Channel estimation and detection for digital communication syste

Details Channel estimation and detection for digital communication syste Channel estimation and detection for digital communication syste

1987-04-14

1989-08-29

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 43, 375101, H04L 2700

Patent

active

048624837

ABSTRACT:
The attenuation and phase change of a communication channel have to be estimated for near-maximum-likelihood detection and this presents severe difficulties where rapid fading occurs especially in communication between mobile stations in cellular radio. A number of vectors are stored which represent possible sequences of received data symbols and these vectors are expanded on receipt of each further digital sample. Costs, representing a measure of the likelihood that sequences are correct, the lower the cost the higher the likelihood, are then derived for each vector on the basis of stored prediction of channel performance. Next the earliest data symbols in the vector with lowest costs are output as detected symbols and then the vectors with lowest costs as selected for storage in place of the original vectors. New channel predictions are formed from channel estimates for the current sample and stored for use in the next iteration.

REFERENCES:
patent: 4545054 (1985-10-01), Davis
patent: 4564952 (1986-01-01), Karabinis et al.
patent: 4583078 (1986-04-01), Shenoy et al.
patent: 4630032 (1986-12-01), Gordon et al.
patent: 4710746 (1987-12-01), Shimoda et al.
"Modems for Cellular Mobile Radio" IEEE Colloquium on Digital Mobile Radio: London, Oct. 1985, pp. 861-866.
"Channel Estimation for an HF Radio Link" IEE Proc. vol. 128, Pt. F. No. 1, Feb. 1981, pp.33-42.
"Near-Maximum Likelihood Detection Processes for Distorted Digital signals" Radio & Electronic Engineer vol. 48, NO. 6 pp. 301-309.
"Detection of Digital Signals Transmitted over a known time-varying Channel" IEEE Proc. vol. 128 Pt F., No. 3 Jun. 1981 pp. 167-172.

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