We investigate the problem of sum-rate maximization of a secondary link of full-duplex generalized frequency division multiplexing (GFDM) radios operating over a spectrum hole, which is surrounded by two active primary adjacent channels. Thus, the secondary transmissions must be below an adjacent channel interference (ACI) threshold. In-band distortions and several interference terms are also caused by phase noise, in-phase (I) and quadrature (Q) imbalance, carrier frequency offset (CFO) and the nonlinear power amplifier (PA). Analog domain and digital domain self-interference (SI) cancellation is also considered. We study the two cases of two independent oscillators for local transmitter and receiver and one common shared oscillator. We derive the powers of residual SI, desired signal, interference signal and noise, signal-to-interference-plus noise ratio (SINR) and the power spectral density (PSD) of the transmit signal. By using successive convex approximations, we solve the sum-rate maximization problem. Finally, we show that in full-duplex radios under certain RF impairments, GFDM may double the sum rate compared to that of orthogonal frequency division multiplexing (OFDM).

中文翻译：

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具有 RF 损伤和 ACI 约束的认知 GFDM 全双工无线电


我们研究了在频谱空洞上运行的全双工广义频分复用 (GFDM) 无线电的辅助链路的总速率最大化问题，该频谱空洞被两个活动的主相邻信道包围。因此，辅助传输必须低于相邻信道干扰（ACI）阈值。带内失真和一些干扰项也是由相位噪声、同相 (I) 和正交 (Q) 不平衡、载波频率偏移 (CFO) 和非线性功率放大器 (PA) 引起的。还考虑了模拟域和数字域自干扰（SI）消除。我们研究了本地发送器和接收器的两个独立振荡器和一个公共共享振荡器的两种情况。我们得出剩余 SI、有用信号、干扰信号和噪声的功率、信号干扰加噪声比 (SINR) 以及发射信号的功率谱密度 (PSD)。通过使用连续凸近似，我们解决了总速率最大化问题。最后，我们表明，在某些 RF 损伤下的全双工无线电中，与正交频分复用 (OFDM) 相比，GFDM 可以使总速率加倍。