interesante informacion, la voy a leer con calma, gracias.
de todas formas solo una puntualizacion y es que crc no corrige y viterbi si, ademas viterbi es un codigo convolucional y de complejidad bastante superior a CRC, te dejo la cita:
Viterbi / ISI: This is the single most important stuff people are currently working on. This can either fail the project or make it a success. The mission is to get better (error-free) bit data out of the GSM signal. We are currently suffering from high bit errors.
http://wiki.thc.org/gsm#head-6099ba2aeccefba0388e18ac648d2191c8f76e2f