VLSI architecture of the blind carrier phase tracking with guaranteed global convergence

To overcome the instability of conventional blind carrier recovery algorithms when applied to large constellation modulation, the ”blind carrier tracking with guaranteed global convergence” algorithm has been proposed, reused and several times cited in the literature. The need of its portable VLSI implementation requires its simplification to be based on a simple process with usual arithmetic operators. Actually, this paper presents that dedicated and simplified algorithm and its most important design issues and solutions. It highlights mainly some modules, such as some arithmetic and storage components showing, for instance, an arctangent implementation that can be run only in three clock cycles while always retrieving the needed angle's resolution. Finally, simulation results are provided to show the effectiveness of the proposed design in a Quadrature Amplitude Demodulation environment.