MOBILE TERMINAL AND METHOD OF REDUCING INTERFERING PHASE-NOISE IN THE MOBILE TERMINAL
First Claim
Patent Images
1. A mobile terminal comprising:
- a first radio frequency transmitter/receiver for transmitting and receiving a first radio frequency signal via a first antenna;
a first signal coupler extracting a low power signal from a signal outputted from the first transmitter/receiver;
a second radio frequency receiver receiving a second radio frequency signal via a second antenna;
a phase-noise filter through which a phase-noise signal of the first radio frequency signal corresponding to a second radio frequency receiving band from the signals extracted by the first signal coupler;
a phase shifter for inverting a phase of the phase-noise signal of the first radio frequency signal from the phase-noise filter;
a variable gain amplifier modulating a level of a signal from the phase shifter; and
a signal combiner combining a signal from the variable gain amplifier with the second radio frequency signal from the second antenna and reducing the phase-noise signal of the first radio frequency signal included in the second radio frequency signal.
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Abstract
A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method of reducing interfering phase-noise in the mobile terminal. The mobile terminal includes a first RF transmitter/receiver; a first signal coupler; a phase-noise filter; a phase shifter; a VGA amplifier; and a signal combiner.
15 Citations
18 Claims
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1. A mobile terminal comprising:
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a first radio frequency transmitter/receiver for transmitting and receiving a first radio frequency signal via a first antenna; a first signal coupler extracting a low power signal from a signal outputted from the first transmitter/receiver; a second radio frequency receiver receiving a second radio frequency signal via a second antenna; a phase-noise filter through which a phase-noise signal of the first radio frequency signal corresponding to a second radio frequency receiving band from the signals extracted by the first signal coupler; a phase shifter for inverting a phase of the phase-noise signal of the first radio frequency signal from the phase-noise filter; a variable gain amplifier modulating a level of a signal from the phase shifter; and a signal combiner combining a signal from the variable gain amplifier with the second radio frequency signal from the second antenna and reducing the phase-noise signal of the first radio frequency signal included in the second radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of reducing interfering phase-noise, applied to a mobile terminal including a first radio frequency transmitter/receiver transmitting and receiving a first radio frequency signal via a first antenna, a second radio frequency receiver receiving a second radio frequency signal via a second antenna, and a phase-noise reduction apparatus reducing phase-noise included in the second radio frequency signal by using the first radio frequency signal, the method comprising:
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operating the second radio frequency receiver and the phase-noise reduction apparatus and setting up a phase-noise filter, a phase shifter, and variable gain amplifier, included in the phase-noise reduction apparatus, as a default value; and controlling each main frequency of the phase-noise filter and the phase shifter by using channel information from the second radio frequency receiver and reducing a phase-noise signal included in the second radio frequency signal by using a signal included of the first radio frequency signal, whose phase is inverted.
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17. A method of reducing interfering phase-noise, applied to a mobile terminal including a first radio frequency transmitter/receiver transmitting and receiving a first radio frequency signal via a first antenna, a second radio frequency receiver receiving a second radio frequency signal via a second antenna, and a phase-noise reduction apparatus reducing phase-noise included in the second radio frequency signal by using the first radio frequency signal, the method comprising:
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operating the second radio frequency receiver and the phase-noise reduction apparatus and setting up a phase-noise filter, a phase shifter, and variable gain amplifier, included in the phase-noise reduction apparatus, as a default value; determining whether bit error rate of a present frame from the second radio frequency receiver is higher than a reference bit error rate and determining whether the bit error rate of the present frame is higher than a bit error rate of a previous frame when the bit error rate of the present frame is higher than the reference bit error rate; controlling a phase of the phase shifter and a gain of the variable gain amplifier to be in a direction identical with a previous control direction when the bit error rate of the present frame is lower than the bit error rate of the previous frame and reducing a phase-noise signal included in the second radio frequency signal by using a signal included in the first radio frequency signal, whose phase is inverted; and controlling the phase of the phase shifter and the gain of the variable gain amplifier to be in a direction opposite to the previous control direction when the bit error rate of the present frame is higher than the bit error rate of the previous frame and reducing the phase-noise signal included in the second radio frequency signal by using the signal included in the first radio frequency signal, whose phase is inverted.
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18. A method of reducing interfering phase-noise, applied to a mobile terminal including a first radio frequency transmitter/receiver transmitting and receiving a first radio frequency signal via a first antenna, a second radio frequency receiver receiving a second radio frequency signal via a second antenna, and a phase-noise reduction apparatus reducing phase-noise included in the second radio frequency signal by using the first radio frequency signal, the method comprising:
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operating the second radio frequency receiver and the phase-noise reduction apparatus and setting up a phase-noise filter, a phase shifter, and variable gain amplifier, included in the phase-noise reduction apparatus, as a default value; controlling each main frequency of the phase-noise filter and the phase shifter by using channel information from the second radio frequency receiver and reducing a phase-noise signal included in the second radio frequency signal by using a signal included of the first radio frequency signal, whose phase is inverted; operating the second radio frequency receiver and the phase-noise reduction apparatus and setting up a phase-noise filter, a phase shifter, and variable gain amplifier, included in the phase-noise reduction apparatus, as a default value; determining whether bit error rate of a present frame from the second radio frequency receiver is higher than a reference bit error rate and determining whether the bit error rate of the present frame is higher than a bit error rate of a previous frame when the bit error rate of the present frame is higher than the reference bit error rate; controlling a phase of the phase shifter and a gain of the variable gain amplifier to be in a direction identical with a previous control direction when the bit error rate of the present frame is lower than the bit error rate of the previous frame and reducing a phase-noise signal included in the second radio frequency signal by using a signal included in the first radio frequency signal, whose phase is inverted; and controlling the phase of the phase shifter and the gain of the variable gain amplifier to be in a direction opposite to the previous control direction when the bit error rate of the present frame is higher than the bit error rate of the previous frame and reducing the phase-noise signal included in the second radio frequency signal by using the signal included in the first radio frequency signal, whose phase is inverted.
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Specification