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Pilot design plays a key role in the channel estimation of pilot-assisted multiple-input multiple-output (MIMO) systems. Power allocation is a momentous issue in the pilot design. In the literature, pilot power allocation among transmit antennas has not been investigated. This paper explores this issue by introducing discriminatory treatment of different channel parameters. Generally, the large-scale...
Polarization-enabled Spectrum Sharing (PSS) that exploits the spectrum opportunities in polarization domain is deployed to balance between avoiding interference at the incumbent receiver and optimizing the throughput of secondary user. However, when it comes to wideband environments, PSS is impaired by the frequency-dependent Polarization Mode Dispersion (PMD) effect, thus the spectrum efficiency...
With the widespread deployment of LTE 4G systems and large number of connected devices due to the Internet of Things, M2M services using LTE is under consideration by many cellular operators. In LTE Rel-12, low cost M2M devices with material cost comparable to EGPRS devices are being introduced. In addition, coverage enhancement techniques, which would be required to support M2M, will be standardized...
Machine-to-machine communications has emerged to provide autonomic communications for a wide variety of intelligent services and applications. Among different communication technologies available for connecting machines, cellular-based systems have gained more attention as backhaul networks due to ubiquitous coverage and mobility support. The diverse ranges of service requirements as well as machine...
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