Spectrally efficient transform domain communication system with quadrature cyclic code shift keying
Authors: 
Su Hu, Guoan Bi, Yong Liang Guan, Shaoqian LiAuthors Info & Claims
Abstract
Transform domain communication system (TDCS), as an overlay cognitive radio communication system, has been proposed to obtain a low probability of interception by using spectrum bin nulling to synthesise an adaptive waveform corresponding to the spectrum sensing output. However, its low spectral efficiency limits potential practical applications. In this study, an efficient modulation scheme, namely quadrature cyclic code shift keying (Q‐CCSK), is proposed for TDCSs by generating another fundamental modulation waveform as the data‐bearing quadrature branch. Although using Q‐CCSK doubles the spectral efficiency for TDCSs, the instinct inter‐branch interference arises from the added quadrature branch. Through the orthogonality analysis, it is proven that the two branches (in‐phase and quadrature‐ branches) are still satisfied the property of quasi‐orthogonality. Moreover, the performances of TDCSs employing Q‐CCSK in additive white Gaussian noise (AWGN) and multipath fading channels are discussed, respectively. Analytical and simulation results demonstrate that, compared with conventional schemes, the TDCS employing Q‐CCSK can double the spectral efficiency with comparable systematic performance.
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© 2021 The Institution of Engineering and Technology.
Publisher
John Wiley & Sons, Inc.
United States
Publication History
Published: 01 March 2013
Author Tags
Author Tags
- spectrally efficient transform domain communication system
- quadrature cyclic code shift keying
- overlay cognitive radio communication system
- spectrum bin nulling
- adaptive waveform
- spectrum sensing output
- spectral efficiency
- efficient modulation scheme
- fundamental modulation waveform
- data‐bearing quadrature branch
- inter‐branch interference
- orthogonality analysis
- AWGN channels
- multipath fading channels
Author Tags
Author Tags
- spectrally efficient transform domain communication system
- quadrature cyclic code shift keying
- overlay cognitive radio communication system
- spectrum bin nulling
- adaptive waveform
- spectrum sensing output
- spectral efficiency
- efficient modulation scheme
- fundamental modulation waveform
- data‐bearing quadrature branch
- inter‐branch interference
- orthogonality analysis
- AWGN channels
- multipath fading channels
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