Full-Duplexing With SDR Devices: Algorithms, FPGA Implementation, and Real-Time Results

Anttila, Lauri; Lampu, Vesa; Hassani, Seyed Ali; Campo, Pablo Pascual; Korpi, Dani; Turunen, Matias; Pollin, Sofie; Valkama, Mikko

doi:10.1109/twc.2020.3040226

Cited by 24 publications

(10 citation statements)

References 47 publications

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“…In order to realize full-duplex systems on SDR platforms, the works [12], [13] and [14] present digital self-interference mitigation techniques. Such techniques, however, cannot eliminate the self-interference to the same extent as compared to switching between Rx and Tx due to the unpredictable noise coming from the LO.…”

Section: Related Workmentioning

confidence: 99%

WIP: Achieving Self-Interference-Free Operation on SDR Platform with Critical TDD Turnaround Time

Havinga,

Jiao,

Aslam

et al. 2022

Preprint

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Software Defined Radio (SDR) platforms are valuable for research and development activities or high-end systems that demand real-time adaptable wireless protocols. While low latency can be achieved using the dedicated digital processing unit of a state-of-the-art SDR platform, its Radio Frequency (RF) front-end often poses a limitation in terms of turnaround time (TT), the time needed for switching from the receiving to the transmitting mode (or vice versa). Zero Intermediate Frequency (ZIF) transceivers are favorable for SDR, but suffer from selfinterference even if the device is not currently transmitting. The strict MAC-layer requirements of Time Division Duplex (TDD) protocols like Wi-Fi cannot be achieved using configurable ZIF transceivers without having to compromise receiver sensitivity. Using a novel approach, we show that the TT using the AD9361 RF front-end can be as low as 640 ns, while the self-interference is at the same level as achieved by the conventional TDD mode, which has a TT of at least 55 µs. As compared to Frequency Division Duplex (FDD) mode, a decrease of receiver noise floor by about 13 dB in the 2.4 GHz band and by about 4.5 dB in the 5 GHz band is achieved.

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Section: Related Workmentioning

confidence: 99%

WIP: Achieving Self-Interference-Free Operation on SDR Platform with Critical TDD Turnaround Time

Havinga,

Jiao,

Aslam

et al. 2022

Preprint

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“…Since S, corresponds to the sum of energy levels when e = 1, we refer to S as the set of complementary energy levels. Note that there is one-to-one correspondence between the elements of S and S, and the distributions in (5) corresponding to e = 0 and e = 1, respectively. Also, note that S is such that…”

Section: B the Complementary Energy Levels And Distribution Of R Bmentioning

confidence: 99%

“…where g (r B |(i, j), e = 0) and g (r B |(i, j), e = 1) are the PDFs given in (5) and i is the complement of i. Since solving the error performance of the JMAP decoder using the Gaussian mixtures in (10) is non-trivial, we approximate the JMAP decoder by only considering the dominant terms in the summation of (10) [16] to obtain…”

Section: Joint Maximum a Posteriori (Jmap) Decoder For Nc-fffd Relayi...mentioning

confidence: 99%

Constellation Design for Non-Coherent Fast-Forward Relays to Mitigate Full-Duplex Jamming Attacks

Chaudhary¹,

Harshan²

2022

Preprint

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With potential applications to short-packet communication, we address communication of low-latency messages in fast-fading channels under the presence of a reactive jammer. Unlike a traditional jammer, we assume a full-duplex (FD) jammer capable of detecting pre-existing countermeasures and subsequently changing the target frequency band. To facilitate reliable communication amidst a strong adversary, we propose non-coherent fast-forward full-duplex relaying scheme wherein the victim uses a helper in its vicinity to fast-forward its messages to the base station, in addition to ensuring that the countermeasures are undetected by the FD adversary. Towards designing the constellations for the proposed scheme, we identify that existing non-coherent constellation for fast-fading channels are not applicable owing to the cooperative nature of the fast-forward scheme. As a result, we formulate an optimization problem of designing the non-coherent constellations at the victim and the helper such that the symbol-error-probability at the base station is minimized. We theoretically analyze the optimization problem and propose several strategies to compute near-optimal constellations based on the helper's data-rate and fast-forwarding abilities. We show that the proposed constellations provide near-optimal error performance and help the victim evade jamming.Finally, we also prove the scheme's efficacy in deceiving the countermeasure detectors at the jammer.

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“…For the receiver to retrieve the desired signal in a FD transmission, the majority of conventional SI cancellation schemes, e.g., Zhang et al (2019); Chung et al (2015); Anttila et al (2021), rely on the SI suppression, where the SI is firstly reconstructed and then subtracted from the received signal. Different from this design, we will exploit the pseudo-Doppler effect to completely remove the SI from the desired signal at the fundamental frequency.…”

Section: Pseudo-doppler Aided Si Cancellationmentioning

confidence: 99%

“…In (Chung et al, 2015), the SI was suppressed by 103 dB, where the antenna isolation, analog and digital cancellations contributed 42 dB, 18 and 43 dB, respectively. In (Anttila et al, 2021), a real-time digital cancellation of 46 dB contributed towards a SI suppression of 103 dB.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-doppler aided cancellation of self-interference in full-duplex communications

Zheng

Yang

2022

Front. Signal Process.

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In this work, a novel scheme is proposed to enhance the self-interference (SI) cancellation in full-duplex communications. Beyond conventional SI cancellation schemes that rely on the SI suppression, our proposed scheme exploits periodic antenna switching to generate the pseudo-Doppler effect, thus completely removing the SI at the fundamental frequency. In this way, the desired signal is readily obtained through a low-pass filter. For the purpose of performance evaluation, the SI cancellation capability is defined as the difference between the output signal-to-interference-plus-noise ratio (SINR) and the input SINR. Theoretical formulations and numerical results validate that our pseudo-Doppler aided scheme has higher SI cancellation capability than the conventional SI suppression schemes. Moreover, the impact of the SI suppression achieved by conventional schemes and the influence of antenna switching timing difference on the practical implementation of the proposed scheme are investigated, to further substantiate the validity of our pseudo-Doppler aided SI cancellation.

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Full-Duplexing With SDR Devices: Algorithms, FPGA Implementation, and Real-Time Results

Cited by 24 publications

References 47 publications

WIP: Achieving Self-Interference-Free Operation on SDR Platform with Critical TDD Turnaround Time

WIP: Achieving Self-Interference-Free Operation on SDR Platform with Critical TDD Turnaround Time

Constellation Design for Non-Coherent Fast-Forward Relays to Mitigate Full-Duplex Jamming Attacks

Pseudo-doppler aided cancellation of self-interference in full-duplex communications

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