Radio apparatus and offset compensating method

Details Radio apparatus and offset compensating method Radio apparatus and offset compensating method

1998-11-16

2000-06-27

Mullen, Thomas

Telecommunications

Transmitter

With feedback of modulated output signal

330149, 375297, H04B 104

Patent

active

060816988

ABSTRACT:
Disclosed is a radio apparatus in which modulating signals (I, Q signals) from an arithmetic/control unit are converted to analog signals, which are then applied to an orthogonal modulator. A modulated wave for transmission, which has been produced by orthogonally modulating a reference carrier wave by the modulating signals, is demodulated by the orthogonal detector. The arithmetic/control unit compares the modulating signals and the demodulated signals and, based upon the comparison, updates distortion compensation coefficients and applies pre-distortion processing to the modulating signal using the distortion compensation coefficients. Leakage carrier produced due to offset of the orthogonal modulator is detected and the arithmetic/control unit adjusts the level of the modulating signals or shifts the phase of the reference carrier wave in such a manner that the leakage carrier (offset) becomes zero.

REFERENCES:
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patent: 4985688 (1991-01-01), Nagata
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patent: 5191597 (1993-03-01), Ekelund et al.
patent: 5396190 (1995-03-01), Murata
patent: 5404579 (1995-04-01), Obayashi et al.
patent: 5452473 (1995-09-01), Weiland et al.
patent: 5870668 (1999-02-01), Takano et al.

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