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OFDM技术具有较高的频谱效率和良好的抗多径干扰能力,得到了广泛的关注和研究。全双工中继技术相比于半双工中继技术其频谱效率提高了一倍,但是当中继工作在全双工模式时,中继同时接收和发送数据,会产生收发自干扰,严重影响了系统的传输性能。将OFDM技术和全双工中继技术结合起来成为了一个非常有前景的研究方向。文章针对全双工OFDM中继系统,讨论了在OFDM和OFDMA两种中继选择方案下系统的中断概率,在推导过程中引入了有效信扰比这一概念,从而推导出两种方案下中断概率的闭式表达,并进行了仿真以验证理论结果。
OFDM technology has a higher spectral efficiency and good anti-multipath interference ability, has received widespread attention and research. Compared with the half-duplex relay technology, the full-duplex relay technology has doubled the spectrum efficiency. However, when the relay works in full-duplex mode, the relay receives and sends data at the same time, which causes serious interference The system’s transmission performance. The combination of OFDM technology and full-duplex relay technology has become a very promising research direction. In this paper, the full-duplex OFDM repeater system is discussed in the OFDM and OFDMA two kinds of relay selection scheme of the system’s interrupt probability, the introduction of the concept of an effective signal to interference ratio in the derivation process, which leads to the two options under the interruption Probability of closed-form expression, and conducted a simulation to verify the theoretical results.