CDMA抗干扰微分相关时延估计算法研究

Study on Anti-Interference Code Timing Estimate Algorithms of CDMA Based on Differential Correlation Technology

  • 摘要: 基于微分相关技术,提出了一种简单有效的DS-CDMA时延估计方法,在获取期望用户导频信道的前提下,通过选取适当的时间间隔,可以消除采样数据相关矩阵中与期望用户不相关的干扰和噪声。仿真结果表明,与常规实验估计算法相比,该方法具有更好的干扰抑制性能和更大的正确捕获概率。

     

    Abstract: In this paper, we propose aimple and efficient algorithm for code timing acquisition in direct-sequence code-division multiple-access communication system. The essential assumption is that an unmodulated pilot channel is available for the desired user. Then the correlation matrix of sampled data, where the suitable time lag is selected, contains the timing information only of desired user, while the contributions of uncorrelated interferences and noise are suppressed out. The experiment results show that more interference suppression and correct synchronization probability are achieved comparing to the conventional approach.

     

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