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:
Jan. 24, 1995
Filed:
Sep. 28, 1992
Andrew Elms, Reading, GB;
Technophone Limited, Camberly, GB;
Abstract
A method of receiving digitized data encoded to permit forward error correction, for example convolutionally encoded data transmitted in a burst-mode radio communication system such as GSM. Prior to transmission a set of first data elements (bits) relating to a first message which may be associated with a first channel type (e.g. a traffic channel (TCH) in GSM) has selected bits substituted or stolen by data elements (bits) relating to a second message which may be associated with a second channel type (e.g. a fast associated channel (FACCH) in GSM). At the receiver the second message is recovered by extracting the substitute data elements. In order to improve bit error rate performance the received data is then modified by replacing the substitute data elements with low-or zero-valued 'soft decisions', i.e. further data elements comprising respective components indicative of the low level of confidence associated therewith relative to the original data element. The modified data is decoded using, for example a Viterbi decoder (4) sensitive to the soft decisions to estimate the most likely set of data elements comprising the first message.