Enhanced frequency domain spreading for WiMedia UWB

WiMedia UWB is a high data rate OFDM system for wireless personal area networks. The design philosophy is a mixture of high throughput and low power consumption. The standard uses special time and frequency domain spreading to enable low power consumption for the low data rates and for low-end devices. A loss of channel diversity is observed in certain scenarios. First we describe an efficient frequency domain spreading implementation in time domain. Then using this key idea, we propose new spreading schemes, either to recover the diversity loss or to achieve additional power and hardware savings for low-end devices.