Pilot transmission scheme and robust filter design for non-regenerative multi-pair two-way relaying

In a switching problem, a one-to-one mapping from the inputs to the outputs is conducted according to a switch pattern, i.e., a permutation matrix. In this paper, we investigate a wireless switching problem, in which a group of single-antenna relays acts together as a multiple-input-multiple-output (MIMO) switch to carry out distributed precode-and-forward. All users transmit simultaneously to the MIMO switch in the uplink and then the MIMO switch precodes the received signals and broadcasts in the downlink. Ideally, each user could receive its desired signal from one other user with no or little interference from other users. Self-interference is allowed in the received signals, as it can be canceled when each user has the channel gain of its self-interference. We propose two distributed relaying schemes based on two widely adopted criteria, i.e., zero-forcing relaying and minimum mean square error (MMSE) relaying. For the distributed zero-forcing relaying, we further propose a message passing approach, with which the proposed zero-forcing relaying achieves significant throughput gain with little attendant overhead. We also claim that the proposed MMSE relaying achieves even larger throughput at the expense of larger amount of message passing. Simulation results validate the throughput gains of the proposed relaying schemes.

show abstract

“…The channel estimation at the relays is out of the scope of this paper. More details can be found in [20,21].…”

Section: Distributed Zero-forcing Relayingmentioning

confidence: 99%

Wireless MIMO switching: distributed zero-forcing and MMSE relaying using network coding

Wang

Zhang

2013

EURASIP J. Adv. Signal Process.

View full text Add to dashboard Cite

show abstract

“…Degenhardt et al . [18] extend to K pairwise users' information exchange with the aid of 2K antennas and a bi‐directional relay node under the imperfect CSI. Furthermore, Degenhardt et al .…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Degenhardt et al . [18] introduce a novel pilot transmission scheme. The system in [19] pre‐assigns a single antenna equipped with M source‐destination pairs, which communicate simultaneously via multiple antenna AF‐based OWRs while employing ZF beamforming at the relay node with imperfect CSI.…”

Section: Introductionmentioning

confidence: 99%

Opportunistic source‐pair selection method with imperfect channel state information for multiuser bi‐directional relaying networks

Özduran¹,

Yarman²,

Cioffi

2019

IET Communications

View full text Add to dashboard Cite

“…The required CSI can be obtained through channel training and estimation [32]- [36]. In this paper, it is assumed that RS has perfect knowledge of the channel coefficients in h k to compute the relay transceive filter.…”

Section: Introductionmentioning

confidence: 99%

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

Degenhardt

Rong

Klein

2013

IEEE Trans. Wireless Commun.

Self Cite

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

Pilot transmission scheme and robust filter design for non-regenerative multi-pair two-way relaying

Cited by 4 publications

References 18 publications

Wireless MIMO switching: distributed zero-forcing and MMSE relaying using network coding

Wireless MIMO switching: distributed zero-forcing and MMSE relaying using network coding

Opportunistic source‐pair selection method with imperfect channel state information for multiuser bi‐directional relaying networks

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

Contact Info

Product

Resources

About