영문목차
Title page=0,1,4
CONTENTS=0,5,2
LIST OF FIGURES=0,7,1
LIST OF TABLES=0,8,1
ABSTRACT=1,9,2
I. INTRODUCTION=3,11,3
II. THE OVERVIEW OF COGNITIVE RADIO TECHNOLOGY=6,14,1
2.1 Concept of Cognitive Radio=6,14,3
2.2 Multicarrier System for Cognitive Radio=9,17,2
III. THE PROPOSED CR-OFDM SYSTEM=11,19,1
3.1 Cognitive Radio Environment=11,19,3
3.2 The CR-OFDM System=14,22,1
3.2.1 Transmitter of the CR-OFDM System=14,22,6
3.2.2 Receiver of the CR-OFDM System=20,28,2
IV. ADAPTIVE FREQUENCY/TIME SPREADING AND POWER CONTROL SCHEME=22,30,2
4.1 Adaptive Frequency Spreading Scheme=24,32,2
4.2/(4.3) Adaptive Time Spreading and Power control Scheme=26,34,2
V. COMPUTER SIMULATIONS=28,36,1
4.1 Performance of the Adaptive Frequency Spreading scheme=28,36,9
4.2 Performance of the Time spreading and power control scheme=37,45,2
VI. CONCLUSION=39,47,1
VII. REFERENCES=40,48,2
Figure2.1 A snapshot of the spectrum utilization up to 6GHz in urban area=6,14,1
Figure3.1 The ACI from primary user in the CR environment=11,19,1
Figure3.2 The ACI from secondary user in the CR environment=12,20,1
Figure3.3 Transmitter of the CR-OFDM system=15,23,1
Figure3.4 Receiver of the CR-OFDM system=20,28,1
Figure4.1 Operational protocol in the Cognitive Radio System=22,30,1
Figure4.2 CINR in secondary user's spectrum=24,32,1
Figure4.3 Stepwise power reduction and time spreading structure=26,34,1
Figure5.1 CINR considered in simulation (SNR=15dB)=29,37,1
Figure5.2 Comparison of the BER in the presence of ACI from primary users=31,39,1
Figure5.3 Comparison of the BER under various the target SINR thresholds in the CR-OFDM system=34,42,1
Figure5.4 Throughput vs. Target SINR threshold in the CR-OFDM system=35,43,1
Figure5.5 Comparison of the BER under with/without Convolutional Code(CC) at K=7, code rate=1/2, generator polynomial (171, 133)=36,44,1
Figure5.6 Comparison of interference coverage from secondary user=38,46,1
Table1 System parameters I=28,36,1
Table2 Throughput Comparison (SNR=15dB)=32,40,1
Table3 System Parameters II=37,45,1