FPGA implementation of a demux based on a multirate filter bank

In this paper an extensive comparison among alternative algorithms for the implementation of a digital demultiplexer has been carried out. The computational complexity, the performances and the accuracy with respect to the quantization noise effects have been evaluated for the different algorithms. In particular, the digital architecture has been designed to replace an analog filter bank composed of six surface acoustic wave (SAW) devices. This implementation is used, at present, by Alenia Space Division in the Eutelsat Hot-Bird satellites. The obtained digital architecture has been mapped on six Altera Flex 10K-100 devices. The final test bed, that includes a complete interface to the Alenia demodulator, has been implemented on a four-layers PCB.