Table 1 A summary of abbreviations, notations, and symbols
From: Spectrum sharing on interference channels with a cognitive relay
SIC | Successive interference cancellation |
|---|---|
IFC-CR | Interference channel with a cognitive relay |
DPC | Dirty paper coding |
AF/DF | Amplify-and-forward/decode-and-forward |
PT/PR | Primary transmitter/primary receiver |
ST/SR | Secondary transmitter/secondary receiver |
MRC | Maximal-ratio combining |
AWGN | Additive white Gaussian noise |
x p | Signal transmitted from PT |
x s | Signal transmitted from ST |
x r | Signal transmitted from CR |
y p | Signal received at PR |
y s | Signal received at SR |
y r | Signal received at CR |
n 0 | AWGN that is with unitary variance |
h ij | Channel coefficient of link i→j |
γ ij =|h ij |2 | Channel power gain of link i→j |
exp(δ) | An exponential distribution with mean δ −1 |
P P | Transmit power at PT |
P S | Transmit power at ST |
P R | Transmit power at CR |
R pt | Target rate at PT |
R st | Target rate at ST |
\(\mathcal {E}\), \(\overline {\mathcal {E}}\) | An event and its complementary event |
\(\Pr \{\mathcal {E}\}\) | Probability of event \(\mathcal {E}\) |
O P | End-to-end outage probability of the primary system |
O S | End-to-end outage probability of the secondary system |
α | Power allocation factor at CR |
θ | Ratio between P S and P P |
Ï„ | Ratio between \(\delta _{\textit {sr}}^{-1}\) and \(\delta _{\textit {pr}}^{-1}\) |
φ | Ratio between \(\delta _{\textit {sp}}^{-1}\) and \(\delta _{\textit {pp}}^{-1}\) |