Full duplex radios

By Dinesh Bharadia, Emily McMilin, Sachin Rajsekhar Katti. Conference on Applications, Technologies, Architectures, and Protocols for Computer Communication, 2013

2,184 citations recorded by the source corpus.

This paper presents the design and implementation of the first in-band full duplex WiFi radios that can simultaneously transmit and receive on the same channel using standard WiFi 802.11ac PHYs and achieves close to the theoretical doubling of throughput in all practical deployment scenarios. Our design uses a single antenna for simultaneous TX/RX (i.e., the same resources as a standard half duplex system). We also propose novel analog and digital cancellation techniques that cancel the self interference to the receiver noise floor, and therefore ensure that there is no degradation to the received signal. We prototype our design by building our own analog circuit boards and integrating them with a fully WiFi-PHY compatible software radio implementation. We show experimentally that our design works robustly in noisy indoor environments, and provides close to the expected theoretical doubling of throughput in practice.

Subfields: Aerospace Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/37a3021a3c9bf25cfe37ce65d0c41be119249999

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. Rui Zhang
2. Qingqing Wu
3. Robert Schober
4. Jie Xu
5. Derrick Wing Kwan Ng
6. Lajos Hanzo
7. Zhiguo Ding
8. Yong Zeng

In Electrical and Electronic Engineering

1. Rui Zhang
2. Qingqing Wu
3. Robert Schober
4. Lajos Hanzo
5. Derrick Wing Kwan Ng
6. Jie Xu
7. Zhiguo Ding
8. Yong Zeng

Citations in the corpus

• Full-Duplex Transceiver System Calculations: Analysis of ADC and Linearity Challenges (2014, methodology): “For generality, a multi-tap RF cancellation circuit, as presented in [13], [24], is assumed in this paper.”
• A Survey of In-Band Full-Duplex Transmission: From the Perspective of PHY and MAC Layers (2015, methodology): “The authors of [13], [52], [55], [56] designed their hardware platforms for evaluating the IBFD system with larger system bandwidth or with different center frequencies.”
• Fundamental Green Tradeoffs: Progresses, Challenges, and Impacts on 5G Networks (2016, background): “1) Theoretical Achievements: Typical NOA technologies include full duplexing (FD) [44], device-to-device (D2D) [45], and Non-Orthogonal Multiple Access (NOMA) [46], where FD focuses on the self-interference cancellation and the”
• Full-Duplex Wireless Communications: Challenges, Solutions, and Future Research Directions (2016, methodology): “· Apart from that, another method of generating the RF reference signal is to view the SI cancellation as a sampling and interpolation problem, which can be resolved relying on the delay-line-based analog circuit [11].”
• Optimal Joint Power and Subcarrier Allocation for Full-Duplex Multicarrier Non-Orthogonal Multiple Access Systems (2016, background): “1We note that FD radio prototypes equipped with a circulator can transmit and receive signals simultaneously with a single antenna [14] .”
• All-Digital Self-Interference Cancellation Technique for Full-Duplex Systems (2014, methodology): “This issue has been handled in [7], where a multi-tap RF finite impulse response (FIR) filter is used instead of the single attenuator.”
• A Survey of 5G Network: Architecture and Emerging Technologies (2015, background): “If any residual self-interference is not completely canceled, then it will acts as noise to the received signal, which in turn reduces SNR and subsequently throughput [82].”
• In-Band Full-Duplex Technology: Techniques and Systems Survey (2019, methodology): “methods in the analog and digital domains [155]–[157], and seven systems exploited techniques within the propagation and”
• In-Band Full-Duplex Wireless: Challenges and Opportunities (2013, methodology): “recently proposed [31], [40], [91], [94]–[96] that take into account the impairments introduced by the transmit radio chain.”
• Dual-Polarized, Differential Fed Microstrip Patch Antennas With Very High Interport Isolation for Full-Duplex Communication (2017, methodology): “The total amount of suppressed SI is considered as figure of merit for IBFD radio transceiver because the residual SI degrades the achievable throughput of IBFD system [1], [2].”
• Optimal Resource Allocation in Full-Duplex Wireless-Powered Communication Network (2014, background): “By state-of-the-art SIC techniques today, it has been reported that SIC up to 110 dB higher power of the desired signal can be implemented [25].”
• Full duplex techniques for 5G networks: self-interference cancellation, protocol design, and relay selection (2015, background): “Existing studies [5, 6] showed that it is critical to accurately measure and suppress the SI in FD communication.”
• Widely Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver (2014, methodology): “from the findings of these studies, novel nonlinear cancellation processing solutions have been recently proposed in [14], [17], and [18] to suppress such nonlinear SI, in addition to plain”
• Proactive eavesdropping via cognitive jamming in fading channels (2015, methodology): “al SIC schemes [22]. Note that the implementation of SIC requires the legitimate monitor to know the loop-back channel from the jamming to the eavesdropping antennas (via efficient channel estimation) [15]. Next, the legitimate mo nitor perfectly knows the global CSI of suspicious, eavesdropping, and”
• A survey on 5G: The next generation of mobile communication (2015, methodology): “5), full duplex radios [27] (Section 6), NFV, and SDN based architectures [14, 78, 97, 119] (Section 6).”
• Full-Duplex OFDM Radar With LTE and 5G NR Waveforms: Challenges, Solutions, and Measurements (2019, background): “The fact that the receiver must be operating simultaneously while transmitting, and at the same carrier frequency, leads to large implementation challenges, particularly in facilitating sufficient transmitter–receiver isolation [12], [19], [23], [28], [37]–[40].”
• BackFi: High Throughput WiFi Backscatter (2015, methodology): “This is consistent with earlier self-interference cancellation results from prior work [12, 11] which report a self-interference residue of 1 .”
• Multi-Person Localization via RF Body Reflections (2015, methodology): “In the communications community, we refer to such techniques as successive interference cancellation, and they have been used in a large number of applications such as ZigZag [12], VBLAST [37], and full duplex [6].”