1.

Explain Channel Coding?

Answer»

CHANNEL coding :

  • The data rate for the radio channel is 270 kbps.
  • The data rate is split into 8 full rate or 16 half rate traffic channels, along with signaling channels
  • In order to have the maximum chance for DETECTING and correcting errors, the code is complex in a typical propagation path
  • Forward Error Correction is applied in order to get the speech coder encryption, coding and interleaving in a sophisticated way
  • The data is sent as bursts in 577 mus time slots. Each contains 116 ENCRYPTED bits
  • Every TDMA frame consists of 8 or 16 time slots
  • Transmit time slots are staggered, so that at some instant the mobile station will not receive the same instants while transmitting, which enables the simplifying the filtering requirements
  • At LEAST one spare slot between transmit and receive is available with this scheme.

Channel coding :



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