CDMA信號碼片內(nèi)多徑時延估計算法
Time Delay Estimation of Multipath in CDMA Chip
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摘要: 針對CDMA信號的特點，提出了低信噪比條件下估計延遲差小于一個碼片周期的多徑信號時延的有效算法，該文首先建立了一個能夠有效抑制噪聲影響的多徑功率延遲函數(shù)，然后推導(dǎo)了建立在此函數(shù)基礎(chǔ)上的高分辨率時延估計算法，給出了算法的具體步驟，分析了算法的性能，最后通過對比仿真和性能仿真證明了該方法具有低信噪比條件下高頻譜分辨率的特點。
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關(guān)鍵詞:
- CDMA; 多徑; 時延估計; MUSIC; SNR
Abstract: An effective algorithm is proposed to estimate multipath time delays in a CDMA chip under low SNR environment. Firstly, a power delay profile of multipath is constructed which can restrain effect of noise. Then the estimation algorithm that has super resolution is deduced based on the function. A detailed estimation process and analysis of the performance of this approach are given. Finally, comparsion and performance simulation demonstrate that the method can effectively estimate the delay of multipath in a CDMA chip under low SNR environment. -
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