Error correcting using signal anomaly as a hint

Details Error correcting using signal anomaly as a hint Error correcting using signal anomaly as a hint

1999-01-27

2001-09-25

Baker, Stephen M. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

Reexamination Certificate

active

06295625

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to correcting of errors in data by using error correcting codes and signal anomalies pointing to suspected corrupted bits.
PRIOR ART
Error correcting codes (ECCs) have long been used to detect and correct errors in digital data. Additionally, it is known to examine a received signal for anomalies caused by noise or other conditions on the transmission media, and to correlate the anomalies with specific bits. For instance, a spike or phase shift may point to a potentially corrupted bit, and the state of that bit may be changed if parity is incorrect without the change. The use of this technology is described in the following U.S. Pat. Nos. 5,828.67; 5,461,629 and 5,195,098.
As will be seen the present invention extends the use of the hint signal in connection with an ECC.
SUMMARY OF THE INVENTION
An improvement in a method for correcting errors in a received signal where a hint based on signal anomalies is developed which points to a suspected error in the received signal is described. Signal anomalies are prioritized. The received signal is examined to determine the highest priority anomalies that are present and these are used to point to suspected errors.
In one embodiment, the two signal anomalies used are the delta phase pointer and the realigning of the IQ pointer.


REFERENCES:
patent: 4763331 (1988-08-01), Matsumoto
patent: 5195098 (1993-03-01), Johnson et al.
patent: 5461629 (1995-10-01), Sutterlin et al.
patent: 5828676 (1998-10-01), Hurlbut et al.
patent: SHO 62-48126 (1987-03-01), None
patent: HEI 2-113341 (1990-04-01), None
Chase, “A Class of Algorithms for Decoding Block Codes With Channel Measurement Information”, IEEE Trans. on Information Theory, vol. IT-18, No. 1, Jan. 1972, pp. 170-182.*
Matsumoto, “Soft Decision Decoding Of Block Codes Using Received Signal Envelopes In Fading Channels”, 1988 Intl. Communications Conf., pp. 756-761.*
Nordstrom, Alan W. and Robinson, John P., “An Optimum Nonlinear Code”Inform. Contr., vol. 11, pp. 613-616, Nov./Dec. 1967.

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