Method and device for resisting DC interference of an OFDM system
First Claim
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1. A method for resisting DC interference of an OFDM system comprising at least the steps of:
- receiving an OFDM signal by using an RF module;
demodulating said OFDM signal by using a demodulation circuit;
introducing in a weighting look-up table;
giving different weight to interfered sub-carriers according to a modulation type and a frequency offset by looking up said weighting look-up table; and
decoding out signals with weighting effect.
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Abstract
A method and device for resisting DC interference of an orthogonal frequency division multiplexing (OFDM) system are used to obtain interference of a DC source to an OFDM system corresponding to various modulation types and frequency offsets for producing a weighting look-up table when the OFDM makes simulation. Different weights are then given to interfered sub-carriers based on this weighting look-up table when decoding. Reliable signals can thus be used to compensate interfered unreliable signals to accomplish the object of resisting DC interference for the OFDM system.
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Citations
10 Claims
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1. A method for resisting DC interference of an OFDM system comprising at
least the steps of: -
receiving an OFDM signal by using an RF module;
demodulating said OFDM signal by using a demodulation circuit;
introducing in a weighting look-up table;
giving different weight to interfered sub-carriers according to a modulation type and a frequency offset by looking up said weighting look-up table; and
decoding out signals with weighting effect. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for resisting DC interference of an OFDM system at least comprising:
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an RF module for receiving an OFDM signal via a communication channel;
a DC interference estimation unit electrically connected with said RF module for receiving a DC source generated by said RF module;
a demodulation circuit electrically connected with said RF module;
a frequency offset estimation unit electrically connected with said demodulation circuit for getting an estimated frequency offset for said DC source and then obtaining a weighting look-up table based on the correspondence between said frequency offset and a modulation type; and
a decoder electrically connected with said demodulation circuit for giving different weights to interfered sub-carriers according to said weighting look-up table and then decoding for output. - View Dependent Claims (9, 10)
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Specification