VOLTERRA FILTER STRUCTURE FOR DS-CDMA
Rudolf Tanner, Cruickshank D.G.M. · 1996
This paper presents a receiver filter, based on V olterra functions, for a direct-sequence codedivision -multiple-access (DS-CDMA) system. The envisaged application would be cellular telephony, where the receiver will be required to be adaptive due to changes to the channel characteristics. The results obtained from the V olterra filter are compared against the linear minimummean -square-error (MMSE) filter and the nonlinear radial-basis-function (RBF) network for an additive-white-Gaussian-noise (AWGN) channel. 1 Introduction The growing demand for mobile communications will reach the capacity limits of existing systems soon. Hence, only the introduction of new concepts and systems will increase data transmission capacities since the frequency spectrum is limited. With the introduction of spread-spectrum (SS) technology and the availability of cheap microprocessor technology (especially digital-signalprocessors (DSP's)) we can exploit the SS technique with DS-CDMA to increase the co...