变速率基带脉冲成形滤波技术

Variable Rate Baseband Pulse Shaping Filtering Technology

无线信道带宽资源有限,为了抑制码间干扰并提高频带利用率,必须对基带脉冲信号进行成形滤波。针对常规的查表法和可变插值滤波器法存在硬件资源消耗大和无法适应数据速率连续变化的问题,给出了一种改进方法;首先对待成形滤波的数据进行变速率降采样处理,经过FIR成形滤波器,最后通过变速率线性内插完成上采样处理。理论推导和仿真均验证了方法的有效性。该方法易于FPGA实现,相对常规方法降低了实现复杂度和硬件资源,通过实测验证了方法可行性,并成功应用于某空间型号。

he wireless channel bandwidth resources are limited. In order to restrain inter-symbol interference and increase the spectral efficiency,the shaping filtering of baseband pulse signal is necessary.Be directed against the problem that conventional techniques have the disadvantage of occupying massive resource and inflexibility,a modified technique is proposed. The data is down sampled and filtered by a FIR. The data are up sampled through variable rate linear interpolation. This method is easy to implement in FPGA. Compared with conventional methods,it reduces the complexity of implementation and hardware resources. The feasibility of this method is verified by actual measurement,and applied to some spaceflight simulator successfully.