New Code Acquisition Techniques in Spread-Spectrum Communication
New Code Acquisition Techniques in Spread-Spectrum Communication
复制标题
扩频通信中的新代码获取技术
DOI：
10.1109/tcom.1980.1094652
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
Sushila Gupta
中科院分区：
文献类型：
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作者：
A. Elhakeem;G. Takhar;Sushila Gupta
提出了用于获取跳频（FH）、混合跳频/跳时（FH/TH）和跳频/直接序列（FH/DS）扩频系统中的代码的新技术。采用自回归频谱估计来恢复FH码，正交处理用于DS码，而TH门控码则通过与用于频谱估计的自适应滤波器结合使用的简单阈值测试来恢复。由于使用采集逻辑来估计 FH 码相位，因此可以容忍较大的频谱估计误差。所提出的技术仅需要移位寄存器生成器长度量级的采集时间，而串行和并行搜索的其他方案需要代码长度量级的采集时间。详细的仿真结果将确定所提出的不同技术的工作载噪比 (CNR) 范围以及所涉及的各种阈值。
New techniques for acquiring the codes used in frequency hopping (FH), hybrid frequency hopping/time hopping (FH/TH), and frequency hopping/direct sequence (FH/DS) spread-spectrum systems are presented. Autoregressive spectral estimation is employed to recover the FH code, quadrature processing is used for the DS code, while the TH gating code is recovered by a simple threshold test used in conjunction with the adaptive filter used for the spectral estimation. A wide margin of spectral estimation errors can be tolerated since an acquisition logic is used to estimate the FH code phase. The proposed techniques require acquisition times only of the order of the shift-register generator lengths, whereas other schemes of serial and parallel search require acquisition times of the order of the code lengths. Detailed simulation results will identify the working carrier-to-noise ratio (CNR) range for the different techniques presented as well as the various thresholds involved.