Title :
Maximum-likelihood sequence estimation for coded modulation in the presence of co-channel interference and intersymbol interference
Author :
Murata, Hidekazu ; Yoshida, Susumu
Author_Institution :
Dept. of Electron. & Commun., Kyoto Univ., Japan
Abstract :
Co-channel interference is a major impairment in cellular radio systems. The article evaluates the performance of maximum-likelihood sequence estimation for coded modulation in the presence of co-channel interference and intersymbol interference. In this scheme, a maximum-likelihood sequence estimation implemented with the Viterbi algorithm is extended to estimate both the desired signal and co-channel interference, and combined with trellis-coded modulation to enhance the co-channel interference cancelling capability. The complexity of this scheme grows exponentially with the channel memory and the constraint length of the trellis encoder. Two reduced-state sequence estimation algorithms, namely, the T-algorithm and the M-algorithm, are compared through simulations and the former is found to yield better performance, especially over quasi-static channels
Keywords :
cellular radio; cochannel interference; encoding; estimation theory; interference suppression; intersymbol interference; land mobile radio; maximum likelihood estimation; radiofrequency interference; telecommunication channels; trellis coded modulation; M-algorithm; T-algorithm; Viterbi algorithm; cellular radio systems; channel estimation; channel memory; cochannel interference; coded modulation; constraint length; desired signal estimation; fading channel; interference cancellation; intersymbol interference; maximum-likelihood sequence estimation; performance evaluation; quasistatic channels; reduced state sequence estimation algorithms; simulations; trellis encoder; trellis-coded modulation; Interchannel interference; Interference cancellation; Interference constraints; Intersymbol interference; Land mobile radio cellular systems; Maximum likelihood estimation; Memory management; Modulation coding; Viterbi algorithm; Yield estimation;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501402
