Zhuyan Zhao

Nokia · T&I/ radio system

Recently, ambient backscatter attracts much attention since it can utilize ambient radio frequency signals to enable battery-free devices to communicate with others. Most existing studies about ambient backscatter assume that the reader is equipped with one receiving antenna. In practice, the reader can utilize multiple antennas to overcome channel...

Future IoT applications provoke the connectivity and reliability requirements of machine-type communications, which yield mMTC and URLLC, respectively. In mMTC, grant-free NOMA is adopted to serve massive machine-type devices with low signaling overhead. The challenge of grantfree NOMA for mMTC is the collision induced by non-orthogonal resource al...

The fifth generation (5G) wireless communication is currently a hot research topic and wireless communication systems on high speed railways (HSR) are important applications of 5G technologies. Existing studies about 5G wireless systems on high speed railways (HSR) often utilize ideal channel parameters and are usually based on simple scenarios. In...

The next generation cellular network is to provide a large variety of services for different kinds of terminals, from traditional voice and data services over mobile phones to small packet transmission over massive machine-type terminals. Although orthogonal-subcarrier based waveforms are widely used nowadays in many practical systems, they can har...

To study the effects of microRNA-98 (miR-98) on human bone mesenchymal stromal cells (hBMSCs). The patients undergoing hip arthroplasty were selected by inclusion/exclusion criteria for this study. The extracted hBMSCs were detected of osteogenic differentiation by alizarin red S staining, and of cell phenotype by flow cytometry. Bioinformatics, du...

One of 5G communication typical scenarios is machine-to-machine communication with large number of devices, which proposes new requirements for uplink transmission. Filter bank multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) is one of the popular nonorthogonal waveform candidates for 5G transmission. In this paper, FBMC/OQAM a...

As the next generation cellular system, 5G network is required to provide a large variety of services for different kinds of terminals, from traditional voice and data services over mobile phones to small packet transmission over massive machine-type terminals. Although orthogonal-subcarrier based waveform has been widely used nowadays in many prac...

The channel nonstationarity caused by the train mobility is measured for the composite high-speed railway (HSR) scenario. The time-varying quasi-stationarity region analysis is based on spectral divergence (SD) metric carried on different frequencies. An obvious transition region is found in composite HSR. Moreover, based on the comparison of diffe...

This paper focuses on the influence of mobility in rapidly time-varying channels. Local and global behaviors are researched based on the path-based channel model and ray-tracing channel model, respectively. The scenario employed in the global behavior analysis is a realistic composite high-speed railway (HSR) scenario, which is reconstructed by Ske...

To attain seamless handover and reduce the han- dover failure probability for high-speed railway (HSR) com- munication systems, this paper proposes a remote antenna unit (RAU) selection assisted handover scheme where two antennas are installed on high speed train (HST) and distributed antenna system (DAS) cell architecture on ground is adopted. The...

For the emerging applications such as Google Talk, Facebook, Skype and QQ, to mention a few, which run on smartphones, background traffic has become one of the significant issues in system design and optimization. Because of the complicated user behavior and interaction, the assumptions underlying the Poisson process model cannot be met; the Poisso...

Objective: We analyzed the correlation between mutation in intron 4 and exon 7 of endothelial nitric oxide synthase (eNOS) and avascular necrosis of femoral head (ANFH). Method: A total of 260 ANFH cases without history of hip joint injuries were diagnosed and subject to staging according to Ficat standard, with 262 health subjects as control. V...

Based on the fog drop size distribution (DSD) model of radiation and advection fog, the propagation attenuation of the fog is obtained in THz band by using Rayleigh absorption approximation and Mie theory. The results show that the fog attenuation in THz band is larger than that in microwave and millimeter band. The attenuation is increases as the...

Discontinuous Reception (DRX) operation is specified by Long Term Evolution (LTE) for power saving of user equipment (UE). In this paper, we evaluate the performance in terms of the power consumption and average packet delay of a novel adaptive DRX mechanism designed for delay tolerant applications with a flexible Short/Long DRX Cycle switching sch...

In the wireless broadband network, most traffic are generated from indoor users. Meanwhile the indoor coverage is identified as the major bottleneck especially in dense urban environment with high-rising buildings. In this paper, the TD-LTE network downlink performance of indoor is studied with various network deployment options, including outdoor...

Keep-alive messages generated from always-on type applications on smartphones can lead to frequent transitions between Long Term Evolution (LTE) Radio Resource Control (RRC) states, pushing significant increase of signaling traffic. In this paper, we investigate the performance of signaling overhead caused by keep-alive messages based on LTE RRC st...

With the rise of the user base of smartphones, the cellular networks are facing increasing uplink signalling traffic pressure caused mainly by the soaring background traffic of smartphone applications. Therefore, this paper studies the LTE radio resource control (RRC) state transition, which is highly related to the amount of signalling traffic, ca...

In the wireless broadband network, most traffic are generated from indoor, and the indoor coverage is identified as the major bottleneck especially in dense urban environment with high-rising buildings. In this paper, the TD-LTE network downlink performance of indoor is studied with various deployment options, including outdoor Macro and Micro cell...

In this paper, capacity and coverage performances by deploying vertical sectorization in HSPA networks are evaluated. A novel resource-scheduling scheme for vertical sectorization is proposed to improve the SINR of cell-edge users. Performances of both conventional vertical sectorization and proposed mechanism are investigated through analysis and...

Type1 in-band relaying is supported by Long Term Evolution Advanced (LTE-Advanced). Based on the frame structure defined in 3GPP LTE, a down link radio frame is partitioned into access and backhaul sub-frames. In the access sub-frames, the direct link and access link transmissions can take place simultaneously with full frequency reuse. In the back...

The wireless network gradually changes from voice service to broadband data access services and faces unprecedented growth in data traffic. The way to meet future capacity demand is by combining macro site expansion and outdoor micro layer deployment. Thus it is important for the operator to understand the basic cost and performance of different co...

The wireless network gradually changes from voice service to broadband data access services and faces unprecedented growth in data traffic. The operator needs to prepare network upgrade road map in advance according to their own situation. TD-LTE is considered as providing the evolution path for TD-SCDMA. To reduce network CAPEX and OPEX, TD-LTE ne...

The network throughput of a Wireless Mesh Network (WMN) can be improved by utilizing multiple channels, multiple radio interfaces and directional antenna technology. When the numbers of available channels and radio interfaces in a WMN system are constant, efficient time scheduling among links is essential to avoid potential interference and conflic...

A potential application of Wireless mesh networks (WMN) technology is using WMN as backbone for wireless access networks. In WMN backbone, the throughput is mainly limited by 2 factors: the ingress/egress congestion in gateway and link interference caused by simultaneous transmissions. Recent study found deploying multiple gateways in WMN is an eff...

Wireless mesh networks (WMN) is designed as an economical solution for last-mile broadband Internet access. The Mesh nodes can directly communicate with each other, thus forming a tree, and can be used to forward the data packets to network gateway in multi-hop fashion. The way this tree is built have a deep impact on the effective throughput of th...