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China claims terahertz triumph in detecting submarines

Chinese scientists have successfully tested the world's first submarine-detecting device based on next-generation 6G communication technology. ....

Yellow Sea , Oceans General , Chinese Military , Ocean Waves , 0 Nanometer , Stealth Communication , Unmanned Drone , Noise Emitted ,

"Low-Rank Matrix Sensing-Based Channel Estimation for mmWave and THz Hy" by Khawaja Fahad Masood, Jun Tong et al.

This paper studies the channel estimation for wideband multiple-input multiple-output (MIMO) systems equipped with hybrid analog/digital transceivers operating in the millimeter-wave (mmWave) or terahertz (THz) bands. By exploiting the low-rank property of the concatenated channel matrix of the delay taps, we formulate the channel estimation problem as a low-rank matrix sensing (LRMS) problem and solve it using a low-complexity generalized conditional gradient-alternating minimization (GCG-ALTMIN) algorithm. This LRMS-based solution can accommodate different precoder/combiner and training structures. In addition, it does not require knowledge about the array responses at the transceivers, in contrast to most existing solutions allowing low training overhead. Furthermore, a preconditioned conjugate gradient (PCG) algorithm-based implementation and a low-rank matrix completion (LRMC) formulation are proposed to further reduce the computational complexity. In order to enhance the channel ....

Channel Estimation , Channel Estimation , Ybrid Mimo , Ow Rank Matrix Sensing , Atching Pursuit Algorithms , Millimeter Wave , Illimeter Wave Communication , Imo Communication ,

Compact, Single-Mode THz QCLs Get Boost from BICs | Research & Technology | Jun 2023

A team at Nanyang Technological University (NTU) developed an electrically pumped, topological, bulk quantum cascade laser (QCL) that operates in the ....

Nanyang Technological University , Research Amp Technology , Asia Pacific , Quantum Cascade Lasers , Light Sources ,