A Novel Power Allocation Scheme for Robust Transmission of JPEG Compressed Images over MIMO System Using LLSE

This paper deals with the efficient transmission of JPEG compressed images over Multiple Input Multiple Output (MIMO) systems using Spatial Multiplexing (SM). By exploiting the advantages of multiple antenna systems, data-rate, reliability, and throughput can be improved. The images are compressed using a progressive Discrete Cosine Transform (DCT) based JPEG coder with spectral selection mode and an antenna selection scheme is performed (assuming perfect channel knowledge at the transmitter and receiver). The Signal to Interference Noise Ratio (SINR) of different antenna paths are calculated and the antennas are arranged in decreasing order of SINR´s to transmit the different layers with a novel power allocation scheme. Linear Least Square Estimate (LLSE) algorithm is used to estimate the transmitted vector since it has the desirable property of not enhancing noise as much as the ZF estimator. The proposed scheme provides significant image quality improvement and less distortion compared to the existing EPA without SM.