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Whitepaper: Analysis of Decision-Feedback Based Broadband OFDM Systems

by Rice UniversityJan 01, 2008

In wireless communications, about 25% of the bandwidth is dedicated to training symbols for channel estimation. The principle is as follows: the detected symbols (hard decision) are fed back to the channel estimator in order to re-estimate the channel more accurately. However, semi-blind approach can significantly deteriorate the performance if the bit error rate is high. This paper proposes how to determine analytically the minimum Signal to Noise Ratio (SNR) from which a semi-blind method