W-band millimeter wave can support high speed wireless, long distance transmission due to the characteristics of high frequency and wide bandwidth. It is a very promising technique in future wireless communication. To investigate the wireless transmission characteristics of W-band millimeter wave, the model of W-band wireless channel is analyzed, and millimeter wave based on photonic beating technique is generated through experiment in this paper. The results show that the 90 GHz W-band real-time communication system with bit rate of 1.485 Gb/s is set up, and uncompressed High-Definition video(HD video) data is successfully transmitted over 265 m. This is the longest distance using W-band millimeter wave to deliver a live uncompressed HD-video wireless signal so far.