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:
Jun. 09, 1998
Filed:
Jun. 04, 1996
Scott David Blanchard, Mesa, AZ (US);
Kenneth Solomon Wreschner, Chandler, AZ (US);
Marc David Brack, Chandler, AZ (US);
Terry Winningham, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An asynchronous communications receiver rapidly despreads and demodulating a short, low duty cycle CDMA burst signal. The receiver includes a multichannel despreader (20) for generating a plurality of despread signals (21) corresponding to timing offsets of a spreading code. The plurality of despread signals are respectively supplied to a plurality of demodulators (22) for demodulating each despread signal and for respectively generating a plurality of soft decisions for each demodulated bit values whereby each soft decision is proportional to the quality of the received signal. The plurality of soft decisions are supplied to both a first input of a plurality of multipliers (23) and to a plurality of inputs of a selector (28). The selector processes the soft decisions from each of the demodulators and generates a message indicator (29) when a message is present. The selector also generates a plurality of weights (W1-WN) corresponding to each of the plurality of soft decisions and applies these weights to a second input of the plurality of multipliers. The multipliers multiply the soft decision by its respective weight as supplied from the selector to generate output scaled signals. Finally, a combiner (30) sums the scaled signals to provide an output bit value for applying to a message extractor (32) which generates the actual received digital message.