System for transmitting multiple pulses PPM control signal to wi

Details System for transmitting multiple pulses PPM control signal to wi System for transmitting multiple pulses PPM control signal to wi

1995-03-17

1997-11-25

Lee, Thomas C.

Multiplex communications

Wide area network

Packet switching

39520014, 39520019, 370213, 370319, 370913, G06F 1300

Patent

active

056921276

ABSTRACT:
A method and apparatus for detecting and indicating a collision on a wireless channel are provided. According to the method, data is transmitted over the wireless channel using pulse position modulation. The channel is monitored during each pulse position modulation frame to determine whether a pulse occurs during more than one pulse window of the pulse position modulation frame. If a pulse occurs during more than one pulse window of a pulse position modulation frame, then the devices on the wireless channel determine that a collision has occurred. A transceiver is disclosed for connecting a device to a wire-based network via a wireless connection. The device and transceiver communicate over the wireless connection using pulse position modulation. If a collision occurs on the wire-based network, then the transceiver transmits to the device a signal in which pulses are asserted during more than one pulse window of a pulse position modulation frame. The signal, which violates standard pulse position modulation rules, indicates to the device that a collision occurred.

REFERENCES:
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patent: 5379290 (1995-01-01), Kleijne
patent: 5390181 (1995-02-01), Campbell et al.
patent: 5422887 (1995-06-01), Diepstraten et al.
Elmirghani and Cryan, "Indoor Infrared wireless networks utilising PPM CDMA", Aug. 1994, pp. 334-337.
Sugiyama and Nosu, "MPPM: A Method for Improving the Band Utilization Efficiency in Optical PPM", 1989, pp. 465-472.
Barry, John R., Kahn, Joseph M., Lee, Edward A., and Messerschmitt, David g., High-Speed Nondirective Optical Communication for Wireless Networks, IEEE Network Magazine, Nov. 1991, pp. 44-54.
International Search Report (PCT Rule 44.1), from the International Searching Autority, dated Nov. 9, 1996.

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