Quadrature linear digital modulator implementation in VHDL

In this article we describe our effort to create, model, implement and simulate a quadrature linear digital modulator. It is to be used as a part of advanced radio transmission system. We describe the process of modeling the modulator in Matlab in both floating and fixed point arithmetic for later implementation in VHDL language for FPGA. We also describe the techniques we have used to implement the modulator in digital domain using efficient parallel structure with elimination of multiplication operation. The complete system is then being simulated in ModelSim, compared with the model and results are presented and evaluated.