Nonlinear Communication System with Harmonic Diversity
Cheong P.2; Wu K.1; Tam K.-W.2
Source PublicationIEEE Transactions on Microwave Theory and Techniques

This paper presents the concept and demonstration of harmonic diversity for wireless communication, which makes use of multiple harmonic radio frequency (RF) channels with respect to the carrier frequency. Rather than frequency and space diversities widely used today to improve multipath fading, signal quality and spectral efficiency, the proposed scheme does not require multiple RF transceiver front-ends. The advantages of inherent RF device nonlinear characteristics are harnessed to produce and process harmonics within single transceiver. Even though distinct harmonic channels will exhibit different order of phase shifts, the analysis shows that such phase offsets can be compensated by adjusting the phase of local oscillator (LO) at receiver end. Extending the framework of the Shannon theorem, an M-channel harmonic communication system is shown to reduce the minimum required signal-to-noise ratio (SNR) at the input of receiver by M-times. In addition, this work indicates that the power consumption of transmitter can be significantly reduced up to 66% than the conventional ones. Through the analysis of channel capacity, the harmonic system is proved to outperform the single channel counterpart especially when SNR is low. To validate the correctness of the proposed concept, a series of experiments are carried out to emulate the developed theoretical models. For instance, a three-channel harmonic communication system is prototyped, involving certain RF harmonic components designed for demonstration. The retrieved signal strengths are examined with different phase setting of receiving LO, and various modulation techniques are applied for estimating the system performances. All measured results are in agreement with their simulated counterparts, thereby demonstrating the correctness and usefulness of the proposed theories and techniques for nonlinear communication systems of harmonic diversity.

KeywordHarmonic Diversity Intermodulation Nonlinear Communication System Nonlinearity Phase Correlation Power Consumption Signal-to-noise Ratio
URLView the original
Indexed BySCI
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000366318000030
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Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Affiliation1.Poly-Grames Research Center
2.Universidade de Macau
Recommended Citation
GB/T 7714
Cheong P.,Wu K.,Tam K.-W.. Nonlinear Communication System with Harmonic Diversity[J]. IEEE Transactions on Microwave Theory and Techniques,2015,63(12):4130-4149.
APA Cheong P.,Wu K.,&Tam K.-W..(2015).Nonlinear Communication System with Harmonic Diversity.IEEE Transactions on Microwave Theory and Techniques,63(12),4130-4149.
MLA Cheong P.,et al."Nonlinear Communication System with Harmonic Diversity".IEEE Transactions on Microwave Theory and Techniques 63.12(2015):4130-4149.
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