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. 20, 1999
Filed:
Mar. 06, 1997
Keh-Shehn Lu, San Diego, CA (US);
Uniden San Diego Research and Development Center, Inc., San Diego, CA (US);
Abstract
A method for setting a bit determination threshold for determining the logic state of a bit in a data bit stream of an NRZ (non-return-to-zero) signal in a GMSK (gaussian minimum shift keying) communication system includes the step of sensing the occurrence of a 'flat top' bit in the data bit stream, which signifies the occurrence of a first string of successive same state bits in the data bit stream, where the bits are in a first logic state, such as logic 1. The average bit amplitude of the information signal corresponding to the 'flat top' bit of the first string is determined. The occurrence of a second 'flat top' bit in the data bit stream which signifies the occurrence of a second string of successive same state bits which are of an opposite logic state, such as logic 0, is then sensed, and the average bit amplitude of the second 'flat top' bit of the second string is determined. The average bit amplitude of the first 'flat top' bit of the first string is averaged with the average bit amplitude of the second 'flat top' bit of the second string to determine a threshold level which is used in setting a bit determination threshold. A circuit for carrying out this method may be in the form of a programmable DSP (digital signal processor).