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Hybrid analog/digital precoding is a promising technique to reduce the hardware cost of radio-frequency components compared with the conventional full-digital precoding approach in millimeter-wave multiple-input multiple output systems. However, the large antenna dimensions of the hybrid precoder design makes it difficult to acquire an optimal full-digital precoder. Moreover, it also requires matrix...
We consider the channel estimation for millimeter-wave (mmWave) cellular systems in this paper. Because of the limitation of the hybrid RF/digital beamforming and the adoption of large-scale antennas, the acquisition of channel state information (CSI) is challenging. By exploiting the joint spatially sparse nature of practical mmWave channels, we develop a novel channel estimation algorithm based...
Millimeter-wave (mmWave) multiple input multiple output (MIMO) is a key technology for next-generation mobile communication. To overcome mmWave's instinctive channel limitations like serious path attenuation, beamforming is essential for communication systems. In this paper, we proposed a low-complexity hybrid codebook design algorithm for mmWave MIMO motivated by Lloyd algorithm with orthogonal mapping...
The millimeter wave (mmWave) multiple-input multiple-output is a promising technique for next-generation (5G) communication systems. The inherently high path loss in mmWave can be compensated by adopting large antenna array. However, huge cost of radio frequency (RF) chains at high frequencies, as well as large number of antennas, makes full-digital precoding in mmWave-MIMO system infeasible. Hence,...
Millimeter wave (mmWave) communication system provides large unlicensed spectrum which helps to achieve huge capacity leap in the next-generation wireless system. The capacity is further improved by precoding technique in multiple-input-multiple-output (MIMO) transmission systems. Although the adoption of large antenna arrays in mmWave transceivers mitigates the huge path loss, it also increases hardware...
In this paper, we present the implementation of a multi-mode crypto-coprocessor, which can support three different public-key cryptography (PKC) engines (NTRU, TTS, Pairing) used in post-quantum and identity-based cryptosystems. The PKC-based security protocols are more energy-efficient because they usually require less communication overhead than symmetric-key-based counterparts. In this work, we...
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