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. 17, 2001
Filed:
Jul. 14, 1998
Applicant:
Inventors:
Assignee:
Electronics and Telecommunications Research Institute, Daejon-Shi, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 2/730 ; H04L 5/16 ; H04L 2/722 ; H04B 7/216 ;
U.S. Cl.
CPC ...
H04L 2/730 ; H04L 5/16 ; H04L 2/722 ; H04B 7/216 ;
Abstract
The present invention proposes a structure of a coherent dual-channel QPSK transceiver using pilot symbols in a code division multiple access system, which can reduce the variation width of the entire transmission signal by putting pilot symbols into data bit streams, can remove a crosstalk by separating input information bits into two channels and then allocating different quadrature codes to respective channels, and can also improve the error performance of the entire system by preventing changes in phases of the transmission carrier and reducing the degree of the envelope variation of the entire signals.