United States Patent 7,769,075
Hosseinian , et al. August 3, 2010
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Method and apparatus for channel estimation using time-frequency localized pilots and de-noising techniques
Abstract
A method and apparatus for performing channel estimation using time-frequency localized pilots and de-noising techniques are disclosed. A transmitter sends pilot symbols which are localized in a joint time-frequency domain to a receiver for channel estimation. The receiver receives the pilot symbols and performs a time-frequency analysis, such as a discrete Gabor transform (DGT), to transform the received pilot symbols to a joint time-frequency domain. The receiver applies a de-noising technique, such as masking, to separate the pilot symbols from the embedded noise in the joint time-frequency domain. The receiver performs a time-frequency synthesis, such as an inverse discrete Gabor transform (IDGT), to generate a noise-removed pilot symbols in a time domain. The noise left after de-noising is only that part that overlaps with the pilot symbols in the joint time-frequency domain. The receiver then performs channel estimation with the noise-removed pilot symbols.
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Inventors: Hosseinian; Seyed M. (Commack, NY), Bultan; Aykut (Bayside, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/687,345
Filed: March 16, 2007
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60783221 Mar., 2006
60783641 Mar., 2006
60783642 Mar., 2006
60783607 Mar., 2006
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Current U.S. Class: 375/140 ; 375/316; 375/346
Current International Class: H04B 1/00 (20060101)
Field of Search: 375/140,316,346
