Abstract
Multi-way relay networks (MWRNs) allow multiple users to exchange information with each other through a single relay terminal. MWRNs are often incorporated with capacity achieving lattice codes to enable the benefits of high-rate signal constellations to be extracted. In this paper, we analytically characterize the symbol error rate (SER) performance of a functional de- code and forward (FDF) MWRN in the presence of channel estimation errors. Considering M-ary quadrature amplitude modulation (QAM) with square constellations as an important special case of lattice codes, we obtain asymptotic expressions for the average SER for a user in FDF MWRN. The accuracy of the analysis at high signal-to-noise ratio is validated by comparison with the simulation results. The analysis shows that when a user decodes other users with better channel conditions than itself, the decoding user experiences better error performance. The analytical results allow system designers to accurately assess the non-trivial impact of channel estimation errors and the users° channel conditions on the SER performance of a FDF MWRN withM-QAM modulation.
Original language | English |
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Article number | 7742716 |
Pages (from-to) | 677-687 |
Number of pages | 11 |
Journal | Journal of Communications and Networks |
Volume | 18 |
Issue number | 5 |
DOIs | |
Publication status | Published - Oct 2016 |