Table 1 Parameters for cooperative relay in CRNs

P_RN(dBm)

23

System bandwidth BW(MHz)

10

Number of resource block (RB)

50

Bandwidth of each RB BW_RB (MHz)

0.2

Path loss model from SAP to RN (R : km)

PL_RN(R) = 100.7 + 23.5log₁₀R

Path loss model from RN to SU (R : km)

PL_SU(R) = 103.8 + 20.9log₁₀R

Received noise power NP (dBm)

10log₁₀(kTNFBW)

kT (mW/Hz)

1.3804 × 10^-20 × 290

NF (dB)

5

Distance between inter base station ISD (m)

1,732

Number of SU N_SU

10, 30, 50

Simulation time/sample

100