Title :
Performance of turbo codes on frequency-selective Rayleigh fading channels with joint data and channel estimation
Author :
Hguyen Hoang ; Shwedyk, Ed
Author_Institution :
Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada
Abstract :
Various turbo codes together with π/4 DQPSK modulation are investigated for frequency-selective Rayleigh fading channels. The soft output Viterbi algorithm (SOVA) is selected for equalising multipath fading channels so that both reliability information can be available for turbo decoding and the channel impulse response can be effectively estimated. To keep the receiver´s complexity low, turbo codes are, built from a simple recursive systematic convolutional code with constraint length K=3. The number of channel estimators in the SOVA and the number of iterations to be performed in turbo decoders are also kept small. Simulation results for different mobile speeds and different frame lengths are obtained and it is shown that when the frame size is long enough, turbo codes can significantly outperform a convolutional code of constraint length K=6
Keywords :
Rayleigh channels; Viterbi decoding; differential phase shift keying; interleaved codes; iterative decoding; multipath channels; quadrature phase shift keying; turbo codes; π/4 DQPSK modulation; Rayleigh fading channels; SOVA algorithm; channel equalisation; channel impulse response; frequency-selective fading channels; iterations; joint data/channel estimation; multipath fading channels; recursive systematic convolutional code; reliability information; simulation results; soft output Viterbi algorithm; turbo codes; turbo decoding; AWGN; Binary phase shift keying; Bit error rate; Channel estimation; Convolutional codes; Fading; Frequency; Iterative decoding; State estimation; Turbo codes;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.767897
