Applications of joint source-channel distortion modeling
Our distortion models can be used in a variety of applications. They can be used to design low complexity real-time joint source-channel coding and unequal error protection methods for image and video communication. In addition, these models can also be used to develop efficient power allocation methods for image and video communication over wireless systems.
Using our JPEG distortion model to predict distortion, we have developed an unequal power allocation method for transmission of JPEG compressed images over MIMO systems. Different image quality layers are transmitted with unequal power over different transmit antennas using spatial multiplexing such that the overall distortion in the transmitted image is minimized with a constraint on the transmit power during any symbol period. A modified version of our JPEG distortion model is used to predict the distortion under varying channel conditions. The PSNR results for this method are compared to that of equal power allocation. These results showed that quality gains of up to 14 dB are achieved by using unequal power allocation as compared to equal power allocation. We are currently working on developing joint source-channel coding methods for image and video communication over MIMO systems.
Image transmitted at 5 dB SNR over
a Rayleigh fading channel using equal power
allocation
Image transmitted at 5 dB SNR over
a Rayleigh fading channel using our unequal power
allocation method
