Investigation of double way-quadrature phase shift key (DW-QPSK) for digital communication consumer applications

Abstract

The digital modulation provides more information capacity, compatibility with digital data services, higher data security, better quality communications, and quicker system availability. The RF spectrum must be shared, yet every day there are more users for that spectrum as demand for communications services increases. Digital modulation schemes have greater capacity to convey large amounts of information than analog modulation schemes. This paper has been focused on the investigation and study of a new DW-QPSK for digital communication applications. The performance analysis of the modulation and demodulation schemes for the proposed DW-QPSK at noise channels which are subjected to Rayleigh fading and additive white Gaussian noise have been simulated and introduced to demonstrate the excellent performance of the proposed DW-QPSK compared with the conventional QPSK. The proposed DW-QPSK simulation results achieve uniformly spaced constellations with equispaced signal points, design simplicity, flexibility, low cost and enhancement performance compared with Traditional trellis-coded modulation (TCM) and superposition coded modulation (SCM) to meet the requirements for digital communication consumer applications.