CAJ | 학술논문

正交频分复用(OFDM)技术是现在4G通信和即将到来的5G中的关键技术。对其信道进行估计的准确性直接影响到系统的误码率(bit error rate BER)。文章提出了一种新自适应分块错位和周期性的导频插入模式。此模式能更准确地估计OFDM的各子信道状况。其利用线性插值法估计出未插入导频信号的子信道上的频率响应。仿真结果显示，所提出的方法能在同样的误码率要求时，大幅度地减少发送端的发送功率（信噪比增益在4dB以上）。
정교빈분복용(OFDM)기술시현재4G통신화즉장도래적5G중적관건기술。대기신도진행고계적준학성직접영향도계통적오마솔(bit error rate BER)。문장제출료일충신자괄응분괴착위화주기성적도빈삽입모식。차모식능경준학지고계OFDM적각자신도상황。기이용선성삽치법고계출미삽입도빈신호적자신도상적빈솔향응。방진결과현시，소제출적방법능재동양적오마솔요구시，대폭도지감소발송단적발송공솔（신조비증익재4dB이상）。
The OFDM is the key technology in the 4G and the upcoming 5G communication systems. The accurate estimation of the channel conditions has a direct influence on the bit error rate of the systems. This paper proposes a new adaptive and periodic pilot sub-channel insertion method. This method can estimate the sub-channels' state of the OFDM in a more accurate way, and the frequency responses of the non-pilot sub-channels are estimated by the method of linear interpolation. Simulation results have demonstrated that the proposed method can greatly reduce the transmission power under the same bit error rate requirement(The SNR gain is more than 4dB).