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An Adaptive Threshold Technique for Fast PN Code Acquisition in DS-SS Systems

机译:DS-SS系统中用于快速PN码获取的自适应阈值技术

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摘要

This paper presents an efficient technique to considerably reduce pseudonoise (PN) code acquisition time by adjusting threshold values, depending on the pre-estimated correlation energy in direct-sequence spread spectrum (DS-SS) systems. The proposed technique utilizing a threshold generation mode (TM) prior to a search mode is employed to a conventional double-dwell serial-search algorithm, and the TM determines the threshold values of both search and verification modes, depending on its correlation energy. We present a mathematical model of the proposed scheme to analyze it with respect to the mean code acquisition time in synchronous code-division multiple-access (CDMA) systems such as Third-Generation Partnership Project 2 (3GPP2) under a Rayleigh-fading channel. Numerical results show that the proposed method can reduce the mean code acquisition time by more than 60% and compensate for the performance degradation in high signal-to-noise ratios (SNRs) with no increase in hardware costs, compared with the conventional algorithm that adopts a soft-decision technique.
机译:本文提出了一种有效技术,可通过调整阈值来大幅减少伪噪声(PN)代码的获取时间,具体取决于直接序列扩频(DS-SS)系统中的预先估计的相关能量。所提出的在搜索模式之前利用阈值生成模式(TM)的技术被用于常规双居串行搜索算法,并且TM根据其相关能量确定搜索模式和验证模式的阈值。我们提出了一种拟议方案的数学模型,以在诸如瑞利衰落信道下的第三代合作伙伴计划2(3GPP2)等同步码分多址(CDMA)系统中针对平均码获取时间进行分析。数值结果表明,与采用传统算法的算法相比,该方法在不增加硬件成本的情况下,可以将平均码获取时间减少60%以上,并能补偿高信噪比(SNR)下的性能下降。一种软决策技术。

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