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Scanning method for receiving a transmission in a communication system with slow frequency hopping and coding

  • US 5,471,503 A
  • Filed: 12/29/1992
  • Issued: 11/28/1995
  • Est. Priority Date: 12/29/1992
  • Status: Expired due to Term
First Claim
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1. In a decentralized communication system for communicating between two or more of a plurality of stations each of which includes a transmitter and a receiver, a method for detecting and receiving a packet of data transmitted by an arbitrary transmitting station of said plurality of stations that first encodes and arranges the packet into a plurality of N segments, and then transmits the packets using frequency hopping in a predetermined channel sequence of N radio frequencies, said method comprising the steps of:

  • (a) in an arbitrary receiving station that is initially unsynchronized with said transmitting station, scanning a subset of frequencies of said N radio frequencies, said subset including a first plurality p (p<

    N) of frequencies in said predetermined channel sequence wherein a scan time for each frequency of said subset is substantially less than the time necessary to receive a segment;

    (b) testing for the presence of a transmission on each of said p scanned frequencies;

    (c) if a transmission is detected on one of said p scanned frequencies, then performing a receiving step (d), otherwise returning to step (a); and

    (d) if a transmission is detected in the step (c), then synchronizing the receiving station with the transmitted packet, receiving the segment, hopping to the next frequency in the predetermined channel sequence and receiving a segment on that channel and continuing to hop and receive until the Nth segment has been received, otherwise returning to step (a).

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