Title :
1 and 2 stage decision feedback coherent detectors for DQPSK in fading channels
Author_Institution :
Dept. of Inf. Theor., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
Novel coherent detectors for DQPSK and π/4-DQPSK on fading channels are presented. The phase reference for the decision device is derived by mean square error estimation of the fading process. A finite impulse response filter is used for this purpose. The decision device is a traditional coherent detector. Both 1 and 2 stage detectors are considered. The proposed detectors show significantly better performance in fast fading compared to a differential detector. The detector may be used with FDMA, TDMA, CDMA and OFDM systems
Keywords :
FIR filters; cellular radio; decision theory; differential phase shift keying; fading; feedback; multi-access systems; quadrature phase shift keying; signal detection; time-varying channels; π/4-DQPSK; 1 stage decision feedback coherent detectors; 2 stage decision feedback coherent detectors; CDMA; DQPSK; FDMA; OFDM; TDMA; fading channels; finite impulse response filter; mean square error estimation; performance; Detectors; Estimation error; Fading; Feedback; Finite impulse response filter; Frequency division multiaccess; Mean square error methods; Multiaccess communication; Phase estimation; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-2742-X
DOI :
10.1109/VETEC.1995.504947
