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This paper proposes a novel indoor-outdoor caching relay system (CRS) and develops the corresponding caching mechanism, which can improve the utilization of wireless resources. It operates in two phases periodically. In Phase I, spectrum resources of the established links between MBS and user equipment (UE) are extracted to support data caching. In Phase II, caching relay system can directly serve...
Network-on-Chip (NoC) is a communication paradigm capable of facilitating a scalable interconnection infrastructure for multi core processors. Wireless NoCs have been introduced to improve the communication performance over long-distance processing nodes. Current on-chip antennas used in wireless NoCs communicate predominantly through surface waves, where the efficacy of the wireless nodes is partially...
In this paper, 10 × 10 MIMO antennas have been designed for access point and handset application. Then, the proposed 10 × 10 MIMO antennas have been implemented on a low cost FR-4 substrate. These antennas realizes a good performance under MIMO situations with low mutual coupling (<15 dB) and low correlation coefficient (<0,5). This paper also presents indoor field performance measurement which...
This work presents a high-throughput and low-latency Index Terms-matrix inversion design for a linear pre-coder for massive MIMO systems. Because of the large number of Base Station (BS) antennas as well as the multiple User Terminals (UTs) served in a massive MIMO system, the channel matrix dimensions become larger. Inversions of such large matrices using direct inversion methods, such as used in...
In this paper, we investigate the performance of an amplify-and-forward two-way relay network, in which the relay can harvest the energy from the radio frequency and all channels are subject to Nakagami- \textit{m} fading. In particular, we assume that the relay has a single antenna, while two sources are equipped with multiple antennas. Also, two sources use the maximal ratio transmission (MRT) and...
We derive the Multiple-Input Multiple-Output (MIMO) efficiency of the Zero-Forcing (ZF) receiver algorithm in Random Line-Of-Sight (Random-LOS). We make use of the Probability-of-Detection (PoD) curves based on the ideal digital threshold receiver model in the derivations. We show that the MIMO efficiency in this case, is mainly determined by two factors: the smallest channel gain of the two available...
In this paper, we consider a two-way relay (TWR) system in which two multi-antenna source terminals communicate with the help of an energy harvesting (EH) single-antenna relay utilizing the time switching relaying (TSR) protocol. Assuming beamforming at the terminals and analog network coding (ANC) at the EH based TWR, we derive expressions for the outage probability of the system for Rayleigh fading...
Currently, high-speed IEEE802.11n interfaces using MIMO have become common in access points (APs) and personal computers (PCs) for wireless local-area networks (WLANs). This trend leads to further expand the application areas for WLANs. In this paper, we present throughput measurement results of IEEE802.11n devices with various placement orientations in indoor environments. They show that measured...
We propose a novel, near-optimal data detection algorithm and a corresponding FPGA design for large multiple-input multiple-output (MIMO) wireless systems. Our algorithm, referred to as TASER (short for triangular approximate semidefinite relaxation), relaxes the maximum-likelihood (ML) detection problem to a semidefinite program and solves a non-convex approximation using a preconditioned forward-backward...
Downlink (DL) transmission performance highly relies on the accuracy and delay of the quantized channel state information (CSI) feedback, which is conversely an overhead for the system. Therefore, net throughput is an advisable criteria to design the feedback scheme. Unlike previous works, we firstly provide a quantized channel prediction method by calculating the error variance of random vector quantization...
We study the uplink multi-user multiple-input multiple-output (UL MU-MIMO) channel in a wireless local area network (WLAN) with multiple access points (APs) and multiple stations (STAs). APs are allocated with different orthogonal frequency-division multiplexing (OFDM) subcarriers. Each AP has multiple antennas and applies zero-forcing successive interference cancellation (ZF-SIC) as in [1] for spatial...
In this paper, we address the energy efficient resource allocation problem for a secure orthogonal frequency division multiple access (OFDMA) relay system. In particular, we consider there is a eavesdropper near the base station (BS) which tries to overtake the information sent by BS. We formulate the joint optimization problem with the objective to optimize the energy efficiency of the considered...
In response to ever-increasing of mobile broadband data traffic demands, integrating unlicensed carrier into the traditional LTE system on licensed spectrum, namely Unlicensed LTE (U-LTE), is an effective solution. Considering that the unlicensed spectrum is shared by a variety of communication systems such as the Wi-Fi system, one essential target of U-LTE design is to guarantee fair co-existence...
Multi-connectivity is a promising concept for addressing challenging requirements in next generation wireless networks. We put forward a modeling framework for analyzing signal-to-interference-and-noise ratio (SINR) distributions in inter-frequency multi-connectivity scenarios. The most important features are a best server association based on random shadowing, multiple path loss models, and intra-/inter-frequency...
Caching popular contents at base stations (BSs) is a promising way to unleash the potential of cellular heterogeneous networks (HetNets), where backhaul has become a bottleneck. In this paper, we compare a cache-enabled HetNet where a tier of multi-antenna macro BSs is overlaid by a tier of helper nodes having caches but no backhaul with a conventional HetNet where the macro BSs tier is overlaid by...
Cellular networks are witnessing an exponential traffic growth leading to an increase in Energy Consumption (EC), and having both environmental and economic impact. Recently, different approaches have been studied to build Green cellular networks focusing mainly on the Base Stations (BSs) as the access network represents 80% of the total wireless network consumption [1] [2]. One of the promising solutions...
In order to enhance the Long Term Evolution (LTE) network performance, the Third Generation Partnership Project (3GPP) introduced Coverage and Capacity Optimisation (CCO) in the context of Self Organising Network (SON). Antenna parameters (i.e. azimuth, electrical tilt etc.) play a key role in CCO and have a significant impact on the users' Quality of Service (QoS). In this paper, a novel metric,...
This paper introduce one novel in-lab test method to reproduce a field radio channel data in lab, and use one recorded field data as an example to evaluate TDD-LTE UE performance. Firstly, it presents the field measurement method based on the scanner, and then to introduce accurate modeling way as conversion to generate in-lab playbacking file and also mapping to support CE based MPAC test solution,...
Different standardization bodies are working towards test methodologies and procedures to determine true Multiple Impute Multiple Output (MIMO) performance. A reference CTIA (Cellular Telecommunications and Internet Association) 2×2 Long Term Evolution (LTE) MIMO antenna concept has been designed [1–2] and verified [3] to eliminate the uncertainties linked to the unknown antenna performance of the...
AeroMACS (Aeronautical Mobile Airport Communications System) is an aeronautical wireless communication standard which provides high-speed fix/mobile network on the airport surface. AeroMACS is expected to gain the safety and efficiency of the airport operations by allowing the stakeholders such as air navigation service providers, airline companies, and airport authorities to exchange massive data...
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