摘要
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4d B以上)。
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 4d B）.
出处
《计算机时代》
2015年第9期17-18,21,共3页
Computer Era
基金
浙江省自然科学基金项目(LY15F010007
Y1110510)
浙江省计算机科学与技术重中之重学科开放项目(ZC323014101)
国家自然科学基金项目(61401399)
