OrthogonalLTEtwo-tierCellular方案.PDFVIP

1 Orthogonal LTE two-tier Cellular Networks ´ Leonardo S. Cardoso , Marco Maso , Mari Kobayashi and Merouane Debbah ´ Alcatel-Lucent Chair - SUPELEC, Gif-sur-Yvette, France Department of Information Engineering, University of Padova, Italy leonardo.cardoso, marco.maso, mari.kobayashi, merouane.debbah@supelec.fr Abstract—In previous works, Vandermonde-subspace fre- Nevertheless performing a correct detection of the spectrum quency division multiplexing (VFDM) has been shown to promote holes can be difficult due to the presence of fading [6] and overlay networks by enabling a secondary transmitter to cancel to the need to process multi-gigahertz wide bandwidth to its interference to a primary receiver, while simultaneously transmitting useful information to its own receiver at non- reliably detect presence of primary transmitters [7], imposing negligible rates. Interference cancelation is achieved by exploiting severe constraints to the sensitivity and linearity of the RF the null-space of the channel from the secondary transmitter circuitry. A suggested approach to overcome this issue is a to the primary receiver. In the wake of a global deployment technique called collaborative spectrum sensing but it relies of the third generation partnership project’s (3GPP) long term on a complex signaling