On the achievable rates of pairwise multiway relay channels

Borujeny, Reza Rafie; Noori, Moslem; Ardakani, Masoud

doi:10.1109/isit.2014.6875328

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…Also, in the broadcast phase, in the (ℓ−1) th time slot, the relay broadcasts the decoded network coded message to all the users. For the multiple access phase, the optimum values of α and β j in (13) and (12), respectively, are obtained by setting dn dα = 0 and dn ′ dβ j = 0, where n and n ′ are given in (7) and (9), respectively. From this, we obtain α = P |h i,r | 2 +P |h ℓ,r | 2 P |h i,r | 2 +P |h ℓ,r | 2 +N 0 and β j = Pr|h j,r | 2 Pr|h j,r | 2 +N 0 .…”

Section: Discussionmentioning

confidence: 99%

“…Multi-way relay networks (MWRNs), where a single relay facilitates all users in the network to exchange information with every other user, have important potential applications in teleconferencing, data exchange in a sensor network or file sharing in a social network X [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12]. A MWRN is a generalization of two-way relay networks (TWRNs), which enable bidirectional information exchange between two users and are widely recognized in the literature for their improved spectral efficiency, compared to conventional relaying [13], [14], [15], [16], [17], [18].…”

Section: Introductionmentioning

confidence: 99%

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A novel user pairing scheme for functional decode-and-forward multi-way relay network

Islam

Durrani

Sadeghi

2015

Physical Communication

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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. Index TermsMulti-way relay network, functional decode and forward, pairing scheme, wireless network coding.The authors are with the Research this paper are as follows:• Considering an L-user FDF MWRN employing sufficiently large dimension lattice codes, we derive upper bounds for the common rate and sum rate with the proposed pairing scheme (cf. Theorems 1 − 2).• Considering an L-user FDF MWRN with M-ary quadrature amplitude modulation (QAM) based transmission, which is a special case of lattice code based transmission, we derive the asymptotic average SER with the proposed pairing scheme (cf. Theorem 3). • We present important insights, obtained from a careful analysis of the results in Theorems 1-3, in the form of Propositions 1-9. Analyzing the results in Theorems 1-3, we compare the performance of the proposed pairing scheme with the existing pairing schemes and show that: -For the equal average channel gain scenario, the average common rate and the average sum rate are the same for the proposed and existing pairing schemes, but the average SER improves with the proposed pairing scheme (cf. Propositions 1, 4 and 7).-For the unequal average channel gain scenario, the average common rate, the average sum rate and the average SER all improve for the proposed pairing scheme (cf. Propositions 2, 5 and 8).-For the variable average channel gain scenario, the average common rate for the proposed pairing scheme is practically the same as the existing schemes, whereas, the average sum rate and the average SER improve for the proposed pairing scheme (cf. Propositions 3, 6 and 9).The rest of the paper is organized as follows. The system model is presented in Section II. The proposed pairing scheme is discussed in Section III and the general lattice code based transmissions with the proposed pairi...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel user pairing scheme for functional decode-and-forward multi-way relay network

Islam

Durrani

Sadeghi

2015

Physical Communication

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“…However, on the other hand, more simultaneous transmissions imply higher signal processing complexity in the associated receivers. Therefore, to reduce this complexity in the MAC phase, some authors have recently restricted the number of users transmitting simultaneously to two [3], [10]- [12]. These works seek to optimize the performance/throughput of the system through the choice of the optimal pairs of users to transmit simultaneously and the optimal orderings.…”

Section: A Prior Related Researchmentioning

confidence: 99%

“…The relay receives a superposition of two signals (assuming two subclusters), and the users not transmitting in the current TS receive only the signal from the user selected for transmission in its corresponding subcluster. The transmission strategies in [3], [10]- [12] do not take advantage of this side information as we do here in our pairwise strategy.…”

Section: B Motivation and Our Contributionmentioning

confidence: 99%

Generalized Multiway Relay Network: Proposition and Effective Rate Analysis

Doniak

Souza

Filho

2018

JCIS

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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.Index Terms-Multiway relay network, Effective rate, Message rate, VANET.

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“…In [15], the results for optimal pairing has been presented without proofs. The current work also extends the sum rate results of [15] to cases that some users are listeners only and do not participate in data sharing. 2 Note that for any given MWRC with N users, we can always label the user with the worst SNR (poorest channel) as U1, the second worst user as U2, and so on.…”

Section: System Modelmentioning

confidence: 99%

Maximizing Data Rate for Multiway Relay Channels With Pairwise Transmission Strategy

Borujeny

Noori

Ardakani

2017

IEEE Trans. Wireless Commun.

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In a multiway relay channel (MWRC), pairwise transmission strategy can be used to reduce the computational complexity at the relay and the users without sacrificing the data rate, significantly. The performance of such pairwise strategies, however, is affected by the way that the users are paired to transmit. In this paper, we study the effect of pairing on the common rate and sum rate of an MWRC with functional-decode-forward (FDF) relaying strategy where users experience asymmetric channel conditions. To this end, we first develop a graphical model for an MWRC with pairwise transmission strategy. Using this model, we then find the maximum achievable common rate and sum rate as well as the user pairings that achieve these rates. This marks the ultimate performance of FDF relaying in an MWRC setup. Further, we show that the rate enhancement achieved through the optimal user pairing becomes less pronounced at higher SNRs. Using computer simulations, the performance of the optimal pairing is compared with those of other proposed pairings in the literature. Index TermsMultiway relay channels, functional-decode-forward, pairwise relaying, common rate, sum rate.The authors are with the

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On the achievable rates of pairwise multiway relay channels

Cited by 9 publications

References 16 publications

A novel user pairing scheme for functional decode-and-forward multi-way relay network

A novel user pairing scheme for functional decode-and-forward multi-way relay network

Generalized Multiway Relay Network: Proposition and Effective Rate Analysis

Maximizing Data Rate for Multiway Relay Channels With Pairwise Transmission Strategy

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