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In this paper, we consider the performance analysis of the distributed eigenvalue estimation technique based on the decentralized power method (d-PM) and the averaging consensus (AC) protocol. An analytical asymptotic expression of the second order statistics of the eigenvalues obtained from the d-PM is presented. This expression is essential for assessing the performance of estimators which are based...
In this paper, we study the performance of a multi-hop relaying network with finite blocklengths under quasi-static Rayleigh fading channels. The throughputs under the assumption of infinite blocklengths (IBL-throughput) as well as under the assumption of finite blocklengths (FBL-throughput) are studied, respectively. In particular, the FBL-throughput is considered under two scenarios, i.e., either...
Carrier aggregation (CA) is one of the key features of LTE-Advanced. On one hand it allows to boost the system capacity and on the other hand it enables dynamic spectrum access, such as licensed assisted access (LAA) and licensed shared access (LSA). Efficiently exploiting CA is however not a trivial task; the main challenges are scheduling, load balancing, dynamic carrier activation/deactivation,...
LTE on unlicensed bands (LTE-U), which is a promising way to meet the increasing mobile data demand, has attracted world-wide interests. However, the fair coexistence of LTE-U and WLAN is a critical issue to be solved. In this paper, we devise a semi-distributed channel access approach for LTE-U in dense deployed scenario to improve its capacity and achieve fair coexistence with WLAN. Specifically,...
In order to meet future communication system requirements, channel estimation over fast fading and frequency selective channels is crucial. In this paper, Space Alternated Generalized Expectation Maximization Maximum a Posteriori (SAGE-MAP) based channel estimation algorithm is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems for Autoregressive (AR) modeled time-varying sparse...
The energy efficiency of a system determines its operational sustainability. Energy harvesting (EH) is a crucial technology for a variety of wireless systems that have limited access to a reliable electricity supply. In this paper, the design of a multiple access relay system (MARS) using EH is considered. We assume that the sources and relay have no embedded power supply but rechargeable energy storage...
Multiple input multiple output-Orthogonal frequency division multiplexing (MIMO-OFDM) is a viable solution for providing high data rate services in harsh channel environments. The optimum receivers for them are those based on the maximum likelihood criterion. However, they have a prohibitive complexity especially when channel dimensions are high and coding is employed. Zero Forcing (ZF) and Linear...
Generalised spatial modulation (GSM) was first introduced with the maximum-likelihood (ML) optimum decoder. However, ML decoder may be infeasible for practical implementation due to its exponential complexity especially when the number of antennas or the constellation size is large. Lattice reduction (LR) aided linear decoders are known to have much lower complexity while achieving near-optimal bit-error-rate...
Delay Tolerant Networks are a special kind of ad hoc networks that consist of a number of mobile devices. In DTNs, network topology frequently changes and source-to-destination communication paths can hardly be sustained. However, some social features have been observed in DTNs by analyzing the real mobile trajectories of DTNs. To utilize these social features to facilitate data routing, we present...
WSNs are achieving significance importance in the information and communication technologies with the development of Internet-of-Things (IoT). WSNs are connected with the Internet in many industrial applications. However, energy efficiency is one of the challenging problems in wireless sensor networks (WSNs). In this paper, an optimized location of cluster heads (CHs) for energy efficiency in a heterogeneous...
Adaptive filters are employed in many signal pro- cessing and communications systems. Commonly, the design and analysis of adaptive algorithms, such as the least mean-squares (LMS) algorithm, is based on the assumptions that the signals are wide-sense stationary (WSS). However, in many cases, including, for example, interference-limited wireless communications and power line communications, the considered...
Device-to-device (D2D) communication is considered as one of the key technologies to support new types of services, such as public safety and proximity-based applications. D2D communication requires a discovery phase, i.e., the node awareness procedure prior to the communication phase. Conventional half duplex transmission may not be sufficient to provide fast discovery and cope with the strict latency...
For a decode-and-forward (DF) relay network, it is typically assumed that the destination adopts a decoder based on maximal-ratio combining (MRC) or its variant. However, due to the presence of error propagation from the relay, an accurate error performance analysis of such decoders is still unavailable. By taking decoding errors at the relay into consideration, we derive an analytical upper bound...
In this paper, we study the transmission over an overloaded downlink wireless communication system, using non-orthogonal multiple access, i.e., one in which the base station transmits to multiple users on the same carriers. The base station as well as the user equipments are assumed to be equipped with single-antennas. First, we show that if the system is to be designed so as to maximize the sum-throughput,...
Despite of the increasing usage of traditional cloud computing, there are still some issues unsolved due to inherent problems of cloud computing, such as long latency and lack of mobility support. The development of mobile cloud computing shows that utilizing the unused resources of mobile devices nearby can achieve better overall system performance. As the surrounding devices are in general have...
We target a heterogeneous LTE cellular network comprising macro eNBs and hot spot micro eNBs and define a comprehensive measure of profitability referred to as sustainability. This metric combines all relevant factors for the economic balance of the cellular access, namely: i) the user profits, which depend on the offered level of Quality of Service; ii) the energy costs of the cellular network; and...
Low Power Wide Area networks aim at connecting low cost devices with high constraints on the link budget. Focusing on the physical layer, the combination of orthogonal modulation and coding in the same process has been shown efficient when associated with a turbo receiver. This work shows how this scheme, based on frequency shift keying modulation, can be efficiently implemented on today low-end platform...
This article presents the evaluation of out-of-band spectral pollution caused by the nonlinearities of the PA at the RF front-end for FBMC/OQAM signals, as well as the improvement of those spectral performances thanks to an envelope dynamic reduction method based on precoding. We also study the in-band spectral pollution by creating notches in the spectrum, in the perspective of fragmented spectrum...
Field Programmable Gate Array (FPGA) architectures, such as Xilinx's Virtex-4 up to 7 series, have enabled partial and dynamic run-time self-reconfiguration for a long time. This feature enables the substitution of parts of a hardware design implemented on this re-configurable hardware, and therefore makes it possible for a system to adapt to the actual demands of applications. Dynamic Partial Reconfiguration...
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