title page
Contents
ABSTRACT 10
I. INTRODUCTION 12
II. OVERVIEW OF MC-CDMA SYSTEM 17
A. Multi-carrier Modulated CDMA system 17
B. Transmitter 19
C. Channel Model 20
D. Receiver 22
III. INTERFERENCE CANCELLATION IN MC-CDMA SYSTEM 25
A. Serial Interference Cancellation 26
B. Parallel Interference Cancellation 30
C. Iterative Methods 32
1. Jacobi's Method 32
2. Gaussian-Seidel Method 33
3. Successive Overrelaxation (SOR) Method 35
D. The effect of channel estimation error on the BER performance 36
E. Hybrid Interference Cancellation in MC-CDMA system 38
F. Hybrid Interference Cancellation with the Conventional Clustering Algorithms 41
IV. PROPOSED MAI CANCELLATION SCHEME 44
A. Proposed Clustering Algorithm for HIC in MC-CDMA system 44
V. COMPUTER SIMULATION 52
A. Performance of the PIC and SIC scheme 55
B. Performance of HIC with the proposed scheme 57
1. Performance of HIC under the perfect channel estimation 57
2. Performance of HIC under channel estimation error 66
VI. CONCLUSION 69
VII. REFERENCES 71
요약 73
감사의 글 74
Table 5.1. Indoor Channel Model 53
Table 5.2. System parameters 54
Figure 2.1. The comparison of the three multiple access schemes 18
Figure 2.2. MC-CDMA transmitter 20
Figure 2.3. MC-CDMA receiver for the kth user(이미지참조) 22
Figure 2.4. Block diagram of the transmitter and Channel for multiple users in the uplink MC-CDMA 24
Figure 2.5. Block diagram of the receiver for the kth user in the uplink MC-CDMA(이미지참조) 24
Figure 3.1. The operation of SIC scheme for the kth user(이미지참조) 27
Figure 3.2. Multi-stage PIC 31
Figure 3.3. An iterative structure using Jacobi's method 33
Figure 3.4. An iterative structure using Guass-Seidel method 34
Figure 3.5. An iterative structure using SOR method 36
Figure 3.6. A hybrid interference canceller with unequal number of users in each cluster 40
Figure 4.1. The order of the clustering process in the HIC process 45
Figure 4.2. The description of the proposed clustering algorithm 51
Figure 5.1. The BER performances of the conventional PIC and SIC… 56
Figure 5.2. The performance comparison between the functions used in the proposed clustering… 60
Figure 5.3. The comparison of BER performance between the proposed HIC and… 61
Figure 5.4. The comparison of BER performance between the proposed HIC and… 62
Figure 5.5. The comparison of BER performance between the proposed HIC and… 63
Figure 5.6. The BER comparison of the conventional algorithm and the proposed clustering… 64
Figure 5.7. The BER performances of the clustering algorithms with respect to the number of… 65
Figure 5.8. The performance comparison between the proposed and the conventional clustering… 67