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Smart grids are comprised of several interconnected layers of networks. A set of Electrical Devices (EDs) in the lowest layer, the Home Area Network (HAN), communicates with the Mesh Client (MC). The HAN, in this paper, is modelled as a wireless network using Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA) to facilitate communication between the EDs and their respective...
We instigate the questions of: (i) whether increasing the number of available channels is always useful for improving the Quality of Service (QoS) (i.e., throughput or packet delivering delay) of Wireless Mesh Networks (WMNs), (ii) whether using more complex algorithms for managing Partially Overlapping Channels (POCs) is beneficial in terms of improving the QoS of WMNs? For the purpose of the instigation,...
In this paper, we study the outage probability of the amplify-and-forward (AF) cognitive relaying in spectrumsharing environments with outdated channel state information (CSI) over Rayleigh fading channels. A selection of the best relay in the secondary system with outdated channel information is considered. We derive a closed-form expression for the tight lower bound on the end-to-end outage probability...
This paper provides indications and simulative performance evaluations of how a wireless system can profit from being able to support various subcarrier spacings concurrently. We show that with using this degree of freedom high Doppler, low latency and extended coverage scenarios are improved. In our investigations we consider different options for multi-carrier numerology, frame design and pilot...
This paper presents new system-level design for the cognitive sensor based on energy detection to boast the performance accuracy by maintaining a queue of energy samples and computing their average to determine the decision threshold. Thereafter, these values summed over average number of samples are again compared with the recent energy value to decide whether the spectrum is occupied or unoccupied...
In frequency duplex division systems, it is very challenging to position the receiver (Rx) that belongs to the third-party system since the anchors usually do not know which frequency band the Rx uses for transmission. As a result, they can only use the received signal from the third-party transmitter (Tx) to position the Rx. In this paper, we propose a relay-based positioning method to estimate the...
In this article, we investigate the average transmission delay performance for the distributed multiple access cooperative communication systems with splitting opportunistic relay selection in the presence of strong co-channel interference (CCI). We consider a distributed wireless network with random access and analyze the impact of imperfect channel state information (CSI) due to CCI on latency....
This paper presents a Delay-Locked-Loop (DLL) using a low-jitter design technique to generate sub-picosecond-jitter interleaved ADC sampling clock phases. To mitigate the effects of jitter accumulation, a low jitter delay line with digital control circuit is proposed. After 10 delay stages, the proposed DLL output can achieve <0.1psrms jitter clock. The DLL can operate with input clock frequency...
In this paper, we present a new method for neural spike sorting based on Continuous Time (CT) signal processing. A set of CT based features are proposed and extracted from CT sampled pulses, and a complete event-driven spike sorting algorithm that performs classification based on these features is developed. Compared to conventional methods for spike sorting, the hardware implementation of the proposed...
A deep understanding of the queuing performance of wireless networks is essential for the advancement of future wireless communications. The stochastic nature of wireless channels in general gives rise to a time varying transmission rate. In such an environment, interference is increasingly becoming a key constraint. Obtaining an expressive model for offered service of such channels has major implications...
In this paper, we propose a novel relay selection policy based on the Hybrid Relay Selection (HRS) relay selection protocol that takes into account the state of the buffers and aims at reducing the average packet delays in the network. The proposed protocol, called the Delay-Aware HRS (DA — HRS) protocol is analyzed by means of Markov Chains and expressions for the outage probability, throughput and...
In this paper, a two-stage phase-increment-based frequency estimator with a general pilot-symbol-assisted- modulation (PSAM) structure is proposed for burst-mode communications. We derive the true Cramer-Rao bounds (CRBs) under the general PSAM structure for pure data-aided (DA) estimator. The proposed phase increment-based estimator is a pure DA estimator and implemented via two stages. In the first...
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...
This paper proposes a novel method, called in-band delay and cancellation digitization (IBDCD), to release the requirement for high-capacity analog cancellation by breaking the bottleneck of digital cancellation capacity. In full-duplex radios, the capacity of digital cancellation is bounded by the dynamic range of analog-to-digital converter (ADC), which can be improved by the proposed IBDCD scheme...
In this paper, we propose methods to enable efficient data delivery in vehicular ad-hoc networks (VANETs). We target scenarios where data are collected by vehicles and need to be transmitted. Dynamic clusters are formed while vehicles move in order to make data transmissions more robust and scalable. We use mathematical optimization solutions to optimize transmission scheduling so as to maximize throughput...
Accurate classification or recognition of phase modulated radar waveforms, typically accomplished via the combination of pulse parameter estimates and matched filtering, poses a simple problem in ideal conditions. In less than ideal conditions, carrier frequency, time offset, pulse amplitude, initial phase, and bandwidth are unknown to the electronic warfare (EW) receiver rendering the application...
Several studies assert that the random access procedure of the Long Term Evolution (LTE) cellular standard may not be effective whenever a massive number of simultaneous connection attempts are performed by terminals, as may happen in a typical Internet of Things or Smart City scenario. Nevertheless, simulation studies in real deployment scenarios are missing because many system-level simulators do...
In this paper, statistical Quality of Service provisioning in next generation heterogeneous mobile cellular networks is investigated. To this aim, any active entity of the cellular network is regarded as a queuing system, whose statistical QoS requirements depend on the specific application. In this context, by quantifying the performance in terms of effective capacity, we introduce a lower bound...
In frequency division duplex (FDD) two-tier networks, the probing technique has recently been introduced into the cross-channel gain estimation, which requires the tier-two user to act as a relay for the tier-one user. Then the tier-two user can autonomously estimate the cross-channel gain. However, the improper location of the tier-two user, i.e., the relay, may cause severe interference to the tier-one...
The Tactile Internet will be able to transport touch and actuation in real-time. The primary application running over the Tactile Internet will be haptic communications. Design efforts for both the Tactile Internet and the haptic communications are at a nascent stage. It is expected that the next generation (5G) wireless networks will play a key role in realizing the Tactile Internet. On the other...
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