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Method, device, wireless transceiver and computer for providing collision detection in wireless carrier sense multiple access systems

  • US 5,940,400 A
  • Filed: 11/06/1996
  • Issued: 08/17/1999
  • Est. Priority Date: 11/06/1996
  • Status: Expired due to Term
First Claim
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1. A device for providing collision detection in a wireless carrier sense multiple access system, comprising:

  • A) a detector, for detecting received electromagnetic signals;

    B) a receiver, coupled to the detector, for receiving electromagnetic signals from the detector and converting the electromagnetic signals to binary data signals;

    C) a collision detector, coupled to the receiver and to receive an emitter control signal, for multiplying and filtering the binary data signals from the receiver and the emitter control signal and then comparing filtered multiplied signals to a predetermined threshold;

    D) a signal presence indicator, coupled to the receiver, for indicating a presence of a detected signal;

    E) a delay unit, coupled to receive the emitter control signal, for delaying the emitter control signal to correlate envelope correlation between a received and transmitted signal;

    F) a packet envelope detector, coupled to the delay unit, for detecting a packet envelope;

    G) the emitter, for receiving an emitter control signal and transmitting electromagnetic signals;

    H) a control logic unit, coupled to the packet envelope detector, the signal presence indicator and the collision detector, for controlling a squelch gate and for controlling an oscillator that generates a valid Ethernet signal;

    I) the squelch gate, coupled to the collision detector and the control logic unit, for muting receiver output when one of;

    the emitter is active and a signal is absent; and

    J) an oscillator unit, coupled to the squelch gate and the control unit, for providing the valid Ethernet signal when collision occurs,wherein the oscillator unit includes;

    K) an oscillator, coupled to the control logic unit, for providing a waveform when collision occurs; and

    L) a summer, coupled to the oscillator and the squelch gate, for combining the waveform and an output of the squelch gate to provide the valid Ethernet signal.

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