Method of double weighting parallel interference cancellation

Details Method of double weighting parallel interference cancellation Method of double weighting parallel interference cancellation

2008-01-22

2008-01-22

Nguyen, Lee (Department: 2618)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C375S144000

Reexamination Certificate

active

07321581

ABSTRACT:
A method for double weighting parallel interference cancellation in CDMA mobile communication system, integrates ideas of both partial weighting method and weighting method based on Bayes rule. When making a decision on each symbol of the user, calculating reliability coefficient of a decision result on the symbol of the user according to the weighting algorithm based on Bayes rule; weighting regenerated signal of the symbol of the user with the reliability coefficient. During process of MAI estimating and removing, obtaining the MAI on the expected user from weighted regenerated signal of other users in chip level; and then setting a weight value, weighting the MAI with the weight value. Finally, removing weighted MAI from received signal, which means partially removing MAI produced by other users on the expected user. At the same time, the present invention also discloses a double weighting PIC method with simplified algorithm, which transfers weighting in chip level to weighting in symbol level, replacing a Hyperbolic tangent decision with a piecewise linear decision method or a look-up table method.

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