High Spectrum Efficiency Full-duplex Two-way Relay Scheme for OFDM
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摘要:
针对同时同频全双工双向中继网络，该文提出一种对中继剩余自干扰信号具有鲁棒性的双向中继传输方案。该文首先对中继剩余自干扰信号进行分析，将无限迭代的剩余自干扰信号建模成等效多径信号，并利用OFDM的循环前缀对抗等效多径现象，以降低中继剩余自干扰信号对系统传输性能的影响。在等效多径方案的基础上，以系统信干噪比最大化为目标，推导出全双工双向中继传输的最佳放大因子求解方法。最后，通过仿真验证所提出的双向中继传输方案的有效性。
Abstract:For the full-duplex two-way relay network, a two-way relay transmission scheme that is robust to the relay residual self-interference signal is proposed. Firstly, the residual self-interference signal of the relay is analyzed, the infinite self-interfering signal is modeled as an equivalent multipath signal, and the cyclic prefix of OFDM is used to combat the equivalent multipath phenomenon to reduce the residual self-interference signal impact. Based on the equivalent multipath scheme, the paper aims at maximizing the SINR of the system, and deduces the optimal amplification factor solving method of the relay in bidirectional full-duplex relay transmission. Finally, the simulation verifies the correctness of the optimal amplification factor of relay, and the effectiveness of the proposed two-way relay transmission scheme is verified through simulation.
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Key words:
- Wireless communication /
- Full-duplex /
- Relay transmission /
- Equivalent multipath /
- Amplify and forward
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表 1 信号x1(1)和x2(1)在各节点处的传输情况
时隙$i$ 0 1 ··· $i$ ··· ${r^{\left( 1 \right)}}(i)$ ${{h}_{1r}}{x_1}(1) + {{h}_{2r}}{x_2}(1)$ ${(\beta {{h}_{{\rm{li}}}})^1}({{h}_{1r}}{x_1}(1) + {{h}_{2r}}{x_2}(1))$ ··· ${(\beta {{h}_{{\rm{li}}}})^i}({{h}_{1r}}{x_1}(1) + {{h}_{2r}}{x_2}(1))$ ··· ${t^{\left( 1 \right)}}(i)$ 0 $\beta ({{h}_{1r}}{x_1}(1) + {{h}_{2r}}{x_2}(1))$ ··· ${(\beta {{h}_{{\rm{li}}}})^{i - 1}}\beta ({{h}_{1r}}{x_1}(1) + {{h}_{2r}}{x_2}(1))$ ··· $y_{1}^{\left( 1 \right)}(i)$ ${{h}_{{\rm{12}}}}{x_2}(1)$ $\beta {{h}_{1r}}{{h}_{2r}}{x_2}(1)$ ··· ${(\beta {{h}_{{\rm{li}}}})^{i - 1}}\beta {{h}_{1r}}{{h}_{2r}}{x_2}(1)$ ··· $y_{2}^{\left( 1 \right)}(i)$ ${{h}_{{\rm{12}}}}{x_1}(1)$ $\beta {{h}_{1r}}{{h}_{2r}}{x_1}(1)$ ··· ${(\beta {{h}_{{\rm{li}}}})^{i - 1}}\beta {{h}_{1r}}{{h}_{2r}}{x_1}(1)$ ··· 
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