Method and device for receiving a signal the phase or frequency of which is modulated by a sequence of two-state symbols

Patent metadata

Field	Value
Publication number	US-10454730-B2
Application number	US-201615739717-A
Country	US
Kind code	B2
Filing date	Jun 22, 2016
Priority date	Jun 26, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A method allowing a receiver device of a wireless communication system to receive a useful signal emitted by an emitter device. The useful signal corresponding to a signal, the phase or frequency of which is modulated by a sequence of two-state symbols corresponding to a sequence of binary data. A temporal envelope of the useful signal is detected and compared to a preset threshold value. Transitions between consecutive useful-signal symbols are detected, on the basis of the result of the comparison. A sequence of binary data is extracted from the useful signal depending on the detected transitions.

First claim

The invention claimed is:

1. A method for receiving, by a receiver device of a wireless communication system, of a useful signal transmitted by a transmitter device, the method comprising steps of:
detecting a time-domain envelope of the useful signal, the useful signal corresponding to a signal that is phase-modulated or frequency-modulated by a sequence of two-state symbols corresponding to a binary data sequence;
comparing the detected time-domain envelope with a predetermined threshold value;
detecting transitions between consecutive symbols of the useful signal, a transition between two consecutive symbols, respective states of which are different, being detected when the detected time-domain envelope is less than the predetermined threshold value, and a transition between two consecutive symbols, the respective states of which are identical, being detected when the detected time-domain envelope is greater than the predetermined threshold value; and
extracting the binary data sequence from the useful signal as a function of detected transitions between different states and as a function of detected transitions between identical states.

2. The reception method as claimed in claim 1 , wherein the symbols of a sequence are transmitted at a symbol period; and the reception method further comprises steps of determining decision instants separated by the symbol period; and detecting the transitions between consecutive symbols of the useful signal as a function of the decision instants.

3. The reception method as claimed in claim 2 , wherein the decision instants are determined as a function of at least one instant of detection of a transition between different states.

4. The reception method as claimed in claim 2 , wherein the decision instants correspond to instants for which the detected time-domain envelope is greater than the predetermined threshold value; wherein the transition between different states is detected when the detected time-domain envelope becomes less than the predetermined threshold value between two consecutive decision instants; and wherein the transition between identical states is detected when the detected time-domain envelope remains greater than the predetermined threshold value between two consecutive decision instants.

5. The reception method as claimed in claim 1 , wherein the useful signal is an ultra-narrowband signal.

6. The reception method as claimed in claim 1 , wherein the useful signal is a BPSK or DBPSK signal.

7. The reception method as claimed in claim 1 , wherein the useful signal is a GFSK or DGFSK signal.

8. The reception method as claimed in claim 1 , wherein the time-domain envelope of the useful signal is detected and compared to the predetermined threshold value by the receiver device to receive amplitude-modulated signals.

9. The reception method as claimed in claim 1 , wherein the time-domain envelope of the useful signal is detected directly at an output of a low-noise amplifier of the receiver device.

10. A receiver device of a wireless communication system to receive a useful signal transmitted by a transmitter device, the receiver device comprising a processing circuit configured to:
detect a time-domain envelope of the useful signal, the useful signal corresponding to a signal that is phase-modulated or frequency-modulated by a sequence of two-state symbols corresponding to a binary data sequence;
compare the detected time-domain envelope with a predetermined threshold value;
detect transitions between consecutive symbols of the useful signal, a transition between two consecutive symbols, respective states of which are different, is detected when the detected time-domain envelope is less than the predetermined threshold value, and a transition between two consecutive symbols, the respective states of which are identical, is detected when the detected time-domain envelope is greater than the predetermined threshold value; and
extract the binary data sequence from the useful signal as a function of detected transitions between different states and as a function of detected transitions between identical states.

11. The receiver device as claimed in claim 10 , wherein the processing circuit is configured to carry out time-envelope detection of the useful signal directly at an output of a low-noise amplifier of the receiver device.

12. The receiver device as claimed in claim 10 , wherein the processing circuit comprises a processor and a memory.

13. The receiver device as claimed in claim 10 , wherein the processing circuit comprises a programmable logic circuit.

Assignees

• Sigfox

Inventors

• Chalbos Nicolas
• Hubert Loïc
• Fourtet Christophe

Classifications

• H04L27/1563

  using transition or level detection · CPC title

• H04L27/2335 Primary

  using temporal properties of the received signal · CPC title

• H04L27/2035

  using a single or unspecified number of carriers · CPC title

• H04L27/20

  Modulator circuits; Transmitter circuits · CPC title

• H04L27/2071

  in which the data are represented by the carrier phase, e.g. systems with differential coding · CPC title