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IJSTR >> Volume 1 - Issue 4, May 2012 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



ANALYSIS OF EFFICIENT ARCHITECTURES FOR FIR FILTERS USING COMMON SUBEXPRESSION ELIMINATION ALGORITHM

[Full Text]

 

AUTHOR(S)

M.Thenmozhi,N.Kirthika

 

KEYWORDS

Software Defined Radio (SDR), channelizer, FIR filter, common subexpression elimination.

 

ABSTRACT

Finite Impulse Response (FIR) filters are widely applied in multistandard wireless communications. The two key requirements of FIR filters are reconfigurability and low complexity. In this paper, two reconfigurable FIR filter architectures are proposed, namely Constant Shift Method [CSM] and Programmable Shift Method [PSM]. The complexity of linear phase FIR filters is dominated by the number of adders (subtractors) in the coefficient multiplier. The Common Subexpression Elimination (CSE) algorithm reduces number of adders in the multipliers and dynamically reconfigurable filters can be efficiently implemented. A new greedy CSE algorithm based on Canonic Signed Digit (CSD) representation of coefficients multipliers for implementing low complexity higher order FIR filters. Design examples shows that the filter architectures offer power reduction and good area and speed improvement over the existing FIR filter implementation.

 

REFERENCES

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