摘要
基于ALTERA公司提供的DSP BUILDER ADVANCED,对LTE通信系统的系统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.对此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.
The DSP BUILDER ADVANCED in ALTERA is used to change the system sample rate in LTE communication system. As the result of the group delay and hardware of FIR filter , the fractional delay and the rotation of phase is generated possibly. A new scheme is introduced to compensate for the delay for each filter. It is shown by the test on-hoard that the the constellation is perfect and the EVM is under 1% when the baseband signal passed the filter, which is accorded to the fixed-point simulation result of MATLAB.
出处
《微电子学与计算机》
CSCD
北大核心
2009年第11期63-65,69,共4页
Microelectronics & Computer
