Title: Hierarchical DWT-based optimal diversity power allocation for video transmission in OFDMA/MIMO wireless systems
Authors: Sohil Mahajan; Aditya K. Jagannatham
Addresses: Electrical Engineering Department, Indian Institute of Technology Kanpur, Kanpur, 208016, India. ' Electrical Engineering Department, Indian Institute of Technology Kanpur, Kanpur, 208016, India
Abstract: In this paper, we propose novel algorithms for optimal power allocation towards video transmission in orthogonal frequency division multiple access (OFDMA) and multiple-input multiple-output (MIMO)-based 4G networks. A unique feature of the schemes is that they employ diversity dependent subcarrier power distribution relying on a discrete wavelet transform (DWT)-based hierarchical video decomposition, with exclusively order statistics-based partial channel state information (CSI). This is formulated as a convex minimisation problem and closed form expressions are derived for diversity-based optimal power allocation. We also propose novel algorithms for diversity order-based optimal power allocation for video transmission in MIMO systems. Further, we consider a practical MIMO scenario and employ a limited feedback technique utilising the index of the quantised beamforming vector. A closed form expression for the optimal power allocation is presented based on an iterative convex optimisation framework. Simulation results demonstrate superior performance of the proposed optimal power allocation schemes.
Keywords: orthogonal frequency division multiple access; OFDMA; multiple-input multiple-output; MIMO; convex optimisation; optimal power allocation; OPA; wireless video transmission; 4G networks; discrete wavelet transforms; DWT; hierarchical video decomposition; simulation.
International Journal of Internet Protocol Technology, 2012 Vol.7 No.1, pp.39 - 51
Available online: 02 Jul 2012 *Full-text access for editors Access for subscribers Purchase this article Comment on this article