Research On Technology Of PAPR Reduction In OFDM Signals

The principle of OFDM and the key technology of a practicality OFDM system are briefly discussed.Then the concept and the statistical properties of Peak-to-Average Power Ratio (PAPR) in OFDM system are studied. Most of PAPR reduction techniques in the literature are also being analyzed and realized. Then the thesis focuses on Partial Transmit Sequence(PTS) algorithms. The principle of PTS are being discussed in detail. The factor which affects the performance of PTS is analyzed and the PTS algorithms is realized in the thesis. The problem of the complexity of PTS is discussed and the reasons of the complexity are analysed. Finally, on the basis of analysis above, two different improved PTS algorithms by using T Conversion and Zadoff-Chu sequence to reduce the complexity of PTS are discussed and implemented, is shown by simulation that, compare with the original PTS algorithm, the performance of improved PTS algorithm is almost the same, but the amount of calculation is reduced significantly.