Patent ID: 8155605
Filing Date: 2012-04-10
Classification: H04B,H04N

Abstract:
1. An apparatus for feedforward-type phase noise elimination in a portable terminal, comprising: a phase noise detection unit configured to detect phase noise using an input signal and an output signal of a power amplifier of a first Radio Frequency (RF) transmission unit for transmitting a first RF transmission signal using an antenna; a phase noise elimination unit configured to combine the detected phase noise, detected by the phase noise detection unit, with the first RF transmission signal, output from the power amplifier, thus eliminating phase noise from the first RF transmission signal, passed through the power amplifier, and to output a phase noise-eliminated first RF transmission signal; and a phase noise correction unit configured to branch part of a second RF reception signal, which includes phase noise of the first RF transmission signal corresponding to a second RF signal band and is received from a second RF reception unit, from the second RF reception signal, thereby correcting the detected phase noise detected by the phase noise detection unit, wherein the phase noise correction unit comprises: a coupler configured for branching part of the second RF reception signal, which includes phase noise of the first RF transmission signal and is output from the second RF reception unit, from the second RF reception signal; and a subtractor configured for generating a corrected phase noise signal by subtracting the second RF reception signal, output from the coupler, from phase-reversed phase noise detected by the phase noise detection unit, and configured for outputting the corrected phase noise signal to the phase noise elimination unit.