Communication system using geographic position data
First Claim
1. A communication system comprising:
- a first transceiver located with a first user having a first processor and a first directional antenna array;
a second transceiver located with a second user having a second processor and a second antenna array;
a locator on at least one of the first user and second user that determines a physical location of one of the first and second antenna array;
a spatially multiplexed communication link formed between the first and second transceivers, and an adaptive programmable beamformer circuit in the first transceiver that shapes a communication beam directed between the first antenna array and the second antenna array, the adaptive programmable beamformer circuit having a single integrated chip having a plurality of complex multipliers, a plurality of down conversion circuits and a plurality of finite impulse response (FIR) filters programmable with respect to a plurality of delays and a steering circuit that adjusts the plurality of delays to the programmable beamformer circuit.
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Abstract
A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver. The system can be optimized by applying partially adaptive processing algorithms, which are seeded by geo-location data.
62 Citations
39 Claims
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1. A communication system comprising:
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a first transceiver located with a first user having a first processor and a first directional antenna array;
a second transceiver located with a second user having a second processor and a second antenna array;
a locator on at least one of the first user and second user that determines a physical location of one of the first and second antenna array;
a spatially multiplexed communication link formed between the first and second transceivers, and an adaptive programmable beamformer circuit in the first transceiver that shapes a communication beam directed between the first antenna array and the second antenna array, the adaptive programmable beamformer circuit having a single integrated chip having a plurality of complex multipliers, a plurality of down conversion circuits and a plurality of finite impulse response (FIR) filters programmable with respect to a plurality of delays and a steering circuit that adjusts the plurality of delays to the programmable beamformer circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An acoustic communication system comprising:
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a first transceiver having a directional antenna array, the directional antenna array having a first geographical position;
a second transceiver on a mobile unit having an antenna array, the antenna array being movable relative to the directional antenna array;
a spatially multiplexed communication link between the first and second transceivers formed by a communication signal between the antenna arrays;
a positioning system on the mobile unit that detects a geographical position of the mobile antenna arrays, the position of the mobile antenna array being communicated from the mobile transceiver to the first transceiver over the communication link;
an adaptive programmable beamformer circuit in the first transceiver that modifies the signal in response to the relative motion of the antenna arrays, the adaptive programmable beamformer circuit having a single integrated chip having a plurality of complex multipliers, a plurality of down conversion circuits and a plurality of finite impulse response (FIR) filters programmable with respect to a plurality of weights and a steering circuit that adjusts the plurality of weights to the programmable beamformer circuit; and
a nulling module coupled to the beamformer that suppresses interference to the signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for operating an acoustic communication system comprising:
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operating a first transceiver at a first unit and having a first processor and a first directional antenna array;
operating a second transceiver on a mobile unit having a second processor and a second antenna array;
determining the physical location of the second antenna array relative to the first antenna array;
forming a spatially multiplexed communication link between the first and second transceivers, the link including a communication beam between the first antenna array and the second antenna array; and
in an adaptive programmable beamformer integrated circuit chip in the first transceiver, responding to the physical location of the second antenna array, by using a plurality of complex multipliers, a plurality of down conversion circuits and shaping the communication beam using a plurality of programmable finite impulse response (FIR) filters with respect to a plurality of weights and steering the beam to be directed between the first antenna array and the second antenna array using the programmable beamformer circuit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method of operating an acoustic communication system comprising:
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operating a first transceiver having a first directional antenna, the first directional antenna having a fixed geographical position;
operating a mobile transceiver on a mobile unit having a second directional antenna, the second antenna being movable relative to the first directional antenna;
forming a spatially multiplexed communication link between the first and mobile transceivers by a communication signal between the antennas;
in a positioning system on the mobile unit, detecting the geographical position of the mobile antenna, the position of the mobile antenna being communicated to the first transceiver over the communication link; and
in a first adaptive programmable beamformer integrated circuit chip in the first transceiver and a second programmable beamformer integrated circuit chip in the mobile transceiver, modifying the signal in response to the relative motion of the antennas by using a plurality of complex multipliers, a plurality of down conversion circuits and shaping the communication signal using a plurality of finite impulse response (FIR) filters programmable with respect to a plurality of weights, and steering a beamformed signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A beamforming circuit for an acoustic communication system comprising:
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a plurality of sampling circuits for receiving communication signals;
a plurality of programmable finite impulse response (FIR) filters, each FIR filter being connected to a sampling circuit;
a summing circuit that sums filtered signals from the plurality of FIR filters; and
a directional communication signal formed from the summed signals. - View Dependent Claims (37, 38, 39)
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Specification