Indian Institute of Technology Kanpur
In this paper, the authors propose and investigate the performance of optimal power loading algorithms towards scalable video transmission over an Orthogonal Frequency Division Multiplexing (OFDM) based Cognitive Radio (CR) system. The proposed power allocation scheme minimizes the overall video distortion while restricting secondary user interference. For this purpose, they employ the two level Daubechies wavelet D2 to encode the video as a layered scalable stream comprising of one Base layer and several enhancement layers. The coded video layers are assigned to the secondary OFDM subcarriers of the CR user. A convex optimization framework is developed for video distortion as a function of the subcarrier power allocation.