现代计算机：下半月版
現代計算機：下半月版
현대계산궤：하반월판
Modem Computer
2012年
13期
3-6
,共4页
UUV%正交频分复用%信道估计%最小%二乘%离散余弦变换
UUV%正交頻分複用%信道估計%最小%二乘%離散餘絃變換
UUV%정교빈분복용%신도고계%최소%이승%리산여현변환
UUV%OFDM%Channel Estimation%Least Square%Discrete Cosine Transform
对最小二乘算法和离散余弦变换算法这两种算法的原理进行详细的分析，并通过仿真对二者性能进行比较。结果表明：后者算法能较好地降低高斯白噪声的影响，相对于前者获得较大的性能增益。同时比较在不同导频数下离散余弦变换算法的性能，结果显示该算法的信道估计性能随导频数的增加得到改善．但增加运算复杂度。
對最小二乘算法和離散餘絃變換算法這兩種算法的原理進行詳細的分析，併通過倣真對二者性能進行比較。結果錶明：後者算法能較好地降低高斯白譟聲的影響，相對于前者穫得較大的性能增益。同時比較在不同導頻數下離散餘絃變換算法的性能，結果顯示該算法的信道估計性能隨導頻數的增加得到改善．但增加運算複雜度。
대최소이승산법화리산여현변환산법저량충산법적원리진행상세적분석，병통과방진대이자성능진행비교。결과표명：후자산법능교호지강저고사백조성적영향，상대우전자획득교대적성능증익。동시비교재불동도빈수하리산여현변환산법적성능，결과현시해산법적신도고계성능수도빈수적증가득도개선．단증가운산복잡도。
Analyses the least square algorithm and Discrete Cosine Transform algorithm in details and compares their performance through the simulation. The results verify that the DCT-based LS estimator has a better performance for OFDM systems. Moreover, the effect of power limitation in terms of SNR and the number of pilots for a wireless channel is determined to compare the DCT-based LS estimator. The result indicates that the estimator with large number of pilots has better performance, but increases the computational complexity.
