TD-SCDMA系統(tǒng)中信道估計算法的性能分析及改進
Performance Analysis and Improvement of the Channel Estimation Algorithm in the TD-SCDMA System
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摘要: TD-SCDMA系統(tǒng)中普遍采用Steiner信道估計算法,但是由于信道估計器受背景噪聲的影響,會造成信道沖激響應(yīng)的幅度和時延比真實值大。該文提出了兩種對Steiner信道估計的改進方法,它們分別設(shè)定了一定的門限。仿真結(jié)果表明,通過這種處理,系統(tǒng)的輸出性能得到明顯改進。
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關(guān)鍵詞:
- TD-SCDMA; 信道估計; 門限處理
Abstract: The adoption of B. Steiner channel estimation algorithm is prevalent in TD-SCDMA system. However, the estimated channel impulse responses are affected by the noise in the channel, therefore their amplitudes and delays are larger than the real channel impulse responses. Two improved algorithms are proposed, both of which set gates for the channel impulse responses. The simulation results show that both the outputs of channel estimator and the system performance are improved by adopting the gate method. -
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