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Based on the concept of reconfigurable antennas (RAs), SSK-RA has been recently proposed as a novel transmission scheme to improve the performance of space shift keying (SSK). In this context, it has been shown that RAs' reconfigurable properties can be used as additional degrees of freedom to enhance the throughput, implementation complexity, and error performance of SSK. In this paper, we extend...
Ellipticity statistic (EP) is a measure of multipath richness in MIMO channels that provides spatial multiplexing for their wireless systems. EP is as the ratio of the geometric mean and arithmetic mean of eigenvalues of MIMO channels. It measures the degradation of of mutual information (MI) from the ideal scenario . This work investigates the variability of EP as a function of antenna orientation...
In this paper, we investigate the impact of using outdated channel state information for incremental opportunistic relay selection in a spectrum sharing cognitive network. In our work, we present the outage performance of two schemes where the power allocation is based on the instantaneous outdated channel state information and the statistical knowledge of the interference links, referred to as CSI-based...
This work presents the impact of reconfigurable antenna on radio channel characteristics of IEEE 802.11ac system, which is the next evolution of Wi-Fi systems. Reconfigurable antennas (RA) can be used to change radio channel characteristics in favor of receiver design. The results show that RA can be used to reduce power of some of the delay clusters, which lead to minimizing excess delays of these...
In this paper, we study applying dual branch transmit switch-and-stay combining (SSC) technique for underlay cognitive radio (UCR) networks. In UCR, the secondary user is allowed to share the spectrum with the primary (licensed) user under the condition that interference at the primary receiver is below a predetermined threshold. Assuming binary phase-shift keying (BPSK) modulation and Rayleigh fading...
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