Title :
Decision-directed fine synchronization for coded OFDM systems
Author :
Shi, K. ; Serpedin, E. ; Ciblat, P.
Author_Institution :
Texas A&M Univ., College Station, TX, USA
Abstract :
A new decision-directed (DD) synchronization scheme is proposed for joint estimation of carrier frequency offset (CFO) and sampling clock frequency offset (SFO) in coded orthogonal frequency division multiplexing (OFDM) systems. By exploiting the decisions provided by a Viterbi decoder and the information available on all the modulated subcarriers, we report accurate estimators of residual CFO and small SFO without relying on pilots. The performance analysis and simulation results indicate that the proposed novel DD scheme achieves much better performance than the conventional pilot-based schemes in both AWGN and frequency-selective channels.
Keywords :
AWGN channels; OFDM modulation; Viterbi decoding; decision theory; frequency estimation; signal sampling; synchronisation; AWGN channels; Viterbi decoder; carrier frequency offset; coded OFDM systems; decision-directed fine synchronization; frequency-selective channels; joint estimation; modulated subcarriers; performance analysis; residual CFO; sampling clock frequency offset; simulation; small SFO; AWGN; Analytical models; Clocks; Decoding; Frequency estimation; Frequency synchronization; OFDM modulation; Performance analysis; Sampling methods; Viterbi algorithm;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
Print_ISBN :
0-7803-8484-9
DOI :
10.1109/ICASSP.2004.1326839
