A differentially coherent PN code acquisition receiver for CDMA systems
A differentially coherent PN code acquisition receiver for CDMA systems
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DOI：
10.1109/26.649772
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发表时间：
1997-11
期刊：
影响因子：
--
通讯作者：
M. Zarrabizadeh;E. Sousa
中科院分区：
文献类型：
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作者：
M. Zarrabizadeh;E. Sousa
介绍了一种用于直接序列扩频信号捕获的新型差分相干检测器。这些探测器是过去几乎完全考虑的非相干探测器的替代方案。所提出的检测器适用于商用码分多址(CDMA)系统，这些系统在相对较大的噪声下限下工作，并且提供了比非相干检测器高得惊人的信噪比(SNR)，大约为5分贝。在随机码序列假设下，对全周期相关(FPC)和部分周期相关(PPC)差分相干检测性能进行了精确分析。研究了部分周期相关和全周期相关下检测器的检测性能和虚警概率，并与经典的非相干检测结果进行了比较。比较了单驻留捕获方案和多驻留捕获方案与非相干捕获方案的平均捕获时间。
New differentially coherent detectors for acquisition of direct sequence spread-spectrum signals are introduced. These detectors are alternatives to the noncoherent detectors that have been considered almost exclusively in the past. The proposed detectors are suitable for commercial code-division multiple-access (CDMA) systems which operate with a relatively large noise floor and provide a surprisingly large signal-to-noise ratio (SNR) improvement over the noncoherent detectors of approximately 5 dB. Under the random code sequence assumption, an exact analysis of the differentially coherent detection performance for both full period correlation (FPC) and partial period correlation (PPC) is carried out. The detector performance in terms of detection and false alarm probabilities for both partial and full period correlations is investigated, and the results are compared with those of classical noncoherent detection. The mean acquisition time for both single-dwell and multiple-dwell acquisition schemes are compared with their noncoherent counterparts.