Created
November 27, 2016 03:33
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CRC16 python class and implementation.
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import random | |
class CRC16: | |
#codificacion de bits basado en el estandar CRC-12 | |
def __init__(self, word): | |
self.word = word | |
print("La trama a transmitir es:\n", bin(int(self.word,2))) | |
G = 0b11000000000000101 #Polinomio generador G(x) | |
def mod2(self,data): | |
Glist = [1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1] | |
Wordlist = [int(d) for d in str(bin(data))[2:]] | |
while len(Glist) <= len(Wordlist) and Wordlist: | |
if Wordlist[0] == Glist[0]: | |
del Wordlist[0] | |
for j in range(len(Glist)-1): | |
Wordlist[j] ^= Glist[j+1] | |
while Wordlist and Wordlist[0] == 0: | |
del Wordlist[0] | |
if not Wordlist: | |
return 0 | |
else: | |
CRCstring = ''.join(str(e) for e in Wordlist) | |
CRCdata = int(CRCstring,2) | |
return CRCdata | |
def M(self): | |
stringdata = self.word + '0000000000000000' #Agregar 13 bits 0 a la palabra | |
dataM = int(stringdata,2) #Convertirlos a binarios | |
CRC = self.mod2(dataM) #Operacion Mod2 | |
CRCfix = format(CRC, 'b').zfill(16) | |
Tstring = str(self.word) + CRCfix #Palabra binaria | |
T = int(Tstring,2) | |
return T | |
def verificar(word): | |
if Trama.mod2(word) == 0: | |
print("La transmisión se realizó sin errores") | |
else: | |
print("Hubo errores en la transmisión") | |
#Parte principal del programa | |
Wordinput = input("Ingrese la trama binaria:\n") | |
Trama = CRC16(Wordinput) #Objeto de la clase CRC16 | |
print("La palabra códificada es: \n", bin(Trama.M())) | |
biterror = random.randint(0,1) | |
wordrecived = biterror + Trama.M() | |
print("La palabra recibida es:\n",bin(wordrecived)) | |
verificar(wordrecived) |
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