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Energy efficiency of uplink users is critical for evaluating the energy consumption of heterogeneous cellular networks (HCNs) with heavy loading. The energy efficiency of user equipments (UEs) in HCNs depends heavily on power control scheme as well as maximum power constraint. This paper investigate the energy efficiency of uplink UEs in HCNs taking into account the flexible power control policy along...
Spectrum prediction, as one enabling technique for dynamic spectrum access (DSA), has recently been received ever-increasing research attention. Most related studies (explicitly or implicitly) assume that spectrum prediction is useful for DSA. However, it does't fundamentally clear when spectrum prediction is really beneficial. To address this issue, this paper firstly provides a high-level review...
Spectrum data, which is usually characterized by many dimensions, such as location, frequency, time and signal strength, presents formidable challenges in terms of acquisition, processing and visualization. In practice, a portion of spectrum data entries may be unavailable due to the interference during the acquisition process or the compression during the sensing process. However, the completion...
In this paper, the average uplink transmission rate and outage probability of UEs are analyzed in heterogeneous small cell networks. The impact of the power control coefficient on both system performances is evaluated taking into account the intercell interference in a stochastic geometry network. Furthermore, we propose an energy-efficient uplink power control scheme, which adjusts the power control...
In this paper, the uplink outage probability and energy efficiency of user terminals are investigated for heterogeneous networks (HetNets). In order to characterize the performance of users in small cells, the probability distribution function (PDF) of the distance between a user terminal and the access point (AP) in the typical small cell is derived in closed-form expressions. On this basis, the...
For noncircular signals, optimal widely linear (WL) minimum variance distortionless response (MVDR) beamformer has a powerful performance by exploiting the noncircularity of the received signals. Though, the noncircularity rate can be estimated by the steering vector (SV) of the signal of interest (SOI), the performance degrades as there exist errors in the SOI's SV. This paper introduces a new robust...
It is of great importance for service providers to evaluate the impact of inter-cell co-channel interference on the outage probability in cellular networks. In this paper, the probability density function (PDF) of interference factors limited by power control scheme is derived. Moreover, a series-form outage probability affected by the interference from Poisson-Voronoi tessellation (PVT) cellular...
It is of great importance for service providers to evaluate the impact of inter-cell co-channel interference on the achievable data rate in cellular networks. In this paper, the cumulative distribution function (CDF) of the inter-cell interference factor is derived. On this basis, closed-form expression of the maximum achievable rate subject to the interference from finite planar cells is analyzed...
Recently, issues of power consumption at base stations (BSs) in wireless cellular networks have attracted great interest in both research communities and the industry. In this paper, we investigate the BS power consumption in multiple-input single-output (MISO) Poisson-Voronoi tessellation (PVT) random cellular networks. Taking into account the inter-cell interference, the impact of the traffic demands...
We experimentally demonstrated a highly compact 1-to-2 multimode interference splitter to achieve polarization insensitive ultra-low loss behavior. The excess loss is 0.112 dB and 0.184 dB for TE and TM mode, respectively.
A semi-finished single mode multimode single mode fiber structure with an air gap is investigated and its displacement sensing characters are proposed. The distance between the MMF and the SMF used as a "receiver" can be detected by tracing the associated minimum position of waveform in spectrum. Good linearity is shown in the relationship between displacement and wavelength.
In this paper, we focus on the joint stream control and scheduling algorithm based on Multiple Input Multiple Output (MIMO) technique which can significantly improve network capacity without additional increase of bandwidth or transmit power. We propose a stream control algorithm to maximize the network capacity and develop a universal framework for capacity evaluation for MIMO Mesh networks. Simulation...
QoS provisioning in wireless mesh networks has been to known as a challenging issue. In a distributed scheduling based wireless mesh backhaul network, conventional connection-based QoS provision mechanism requires considerable amount of overhead for per-link QoS signaling, thus cannot support high speed real time traffic. In this paper,we propose a DiffServ-like QoS provision mechanism for IEEE 802...
Extracting effective and reliable features is fundamental and critical for constructing target recognition systems. Flexible Feature Processing Mechanism emphasizes the integration of feature extraction arithmetic and the self-adaptation of feature selection. On one hand, it would try to dig up the valuable information on as many as possible aspects, so as to construct the feature extraction method...
It is an important method for enhancing the stiffness of technical equipment and positioning accuracy to adopt over-positioning reasonably. However, research papers are so scarce in the theoretical field of this issue. A quantitative calculation method of over-positioning accuracy and interference probability with plane multi-pin is proposed, the calculation formula is deduced, and the phenomenon...
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