A Special Case of Multi-Way Relay Channel: When Beamforming is not Applicable

Zhao, Zhongyuan; Ding, Zhiguo; Wang, Wenbo; Leung, Kin K.

doi:10.1109/twc.2011.052311.101655

Cited by 42 publications

(34 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the absence of pre-coding [6] or beamforming [20], our new scheme can achieve the optimal time efficiency compared to other scheduling schemes for multi-way relay systems with PNC. The following theorem can justify this fact.…”

Section: Time Consumption Analysismentioning

confidence: 99%

Efficient scheduling scheme for multi-way relay systems with physical-layer network-coding

Yan

Zhang

et al. 2012

2012 IEEE Global Communications Conference (GLOBECOM)

View full text Add to dashboard Cite

In this paper, we propose a novel scheduling scheme which can be employed for multi-way relay systems. This new scheme is based on the physical-layer network coding (PNC). To evaluate our proposed scheme, the bit-error-rate (BER) and throughput metrics are analyzed for the multi-way relay systems enduring both channel fading and additive white Gaussian noise (AWGN). Moreover, numerous Monte Carlo experiments are undertaken to compare our proposed new scheduling scheme with other existing strategies. The simulation results demonstrate that our proposed scheme is much more efficient than other existing methods.Index Terms-Physical-layer network coding (PNC), scheduling, throughput analysis.

show abstract

Section: Time Consumption Analysismentioning

confidence: 99%

Efficient scheduling scheme for multi-way relay systems with physical-layer network-coding

Yan

Zhang

et al. 2012

2012 IEEE Global Communications Conference (GLOBECOM)

View full text Add to dashboard Cite

show abstract

“…where F (G t , α t , t, l) = E |s k − α tŝk,l | 2 of (17). From the Lagrangian function, the Karush-Kuhn-Tucker (KKT) conditions can be derived and η can be computed, which is presented in the Appendix.…”

Section: Anc Aware Transceive Filter Design At Rsmentioning

confidence: 99%

Non-regenerative multi-way relaying: Combining the gains of network coding and joint processing

Degenhardt

Rong

Klein

2013

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

Abstract-In this paper, we consider a non-regenerative multigroup multi-way relaying scenario in which each group consists of multiple half-duplex nodes. Each node wants to share its data with all other nodes within its group. The transmissions are performed via an intermediate non-regenerative half-duplex multi-antenna relay station, termed RS, which spatially separates the different groups. In our proposal, all nodes simultaneously transmit to RS during a common multiple access phase and RS retransmits linearly processed versions of the received signals back to the nodes during multiple broadcast (BC) phases. We propose a novel transmit strategy which exploits analog network coding (ANC) and efficiently combines spatial transceive processing at RS with joint receive processing at each node over multiple BC phases. A closed-form solution for an ANC aware relay transceive filter is introduced and closed-form solutions for the joint receive processing filters at the nodes are presented. Furthermore, self-interference cancellation and successive interference cancellation are exploited at the nodes to improve the joint receive processing. By numerical results, it is shown that the proposed transmit strategy significantly outperforms existing multi-way strategies.Index Terms-Multi-way relaying, non-regenerative relay, analog network coding (ANC), minimum mean-squared error (MMSE).

show abstract

“…When the user terminals have a single antenna and the relay performs a zero forcing based pre-coding, the capacity regions of the multi-pair two-way channels are analyzed in [8]. The optimization of the linear relay pre-coder when the user pair beamformers are fixed is treated in [9], [10]. With an odd M antennas at the relay, a relay pre-coding method that achieves M + 1 degrees of freedom (DoF) is introduced in [ In this letter, we consider the case where the decode-andforward (DaF) relay and the user terminals have multiple antennas.…”

Section: Introductionmentioning

confidence: 99%

Channel Aligned Beamforming in Two-Way Multi-Pair Decode-and-Forward Relay Down-Link Channels

Hwang

Kim

Park

2012

IEEE Wireless Commun. Lett.

View full text Add to dashboard Cite

We consider the down-link of multi-pair two-way decode-and-forward (DaF) relay channel with multiple antennas at all the nodes. We propose schemes composed of relay precoder and user receive beam-formers to support 2M degrees of freedom when M antennas are employed at the relay. A channel aligning technique, where the channel vectors of a pair are forced to be aligned, is introduced so that we can use, at the relay, the well-known pre-coder like zero forcing (ZF) or the regularized channel inversion (RI) from the cellular down-link channels. Alternation based optimization of the pre-coder and the beam-formers searches the channel aligned vector space to further enhance the performance of the scheme in the low and mid SNR range.

show abstract

A Special Case of Multi-Way Relay Channel: When Beamforming is not Applicable

Cited by 42 publications

References 13 publications

Efficient scheduling scheme for multi-way relay systems with physical-layer network-coding

Efficient scheduling scheme for multi-way relay systems with physical-layer network-coding

Non-regenerative multi-way relaying: Combining the gains of network coding and joint processing

Channel Aligned Beamforming in Two-Way Multi-Pair Decode-and-Forward Relay Down-Link Channels

Contact Info

Product

Resources

About