In recent years, high speed railway (HSR) has been widely deployed in many countries as it has good capabilities of transportation at comparatively low cost and low impact on the environment. Therefore, train-ground wireless communication is becoming a hot research field. This new communication technology has dramatically changed the way people access information and interact with each other. However, for higher data transmission rate and better user experience in voice and video broadcasting, new transmission technologies are of necessity to combat with the propagation problems in HSR scenarios, such as the severe Doppler frequency deviation, high fading rate caused by the rapid changing channel environments, and significant signal attenuation due to the hermetic train [1].