Title :
Blind maximum likelihood sequence detection
Author :
Reader, David J. ; Cowley, William G.
Author_Institution :
Commun. Div., Defence Sci. & Technol. Organ., Salisbury, SA, Australia
Abstract :
Maximum a posteriori (MAP) sequence detection for channels with intersymbol interference (ISI) has previously required knowledge of the channel sampled impulse response (SIR). Generally the SIR coefficients are determined via least mean square (LMS) or recursive least squares (RLS) estimation algorithms. For many unguided media channels such as mobile radio and high frequency (HF) radio which exhibit a time-varying SIR, these estimators must be adaptive. Adaptive estimators often fail to track adequately and are a major source of detector deterioration. A novel, blind maximum likelihood sequence detection (BMLSD) formulation without the need for external channel SIR estimation is proposed. A new method for resolving ambiguity in the channel delay is also included. The BMLSD performance is evaluated via simulation
Keywords :
intersymbol interference; land mobile radio; maximum likelihood detection; maximum likelihood estimation; telecommunication channels; HF radio; ISI channels; MAP sequence detection; blind maximum likelihood sequence detection; channel delay; intersymbol interference; maximum a posteriori sequence detection; mobile radio; Detectors; Frequency estimation; Hafnium; Intersymbol interference; Land mobile radio; Least squares approximation; Maximum likelihood detection; Maximum likelihood estimation; Recursive estimation; Resonance light scattering;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3192-3
DOI :
10.1109/ICASSP.1996.548020