基于相位估計(jì)器的直接序列快捕方法
Rapid Acquisition for DS/SS Systems Using a Phase Estimator
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摘要: 該文提出一種基于直接序列擴(kuò)頻系統(tǒng)(DS/SS)的碼相位估計(jì)器。它能根據(jù)輸入信號(hào)與一個(gè)特殊序列不同相位下的互相關(guān)值，相當(dāng)準(zhǔn)確、有效地估計(jì)出本地偽隨機(jī)序列的改進(jìn)方向和大小，成倍地縮短了捕獲的時(shí)間。理論分析和計(jì)算機(jī)模擬表明，對(duì)于周期511以上的偽隨機(jī)碼而言，該算法在正常工作條件下平均捕獲時(shí)間僅為常規(guī)捕獲方法的一半。
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關(guān)鍵詞:
- 直接序列擴(kuò)頻;捕獲;相位估計(jì)器
Abstract: In this paper, a phase estimator of serial search acquisition is proposed for Direct-Sequences Spread- Spectrum(DS/SS) systems. According to the cross correlation between the PN signal and the auxiliary signals with the different phases, an exact and valid estimation of improving direction and magnitude for the local PN generator is given, by which half the mean acquisition can be reduced. Analysis in theory and numerical results show that the proposed method can achieve acquisition at least two times faster than the conventional serial search method for the PN sequences which periods are more than 511 in normal operating condition. -
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