United States Patent 7,865,158
Bultan , et al. January 4, 2011
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Method and apparatus for automatically correcting receiver oscillator frequency
Abstract
A method and apparatus for automatically correcting the frequency of a local oscillator of a receiver. A primary common pilot channel (CPICH) code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signal. The received despread CPICH code sequence is used to generate an estimated frequency error signal. A control voltage signal is generated by a control voltage generator based on the estimated frequency error signal. The CPICH code generator generates the CPICH code sequence based on signals received from a high speed downlink packet access (HSDPA) serving cell when HSDPA is active, or a timing reference cell when HSDPA is not active. The present invention achieves full maximum ratio combining gain when space time transmit diversity (STTD) is used, even without receiving a transmit diversity indication.
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Inventors: Bultan; Aykut (Bayside, NY), Pan; Jung-Lin (Selden, NY), Yang; Rui (Greenlawn, NY), Kearney; Kenneth P. (Smithtown, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/299,502
Filed: December 12, 2005
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60702667 Jul., 2005
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Current U.S. Class: 455/192.2 ; 375/344; 455/254; 455/257; 455/264; 455/265
Current International Class: H04B 1/18 (20060101)
Field of Search: 455/192.1-192.3,254-266 375/327,344
PPP
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