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Polarization diversity is generally achieved by using two orthogonal polarizations on the same link, which enables to double the available bandwidth. In this paper, we study the possibility to connect the nodes of a line-of- sight ring topology network with one single channel for all the links, with the condition that the polarization of any link is orthogonal to the polarization of the two adjacent...
novel Fog Radio Access Network architecture based on General Purpose Processor(GPP) Platform is proposed. Traditionally, people consider fog computing service as an independent computing unit in the Radio Access Network(RAN). Our design, on the contrary, considers both the computing resource for RAN and for fog computing application as an integrated computing resource pool. Based on the observation...
In this paper, a noise estimation method is proposed and examined for spectrum sensing purposes. The proposed method is based on the use of the first Intrinsic Mode Function (IMF), which is the output of the Empirical Mode Decomposition (EMD). This technique is blind and a priori knowledge of the received signal characteristics are not required. Two well known noise-dependent spectrum sensing techniques,...
A single-RF transmitter based on repetitive pulse width modulation (RPWM) was proposed for an alternative system of multiple-input multiple- output (MIMO) system. However, the RPWM transmitter system has a demerit in view of requiring twice the number of antenna elements than the conventional MIMO transmitter. Then we propose an advanced RPWM transmitter which requires the same number of antenna elements...
The accuracy of indoor positioning systems could be significantly reduced by non-line-of-sight (NLOS) propagation. The bulk of existing work on NLOS error mitigation for time-of-arrival (TOA) systems assumes that the NLOS links can be identified and/or the NLOS error statistics are known. To avoid requiring such information that is often unavailable in practice, recent work has applied convex optimization...
In cognitive radio networks, the location information of the primary receiver is critical for underlay spectrum sharing. However, positioning the primary receiver in frequency division duplex (FDD) systems is very challenging. In this paper, we propose a novel method to position the primary receiver using the full-duplex amplified-and-forward (AF) relay technique. Simulation results indicate that...
This paper presents the use of recursive least squares for online estimation of the self interference channel for an In Band Full Duplex communications link without the use of half duplex pilot signals. By using a long effective filter length it is possible to overcome the extra interference of the receieved signal, and it proves to be an effective way to estimate the channel in all scenarios, but...
In this work, we evaluate the performance of Wavelet-Coding into offering robustness for OFDM signals against the combined effects of varying fading and noise bursts. Wavelet-Code enables high diversity gains with a low complex receiver, and, most notably, without compromising the system's spectral efficiency. The results show that the Wavelet-Coded OFDM system achieves a BER of 1E-3 with nearly 6...
In this paper, an optimized codebook design based on rotated angles and extrinsic information transfer (EXIT) chart for a non-orthogonal multiple access scheme, called irregular sparse code multiple access (IrSCMA), is presented. Unlike regular SCMA, in IrSCMA, the defined degree of layer's resource nodes is different, which is beneficial to system performance.It is demonstrated that the new codebook...
Collaborative detection for continuously-varying event-region scenarios using wireless sensor networks (WSNs) has attracted much attention recently. However, most existing works adopt either a centralized approach, in which a powerful control center is used to reconstruct the entire random field, or a semi-centralized approach, in which extensive data exchange takes place among the sensors by means...
The smart phones and their applications add the richness of the VANET applications and increase the requirements on data dissemination support of the networks. This paper focuses on the link reliability model for data dissemination in urban VANETs. First, we extend the analytic model on 1-dimension road to the roads with orthogonal crossings. Then, we verify the link reliability model for the irregularly...
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