Soft decision correction method, receiver using the same,...

Details Soft decision correction method, receiver using the same,... Soft decision correction method, receiver using the same,...

2011-06-28

2011-06-28

Lamarre, Guy J (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C370S344000

Reexamination Certificate

active

07971128

ABSTRACT:
A soft decision value correction method can detect interference occurring in a desired wave and correct a soft decision value where a received power difference between the desired wave and an interference wave is small. A receiver and a program capable of performing the soft decision value correction method are provided. In the receiver an EVM calculator sets a detection distance for a primary modulation symbol of the first subcarrier in the first OFDM symbol as a reference, and calculates an evaluation value ΔEl,mthat is an index of a distance between the primary modulation symbol of the reception signal and the reference. When the evaluation value ΔEl,mis greater than or equal to a normal threshold, a weighting controller infers that interference occurred, and multiplies a soft decision value Wl,m,nby a weighting factor to calculate a corrected soft decision value Vl,m,n.

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Sugiura et al., A study on the reduction of the influence of the interference depended on EVM fluctuation in an OFDM receiver, The 29th Symposium on Information Theory and Its Applications (SITA2006), Hakodate, Hokkaido, Japan, Nov. 28-Dec. 1, 2006.
Notice of Reasons for Rejection mailed on Jun. 8, 2010 issued from the Japanese Patent Office in the corresponding Japanese patent application No. 2006-314354 (with English translation).

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