| Summary: | 碩士 === 逢甲大學 === 通訊工程所 === 92 === High data rate and high quality transmission are very important considerations in multimedia wireless communication systems. Among a variety of transmission techniques﹐Orthogonal Frequency Division Multiplexing（OFDM）technique not only fits the characteristic, but also has the ability to overcome the problem of multi-path propagation effectively in the process of high performance transmission. At present, nevertheless, it is still a challenge for the practical implementation of OFDM system. One of the reason is that OFDM system has the high Peak-to-Average Power Ratio（PAPR）and in turn the front-end amplifier will operate in the nonlinear region. Thus, the performance of OFDM system will be seriously degraded.
In this thesis, we first discuss the various PAPR reduction techniques, and provide computer simulations. Although the selective mapping（SLM）among the PAPR reduction techniques is very efficient in reducing PAPR, it would involve high system complexity. To alleviate this problem, we propose the use of complete complementary code to reduce computation complexity in SLM-OFDM systems. We also analyze the effect of PAPR between different code group, and the performance in bit error rate.
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