A mobile communication system comprises a base station and a relay station to relay data transmittedreceived between the base station and a mobile station. Similarly, a hybrid speed and or proximity sensor may include a variable inductance proximity sensor having a magnet and a magnetically permeable pole piece added in the sensor. At a receiver, channel impulse response is used to determine which codewords from the known codebook have been used, and by which weights from a known constellation of weights the resultant waveforms have been weighted. A routing through the router is determined including a next hop index describing the next connection in the network. The alignment line indicators include first and second outer line segments spaced apart more than the first inner spacing and less than the diagonal distance. The device power limits are dynamically selected according to a power management method that selectively reduces the device power limits of lower-utilization devices and increases the device power limits of higher-utilization devices.