Punctured convolutional encoder
DCFirst Claim
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1. A method for convolutionally encoding digital data with a rate 4/5 convolutional code, comprising the steps of:
- puncturing a rate 1/2, sixteen state convolutional code based on octal generators 25,37 to rate 4/5 using a puncture map of ##EQU14## wherein ν
=4; and
processing an incoming data stream using said rate 4/5 code.
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Abstract
A method and apparatus are provided for convolutionally encoding digital data with a rate 4/5 convolutional code. A nonoptimal rate 1/2, sixteen-state convolutional code is punctured to rate 4/5 using a puncture map of ##EQU1## and octal generators 25, 37 wherein ν=4. An incoming data stream is processed using the rate 4/5 code. Punctured rate 3/4 and 6/7 codes are also provided.
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Citations
4 Claims
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1. A method for convolutionally encoding digital data with a rate 4/5 convolutional code, comprising the steps of:
puncturing a rate 1/2, sixteen state convolutional code based on octal generators 25,37 to rate 4/5 using a puncture map of ##EQU14## wherein ν
=4; and
processing an incoming data stream using said rate 4/5 code.
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2. A rate 4/5 convolutional encoder comprising:
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a rate 1/2, sixteen state convolutional encoder based on octal generators 25,37 coupled to receive an input stream to be encoded; and means for puncturing the code from said rate 1/2 encoder to rate 4/5 using a puncture map of ##EQU15## wherein ν
=4.
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3. A method for convolutionally encoding digital data with a rate 6/7 convolutional code, comprising the steps of:
puncturing a rate 1/2, sixteen state convolutional code based on octal generators 25,37 to rate 6/7 using a puncture map of ##EQU16## wherein ν
=4; and
processing an incoming data stream using said rate 6/7 code.
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4. A rate 6/7 convolutional encoder comprising:
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a rate 1/2, sixteen state convolutional encoder based on octal generators 25,37 coupled to receive an input stream to be encoded; and means for puncturing the code from said rate 1/2 encoder to rate 6/7 using a puncture map of ##EQU17## wherein ν
=4.
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Specification