Method and apparatus for I/Q imbalance calibration of a...

Details Method and apparatus for I/Q imbalance calibration of a... Method and apparatus for I/Q imbalance calibration of a...

2006-11-21

2006-11-21

Anderson, Matthew (Department: 2618)

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

C455S115200, C455S067110, C455S024000, C455S108000, C375S324000, C375S355000, C375S232000

Reexamination Certificate

active

07139536

ABSTRACT:
A method for I/Q imbalance calibration of an OFDM system comprising the steps of initializing parameters Ap, Bpand γp, estimating a loop delay factor L, generating a discrete-time test signal x[n], deriving a signal xcom[n] by compensating the test signal x[n] according to a function with parameters Ap, Bpand γp, converting the signal xcom[n] to an analog signal x(t), applying I/Q modulation to the signal x(t) and outputting a modulated signal xmod(t), obtaining a characteristic signal xc(t) of the modulated signal, obtaining a signal xs[n] by sampling the characteristic signal xc(t) and obtaining statistics U1and U2of the signal xs[n], and updating the parameters Ap, Bpand γprespectively by functions of L, U1, U2, and the current values of Ap, Bpand γp.

REFERENCES:
patent: 2003/0228017 (2003-12-01), Beadle et al.
patent: 2004/0207422 (2004-10-01), Lehtinen et al.
patent: 2006/0133548 (2006-06-01), Oh et al.

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