Noise and quality detector for use with turbo coded signals

Details Noise and quality detector for use with turbo coded signals Noise and quality detector for use with turbo coded signals

2007-09-18

2007-09-18

Lamarre, Guy (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S760000, C714S786000, C375S341000, C375S262000

Reexamination Certificate

active

10696926

ABSTRACT:
In one aspect this invention provides a method to operate a decoder, and a decoder that operates in accordance with the method. The method includes monitoring, during operation of the decoder on a signal received from a channel, the value of at least one extrinsic value; and based on the monitored at least one value, determining whether the signal comprises a valid code word or comprises only noise. In a preferred, but non-limiting embodiment, the decoder comprises one of a LogMap or a MaxLogMap turbo decoder, and the decoder forms a part of a baseband section of a wideband code division multiple access (WCDMA) user equipment. During the process of decoding rounds the absolute values of extrinsic values tend to increase, provided that the input signal contains a valid code word, as opposed to when the input signal contains only noise, and where determining accurately distinguishes a valid code word from noise, and may also obtain information that is indicative of the quality of the decoding process.

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“Real-Time Algorithms and VLSI Architectures for Soft Output Map Convolutional Decoding”,, Dawid, H., et al., in 6thIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Toronto, Canada, vol. 1, pp. 193-197, Sep. 1995.
“Memory Efficient Implementation of the BCJR Algorithm, in Proceedings of the 2ndInternational Symposium on Turbo Codes and Related Topics”, Huettinger, S. et al., Brest, France, Sep. 4-7, 2000, pp. 479-482.

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