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Computer Simulation Results and Analysis for a Root-Raised Cosine Filter Design using Canonical Signed DigitsFilters implemented using Canonical Signed-Digit (CSD) number representation for the coefficients have been studied for many years as an efficient way to increase the speed and reduce the hardware complexity. A simple and very effective method for designing a CSD filter with a specific set of filter parameters has been investigated and its simulation results are presented here. In order to optimize filter coefficients into the corresponding CSD numbers, the Minimum Mean Square Error (MMSE) criterion is used. Furthermore, an attempt is made to improve frequency response of the CSD filter by allocating an extra non-zero digit for normalized coefficients exceeding one-half. Due to limited filter aperture width in examples presented here, the frequency response of CSD filter as the number of non-zero digits in a CSD code increases is not affected much. A root-raised cosine filter model is employed as a base line for this design approach. Finally, the CSD filter simulation results and a hardware complexity comparison with a conventional filter are also shown along with the eye diagrams an Bit-Error-Rate (BER) performance curves.
Document ID
19970009815
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Kim, Heechul (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1996
Subject Category
Communications And Radar
Report/Patent Number
NASA-TM-107327
E-10433
NAS 1.15:107327
Accession Number
97N15183
Funding Number(s)
PROJECT: RTOP 233-5A-5G
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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