In this article, we suggest an efficient beam switching technique for the emerging 60GHz wireless personal area networks. Given pre-specified codebooks, process, aiming to identify best beam-pair data transmissions, is formulated as a global optimization problem in two-dimension plane that formed by potential pattern index. As analytical gradient information of objective reward function practically unavailable, Rosenbrock numerical algorithm properly adopted implement searching, implicitly...

Mobile edge computing (MEC) is a novel technique that can reduce mobiles' computational burden by tasks offloading, which emerges as promising paradigm to provide capabilities in close proximity mobile users. In this paper, we will study the scenario where multiple mobiles upload MEC server sing cell, and allocating limited resources wireless channels between becomes challenge. We formulate optimization problem for energy saved on with being dividable, utilize greedy choice solve problem. A...

Following successful adoption of cloud computing, many service providers (SPs) are now using high-performance Virtual Machines (VMs) located in large datacenters owned by public infrastructure to deploy their virtual network functions (VNFs). Since these VMs has a cost depending on utilization time, complex problem VNF placement and scheduling (VPS) must be addressed achieve satisfactory performance (e.g., latency) while minimizing the paid lease VMs. In this study, cost-efficient VPS scheme...

Na-, K- and Mg-ion batteries (NIBs, KIBs MIBs) have drawn considerable interest due to their high abundance excellent safety.

In recent years, Wireless Body Area Network (W-BAN) is attracting more and attentions with its various applications like the medical CE application. And these present diverse quality of service (QoS) requirements, so it necessary to design a medium access control (MAC) protocol support differentiated services for traffics coexisting in WBAN. Addressing this problem, paper, new scheme named priority-based adaptive timeslot allocation (PTA) proposed differentiate QoS priority classified data...

Cognitive radio can increase spectrum utilization and avoid interference to licensed users by sensing. However limitations exists in local sensing single cognitve node. Although several methods of cooperative scheme are proposed, they were not checked under different SNR levels. Based on the investigation cooperation between CR nodes levels, we propose neighbor exchange untilization, decreasing primary licensee also traffic load whole networks.

This article puts forward a method for codebook design to support beamforming mechanism in 60GHz millimeter-wave wireless communication environment. The is designed with only phase shifting but not any amplitude adjustment meet the low power consumption requirement. IEEE802.15.3c beam MRA (main response axis) directions are taken as original version make curve fitting, so that weighting vector based on uniform can be obtained generate matrix. simulation results show that, compared...

Due to the lack of spectral resource in traditional low frequency bands and great demand for capacity wireless communications, millimeter wave (mmWave) communications is considered as a key technology upcoming 5G networks. Large scale antenna arrays hybrid precoding are employed compensate high path loss mmWave propagation. In this letter, based on decomposition problem, we propose novel algorithm massive multiple-input multiple-output (MIMO) system, which has computational complexity....

To overcome imperfection of exhaustive based beam searching scheme in IEEE 802.15.3c and 802.11ad accelerate the training process, combined with fast algorithm previously proposed, this paper proposed a codebook design for phased array to not only satisfy algorithm's demand, but also make good use advantage algorithm. The simulation results prove that performs well on flexibility time complexity, has high success ratio.

Millimeter wave (mmWave) communications have been regarded as a key technology for the next generation cellular systems since huge available bandwidth can potentially provide rates of multiple gigabits per second. In mmWave multiple-input multiple-output (MIMO) systems, conventional precoding is infeasible due to hardware cost and power consumption. Therefore, hybrid considered promising compromise between complexity system performance. this paper, we investigate designs precoder combiner in...

In millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems, hybrid precoding has been widely used to overcome the severe propagation loss. order improve spectrum efficiency with low complexity, we propose a joint algorithm for single-user mmWave MIMO systems in this paper. By using concept of equivalent channel, proposed skillfully utilizes idea alternating optimization complete design RF precoder and combiner. Then, baseband combiner are computed by calculating singular value...

Millimeter wave (mmWave) communication is expected to be a key technology for 5G networks, because it can provide high data rates and large available bandwidth. Large antenna array necessary applied mmWave system overcome the path loss. Restricted by power consumption complexity, traditional digital precoding cannot used system. Therefore, analog radio frequency signal processing introduced simplify architecture of precoder. In this paper, we propose dominant vector approaching (DVA)...

Having the ability to provide an ultrafast and high-rate data exchange, millimeterwave (mmWave) massive MIMO has been viewed as one of technologies with most potential for vehicular cellular systems in next-generation wireless communications.To alleviate adverse influence huge path losses, beamforming techniques are always introduced various mmWave sufficient channel gains.However, it is important note that traditional estimation algorithms may no longer be available networks due rapid...

Massive multiple-input-multiple-output (MIMO), also known as very-large MIMO systems, is an attracting technique in 5G and can provide higher rates power efficiency than 4G. Linear-precoding schemes are able to achieve the near optimal performance, thus more attractive non-linear precoding schemes. However, conventional linear massive such regularized zero-forcing (RZF) precoding, have near-optimal performance but suffer from high computational complexity due required matrix inversion of...

Ultra-wideband impulse radio (UWB-IR) sensors should comply entirely with the regulatory spectral limits for elegant coexistence. Under this premise, it is desirable UWB pulses to improve frequency utilization guarantee transmission reliability. Meanwhile, orthogonal waveform division multiple-access (WDMA) significant mitigate mutual interferences in sensor networks. Motivated by considerations, we suggest paper a low complexity pulse forming technique, and its efficient implementation on...

Modern communication engineering has brought forward impractical requirements on powerful computation engines as well simple implementations. Apparently, the two aspects are contradicted in most realistic applications. Because of dispersive multipath propagation underwater acoustic channels, traditional coherent and adaptive receivers computationally intensive and, hence, inapplicable to large-scale sensor networks. Inspired by quantum computing nature intelligence that incorporated with...

Considering the potential interference of ultrawideband (UWB) on OFDM-based wireless communication systems, this paper studies coexistence issue between UWB with both impulse radio (IR) and multiband (MB) modulation IEEE802.11n, WiMAX, LTE downlink using physical layer modeling strategy. According to characteristics victim entire models are set up. Based requirements bit error rate (BER) receiver sensitivity three emission limits respectively obtained. Compared a method based noise ratio...

Hybrid precoding has been regarded as a promising technology for millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO) systems due to the low hardware cost and power consumption. This paper focuses on digital analog codebooks design efficiently quantize hybrid precoders with arbitrary-resolution phase shifters in frequency-division duplex systems. We formulate joint optimization problem propose an iteration algorithm obtain enhanced based dictionary learning methods....

In consideration of the overcrowded spectrum resource, it is great importance to study combination cognitive radio (CR) and ultra wideband impulse (UWB-IR). UWB scene, pulse supposed constantly change its according state primary users mitigate potential interference these vulnerable wireless systems. Meanwhile, frequency utilization still eagerly requires improvement guarantee their transmission reliability. this paper, we propose a novel based on neural network, simple implementation has...