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This paper presents the channel capacity analysis for next generation mobile networks using millimeter waves (mmW) under generalized fading scenarios. α-μ and κ-μ fading channels, which respectively represent the nonlinearities of the propagation medium and the small-scale variations of the fading signal under line-of-sight, that are the typical expected scenarios for mmW, are investigated here. Ergodic...
In IEEE802.16m and LTE technologies, they all possess the advantages of high transmission rate and wide bandwidth. In information transmission between the mobile user and the base station it involves the propagation loss, the shadow fading loss due to building blocking and obstructions and the Doppler Effect due to the relative motion between the mobile user and the base station that will result in...
In this paper, we present a physical scenario analysis for two formats of eta-mu fading distribution i.e. Format 1 and Format 2, respectively. Generally the performance of wireless communication system depends on the characteristics of the fading channel. Hence it is necessary to study the behaviour of the fading phenomena. The small - scale variation of the faded signal is better represented by eta-mu...
With the growing demand for higher data rate networks, OFDM has emerged as a key technology for 4G standards like 3GPP LTE, IEEE 802.16m WiMAX and IEEE 802.11n WLAN. With its robustness to frequency selective fading, high spectral efficiency and ease of implementation by means of Discrete Fourier Transform(DFT), OFDM is a cutting edge technology for Broadband mobile wireless. Along with its compatibility...
Over the last decade, mobile data traffic has risen dramatically and the amount of UL and DL transmissions has been characterized by substantial asymmetry and time variations. Dynamic time-division duplex (TDD) has the capability to accommodate to the traffic asymmetry by adapting the UL/DL configuration to the current traffic demands. In this work, we study a two-tier heterogeneous network (HetNet)...
The development of dual polarized digital beamforming techniques shows a bright prospect of high rate Mobile Satellite Communications (MSC). It is a Multi-User Multi-Input Multi-Output (MU-MIMO) network if all user terminals in this network are equipped with dual polarized antennas. The present work focuses on introducing the Proportional Fair (PF) scheduling into this network. The main problem is...
This paper proposes an adaptive hybrid digitalanalog video transmission scheme to eliminate cliff effect and improve user experience in wireless mobile networks. To achieve graceful degradation performance, each Group of Pictures (GOP) is transformed and efficiently compressed into a reference frame and several Motion Vector (MV) frames with Motion-Compensated Temporal Filtering (MCTF). Then, the...
Cellular operators have concluded that small cell deployments are a very cost-effective and quick solution to meet the ever growing demands on capacity and coverage in cellular networks for indoor and outdoor environments. While traveling in public transit vehicles, cellular subscribers usually experience poor signal reception and low bandwidth. We hence consider deploying small cells onboard (i.e...
In this paper we investigate the small-scale fading characteristics of body-to-body communications channels in an urban environment at 2.45 GHz. The experiments considered body-to-body channels between devices positioned on two persons on either side of a busy road. The Ricean-K factors estimated from the measurements suggest that a significant dominant component existed in the majority of the channels.
This paper discusses the problem of minimizing the energy used to transmit packets over a memoryless channel, with a constraint on the delay suffered by packets and a constraint on peak transmitter power. The problem is studied within discontinuous reception (DRX) supported system. Specifically, we seek a DRX-compatible transmission policy that can solve the problem without the knowledge of fading...
In this paper, we investigate scenarios where 4G LTE base stations are mounted on balloons raised in the sky for the provision of cellular connectivity and coverage within an area of few kilometers (e.g., scenarios for emergency communications). In this context, the link between the base stations need to be completed using wireless technologies, thus impacting the performance of the X2 logical interface...
A wireless heterogeneous network with a mixed deployment of high power and low power wireless nodes has received tremendous attentions lately due to it great potentials in increasing network capacity and coverage as well as achieving energy saving. Mobile association is one of the key mechanisms to fully exploit the capacity and coverage benefits offered by a heterogeneous network. Meanwhile, there...
A novel statistical model, called RM model, on the mobile channels is proposed. The envelope of the received signal is modeled as a Rician signal with exponent M. The Probability density function (PDF) in dB is derived by using signals in dB. The expectation of received signals (in dB) is in directly proportional to M.
Mathematical analysis, supported by computer simulations is used to find a theoretical limit to cell size reduction in cellular wireless network in a shadowed fading environment. Information capacity measure based on the uplink of cellular wireless network is used for the analysis. Results show that at higher microwave carrier frequencies and smaller cell radius some of the second tier co-channel...
In this paper, a detailed link level simulation has been studied and optimized to investigate the physical layer performance of Worldwide Interoperability for Microwave Access (WiMAX) IEEE 802.16e over AWGN and multipath Rayleigh fading channels, in which ITU-Reference channel models have been used. Two 802.16e based OFDMA transceivers have been designed by using MATLAB Simulink, the first one doesn't...
This article examines a femtocell-based scheme as a prospective means to enhance the performance of current cellular systems. In the adopted framework, femtocells are tasked with connecting local devices to the network of a mobile operator without creating undue interference to cellular users. The access point of a femtocell only possesses limited information about its parent cellular infrastructure...
Opportunistic scheduling exploits multiuser diversity for improving the performance of wireless systems. However, it requires instantaneous channel state information (CSI) to be available at the transmitter side. Since acquiring CSI is resource consuming, it always comes at a cost. We consider the problem of efficient channel state estimation in the context of 4G mobile broadband systems. Our proposed...
Securing communication in mobile wireless networks is challenging because the traditional cryptographic-based methods are not always applicable in dynamic mobile wireless environments. Using physical layer information of radio channel to generate keys secretly among wireless devices has been proposed as an alternative in wireless mobile networks. And the Received Signal Strength (RSS) based secret...
This paper presents an approach to model small scale fading effects on the wireless propagation channel adapted from a statistical baseband, multipath model in the time domain. The model is intended to be used for narrowband systems like Cognitive Programme Making and Special Event applications (C-PMSE) with a variaty of possible operation frequencies in the Ultra High Frequency range. The determination...
The conflict between energy consumption and battery capacity has become more significant in modern mobile terminals that support various functions in addition to traditional voice. It is of great importance to extend battery lifespan and at the same time to guarantee the required quality of service (QoS). In this paper, we investigate the relationship between the battery lifespan of a mobile terminal...
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