Abstract: A discrete polyphase digital filter is provided having only a single multiplier and a single cumulative adder for use in a mobile telephone. In one implementation, the filter is a discrete N-phase digital filter including an input line providing an input signal and a group of M delay elements connected to the input line for generating M successively delayed versions of the input signal. A coefficient memory unit is provided for storing M filter coefficients. A multiplier is connected to outputs of the delay elements and to the coefficient memory for multiplying the output of each successive delay element with a corresponding coefficient. A cumulative adder is also provided for summing M successive outputs from the multiplier to provide a single, filtered output signal for each group of M input signals. The multiplier and adder are operated at a rate of M/N times a frequency of the input signal to thereby provide one output signal for every N input signals.

Abstract: A concentrated subscriber wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices. The metering system comprises at least one powerline remote metering device which collects and forwards telemetry data to an associated wireless remote telemetry device. The wireless remote telemetry device relays the telemetry data to a central controller over existing wireless communication systems, such as cellular base stations, using existing communication standards. The wireless remote metering device transmits various messages over a shared random access channel to the central controller. The central controller transmits messages to the wireless remote metering unit over a paging channel. The wireless remote metering unit may operate in a half-duplex mode only.

Abstract: A wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices. In an embodiment applicable to utility service, consumption of electrical power among a population of customers is measured by a utility metering system having a wireless communication capability. The metering system comprises a remote metering unit which communicates with a central controller over existing wireless communication systems, such as cellular base stations, using existing communication standards. The remote metering unit transmits various messages over a shared random access channel to a central controller. The central controller transmits messages to the remote metering unit over a paging channel. The remote metering unit may operate in a half-duplex mode only. Furthermore, the remote metering unit may provide a gateway to advanced consumer services at the remote location.