Method and apparatus for detecting the sub-rate of a punctured d

Details Method and apparatus for detecting the sub-rate of a punctured d Method and apparatus for detecting the sub-rate of a punctured d

1996-06-21

2000-08-29

Luther, William

Pulse or digital communications

Testing

Data rate

375340, H04B 1700

Patent

active

061119121

ABSTRACT:
A method for detecting the transmission sub-rate of a data packet whose symbols are punctured prior to transmission as with an IS-95 transmission with a 13 kbps speech encoder. Sub-rates are detected by first regrouping the received symbols so as to exclude those symbols for which one or more of its repetitions were punctured. The regrouped symbols are then examined for consecutive identical soft decision symbols, i.e., the repetitive pattern used by the transmitter to mask the sub-rate, with statistical methods used to account for the effects of noise and power bit insertion. The repetitive pattern is then matched to the appropriate sub-rate.

REFERENCES:
patent: 5566206 (1996-10-01), Butler et al.
"Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Standard," TIA/EIA Interim Standard 95 (Jul. 1993).
E. Cohen and H. Lou, "Multi-Rate Detection for the IS-95 CDMA forward traffic channels," IEEE Globecom '95 (Nov. 1995).
Personal Station/Base Station Compatibility Requirements for 1.8-2.0 GHz CDMA personal communication system, ANSI J-STD-008, (Mar. 1995).
H. Lou, "Implementing the Viterbi Algorithm," IEEE Signal Processing Magazine, vol. 12, No. 5, pp. 42-52 (Sep. 1995).
G.D. Forney Jr., "The Viterbi Algorithm," IEEE Proceedings, vol. IT-61, No. 3, pp. 268-278 (Mar. 1973).

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