Hybrid automatic repeat request system and method

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction

Reexamination Certificate

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C714S748000

Reexamination Certificate

active

07000174

ABSTRACT:
A data communication method and system for uniform arbitrary puncturing of parity bits generated by an encoder. The parity bits are stored in a buffer, and an a-bit accumulator is incremented to a predetermined initial value. For each parity bit in the buffer, the following steps are performed: the accumulator is incremented by a predetermined increment value, and if the accumulator overflows, the parity bit is selected for transmission. The predetermined initial value and the predetermined increment value are selected to achieve a desired amount of puncturing. In a further hybrid automatic repeat request (HARQ) communication method and system, the parity bits are generated by a low density parity check (LDPC) coder.

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Miyagi, Masayoshi, et al., “Selective Repeat Type-II Hybrid FEC/ARQ Systems Using Concatenated Codes,” Electronics and Communications in Japan, Part I, vol. 76, No. 6, Jun. 1993, pp. 25-34.
Mantha, Ramesh, et al., “An Efficient Software Implementation of a Variable Rate Modem,” International Mobile Satellite Conference, Jun. 1995, pp. 8-12.

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