Minimising the costs of next generation aperture synthesis passive millimetre wave imagers

2011 ◽  
Author(s):  
Neil A. Salmon ◽  
Peter N. Wilkinson ◽  
Christopher T. Taylor ◽  
Med Benyezzar
Keyword(s):  
Aperture Synthesis ◽  
Next Generation ◽  
Millimetre Wave

scholarly journals Radio-frequency chain selection for energy and spectral efficiency maximization in hybrid beamforming under hardware imperfections

2020 ◽  
Vol 476 (2244) ◽  
pp. 20200451
Author(s):  
Evangelos Vlachos ◽  
John Thompson ◽  
Aryan Kaushik ◽  
Christos Masouros
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Radio Frequency ◽  
Spectral Efficiency ◽  
Significant Loss ◽  
System Modelling ◽  
Next Generation ◽  
Hardware Complexity ◽  
Millimetre Wave ◽  
Hybrid Beamforming

The next-generation wireless communications require reduced energy consumption, increased data rates and better signal coverage. The millimetre-wave frequency spectrum above 30 GHz can help fulfil the performance requirements of the next-generation mobile broadband systems. Multiple-input multiple-output technology can provide performance gains to help mitigate the increased path loss experienced at millimetre-wave frequencies compared with microwave bands. Emerging hybrid beamforming architectures can reduce the energy consumption and hardware complexity with the use of fewer radio-frequency (RF) chains. Energy efficiency is identified as a key fifth-generation metric and will have a major impact on the hybrid beamforming system design. In terms of transceiver power consumption, deactivating parts of the beamformer structure to reduce power typically leads to significant loss of spectral efficiency. Our aim is to achieve the highest energy efficiency for the millimetre-wave communications system while mitigating the resulting loss in spectral efficiency. To achieve this, we propose an optimal selection framework which activates specific RF chains that amplify the digitally beamformed signals with the analogue beamforming network. Practical precoding is considered by including the effects of user interference, noise and hardware impairments in the system modelling.

First imagery generated by near-field real-time aperture synthesis passive millimetre wave imagers at 94 GHz and 183 GHz

2010 ◽  
Author(s):  
Neil A. Salmon ◽  
Ian Mason ◽  
Peter Wilkinson ◽  
Chris Taylor ◽  
Peter Scicluna
Keyword(s):  
Real Time ◽  
Near Field ◽  
Aperture Synthesis ◽  
Millimetre Wave

Next generation of a sub-millimetre wave security camera utilising superconducting detectors

2013 ◽  
Vol 8 (01) ◽  
pp. P01014-P01014 ◽  
Author(s):  
T May ◽  
E Heinz ◽  
K Peiselt ◽  
G Zieger ◽  
D Born ◽  
...  
Keyword(s):  
Superconducting Detectors ◽  
Next Generation ◽  
Millimetre Wave

scholarly journals Spatial Correlation Based Transmit Antenna Selection Assisted Fully Generalized Spatial Modulation for Peer-to-Peer Communications

2021 ◽  
Author(s):  
Vinoth Babu Kumaravelu ◽  
Gudla Vishnu Vardhan ◽  
Asha S ◽  
Prakasam P ◽  
Arthi Murugadass ◽  
...  
Keyword(s):  
Spatial Correlation ◽  
Mimo Systems ◽  
Antenna Selection ◽  
Peer To Peer ◽  
Spatial Modulation ◽  
Small Cells ◽  
Small Scale ◽  
Next Generation ◽  
Transmit Antenna Selection ◽  
Millimetre Wave

Abstract The next generation technologies like device-to-device ( D2D ) and small cells employ small scale multiple input multiple output ( MIMO ) systems for peer-to-peer ( P2P ) communications. Due to higher spectral and energy efficiencies , spatial modulation (SM) has become one of the dominant next generation technologies. To maximize spectral efficiency and user experience, high rate SM variants like fully generalized spatial modulation ( FGSM ) can be employed for P2P applications. Due to insufficient spacing between antenna elements of devices, access points (AP), millimetre wave ( mmWave ) and sub- THz bands of operations, the performance of SM variants are hindered in P2P scenarios. The average bit error rate ( ABER ) performance of FGSM is severely degraded by atleast 13 dB under spatially correlated channel conditions. To enhance the performance of FGSM , three different transmit antenna selection ( TAS ) schemes are utilized, which eliminate transmit antennas with maximum spatial correlation. First TAS scheme performs antenna selection based on spatial correlation angle alone, whereas other two schemes use channel capacity in addition to spatial correlation angle. Through extensive Monte Carlo simulations, it has been proved that TAS based on spatial correlation ( TAS -SC- FGSM ) scheme offers a performance gain of at least 8 dB over conventional FGSM without antenna selection ( FGSM - NTAS ). TAS -SC- FGSM also outperforms other two hybrid TAS schemes at the cost of higher computational complexity.

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