| Summary: | 博士 === 大同大學 === 通訊工程研究所 === 95 === Orthogonal frequency division multiplexing（OFDM）has received significant attention in various applications, not only for its robustness against the multi-path interference, but also for its high bandwidth efficiency. A large peak-to-average power ratio (PAPR) of OFDM system incurs problems such as decreasing the efficiency of output power. Many researchers have proposed algorithms, such as peak clipping, coding techniques and scrambling techniques. There inherent it unique limitation for each solution. The work presents novel combinative algorithms, based on combining block coding with parity checking and Discrete Cosine Transform (DCT), to reduce the PAPR of OFDM communication systems and the output of OFDM signals with strong robustness of noise immunity and error correction.
A simulation model is established to verify the effectiveness of the proposed algorithms. Simulation results indicate that PAPR can be reduced to 9.4419dB. These novel algorithms reveal that the proposed algorithm is much simpler than other proposed algorithms. In particular, the proposed model does not need to transmit side information between the transmitter and receiver. Our results further demonstrate that either combining block coding with parity checking and DCT or integrating two algorithms can cause a further reduction in the PAPR. Furthermore, an accumulative effect occurs between these two proposed algorithms.
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