United States Patent 7,551,663
Proctor, Jr. June 23, 2009
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Use of correlation combination to achieve channel detection
Abstract
Combinations of correlation results are used to achieve detection of multiple coded signals at a receiver in a wireless communications system. The code applied to signals includes a lower rate code and a higher rate code. The lower rate code is a nested or tiered code such that it comprises at least two code sequences of the higher rate code. The received coded signal is correlated with the higher rate code using a single higher rate correlator to provide a higher rate code correlation result. The higher rate code correlation results are fed to two or more lower rate code correlators that combine multiple higher rate code correlation results, each using a different lower rate code, to provide corresponding lower rate code correlation results. The presence of at least one coded signal or mutually exclusive coded signals can be determined from the lower rate code correlation results.
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Inventors: Proctor, Jr.; James A. (Melbourne Beach, FL)
Assignee: IPR Licensing, Inc. (Wilmington, DE)
Appl. No.: 10/119,522
Filed: April 9, 2002
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
09775305 Feb., 2001
60282936 Apr., 2001
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Current U.S. Class: 375/147 ; 375/130; 375/140; 375/150; 375/152
Current International Class: H04B 1/00 (20060101)
Field of Search: 375/130,140,147,150,152
