RF receiver phase correction circuit using cordic and vector...

Details RF receiver phase correction circuit using cordic and vector... RF receiver phase correction circuit using cordic and vector...

2006-05-02

2006-05-02

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Receivers

Angle modulation

C375S332000, C329S304000

Reexamination Certificate

active

07039130

ABSTRACT:
A phase tracking circuit for use in a receiver having a raw in-phase (I) signal and a raw quadrature (Q) signal, where the raw I and Q signals have M discrete signal levels defining an M×M constellation. The phase tracking circuit corrects a phase error rotation angle φ associated with the M×M constellation. The phase tracking circuit comprising: 1) a phase rotation circuit for receiving and rotating the raw (I,Q) input vectors by an expected correction angle to produce corrected (I*,Q*) vectors; 2) a phase error calculation circuit for rotating each corrected (I*,Q*) vectors into the first quadrant, converting the rotated (I*,Q*) vectors to polar coordinates, subtracting an angle of each converted (I*,Q*) vectors from 45 degrees to produce difference angles, and adding each difference angle to the expected correction angle to produce an estimated correction angle value; and 3) an averaging circuit for calculating an average vector value from N estimated correction angle values, wherein the expected correction angle is derived from the average vector value.

REFERENCES:
patent: 5049830 (1991-09-01), Yoshida
patent: 5712870 (1998-01-01), Petrick
patent: 6363124 (2002-03-01), Cochran
patent: 6625231 (2003-09-01), Shen
patent: 6781447 (2004-08-01), Linsky et al.

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