自适应OFDM中信号盲检测技术

Study of blind detection techniques in adaptive OFDM

提出了一种基于高阶累积量的正交频分复用信号子信道调制方式盲检测算法.该算法利用高阶累积量检测特征实现对子信道调制方式的检测,所提出的检测特征可抑制高斯噪声的影响.从理论上证明了高阶累积量检测特征对于子信道的信道衰减和相位旋转具有不变性.通过计算机仿真评估了正交频分复用信号子信道调制方式盲检测算法的性能,表明这种算法在慢时变信道下具有很高的调制方式检测性能和良好的稳健性.

A blind detection algorithm based on Higher-order cumulants（HOC） is proposed to detect the modulation scheme for the OFDM subcarriers. Its detection feature is robust to the Gaussian noise and is invariant with respect to the attenuation and the phase rotation induced by subchannels. The invariant property is theorecticaUy proved. The high performance and robustness of the blind detection algorithms are proved by simulation.