Design and simulation of QPSK reconfigurable digital receiver

This paper presents the design of a QPSK multirate radio receiver with non - synchronized Intermediate Frequency (IF) and reconfigurable downsampling conversion. In order to avoid the aliasing the compensated cascade of integrator comb (CIC) filter is introduced. The non-synchronized samples need a timing synchronization correction, performed at the output of the matched filter using Farrow structure-based interpolator. The receiver is simulated in Matlab and Simulink and results are verified by computation of the number of Erroneous bits obtained during the simulation.