Title :
Half-Symbol-Rate-Carrier Offset QPSK Transmitter for Bandwidth-Efficient High-Speed Data Communications
Author :
Yeo, Hyeopgoo ; Lee, Younghun ; Chen, Jinghong ; Lin, Jenshan
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL
fDate :
6/1/2007 12:00:00 AM
Abstract :
This letter proposes a half-symbol-rate-carrier (HSRC) offset quadrature phase shift keying (OQPSK) modulation for high-speed data communications. A prototype transmitter generating the HSRC-OQPSK signal was designed and built. Measurement results confirm the theory that the proposed HSRC-OQPSK modulation improves spectral efficiency by reducing the second lobe of the signal spectrum by 10 dB. Furthermore, HSRC-OQPSK modulation reduces the first null bandwidth by 25% compared to standard non-return-to-zero (NRZ) modulation. Like NRZ, HSRC-OQPSK uses two-level data decision which enables a simpler transceiver architecture than multilevel pulse amplitude modulations (PAMs), such as 4-PAM and duobinary
Keywords :
data communication; quadrature phase shift keying; radio transmitters; transceivers; HSRC-OQPSK signal; bandwidth-efficient high-speed data communications; half-symbol-rate-carrier offset QPSK transmitter; multilevel pulse amplitude modulations; quadrature phase shift keying modulation; signal spectrum; transceiver architecture; two-level data decision; Bandwidth; Data communication; Optical signal processing; Phase modulation; Prototypes; Quadrature phase shift keying; Signal design; Signal generators; Transceivers; Transmitters; Bandwidth efficiency; half-symbol-rate-carrier (HSRC); high-speed data communications; phase-shift-keying (PSK);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.897852
