Professor Identifies Filters That Lower BER of Wideband Mobile Communications
James Cook University (JCU) is a public teaching and research institution and is the second oldest university in Queensland, Australia. It has been graduating engineering students since its inception. The College of Science and Engineering is the home of JCU’s expertise in the physical sciences, chemistry, earth sciences, and engineering, forming a strong grouping uniquely placed to tackle the grand challenges facing the tropical world.
The Design Challenge
Most mobile communications base stations use Chebychev or Cauer-Chebychev filters, which give the best protection from out-of-band signals entering the receiver. However, their poor group delay can cause degradation of the waveforms and result in higher bit error rate (BER) and lower performance of the radio. Also, for a given insertion loss and bandwidth, Chebychev filters require a higher Q value of the individual resonators used in the filter. To compare Bessel, Butterworth, and Chebychev filters for use as single-channel filters in code division multiple access (CDMA) wideband radio systems to discover which filter type gives the lowest BER when using a given resonator Q.
For this filter study, JCU’s Dr. C. J. Keith Kikkert wanted to determine which filter type results in the lowest BER for an RF filter. He used Visual System Simulator™ (VSS) system design software to simulate, investigate, and compare the behavior of Bessel, Butterworth, and Chebychev filter types when used as RF filters protecting the mobile radio base station front end from interference.
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For more information about this application, the original paper that is the inspiration for this success story can be accessed by IEEE members at ieeexplore.ieee.org/document/4449608