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A Study on Pulse Shaping of Linear Phase filter block with Variable Cutoff Frequency in PCM/FM transmission  

Lee Sang-Rae (한국항공우주연구원 우주발사체기술실 전자그룹)
Ra Sung-Woong (충남대학교 전자공학과 영상통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.1C, 2006 , pp. 65-73 More about this Journal
Abstract
The purpose of this study is to design and analyze the pre-modulation filter with the variable -3dB cutoff frequency and linear phase response for bandlimiting the allocation of radio frequency bandwidth in PCM/FM transmission system. For the implementation of this required filter, the digital FIR filter, DAC and variable 2nd order LPF have been constructed with the filter block which designed and analyzed by each stage in order to satisfy the attenuation characteristic requirement of the analog 7th order bessel filter. The paper also concerned the linear phase properties for the filter block. Especially we have carried out the linear phase simulation with real parts for variable 2nd order LPF and compared this simulation results with the one of the fixed bandwidth 2nd order bessel filter for validating the linear phase requirement.
Keywords
PCM; FM; FIR; DAC; LPF;
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