一种改进的无边带信息PTS-OFDM系统

An Improved PTS-OFDM System without Side Information

部分传输序列(PTS)技术是减小OFDM信号峰均比的一种有效技术,具有无失真,性能优越的特点,但存在计算复杂度高以及需要传输边带信息(SI)的缺点,会增加系统开销,降低有效数据传输率。本文提出了一种无需单独传输SI信息的PTS优化方案,给出了实现方案及系统控制策略,并对该系统的峰平比和误码率性能进行了Matlab仿真和分析。结果表明,提出的PTS方案在不降低系统数据率的情况下可以有效改善OFDM信号的峰均比特性以及系统BER性能,且不受调制方式影响。

The Partial Transmit Sequences(PTS) approach is an efficient technology to reduce PAPR of OFDM signal with advantages of no distortion and good performance.High computational complexity and needful side information(SI) are the main drawbacks of PTS,explicit SI is used to inform receiver the weighting factor selected by the transmitter.Generally the SI is transmitted in the subcarriers as efficient data,so the efficient data-rate will be decreased.An optimized PTS scheme without additional explicit SI is proposed in this paper,the algorithm and system control scheme are also presented.The effects of proposed PTS on the performance of PAPR and BER of OFDM system were analyzed through MATLAB simulation.The simulation results show that the presented PTS scheme can improve the performance of OFDM system including the PAPR and bit error rate without data-rate loss due to the transmission of additional information.Also,the proposed method can be easily realized for all kinds of digital modulation formats in the OFDM communication system.