonotonicity and substantially improves the acquisition performance.
机译：在本文中，我们研究了一种在直接序列扩频分组无线通信中提高串行匹配滤波器采集性能的简单方法。每个分组传输都包括获取前同步码，并且该前同步码序列基于伪随机序列生成器在预定时间周期的边界处改变。在先前的工作中表明，如果采集算法使用中频滤波器和自动增益控制子系统的特性，则会导致无法获得的概率是信噪比的非单调函数。具有固定阈值的阈值交叉检测器。本文提出的采集算法采用估计器为每个测试统计量自适应选择采集阈值。结果表明，该技术降低了非单调性的严重性，并大大提高了采集性能。

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