Blind on-line detection of equalisation errors in digital communications

TitleBlind on-line detection of equalisation errors in digital communications
Publication TypeConference Paper
Year of Publication1997
AuthorsDogancay, K., and V. Krishnamurthy
Conference NameAcoustics, Speech, and Signal Processing, 1997. ICASSP-97., 1997 IEEE International Conference on
Pagination3873 -3876 vol.5
Date Publishedapr.
Keywordsblind online detection, channel equaliser output, data communication, detection performance, digital communication, digital communications, equalisation errors, equalisers, error analysis, least squares approximations, linear systems, linear time-invariant channels, linear time-invariant model, noisy channel output, online test, recursive estimation, recursive least squares algorithm, RLS algorithm, signal detection, simulation, telecommunication channels, transmitted symbol estimates

Equalisation errors result from discrepancies between transmitted symbols and their estimates at the channel equaliser output in a digital communication system. This paper presents an on-line test to detect the occurrence of equalisation errors without direct access to the channel input. The test draws on the observation that for linear time-invariant (LTI) channels the relationship between transmitted symbol estimates generated by the equaliser and the noisy channel output can be represented by an underlying linear time-invariant model if and only if no equalisation errors are present in the sequence of transmitted symbol estimates. The presence of equalisation errors renders this relationship time-varying, of which the occurrence is detected by the proposed on-line test using the recursive least squares (RLS) algorithm. Simulation studies corroborate the good detection performance of the test


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