Improved design for modulator and demodulator in offset-quaternary-phase-key-shifting (OQPSK) communication system enables receiver to resolve ambiguity in estimated phase of received signal. Features include unique-code-word modulation and detection and digital implementation of Costas loop in carrier-recovery subsystem. Enchances performance of carrier-recovery subsystem, reduces complexity of receiver by removing redundant circuits from previous design, and eliminates dependence of timing in receiver upon parallel-to-serial-conversion clock.
Resolving Phase Ambiguities In OQPSK
NASA Tech Briefs ; 15 , 7
1991-07-01
Miscellaneous
No indication
English
Resolving Rotational Ambiguities for Spin-stabilized Satellites
British Library Conference Proceedings | 2008
|A Reduced Complexity OQPSK-Type Detector for SOQPSK
IEEE | 2018
|SOLUTIONS - Electronics-Computers - Multiple-Bit Differential Detection of OQPSK
Online Contents | 2005
A digital Rayleigh fade compensation technique for coherent IJF-OQPSK systems
Automotive engineering | 1990
|IJF-OQPSK modulation schemes with MLSE receivers for portable/mobile communications
Automotive engineering | 1992
|