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.
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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.
97 Citations
20 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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; and
generating and feeding back the phase signal and the gain signal from a phase value and an amplitude value of the down converted signal respectively. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. 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; and
generating and feeding back the phase signal and the gain signal from a phase value and an amplitude value of the frequency-down converted signal respectively.
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20. 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.
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Specification