摘要
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。
A new scheme combining FRFT with PTS was proposed to address the severe effect of Doppler shift and high PAPR of OFDM system in Ka-band on data transmission quality.Doppler shift was introduced into mobile satellite channel model in Ka-band,and an OFDM system was established,of which the PAPR was reduced using union method.Based on the optimal order of the system under different conditions,a comparison was made on PAPR and BER performance between different methods.Advantages of the FRFT-PTS method were demonstrated.Simulation results showed that,when CCDF=10-4,PAPR0 of the system was reduced by 5.5 dB in clear sky and light shadowing for a Doppler shift of 300 kHz,2 dB lower than that using traditional PTS method,and when BER=10-3,SNR of the system was improved by 0.5 dB.
出处
《微电子学》
CAS
CSCD
北大核心
2012年第5期697-701,共5页
Microelectronics
基金
国家自然科学基金资助项目(60972042)
陕西省自然科学基金资助项目(2009JM8001-3)
