Abstract:
An apparatus and method of providing a bit masked heartbeat signal across a digital communication network to a plurality of managed devices, said method comprising the steps of: providing a state value for each one of said managed devices; generating a heartbeat packet comprising state data that incorporates said state value of each one of said managed devices; and transmitting said heartbeat packet to each one of said managed devices.
Abstract:
Disclosed is a hybrid antenna array (100) comprising a plurality of digital branches (145), each digital branch including an analogue beamforming sub-array (e.g. 110-1), each sub-array having a plurality of antenna elements (120), a phase shifter (130) adapted to apply a phase shift to the signal from each antenna element, and a combiner (e.g. 135-1) adapted to combine the phase-shifted signals. Each digital branch also includes a signal chain (e.g. 140-1) adapted to convert the output of the sub-array to baseband. The hybrid antenna array also comprises a digital processing module (150), including: an angle of arrival estimation sub-module (155) adapted to estimate an angle of arrival of a signal at the antenna elements; a phase control sub-module (170) adapted to control the phase shift applied by each phase shifter depending on the estimated angle of arrival; and a digital beamformer (165) adapted to combine the baseband signals from the digital branches using a weight vector to form an output signal (180).
Abstract:
Disclosed is a hybrid antenna array (100) comprising a plurality of digital branches (145), each digital branch including an analogue beamforming sub-array (e.g. 110-1), each sub-array having a plurality of antenna elements (120), a phase shifter (130) adapted to apply a phase shift to the signal from each antenna element, and a combiner (e.g. 135-1) adapted to combine the phase-shifted signals. Each digital branch also includes a signal chain (e.g. 140-1) adapted to convert the output of the sub-array to baseband. The hybrid antenna array also comprises a digital processing module (150), including: an angle of arrival estimation sub-module (155) adapted to estimate an angle of arrival of a signal at the antenna elements; a phase control sub-module (170) adapted to control the phase shift applied by each phase shifter depending on the estimated angle of arrival; and a digital beamformer (165) adapted to combine the baseband signals from the digital branches using a weight vector to form an output signal (180).
Abstract:
A wireless data communications method and transmitter are disclosed. A transmitter (402N, 800) includes a module (802) configured to group adjacent sub-bands from among a set of transmission radio frequency channels assigned to a terminal into a plurality of aggregated sub-bands. A single carrier modulator (804) is configured to modulate data symbols in at least some of said aggregated sub-bands. A combining module (808) is configured to combine said single carrier modulated signals into a multi-carrier signal. A receiver (502N, 900) is also provided in conjunction with the transmitter (800) to constitute a transceiver.
Abstract:
A communications system, including at least one base station (8) at the surface, at least one repeater station (6) below the surface, and at least one mobile station (4) below the surface, the stations (4, 6, 8) establishing a bidirectional communications path between the mobile station (4) and the base station (8).