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In this paper, we propose novel relay selection policies that aim at reducing the average delay by incorporating the buffer size of the relay nodes into the relay selection process. More specifically, we propose two delay-aware protocols that are based on the max — link relay selection protocol. First, a delay-aware only approach while it reduces the delays considerably it starves the buffers and...
In this paper, Fixed-width Reduced Precision Replica Redundancy Block (RPR) design is adopted in Algorithmic Noise Tolerant (ANT) architecture. The main objective of this design is to achieve High Precision, Low power and high speed multiplier. By using Fixed-width RPR computation error can be identified and corrected. The ANT architecture was implemented using Xilinx and ModelSim tool. Performance...
This paper analyses the outdoor small-cell millimeter-wave (mmW) propagation using ray-based simulation tools. The main characteristics of the wireless channel, i.e. pathloss, delay and angular spreads, are characterized through various small-cell scenarios, and by comparison between several frequency bands. The 2.4 GHz and 5 GHz bands represent the traditional sub-6GHz frequencies in public radio-communication...
Modern wireless systems deal with the adverse and unpredictable channel conditions using two main transmission schemes considered as complimentary: adaptive modulation and coding (AMC) and hybrid ARQ (HARQ). In this work we use the effective capacity as the performance measure to evaluate different design options. We thus show how to calculate this performance measure under independent, identically...
Streaming services come with their own challenges and technical issues that still need to be addressed for satisfying the target quality of experience (QoE) of the end-users in mobile environments. In this paper, we explore the idea of combining users' context information with the packed prefetching process features to enhance users' QoE in heterogeneous networks. More specifically, we propose a scheduling...
At present, 2 to 4 out of every 1000 births are affected with hearing impairments. In enforcing mandatory hearing screening for neonates, robust algorithms are required to make the process fast and efficient. In this paper, we present a novel algorithm to automate objective hearing screening using auditory brainstem response (referred to as ABR). An effective stimulus delivery mechanism, an efficient...
Orthogonal Frequency Division Multiplexing (OFDM) is the multiple access technology for Fourth Generation(4G) communications. Due to its resilience to multipath fading and support for high data rates at minimal complexity, it has an edge over other technologies like Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA). A wireless channel is characterized by multi-path propagation...
The millimeter wave frequencies (roughly above 10 GHz) offer the availability of massive bandwidth to greatly increase the capacity of fifth generation (5G) cellular wireless systems. However, to overcome the high isotropic pathloss at these frequencies, highly directional transmissions will be required at both the base station (BS) and the mobile user equipment (UE) to establish sufficient link budget...
This paper presents a low-cost, low-complexity FMCW-based ultra-wideband (UWB) chipless time domain reflectometry (TDR) radio frequency identification (RFID) system, which is suitable for implementing higher order modulation schemes. Higher order modulation significantly increases the information content in chipless RFID. The applicability of phase-shift keying (PSK) and pulse-position modulation...
Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is the basis technology for digital television standard (DTV) employed in some countries thanks to its high spectral efficiency when compared to traditional cyclic prefix OFDM. Moreover, it does not require pilot usage in frequency domain channel estimation. Instead of data usage as cyclic prefix, pseudo-noise (PN) sequences...
Continuous-time delta-sigma modulators (CT-DSMs) are well suited for the baseband ADC of an LTE-A receiver. To boost user throughput and increase network capacity, CT-DSMs will need to increase signal bandwidth (BW) while maintaining sufficient dynamic range (DR) and good power efficiency. For example, 5 downlink component carriers are no longer sufficient to meet the ITU requirement for IMT-advanced...
Long Term Evolution (LTE) holds the promise to enhance the capacity and speed of mobile communication by supporting Multimedia Broadcast/Multicast Services (MBMS) over a single frequency network (MBSFN), where numerous cells transmit an identical waveform that is synchronized in time for a specific time interval. For improving the performance of SFN, ultra-extended cyclic prefix duration has been...
This paper analyses the performance of an underlay cognitive radio network (CRN) over α-μ fading channels in terms of symbol error probability (SEP) and effective capacity (EC). The α-μ distribution allows for a more general fading model with an increased level of generality compared to well-known models such as Nakagami-m and Rayleigh fading. The SEP and EC at the secondary user receiver are therefore...
Smallcells can provide high-quality radio coverage in indoor environment. However, resource management and interference mitigation are key challenges, resulting from the heterogeneous backhaul and the uncoordinated nature of smallcells. We propose a new game theoretic approach, where the transmit power of smallcells evolve in a distributed manner, adapting to traffic demands and mitigating interference...
With the design of data communications in mind, 3GPP Long Term Evolution (LTE) mobile network is now considered as the most promising technology for Internet of EveryThings (IoE). The IoE incorporates four pillars: people, process, data, and things. The pillars interact in a way that establishes three main connections in the IoE environment: people communicate with people (P2P), machines communicate...
The instinct characteristics and advantages of low earth orbit (LEO) communications satellites have made LEO satellite communication an important trend in the future communications. For such a communication system, inter-satellite link is an essential part. However, due to its time-variant nature caused by e.g., light-of-sight (LOS) effect, Doppler frequency shift and noise, the data transmission...
Energy efficient routing protocol design in the presence of noise and interference is a challenging task in wireless sensor networks (WSNs). In this paper, we present a robust, energy efficient multi-path routing protocol that uses the residual energy and Signal-to-Noise Ratio (SNR) to predict the best next hop node during the route establishment. The new protocol uses multi-path to transmit the data...
IEEE-802.11 standard, as the dominant wireless technology, has extended its usage to Industrial Networks. Various physical layer modulation schemes have been defined in the standard, but only the simplest ones, like DBPSK, has been thoroughly studied in the literature. OFDM on the other hand, has proven performance in fading channels, which is a common phenomenon in noisy industrial environment. In...
Smart grids are networks composed of several interconnected layers. The lowest layer consists of the Home Area Network (HAN), in which a set of Electrical Devices (EDs) communicate with a mesh client. This client then communicates with the mesh router of the wireless mesh network. EDs generate critical information packets, and these must be passed to a control station with minimal delay. In this paper,...
In this paper, we investigate the impact of feedback delay and channel estimation error (CEE) on the performance of wireless multi-user decode-and-forward (DF) relay systems in independent and non identically distributed Rayleigh fading channels. To assess the performance, we derive the exact probability density function (PDF) expression of the signal-to-noise ratio (SNR) for each link, and the average...
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