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Method for generating signal comprising time successive chirp, method for estimating carrier symbol using such signal, computer program product and corresponding apparatus

A technology of information symbols and time, applied in the field of data transmission, can solve problems such as management

Pending Publication Date: 2022-03-01
UNIV DE BORDEAUX +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, it seems difficult to manage such conflicts with the modulation used

Method used

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  • Method for generating signal comprising time successive chirp, method for estimating carrier symbol using such signal, computer program product and corresponding apparatus
  • Method for generating signal comprising time successive chirp, method for estimating carrier symbol using such signal, computer program product and corresponding apparatus
  • Method for generating signal comprising time successive chirp, method for estimating carrier symbol using such signal, computer program product and corresponding apparatus

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Embodiment Construction

[0049] The general principle of the invention is based on the use of differential encoding of the information symbols to be transmitted in order to obtain modulation symbols that will be efficiently modulated for generating the chirp of the transmitted signal. Such differential encoding is associated with corresponding differential decoding on the receiver side, making it possible in the presence of time and / or frequency synchronization errors and in the presence of collisions between data frames (intra-system or inter-system collisions) Improved data estimation performance, as detailed below.

[0050] now refer to Figure 1a , Figure 1b and Figure 1c Modulation of the fundamental chirp via a cyclic arrangement of variations in the instantaneous frequency of the fundamental chirp is presented.

[0051] More specifically, chirps are designed to be transmitted over a carrier frequency. However, the chirp is represented at baseband by its complex envelope. for This comple...

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Abstract

The invention relates to a method for generating a signal comprising a time successive modulated chirp. Modulating a cyclic permutation of the pattern of variation of the instantaneous frequency corresponding to the base chirp within the symbol time Ts, said cyclic permutation being obtained by s multiplied by a time offset of the base time period Tc, such that M * Tc = Ts. Such a method comprises performing differential encoding (E200) between a modulation symbol associated, on the one hand, with a chirp preceding the given one of the time-sequential chirps and, on the other hand, a given information symbol of a constellation of M symbols, to generate a given one of the time-sequential chirps, the differential code transmits a given modulation symbol; and modulating (E210) a base chirp based on the given modulation symbol, thereby generating the given chirp.

Description

technical field [0001] The field of the invention is that of data transmission via the use of waveforms known as "chirped" waveforms. [0002] The invention relates more particularly to a method for generating and processing such waveforms, which has improved performance compared to the prior art, but comparable implementation complexity. [0003] This waveform is used to transmit data via different types of communication links, such as acoustic communication links, radio frequency communication links, etc. For example, dedicated for low-power transmissions by objects connected via radio frequency links technology uses this waveform. Accordingly, the invention is particularly, but not exclusively, applicable to all areas of personal and professional life in which the connected object is present. For example, areas such as health, sports, home applications (security, home appliances, etc.), object tracking, etc. Background technique [0004] In the rest of this document,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04L27/10
CPCH04B1/69H04L27/103H04B2001/6912
Inventor 纪尧姆·费雷
Owner UNIV DE BORDEAUX