Understanding the Ultrawideband Channel Characteristics Within a Computer Chassis

A measurement-based, statistical ultrawideband (UWB) channel model is presented for the unique environment within a computer chassis. The channel impulse response parameters are derived from measurement data. Because of the short-range communications, a mixture of near-field and far-field propagation is characterized by the use of a breakpoint path-loss model. Due to the near-field nature of this environment, an unusually large number of clusters and rapid cluster decay time is noted in the channel impulse response. Additionally, electromagnetic interference measured inside a computer chassis that is generated by the motherboard in a custom fully operational mode is presented, wherein it is observed that the CPU clock does not appear as a significant interference source.