All-Digital Self-Interference Cancellation Technique for Full-Duplex Systems

Ahmed, E.; Eltawil, Ahmed M.

doi:10.1109/twc.2015.2407876

Cited by 356 publications

(255 citation statements)

References 26 publications

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“…As discussed in Section 1, even with state-of-the-art passive suppression and analog cancellation, the SIR can still be around − 5 dB [5,40]. Hence, we adopt this value of the SIR in the simulations while assuming that the communication channel has average energy of unity, i.e., E |h ba | 2 = σ 2 h ba = 1.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Superimposed signaling inspired channel estimation in full-duplex systems

Koohian

Mehrpouyan

Nasir

et al. 2018

EURASIP J. Adv. Signal Process.

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Residual self-interference (SI) cancellation in the digital baseband is an important problem in full-duplex (FD) communication systems. In this paper, we propose a new technique for estimating the SI and communication channels in a FD communication system, which is inspired from superimposed signaling. In our proposed technique, we add a constant real number to each constellation point of a conventional modulation constellation to yield asymmetric shifted modulation constellations with respect to the origin. We show mathematically that such constellations can be used for bandwidth efficient channel estimation without ambiguity. We propose an expectation maximization (EM) estimator for use with the asymmetric shifted modulation constellations. We derive a closed-form lower bound for the mean square error (MSE) of the channel estimation error, which allows us to find the minimum shift energy needed for accurate channel estimation in a given FD communication system. The simulation results show that the proposed technique outperforms the data-aided channel estimation method, under the condition that the pilots use the same extra energy as the shift, both in terms of MSE of channel estimation error and bit error rate. The proposed technique is also robust to an increasing power of the SI signal.

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Section: Simulation Resultsmentioning

confidence: 99%

“…These unknown transmitted symbols can be treated as hidden data. A common approach to solving the maximization problem in (10) in the presence of hidden data is the EM algorithm [33], which is adopted in this work. The main steps of EM algorithm are 1.…”

Section: Em-based Estimatormentioning

confidence: 99%

Superimposed signaling inspired channel estimation in full-duplex systems

Koohian

Mehrpouyan

Nasir

et al. 2018

EURASIP J. Adv. Signal Process.

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“…The residue of self-interference, n s , is the component that is seen by the relay decoder. Several works to date [27][28][29] have used a Gaussian model for n s , an approximation that is confirmed by various measurements [30,31]. Therefore, the combinationñ 2 = n 2 + n s is also Gaussian with the appropriate variance.…”

Section: The Relay Channelmentioning

confidence: 89%

Multilevel Coding for the Full-Duplex Decode-Compress-Forward Relay Channel

Abotabl

Nosratinia

2017

Entropy

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Abstract:The Decode-Compress-Forward (DCF) is a generalization of Decode-Forward (DF) and Compress-Forward (CF). This paper investigates conditions under which DCF offers gains over DF and CF, addresses the problem of coded modulation for DCF, and evaluates the performance of DCF coded modulation implemented via low-density parity-check (LDPC) codes and polar codes. We begin by revisiting the achievable rate of DCF in discrete memoryless channels under backward decoding. We then study coded modulation for the decode-compress-forward via multi-level coding. We show that the proposed multilevel coding approaches the known achievable rates of DCF. The proposed multilevel coding is implemented (and its performance verified) via a combination of standard DVB-S2 LDPC codes, and polar codes whose design follows the method of Blasco-Serrano.

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“…Previous works have also used digital cancellation to compensate for nonidealities in the TX and RX chains from active components, and phase noise [4,[20][21][22][23][24][25]. Here, the linear and nonlinear distortions can be estimate using complex models to account for the dynamic TX signal through the components.…”

Section: Digital Cancellationmentioning

confidence: 99%

Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios

King

Xia

Boumaiza

2018

IEEE Trans. Circuits Syst. II

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The ever-increasing demand for more data from users is pushing the development of alternative wireless technologies to improve upon network capacity. Full-Duplex radios provide an exciting opportunity to theoretically double the available spectral efficiency of wireless networks by simultaneously transmitting and receiving signals in the same frequency band.The main challenge that is presented in the implementation of a full-duplex radio is the high power transmitter leaking to the sensitive receiver chain and masking the desired receive signal to be decoded. This transmitter leakage is referred to as self interference and it is required that this self interference signal be cancelled below the receiver noise floor to achieve the full benefits of a full-duplex radio. Cancellation of the self interference signal is realized through several techniques, categorized as passive suppression, digital cancellation, and analog cancellation. These methods all have their challenges in achieving the full amount of cancellation necessary and therefore all three techniques are typically employed in the system.In this thesis, a novel digitally assisted radio frequency (RF) analog self interference canceller is proposed to suppress the self interference signal before the receiver chain for wide modulation bandwidth signals. This canceller augments minimum complexity RFanalog interference cancellation hardware that uses an RF vector multiplier in combination with a flexible digital rational function finite impulse response filter. The simple topology reduces the number of impairments added to the system through the analog components and identifies the parameters of the proposed filter in a deterministic and single iteration algorithm.The hardware proof-of-concept prototype is built using off-the-shelf RF-analog components and demonstrates excellent cancellation performance. Using four TX test signals with modulation bandwidths of 20 MHz, 40 MHz, 80 MHz, and 120 MHz, the self interference canceller achieves a minimum of 50 dB, 47 dB, 42 dB, and 40 dB of cancellation respectively. This thesis reviews the previously proposed self interference cancellation topologies, system non-idealities that provide challenges for full-duplex implementation, and the realization of the proposed RF-analog self interference canceller.iii Acknowledgements I would like to thank my supervisor, Dr. Slim Boumaiza, for giving me guidance, advice, and confidence throughout my Masters process. He has taught me how to properly conduct research, approach problems and allowed me to pursue a topic that suited my interests. The entire Emerging Radio Systems Group (EmRG) consists of intelligent, kind and helpful members who I have also learned a lot from and enjoyed working with.I would also like to acknowledge my incredible family and friends who have offered continuous love and support throughout this lengthy Masters process.Finally, I would like to dedicate this thesis to my husband, Michael, for his love, patience, and calming influence while pushing ...

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All-Digital Self-Interference Cancellation Technique for Full-Duplex Systems

Cited by 356 publications

References 26 publications

Superimposed signaling inspired channel estimation in full-duplex systems

Superimposed signaling inspired channel estimation in full-duplex systems

Multilevel Coding for the Full-Duplex Decode-Compress-Forward Relay Channel

Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios

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