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:
Nov. 09, 1982
Filed:
Jan. 22, 1981
Shahid U Qureshi, Natick, MA (US);
Codex Corporation, Mansfield, MA (US);
Abstract
A data modulator for transmitting a first sequence of data symbols at a symbol rate of 1/T, the modulator being characterized as having a carrier frequency of f.sub.c Hz and the data symbols being denoted as x(kT), where x(kT) is a real or complex number and k is the time index of the kth symbol, featuring, in one aspect, modulated signal generating means for receiving the first sequence and generating, in response thereto and at the symbol rate, a second sequence of complex-valued signals y(kT), the signal y(kT) representing the complex number y(kT)=x(kT).multidot.exp (j2.pi.f.sub.c kT), where j=.sqroot.-1, and filter means for receiving the second sequence and generating, in response thereto, a third sequence of real-valued signals, at a rate higher than the symbol rate, the third sequence representing linear combinations of the real and imaginary parts of the second sequence of complex-valued signals y(kT).