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OFDM把宽带频率选择性衰落划分为多个窄带平坦衰落,能有效地对抗衰落信道符号间干扰,广泛应用于数字电视、无线局域网以及4G移动通信领域。信道估计作为OFDM关键技术之一,针对给定信道的最大多普勒频移、最大多径时延条件下,利用二维MMSE算法设计最优导频图案以及维纳滤波插值阶数,并且在FPGA中进行实现。与常规二维维纳滤波相比,其具有硬件复杂度低,接近理想估计性能的特点,具有一定的工程参考和应用价值。
OFDM divides broadband frequency selective fading into multiple narrow-band flat fading, which can effectively combat intersymbol interference of fading channels and is widely used in the fields of digital television, wireless LAN and 4G mobile communications. As one of the key technologies of OFDM, channel estimation is used to design the optimal pilot pattern and Wiener filter interpolation order based on the maximum Doppler shift and maximum multipath delay for a given channel. FPGA to achieve. Compared with the conventional two-dimensional Wiener filter, it has the characteristics of low hardware complexity and close to ideal estimation performance, and has certain engineering reference and application value.