Improving code diversity on block-fading channels by spatial coupling

Najeeb Ul Hassan (1) , Michael Lentmaier (2) , Iryna Andriyanova (3) , Gerhard Fettweis (1)

1 TU Dresden - Technische Universität Dresden = Dresden University of Technology
2 Skane University Hospital [Lund]
3 ETIS - UMR 8051 - Equipes Traitement de l'Information et Systèmes

Spatially coupled low-density parity-check (SC-LDPC) codes are considered for transmission over the block-fading channel. The diversity order of the SC-LDPC codes is studied using density evolution and simulation results. We demonstrate that the diversity order of the code can be increased, without lowering the code rate, by simply increasing the coupling parameter (memory) of a SC-LDPC code. For a (3,6)-regular SC-LDPC code with rate R = 1=2 and memory mcc = 4 a remarkable diversity of d = 10 is achieved without the need for any specific code structure. The memory of the SC-LDPC codes makes them robust against a non-stationary mobile-radio environment. The decoding of SC-LDPC codes using a latency constrained sliding window decoder is also considered.

Domaines: Théorie de l'information [cs.IT]

Najeeb Ul Hassan, Michael Lentmaier, Iryna Andriyanova, Gerhard Fettweis. Improving code diversity on block-fading channels by spatial coupling. 2014 IEEE International Symposium on Information Theory (ISIT), Jun 2014, Honolulu, United States. ⟨10.1109/ISIT.2014.6875246⟩. ⟨hal-01262879⟩