低复杂度可配置变带宽滤波器组的设计

提出了一种低复杂度可配置变带宽滤波器组的设计方法,该方法基于快速滤波器组结构,并利用变带宽滤波器方法重新设计第0级原型滤波器而实现。该设计方法弥补了其他设计方案中带宽变化因子为整数的不足,同时在一定带宽的条件下,能够连续改变各子滤波器组通道的中心频率和在中心频率不变的条件下,能够连续可调对应的带宽。由于各级原型滤波器的系数具有稀疏特性,因而系统具有较低的实现复杂度,仿真结果表明,其所需乘法器的数量大约是其他方法的48.96%,可应用于如多标准无线接收机等变带宽场合中,完成频谱感知与数字信道化等功能。

Design of low complexity reconfigurable variable bandwidth filter bank

A scheme of low complexity reconfigurable variable bandwidth filter bank is proposed. The proposed scheme is achieved by modifying the prototype filter with variable bandwidth filter algorithm in the 0th stage based on fast filter bank (FFB). Compared to conventional implementations, the method can change the bandwidth with fractional scalar not restricted to integers. Meanwhile, the center frequency of wider combined sub channel of the filter bank can be changeable with a fixed bandwidth and at a specific center frequency, and the bandwidth can be also continuously adjusted. In addition, the prototype filters at all stages have sparse coefficients, which result in low complexity of implementation. The simulation results show that the number of multiplication required by the proposed scheme is about 48.96% of that needed by other methods. Based on the above advantages, the proposed scheme can be applicable in the scenario of variable bandwidth such as multi standard wireless receiver and performs spectrum sensing and digital channelization.