Table 1 Simulation parameter settings

Coverage radius

10 m

Maximum number of secondary users

4

Fixed transmitting power

10 dBm

Minimum transmitting power

8 dBm

Maximum transmitting power

12 dBm

Noise power

1.4e−014 W

Thin wall penetration loss

5 dB

Thick wall penetration loss

12 dB

Shadow fading

6 dB

Carrier frequency

2 GHz (600MHz)

Channel broadband

180 KHz

Subcarrier broadband

15 KHz

Number of subcarriers per channel

12