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We present broadband 8×6 MIMO channel measurements in an industrial production environment. Motivated by the observation of sudden fades with 10–20 dB due to slight rotations/translational movements and thus line-of-sight blockage, antenna diversity schemes are evaluated in transmission experiments for increased robustness.
In this paper, the cellular mobile communication system with microdiversity and macrodiversity reception operating over Gamma shadowed Weibull multipath fading environment is analyzed. Macrodiversity selection combining (SC) receiver reduces Gamma long term fading effects and three microdiversity SC receivers mitigate Weibull short term fading effects on the system performance. The useful closed form...
Introducing compressive sensing theory to solve multiple targets localization problem is a promising method by only considering received signal's power. In previous researches, the targets are assumed to be positioned into an regular mesh grid and restoration model according to compressive underdetermined equation is built to recover the positions of unknown targets. However, it is inconvenient to...
RF energy harvesting (RFEH) is a promising technology for energy requirements of wireless communication nodes. However, providing sufficient amount of energy to ensure self-sufficient devices based on RFEH may be challenging. In this paper, the use of diversity combining in RFEH systems is proposed to increase the amount of harvested energy. The power consumption of diversity combining process is...
We study amplify-and-forward (AF) relay networks operating with source and relay amplifier distortion, where the distortion dominates the noise power. The diversity order is shown to be 0 for fixed-gain (FG) and 1 for variable-gain (VG) if distortion occurs at the relay; if distortion occurs only at the source, the diversity order will be 1 for both. With εβ = N0/ηβ (N0 the noise power, ηβ the distortion...
While buffer-aided relaying improves the diversity of a multi-hop network, its deployment introduces time-delays, thus rendering buffering unreliable for delay-intolerant applications. To alleviate excessive delays, various studies propose delayaware protocols, but at the expense of reduced diversity, and consequently, increased outage probability. Attempts to maintain the diversity of the system...
A new (Beaulieu-Xie) fading model was recently proposed to describe line-of-sight and non-line-of-sight components in wireless channels. In this work, we consider both outage probability and error rate performance of selective combining over this new fading channel model with arbitrary channel correlation. Closed-form expressions are obtained for asymptotically tight upper and lower bounds. The analytical...
Multiple antennas are used with suitable signaling methods in space time diversity techniques. A significant performance gains are achieved in presence of multipath fading with the use of diversity techniques. The signals on both the transmitter and receiver sides of the antennas are combined in such a way that the BER is improved. In this paper we discussed about diversity techniques to overcome...
The performance of an optical wireless communication (OWC) system subjected to atmospheric turbulence induced fading can be significantly improved by using spatial diversity reception. Diversity reception also suffers from correlation among diversity branches due to insufficient spacing between multiple photodetectors at the receiver. In this paper, average channel capacity of OWC system employing...
Narrowband powerline communications (NB-PLC) and unlicensed wireless communications are considered as two leading communications technologies for emerging Smart Grid applications. The diversity provided by the simultaneous transmission of the same information over powerline and wireless links can be exploited to enhance the overall system reliability. In this paper, we consider differential transmission/detection...
In this paper, a dual hop diversity communication system which is highly confidential for wireless applications is proposed to transmit the secret information from the source to receiver in the presence of interferences. In this proposed wireless communication system, the receiver is equipped with multiple antennas whereas the relays and interference are equipped with single antenna. The output signal...
In this paper, wireless mobile macrodiversity (MaD) system with switch and stay (SSC) receiver and two dual branches microdiversity (MiD) selection combining (SC) structures operating over correlated Gamma shadowed Kappa-Mu (k-μ) multipath fading environment is taken into consideration. Cumulative distribution function (CDF) of MaD SSC receiver output signal is obtained and used for the evaluation...
Industrial Internet of Things (IIoT) requires superior reliability from underlying communication technology that consumer wireless technologies often fail to meet. New physical layer techniques have been proposed to enhance the performance of wireless monitoring and control networks to address this challenge. Utilizing polarization diversity techniques through Rotating Polarization Waves (RPW) have...
High reliability and low latency are key requirements for a number of upcoming use cases and applications in mobile communication networks. In order to address the requirements, we present statistical models which capture the most important radio propagation phenomena, such as path loss, shadowing, and small scale fading. The models enable the evaluation of trade-offs between reliability, achievable...
Macro-diversity (MaD) system with MaD selection combining (SC) receiver and two micro-diversity (MiD) SC structures in the shadowed multipath fading channel in the presence of co-channel interference (CCI) is investigated. The received signal propagates through Gamma shadowed Rayleigh fading channel while CCI propagates through Gamma shadowed Nakagami-m multipath fading channel. Novel, infinite series...
This paper investigates the performance improvement of the receiver for pulse-amplitude-modulated discrete multitone modulation (PAM-DMT) system in intensity modulated direct detected optical channel. In conventional receiver for PAM-DMT, data are only extracted from the imaginary parts of subcarriers while the real parts which contain clipping noise are simply discarded, causing a major loss of the...
This paper mainly focuses on the performance analysis of multiband orthogonal frequency division multiplexing (OFDM) based ultra wideband (UWB) system in the presence of log-normal fading channels. For this, an exact probability density function of sum of squared magnitude of log-normal random variables and squared sum of log-normal random variables are used to derive analytical expressions for outage...
In this paper, we investigate the secrecy performance of dual-hop amplify-and-forward (AF) multi-antenna relaying systems over Rayleigh fading channels by taking into account the direct link between the source and destination. To improve the secrecy performance, two linear processing schemes at relay and maximal ratio combining (MRC) at destination are proposed, namely, Zero-forcing/MRC (ZF/MRC) and...
In this paper, we have investigated the effect of cochannel interference on Decode-and-forward based cooperative communication system by providing the analytical results and computer simulations over Rayleigh fading channels. Virtual noise technique is used with co-channel interference at relay and destination terminals. It can be clearly observed that virtual noise techniques provides full diversity...
In this paper, we introduce the notions of a user-scaling function and a user-scaling exponent and multiuser diversity (UEMD) pair. Our notions for the UEMD pair could be utilized as a basic tool for analyzing user-scaling laws. We derive a secure user-scaling law in terms of SNR, the number of eavesdroppers, the number of distributed antennas in distributed antenna systems, and design parameter λ...
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