Title :
On the capacity loss due to separation of detection and decoding
Author :
Müller, Ralf R. ; Gerstacker, Wolfgang H.
Author_Institution :
Forschungszentrurn Telckommunikation Wien, Vienna, Austria
Abstract :
The performance loss due to separation of detection and decoding on the binary-input additive white Gaussian noise (AWGN) channel is quantified in terms of mutual information. Results are reported for both the code-division multiple-access (CDMA) channel in the large system limit and the intersymbol interference (ISI) channel. The results for CDMA rely on the replica method developed in statistical mechanics. It is shown that a previous result of Shamai and Verdu found for Gaussian input alphabet holds also for binary input alphabets. For the ISI channel, the performance loss is calculated via the Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm. Comparisons are made to the capacity of separate detection and decoding using suboptimum detectors such as a decision-feedback equalizer.
Keywords :
AWGN channels; channel capacity; code division multiple access; decision feedback equalisers; decoding; intersymbol interference; maximum likelihood estimation; AWGN channel; Bahl-Cocke-Jelinek-Raviv algorithm; CDMA; ISI; binary-input additive white Gaussian noise; channel capacity; code-division multiple-access channel; decision-feedback equalizer; detection-decoding separation; intersymbol interference channel; maximum a posteriori detection; mutual information; replica method; statistical mechanics; suboptimum detectors; AWGN; Decision feedback equalizers; Decoding; Detectors; Fading; Intersymbol interference; Mobile communication; Multiaccess communication; Performance loss; Viterbi algorithm; CDMA; Channel capacity; ISI; MAP; code-division multiple access; detection; fading channels; intersymbol interference; maximum a posteriori; replica method; statistical mechanics;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2004.831854
