Enabling & Support

Method, apparatuses and system for asynchronous spread-spectrum communication

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ESA / Enabling & Support / Space Engineering & Technology
542 - Abstract of the offer:
The European Space Agency (ESA) has developed means to perform asynchronous spread-spectrum communication. This technology can be used for a wide range of communication systems such as: mobile broadband data services, public safety, emergency alerting, traffic monitoring, environmental monitoring, vehicle information or location-awareness services. Licence agreement collaboration is sought.

Description of the offer:

The offered technology includes the method, several apparatuses and a system for asynchronous spread-spectrum communication.

The developed method of receiving data packets asynchronously transmitted by a plurality of user terminals is characterized by including a step for cancelling interferences:

  1. Storing received signal samples in a processing memory
  2. Performing packet identification on the signals stored in the processing memory within a sliding processing window
  3. Selecting one among the identified packets, and cancelling the interference of the packet with the other received data inside the sliding processing window
  4. Repeating step c) for all or part of the packets identified at step b)
  5. Shifting the processing window by a shifting step which is shorter than the overall length of said processing window

Part of the technology is a gateway receiver for receiving data packets asynchronously transmitted by a plurality of user terminals, comprising:

  • A front-end unit for demodulating and digitising the received signals
  • A data processing unit for performing spread-spectrum demodulation, decoding and interference cancellation

Innovations and advantages:

The developed technology provides a way to very efficiently and reliably transmit small size data packets with low duty cycle in quasi real-time, thereby supporting a large user community of low-cost fixed and mobile terminals, minimising the associated signaling overhead and reusing as much as possible existing waveform standards for mass-market applications.

Domain of application:

This technology has a wide domain of application; in particular, the proposed communication technique has a high potential in applications for L/S-bands such as:

  • Vehicle telemetry services (road tax, insurance, road assistance)
  • Data services
  • Mobile satellite two-way communication
  • Mobile broadband
  • Public safety and first-responder services
  • Issue of distress beacons in the event of an accident
  • Emergency alerting
  • Monitoring of traffic flows
  • Environmental monitoring
  • Combination with GNSS applications
  • Location-aware services
  • Delivering of real time information on the road traffic
  • Automatic paying of highway or city toll
  • Telephone interconnect and other equipment
  • Mobile communications, pagers and cellular radio

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