LDPC (Low Density Parity Check) coded modulation hybrid...

Details LDPC (Low Density Parity Check) coded modulation hybrid... LDPC (Low Density Parity Check) coded modulation hybrid...

2007-02-01

2008-11-11

Chase, Shelly A (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

Reexamination Certificate

active

07451386

ABSTRACT:
LDPC (Low Density Parity Check) coded modulation hybrid decoding. A novel approach is presented wherein a combination of bit decoding and symbol level decoding (e.g., hybrid decoding) is performed for LDPC coded signals. Check node updating and symbol node updating are successively and alternatively performed on bit edge messages for a predetermined number of decoding iterations or until a sufficient degree of precision is achieved. The symbol node updating of the bit edge messages involves using symbol metrics corresponding to the symbol being decoded as well as the bit edge messages most recently updated by check node updating. The check node updating of the bit edge messages involves using the bit edge messages most recently updated by symbol node updating. The symbol node updating also involves computing possible soft symbol estimates for the symbol during each decoding iteration.

REFERENCES:
Matsumoto et al., Blind synchronization with enhanced sum product algorithm for LDPC codes, 2002, IEEE, p. 966 to 970.
Tian et al., Construction of irregular LDPC codes with low error follor, 2003, IEEE, p. 3125-3129.

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