Information-coupled turbo codes for LTE systems

We propose a new class of information-coupled Turbo codes to improve the transport block (TB) error rate performance for LTE systems. Meanwhile, we keep the LTE hybrid automatic repeat request protocol and the Turbo decoder for each code block (CB) unchanged. In the proposed codes, every two consecutive CBs in a TB are coupled together by sharing a few common information bits. We propose a feed-forward and feed-back decoding scheme to decode the whole TB by exploiting the coupled information between CBs. Numerical results show that the proposed codes achieve a signal-to-noise-ratio (SNR) gain of 0.28 dB to 0.72 dB over LTE Turbo codes for the simulated code parameters at a TB error rate level of 1CP2.