Compute-Forward Multiple Access (CFMA): Practical Implementations
Por:
Sula, E, Zhu, JG, Pastore, A, Lim, SH, Gastpar, M
Publicada:
1 ene 2019
Categoría:
Electrical and electronic engineering
Resumen:
We present a practical strategy that aims to attain rate points on the dominant face of the multiple access channel capacity using a standard low complexity decoder. This technique is built upon recent theoretical developments of Zhu and Gastpar on compute-forward multiple access which achieves the capacity of the multiple access channel using a sequential decoder. We illustrate this strategy with off-the-shelf LDPC codes. In the first stage of decoding, the receiver first recovers a linear combination of the transmitted codewords using the sum-product algorithm (SPA). In the second stage, by using the recovered sum-of-codewords as side information, the receiver recovers one of the two codewords using a modified SPA, ultimately recovering both codewords. The main benefit of recovering the sum-of-codewords instead of the codeword itself is that it allows to attain points on the dominant face of the multiple access channel capacity without the need of rate-splitting or time sharing while maintaining a low complexity in the order of a standard point-to-point decoder. This property is also shown to be crucial for some applications, e.g., interference channels. For all the simulations with single-layer binary codes, our proposed practical strategy is shown to be within 1.7 dB of the theoretical limits, without explicit optimization on the off-the-self LDPC codes. © 1972-2012 IEEE.
Filiaciones:
Sula, E:
Ecole Polytech Fed Lausanne, Sch Comp & Commun Sci, CH-1015 Lausanne, Switzerland
Zhu, JG:
Univ Melbourne, Dept Elect & Elect Engn, Melbourne, Vic 3010, Australia
Pastore, A:
CTTC CERCA, Dept Stat Inference Commun & Positioning, Castelldefels 08860, Spain
Lim, SH:
Korea Inst Ocean Sci & Technol, ICT Convergence Res Ctr, Busan 49111, South Korea
Gastpar, M:
Ecole Polytech Fed Lausanne, Sch Comp & Commun Sci, CH-1015 Lausanne, Switzerland
Green Submitted, All Open Access; Green Open Access
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