Resource allocation in multiuser OFDM based cognitive radio systems
Huang Dong · 2010
P total , with I total = 0.02W and P m = 5W in the case of λ = [1 1 1 4]. . . . .5.6 Average total CRU bit rate, R s , versus maximum transmit power budget, P total , with I total = 0.02W and P m = 5W in the case of λ = [1 1 1 8]. . . . .5.7 Average total CRU bit rate, R s , versus maximum transmit power budget, P total , with I total = 0.02W and P m = 5W in the case of ρ = 0.9. . . . . . . .5.8 Average total CRU bit rate, R s , versus maximum transmit power budget, P total , with I total = 0.02W and P m = 5W in the case of ρ = 0.7. . . . . . . .5.9 Average total CRU bit rate, R s , versus maximum interference power, I total , with P total = 25W and P m = 5W in the case of ρ = 0.9. . . . . . . . . . . .5.10 Average total CRU bit rate, R s , versus maximum interference power, P total , with P total = 25W and P m = 5W in the case of ρ = 0.7. . . . . . . . . . . .5.11 Discrete-time Control System Diagram. . . . . . . . . . . . . . . . . . . . .5.12 Equilibrium point of the system. . . . . . . . . . . . . . . . . . . . . . . . .viii 5.13 Expected BER versus required SNR under the case of |H f (t)| 2 = 5 with 4 QAM modulation scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . .5.14 Expected BER versus required SNR under the case of |H f (t)| 2 = 0.6 with 4 QAM modulation scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . .5.15 Expected BER versus required SNR under the case of |H f (t)| 2 = 5 with 64 QAM modulation scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . .5.16 Expected BER versus required SNR under the case of |H f (t)| 2 = 0.6 with 64 QAM modulation scheme. . . . . . . . . . . . . . . . . . . . . . . . . .5.17 Average spectral efficiency comparisons with BER target = 10 -3 for different cases of ρ based on the algorithm proposed in [3]. . . . . . . . . . . . . . .5.18 Average spectral efficiency comparisons with BER target = 10 -3 for different cases of ρ based on the algorithm proposed in [4]. . . . . . . . . . . . . . .5.19 Average spectral efficiency comparisons with BER target = 10 -3 for different cases of ρ. . . . . . . . . . . . . . . . . . . . .