Method of detecting the channel identity of a number of channels

Details Method of detecting the channel identity of a number of channels Method of detecting the channel identity of a number of channels

1992-09-09

1994-08-23

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 10, 371 43, H04L 2706

Patent

active

053414012

ABSTRACT:
A method of detecting the identity of a radio channel and to ascertain whether the channel is a control channel or a traffic channel, in conjunction with convolution decoding in a mobile radio receiver. Channel identification is effected without such complete decoding. Part of a data block is decoded in accordance with the Viterbi algorithm as though the block represented a control channel. If the metric obtained after a given number of nodes is smaller than a given number of threshold values, the channel is considered to be a control channel and is thereafter decoded as such a channel. If the metric is greater than the threshold value, the channel is decoded as a speech channel.

REFERENCES:
patent: 4500994 (1985-02-01), McCallister et al.
patent: 4578800 (1986-03-01), Yasuda et al.
patent: 5157672 (1992-10-01), Kondou et al.
EIA-TIA Interim Standard IS-54, p. 7 (Jan. 1991).
EIA-TIA Interim Standard IS-54A, p. 61 (Jan. 1991).
EIA-TIA Interim Standard IS-54A, pp. 57-67 (Jan. 1991).
EIA-TIA Interim Standard IS-54A, pp .130-134 (Jan. 1991).
R. E. Blahut, "Theory and Practice of Error Control Codes", Addison Wesley Publishing Company, ISBN 0-201-10102-5, pp. 347-388 (1983).
G. D. Forney, "The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, pp. 267-278 (Mar. 1973).

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