寬帶CDMA系統(tǒng)中的一種新的自適應(yīng)信道估計方法
A novel adaptive channel estimation scheme for wideband cdma systems
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摘要: 該文提出了采用實測的信道自相關(guān)系數(shù)作為權(quán)重的信道估計處理方法，并給出其誤差性能的數(shù)學(xué)表達(dá)式，同時給出了經(jīng)典的滑動平均信道估計方法的誤差性能的數(shù)學(xué)表達(dá)式。理論分析及仿真結(jié)果表明所提的方法能自動適應(yīng)移動信道的時變模型及衰落速率，具有有效地抑制噪聲的優(yōu)點；同時克服了滑動平均估計方法的估計長度對估計準(zhǔn)確性影響較大的缺點，在移動速度固定及移動速度變化很大的環(huán)境下都具有穩(wěn)定的誤差性能；尤其在移動速度變化很大的環(huán)境下具有比滑動平均估計方法更低的估計方差，大大提高了RAKE接收機的性能。
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關(guān)鍵詞:
- RAKE接收機; 信道估計; 相干檢測; CDMA
Abstract: A channel estimation scheme, using measured autocorrelation coefficients as weighting coefficients of the channel processor, and its error performance in equation are presented in this paper. Error performance of moving averaging channel estimation in equation is provided as well. Numerical and simulation results show that the proposed scheme can trace channel accurately and adaptively and outperforms moving averaging methods under not only fixed but also variant vehicle speeds. -
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