Wireless telephone distribution system with time and space diversity transmission for determining receiver location
First Claim
1. In a wireless communication system, wherein a data packet is communicated from a transmitter to a receiver to form a received data packet, a method for determining the location of said receiver, said system including first, second and third antennas spaced apart from each other, said method comprising:
- transmitting said data packet from said first antenna to form a first transmitted data packet;
transmitting said data packet from said second antenna to form a second transmitted data packet after said first transmitted data packet;
transmitting said data packet from said third antenna to form a third transmitted data packet after said second transmitted data packet;
receiving in sequence said first, second and thirdtransmitted data packets at said receiver forming respective first, second and third received data packets;
selecting at least one of said first and second received data packets to form said digital data at said receiver;
measuring the respective time of arrival of said first, second and third transmitted data packets at said receiver; and
computing the location of said receiver from said respective measured time of arrival of said first, second and third transmitted data packets.
2 Assignments
0 Petitions
Accused Products
Abstract
A wireless communication system combines time and space diversity to reduce fading and simplify receiver design. In particular, a data packet which carries digital telephone traffic, is transmitted at three different times from three different antennas. The mobile subscriber receiver thus receives the same data packet at three different times from three different antennas, and uses the best data packet or combination of the data packets to reduce the effects of fading. A transfer station receives a time division multiplex multiple access (TDMA) signal from a base station carrying telephone data packet traffic to form three data packet repeats at spatially diverse antennas locations. The transfer station further modulates a code division multiple access (CDMA) system using a TDMA signal which links the mobile subscriber receiver to the transfer station. Each data packet received at the transfer station is thus retransmitted at three different times to the mobile subscriber station on a CDMA link. In one embodiment, each transfer station includes the three space diversity antennas. In a second embodiment, three transfer stations, each with one spatially diverse antenna is used. The time division and code division multiplex signals transmitted from space diversity antennas provide the ability to determine subscriber location using the same communication signals which are used for the primary telephone data communication. Specifically, the subscriber station receiver uses the absolute and relative time of arrival of the three repeated data packets to determine the respective distances of the mobile subscriber station to the three transmitting antennas. Since the transmitting antennas are at known fixed locations, receiver location is determined.
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Citations
80 Claims
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1. In a wireless communication system, wherein a data packet is communicated from a transmitter to a receiver to form a received data packet, a method for determining the location of said receiver, said system including first, second and third antennas spaced apart from each other, said method comprising:
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transmitting said data packet from said first antenna to form a first transmitted data packet; transmitting said data packet from said second antenna to form a second transmitted data packet after said first transmitted data packet; transmitting said data packet from said third antenna to form a third transmitted data packet after said second transmitted data packet; receiving in sequence said first, second and third transmitted data packets at said receiver forming respective first, second and third received data packets; selecting at least one of said first and second received data packets to form said digital data at said receiver; measuring the respective time of arrival of said first, second and third transmitted data packets at said receiver; and computing the location of said receiver from said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (2, 3, 4, 5)
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6. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a CDMA PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, a method in a receiver in said subscriber station for receiving said data packet, said method comprising:
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receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet; wherein said system further includes retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said method for receiving said data packet in said subscriber station receiver further comprising; receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet; selecting at least one of said first, second and third received data packets to form said received data packet at said receiver; measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station, and computing and subsequently storing in said subscriber station the location of said subscriber station from said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (7, 8, 9, 10, 11)
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12. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a CDMA PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, a method in a receiver in said subscriber station for receiving said data packet, said method comprising:
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receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet; wherein said system further includes retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said method for receiving said data packet in said subscriber station receiver further comprising; receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet; selecting at least one of said first, second and third received data packets to form said received data packet at said receiver; measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station; computing a location file comprising data representing the location of said subscriber station from said respective measured time of arrival of said first, second and third transmitted data packets; and transmitting the contents of said location file containing data corresponding to said measured respective time of arrival of said first, second and third transmitted data packets at said subscriber station from said subscriber station to said base station. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. In a wireless communication system, wherein a data packet is communicated from a transmitter to a receiver to form a received data packet, an apparatus for determining the location of said receiver, said system including first, second and third antennas spaced apart from each other, said apparatus comprising:
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means for transmitting said data packet from said first antenna to form a first transmitted data packet; means for transmitting said data packet from said second antenna to form a second transmitted data packet after said first transmitted data packet; means for transmitting said data packet from said third antenna to form a third transmitted data packet after said second transmitted data packet; means for receiving in sequence said first, second and third transmitted data packets at said receiver forming respective first, second and third received data packets; means for selecting at least one of said first and second received data packets to form said digital data at said receiver; means for measuring the respective time of arrival of said first, second and third transmitted data packets at said receiver; and means for computing the location of said receiver from said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (22, 23, 24, 25)
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26. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a CDMA PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, an apparatus in a receiver in said subscriber station for receiving said data packet, said apparatus comprising:
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means for receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; means for receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet, wherein said system further includes retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said apparatus for receiving said data packet in said subscriber station receiver further comprising; means for receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet;
means for selecting at least one of said first, second and third received data packets to form said received data packet at said receiver;means for measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station, and means for computing and subsequently storing in said subscriber station the location of said subscriber station from said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (27, 28, 29, 30, 31)
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32. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a cdma PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, an apparatus in a receiver in said subscriber station for receiving said data packet, said apparatus comprising:
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means for receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; means for receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet; wherein said system further includes means for retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said apparatus for receiving said data packet in said subscriber station receiver further comprising; means for receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet; means for selecting at least one of said first, second and third received data packets to form said received data packet at said receiver; means for measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station; means for computing a location file comprising data representing the location of said subscriber station from said respective measured time of arrival of said first, second and third transmitted data packets; and means for transmitting the contents of said location file containing data corresponding to said measured respective time of arrival of said first, second and third transmitted data packets at said subscriber station from said subscriber station to said base station. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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41. In a wireless communication system, wherein a data packet is communicated from a transmitter to a receiver to form a received data packet, including a method for determining the location of said receiver, said system including first, second and third antennas spaced apart from each other, a method for calibrating said location system, said calibration method comprising:
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positioning a calibration receiver at a known location; transmitting said data packet from said first antenna to form a first transmitted data packet; transmitting said data packet from said second antenna to form a second transmitted data packet after said first transmitted data packet; transmitting said data packet from said third antenna to form a third transmitted data packet after said second transmitted data packet; receiving in sequence said first, second and third transmitted data packets at said calibration receiver forming respective first, second and third received data packets; measuring the respective time of arrival of said first, second and third transmitted data packets at said calibration receiver; computing the location of said calibration receiver from said respective measured time of arrival of said first, second and third transmitted data packets; and comparing the computed location of said calibration receiver to said known location. - View Dependent Claims (42, 43)
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44. In a wireless communication system, wherein a data packet is communicated from a transmitter to a receiver to form a received data packet, including an apparatus for determining the location of said receiver, said system including first, second and third antennas spaced apart from each other, an apparatus for calibrating said location system, said calibration apparatus comprising:
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a calibration receiver positioned at a known location; means for transmitting said data packet from said first antenna to form a first transmitted data packet; means for transmitting said data packet from said second antenna to form a second transmitted data packet after said first transmitted data packet; means for transmitting said data packet from said third antenna to form a third transmitted data packet after said second transmitted data packet; means for receiving in sequence said first, second and third transmitted data packets at said calibration receiver forming respective first, second and third received data packets; means for measuring the respective time of arrival of said first, second and third transmitted data packets at said calibration receiver; means for computing the location of said calibration receiver from said respective measured time of arrival of said first, second and third transmitted data packets; and means for comparing the computed location of said calibration receiver to said known location. - View Dependent Claims (45, 46)
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47. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a CDMA PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, a method in a receiver in said subscriber station for receiving said data packet, said method comprising:
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receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet; wherein said system further includes retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said method for receiving said data packet in said subscriber station receiver further comprising; receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet; selecting at least one of said first, second and third received data packets to form said received data packet at said receiver; measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station; computing a location file comprising data corresponding to said respective measured time of arrival of said first, second and third transmitted data packets; and transmitting the contents of said location file containing data corresponding to said measured respective time of arrival of said first, second and third transmitted data packets at said subscriber station from said subscriber station to a location service center separate from said base station. - View Dependent Claims (48, 49, 50, 51)
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52. In a wireless communication system, wherein a data packet is communicated from a base station to a subscriber station using a cdma PN sequence, said system including at least one transfer station between said base station and said subscriber station for receiving said data packet from said base station and retransmitting said data packet using said PN sequence to said subscriber station on a first antenna to form a first transmitted data packet and retransmitting said data packet using said PN sequence on a second antenna to form a second transmitted data packet after said first transmitted data packet, an apparatus in a receiver in said subscriber station for receiving said data packet, said apparatus comprising:
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means for receiving said first transmitted data packet at said subscriber station receiver forming said first received data packet; means for receiving said second transmitted data packet at said subscriber station receiver forming respective second received data packet after receiving said first transmitted data packet; wherein said system further includes retransmitting said data packet using said PN sequence on a third antenna to form a third transmitted data packet after said second transmitted data packet, said apparatus for receiving said data packet in said subscriber station receiver further comprising; means for receiving said third transmitted data packet at said subscriber station receiver forming said third received data packet after receiving said second transmitted data packet; means for selecting at least one of said first, second and third received data packets to form said received data packet at said receiver; means for measuring the respective time of arrival using said PN sequence phase relative to said first, second and third transmitted data packets at said subscriber station; means for computing a location file comprising data corresponding to said respective measured time of arrival of said first, second and third transmitted data packets; and means for transmitting the contents of said location file containing data corresponding to said measured respective time of arrival of said first, second and third transmitted data packets at said subscriber station from said subscriber station to a location service center separate from said base station. - View Dependent Claims (53, 54, 55, 56)
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57. In a wireless CDMA communication system, wherein data packets are communicated from a plurality of transmitters to a receiver using at least one CDMA PN sequence to form a plurality of received data packets, said CDMA communication system including first, second and third antennas spaced apart from each other, a method for determining the actual geographic location of said receiver, said method comprising:
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receiving said first, second and third transmitted data packets at said receiver forming respective first, second and third received data packets; measuring the respective time of arrival using said PN sequence phase relative to at least one of said first, second and third transmitted data packets at said receiver; storing the geographic coordinates of said first, second and third antennas; and computing the actual geographic location of said receiver from said stored geographic coordinates of said first, second and third antennas and said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 79)
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68. In a wireless CDMA communication system, wherein data packets are communicated from a plurality of transmitters to a receiver using at least one CDMA PN sequence to form a plurality of received data packets, said CDMA communication system including first, second and third antennas spaced apart from each other, an apparatus for determining the actual geographic location of said receiver, said apparatus comprising:
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means for receiving said first, second and third transmitted data packets at said receiver forming respective first, second and third received data packets; means for measuring the respective time of arrival using said PN sequence phase relative to at least one of said first, second and third transmitted data packets at said receiver; means for storing the geographic coordinates of said first, second and third antennas; and means for computing the actual geographic location of said receiver from said stored geographic coordinates of said first, second and third antennas and said respective measured time of arrival of said first, second and third transmitted data packets. - View Dependent Claims (69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80)
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Specification