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pro vyhledávání: '"Ratnam, A. V."'
Autor:
Ratnam, Vishnu V., Sadiq, Bilal, Chen, Hao, Sun, Wei, Wu, Shunyao, Ng, Boon L., Jianzhong, Zhang
Although Wi-Fi is an ideal technology for many ranging applications, the performance of current methods is limited by the system bandwidth, leading to low accuracy of $\sim 1$ m. For many applications, measuring differential range, viz., the change i
Externí odkaz:
http://arxiv.org/abs/2405.12168
Autor:
Ratnam, Vishnu V., Mo, Jianhua, AlAmmouri, Ahmad, Ng, Boon L., Jianzhong, Zhang, Molisch, Andreas F.
Publikováno v:
IEEE Access, vol. 10, pp. 73364-73377, 2022
Hybrid beamforming is an attractive solution to build cost-effective and energy-efficient transceivers for millimeter-wave and terahertz systems. However, conventional hybrid beamforming techniques rely on analog components that generate a frequency
Externí odkaz:
http://arxiv.org/abs/2312.11682
Publikováno v:
IEEE Transactions on Wireless Communications (2024)
Due to its ubiquitous and contact-free nature, the use of WiFi infrastructure for performing sensing tasks has tremendous potential. However, the channel state information (CSI) measured by a WiFi receiver suffers from errors in both its gain and pha
Externí odkaz:
http://arxiv.org/abs/2307.12126
Autor:
Ratnam, Vishnu V.
Millimeter-wave and Terahertz frequencies, while promising high throughput and abundant spectrum, are highly susceptible to hardware non-idealities like phase-noise, which degrade the system performance and make transceiver implementation difficult.
Externí odkaz:
http://arxiv.org/abs/1909.04259
Autor:
Ratnam, Vishnu V., Molisch, Andreas F.
Analog beamforming greatly reduces the implementation cost of massive antenna transceivers by using only one up/down-conversion chain. However, it incurs a large pilot overhead when used with conventional channel estimation (CE) techniques. This is b
Externí odkaz:
http://arxiv.org/abs/1901.08763
Autor:
Ratnam, Vishnu V., Molisch, Andreas F.
Analog beamforming is an attractive and cost-effective solution to exploit the benefits of massive multiple-input-multiple-output systems, by requiring only one up/down-conversion chain. However, the presence of only one chain imposes a significant o
Externí odkaz:
http://arxiv.org/abs/1901.04078
Autor:
Ratnam, J. V.1 (AUTHOR) jvratnam@jamstec.go.jp, Behera, Swadhin K.1 (AUTHOR), Nonaka, Masami1 (AUTHOR), Martineau, Patrick1 (AUTHOR), Patil, Kalpesh R.1 (AUTHOR)
Publikováno v:
Scientific Reports. 11/20/2023, Vol. 13 Issue 1, p1-14. 14p.
This work studies a variant of hybrid beamforming, namely, hybrid beamforming with selection (HBwS), as an attractive solution to reduce the hardware cost of multi-user Massive Multiple-Input-Multiple-Output systems, while retaining good performance.
Externí odkaz:
http://arxiv.org/abs/1708.00083
Akademický článek
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Autor:
Molisch, Andreas F., Ratnam, Vishnu V., Han, Shengqian, Li, Zheda, Nguyen, Sinh Le Hong, Li, Linsheng, Haneda, Katsuyuki
Hybrid multiple-antenna transceivers, which combine large-dimensional analog pre/postprocessing with lower-dimensional digital processing, are the most promising approach for reducing the hardware cost and training overhead in massive MIMO systems. T
Externí odkaz:
http://arxiv.org/abs/1609.05078