Method and Apparatus for Deciding a Channel Impulse Response
First Claim
1. A method for deciding a channel impulse response, being adapted to an orthogonal frequency division multiplexing (OFDM) system, the method comprising the steps of:
- (a) generating a first channel frequency response of a signal by using a plurality of pilot tones of the signal;
(b) generating a first channel impulse response by applying the inverse fast Fourier transform (IFFT) to the first channel frequency response;
(c) deriving a plurality of first selected channel taps by comparing a plurality of first channel taps related to the first channel impulse response with a first reference threshold; and
(d) generating the channel impulse response by using the first selected channel taps to calculate channel impulse.
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Abstract
Method and apparatus for deciding a channel impulse response for an OFDM system are provided. First, a channel frequency response is generated by using a plurality of pilot tones of a signal. A channel impulse response is generated by applying the IFFT to the channel frequency response. A plurality of selected channel taps are derived by comparing a plurality of channel taps related to the channel impulse response with a reference threshold. Finally, the channel impulse response is generated by calculating channel impulse respose according to the selected channel taps. This method calculates the channel impulse response in time domain and frequency domain so that the calculation complexity can be reduced, and the system efficiency can be enhanced.
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Citations
28 Claims
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1. A method for deciding a channel impulse response, being adapted to an orthogonal frequency division multiplexing (OFDM) system, the method comprising the steps of:
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(a) generating a first channel frequency response of a signal by using a plurality of pilot tones of the signal; (b) generating a first channel impulse response by applying the inverse fast Fourier transform (IFFT) to the first channel frequency response; (c) deriving a plurality of first selected channel taps by comparing a plurality of first channel taps related to the first channel impulse response with a first reference threshold; and (d) generating the channel impulse response by using the first selected channel taps to calculate channel impulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for deciding a channel impulse response, being adapted to an OFDM system, the apparatus comprising:
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a first channel frequency response generator, configured for generating a first channel frequency response of a signal by using a plurality of pilot tones of the signal; an inverse fast Fourier transformer, configured for generating a first channel impulse response by applying the IFFT to the first channel frequency response; a comparator, configured for deriving a plurality of first selected channel taps by comparing a plurality of first channel taps related to the first channel impulse response with a first reference threshold; and a channel impulse response calculator, configured for generating the channel impulse response by using the first selected channel taps to calculate channel impulse. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification