Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiunn-Horng ChernfiledCriticalJiunn-Horng Chern
Priority to TW086110268ApriorityCriticalpatent/TW348351B/en
Application grantedgrantedCritical
Publication of TW348351BpublicationCriticalpatent/TW348351B/en
Digital Transmission Methods That Use Modulated Carrier Waves
(AREA)
Abstract
A quadriphase-shift keying (QPSK) modulator, which modulates binary data string signals in a string form into a quadriphase-shift keying (QPSK) signals, and comprises: a serial to parallel data converter for receiving and converting the string type data string signals into parallel first data signals and second data signals; a first press-controlled power source generating a first power data signal under the control of the first data signal; a first oscillator receiving the first power data signal of the first press-controlled power source, and respondingly generating a first binary phase shift keying (BPSK) signal; a differentiator for receiving the second data signal and converting the signal differential into a pulse data string signal; a second press-control power source receiving the pulse data string signal of the differentiator and respondingly generating a second power data signal; a second oscillator for receiving the second power data signal of the second power source and respondingly generating a second BPSK signal; and a mixer.
Phase shift keying modulation including a data converter for converting an input data signal having 3 bits long into two ternary converted data signals