Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2005-03-29
2005-03-29
Decady, Albert (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C714S768000, C714S784000
Reexamination Certificate
active
06874115
ABSTRACT:
Techniques are disclosed for processing received information in a communication system, such that performance is significantly improved in the presence of certain types of interference, e.g., partial-band interference. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of an AM or FM host carrier signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The compressed digital audio information in the sidebands is encoded using an error correcting code such as a Reed-Solomon (RS) code. A receiver attempts to detect interference within a designated portion of a given one of the sidebands. If the interference is detected, the receiver eliminates the portion of the frequency band from consideration in the decoding process by using a fixed-erasure decoding (FED) technique to decode the error correcting code. If the interference is not detected, the receiver utilizes the designated portion of the sideband in the decoding process by using a hard-decision decoding (HDD) technique. Advantageously, this multi-mode approach of the present invention provides significantly reduced complexity relative to conventional maximum likelihood decoding, and also provides a block error flag for use in error concealment in an audio decoder. In addition, the invention provides improved performance relative to conventional systems in terms of reducing the probability that a block error flag will be generated, while also providing a manageable probability of undetected errors.
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Laneman Jerry Nicholas
Sundberg Carl-Erik Wilhelm
Agere Systems Inc.
Chaudry Mujtaba
De'cady Albert
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