Multiuser channel estimation for detection of cochannel signals

• Published in: IEEE International Conference on Communications, 1999 Vol. 1; pp. 63 - 67 vol.1.
• Main Authors: Grant, S.J., Cavers, J.K.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1999
• Subjects: Autocorrelation; Channel estimation; Colored noise; Fading; Interference cancellation; Multiaccess communication; Multiuser detection; Propagation delay; Signal detection; Time division multiple access
• ISBN: 9780780352841; 078035284X
• DOI: 10.1109/ICC.1999.767885

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 subject in the context of TDMA systems. This paper addresses a pilot-based technique for multiuser channel estimation in a TDMA system, and makes several new contributions: it allows for time variation of the channels within and between training sequences, it accounts for colouration of the sampled noise sequence as well as correlation between the channel taps, and it considers users to be asynchronous resulting in a technique whereby explicit timing recovery is unnecessary. In addition, it addresses selection of appropriate training sequences.