Variable transmission bit rate discrimination method and apparat

Details Variable transmission bit rate discrimination method and apparat Variable transmission bit rate discrimination method and apparat

1995-11-13

1997-06-10

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, 371 43, H04L 2706

Patent

active

056384084

ABSTRACT:
The invention provides a variable bit rate discrimination method and apparatus wherein a transmission bit rate of data received by a mobile station in a mobile communication which employs a spectrum spreading method can be discriminated readily to realize reduction in time required for decoding processing and miniaturization in circuit scale. A variable bit rate including four different transmission bit rates is used as a transmission rate of a traffic channel from a base station to a mobile station, and transmission data are encoded using convolutional encoder for error correction and transmitted. In the mobile station, received data are decoded for the four individual transmission bit rates using Viterbi decoders to obtain path metric values which are sum totals of errors of the received data. Then, one of the transmission bit rates which exhibits a lowest one of the path metric values is selected as a bit rate used for transmission of the transmission data. Consequently, after Viterbi decoding, no further encoding is required.

REFERENCES:
patent: 5050191 (1991-09-01), No
patent: 5134635 (1992-07-01), Hong et al.
patent: 5457705 (1995-10-01), Todoroki
J.K. Hinderling, et al., "CDMA Mobile Station Modem ASIC", EIII Journal of Solid-State Circuits, vol. 28, No. 3, Mar. 1993, pp. 253-260.

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