Joint Blind Estimation of Channel Length and Noise Variance in OFDM Systems

Bin SHENG  Pengcheng ZHU  Xiaohu YOU  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.12   pp.3614-3617
Publication Date: 2011/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.3614
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
channel impulse response,  ICI,  ISI,  OFDM,  

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Summary: 
The information of channel impulse response (CIR) length and noise variance play an important role in blind identification and equalization of wireless multipath channels. In orthogonal frequency division multiplexing (OFDM) systems, multipath fading channels introduce interference between adjacent symbols which can be prevented by inserting a cyclic prefix (CP) before each symbol. In this letter, we find that the interference power in the cyclic prefix (CP) interval and its variation can be used to estimate the CIR length and noise variance jointly and blindly.