scholarly journals Mixer-Duplexer-Antenna Leaky-Wave System Based on Periodic Space-Time Modulation

2017 ◽  
Vol 65 (2) ◽  
pp. 442-452 ◽  
Author(s):  
Sajjad Taravati ◽  
Christophe Caloz
Keyword(s):  
Space Time ◽  
Wave System ◽  
Leaky Wave ◽  
Time Modulation ◽  
Periodic Space

Differential Space Time Modulation with Distributed Transmit Antennas

2011 ◽  
Vol 30 (3) ◽  
pp. 759-762
Author(s):  
De-fu Sun ◽  
You-xi Tang ◽  
Shi-hai Shao ◽  
Shao-qian Li
Keyword(s):  
Space Time ◽  
Time Modulation

A Linear Acoustic Phased Array for Nonreciprocal Transmission and Reception

2020 ◽  
Author(s):  
R. Adlakha ◽  
M. Moghaddaszadeh ◽  
M. A. Attarzadeh ◽  
A. Aref ◽  
M. Nouh
Keyword(s):  
Phase Modulation ◽  
Frequency Conversion ◽  
Phased Array ◽  
Space Time ◽  
Mathematical Framework ◽  
Sound Waves ◽  
Asymmetric Transmission ◽  
Time Modulation ◽  
Dynamic Phase ◽  
Phase Angles

Abstract Acoustic phased arrays are capable of steering and focusing a beam of sound via selective coordination of the spatial distribution of phase angles between multiple sound emitters. Here, we propose a controllable acoustic phased array with space-time modulation that breaks time-reversal symmetry, and enables phononic transition in both momentum and energy spaces. By leveraging the dynamic phase modulation, the proposed linear phased array is no longer bound by the reciprocity principle, and supports asymmetric transmission and reception patterns that can be tuned independently. Through theoretical and numerical investigations, we develop and verify a mathematical framework to characterize the nonreciprocal phenomena, and analyze the frequency conversion between the wave fields. The space-time acoustic phased array facilitates unprecedented control over sound waves in a variety of applications including underwater telecommunication.

Raptor-Coded Noncoherent Cooperative Schemes Based on Distributed Unitary Space–Time Modulation

2015 ◽  
Vol 63 (8) ◽  
pp. 2873-2884 ◽  
Author(s):  
Wei-Min Lai ◽  
Yen-Ming Chen ◽  
Yeong-Luh Ueng
Keyword(s):  
Space Time ◽  
Unitary Space ◽  
Time Modulation
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