New interpolator and data detector for full digital BPSK demodulator

Abstract

This work presents a new structure for an alldigital BPSK demodulator developed for space communications that performs simultaneously the sampling and down conversion from intermediate frequency signal to the baseband signal. A new interpolator is proposed in order to simplify the demodulator implementation. This interpolator correlates the samples of the output signal in such way that it was necessary to design a new data detector appropriate to process the samples corrupted by gaussian and colored noise. The effects of the new interpolation at the noise are analyzed as well as the way it affects the whole demodulator performance. Simulations were performed and the results are presented to confirm theoretical analysis.

Fully digital BPSK demodulator for satellite supressed carrier telecommand system

“…BPSK demodulation takes place from the modulated signal in intermediate frequency (IF) that is simultaneously converted from bandpass to baseband and from analog to digital by applying the bandpass sampling technique . This approach simplifies the design of down‐converter but causes loss of signal samples and intercalation between in‐phase and quadrature samples, as is shown in . The adopted solution to baseband conversion is similar to the one described in .…”