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针对Ka频段OFDM系统中高PAPR以及多普勒频移严重影响数据传输质量的问题,提出了一种将FRFT与PTS相结合的方法。首先将多普勒频移引入Ka频段移动卫星信道模型,然后建立采用联合方法降低PAPR的OFDM系统,并在选取不同环境下系统最优阶次的基础上,通过与其他方法在系统PAPR与误码率性能等方面的比较,验证了FRFT-PTS法的优越性。仿真结果表明,在晴天和轻度阴影,多普勒频移达到300kHz的条件下,当CCDF=10-4时,该方法使系统PAPR0降低约5.5dB,比传统PTS法降低约2dB;在误码率为10-3时,为系统带来约0.5dB的信噪比增益。
Aiming at the problem that high PAPR and Doppler shift in Ka-band OFDM system seriously affect data transmission quality, a method of combining FRFT with PTS is proposed. Firstly, the Doppler frequency shift is introduced into the Ka-band mobile satellite channel model, and then an OFDM system that reduces the PAPR using a joint method is established. On the basis of choosing the optimal order of the systems in different environments, Bit rate performance comparison, verify the superiority of FRFT-PTS method. The simulation results show that the PAPR0 of the system is reduced by about 5.5dB when the CCDF is 10-4 under the conditions of sunny and mild shading with Doppler frequency shift up to 300kHz, which is about 2dB lower than the traditional PTS method. When the code rate is 10-3, it brings about 0.5dB SNR gain to the system.