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首页> 外文期刊>Communications, IEEE Transactions on >An Optimal Full-Duplex AF Relay for Joint Analog and Digital Domain Self-Interference Cancellation
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An Optimal Full-Duplex AF Relay for Joint Analog and Digital Domain Self-Interference Cancellation

机译：用于模拟和数字域自干扰消除的最佳全双工AF继电器

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摘要

In this paper, a full-duplex (FD) amplify-and-forward (AF) relay is designed to compensate for the duplexing loss of the half-duplex (HD) AF relay. In particular, when there is no direct link between a source and a destination, joint analog domain self-interference suppression and digital domain residual self-interference cancellation is considered with an FD-AF relay having single receive antenna but multiple transmit antennas. Unlike previous approaches, a nonconvex quadratically constrained quadratic programming problem is formulated to find the optimal solution. The end-to-end spectral efficiency or, equivalently, the end-to-end signal-to-interference-plus-noise ratio from the source to the destination is chosen as the objective function to be maximized subject to the average transmit power constraint at the relay. In addition, an average power constraint is imposed on the output of the relay's receive antenna to avoid the nonlinear distortion in the low noise amplifier and the excessive quantization noise in the analog-to-digital converter. Through the systematic reduction and the partitioning of the constraint set, the optimal solution is derived in a closed algorithmic expression and shows how it allocates the transmission power not only in the direction of maximal performance improvement but also in the orthogonal direction in order to balance the system performance and the amount of self interference. It is shown that the optimal FD-AF relay significantly outperforms the optimal HD-AF relay even with the hardware limitations in the RF chain of the relay's receiver being well taken into account.
机译：本文设计了一种全双工（FD）放大转发（AF）继电器，以补偿半双工（HD）AF继电器的双工损耗。特别地，当在源与目的地之间没有直接链接时，对于具有单个接收天线但具有多个发射天线的FD-AF中继，可以考虑联合模拟域自干扰抑制和数字域残留自干扰消除。与以前的方法不同，提出了一个非凸二次约束二次规划问题，以找到最佳解。选择端到端频谱效率或等效地从源到目的地的端到端信号干扰加噪声比作为要遵循平均发射功率约束最大化的目标函数在接力赛。此外，对继电器接收天线的输出施加了平均功率约束，以避免低噪声放大器中的非线性失真和模数转换器中的过多量化噪声。通过对约束集进行系统的归约和划分，最优解在一个封闭的算法表达式中得出，并展示了它如何不仅在最大性能改进的方向上而且还在正交方向上分配传输功率，以平衡系统性能和自干扰量。结果表明，即使充分考虑了中继接收器RF链中的硬件限制，最佳FD-AF中继也明显优于最佳HD-AF中继。

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