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基于ALTERA公司提供高级数字信号处理模块,对LTE通信系统的信号采样率进行变速率滤波。由于FIR滤波器存在较大的群时延和硬件时延,信号经过滤波后有可能产生分数时延,使相位发生旋转。提出了一种新的时延补偿方法,对每一级滤波器进行时延补偿。板级测试结果表明,基带信号通过该滤波器后,星座图恢复完好,EVM小于1%,且与Matlab定点仿真结果一致。
Based on ALTERA company to provide advanced digital signal processing module, the signal rate of the LTE communication system for variable rate filtering. FIR filter because of the larger group delay and hardware delay, the signal is filtered may have fractional delay, so that the phase rotation. A new delay compensation method is proposed to compensate the delay of each filter. Board-level test results show that, after the baseband signal through the filter, the constellation recovery is intact, EVM is less than 1%, and consistent with the results of Matlab simulation.