Sets of rate-compatible universal turbo codes nearly optimized over various rates and interleaver sizes
First Claim
1. A method comprising:
- generating a first set of parity bits based on information bits and a second set of parity bits based on interleaved information bits,wherein the first set of parity bits and the second set of parity bits correspond to respective constituent codes that are universally adapted to accommodate a variety of interleaver depths and code rates,wherein the sets of parity bits are punctured according to one of the code rates to output a coded signal.
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Abstract
A method and apparatus for Turbo encoding uses a set of rate-compatible Turbo Codes optimized at high code rates and derived from a universal constituent code. The Turbo Codes have rate-compatible puncturing patterns.
The method comprises: encoding a signal at a first and second encoder using a best rate 1/2 constituent code universal with higher code rates, the first encoder and the second encoder each producing a respective plurality of parity bits for each information bit; puncturing the respective plurality of parity bits at each encoder with a higher rate best puncturing patterns; and puncturing the respective plurality of parity bits at each encoder with a lower rate best puncturing pattern. In a variation, the best rate 1/2 constituent code represents a concatenation of polynomials 1+D2+D3 (octal 13) and 1+D+D3 (octal 15), D a data bit. A Turbo Encoder is provided which has hardware to implement the method.
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Citations
18 Claims
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1. A method comprising:
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generating a first set of parity bits based on information bits and a second set of parity bits based on interleaved information bits, wherein the first set of parity bits and the second set of parity bits correspond to respective constituent codes that are universally adapted to accommodate a variety of interleaver depths and code rates, wherein the sets of parity bits are punctured according to one of the code rates to output a coded signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmitter comprising:
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an encoding circuit configured to generate a first set of parity bits based on information bits and a second set of parity bits based on interleaved information bits, wherein the first set of parity bits and the second set of parity bits correspond to respective constituent codes that are universally adapted to accommodate a variety of interleaver depths and code rates, wherein the sets of parity bits are punctured according to one of the code rates to output a coded signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus comprising:
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a first encoder configured to received information bits and to generate a first set of parity bits; a second encoder configured to generated a second set of parity bits; and an interleaver coupled to the first encoder and the second encoder, the interleaver being configured to randomize order of the information bits to the second encoder, wherein the first set of parity bits and the second set of parity bits correspond to respective constituent codes that are universally adapted to accommodate a variety of interleaver depths and code rates. - View Dependent Claims (15, 16, 17, 18)
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Specification