基于坐标变换的OFDM均衡方法

Equalization for OFDM system based on coordinate transformation

摘要:

介绍了应用于正交频分复用(OFDM)系统中的一种基于坐标变换的信道均衡方法。该方法利用块导频进行信道估计，通过坐标旋转数字计算方法(CORDIC)进行坐标变换，并通过线性插值的方法跟踪补偿信道的时变衰落，从而提高系统的信道适应性；同时由于CORDIC将频域的数据线性化，有效降低了传统信道均衡方法的复杂度，便于硬件实现。仿真结果验证了该方法的有效性和适应性。

Abstract:

A channel equalization method applied in Orthogonal Frequency Division Multiplexing(OFDM) system is introduced based on coordinate transformation. This method adopts block pilots to estimate channel response firstly; then by means of Coordinate Rotation Digital Computer(CORDIC) coordinate transformation, the time-selective fading of channel is compensated. Therefore, the adaptability of the communication system can be improved. Meanwhile, by the linearization of CORDIC at frequency domain, it decreases the complexity of traditional methods of channel equalization and makes them easy to be implemented by hardware. Simulation results indicate the effectiveness and adaptability of the method.