RF receiving apparatus and method for removing leakage component of received signal using local signal
First Claim
Patent Images
1. A radio frequency (RF) receiver comprising:
- a noise removing unit that estimates a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal, said noise removing unit removing the noise signal that is estimated, from the received signal; and
a receiving unit that performs a frequency-down conversion of the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal,wherein the phase signal and the gain signal are generated from a phase value and an amplitude value of the received signal that is down-converted in the receiving unit respectively and fed back to the noise removing unit; and
wherein the noise removing unit comprises;
a phase correction circuit that generates a phase controlled local signal in which the phase of the local signal is controlled according to the phase signal; and
an amplitude correction circuit that generates the estimated noise signal, which is a signal in which a gain of the phase controlled local signal is controlled, according to the gain signal and the phase controlled local signal, andthe estimated noise signal is removed from the received signal by a current difference between the received signal and the noise signal that is estimated.
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Abstract
A radio frequency (RF) receiver and receiving method are provided which can remove a leakage component from a received signal by using a local signal. In the RF receiver, a noise removing unit controls a gain and a phase of a local signal LOI according to a phase THETA and a gain AMPTD detected in a MODEM, estimates a signal Vcal corresponding to a noise component introduced into a received RF signal RXIN, and removes the estimated signal Vcal from the received RF signal RXIN. In this manner, a clean RF signal RXO, which does not include a noise component, is frequency-down converted in a receiving unit.
80 Citations
17 Claims
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1. A radio frequency (RF) receiver comprising:
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a noise removing unit that estimates a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal, said noise removing unit removing the noise signal that is estimated, from the received signal; and a receiving unit that performs a frequency-down conversion of the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal, wherein the phase signal and the gain signal are generated from a phase value and an amplitude value of the received signal that is down-converted in the receiving unit respectively and fed back to the noise removing unit; and wherein the noise removing unit comprises; a phase correction circuit that generates a phase controlled local signal in which the phase of the local signal is controlled according to the phase signal; and an amplitude correction circuit that generates the estimated noise signal, which is a signal in which a gain of the phase controlled local signal is controlled, according to the gain signal and the phase controlled local signal, and the estimated noise signal is removed from the received signal by a current difference between the received signal and the noise signal that is estimated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency (RF) receiving method comprising:
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estimating a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal; removing the noise signal that is estimated from the received signal; frequency-down converting the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal in a receiving unit; and generating and feeding back to a noise removing unit the phase signal and the gain signal from a phase value and an amplitude value of the down converted signal respectively; wherein a phase controlled local signal is generated in which the phase of the local signal is controlled according to the phase signal, and a gain of the phase controlled local signal is controlled by controlling transconductance of a transistor according to the gain signal and the phase controlled local signal, and wherein the noise signal that is estimated is removed from the received signal by a current difference between the received signal and the noise signal that is estimated. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A computer readable recording medium storing a program for implementing a radio frequency (RF) receiving method, the method comprising:
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estimating a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal; removing the noise signal that is estimated from the received signal; frequency-down converting the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal in a receiving unit; and generating and feeding back to a noise removing unit the phase signal and the gain signal from a phase value and an amplitude value of the frequency-down converted signal respectively; wherein a phase controlled local signal is generated in which the phase of the local signal is controlled according to the phase signal, and a gain of the phase controlled local signal is controlled by controlling transconductance of a transistor according to the gain signal and the phase controlled local signal, and wherein the noise signal that is estimated is removed from the received signal by a current difference between the received signal and the noise signal that is estimated.
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17. A transceiver comprising:
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a directional coupler that couples transmission and reception of radio frequency (RF) signal to an antenna; and an RF receiver comprising; a noise removing unit that estimates a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal, said noise removing unit removing the noise signal that is estimated from the received signal, a receiving unit that performs a frequency-down conversion of the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal, wherein a noise signal of a transmitting signal is introduced into the received signal from the directional coupler, wherein the phase signal and the gain signal are generated from a phase value and an amplitude value of the received signal that is down converted respectively in the receiving unit and fed back to the noise removing unit; and wherein said noise removing unit comprise; a phase correction circuit that generates a phase controlled local signal in which the phase of the local signal is controlled according to the phase signal; and an amplitude correction circuit that generates the estimated noise signal, which is a signal in which a gain of the phase controlled local signal is controlled, according to the gain signal and the phase controlled local signal and the estimated noise signal is removed from the received signal by the current difference between the received difference between the received signal and the noise signal that is estimated.
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Specification