Title :
The effect of imperfect CSI on QAM bit-interleaved coded modulation with iterative decoding in fading
Author :
Huang, Yuheng ; Ritcey, James A.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Abstract :
We study the impact of imperfect channel state information (CSI) on the bit-error rate (BER) of QAM bit-interleaved coded modulation with iterative decoding (BICM-ID), in flat Rayleigh fading. The key parameter characterizing this effect is the power correlation coefficient /spl rho/ between the fading gain and its estimate. An accurate and efficient bound is developed to predict the asymptotic BER. We also show simulation results for QAM BICM-ID with 8-state and 16-state convolutional codes to provide the performance evaluation. For the 16-state code with modified set partitioning labeling and power correlation /spl rho/=0.95, a BER of 10/sup -6/ can be achieved at E/sub b//N/sub 0/=11 dB, with 4 passes of soft feedback. This corresponds to about 3.5 dB increase in the required E/sub b//N/sub 0/ compared to that of perfect CSI.
Keywords :
Rayleigh channels; convolutional codes; error statistics; iterative decoding; modulation coding; parameter estimation; quadrature amplitude modulation; E/sub b//N/sub 0/; QAM; Rayleigh fading; asymptotic BER; bit-error rate; bit-interleaved coded modulation; channel estimation error; convolutional codes; fading gain; flat fading; imperfect channel state information; iterative decoding; power correlation coefficient; Bit error rate; Channel state information; Convolutional codes; Feedback; Interleaved codes; Iterative decoding; Labeling; Modulation coding; Quadrature amplitude modulation; Rayleigh channels;
Conference_Titel :
Signals, Systems and Computers, 2001. Conference Record of the Thirty-Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7147-X
DOI :
10.1109/ACSSC.2001.987657
