Method of correcting carrier leak in a transmitter

Details Method of correcting carrier leak in a transmitter Method of correcting carrier leak in a transmitter

1995-01-27

1996-11-12

Faile, Andrew

Telecommunications

Transmitter

With feedback of modulated output signal

455115, 330149, 332107, 375296, H01Q 1112

Patent

active

055749941

ABSTRACT:
A method of suppressing generation of carrier leak in a transmitter and reducing deterioration of communication quality comprises the steps of outputting DC elements (I, Q) from a DSP gradually changing the voltage values, measuring a sum of the DC elements (.DELTA.I.sub.DC, .DELTA.Q.sub.DC) and DC elements (I, Q), storing the DC elements (I, Q), when the above sum is equal to a specified value (herein, 0 V), as DC elements -.DELTA.I.sub.DC, -.DELTA.Q.sub.DC for correction, and correcting the DC elements (I.sub.DC, Q.sub.DC) (DC elements obtained by amplifying DC elements for (I, Q) channels demodulated by a quadrature demodulator during transmission) using the DC elements (-.DELTA.I.sub.DC, -.DELTA.Q.sub.DC) for correction during transmission.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata
patent: 4933986 (1990-06-01), Leitch
patent: 5351016 (1994-09-01), Dent
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5396196 (1995-03-01), Blodgett
patent: 5404378 (1995-04-01), Kimura
patent: 5469105 (1995-11-01), Sparks

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