Wideband Dual-Injection Path Self-Interference Cancellation Architecture for Full-Duplex Transceivers

Zhang, Tong; Su, Chenxin; Najafi, Ali; Rudell, Jacques C.

doi:10.1109/jssc.2018.2805874

Cited by 54 publications

(21 citation statements)

References 60 publications

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“…The simulation results are provided to demonstrate the performance of the proposed ICA-SS-assisted FD relay system. System parameters are set as follows: the source and destination are equipped with a single transmit antenna and N d = 2 receive antennas, respectively; the relay is equipped with N t = 2 transmit and N m = 2 receiver antennas; the CSI remains constant during a data frame with N s = 256 OFDM blocks each with N = 64 subcarriers; the QPSK modulation scheme is utilized; the channel follows an exponential delay profile with a normalized root mean-square (RMS) delay spread of 1.4; a CP of length L cp = 16 is used; the bandwidth is set as 100 MHz; the precoding constant is set as a = 0.26; the target BER = 10 −5 is used for EE analysis; the PAE is set to η PAE = 40% [39]; the PA gain is β PA = 36 dB [42]; the noise figure of each LNA is F = 1.5 dB [43]; the TSP and PSP coefficients ω T and ω P of the existing methods [18], [22] are both set as 0.5; regarding the nonlinear EH model parameters, we assume P sat = 300 mW, b 1 = 10, and b 2 = 0.14 [32]. All the simulation results are averaged over Monte-Carlo runs with independent source data, noise, and channel realizations.…”

Section: Numerical Resultsmentioning

confidence: 99%

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

Duan

Zhu

Jiang

et al. 2020

IEEE Internet Things J.

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In this article, we propose a semi-blind full-duplex (FD) amplify-and-forward (AF) relay system with adaptive self-interference (SI) processing assisted by independent component analysis (ICA) for low-latency and high-reliability (LLHR) Internet of Things (IoT). The SI at FD relay is not necessarily canceled as much as possible like the conventional approaches, but is canceled or utilized based on a signal-to-residual-SI ratio (SRSIR) threshold at relay. According to the selected SI processing mode at relay, an ICA-based adaptive semi-blind scheme is proposed for signal separation and detection at destination. The proposed FD relay system not only features reduced signal processing cost of SI cancelation but also achieves a much higher degree of freedom in signal detection. The resulting bit error rate (BER) performance is robust against a wide range of SRSIR, much better than that of conventional FD systems, and close to the ideal case with perfect channel state information (CSI) and perfect SI cancelation. The proposed system also requires negligible spectral overhead as only a nonredundant precoding is needed for ambiguity elimination in ICA. In addition, the proposed system enables full resource utilization with consecutive data transmission at all time and same frequency, leading to much higher throughput and energy efficiency than the time-splitting and power-splitting-based self-energy recycling approaches that utilize only partial resources. Furthermore, an intensive analysis is provided, where the SRSIR thresholds for the adaptive SI H. Duan and Y. Jiang are with the

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Section: Numerical Resultsmentioning

confidence: 99%

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

Duan

Zhu

Jiang

et al. 2020

IEEE Internet Things J.

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“…Distortion introduced by Z rx should be considered as the residual SI power at RX input is still substantially larger (by 10s of dB) compared with the desired RX signal [4], [8]. Any distortion introduced by Z rx will add to the nonlinearities produced by the TX-SI passing through the SI mitigation circuits or the intermodulation products produced by the RX chain referenced back to the RX input ( Fig.…”

Section: B Radio Air Interface Sources Of Distortionmentioning

confidence: 99%

“…The RX chain contains an LNA [8], passive mixers, followed by a transimpedance amplifier (TIA) which then feeds the analog baseband, all modeled using transistor-level schematic simulations. The RF canceler is implemented as an adaptive FIR filter identical to the implementation given in [4], [8].…”

Section: A Circuit Simulation Modelmentioning

confidence: 99%

“…Full-duplex (FD) communication systems, capable of simultaneously transmitting and receiving on the same channel, have evolved to address some of these future high-data rate demands. However, mitigating transmitter (TX) self-interference (SI) present at the receiver (RX) front-end remains a major challenge [2]- [4]. The TX leakage which directly couples into the RX input has the shortest delay and highest magnitude, thus the demands on RX linearity are placed at the RX input interface where numerous methods haven been explored to improve the TXto-RX isolation [4]- [9].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

Yin

Rudell

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper explores and models the generation of nonlinearities arising from common-and differential-mode transmitter (TX) self-interference (SI) at the input of full-duplex (FD) radio receivers (RX). The analysis reveals the impact of residual TX-SI which drives the RX input impedance(Zrx), generating distortion products that degrade the RX linearity. Circuit simulation results confirm a nonlinear Zrx introduces non-negligible distortion at the RX input from the residual TX-SI. To suppress the total distortion below the RX noise floor, SI mitigation circuits at RF front-end must provide at least 60dB SI suppression and 50dB common-mode isolation to achieve sufficient RX linearity performance. This paper draws conclusions with respect to strategies that allow a reduction in the nonlinearities generated at the RX input due to residual TX-SI as would be found in FD transceivers.

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“…The FD radio is widely known as a simultaneously transmit and receive capable radio since it enables the transmitter (TX) and receiver (RX) to operate at the same time and over the same frequency. Such operation substantially alleviates the radio spectrum allocation burden, thereby yielding uncompromised communication data capacity [3]- [7]. One of the entire challenges of an FD transceiver is that transmitted signals can directly feed into the RX chain, which will cause self-interference and severely diminish the RX's dynamic range.…”

mentioning

confidence: 99%

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

Chen

Deng

Shu

et al. 2021

IEEE Trans. Microwave Theory Techn.

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In this article, a wideband quasi-circulator (QC) with the low noise figure (NF) and high 1-dB compression point (P 1 dB ) is proposed. The slotline-based 180 • hybrid is introduced to achieve the wideband high transmitter-receiver (TX-RX) isolation. Meanwhile, the bidirectional in-phase stage and the nonreciprocal out-of-phase stage are utilized to obtain specific power-split ratios for the low insertion loss and high antenna-transmitter (ANT-TX) isolation. By using the unequal power split, the proposed QC is without the fundamental 3-dB loss seen in reciprocal ANT interfaces. Besides, to further enhance the TX-RX isolation within a wideband, a reconfigurable inter-stage matching network based on a varactor-tuned capacitor is implemented. To verify the mechanisms mentioned above, a reconfigurable wideband QC operating at 1.75-2.9 GHz is implemented and fabricated. The total power consumption is 224 mW. The measurement exhibits in-band TX-RX isolation of 27-58 dB. The TX-ANT and ANT-RX insertion losses are 4.3-5.0 dB and 1.0-1.9 dB, respectively. The QC also achieves the minimum in-band ANT-RX NF of 3.4 dB. Meanwhile, the measured TX-ANT and ANT-RX IIP3s are 39.4 and 32.5 dBm, respectively. The TX input P 1 dB is greater than 28.78 dBm, while the RX input P 1 dB is 23 dBm. The TX-induced ANT-RX P 1 dB is measured to be 28 dBm. Index Terms-180 • hybrid full-duplex (FD), quasi-circulator (QC), reconfigurable circuits, wideband. I. INTRODUCTIONW ITH the ever-increasing demand for high data rates in modern wireless communications, there are urgent requirements of wireless channels with large capacity and high spectral efficiency in recent years. To satisfy the practical requirements, either time or frequency division duplexing systems are employed [1], [2]. However, all these systems are exclusively half-duplex, which limits the maximum transmission rate to only half of the network capacity. For this reason, the full-duplex (FD) system is introduced to double the Manuscript

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Wideband Dual-Injection Path Self-Interference Cancellation Architecture for Full-Duplex Transceivers

Cited by 54 publications

References 60 publications

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

Effects of Receiver Input Impedance on Nonlinear Distortion in Full-Duplex Radios

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

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