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Design of Linear Phase Variable Digital Filter based on Spectral Parameter Approximation and Improved Coefficient Decimation Method

Publication Date : 30/06/2015



Author(s) :

Veena L.


Volume/Issue :
Volume 2
,
Issue 6
(06 - 2015)



Abstract :

Software   defined   radios   (SDRs)  and   cognitive radios (CRs) empower mobile communication handsets  to sup- port  multiple  wireless communication standards and  services, and  improve   the  spectrum   utilization   efficiency.  SDRs  and CRs  need  multi-  standard wireless  communication receivers (MWCRs)  to integrate existing  as  well as  imminent  commu- nication  standards into  a  single  generic  hardware platform. The limited reconfigurability of the analog front-end, sampling rate  constraints of the currently available  ADCs and extensive disparities   between  communication standards’  specifications, lead to the shifting of stringent channel(s)  selection task to the digital  front-end  (DFE). Thus,  the  DFE  needs  either  variable digital filters (VDFs) that  provide  variable  lowpass (LP), high- pass (HP), bandpass  (BP) and bandstop  (BS) responses and/or reconfigurable filter banks  that  provide  independent and  indi- vidual control  over the bandwidth and the center  frequency  of subbands.The linear  phase VDF is designed by combining new Improved  Coefficient Decimation Method(ICDM) with Spectral Parameter Approximation (SPA),termed  as SPA-ICDM VDF.In the proposed  filter bank,  subbands of desired  bandwidths are obtained  by the spectral  subtraction of the lowpass and  high- pass frequency  responses obtained  after  performing coefficient decimation  operations  on the prototype filter, using appropriate decimation  factors.


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Design of Linear Phase Variable Digital Filter based on Spectral Parameter Approximation and Improved Coefficient Decimation Method

June 30, 2015