Claims
- 1. A method for providing a wireless exchange of data between a stationary station and at least one transmitter/receiver disposed on at least one respective object moving relative to the stationary station, the method comprising the steps of:
- (a) setting a transmission profile for each of a plurality of transmitting antennas at the stationary station determined by a vectorial weighing process using a beam-forming network and controlled by a processor;
- (b) setting a reception profile, under the control of the processor, for each of a plurality of receiving antennas at the stationary station corresponding to a respective one of the transmitting antennas, the reception profile for each of the plurality of receiving antennas corresponding to the transmission profile of the respective one of the plurality of transmitting antennas;
- (c) transmitting, from each of the plurality of transmitting antennas at the stationary station, an original signal to a respective one of the at least one transmitter/receiver using the transmission profile, the transmission profile creating a damping effect on the original signal, producing a damped original signal;
- (d) transmitting, in response to the damped original signal, a reply signal from the at least one transmitter/receiver, the reply signal having a carrier frequency and level which are equal to a carrier frequency and level, respectively, of the damped original signal; and
- (e) receiving the reply signal by at least one of the plurality of receiving antennas at the stationary station using the reception profile, creating a damping effect on the reply signal;
- wherein the damping effect on the original signal and the damping effect on the reply signal are multiplicative in effect.
- 2. The method according to claim 1, wherein step (a) includes the steps of transmitting a first original signal from one of the plurality of transmitters at a first carrier frequency, and transmitting a second original signal from an adjacent one of the plurality of transmitters at a second carrier frequency, and wherein the method further comprises the step of discarding any reply signal received at one of the plurality of receiving antennas corresponding to the one of the plurality of transmitting antennas when said any reply signal is not received at the first carrier frequency.
- 3. The method according to claim 2, wherein the plurality of transmitting antennas includes at least four transmitting antennas, and each of the at least four transmitting antennas transmits at a different carrier frequency.
- 4. A system for providing a wireless exchange of data, the system comprising:
- (a) a stationary station including at least one processor and a plurality of antenna arrays, each of the plurality of antenna arrays including a plurality of transmitting antennas and a plurality of receiving antennas, each of the plurality of transmitting antennas corresponding to a respective one of the plurality of receiving antennas, each of the plurality of transmitting and receiving antennas including a beam-forming network, the at least one processor setting a transmission profile of each of the plurality of transmitting antennas corresponding to a reception profile of each of the plurality of receiving antennas, each of the plurality of transmitting antennas transmitting a signal using the transmission profile set by the at least one processor, the transmission profile creating a damping effect on the signal, producing a damped signal; and
- (b) at least one transmitter/receiver located on at least one respective object moving relative to the stationary station, the at least one transmitter/receiver receiving the damped signal and transmitting, in response to the signal, a reply signal, the reply signal having a carrier frequency and level, respectively, of the damped signal, at least one of the plurality of receiving antennas receiving the reply signal using the reception profile, the reception profile creating a damping effect on the reply signal;
- wherein the damping effect on the signal and the damping effect on the reply signal are multiplicative in effect.
- 5. The system according to claim 4, wherein each of the plurality of transmitting antennas is controlled by a respective processor of the at least one processor and is arranged adjacent to its respective one of the plurality of receiving antennas, the respective one of the plurality of receiving antennas also being controlled by the respective processor of the at least one processor.
- 6. The system according to claim 5, wherein a signal transmitted from one of the plurality of transmitters is at a first carrier frequency, and a signal transmitted from an adjacent one of the plurality of transmitters is at a second carrier frequency.
- 7. The system according to claim 5, wherein the at least one object includes a plurality of vehicles traveling in respective lanes of a road.
Priority Claims (1)
Number |
Date |
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Kind |
43 18 109.0 |
Jun 1993 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 08/252,461 filed on Jun. 1, 1994, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (11)
Number |
Date |
Country |
0 002 469 |
Jun 1979 |
EPX |
0 401 192 |
Dec 1990 |
EPX |
0 407 243 |
Jan 1991 |
EPX |
0 416 692 |
Mar 1991 |
EPX |
0 472 018 |
Feb 1992 |
EPX |
0 567 889 |
Nov 1993 |
EPX |
0 578 060 |
Jan 1994 |
EPX |
0 588 045 |
Mar 1994 |
EPX |
0 585 718 |
Mar 1994 |
EPX |
4107803 |
Sep 1992 |
DEX |
41 07 803 |
Sep 1992 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Komanecky et al., IVHS Applications of Smart Cards, Society of Automotive Engineers, Inc., Oct. 1, 1991; pp. 977-987. |
Continuations (1)
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Number |
Date |
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Parent |
252461 |
Jun 1994 |
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