OFDM receiver apparatus
First Claim
1. An OFDM receiver apparatus to receive an OFDM signal, comprising:
- a receiver to receive an OFDM signal having a plurality of sub-carriers every symbol;
a distortion estimator which estimates a distortion using each sub-carrier of the sub-carriers of the OFDM signal to generate channel distortion information;
a distortion compensator which subjects the sub-carrier to distortion compensation according to a control signal to generate a distortion-compensated sub-carrier;
a demodulator to demodulate the distortion-compensated sub-carrier;
a phase distortion estimator to generate first phase distortion information indicating a phase distortion of each sub-carrier every symbol, using the distortion-compensated sub-carrier and the distortion information;
a weighting synthesizer to weight the first phase distortion information by a plurality of weighting factors with time function over a plurality of symbol intervals and then synthesize the first phase distortion information, to generate a plurality of second phase distortion information; and
a control signal generator to generate the control signal using the distortion information and the plurality of second phase distortion information.
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Abstract
An OFDM receiver apparatus comprises a receiver to receive an OFDM signal, an estimator to estimate a distortion, a distortion compensator subjecting the sub-carrier to distortion compensation according to a control signal to generate a distortion-compensated sub-carrier, a demodulator to demodulate the distortion-compensated sub-carrier, an estimator to generate first phase distortion information, using the distortion-compensated sub-carrier and the distortion information, a weighting synthesizer to weight the first phase distortion information by weighting factors with time function over symbol intervals and then synthesize the first phase distortion information, to generate second phase distortion information, and a control signal generator to generate the control signal using the distortion information and the second phase distortion information.
25 Citations
19 Claims
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1. An OFDM receiver apparatus to receive an OFDM signal, comprising:
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a receiver to receive an OFDM signal having a plurality of sub-carriers every symbol; a distortion estimator which estimates a distortion using each sub-carrier of the sub-carriers of the OFDM signal to generate channel distortion information; a distortion compensator which subjects the sub-carrier to distortion compensation according to a control signal to generate a distortion-compensated sub-carrier; a demodulator to demodulate the distortion-compensated sub-carrier; a phase distortion estimator to generate first phase distortion information indicating a phase distortion of each sub-carrier every symbol, using the distortion-compensated sub-carrier and the distortion information; a weighting synthesizer to weight the first phase distortion information by a plurality of weighting factors with time function over a plurality of symbol intervals and then synthesize the first phase distortion information, to generate a plurality of second phase distortion information; and a control signal generator to generate the control signal using the distortion information and the plurality of second phase distortion information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An OFDM receiver apparatus to receive an OFDM signal, comprising:
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a receiver to receive an OFDM signal having a plurality of sub-carriers; a distortion estimator which estimates a distortion by using each sub-carrier of the received OFDM signal, to generate distortion information indicating the distortion; a distortion compensator which subjects the sub-carrier to distortion-compensation according to a control signal to generate a distortion-compensated sub-carrier; a demodulator to demodulate the distortion-compensated sub-carrier; a phase distortion estimator which generates first phase distortion information indicating a phase distortion of the distortion-compensated sub-carrier every symbol, using the distortion-compensated sub-carrier and the distortion information; a weighting moving average unit configured to subject the phase distortion information to weighted moving average by using a weighting factor with time function over a plurality of symbol intervals, to generate second phase distortion information; and a control signal generator to generate the control signal by the distortion information and the second phase distortion information. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An OFDM receiver apparatus to receive an OFDM signal, comprising:
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a receiver to receive an OFDM signal including a plurality of sub-carriers every symbol; a channel distortion estimator which estimates a distortion using each sub-carrier of the sub-carriers of the OFDM signal to generate distortion information indicating the distortion; a distortion compensator which subjects the sub-carrier to distortion compensation according to a control signal to generate a distortion-compensated sub-carrier; a demodulator to demodulate the distortion-compensated sub-carrier; a phase distortion estimator to generate first phase distortion information indicating a phase distortion of each sub-carrier every symbol, using the distortion-compensated sub-carrier and the distortion information; a weighting synthesizer to weight the first phase distortion information by a plurality of weighting factors with time function over a plurality of symbol intervals and then synthesize the first phase distortion information, to generate a plurality of second phase distortion information corresponding to the weighting factors; and a control signal generator to generate the control signal using the channel distortion information and the plurality of second phase distortion information substantially to weight the sub-carriers by the weighting factors, individually.
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17. An OFDM receiver comprising:
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a receiver circuit configured to receive an OFDM signal including a plurality of sub-carriers every symbol; a distortion evaluation circuit configured to evaluate a distortion using each of the sub-carriers of the OFDM signal, and generate channel distortion information; a distortion compensation circuit to subject the sub-carriers to distortion compensation according to a control signal and to generate a plurality of distortion-compensated sub-carriers; a demodulation circuit configured to demodulate the distortion-compensated sub-carriers; a phase distortion estimation circuit configured to generate first phase distortion information indicating a phase distortion of each sub-carrier every symbol, using the distortion-compensated sub-carrier and the channel distortion information; a weighting synthesis circuit configured to generate a plurality of second phase distortion information corresponding to a plurality of weighting factors by weighting the first phase distortion information using the weighting factors of a time function over a plurality of symbol intervals; and a control signal generation circuit configured to generate the control signal using the channel distortion information and the second phase distortion information in order to weight the sub-carriers by the weighting factors individually. - View Dependent Claims (18, 19)
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Specification