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:
May. 26, 1998
Filed:
Nov. 02, 1995
Tetsuya Takaki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The invention provides a transmission bit rate discrimination method and apparatus wherein, when a base station in a mobile communication which makes use of spectrum spreading performs transmission at a variable bit rate using four different transmission bit rates and repetitively transmits transmission symbols of a low transmission bit rate, a mobile station detects a rate of repetitions of received symbols and discriminates the transmission bit rate of received data simply. A received symbol sequence for one frame is inputted to shifters for shifting the received symbol sequence by one, three and seven symbol distances, respectively, and a correlation calculator for calculating an auto-correlation. The outputs of the shifters are inputted to correlation calculators for calculating cross-correlations, and results of the correlation calculations are inputted to a comparator, by which they are compared with reference to a result of the auto-correlation calculation to discriminate the transmission bit rate. A switch is switched in response to the discriminated transmission bit rate so that the received symbol sequence is sent out to one of Viterbi decoders which corresponds to the transmission bit rate.