title page
Abstract
Contents
List of Abbreviations 13
1. Introduction 14
2. Serial concatenation 16
2.1. Overview of serial concatenated codes 16
2.2. Soft-input/soft-output decoding algorithm 16
2.2.1. Component convolutional code and notation 17
2.2.2. MAP algorithm 18
2.2.3. Max-Log-MAP algorithm 19
2.2.4. Log-MAP algorithm 22
2.3. Serial concatenated convolutional codes 23
2.3.1. A serial concatenated encoder 23
2.3.2. Iterative decoding of SCCCs 23
2.4. Iterative detection/decoding schemes(Turbo equalizer with ISI channel) 25
2.4.1. Overview of turbo equalizer with ISI channel 25
2.4.2. System model 26
2.4.3. MAP symbol detection 28
2.4.4. MAP decoding 32
2.4.5. turbo equalization 33
3. Channel coding for DAB 38
3.1. Overview of channel coding system for DAB 38
3.1.1. System model 38
3.1.2. Rate 1/4 convolutional code 39
3.1.3. π/4 DQPSK modulation 40
3.1.4. Performance of the existing DAB channel coding 41
3.2. Iterative demodulation and decoding algorithm for DAB 42
3.2.1. System model 43
3.2.2. Soft-in/soft-out demapping for π/4 DQPSK 44
3.2.3. MAP decoder for convolutional code 45
3.2.4. Simulation results 45
3.3. Proposed low complexity iterative decoding algorithm for DAB 46
3.3.1. Complexity comparison 48
3.3.2. Simulation results 50
4. Summary and Conclusions 58
[국문요약] 59
References 61
Acknowledgement 64
Curriculum Vitae 65
2.1. The recursive systematic convolutional encoder. 18
2.2. A serial concatenated encoder. 23
2.3. Block diagram of the iterative decoder for serial concatenated encoder. 24
2.4. System configuration. 26
2.5. Encoder of a convolutional code, where each incoming data… 27
2.6. Tapped delay line circuit of the channel model for L=2. 29
2.7. A trellis representation of the channel in Figure 2.6.… 30
2.8. A trellis representation of the convolutional code of Figure 2.5.… 34
2.9. The forward/backward algorithm as a schematic block… 35
2.10. The block diagram of a turbo equalizer… 37
3.1. The block diagram of DAB channel coding. 38
3.2. Convolutional encoder 40
3.3. Signal space diagram of π/4 DQPSK. 41
3.4. The performance of hard decision π/4 DQPSK demodulation… 42
3.5. The block diagram of DAB channel coding using iterative decoding. 43
3.6. Trellis diagram of π/4 DQPSK. 44
3.7. The performance of iterative demapping/decoding algorithm. 46
3.8. The block diagram of the proposed low complexity iterative… 47
3.9. The performance of LMAP (demapper) - LMAP (decoder). 50
3.10. The performance of MLMAP (demapper) - LMAP (decoder). 51
3.11. The performance of Enhanced MLMAP (demapper)… 52
3.12. The performance of LMAP (demapper) - MLMAP (decoder). 53
3.13. The performance of Enhanced LMAP (demapper)… 54
3.14. The performance of MLMAP (demapper) - MLMAP (do-coder). 55
3.15. The performance of the proposed algorithm (Enhanced MLMAP (demapper) - MLMAP (decoder)). 56
3.16. The comparison of performance of LMAP (demapper)… 57