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Method and device for demodulating GFSK-modulated signals with Q states

A signal and symbol technology, applied in the field of signal transmission, can solve the problems of signal demodulation and incomplete methods

Active Publication Date: 2015-09-09
SAGEM DEFENSE SECURITE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, these methods are not entirely satisfactory, especially due to the hardware requirements of these methods
In particular, these methods are often unable to demodulate signals modulated by frequency shift keying with Gaussian filtering with four states (QGFSK)

Method used

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  • Method and device for demodulating GFSK-modulated signals with Q states

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Embodiment Construction

[0047] Signals modulated by Gaussian filtered frequency shift keying Q-states are received using a receiver 1 which performs the different functions required for such reception. Said receiver 1 may be a transceiver, but to the extent the invention relates to signal reception, the description will refer only to reception via the receiver 1 , and a purely illustrative, albeit typical, operation will be described below.

[0048] The signal is received by means of the radio frequency part 2, which includes: at least one antenna 3 connected to the radio frequency receiving module and the radio frequency processing module and used to receive the signal, a sample-hold circuit 4 for processing the received signal, and an analog - Digitizer 5. The received signal is then processed by a processing stage 6 to be digitally filtered and then, when a rising edge is detected, processed in particular for automatic gain control, which in particular controls the radio frequency part.

[0049] ...

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Abstract

The invention relates to a method for demodulating and decoding at least one received signal modulated with Q states by means of Gaussian frequency-shift keying, said signal being received from a communication channel and comprising a message consisting of message symbols, said method being characterised in that, in order to determine a message symbol: a plurality of possible phase increments are estimated by the application of a linear filter to a plurality of sequences of M products of modulation with Q states by phase-shifting of possible consecutive message symbols; the cumulated phase of the preceding iterations of the method is added to each of said possible phase increments in order to provide an estimated phase; and the message symbol is determined by selecting possible consecutive symbols of which the estimated phase is the closest to the received signal.

Description

technical field [0001] The invention relates to the field of signal transmission, and more precisely relates to the reception of signals modulated by frequency shifting Q state through Gaussian filtering. The invention relates more precisely to a method of demodulating and decoding at least one such received signal. Background technique [0002] Two-state frequency shift modulation is also known as frequency shift keying (Frequency Shift Keying, FSK), where the logic 0 is determined by the frequency f 0 A signal is represented, and a logic 1 is represented by a frequency f 1 signal to represent. Four-state frequency shift modulation is also called quadrature frequency shift keying (Quaternary Frequency Shift Keying, QFSK), and each of the four frequencies distributed over the bandwidth is associated with one symbol. [0003] In frequency shift keying modulation for continuous phases, a voltage controlled oscillator controls a bit signal. In this implementation, there is ...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/10
CPCH04L25/03178H04L27/10H03D3/10
Inventor 阿兰·乔帝尼
Owner SAGEM DEFENSE SECURITE SA
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