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arXiv 1402.6083cs.ITmath.IT
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直接变频全双工收发机中的宽线性数字自干扰抵消

Widely-Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver

Dani Korpi, Lauri Anttila, Ville Syrjälä, Mikko Valkama

摘要:

本文讨论了全双工直接变频无线电收发器在实际不完善的射频(RF)组件下工作时的自干扰建模和消除。首先,进行详细的自干扰信号建模,考虑到最重要的RF缺陷,即发射机功率放大器非线性失真以及发射机和接收机IQ混频器幅度和相位不平衡。分析表明,现实的天线隔离和RF消除后,在接收机数字基带的主导自干扰波形可以通过原始发射数据的宽线性变换来建模,而不是经典的纯线性模型。这种宽线性自干扰波形在物理上源于发射机和接收机IQ成像,并且不能通过经典的线性数字消除来有效地抑制。受此启发,新的宽线性数字自干扰消除处理,然后提出和制定,结合有效的参数估计方法。广泛的仿真结果表明,所提出的宽线性消除处理明显优于现有的线性解决方案,因此,使实际的低成本RF前端使用的全双工收发器中的IQ混频。

英文摘要:

This article addresses the modeling and cancellation of self-interference in full-duplex direct-conversion radio transceivers, operating under practical imperfect radio frequency (RF) components. Firstly, detailed self-interference signal modeling is carried out, taking into account the most important RF imperfections, namely transmitter power amplifier nonlinear distortion as well as transmitter and receiver IQ mixer amplitude and phase imbalances. The analysis shows that after realistic antenna isolation and RF cancellation, the dominant self-interference waveform at receiver digital baseband can be modeled through a widely-linear transformation of the original transmit data, opposed to classical purely linear models. Such widely-linear self-interference waveform is physically stemming from the transmitter and receiver IQ imaging, and cannot be efficiently suppressed by classical linear digital cancellation. Motivated by this, novel widely-linear digital self-interference cancellation processing is then proposed and formulated, combined with efficient parameter estimation methods. Extensive simulation results demonstrate that the proposed widely-linear cancellation processing clearly outperforms the existing linear solutions, hence enabling the use of practical low-cost RF front-ends utilizing IQ mixing in full-duplex transceivers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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