A New Early Termination Scheme of Iterative Turbo Decoding Using Decoding Threshold

Although many stopping methods of iterative decoding have been discussed in the literatures extensively, many of them only focus on the solvable decoding. In this paper, we propose a new early termination (ET) scheme based on the decoding threshold. Moreover, we proposed the cross-correlation measurement to predict the decoding threshold. The iterative decoding can stop in either high-SNR situation where the decoded bits are highly reliable (solvable decoding), or in low-SNR situation where the decoder already has no capability to decode (unsolvable decoding). At the same time, the receiver can send an automatic-repeat-request (ARQ) message to the transmitter in noise-seriously-coupling situation. Through simulations, the reduced iterations due to the ET scheme almost will not affect the SNR performance. Based on our analysis and simulation results, we can further modify the conventional GENIE chart. The ET property can help to either reduce the computational complexity or power consumptions in implementing the iterative decoding in DSP processors or VLSIs in mobile handsets