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Power Control and Inter-node Interference Cancellation in Full-Duplex Networks with Residual Self-Interference

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Abstract

We consider a three-node full-duplex (FD) network, where an FD capable base station serves double mobile nodes operating in half-duplex mode. The self-interference at the base station and the inter-node interference (INI) between the uplink and the downlink nodes in the network are both taken into account. We consider the power control and the base station assisted INI suppression for sum achievable rate maximization subject to the transmit power constraints at the base station and the nodes. By reformulating this non-convex problem and separating it into two independent sub-problems, we propose a search method to solve it. We evaluate the performance of the proposed method in a single-cell scenario. The proposed method significantly outperforms other recently developed methods.

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Notes

  1. The processing delay comprises of digital and analog parts. The digital part can be solved by adopting high sampling analog digital converter (ADC) and digital analog converter (DAC), and high digital signal processing using field programmable gate array (FPGA).

  2. The channel information of the uplink, the downlink, and INI channels can be obtained as follows: (1) the uplink node broadcasts training sequences, and the base station and the downlink node estimate the uplink channel and the INI channel; (2) the downlink node sends the training data and then the INI channel information, the base station first estimates the downlink channel and then decodes the INI channel information. To save the training time consume, the channel can be estimated in time-domain.

  3. \(\alpha = 1\) means perfect SI suppression at the base station.

  4. Usually, it can be expected that the SI level will depend on the transmit power at the base station. However, it is hard to solve this problem. For simplicity, we assume that the total transmit power at the base station can always reach the maximum transmit power. On the other hand, we consider the worst case in this paper. In this case, our proposed method can outperform other methods as illustrated in the simulation section. Thus, the assumption for fixed residual SI and noise power here is reasonable.

  5. In fact, the residual SI signal plus noise \(\tilde{s}_{si}\) and the downlink signal \(s_{d}\) are correlated, but it is hard to solve it. So we assume the residual SI signal plus noise \(\tilde{s}_{si}\) and the downlink signal \(s_{d}\) are uncorrelated for simplicity which almost holds when the SI suppression ratio is very high.

  6. The carrier set here represents a subcarrier of the OFDM modulation. In practice, long enough OFDM symbol should be adopted for reducing the influence of propagation difference between the INI and the INI suppression signals.

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Acknowledgements

The authors would thank Qingpeng Liang for his helpful advice. This work was supported by the National Natural Science Foundation of China (Grant Nos. 61531009 and 61471108); the National Major Projects (Grant No. 2016ZX03001009); and the Fundamental Research Funds for the Central Universities.

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  1. UESTC, Chengdu, China

    Fei Wu & Donglin Liu

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  1. Fei Wu
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  2. Donglin Liu
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Wu, F., Liu, D. Power Control and Inter-node Interference Cancellation in Full-Duplex Networks with Residual Self-Interference. Wireless Pers Commun 108, 2371–2388 (2019). https://doi.org/10.1007/s11277-019-06526-4

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