Title :
Reduced-state soft-output trellis-equalization incorporating soft feedback
Author :
Muller, Stefan H. ; Gerstacker, Wolfgang H. ; Huber, Johannes B.
Author_Institution :
Lehrstuhl fur Nachrichtentech., Erlangen-Nurnberg Univ., Germany
Abstract :
A novel reduced-state soft-output trellis-equalization algorithm is presented, which essentially is a combined application of the algorithms of Bahl et al. (1974) and that of Lee (1974) to a reduced-state trellis. State reduction is accomplished by a feedback of soft decisions. For this, soft decisions are calculated using a reduced-state Lee algorithm. The proposed feedback is optimum in terms of the mean-squared error. We show that Lee and Bahl algorithms share a common core and can easily be combined. Simulation results for an application in the GSM system demonstrate the improved performance of the proposed algorithm, compared to a conventional reduced-state Bahl algorithm using feedback of hard decisions
Keywords :
cellular radio; decision feedback equalisers; quantisation (signal); Bahl algorithm; GSM system; algorithms; mean squared error; performance; reduced state Lee algorithm; reduced state soft output trellis equalization; simulation results; soft decision feedback; state reduction; Decision feedback equalizers; Delay estimation; Digital communication; Dispersion; GSM; Intersymbol interference; Maximum likelihood decoding; Maximum likelihood estimation; Probability; State feedback;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.594340
