Radio apparatus, method for receiving its signal, method for measuring its filter coefficient, and program for measuring its filter coefficient
First Claim
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1. A radio apparatus using a plurality of antennas to receive a signal, comprising:
- a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing;
a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals;
a plurality of filter units receiving said digital signals from said plurality of analog-digital converters, respectively, to filter said digital signals to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits; and
a digital signal extraction unit receiving signals from said plurality of filter units, respectively, to subject said signals to a digital signal processing to extract a received signal.
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Abstract
Corresponding to antennas analog RF circuits are provided and their outputs are converted by A/D converters to digital signals. Subsequent thereto and preceding an adaptive array processing, correction filters are arranged. Each correction filter has a filter coefficient for compensating for a difference between a characteristic of an analog RF circuit corresponding thereto and an ideal circuit characteristic. Thus an error of a characteristic between the analog RF circuits can be compensated for. The series of operations are implemented by software.
120 Citations
20 Claims
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1. A radio apparatus using a plurality of antennas to receive a signal, comprising:
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a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing; a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals; a plurality of filter units receiving said digital signals from said plurality of analog-digital converters, respectively, to filter said digital signals to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits; and a digital signal extraction unit receiving signals from said plurality of filter units, respectively, to subject said signals to a digital signal processing to extract a received signal. - View Dependent Claims (2, 3, 4)
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5. A method of receiving a signal in a radio apparatus having a plurality of antennas, said radio apparatus including a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing, and a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals, the method comprising the step of:
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filtering said digital signals output from said plurality of analog-digital converters to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits; and subjecting said filtered digital signals to a digital signal processing to extract a received signal. - View Dependent Claims (6, 7)
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8. A method of measuring a filter coefficient of a radio apparatus using a plurality of antennas to receive a signal, said radio apparatus including
a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing; -
a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals; a plurality of filter units receiving said digital signals from said plurality of analog-digital converters, respectively, to filter said digital signals to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits; and a digital signal extraction unit receiving signals from said plurality of filter units respectively, to subject said signals to a digital signal processing to extract a received signal, the method comprising the steps of; determining a transmission frequency compensating for a frequency offset in said plurality of antennas; determining a sampling-timing allowing a sampling error in said analog-digital converter to have an optimal value; and calculating a filter coefficient of said filter units from a signal of said transmission frequency determined and said sampling-timing determined. - View Dependent Claims (9, 10, 11, 12)
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13. A method of measuring a filter coefficient of a radio apparatus using a plurality of antennas to receive a signal, said radio apparatus including
a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing, a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals, a plurality of filter units receiving said digital signals from said plurality of analog-digital converters, respectively, to filter said digital signals to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits, and a digital signal extraction unit receiving signals from said plurality of filter units respectively, to subject said signals to a digital signal processing to extract a received signal, the method comprising the steps of: -
determining whether a signal received from a mobile terminal at said plurality of antennas satisfies a predetermined condition; holding a signal received from a mobile terminal at said plurality of antennas, the mobile device satisfying said predetermined condition; and calculating a filter coefficient of said filter units of said signal received and held. - View Dependent Claims (14, 15, 16)
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17. A program to measure a filter coefficient of a radio apparatus using a plurality of antennas to receive a signal, said radio apparatus including
a plurality of analog circuits provided to correspond to said plurality of antennas and subjecting signals received at said plurality of antennas, respectively, to an analog signal processing, a plurality of analog-digital converters receiving signals from said plurality of analog circuits, respectively, to convert said signals to digital signals, a plurality of filter units receiving said digital signals from said plurality of analog-digital converters, respectively, to filter said digital signals to compensate for distortion in waveform resulting from a difference of a characteristic between said plurality of analog circuits, and a digital signal extraction unit receiving signals from said plurality of filter units respectively, to subject said signals to a digital signal processing to extract a received signal, the program causing a computer to effect the steps of: -
determining whether a signal received from a mobile terminal at said plurality of antennas satisfies a predetermined condition; holding a signal received from a mobile terminal at said plurality of antennas, the mobile device satisfying said predetermined condition; and calculating a filter coefficient of said filter units of said signal received and held. - View Dependent Claims (18, 19, 20)
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Specification