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This paper presents an overview of the PSK and QAM modulations, two digital modulation techniques. Based on recent development of software tools and FPGA circuits, the present paper improves a solution for implementing the PSK demodulation technique on a Virtex 5 board. The design of a BPSK detector, all digital, implemented on the FPGA is also considered.

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Nonlinear adaptive filtering techniques are widely used for the nonlinearities identification in many applications. This paper proposes a new implementation of the third order RLS Volterra filter based on the decomposition of the input vector. Its performances are evaluated in a typical nonlinear system identification application. Different degrees of nonlinearity for the nonlinear system are considered. Comparations, based on the adaptive filter error, are made in all cases with a linear identifier. The experimental results show that the proposed nonlinear identifier has better performances than the linear one.