Soft wireless image/video broadcast based on component protection

With the widespread popularity of mobile terminals, wireless video has become an indispensable part of daily life. Recently, an uncoded transmission scheme called SoftCast was presented to provide graceful quality transition. After linear transformation, the energy of the signal is concentrated to a few coefficients. However, the protection of these coefficients is not enough in SoftCast. This paper introduces a component protection to protect these important coefficients to improve the performance. To avoid the overhead generated by component protection, we use hybrid digital-analog modulation to transmit both the analog signal and digital signal. The experimental results show that the proposed scheme can improve the performance of the original SoftCast using 2D-DWT (discrete wavelet transform) transform by 3-8 dB.