United States Patent 7,773,681
Koo , et al. August 10, 2010
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Method and apparatus for estimating signal-to-noise ratio, noise power, and signal power
Abstract
In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.
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Inventors: Koo; Chang-Soo (Melville, NY), Voltz; Peter J. (Commack, NY), Lu; I-Tai (Dix Hills, NY), Dai; Qingyuan (Germantown, MD), Olesen; Robert L. (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/461,658
Filed: August 1, 2006
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60705915 Aug., 2005
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Current U.S. Class: 375/260 ; 324/614; 348/193; 375/227; 381/94.7
Current International Class: H04K 1/10 (20060101)
Field of Search: 370/206 375/227,267
