5G候选波形Filtered-OFDM技术研究与分析

Analysis on Filtered-OFDM Technology for 5G Candidate Waveform

在对4G系统OFDM技术分析的基础上,针对5G候选波形Filtered-OFDM技术的特点,研究了2个子带情况下的系统性能。仿真结果表明,Filtered-OFDM系统的带外泄露比OFDM系统约低40 d B;当滤波器长度更长时,系统能获得较低的误码率,但滤波器设计更加复杂;保护间隔越大,两个子带数据的干扰越小,同时浪费了更多的频谱资源;调制阶数越高,误码率越高。在实际设计中,应该综合考虑这些因素的影响。

Based on the analysis of OFDM technology for 4G system and characteristics of 5G candidate waveform Filtered-OFDM technology, the system performance of Filtered-OFDM with two sub-bands is explored. Simulation results indicates that the out-of-band emission of Filtered-OFDM system is improved by 40dB as compared with that of OFDM system. When the filter length is longer, the Filter-OFDM system can acquire a lower bit error rate, and however, filter becomes more complex in design. Meanwhile, the lager the guard-tone is, the smaller the interference of data in the two sub-bands would be. At the same time, more spectrum resources are wasted. In addition, when there is a higher modulation order, the bit error rate would go high. The influence of these factors should be comprehensively considered in practical design.