Approaching Capacity Region for Two-User GBC With Bit-Division Multiplexing

A two-user Gaussian broadcast channel (GBC) with finite input constellations is addressed in this paper. The constellation-constrained capacity region for the two-user GBC by recently proposed bit-division multiplexing (BDM) is derived. BDM can be seen as a practical implementation of constellation-...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2015-07, Vol.64 (7), p.3311-3316
Main Authors: Song, Jian, Jin, Huangping, Peng, Kewu
Format: Article
Language:English
Subjects:
Bit rate
Complexity theory
Indexes
Iterative decoding
Multiplexing
Resource management
Vectors
Citations: Items that this one cites
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Summary:A two-user Gaussian broadcast channel (GBC) with finite input constellations is addressed in this paper. The constellation-constrained capacity region for the two-user GBC by recently proposed bit-division multiplexing (BDM) is derived. BDM can be seen as a practical implementation of constellation-constrained nonlinear superposition coding (SC). For comparison, the constellation-constrained capacity region for the two-user GBC by traditional constellation-constrained linear SC is also computed. With similar implementation complexity, BDM outperforms traditional constellation-constrained linear SC with lower shaping loss in the capacity defined in this paper. Analytical results show that the upper boundary of the capacity region for the two-user GBC can be well approached by BDM with amplitude phase-shift keying modulation, which could be considered as the preliminary demonstration on the applicability of BDM in practical systems.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2014.2349032