Performance of Hybrid Automatic Repeat Request Scheme with Turbo Codes

摘要

The introduction of turbo-codes in digital communication systems represents a step towards more reliable data transmissions. The reliability can be enhanced by combining the codes with automatic repeat request (ARQ), known as hybrid-ARQ (HARQ) This paper provides analysis and computer simulations in MATLAB for evaluating the performance of HARQ schemes using turbo-codes as the FEC. The performance of the scheme is analyzed in term of bit error rate (BER) and bit energy to noise ratio spectral density (E_b/N_0). Various parameters that influence the performance were investigated. Puncturing effects, number of iterations, decoding algorithm, size of packets and constrain length have been analyzed and evaluated to determine the effects and performances.