United States Patent 7,519,098
Schilling April 14, 2009
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Spread spectrum base station notch filtering transmitted signals
Abstract
A base station is in a spread spectrum code division multiple access (CDMA) communication system with co-exists with a diverse system of existing users. The diverse system selectively utilizes various frequencies within a selected range of frequencies. The base station generates a plurality of spread spectrum CDMA data signals using pseudo random chip code sequences. The spread data signals encompass the selected range. The base station notch filters the spread data signals at frequencies within the selected range used by the diverse system. The notch filtered spread data signals are transmitted in CDMA cellular radio communications.
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Inventors: Schilling; Donald L. (Sands Point, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 10/782,165
Filed: February 19, 2004
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
10087643 Feb., 2002 6711145
09846068 Jun., 2002 6407989
09602718 Jun., 2001 6243370
08272498 Sep., 2000 6115368
08015574 Feb., 1993
07700788 Feb., 1993 5185762
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Current U.S. Class: 375/130 ; 370/335; 370/342; 375/140; 375/146
Current International Class: H04B 1/00 (20060101); H04B 7/216 (20060101)
Field of Search: 375/130,140,146 370/342
