Title :
Turbo decoding for wireless systems with imperfect channel estimates
Author_Institution :
Ericsson Radio Syst. AB, Stockholm, Sweden
fDate :
9/1/2000 12:00:00 AM
Abstract :
A new metric for turbo decoding on Rayleigh fading channels with noisy channel estimates is derived. By including the error variance of the channel estimate in the decoder metric derivation, we calculate the correct channel reliability factor for this case. Simulations show that the signal-to-noise ratio gain of using this new metric, compared to ignoring the uncertainty of the channel estimate, may be as large as 1 dB at a bit error probability of 10-3. This gain is obtained without any complexity increase
Keywords :
Rayleigh channels; channel coding; decoding; error statistics; estimation theory; modulation coding; phase shift keying; telecommunication network reliability; Rayleigh fading channels; bit error probability; channel reliability factor; complexity; decoder metric derivation; error variance; imperfect channel estimate; noisy channel estimates; signal-to-noise ratio gain; turbo decoding; wireless systems; AWGN channels; Additive white noise; Decoding; Error correction; Fading; Gaussian noise; Rayleigh channels; Signal to noise ratio; Turbo codes; Uncertainty;
Journal_Title :
Communications, IEEE Transactions on
