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FORWARD ERROR CORRECTION (FEC) CODING IN THE GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS (GSM)

FORWARD ERROR CORRECTION (FEC) CODING IN THE GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS (GSM). Dai, Shuai (Jason) Sun, Chang (Fred) Zhuang, Fuxin (Henry) March 17, 2011. Stages of Channel Coding. BLOCK CODING FOR LOGICAL CHANNELS.

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FORWARD ERROR CORRECTION (FEC) CODING IN THE GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS (GSM)

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  1. FORWARD ERROR CORRECTION (FEC) CODING IN THE GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS (GSM) Dai, Shuai (Jason) Sun, Chang (Fred) Zhuang, Fuxin (Henry) March 17, 2011

  2. Stages of Channel Coding

  3. BLOCK CODING FOR LOGICAL CHANNELS

  4. Block coding has supplemented the data with redundancy bits (parity bits) for error detection • Convolutional coding is to calculate additional redundancy for error correction • A convolutional code is described by three integers:, v, k and K. • Code rate = k/v; in GSM: rGSM=1/vGSM=1/2; CONVOLUTIONAL CODING

  5. INTERLEAVING • Errors tend to occur in bursts. • Distributing errors evenly in time improve the efficiency of error detection and correction. • Interleaving Depth: the number of bursts over which a codeword is spread.

  6. FEC in GSM Q&A Reference: GSM : architecture, protocols and services / Jörg Eberspächer ... [et al.] 3rd edition Wiley, 2009

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