Title :
A decision directed coherent detector for OFDM
Author :
Frenger, Pål ; Svensson, Arne
Author_Institution :
Dept. of Inf. Theory, Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
28 Apr-1 May 1996
Abstract :
A coherent decision directed detector for orthogonal frequency division multiplexing (OFDM) is proposed and analyzed. The modulator uses differential encoded signalling over a multipath frequency selective Rayleigh fading channel. The detector employs a decision directed linear minimum mean square error (LMMSE) estimator of the channel gain on each subchannel. The main idea is to explore the correlation between the subchannels in order to obtain a good channel estimate. The proposed LMMSE based detector is shown to be significantly better than a standard differential channel estimator
Keywords :
Rayleigh channels; approximation theory; correlation methods; demodulation; fading; frequency division multiplexing; multipath channels; signal detection; telecommunication signalling; LMMSE estimator; OFDM; channel estimation; channel gain; correlation; decision directed coherent detector; decision directed linear minimum mean square error; detector performance; differential channel estimator; differential encoded signalling; frequency selective Rayleigh fading channel; multipath channel; orthogonal frequency division multiplexing; subchannel; Data communication; Detectors; Fading; HDTV; Information analysis; Information theory; Mean square error methods; OFDM modulation; Rayleigh channels; System testing;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.504025
