非正交频分复用系统的无干扰分离算法

Separation algorithm without interference in non-orthogonal frequency division multiplexing system

针对现有的非正交频分复用信号分离算法复杂度高这一问题,提出了对多路非正交频分复用信号可以实现无干扰分离的简化算法,通过建立系统模型和理论推导,使用傅里叶变换降低了非正交频分复用信号接收机的复杂度。系统仿真结果表明,使用非正交频分复用技术可以在更小的带宽内传输与OFDM相同速率的信号;在传输速率相同的情况下,由于传输带宽的减小,引入传输系统的噪声功率得到了降低,最终使得接收机处的误码率变小。

To solve the problem that the algorithm for separating non-orthogonal frequency division multiplexing signals is too completed, a separation algorithm without interference in non-orthogonal frequency division multiplexing system is proposed, according to building a new system model and theoretical derivation, the complexity of the receiver of non-orthogonal frequency division multiplexing system is reduced by using Fourier transform. The system simulation results shows that compared with the bandwidth of OFDM system, the bandwidth of non-orthogonal frequency division multiplexing system is smaller when the transmitting rate is the same, and the symbol error rate of on-orthogonal frequency division multiplexing system is lower when the transmitting rate keeps, for that the noise power in transmission system is reduced as a result of the reduction of the bandwidth.