Multi-user carrier frequency offset correction for CDMA systems

Details Multi-user carrier frequency offset correction for CDMA systems Multi-user carrier frequency offset correction for CDMA systems

2007-12-25

2007-12-25

Pham, Chi (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C370S441000, C455S278100

Reexamination Certificate

active

10225963

ABSTRACT:
“Multiple approaches are presented herein to perform CFO correction within CDMA systems having multiple users. Any communication receiver may be adapted to perform the CFO correction in this manner CDM. One approach assumes a diagonal CFO matrix to decouple the different codes' soft symbol decisions, and each soft symbol decision is independently corrected to obtain hard decisions. Another approach employs direct CFO matrix inversion and multiplies it by a despread soft symbol decision vector to obtain corrected soft symbol decisions. Another approach first performs a single-user correction on the despread soft symbol decisions so, which are then sliced to obtain initial hard decisions. In the next step of this particular approach the initial hard decisions are multiplied by the CFO coefficients to obtain an estimate for the undesired ICI, which is then subtracted from the despread soft symbol decisions to obtain cleaner soft symbol decisions, which then can undergo slicing.”

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