计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2015年
7期
1701-1705
,共5页
正交频分复用%信道估计%压缩感知%正交匹配追踪%动态门限
正交頻分複用%信道估計%壓縮感知%正交匹配追蹤%動態門限
정교빈분복용%신도고계%압축감지%정교필배추종%동태문한
OFDM%channel estimation%compressive sensing%OM P%dynamic threshold
针对传统的最小二乘（LS）算法需要导频数多而估计精度不高、正交匹配追踪（OMP）算法估计效果好但计算复杂度高的缺点，从硬件实现的角度出发，提出一种基于动态门限的OM P信道估计算法，对OFDM 的信道响应进行估计。该算法可减少OM P算法寻找匹配向量时向量运算的次数。仿真结果表明，与LS算法相比，该算法使用较少的导频，获得了很好的信道估计性能；与OM P算法相比，该算法显著减少了计算复杂度和运算时间。
針對傳統的最小二乘（LS）算法需要導頻數多而估計精度不高、正交匹配追蹤（OMP）算法估計效果好但計算複雜度高的缺點，從硬件實現的角度齣髮，提齣一種基于動態門限的OM P信道估計算法，對OFDM 的信道響應進行估計。該算法可減少OM P算法尋找匹配嚮量時嚮量運算的次數。倣真結果錶明，與LS算法相比，該算法使用較少的導頻，穫得瞭很好的信道估計性能；與OM P算法相比，該算法顯著減少瞭計算複雜度和運算時間。
침대전통적최소이승（LS）산법수요도빈수다이고계정도불고、정교필배추종（OMP）산법고계효과호단계산복잡도고적결점，종경건실현적각도출발，제출일충기우동태문한적OM P신도고계산법，대OFDM 적신도향응진행고계。해산법가감소OM P산법심조필배향량시향량운산적차수。방진결과표명，여LS산법상비，해산법사용교소적도빈，획득료흔호적신도고계성능；여OM P산법상비，해산법현저감소료계산복잡도화운산시간。
Based on the fact that the conventional least squares (LS) algorithm needs many pilots but the accuracy is not high and the orthogonal matching pursuit (OMP) algorithm has high precision as well as high computational complexity ,from the per‐spective of hardware implementation ,an improved OMP algorithm was applied to the OFDM system channel estimation .This al‐gorithm reduced the number of vector operations in OMP algorithm when finding the match vector .Results of simulations show that the improved algorithm has better performance with fewer pilots compared to least square estimation .Compared with the OMP algorithm ,the improved algrithm can acquire almost the same performance with lower complexity and less computation time .
