Abstract
A multiway relay network (mRN), which is widely employed in the literature, is extended to represent a larger number of practical scenarios, such as a vehicular ad hoc network (VANET). For the proposed system, generalized multiway relay network (g-mRN), three transmission strategies are presented and analyzed in terms of effective rate, for different numbers of users. Assuming that the average signal-to-noise ratio (SNR) is known to the transmitters, the maximum effective rate is obtained through the optimal choice of the message rates. We also derive the effective rate for fixed message rates. Numerical results show that the best strategy under the optimal message rates is the one in which all users transmit simultaneously in the multiple access phase. But when considering fixed message rates, the best transmission strategy depends upon the SNR. These results are important in that they can be used as guidelines for selecting the right strategy and message rates depending on the situation.
Highlights
M ULTIWAY Relay Networks have been receiving a great deal of attention recently
Several communication networks were studied under the multiway relay network (mRN) concept, such as wireless sensor networks (WSN) [2], satellite networks [5], and vehicular ad hoc networks (VANETs) [6]
Similar to the pairwise-mRN strategy, at the end of the multiple access phase (MAC) phase each user will have the information of all users in its subcluster, while the relay will have the information of all users in the cluster
Summary
M ULTIWAY Relay Networks (mRNs) have been receiving a great deal of attention recently. Each user transmits its information to the relay, which in turn forwards this information to all users through the multiway relay channel (mRC) This network was first proposed by Gunduz et al in [1], and extended and elaborated on by the same authors in [2]. We remove this restriction and extend their channel model to allow direct communication within certain subsets of users. With this modification, several practical scenarios can be represented. Before enumerating the contributions of the present work, we introduce some important related works
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