Enabling & Support

Coded Digital Modulation for Communication Systems

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ESA / Enabling & Support / Space Engineering & Technology
469 - Abstract:
The  following invention proposes a technology to improve digital modulation spectral efficiency, while keeping high power efficiency. The growing demand for high data point-to-point and point-to-multipoint link in satellite systems can be supported by this. For instance, the coded modulation scheme provides a considerable performance advantage for future satellite multi-media and broadcasting systems. Licence agreements are sought.


The European Space Agency introduces a class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations. The invention optimizes the transmission of digitally modulated signals on non-linear channels. Satellite systems are likely to require higher bit rates, thus extracting as many bits per second as possible from the available bandwidth becomes a critical need. This invention combines coding efficiency with the required coding rate flexibility and simple matching to the demodulator.

Scattering diagram of XDAGC-sampled at 10
Scattering diagram of XDAGC-sampled at 10

Innovations and advantages:

Improving transmission efficiency with good robustness.

  • Reducing service cost with minimum energy per bit.
  • Enabling faster wireless connection speed and higher data transfer rate than its predecessors.
  • Decreasing the bit error rate (BER) due to simple decoder implementation.
  • Improving spectral density for high speed satellite links.

Domain of application:

The invention can be applied to radiofrequency communications and broadcasting, which includes applications such as:

  • Bi-directional radio communications
  • Cell phones
  • Wireless networks
  • GPS systems
  • Garage door openers
  • Wireless keyboards and headsets
  • Radio receivers
  • Satellite and broadcast television.

Another application is in the transmission of digital information over point-to-point channels such as copper wires, optical fibers, wireless communication channels, and storage media.

This invention is essential to both DVB-S2 and DVB-S2X standards.

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