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      A Novel User Pairing Scheme for Functional Decode-and-Forward Multi-way Relay Network

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          Abstract

          In this paper, we consider a functional decode and forward (FDF) multi-way relay network (MWRN) where a common user facilitates each user in the network to obtain messages from all other users. We propose a novel user pairing scheme, which is based on the principle of selecting a common user with the best average channel gain. This allows the user with the best channel conditions to contribute to the overall system performance. Assuming lattice code based transmissions, we derive upper bounds on the average common rate and the average sum rate with the proposed pairing scheme. Considering M-ary quadrature amplitude modulation with square constellation as a special case of lattice code transmission, we derive asymptotic average symbol error rate (SER) of the MWRN. We show that in terms of the achievable rates, the proposed pairing scheme outperforms the existing pairing schemes under a wide range of channel scenarios. The proposed pairing scheme also has lower average SER compared to existing schemes. We show that overall, the MWRN performance with the proposed pairing scheme is more robust, compared to existing pairing schemes, especially under worst case channel conditions when majority of users have poor average channel gains.

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          Author and article information

          Journal
          2014-02-26
          2014-09-23
          Article
          1402.6422
          7bc5422d-4c31-45ae-b0f6-3b635a4ad1a9

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          94A05, 94B70
          30 pages, 6 figures, submitted for journal publication
          cs.IT math.IT

          Numerical methods,Information systems & theory
          Numerical methods, Information systems & theory

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