SUMMARYRecently, a number of researchers have proposed media access control (MAC) designs for ultra-wideband (UWB) networks. Among them, designs based on scheduling and power control seem to be of great promise, particularly for quality-of-service (QoS) traffi c. We investigate the effi ciencies of many different choices for scheduling and power allocation for QoS traffi c in a multihop impulse radio (IR)-UWB network, with the objective of achieving both high spectral effi ciency and low transmission power. Specifi cally, we compare different scheduling schemes employing a protocol interference-based contention graph as well as a physical interference-based contention graph. We propose a relative distance to determine adjacency in the protocol interference-based contention graph. Using our improved protocol interference model with graph-based scheduling, we obtained better performance than the physical interference-based approach employing link-by-link scheduling.
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