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Methods of modern GNNS organization, their frequency bandwidth and signals generation were described. Nowadays bandwidth for every field of concern is strongly limited. Popularity of radionavigation leads to overlapping spectrum. Modern GNSS are using signals with CDMA to minimize interference. The signals non-orthogonality interference are named multiple-access interference. The multiple-access interference...
Memory interference is a critical impediment to system performance in MPSoCs. To address this problem, we first propose a Locality-Aware Bank Partitioning (LABP), which partitions memory banks according to applications' memory access behavior. The key idea is to separate memory intensive applications with high row-buffer locality from the other applications. Moreover, we integrate LABP with a bandwidth...
Scheduling process is a tedious task in heterogeneous networks because of the large number of users and the reduced radio resource facilities. Scheduling is nothing but granting certain number of sources to the users in a frequency and timing fashion. Resources define the symbols and subcarriers for transmitting the bits in scheduling. There are many ways to assign these things to the subscribers...
We demonstrate a microwave photonic Interference canceller with a balanced architecture capable of relative-intensity noise suppression. Experimental results show that the system can cancel > 25 dB interference over 200 MHz instantaneous bandwidth and tune over a frequency range of 2–8 GHz.
The key indicators of analog to digital converter (ADC) are effective number of bits (ENOB) and spurious-free dynamic range (SFDR). ENOB would affect the input signal to noise ratio (SNR), and SFDR indicates the degree of spurious introduced by non-linear. The characteristics of multi ADC in antenna array would not be the same, which make the quantization noise introduced by ENOB and spurious indicated...
Channel allocation possibilities of femtocells are analyzed in this work. Femtocells have gained importance in the recent times because of their scope to offer better frequency reuse in cellular systems. They are poised to play their prominent role in future 5G systems also. While allocating the operating frequencies to femtocells, care needs to be taken to avoid interference with neighboring femtocells...
Ultra Wideband (UWB) is a new emerging and promising technology as it can accommodate higher data over a large bandwidth. we proposed a compact printed monopole UWB antenna with 3.4GHZ band-notched Characteristics. A simple square patch antenna has been fed through a 50 Ω microstrip feedline and a rectangular notch has been etched on the ground plane to reject the interference of WIMAX Band (3GHZ–4...
Spectral efficiency and energy efficiency are important design criteria for green communications. In this paper, spectral efficiency and energy efficiency are addressed for transmission over channels that are orthogonal in frequency. The maximum sum rate is used in measuring the spectral- and energy-efficiency. The combined spectral- and energy-efficiency of particular total bandwidth and total transmit...
Abstract-In this paper, we investigate a network with N pairs of users transmitting on the same channel simultaneously from the energy efficiency (EE) perspective. We formulate a non-concave multi-objective optimization problem (MOOP) to investigate the EE tradeoff, taking into account the minimum data rate requirement of each user. The weighted Tchebycheff method is utilized to solve the MOOP by...
Joint transmission (JT), an attractive coordinated multipoint (CoMP) downlink transmission technique, is used to increase cell-edge user throughput, but has to distribute the same user data to multiple base stations termed a JT cluster, thus leading to a huge burden on backhaul bandwidth. Therefore, recent studies considered caching user data at the base stations to reduce the backhaul bandwidth consumption...
The number of e-commerce customers and database services in cloud computing platforms has grown increasingly, leading providers to adopt resource-sharing solutions to meet growing demand for infrastructure resources, such as processing and storage. Consolidating database applications has become arguably a de-facto solution to support a large number of customers/tenants at low infrastructure costs...
In Uplink Coordinated multipoint (Uplink CoMP) schemes as in LTE [1], multiple base-stations (EnodeBs) receive signals from the same user equipment (UE). Combining this information appropriately using the backhaul is known to yield high gains, especially when the interference avoidance is used across the EnodeBs in CoMP. We consider a load-balanced, dense, small-cell deployment where a UE may be connected...
In wireless sensor networks, the need for ultra- low power consuming nodes is one of the main motivations for research in such field. Because radio sections in sensor nodes contribute to a large extent to the overall power consumption, the focus of this study is on the RF transceiver. The aim is to reduce the average power consumption which depends significantly on the circuit architecture design,...
Heterogenous wireless networks (Hetnets) provide a powerful approach to meet the massive growth in traffic demands, but also impose a significant challenge on backhaul. Caching at small base stations (BSs) and wireless small cell backhaul have been proposed as attractive solutions to address this new challenge. In this paper, we consider the optimal caching and user association to minimize the total...
Power ramping is one of the mechanisms proposed to help alleviate congestion during random access in LTE cells. We evaluate its performance taking into account preamble SINR considerations as well as Physical Downlink Control Channel (PDCCH) deficiency. Our results show that power ramping can speed up access at small to moderate loads, but that it is actually detrimental at moderate to high loads,...
The integration of millimeter-wave base stations (mmW- BSs) with conventional microwave base stations (μW-BSs) is a promising solution for enhancing the quality-of- service (QoS) of emerging 5G networks. However, the significant differences in the signal propagation characteristics over the mmW and μW frequency bands will require novel cell association schemes cognizant of both mmW...
Abstract-Unlicensed LTE system holds high potential to effectively offload data/video traffic from the crowded licensed band. Previous effort of deploying LTE in the unlicensed band (e.g. license-assisted access LAA) relies on one or more LTE carriers in the licensed band, and may not be desired in certain scenarios. This paper studies a new technology of utilizing LTE directly in an unlicensed band,...
The use of spread spectrum underlay signals has been widely proposed in cognitive radio contexts as a means to provide available spectrum for secondary users. Underlay signals are generally transmitted on a minimal interference basis to prevent disruption of the primary user(s). This paper proposes concepts for integrating the use of arbitrary, digitally modulated signals (primary) with time- and...
In this paper, we investigated the spectrum sharing problem for Device-to-Device (D2D) communications in ultra-dense 5G cellular networks. We propose a simple method for D2D traffic to operate in coexistence with the legacy cellular traffic. We develop a two-step distributed algorithm for channel allocation and mode selection (i.e. cellular mode or D2D mode) for the mobile station (MS) with the objectives...
Recent studies have demonstrated that millimeter-wave cellular networks may operate either in the noise-or in the interference-limited regime, depending on several parameters, which include the density of base stations, the density and size of obstacles/blockages, the antenna beamwidth, and the transmission bandwidth. The objective of the present paper is to exploit tools from stochastic geometry...
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