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:
Sep. 04, 2012
Filed:
Feb. 10, 2009
Partha Sarathy Murali, San Jose, CA (US);
Kashiviswanath Nethi, Medak, IN;
Karthik Vaidyanathan, San Jose, CA (US);
Sundaram Vanka, Notre Dame, IN (US);
Partha Sarathy Murali, San Jose, CA (US);
Kashiviswanath Nethi, Medak, IN;
Karthik Vaidyanathan, San Jose, CA (US);
Sundaram Vanka, Notre Dame, IN (US);
Redpine Signals, Inc., San Jose, CA (US);
Abstract
A channel smoothing filter with a finite impulse response (FIR) has a controller which reads parallel sample data out of an FFT memory in such a manner as to generate an even function, the sample data applied to a preamble equalizer accompanied by a preamble sign and zero, the preamble outputs coupled to three filter processors, each filter processor having four filter engines whose outputs are summed, the channel smoothing filter generating an a register output, the register input coupled to a summer which has as inputs: the first filter processor shifted by four, the second filter processor shifted by two, the third filter processor, and the register output. Coefficients for an edge filter and a central filter are provided in Zero Sign Shift (ZSS) format, and by selection of coefficients using a canonical signed digit (CSD) algorithm, no multipliers are required for the channel smoothing FIR filter.