Excavating
Patent
1994-08-31
1998-08-04
Envall, Jr., Roy N.
Excavating
371 43, G06F 1100, G08C 2500, H03M 1300, H04L 100
Patent
active
057905665
ABSTRACT:
A circuit and method for depuncturing data in the receiver circuitry of a digital communications system. The depuncturing circuit includes a multiplexer circuit that receives a punctured stream of data and a delayed version of the punctured stream of data. The multiplexer circuit generates a multiplexer output which can be either a bit from the punctured stream of data, or a bit from the delayed version of the punctured stream of data. A control circuit is coupled to the multiplexer circuit to select which multiplexer input appears on the multiplexer output. The control circuit selects the multiplexer output according to a depuncture pattern that reproduces the pre-punctured order of the data stream. The control circuit may be a counter coupled to a decoder which is coupled to the multiplexer. The decoder may be specially designed to decode the predetermined depuncture pattern and rate, and the counter controls the decoder's movement through the depuncture pattern and rate. Alternatively, the decoder may be a programmable device, allowing the designer to program the desired depuncture pattern and rate into the decoder.
REFERENCES:
patent: 4675724 (1987-06-01), Wagner
patent: 4939734 (1990-07-01), Heichler
patent: 5019823 (1991-05-01), Bream et al.
patent: 5029331 (1991-07-01), Heichler et al.
Denson-Low Wanda
Envall Jr. Roy N.
Hughes Electronics
Moise Emmanuel L.
Whelan J.
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