Patent · US Active

D.C. offset estimation

US8976692B2 · kind B2 · utility

1Cited by

6References

15Claims

0Family size

Assignee

ST-ERICSSON SA · CH

Inventors

Jonas Persson · Lund, SE
Sven Mattisson · Bjärred, SE

Key dates

Filing date	Jan 20, 2011
Grant date	Mar 10, 2015
Priority date	—
Expiry date	Feb 28, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2027/0016
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A combination of a phase shifter, a measurement receiver, and an offset estimator enable the d.c. offset in the transmit path of a quadrature transmitter to be distinguished from the d.c. offset in the measurement receiver. The measurement receiver performs a first measurement on the transmit path output with a “normal” phase shift of 0 degrees and 90 degrees for in-phase (I) and quadrature (Q) components, and a second measurement with a “special” phase shift for the I and Q components. In one embodiment, the “special” phase shift for the I and Q components is 180 degrees and 270 degrees, respectively.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.