Feedback compensation detector for a direct conversion...

Details Feedback compensation detector for a direct conversion... Feedback compensation detector for a direct conversion...

2006-01-17

2006-01-17

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter

Noise or interference elimination

C455S126000, C455S114200, C375S296000, C330S149000

Reexamination Certificate

active

06987954

ABSTRACT:
A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.

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patent: 6766150 (2004-07-01), Johnson

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