WCDMA系统中SPT数字滤波器的一种设计方法

相对于传统的数字滤波器实现方法,符号的2次幂和(SPT)滤波器用移位寄存器替代乘法器,因而资源消耗少、速度快,更加适于专用集成电路(ASIC)设计.介绍了一种适用于宽带码分多址(WCDMA)前向信道中给定基带成形滤波器单位脉冲响应后设计SPT滤波器的方法.相对于传统的理想SPT系数优化方法,此方法更适于给定单位脉冲响应后SPT滤波器的设计,计算复杂度低;仿真结果显示,相对于更加简单的四舍五入方法,此算法在性能上又有可观的增益.

A Method of Design of Digital Filters with Signal Power-of-two Coefficients in WCDMA System

The conventional method uses digital filter, but the SPT filter replaces the multipliers by shift register, resulting in low cost, high speed which is much more suitable for ASIC design. The digital filters with coefficients expressed as sums of signed power of two(SPT) terms have been analyzed in detail. This paper presents and algorithm suitable for the digital filter design in WCDMA forward channel, in which, the impulse response of the base band transmit pulse shaping filter has been descirbed. Unlike conventional optimization methods, this method is much more suitable for SPT filter design with lower computing load to get the optimum impulse response. Results show that this algorithm works better than the simple rounding approach.