An interference suppression scheme with joint channel-dataestimation
Diggavi, S.N.
Boon Chong Ng
Paulraj, A.
AT&T Shannon Labs., Florham Park, NJ;
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: Nov 1999
Volume: 17,
Issue: 11
On page(s): 1924-1939
ISSN: 0733-8716
References Cited: 39
CODEN: ISACEM
INSPEC Accession Number: 6454902
Digital Object Identifier: 10.1109/49.806822
Current Version Published: 2002-08-06
Abstract
This paper describes an adaptive space-time receiver with joint
channel-data estimation (JCDE) to combat time-varying (TV) multipath
channels in the presence of undesired cochannel interference (CCI). The
receiver uses a colored Gaussian metric for sequence detection in order
to suppress the CCI. The proposed scheme also uses the knowledge of the
transmit filter for improved channel estimation to enhance performance.
The algorithm is derived as a quasi-Newton scheme on a chosen cost
criterion and is also locally convergent. The performance of this class
of interference cancellers is examined through the pairwise error
probability (PEP). Through these expressions we gain insight into the
properties of the canceller. The effect of channel dynamics and
identification mismatch on the PEP is also examined. To reduce
implementational complexity, a hybrid delayed-decision feedback and JCDE
scheme is also proposed. The performance is illustrated using numerical
results in realistic transmission environments
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