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正交频分复用(OFDM)作为一种高速无线传输技术被广泛用于下一代无线通信系统,但目前常用的指数基内在缺陷制约了其性能的进一步提升.首先利用小波基替代传统指数基,并通过分析二尺度方程,推导出了基于离散小波变换(DWT)的正交波分复用(OWDM)系统的矩阵表达形式,在此基础上设计了多径衰落信道下的最小均方误差(MMSE)均衡器,最后的系统仿真表明当选择合适的小波基类型,所提出的OWDM系统可以有效改善传统OFDM系统性能.
As a high-speed wireless transmission technology, orthogonal frequency division multiplexing (OFDM) is widely used in next-generation wireless communication systems, however, the commonly used exponential base defects limit its performance further.Firstly, wavelet base is used to replace traditional index base , And through the analysis of two-scale equation, the matrix representation of orthogonal wave division multiplexing (OWDM) system based on discrete wavelet transform (DWT) is deduced. Based on this, the minimum mean square error (MMSE) equalizer. The final system simulation shows that the proposed OWDM system can effectively improve the performance of the traditional OFDM system when selecting the appropriate wavelet base type.