Manchester Encoding and QPSK Modulator for SDR

Modulator and encoding designs are mostly developed for application-specific integrated circuit (ASIC). Such system suffer great limitation as integrated circuits are not programmable. Field-programmable gate arrays (FPGAs) solve this problem by introducing reconfigurable hardware. Digital communications devices designed on FPGAs have the capability to accommodate multiple communications protocols without replacing existing hardware. For these reasons, FPGAs proves to be the ideal platform for implementing adaptive communications systems. This paper focuses on Manchester encoding and QPSK modulator design which falls as two major entities in modern communication system. The proposed system is designed to achieve low power consumption and reduced size compared to conventional analog devices. The system is developed in Xilinx platform using Verilog system design tool. Verilog enables fast and reliable operation and can be implemented in FPGAs. Thus making system reconfigurable on application.