An Optimal Full-Duplex AF Relay for Joint Analog and Digital Domain Self-Interference Cancellation

Kang, Young Yun; Kwak, Byung-Jae; Cho, Joon Ho

doi:10.1109/tcomm.2014.2342230

Cited by 53 publications

(45 citation statements)

References 28 publications

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“…Provided that the SI cannot be fully eliminated due to practical imperfections [1]- [6], the transmitted SI power is assumed to scale with the relay transmit power by obeying an exponent µ, i.e., we have ρ SI = ρ 1−µ , where 0 ≤ µ ≤ 1 characterizes the efficiency of SI cancellation [9]. Then the received signal at R b subjected to SI is given by…”

Section: System Modelmentioning

confidence: 99%

On the Performance of Full-Duplex Multi-Relay Channels With DF Relays

Feng

et al. 2017

IEEE Trans. Veh. Technol.

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Abstract-In this paper, we consider a two-hop full-duplex multi-relay channel (FD-MRC) for exploiting the high spectral efficiency of FD systems and the diversity gains of multirelay systems. Employing a decode-and-forward (DF) relaying protocol, the single best relay is selected from those relays that have successfully decoded the source message, which then helps forward the source message to the destination. Meanwhile, a new message is broadcasted by the source and all the N relays, including the selected best one, attempt to decode this new message. In view of the effect of both inter-relay interference and self-interference (SI), a one-step correlation exists between the relay decoding results in successive time slots. Then a Markov chain-based analytical model is utilized for analyzing the exact outage probability of FD-MRC. Furthermore, a closeto-full diversity order of (N − 1 + µ) is analytically proved to be attainable for FD-MRC, where µ is a factor characterizing the efficiency of SI mitigation.

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Section: System Modelmentioning

confidence: 99%

On the Performance of Full-Duplex Multi-Relay Channels With DF Relays

Feng

et al. 2017

IEEE Trans. Veh. Technol.

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“…According to the source-to-destination system formulas of (7), the minimization of the sum of MSEs of the two consecutive time slots can be written as arg min…”

Section: Minimum Sum-mse Beamformingmentioning

confidence: 99%

“…Nevertheless, it does not address the issue of bandwidth inefficiency in unidirectional relaying. Although full-duplex relaying is a very promising cooperation scheme [6,7], there are numerous technical challenges to be tackled before its extensive deployment [8]. Among the existing unidirectional relaying protocols, two-path successive relaying is an attractive scheme for retaining the bandwidth efficiency under the half-duplex constraint of relay nodes [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Note that different from [19], where the end-to-end performance and beamforming coupling are not considered, the proposed schemes take into account the switching between transmit and receive beamforming based on SINR and Sum-MSE metrics. Last but not least, as the maturity of full-duplex relay systems is still under progress [6][7][8], half-duplex relaying remains to be the dominant cooperation mode for practical deployment in the near future [20], especially for scenarios where cost is the major concern. Particularly, it is found that with only two antennas installed on each relay node, both proposed beamforming schemes can outperform singleantenna full-duplex relaying in terms of the achievable system rate.…”

Section: Introductionmentioning

confidence: 99%

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Beamforming for inter‐relay interference reduction in MIMO‐aided two‐path successive relaying

Hou

Jiang

2016

Wireless Communications

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To effectively reduce the inter-relay interference (IRI) in two-path successive relaying, two beamforming schemes are proposed in this paper, utilizing multiple-antenna relay nodes. Specifically, the two cooperation nodes perform receive combining of the source signal and transmit beamforming of the relayed signal alternately in the successive relaying process. As a result, the IRI between them can be effectively suppressed, thanks to the additional degree of freedom provided by the multiple-input multiple-output inter-relay channel. In the first beamforming scheme, the source-to-destination signal-to-interference-plus-noise ratios (SINR) of separate paths are maximized with approximation, leading to a minimum variance distortionless response beamformer under the high SINR condition. To further improve the system performance, noting that the received SINRs of the two paths have impact on each other due to the mutual coupling of the beamformers, the sum of mean squared errors from these two transmission paths is minimized in the second scheme. Based on this performance criterion, a suboptimal beamformer design is developed numerically through cyclic minimization of the sum of mean squared error cost function. Simulation results demonstrate the superiority of both proposed beamforming schemes in terms of symbol error rate and the achievable system rate, in particular, at high IRI levels.

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“…Due to channel estimation errors, the RF canceller cannot completely remove the interference. Hence, the residual interference after the RF canceller is still higher than the receiver noise floor and needs to be cancelled via digital processing at baseband [4], [5], [9]. However, effective self-interference cancellation at baseband requires accurate knowledge of the digital channels, which are the channels observed by the receiver at baseband after the passive and RF cancellation stages [10].…”

Section: Introductionmentioning

confidence: 99%

Residual self-interference cancellation and data detection in full-duplex communication systems

Koohian

Mehrpouyan

Nasir

et al. 2017

2017 IEEE International Conference on Communications (ICC)

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Abstract-Residual self-interference cancellation is an important practical requirement for realizing the full potential of full-duplex (FD) communication. Traditionally, the residual selfinterference is cancelled via digital processing at the baseband, which requires accurate knowledge of channel estimates of the desired and self-interference channels. In this work, we consider point-to-point FD communication and propose a superimposed signaling technique to cancel the residual self-interference and detect the data without estimating the unknown channels. We show that when the channel estimates are not available, data detection in FD communication results in ambiguity if the modulation constellation is symmetric around the origin. We demonstrate that this ambiguity can be resolved by superimposed signalling, i.e., by shifting the modulation constellation away from the origin, to create an asymmetric modulation constellation. We compare the performance of the proposed detection method to that of the conventional channel estimation-based detection method, where the unknown channels are first estimated and then the data signal is detected. Simulations show that for the same average energy over a transmission block, the bit error rate performance of the proposed detection method is better than that of the conventional method. The proposed method does not require any channel estimates and is bandwidth efficient.

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An Optimal Full-Duplex AF Relay for Joint Analog and Digital Domain Self-Interference Cancellation

Cited by 53 publications

References 28 publications

On the Performance of Full-Duplex Multi-Relay Channels With DF Relays

On the Performance of Full-Duplex Multi-Relay Channels With DF Relays

Beamforming for inter‐relay interference reduction in MIMO‐aided two‐path successive relaying

Residual self-interference cancellation and data detection in full-duplex communication systems

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