System and method for receiving OFDM signal
First Claim
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1. A system for receiving an OFDM signal, comprising:
- an AD converter configured to sample a received signal at a first sampling rate;
a low pass filter configured to remove selected noise from a signal outputted from said AD converter;
a rate converter configured to extract data from a signal outputted from said low pass filter at a second sampling rate;
an OFDM signal decoding circuit configured to convert and decode a signal outputted from said rate converter from a time domain to a frequency domain; and
an error correction circuit configured to correct errors of a signal outputted from said OFDM signal decoding circuit,wherein said low pass filter is a filter capable of varying a frequency characteristic in response to said first sampling rate.
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Abstract
A system for receiving an OFDM signal. An AD converter samples a received signal at a first sampling rate. A low pass filter removes noise from a signal outputted from the AD converter. A rate converter extracts data from a signal outputted from the low pass filter at a second sampling rate. An OFDM signal decoding circuit converts and decodes a signal outputted from the rate converter from a time domain to a frequency domain. An error correction circuit corrects errors of a signal outputted from the OFDM signal decoding circuit. The low pass filter varies its frequency characteristic in response to said first sampling rate.
59 Citations
23 Claims
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1. A system for receiving an OFDM signal, comprising:
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an AD converter configured to sample a received signal at a first sampling rate; a low pass filter configured to remove selected noise from a signal outputted from said AD converter; a rate converter configured to extract data from a signal outputted from said low pass filter at a second sampling rate; an OFDM signal decoding circuit configured to convert and decode a signal outputted from said rate converter from a time domain to a frequency domain; and an error correction circuit configured to correct errors of a signal outputted from said OFDM signal decoding circuit, wherein said low pass filter is a filter capable of varying a frequency characteristic in response to said first sampling rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for receiving an OFDM signal, comprising:
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an AD converter configured to sample a received signal at a first sampling rate; a low pass filter configured to remove selected noise from a signal outputted from said AD converter; a rate converter configured to extract data from a signal outputted from said low pass filter at a second sampling rate; an OFDM signal decoding circuit configured to convert and decode a signal outputted from said rate converter from a time domain to a frequency domain; an error correction circuit configured to correct errors of a signal outputted from said OFDM signal decoding circuit; and a modulation system detecting circuit configured to detect a modulation system of said received signal, wherein an operational unit of said AD converter changes the number of sampling bits in response to the modulation system detected in said modulation system detecting circuit. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for receiving an OFDM signal, comprising:
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sampling a received signal at a first sampling rate; removing selected noise from said signal sampled at said first sampling rate; extracting data form said signal removed at a second sampling rate; converting and decoding said signal extracted from a time domain to a frequency domain; and correcting an error of said signal decoded, wherein a frequency characteristic in said removing is variable in response to said first sampling rate.
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23. A method for receiving an OFDM signal, comprising:
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sampling a received signal at a first sampling rate; removing selected noise from said signal sampled at said first sampling rate; extracting data from said signal removed at a second sampling rate; converting and decoding said signal extracted from a time domain to a frequency domain; correcting an error of said signal decoding; and
,detecting a modulation system of said received signal, wherein the number of sampling bits in said sampling is changed in response to said detected modulation system.
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Specification