Quadrature imbalance estimation using unbiased training...

Details Quadrature imbalance estimation using unbiased training... Quadrature imbalance estimation using unbiased training...

2007-09-11

2011-11-22

Patel, Dhaval (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S141000, C375S231000, C375S260000, C375S267000, C375S296000, C375S316000, C375S324000

Reexamination Certificate

active

08064550

ABSTRACT:
A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a complex plane, and includes predetermined reference signals (p) at frequency +f and predetermined mirror signals (pm) at frequency −f. The unbiased training sequence is processed, generating a sequence of processed symbols (y) at frequency +f, representing complex plane information in the unbiased training sequence. Each processed symbol (y) is multiplied by the mirror signal (pm), and an unbiased quadrature imbalance estimate Bmis obtained at frequency (−f). Using quadrature imbalance estimates, channel estimates, and processed symbols, an imbalance-corrected symbol can be generated.

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