Neiyer S. Correal

Device-to-device discovery based on 3GPP system level simulations

Device-to-device (D2D) communication as an underlay to cellular networks has gained increasing popularity as a technology component to LTE-Advanced. Through D2D communications, user equipments (UEs) in close proximity to each other, may communicate directly instead of through the eNodeB. This helps to achieve better performance than that offered via eNodeB (two-hops) by offloading eNodeB resources, and enables new types of services. This paper provides an overview of the new agreements in 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Radio Access Networks (RAN) related to evaluation methodology and channel modeling for D2D discovery and communications. We also present a system level simulation environment based on 3GPP assumptions and a performance evaluation of three different D2D discovery algorithms.

A multitaper hardware core for spectrum sensing

We have implemented a non-iterative multitaper sensing hardware core. The multitaper core computes the spectrum as the average of M eigenspectra calculated using Slepian sequences. While more computationally complex than traditional Fourier methods, the multitaper estimation method offers enhanced performance. The working multitaper hardware core was validated on FPGA using over the air RF measurements in the UHF T-Band. The multitaper core has been incorporated into a prototype frequency agile spectrum sensing platform.