United States Patent 7,519,103
Kaewell April 14, 2009
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Pre-phase error correction transmitter
Abstract
A CDMA communication system includes a signal processor which encodes voice and nonvoice signals into data at various rates, e.g. data rates of 8 kbps, 16 kbps, 32 kbps, or 64 kbps as I and Q signals. The signal processor selects a specific data rate depending upon the type of signal, or in response to a set data rate. When the signal is received and demodulated, the baseband signal is at the chip level. Both the I and Q components of the signal are despread using the conjugate of the pn sequence used during spreading, returning the signal to the symbol level. Carrier offset correction is performed at the symbol level. A lower overall processing speed is therefore required.
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Inventors: Kaewell; John D. (Jamison, PA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/022,722
Filed: December 27, 2004
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
10744821 Dec., 2003 6850556
10077634 Feb., 2002 6690711
09820014 Mar., 2001 6831941
60192670 Mar., 2000
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Current U.S. Class: 375/141
Current International Class: H04B 1/69 (20060101)
Field of Search: 375/141,130,147,150,296,326 455/24,69 370/342,325,335
