Table 1 List of notations
From: Uplink achievable rate in underlay random access OFDM-based cognitive radio networks
Notation | Definition |
|---|---|
Φ P | β-GPP with repulsion parameter β and intensity λP which represents the locations of PBSs |
Φ S | PPP with intensity λS which represents the locations of SBSs |
\(\Phi _{P}^{(u)}(\Phi _{S}^{(u)})\) | PPP with intensity \(\lambda _{P}^{(u)} (\lambda _{S}^{(u)})\) which represents the locations of PUs (SUs) |
N | Number of available subcarriers |
NP(NS) | Number of subcarriers for each PU (SU) |
τ | Pre-defined interference threshold at PBSs |
αP(αS) | Path loss exponent for channels between users and PBSs (SBSs) |
P S, x | Transmit power at the SU at x |
P P | Transmit power at the PUs |
hx,i(gx,i) | Power of small-scale fading channel between the tagged SBS and the SU (PU) at x for the ith subcarrier |
σ 2 | Power of additive white Gaussian noise (AWGN) |
γ i | Signal-to-interference-plus-noise ratio (SINR) for the ith subcarrier |
C | Instantaneous SU achievable rate |
\(\hat {C}\) | Average SU achievable rate |