Search

Your search keyword '"Nan, Sha"' showing total 241 results
Start Over Author "Nan, Sha"
241 results on '"Nan, Sha"'

28. SWIPT in mMIMO system with non-linear energy-harvesting terminals: protocol design and performance optimization

Author

Kui Xu, Ming Zhang, Jie Liu, Nan Sha, Wei Xie, and Lihua Chen

Subjects
Massive MIMO, Beam-domain channel representation, Simultaneous wireless information and power transfer, Beamforming, Achievable sum-rate, Telecommunication, TK5101-6720, Electronics, TK7800-8360
Abstract

Abstract In this paper, we design the simultaneous wireless information and power transfer (SWIPT) protocol for massive multi-input multi-output (mMIMO) system with non-linear energy-harvesting (EH) terminals. In this system, the base station (BS) serves a set of uplink fixed half-duplex (HD) terminals with non-linear energy harvester. Considering the non-linearity of practical energy-harvesting circuits, we adopt the realistic non-linear EH model rather than the idealistic linear EH model. The proposed SWIPT protocol can be divided into two phases. The first phase is designed for terminals EH and downlink training. A beam domain energy beamforming method is employed for the wireless power transmission. In the second phase, the BS forms the two-layer receive beamformers for the reception of signals transmitted by terminals. In order to improve the spectral efficiency (SE) of the system, the BS transmit power- and time-switching ratios are optimized. Simulation results show the superiority of the proposed beam-domain SWIPT protocol on SE performance compared with the conventional mMIMO SWIPT protocols.

Published
2019
Full Text
View/download PDF

44. Enhancing Physical Layer Security of Cooperative Nonorthogonal Multiple Access Networks via Artificial Noise

Author

Dan Jiang, Yuanyuan Gao, Guoxin Li, Nan Sha, Xu Bian, and Xiaoyu Wang

Subjects
Computer Networks and Communications, Hardware and Architecture, Control and Systems Engineering, Signal Processing, cooperative nonorthogonal multiple access, physical layer security, artificial noise, security–reliability trade-off, outage probability, intercept probability, Electrical and Electronic Engineering
Abstract

The massive connectivity requirement and security issues have become major factors restricting the further development of the Internet of Things. Nonorthogonal multiple access (NOMA) can be combined with physical layer security (PLS) to achieve massive connectivity and secure transmission. This article investigates the PLS performance for a downlink communication system over Nakagami-m fading channels, with full-duplex (FD) cooperative NOMA transmission aided by artificial noise (AN). While direct communication is built between the base station and two NOMA users, the strong user is employed as an FD relay as well as the jammer to enhance the PLS of the legitimate transmission in the presence of a passive eavesdropper (Eve). Closed-form analytical expressions in terms of the outage probability of the legitimate users and the intercept probability of Eve are derived to evaluate the security–reliability trade-off (SRT) of the proposed scheme. Monte Carlo simulations are provided to validate the veracity of the theoretic analyses and illustrate that the proposed scheme is superior in terms of SRT to the benchmark schemes in the low SNR region. Furthermore, the results reveal that the SRT performance of the two NOMA users can be enhanced through a proper AN-bearing ratio and power allocation optimization.

Published
2023
Full Text
View/download PDF

46. Electroacupuncture relieves visceral hypersensitivity through modulation of the endogenous cannabinoid system.

Author

Ma, Ning, Li, Xiaojing, Li, Qiuhua, Yang, Diqi, Zhuang, Shen, Nan, Sha, Liu, Ai, Ding, Mingxing, and Ding, Yi

Subjects
BIOLOGICAL models, STATISTICS, GOATS, GLYCERIDES, AMIDASES, ANIMAL experimentation, IMMUNOHISTOCHEMISTRY, ONE-way analysis of variance, ILEITIS, CELL receptors, TREATMENT effectiveness, COMPARATIVE studies, RESEARCH funding, ALLERGIES, CANNABINOIDS, STATISTICAL sampling, ELECTROMYOGRAPHY, DATA analysis software, DATA analysis, VISCERAL pain, ILEUM, CENTRAL nervous system, ELECTROACUPUNCTURE, FATTY acids, DISEASE complications, EVALUATION
Abstract

Background: Electroacupuncture (EA) can effectively relieve visceral hypersensitivity (VH). However, its mechanisms are still unclear. Objective: To investigate the impact of EA on VH caused by ileitis, and whether EA relieves VH by modulating the endogenous cannabinoid system (ECS). Methods: Thirty male native goats were randomly divided into a saline-treated control group (Saline, n = 9) and three 2,4,6-trinitro-benzenesulfonic acid (TNBS)-treated VH model groups that underwent injection of TNBS into the ileal wall to induce VH and remained untreated (TNBS, n = 9) or received six sessions of EA (for 30 min every 3 days) (TNBS + EA, n = 6) or sham acupuncture (TNBS + Sham, n = 6). The visceromotor response (VMR) to colorectal distention (CRD) was measured after each EA treatment. Three goats in the Saline/TNBS groups were euthanized after 7 days for histopathological examination; the remaining 24 (n = 6/group) underwent sampling of the ileal wall, T11 spinal cord and brain nuclei/areas related to visceral regulation and ascending pain modulation system on day 22. Expression of cannabinoid receptor 1 (CB1R), fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL) was detected by immunohistochemistry. Results: VMR to CRD was greater in TNBS-treated goats than in saline-treated goats (p < 0.01) from day 7 to 22. After day 7, EA-treated goats showed a decreased (p < 0.05) VMR compared with untreated TNBS-exposed goats. TNBS treatment decreased CB1R and increased FAAH and MAGL expression in the ileum and related nuclei/areas; this was reversed by EA. Conclusion: EA ameliorates VH, probably by regulating the ECS in the intestine and nuclei/areas related to visceral regulation and descending pain modulation systems. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results