Title :
A predictor-based decision feedback channel estimation method for COFDM with high resilience to rapid time-variations
Author :
Al-susa, E. ; Ormondroyd, R.F.
Author_Institution :
Sch. of Electron. & Electr. Eng., Bath Univ., UK
Abstract :
This paper investigates the performance of a coherent COFDM system in the presence of a time-varying frequency-selective fading channel using a predictor-based channel estimator. The channel estimation method is based on a decision-directed adaptive technique that uses decisions at the output of either the detector (uncoded mode) or the decoder (coded mode). The main aim is to investigate the effect of using a time-domain predictor on the performance of the channel estimator and to compare its impact on both the coded and uncoded estimator modes. It is found that the predictor significantly improves the estimator´s performance, especially when the channel changes rapidly between consecutive OFDM symbols. It is also found that the performance of both the coded and uncoded estimator modes converge for SNR>15 dB
Keywords :
OFDM modulation; adaptive estimation; decision feedback equalisers; fading channels; prediction theory; time-varying channels; COFDM; coded mode; decision-directed adaptive technique; performance; predictor-based decision feedback channel estimation method; rapid time-variations; time-domain predictor; time-varying frequency-selective fading channel; uncoded mode; Channel estimation; Decoding; Delay estimation; Detectors; Feedback; Forward error correction; OFDM; Resilience; Time domain analysis; Time varying systems;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.797138