A Method for Broadband Full-Duplex MIMO Radio (original) (raw)
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Self-Interference Cancellation in MIMO Full-Duplex Transceivers
2018
The transceiver nonlinearities have recently been shown to limit the performance of in-band FD (Full-Duplex) devices. In this article, detailed modeling and mitigation algorithms of more critical of these nonlinearities, in order to obtain better SI (Self-Interference) cancellation performance are presented. In the transmitter side, we applied DPD (Digital Predistortion) to both, transmit and cancellation chains in order to obtain output signals free from nonlinearities of RF components, and crosstalk, which allow better RF cancellation. In the receiver side, the nonlinearities of RF components are modeled and the residual SI that will experiment these nonlinearities is removed by digital cancellation. Our proposed method, ''DPD cancellation'', provides one of the simple signal models that takes into account more of RF impairments, such as PA (Power Amplifier) nonlinearity, LNA (Low Noise Amplifier), DAC (Digital to Analog Converter) nonlinearities, IQ imbalance at b...
Reference Receiver Aided Digital Self-Interference Cancellation in MIMO Full-Duplex Transceivers
In this paper we propose and analyze a novel self-interference cancellation structure for single-channel MIMO full-duplex transceivers. The proposed structure utilizes reference receiver chains to obtain reference signals for digital self-interference cancellation, which means that all the transmitter-induced nonidealities will be included in the digital cancellation signal. First, we will analyze the overall achievable performance of the proposed cancellation scheme, while also providing some insight into the possible bottlenecks. We also provide a detailed formulation of the actual cancellation procedure, and perform an analysis into the effect of the actual received signal of interest on self-interference coupling channel estimation. The achieved performance of the proposed reference receiver aided digital cancellation procedure is then assessed and verified with full waveform simulations. The analysis and waveform simulation results show that under practical transmitter RF/analo...
Fifth Generation of cellular networks is coming in the next few years and we think that it will not be predicted as a development version of the existing one. The wireless research community aspires to visualize full duplex operation by supporting concurrent transmission and reception in a single time/frequency channel for the sake of improving the attainable spectral efficiency by a Factor of two as compared to the family of conventional half duplex wireless systems. The main challenge encountered in implementing full duplex wireless devices is that of finding techniques for mitigating the performance degradation caused by self-interference. Self-interference suppression will represent one of the main merits that offered by the Fifth Generation Networks. While in the existing version of mobile networks the available spectrum is not sufficiently used, the predicted version will use that spectrum in more efficient manner in such a way that it will be approximately full all the operating time. The object of this paper is to scan the existing techniques that are concerned with Self Interference cancellation on the level of antenna and system design to allow us to suggest some solutions for that problem in the future.