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Digitalisation d'un signal -![[Pièces jointes/Pasted image 20230921090301.png]] + +![transmission_process-digitalisation_signal.png](medias%2Ftransmission_process-digitalisation_signal.png) + ## Quantification -résolution: $2^{\text{nbits}}$ +Résolution : $2^{\text{nbits}}$ >[!example] MATLAB (A2) ->![[Pièces jointes/Pasted image 20231114203300.png]] ->![[Pièces jointes/Pasted image 20231114203320.png]] +>![transmission_process-matlab-quantification.png](medias%2Ftransmission_process-matlab-quantification.png) +>![transmission_process-matlab-quantification_params.png](medias%2Ftransmission_process-matlab-quantification_params.png) @@ -26,7 +28,7 @@ résolution: $2^{\text{nbits}}$ ### Déquantification >[!example] MATLAB (A2) ->![[Pièces jointes/Pasted image 20231114203411.png]] +>![transmission_process-matlab-dequantification.png](medias%2Ftransmission_process-matlab-dequantification.png) >$$\begin{align} \\ \text{Add: } \frac{\frac{Q_{P}}{2^{double(Q_{Nb})-1}}}{2} @@ -34,7 +36,7 @@ résolution: $2^{\text{nbits}}$ \end{align}$$ > > ->![[Pièces jointes/Pasted image 20231114203425.png]] +>![transmission_process-matlab-dequantification_params.png](medias%2Ftransmission_process-matlab-dequantification_params.png) ## Échantillonnage @@ -42,13 +44,13 @@ Mesure à chaque clock $f_{s} = 2*f_{out}$ $f_{s}$ : Fréquence de sample >[!example] MATLAB (A1) ->![[Pièces jointes/Pasted image 20231114203111.png]] +>![transmission_process-matlab-echantiollnage.png](medias%2Ftransmission_process-matlab-echantiollnage.png) ### Reconstruction Passe-bas avec $f_{c} = \frac{f_{s}}{2}$ $f_{c}$ : Fréquence de coupure >[!example] MATLAB (A1) ->![[Pièces jointes/Pasted image 20231114203129.png]] +>![transmission_process-matlab-reconstruction.png](medias%2Ftransmission_process-matlab-reconstruction.png) @@ -60,14 +62,17 @@ $f_{c}$ : Fréquence de coupure Automatic Repeat reQuest Technique pour contrôler les erreurs en communication bidirectionnelle Avec un canal de retour comme "stop & go" ou "TCP" -![[Pièces jointes/Pasted image 20231114204351.png]] + +![transmission_process-controle_erreur-arq.png](medias%2Ftransmission_process-controle_erreur-arq.png) ## FEC Forward Error Coding -Technique pour contrôler les erreurs en communication monodirectionnelle : -- Envoie de 3 fois ou n (impair) fois chaque bit +Technique pour contrôler les erreurs en communication monodirectionnelle : +- Envoi de 3 fois ou n (impair) fois chaque bit - Avec code de Hamming - ![[Pièces jointes/Pasted image 20231114204109.png]] + +![transmission_process-controle_erreur-fec.png](medias%2Ftransmission_process-controle_erreur-fec.png) + Exemple FEC 1/3 (1 bit de donnée pour 3 bit transmit) $E_{0}$ : 0 bit faux $E_{1}$ : 1 bit faux @@ -88,7 +93,7 @@ Technique pour contrôler les erreurs en communication monodirectionnelle : |F|J|F|Faux|$P(E_{2})$| |F|F|J|Faux|$P(E_{2})$| |F|F|F|Faux|$P(E_{3})$| -Pour la probabilité d'erreur total, on additionne les faux résultats. Soit : +Pour la probabilité d'erreur total, on additionne les faux résultats. Soit : $$\begin{align} P(E) &= P(E_{2}) + P(E_{2}) + P(E_{2}) +P(E_{3}) \\ &= 3\cdot P(E_{2})+P(E_{3}) \\ @@ -98,10 +103,10 @@ P(E) &= P(E_{2}) + P(E_{2}) + P(E_{2}) +P(E_{3}) \\ ### MATLAB (B1-B2) >[!example] Codage du canal ->![[Pièces jointes/Pasted image 20231114212419.png]] +>![transmission_process-matlab-codage_canal.png](medias%2Ftransmission_process-matlab-codage_canal.png) >[!example] Décodage du canal ->![[Pièces jointes/Pasted image 20231114212538.png]] +>![transmission_process-matlab-decodage_canal.png](medias%2Ftransmission_process-matlab-decodage_canal.png) @@ -111,26 +116,31 @@ P(E) &= P(E_{2}) + P(E_{2}) + P(E_{2}) +P(E_{3}) \\ Bits $\to$ Symbol -Symbol: +Symbol : Représentation d'un ou plusieurs bits dans le monde réel ## BPSK 2 symboles - 1 bit / symbole -![[Pièces jointes/Pasted image 20231114205027.png]] + +![transmission_process-codage_physique-bpsk.png](medias%2Ftransmission_process-codage_physique-bpsk.png) ## QPSK 4 symboles - 2 bits / symbole -![[Pièces jointes/Pasted image 20231114205105.png]] + +![transmission_process-codage_physique-qpsk.png](medias%2Ftransmission_process-codage_physique-qpsk.png) # Transmission Radio ## AM Modulation de l'Amplitude -![[Pièces jointes/Pasted image 20231114210448.png]] + +![transmission_process-transmission_radio-am.png](medias%2Ftransmission_process-transmission_radio-am.png) ## FM Modulation de la Fréquence -![[Pièces jointes/Pasted image 20231114210510.png]] + +![transmission_process-transmission_radio-fm.png](medias%2Ftransmission_process-transmission_radio-fm.png) ## PM Modulation de la Phase -![[Pièces jointes/Pasted image 20231114210537.png]] + +![transmission_process-transmission_radio-pm.png](medias%2Ftransmission_process-transmission_radio-pm.png)