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针对WCDMA反向随机接入信道前导的多码快速捕获特点,提出了一种低复杂度的2级相关捕获算法和电路结构。该方法通过第一级部分码片相干累加后,第二级采用FHT变换求取前导特征码相关性,能够快速实现前导信号检测、特征码确认。通过电路结构和性能仿真分析,在载噪比为-6 d B,最大频偏2 k Hz时,1 024个码片积累可以保证随机接入前导以99%以上概率实时捕获。
Aiming at the multi-code fast acquisition of WCDMA reverse random access channel preamble, a low-complexity 2-level correlation acquisition algorithm and circuit structure are proposed. After coherently accumulating some chips of the first stage, the second stage adopts the FHT transform to get the correlation of the preamble, which can quickly detect the preamble and confirm the signature. Through circuit structure and performance simulation analysis, when the carrier-to-noise ratio is -6 d B and the maximum frequency offset is 2 k Hz, the accumulation of 1 024 chips can ensure that the random access preamble can capture in real time with the probability of over 99%.