A new efficient dynamic-iterative technique for turbo decoders

Turbo coding has been adopted by the International Telecommunication Union as a channel coding standard for third-generation wireless high-speed data services. Turbo decoders consume a large amount of energy due to the iterative decoding feature. This paper presents a new dynamic-iterative technique that reduces the number of iterations in a turbo decoder at both improved and distorted channel conditions. Simulations show that the proposed technique reduces the number of decoding iterations by about 40% compared to the static-iterative case, over a signal-to-noise ratio range of -1 to 2 dB. It is also shown that the iteration reduction given by the new method is superior to those of the other low-complexity dynamic-iterative methods, with a decoding performance close to the best of these methods.