Unequal Power Allocation for JPEG Transmission Over MIMO Systems

With the introduction of multiple transmit and re- ceiveantennas innext generationwireless systems, real-time image and video communication are expected to become quite common, since very high data rates will become available along with im- proveddatareliability.Newjointtransmissionandcodingschemes that explore advantages of multiple antenna systems matched with source statistics are expected to be developed. Based on this idea, we present an unequal power allocation scheme for transmission of JPEG compressed images over multiple-input multiple-output systems employing spatial multiplexing. The JPEG-compressed image is divided into different quality layers, and different layers are transmitted simultaneously from different transmit antennas using unequal transmit power, with a constraint on the total transmit power during any symbol period. Results show that our unequal power allocation scheme provides significant image quality improvement as compared to different equal power allo- cations schemes, with the peak-signal-to-noise-ratio gain as high as 14 dB at low signal-to-noise-ratios.