Power reallocation and complexity enhancement for beyond 4G systems

Abstract

Competitiveness in the modern wireless systems' provided services is a key factor in the development, in addition to the adaptation to/harmonization of user demand. Therefore, this paper discussed the quality of services from the point of view of the need for supporting the needed data rates. For this purpose, a benchmark based on Multi-Antenna Multiband Orthogonal Frequency Division Multiplexing has been proposed to compatible with Ultra-Wideband systems such as the fifth generation based technologies. In order to enhance the system quality of service, the structure of the ultra-wideband system's main stage; namely Orthogonal Frequency Division Multiplexing has been modified by imposing a low complexity designed Haar-wavelets stage instead of the fast Fourier transform stage. This is in addition to reallocate the transmitted power in order to reduce the effect of one of the main drawbacks that is found in the Orthogonal Frequency Division Multiplexing; namely the peak-to-average power ratio problem. A MATLAB simulation has been performed in order to validate the propositions that have been made based on six different performance factors. As a result, the new propositions were achieved our targets by reducing the system's complexity in terms of mathematical operations and by giving promising results in managing the transmitted powers. Furthermore, the effectiveness of such work has been verified and compared with four different work in the literature.