Complexity Analysis of Iterative Decoders in Mobile Communication Systems
Keywords:
Decoding complexity, bit error rate, hybrid Turbo codes, iterative decoders.Abstract
Turbo Convolutional Codes (TCC) and Low
Density Parity Check (LDPC) codes, based on iterative
decoders, are widely used to reduce bit error rate in mobile
communication systems. The key implementation issue for these
codes is the overall higher decoding complexity. Modified
Turbo codes are low complexity turbo-like codes with error
performance which is equivalent to that of Turbo codes. In this
paper, decoding complexity of LDPC, TCC and various low
complexity modified Turbo codes, such as Low Complexity
Hybrid Turbo Codes (LCHTC) and Improved Low Complexity
Hybrid Turbo Codes (ILCHTC), are presented. Further,
modified Turbo codes are compared with TCC on the basis of
error performance and decoding complexity. It is shown that
the error performance of modified Turbo codes is almost
equivalent to that of TCC. Moreover, modified Turbo codes
require significantly lower decoding complexity than that of
TCC and LDPC codes.
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