Filter requirements for wideband mobile radio systems

Abstract

This paper investigates the Bit Error Rates (BER) obtained using different filter types for RF front ends for wideband mobile radio systems. Most Base Stations use Chebychev or Cauer-Chebychev filters. This paper compares the use of Bessel, Butterworth and Chebychev filters for use as single channel filters in wideband radio systems. It is shown that even though Bessel filters pass more adjacent channel interference energy, for most operating conditions, they result in a significantly lower Bit Error Rate (BER) and insertion loss than the other filter types.

The effect of filter type on BER of WCDMA-UMTS mobile radio systems

“…The resulting RF signal can be simulated using a QPSK signal, modulated by random data at the chip rate. An initial investigation on the effects of filter types used a 1 Mcps chip rate [4]. The results presented here are for WCDMA (UMTS), which has a chip rate of 3.84 Mcps, a channel spacing of 5 MHz and a typical Channel Bandwidth of 4.2 MHz.…”