一種OFDM系統(tǒng)中的盲信道估計算法
A blind channel estimation algorithm for an OFDM system
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摘要: 該文利用OFDM系統(tǒng)傳輸?shù)男畔⒎枮橛邢拮址透髯虞d波的相互獨立特性，提出了用偽導頻符號(PPS)進行信道的盲估計算法。與用于做信道估計的導頻符號不同，PPS傳輸?shù)氖怯杏玫臄?shù)據(jù)，因此提高了系統(tǒng)的帶寬利用率，PPS的平均功率增加3dB或6dB可有效抑制信道的加性高斯噪聲。對信道盲估計的均方誤差(MSE)和由此算法獲得的信道的狀態(tài)信息對無編碼的OFDM系統(tǒng)進行解調(diào)的誤比特率進行了仿真，結(jié)果表明提出的算法是有效的并具有很好的靈活性。
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關(guān)鍵詞:
- 盲信道估計; OFDM; 偽導頒符號
Abstract: In this paper, a blind channel estimator based on the aid of Pscudo-Pilot-Symbols (PPS) is proposed in terms of the two characters of OFDM system: the finite alphabet property of information symbols and independent property between subchannels. Unlike pilots which are used for estimation of channel and must waste some useful bandwidth, the PPSs, whose power can be boosted 3dB or 6dB to suppress efficiently the additive noise, is useful data transmitted, thus efficiency of the OFDM has been increased. Performance simulation of the proposed estimator including Mean Squares Error (MSE) of channel and uncoded Bit Error Rate(BER) have been taken, and the results show the estimator is efficient and very flexible. -
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