Implementation of DQPSK based Transmitter on digital signal processor

Abstract: In recent times, the implementation of digital system on short-scale embedded platform is gaining interest of research community. However, the absence of implementation strategy is turning out to be a bottleneck. This paper presents a methodology for digital signal processor (DSP) based implementation of communication system with Differential Quadrature Phase Shift Keying (DQPSK) as band-pass modulation scheme. Most of the functional blocks of standard transmitter are implemented including signal encoding, baseband pulse shaping, and modulation. The symbols are transmitted over a wired channel in the presence of noise. For encoding the input data, Non-return-to-zero encoding scheme is implemented and for pulse shaping raised cosine pulse shape is implemented. An optimized strategy to implement basic blocks of communication system using embedded hardware is also presented. The formulated communication is further evaluated using a commercial Digital Signal Processor (DSP). Results have shown that the DQPSK based transmitter can be implemented on short-scale platforms such as DSP systems.