The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2010
Filed:
Aug. 18, 2003
Gregory C. Copeland, Plano, TX (US);
Gregory C. Copeland, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A wireless base station () for transmitting spread spectrum signals is disclosed. The base station () includes a peak compression unit (), which is comprised of a sequence of peak detection and cancellation circuits (). Each peak detection and cancellation circuit () detects and compresses identified peaks. The further stages of peak detection and cancellation circuits () serve to reduce peaks that, as a result of 'peak regrowth', are caused at sample points near to a reduced peak point. According to one disclosed embodiment, a peak sample point is not qualified for compression unless a number of sample points subsequent to the peak all have lower magnitude than that of the peak. The cancellation pulses applied by the peak detection and cancellation circuits () may be generated by a finite impulse response (FIR) filter pulse, or alternatively by a minimum phase infinite impulse response (IIR) pulse. The peak compression unit () identifies and compresses statistical peaks in the digital symbol amplitude, so that the dynamic range requirements of the power amplifier () in the base station () may be relaxed.