Multiuser Precoding for UWB Sensor Networks
The authors consider the downlink of an Ultra-WideBand (UWB) sensor network, i.e. communication from a central unit too many sensor nodes. The key to achieve low-complexity, low-power and low-cost sensor nodes are non-coherent receivers. Conventionally, their detection performance strongly suffers from inter-symbol interference due to multipath, which substantially limits the data rate or requires expensive receiver post-processing. To overcome this problem, they propose a novel pre-coding scheme to transmit to several nodes simultaneously. This way the sum data rate can be increased, while low complexity of sensor nodes is maintained. Specifically, they consider nodes with generalized energy detection receivers and transmission of pulse position modulated data.