Multiuser channel estimation for detection of cochannel signals

• Published in: IEEE transactions on communications Vol. 49; no. 10; pp. 1845 - 1855
• Main Authors: Grant, S.J., Cavers, J.K.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2001; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Associate members; Cancellation; Channels; Design engineering; Fading; Impulses; Interference; Interference cancellation; Interference suppression; Multiaccess communication; Multidimensional systems; Multiuser channels; Multiuser detection; Signal detection; Time division multiple access; Training
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/26.957406

Estimation of the channel impulse responses of multiple cochannel users is a key requirement of all multiuser detection and interference cancellation techniques, though little attention has been paid to the subject in the context of time-division multiple-access (TDMA) systems. This paper addresses a pilot-based MMSE technique for multiuser channel estimation in a TDMA system, and makes two key contributions. Firstly, it allows for time variation of the channels within and between training sequences, an essential feature in a multiuser environment even at moderate fading rates. Secondly, it addresses the design of training sequences for the multiple cochannel users.