Hierarchical DWT-based optimal diversity power allocation for video transmission in OFDMA/MIMO wireless systems. (1st January 2012)

• Record Type: Journal Article
• Authors: Mahajan, Sohil; Jagannatham, Aditya K.
• Is Part Of: International journal of internet protocol technology. Volume 7:Number 1(2012)
• Page Start: 39
• Page End: 51
• Publication Date: 2012-01-01
• Subjects: orthogonal frequency division multiple access -- OFDMA -- multiple-input multiple-output -- MIMO -- convex optimisation, optimal power allocation -- OPA -- wireless video transmission; File Transfer Protocol (Computer network protocol) -- Periodicals; Multicasting (Computer networks) -- Periodicals; 004.678
• Languages: English
• ISSNs: 1743-8209

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.