Publication

Proof of Concept of QCSP Frames in Earth-to-LEO Satellite Transmission

2026

Abstract

In this paper, we report on a multi-site experiment involving the transmission of a new type of frame for IoT, called Quasi-Cyclic Short Packet (QCSP). QCSP frames are characterized by the combination of a q-ary modulation using Cyclic Code Shift Keying (CCSK) and a q-ary non-binary Error Correction Code (ECC). A QCSP frame does not contain a preamble, making it energy-optimal since no resources are wasted for signaling. However, this absence poses a significant challenge for detection and synchronization, particularly in the case of a LEO satellite, which is subject to strong and fast-varying Doppler shifts. Our experiment demonstrates that such transmission can be successfully recovered.

Official source

https://infoscience.epfl.ch/entities/publication/6c892b4b-2af2-4022-8072-9982cd2f2939

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6c892b4b-2af2-4022-8072-9982cd2f2939

About this result

Related concepts (21)

Communications satellite

A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite.

Satellite

A satellite or artificial satellite is an object intentionally placed into orbit around a celestial body. Satellites have a variety of uses, including communication relay, weather forecasting, navigation (GPS), broadcasting, scientific research, and Earth observation. Additional military uses are reconnaissance, early warning, signals intelligence and, potentially, weapon delivery. Other satellites include the final rocket stages that place satellites in orbit and formerly useful satellites that later become defunct.

Satellite constellation

A satellite constellation is a group of artificial satellites working together as a system. Unlike a single satellite, a constellation can provide permanent global or near-global coverage, such that at any time everywhere on Earth at least one satellite is visible. Satellites are typically placed in sets of complementary orbital planes and connect to globally distributed ground stations. They may also use inter-satellite communication.