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OUTLINE OF THESIS
In Chapter 2, the OFDM concept is introduced and the origin of the PAPR problem associated with an OFDM transmission is presented. Various PAPR reduction methods in the field are discussed, and the drawbacks of these methods are presented.
An offset modulation method is developed in Chapter 3, which does not result in a number of the drawbacks experienced by current methods in the field. A closed-form bandwidth occupancy expression and BER expression for an OM-OFDM transmission is derived. Thereafter a newly applied power performance decision metric is introduced. This metric can be utilised throughout the PAPR field to compare various PAPR methods.
The proposed OM-OFDM method may appear to be similar if not identical to a wellknown constant envelope OFDM phase modulation (CE-OFDM) method. In Chapter 4, the significant modulation and structural differences between an OM-OFDM and a CE-OFDM method are discussed. The OM-OFDM, OFDM and CE-OFDM methods are compared by using a BER analysis and the newly applied decision metric.
In Chapter 5, the proposed OM-OFDM method is compared to OFDM, as well as various other PAPR reduction methods, by utilising a power performance decision metric and a complementary cumulative distribution function, after which conclusions are drawn.
CHAPTER 1 Introduction
1.1 BACKGROUND AND MOTIVATION
1.2 AUTHOR’S CONTRIBUTION AND OUTPUTS
1.2.1 Research contributions
1.2.2 Patents
1.2.3 Publications
1.3 OUTLINE OF THESIS
CHAPTER 2 Orthogonal frequency division multiplexing
2.1 INTRODUCTION TO OFDM
2.2 OFDM TRANSMITTER
2.3 OFDM TRANSMISSION
2.4 OFDM RECEIVER
2.5 BRIEF HISTORY of OFDM
2.6 PEAK-TO-AVERAGE POWER RATIO
2.7 PEAK ENVELOPE POWER
2.8 A LITERATURE REVIEW OF VARIOUS PAPR METHODS
2.8.1 Clipping
2.8.2 Coding
2.8.3 Partial transmitted sequence
2.8.4 Selective mapping
2.8.5 Companding
2.8.6 Active constellation extension
2.8.8 Constant envelope OFDM phase modulation
2.9 CONCLUDING REMARKS
CHAPTER 3 Offset modulation
3.1 INTRODUCTION
3.2 OFFSET MODULATION
3.3 BANDWIDTH OCCUPANCY OF OFFSET MODULATION
3.4 SYMBOL AND BIT ERROR RATE CHARACTERISTICS OF OFFSET MODULATIO
3.4.1 A 4-PAM symbol and bit error rate derivation
3.4.2 A 4-QAM symbol and bit error rate derivation
3.4.3 A 16-QAM symbol and bit error rate derivation
3.4.4 M-ary QAM symbol and bit error rate derivation
3.4.5 M-ary PSK symbol and bit error rate derivation
3.5 OM-OFDM PARAMETER SELECTION
3.6 VALIDATION OF THE DERIVATION
3.7 DECISION METRIC
3.8 CONCLUDING REMARKS
CHAPTER 4 Comparison of OM-OFDM and CE-OFDM
4.1 INTRODUCTION
4.2 STRUCTURAL COMPARISON
4.3 BANDWIDTH COMPARISON
4.4 RESULTS AND DISCUSSION
4.5 CONCLUSIONS
CHAPTER 5 Offset modulation results and discussion
CHAPTER 6 Hybrid OM-ACE transmission
CHAPTER 7 A cognitive radio application of OM-OFDM
CHAPTER 8 Conclusion
APPENDIX Modulator and demodulator structure
