Pulse or digital communications – Repeaters – Testing
Patent
1992-07-21
1994-07-19
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 99, 375103, H03H 730, H04B 110
Patent
active
053316622
ABSTRACT:
A digital signal is equalized, for example in cellular radio systems, to combat intersymbol interference. Each sample received is associated with an estimated symbol representing the transmitted symbol. The equalization process comprises an iterative stage of intersymbol interference elimination, each iteration comprising for each sample of a set of received samples whose value has not been determined during a previous iteration: comparing said sample with at least one confidence threshold and if said sample exceeds any of said thresholds: associating with said sample an estimated symbol whose value depends on said threshold exceeded, the value of said sample being then determined; and eliminating the intersymbol interference caused to other samples belonging to said set of received samples by said estimated symbol.
REFERENCES:
patent: 4635276 (1987-01-01), Karabinis
patent: 5164962 (1992-11-01), Nakai et al.
J. G. Proakis, Digital Communications, 1989, pp. 548-555.
Forney, "Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference", IEEE Trans. Information Theory, vol. IT-18 No. 3 (May 1972), pp. 363-372.
Abdesselem Ouelid
Desperben Lydie
Kamanou Pierre-Francois
ALCATEL N.V.
Chin Stephen
Kim Kevin
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