Channel estimation method and apparatus using fast fourier transforms
First Claim
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1. A method of performing channel estimation, the method comprising:
- receiving a time domain signal sequence r and a midamble sequence m;
multiplying, element-to-element, the sequences m and r by a chirp waveform, the chirp waveform being based on the length of a fast Fourier transform (FFT) and denoting the resulting sequences as mw and rw respectively, generating a chirp sequence v based on the chirp waveform; and
performing channel estimation based on the resulting sequences mw, rw, the chirp waveform and chirp sequence v,wherein the chirp waveform is Wn2/2 for n=0, 1, 2, . . . , P−
1 where P=456 for burst types 1/3 or P=192 for burst type 2, and
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Abstract
A low cost method and system for efficiently implementing channel estimation in a wireless communication system using any desired length of a fast Fourier transform (FFT) independent of burst type or signal structure. The hardware complexity required to perform the channel estimation to process a plurality of different burst types is reduced. Simple tail zero-padding is used when the length of FFT is extended to a desired length for more efficient computation.
21 Citations
4 Claims
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1. A method of performing channel estimation, the method comprising:
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receiving a time domain signal sequence r and a midamble sequence m; multiplying, element-to-element, the sequences m and r by a chirp waveform, the chirp waveform being based on the length of a fast Fourier transform (FFT) and denoting the resulting sequences as mw and rw respectively, generating a chirp sequence v based on the chirp waveform; and performing channel estimation based on the resulting sequences mw, rw, the chirp waveform and chirp sequence v, wherein the chirp waveform is Wn 2 /2 for n=0, 1, 2, . . . , P−
1 where P=456 for burst types 1/3 or P=192 for burst type 2, and
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2. A receiver for performing channel estimation, the receiver comprising:
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a receiving component configured to receive a time domain signal r and a midamble sequence m, a component configured multiply, element-to-element, the sequences m and r by a chirp waveform, the chirp waveform being based on the length of a fast Fourier transform (FFT) and denote the resulting sequences as mw and rw respectively; a generating component configured to generate a chirp sequence v based on the chirp waveform; and a channel estimation component configured to estimate a channel based on the resulting sequences mw, rw, the chirp waveform and chirp sequence v; wherein the chirp waveform is Wn 2 /2 for n=0, 1, 2, . . . , P−
1 where P=456 for burst types 1/3 or P=192 for burst type 2, and
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3. A wireless transmit/receive unit (WTRU) for performing channel estimation, the WTRU comprising:
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a receiving component configured to receive a time domain signal r and a midamble sequence m, a component configured multiply, element-to-element, the sequences m and r by a chirp waveform, the chirp waveform being based on the length of a fast Fourier transform (FFT) and denote the resulting sequences as mw and rw respectively; a generating component configured to generate a chirp sequence v based on the chirp waveform; and a channel estimation component configured to estimate a channel based on the resulting sequences mw, rw, the chirp waveform and chirp sequence v; wherein the chirp waveform is Wn 2 /2 for n=0, 1, 2, . . . , P−
1 where P=456 for burst types 1/3 or P=192 for burst type 2, and
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4. A base station (BS) for performing channel estimation, the BS comprising:
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a receiving component configured to receive a time domain signal r and a midamble sequence m, a component configured multiply, element-to-element, the sequences m and r by a chirp waveform, the chirp waveform being based on the length of a fast Fourier transform (FFT) and denote the resulting sequences as mw and rw respectively; a generating component configured to generate a chirp sequence v based on the chirp waveform; and a channel estimation component configured to estimate a channel based on the resulting sequences mw, rw, the chirp waveform and chirp sequence v; wherein the chirp waveform is Wn 2 /2 for n=0, 1, 2, . . . , P−
1 where P=456 for burst types 1/3 or P=192 for burst type 2, and
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Specification
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Current AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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Original AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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InventorsZeira, Ariela, Pan, Jung-Lin, Haim, John W.
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Primary Examiner(s)Pathak; Sudhanshu C
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Application NumberUS10/618,227Publication NumberTime in Patent Office2,363 DaysField of Search375/260, 375/347, 375/130, 375/340, 375/222, 370/210, 370/203, 711/5US Class Current375/139CPC Class CodesH04B 2001/6912 using chirpH04L 25/0232 by interpolation between so...H04L 27/103 Chirp modulation for spread...H04L 27/2647 Arrangements specific to th...
