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1. 发明授权

US11438202B2 System for demodulating or for blind searching the characteristics of digital telecommunication signals 有权
公开(公告)号：US11438202B2
公开(公告)日：2022-09-06
申请号：US16958779
申请日：2018-12-28
申请人： Avantix
发明人： Thomas Courtat
IPC分类号： H04B1/10 , H04L27/233 , G06N3/08 , H04L25/03 , H04L27/00
摘要： The present invention relates to a system for demodulating or blind searching the characteristics of digital telecommunication signals, characterized in that it comprises at least one hardware architecture or hardware and firmware comprising memories and one or more processing units for implementing a network of specific computation blocks connected together, including a first specialized block of the network estimating at least one filter for acquiring the blind signal, and a second block subsequently producing at least one module for estimating the amplification of the observed signals in order to subsequently assess the other characteristics of the signals observed by the other computation blocks of the network, at least a third specialized computation block producing a decision-making module for computing an error signal and back-propagating the computed errors to each of the preceding residual blocks (“propagate”, “update”).

2. 发明授权

US11516055B2 Error retro-propagation for a chain for the blind demodulation of a digital telecommunication signal 有权
公开(公告)号：US11516055B2
公开(公告)日：2022-11-29
申请号：US16957562
申请日：2018-12-21
申请人： Avantix
发明人： Thomas Courtat
IPC分类号： H04L27/233 , G06N3/04 , G06N3/063 , G06N3/08 , H04L25/03 , H04L27/00 , H04L27/38
摘要： The present invention concerns a real-time method for the blind demodulation of digital telecommunication signals, based on the observation of a sampled version of this signal. The method comprises the following steps: —acquisition, by a sampling, of a first plurality of signals in order to each constitute an input of a network of L processing blocks (G, F, H), also referred to here as “specialized neurons”, each neuron being simulated by the outputs of the preceding block, the first plurality of signals being input into the first block simulating a first neuron of the network in order to generate a plurality of outputs of the first block; each neuron F being simulated by the outputs of an upstream chain G and stimulating a downstream chain H; each set of samples passes through the same processing chain; —the outputs of the last blocks of the network ideally correspond to the demodulated symbols; —addition of a nonlinearity to each of the outputs of the last block of the network making it possible to calculate an error signal and propagation of this error in the reverse direction of the processing chain (“retropropagation”); —estimation, upon receipt of the error by each neuron (i), of a corrective term δθi and updating, in each block, of the value of the parameter θi according to θi+=δθi.

3. 发明授权

US11063739B2 Adaptive synchronizer for a demodulation chain 有权
公开(公告)号：US11063739B2
公开(公告)日：2021-07-13
申请号：US16958771
申请日：2018-12-22
申请人： Avantix
发明人： Thomas Courtat
IPC分类号： H04L27/14 , H04L27/16 , H04L27/22 , H04L7/00
摘要： The present invention relates to an adaptive synchronization device for demodulating a signal in linear modulation (x). The device functions from a sampled version of the signal (x). The device being characterized in that it comprises: —at least one synchronization module (F) comprising: —at least one first sub-module (Fn) arranged to deliver a first output signal (y) from the input signal (x) received at a period (T) less than the value (I) with (B) the bandwidth of the input signal (x); this first sub-module (Fn) is capable of compensating a transmission delay of the input signal (x) by estimation of the propagation delay (τ) between a transmitter and a receiver of a transmission medium; this first sub-module adapts the rate at its output to one sample per symbol; —at least one second sub-module (Fu) arranged to deliver a corrective (δτ) to be applied to the current estimation of the delay (τ), from an error term (w) defining the decision error of the device and the influence of the processings downstream of the first sub-module (F); —at least one correction module of transmission imperfections (H), disposed downstream of the synchronization module (F) and forming a correction chain of transmission imperfections of the first output signal (y) received by this module (H) at the rhythm T, and comprising: —at least one first sub-module (Hn) arranged to deliver a second output signal (z) at the rhythm (T) estimating a stream of emitted symbols (ai); —at least one second sub-module (Hp) configured to deliver the error term (w), by application of a correction to an error term (v) for estimation of symbols to consider the influence of the processings included in the first sub-module (Hn). ( 1 B ) ( I )

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