Table 1 Nomenclature
From: Analysis of transmit power setting technique for cognitive radio networks
General | |
MATP | Maximum allowable transmit power |
CTP | Constraint target probability |
RSS | Received signal strength |
PB, PN, SB, SN | Primary base station, primary network, secondary |
base station, secondary network | |
B | Bandwidth for PN operation |
P C | Constraint probability in (4) |
\(\dot {\mathrm {P}}_{\text {C}}\) | Constraint target probability (CTP) |
(Z) | Type of MATP such as MATP-Z where Z is P, |
C, or I | |
μ and ν | Mean and variance |
C down | Downlink capacity for SN |
\(\bar {C}_{\text {down}}\) | Average downlink capacity for SN |
Location and distance | |
r c,p | Radius of coverage of the PN |
r c,s | Radius of coverage of the SN |
d | Distance from PB |
Δ d g | Additional separation radius |
d g | =r c,p +Δ d g : radius of extended PN coverage |
\(d_{\text {PU}-\text {SU}_{n}}\phantom {\dot {i}\!}\) | Distance between the PB and the SU n |
\(d_{\text {SU}_{0}}\phantom {\dot {i}\!}\) | Distance between the PB and the SB |
\(\hat {d}_{\text {SU}_{0}}^{(Z)}\phantom {\dot {i}\!}\) | Estimated \(d_{\text {SU}_{0}}\phantom {\dot {i}\!}\) |
d m (or \(d_{\mathrm {m}}^{(Z)}\)) | Transmit decision margin |
Transmission, propagation, and reception | |
\({T}_{\text {PU}_{0}}\phantom {\dot {i}\!}\) | Transmit power of the PB in dB |
\({T}_{\text {SU}_{0}}\phantom {\dot {i}\!}\) | Transmit power of the SB in dB |
\(T_{\text {SU}_{0}, \text {max}}^{(Z)}\phantom {\dot {i}\!}\) | MATP |
T m (or \(T_{\mathrm {m}}^{(Z)}\)) | Transmit power margin |
D T | Binary transmit decision variable (0 or 1) |
L(d) | Path loss |
\(X_{\text {PU}_{0} \rightarrow \text {SU}_{n}, \sigma _{x}}\phantom {\dot {i}\!}\) | Attenuation due to shadowing in the link |
between PU0 and SU n | |
\({\sigma _{x}^{2}}\) | Variance of log-normal shadowing model |
\({R}_{\text {PU}_{0} \rightarrow \text {SU}_{n}}\phantom {\dot {i}\!}\) | RSS level from the PB transmission at SU n |
\(\bar {R}_{\text {PU}_{0} \rightarrow \text {SU}_{n}}\phantom {\dot {i}\!}\) | RSS level without the shadowing effect |
\(\hat {R}^{(Z)}\) | Estimated \(\bar {R}_{\text {PU}_{0} \rightarrow \text {SU}_{0}}\phantom {\dot {i}\!}\) |
I PU | Interference level at the PU receiver at the edge |
of PN coverage | |
\(\bar {I}_{\text {PU}}\) | Interference level without the shadowing effect |
I th | Allowable interference level at the PU |
PU and SU | |
PU0 | PB |
SU0 | SB |
SU n (n=1,â‹Ż,N s ) | nth SU terminal |
N s | Number of SU terminals |