Telefonaktiebolaget Lm Ericsson (publ)

Per-Olof Gerhard Gustavsson

Bo A Morwing

Dan Rutger Weinholt

Bengt Lennart Andersson

Bo Anders Morwing

Philip M Charas

Method of communicating digital data in which frames () are transmitted cyclically whereby a first number of symbols is transmitted according to a first keying mode (II) using a first constellation, and a second number of symbols is transmitted according to a second keying mode (L) using a second constellation. The first and second keying modes (H, L) are used at predetermined positions in the frame, whereby both the symbols according to the first and second keying mode carry information under at least an operative traffic phase.

Embedded keying

According to the invention, a fade margin test value for a radio link is calculated according to a routine whereby the output power of the transmitter is gradually decreased until the forward error correction activity FCA reaches a predetermined value, FCA , whereupon the output power is regulated back to a duty level again. The reduction in output power is performed when the link is operating in a normal way, i.e. while communication may be transmitted on the link. Subsequently, a fade margin test value FM is determined as the ratio related to the nominal output power and the output power corresponding to the predetermined forward error correction value FCA at the reduced power level. Finally, the output power is increased to nominal output power.

Fade margin test

Navigation system

Method and apparatus for preventing the response of a radar beacon to

A device for automatic transmission of information includes an information emitter and an information seeker wherein the information is transmitted from the emitter to the seeker in response to an interrogating signal from the information seeker. The emitter relies for transmission on energy which is extracted from the interrogating signal. The emitter is provided with several resonant circuits, each of which generates an information signal component. The information carrying signal comprises a multitude of such signal components. From the information carrying signal the information is captured by detection in the information seeker of the respective information signal components.

Device for transmission of information from an information emitter to an

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Pixbo, Sweden

Per-Olof Gerhard Gustavsson