通信学报
通信學報
통신학보
JOURNAL OF CHINA INSTITUTE OF COMMUNICATIONS
2013年
9期
12-17,25
,共7页
方勇%赵维杰%汪敏
方勇%趙維傑%汪敏
방용%조유걸%왕민
稀疏表示%压缩感知%快衰落%正交频分复用%信道估计
稀疏錶示%壓縮感知%快衰落%正交頻分複用%信道估計
희소표시%압축감지%쾌쇠락%정교빈분복용%신도고계
sparse expression%compressed sensing%fast fading%OFDM%channel estimation
针对稀疏导频 OFDM 系统,提出非理想载波同步 OFDM 快衰落信道稀疏表示与感知方法。首先提出了一种稀疏化信道核向量的广义信道冲激响应矩阵稀疏化表示方法;推导了稀疏导频快衰落信道估计压缩感知模型;利用OMP算法重构稀疏化信道核向量与广义信道冲激响应矩阵,从而完成非理想载波同步下的 OFDM 快衰落信道估计。仿真结果表明,该算法能有效降低非理想载波同步的稀疏导频 OFDM 系统的误码率。
針對稀疏導頻 OFDM 繫統,提齣非理想載波同步 OFDM 快衰落信道稀疏錶示與感知方法。首先提齣瞭一種稀疏化信道覈嚮量的廣義信道遲激響應矩陣稀疏化錶示方法;推導瞭稀疏導頻快衰落信道估計壓縮感知模型;利用OMP算法重構稀疏化信道覈嚮量與廣義信道遲激響應矩陣,從而完成非理想載波同步下的 OFDM 快衰落信道估計。倣真結果錶明,該算法能有效降低非理想載波同步的稀疏導頻 OFDM 繫統的誤碼率。
침대희소도빈 OFDM 계통,제출비이상재파동보 OFDM 쾌쇠락신도희소표시여감지방법。수선제출료일충희소화신도핵향량적엄의신도충격향응구진희소화표시방법;추도료희소도빈쾌쇠락신도고계압축감지모형;이용OMP산법중구희소화신도핵향량여엄의신도충격향응구진,종이완성비이상재파동보하적 OFDM 쾌쇠락신도고계。방진결과표명,해산법능유효강저비이상재파동보적희소도빈 OFDM 계통적오마솔。
A sparse expression of fast fading channel and its sensing method were proposed for orthogonal fre-quency-division multiplexing (OFDM) system of sparse pilot under the condition of imperfect carrier synchroni-zation. First, a sparsified core vector based sparse expression of the generalized channel impulse response (G-CIR) was proposed by deriving compressed sensing model of the sparse pilot system. Then, both the sparsified core vector and G-CIR were reconstructed by orthogonal matching pursuit (OMP). Simulation results demonstrate that the proposed algorithm can effectively reduce the bit error rate (BER) of the OFDM system with imperfect carrier synchronization.