More and more many mobile devices are used in our life. Recently, ear phones are connected to mobile phones wirelessly and mobile phones can be linked to cars with bluetooth wireless connectivity technology. Up to now, the link is designed for low rate communciations such as voice or audio links, which required less throughput.

Some applications whic are baed on video information requires high throughput links. In order to use high throughput wireless links, large bandwidth is needed unless advanced interference mangement schemes are not used. Frequency bands for personal wirelss equipments are limited by radion regulation because already most feasible spectrum resource are allocated for other purposes including medical, puplic purposes.

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