Half-Symbol-Rate-Carrier Offset QPSK Transmitter for Bandwidth-Efficient High-Speed Data Communications

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 modu...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2007-06, Vol.17 (6), p.466-468
Main Authors: Yeo, Hyeopgoo, Lee, Younghun, Chen, Jinghong, Lin, Jenshan
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Bandwidth efficiency
Data communication
Exact sciences and technology
half-symbol-rate-carrier (HSRC)
High speed
high-speed data communications
Microwaves
Modulation
Multilevel
Noise levels
Offsets
Optical signal processing
Phase modulation
phase-shift-keying (PSK)
Prototypes
Quadrature phase shift keying
Radiocommunications
Signal design
Signal generators
Spectra
Telecommunications
Telecommunications and information theory
Transceivers
Transmitters
Transmitters. Receivers
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Summary: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
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2007.897852