Method, transceiver, and system for providing wireless communication compatible with 10BASE-T Ethernet

• US 5,636,213 A
• Filed: 12/28/1994
• Issued: 06/03/1997
• Est. Priority Date: 12/28/1994
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Alameh, Rachid M., Eastmond, Bruce C.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US08/365,615
• Time in Patent Office: 888 Days
• Field of Search: 370/27, 370/31, 370/32, 370/32.1, 370/85.3, 370/85.1, 340/825.36, 375/243, 359/189, 455/222, 455/229
• US Class Current: 370/278
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 88/16 Gateway arrangements
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

The present invention provides a method (200), transceiver (100), and system (900) for providing wireless communication compatible with 10BASE-T Ethernet. In the transceiver, an absence detector receives a transmitted signal, determines an absence of the transmitted signal, and passes the absence to an activity detector in order to differentiate between a reflected signal and a received signal in a half duplex system. The activity detector receives the received signal and determines an operation time signal in which the received signal is absent.

Claims

1. A transceiver for providing wireless communications compatible with 10 BASE-T Ethernet, the transceiver comprising:

A) an absence detector/determiner, operably coupled to a transmitted signal, for determining an absence of the transmitted signal and passing the absence to an activity detector in order to differentiate between a reflected signal and a received signal, in a half duplex system; and

B) the activity detector, operably coupled to receive the received signal and to the absence detector, for determining an operation time signal in which the received signal is absent.

2. The transceiver of claim 1, wherein the transceiver further comprises a pulse combiner, operably coupled to receive the received signal and operably coupled to the activity detector, for combining a link integrity pulse with the received signal when the operation time signal indicates to provide a signal compatible with 10BASE-T Ethernet.

3. A method for providing wireless communications compatible with 10 BASE-T Ethernet, the method comprising:

A) differentiating between a reflected signal originating from a local transmitter and a received signal originating from a remote transmitter, in a half duplex system, by determining an absence of the reflected signal originating from a local transmitter; and

B) determining an operation time in which the received signal is absent.

4. The method of claim 3, wherein the method further comprises a final step of combining a link integrity pulse with the received signal during the operation time to provide a signal compatible with 10BASE-T Ethernet.

5. A transceiver for providing wireless communication compatible with 10BASE-T Ethernet, the transceiver comprising:

A) a receiver, operably coupled to receive a first signal and a second signal, for producing a received signal;

B) a squelch, operably coupled to the receiver, for determining a presence of the received signal;

C) an absence determiner, operably coupled to an emitter, for determining an absence of the second signal;

D) a control signal determiner, operably coupled to the squelch and the absence determiner, for providing a control signal based on the presence of the received signal and the absence of the second signal;

E) the emitter, operably coupled to the absence determiner, for receiving a transmitted signal and providing for an emission of the second signal,

F) a squelch gate, operably coupled to the control signal determiner and receiver, for gating the received signal based on the control signal to produce a gated signal;

G) a link integrity pulse generator, operably coupled to the control signal determiner, for generating a link integrity pulse based on the control signal; and

H) a pulse combiner, operably coupled to the squelch gate and the link integrity pulse generator, for adding the link integrity pulse to the gated signal to produce a processed received signal compatible with 10BASE-T Ethernet.

6. The transceiver of claim 5, wherein the first signal and the second signal are transmitted using on-off keyed modulation.

7. The transceiver of claim 5, wherein the first signal and the second signal are optical signals.

8. The transceiver of claim 5, wherein the first signal and the second signal are microwave radio frequency signals.

9. The transceiver of claim 5, wherein the receiver further comprises:

A) a detector for allowing for a collection of at least a first signal, wherein the detector is capable of receiving at least the first signal over an azimuth angle of at least plus and minus 90 degrees; and

B) a receiver, operably coupled to the detector, for converting at least the first signal into the received signal, wherein the received signal is an electrical signal.

10. The transceiver of claim 9, wherein the detector is comprised of at least a first photodiode.

11. The transceiver of claim 9, wherein the detector is comprised of a Schottky barrier diode.

12. The transceiver of claim 5, wherein the absence determiner further comprises:

A) a delay unit for providing a delay with a time duration corresponding to a predetermined mean propagation delay of a reflected signal to the receiver;

B) a packet envelope detector, operably coupled to the delay unit, for determining a presence of the second signal; and

C) an inverter gate, operably coupled to the packet envelope detector, for inverting the presence of the second signal to produce the absence of the second signal.

13. The transceiver of claim 5, wherein the control signal determiner is an AND gate.

14. The transceiver of claim 5, wherein the emitter further comprises:

A) an emitter driver for receiving the transmitted signal and providing an emitter input and an absence determiner input; and

B) a transmitter, operably coupled to the emitter driver, for emitting the second signal over an azimuth angle of at least plus and minus 90 degrees.

15. The transceiver of claim 5, wherein the link integrity pulse generator further comprises:

A) a timer for providing a 16 millisecond clock for a 100 nanosecond pulse generator based on the control signal; and

B) a 100 nanosecond pulse generator, operably coupled to the timer, for generating the link integrity pulse.

16. A method for providing wireless communication compatible with 10BASE-T Ethernet, the method comprising:

A) providing, by a receiver, for a reception of a first signal and a second signal to provide a received signal;

B) determining, by a squelch, a presence of the received signal;

C) determining, by an absence detector/determiner, an absence of the second signal;

D) providing, by a control signal determiner, a control signal based on the presence of the received signal and the absence of the second signal;

E) receiving, by an emitter, a transmitted signal and providing for an emission of the second signal;

F) gating, by a squelch gate, the received signal based on the control signal to provide a gated signal;

G) generating, by a link integrity pulse generator, a link integrity pulse based on the control signal; and

H) adding, by a pulse combiner, the link integrity pulse to the gated signal to provide a processed received signal compatible with 10BASE-T Ethernet.

17. The method of claim 16, wherein the first signal and the second signal are transmitted using on-off keyed modulation.

18. The method of claim 16, wherein the first signal and the second signal are optical signals.

19. The method of claim 16, wherein the first signal and the second signal are microwave radio frequency signals.

20. The method of claim 16, wherein step A) further comprises:

A) allowing, by a detector, for a reception of at least a first signal, wherein the detector is capable of receiving at least the first signal over an azimuth angle of at least plus and minus 90 degrees; and

B) converting, by a receiver, at least the first signal into the received signal, wherein the received signal is an electrical signal.

21. The method of claim 20, wherein the detector is comprised of at least a first photodiode.

22. The method of claim 20, wherein the detector is comprised of a Schottky barrier diode.

23. The method of claim 16, wherein step C) further comprises:

A) providing, by a delay unit, a delay with a time duration corresponding to a predetermined mean propagation delay of a reflected signal to the receiver;

B) determining, by a packet envelope detector, a presence of the second signal; and

C) inverting, by an inverter gate, the presence of the second signal to produce the absence of the second signal.

24. The method of claim 16, wherein the control signal determiner is an AND gate.

25. The method of claim 16, wherein step E) further comprises:

A) receiving, by an emitter driver, the transmitted signal and providing an emitter input and an absence determiner input; and

B) emitting the second signal over an azimuth angle of at least plus and minus 90 degrees.

26. The method of claim 16, wherein step G) further comprises:

A) providing, by a timer, a 16 millisecond clock for a 100 nanosecond pulse generator based on the control signal; and

B) generating, by the 100 nanosecond pulse generator, the link integrity pulse.

27. A system for providing wireless communication compatible with 10BASE-T Ethernet, wherein the wireless communication is between a communication unit and a 10BASE-T Ethernet network, the system comprising:

A) a first transceiver, operably coupled to the communication unit, for receiving a first wireless signal to provide a first Ethernet processed received signal and transmitting a second wireless signal based on a second Ethernet signal;

B) a second transceiver, responsive to the second wireless signal of the first transceiver, for receiving the second wireless signal to provide a third Ethernet signal and transmitting the first wireless signal based on a fourth Ethernet signal; and

C) an Ethernet bridge, operably coupled to the second transceiver, for communicating the third Ethernet signal and the fourth Ethernet signal with a 10BASE-T Ethernet network.

28. The system of claim 27, wherein the communication unit is a portable computer.

29. The system of claim 27, wherein the system further comprises a 10BASE-T Ethernet card, operably coupled to the first transceiver, for converting the first Ethernet signal to a communication unit input and converting a user input to the second Ethernet signal.