Digital radio receiver which detects when a portion of a burst i

Details Digital radio receiver which detects when a portion of a burst i Digital radio receiver which detects when a portion of a burst i

1992-09-28

1996-03-12

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

3701101, H04J 316

Patent

active

054992460

ABSTRACT:
A method of receiving data transmitted in a burst-mode radio communications such as GSM. Prior to transmission a set of first data elements (bits) relating to a first message which may be associated with a first channel type (e.g. a traffic channel (TCH) in GSM) has selected bits substituted or "stolen" by data elements (bits) relating to a second message which may be associated with a second channel type (e.g. a fast associated channel FACCH in GSM). The data elements relating to the first and second messages are interleaved over the same or a different number of bursts. In a normal GSM traffic burst two single-bit flags are set to `1` to indicate respectively when the even bits or the odd bits of the burst have been stolen for FACCH data. A detector (5) is used to monitor the flags from the same number of bursts over which the FACCH is interleaved. In order to improve the chance of detecting a FACCH in noisy conditions a majority-vote circuit (9) is employed whereby a FACCH decode is initiated if the number of detected flags set to `1` exceeds a threshold value. Specifically, in the case of FACCH, the threshold value may be 5-8, i.e more than half the number of bursts over which the FACCH data is interleaved.

REFERENCES:
patent: 4757499 (1988-07-01), Gorshe
patent: 5093830 (1992-03-01), Nunter
patent: 5199031 (1993-03-01), Dahlin
patent: 5245611 (1993-09-01), Ling et al.
patent: 5384782 (1995-01-01), Elms
Goodman, David J.; "Evolution of Wireless Information Networks"; vol. 2, No. 1, Fevrier, 1991, Milano; pp. 105-113; search report also enclosed.
GSM specification, ver. 3.5.1, GSM Recommendation 05.03 (Jan. 1991).

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