Title :
Receiver design and performance evaluation with ENCAP-4N digital modulation
Author :
Gusmão, António ; Esteves, Nelson
Author_Institution :
Centro de Analise e Processamento de Sinais, Inst. Superior Tecnico, Lisbon, Portugal
Abstract :
The authors examine the coherent detection of ENCoded-Amplitude-and-Phase (ENCAP) offset quadrature phase shift keying (OQPSK) signals with the help of both QPSK-type (MSK-type) receivers and Viterbi receivers. Numerical results are presented on the performance of parallel and serial OQPSK-type receivers as well as matched and mismatched Viterbi receivers. In some cases where compact spectra are obtained, it turns out that the OQPSK-type receivers are nearly as efficient as the optimal Viterbi receivers, even though the former are much simpler. As for sensitivity to synchronization errors, the Viterbi receivers, even if perfectly matched, are not clearly superior to the OQPSK-type receivers
Keywords :
demodulation; phase shift keying; signal detection; ENCAP-4N digital modulation; Viterbi receivers; coherent detection; compact spectra; offset quadrature phase shift keying; signal detection; synchronization errors; Decoding; Demodulation; Digital modulation; Encoding; Error probability; Gas detectors; Hydrogen; Matched filters; Nonlinear filters; Viterbi algorithm;
Conference_Titel :
Electrotechnical Conference, 1989. Proceedings. 'Integrating Research, Industry and Education in Energy and Communication Engineering', MELECON '89., Mediterranean
Conference_Location :
Lisbon
DOI :
10.1109/MELCON.1989.50078
