Real-time implementation of physical-layer network coding

Lu, Lu; You, Lizhao; Yang, Qing; Wang, Taotao; Zhang, Minglong; Zhang, Shengli; Liew, Soung Chang

doi:10.1145/2491246.2491256

Cited by 45 publications

(37 citation statements)

References 13 publications

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“…The current paper extends [31] to a more general timeslotted MAC protocol, and demonstrated a complete system supporting real TCP/IP applications.…”

Section: Related Workmentioning

confidence: 86%

“…Link-layer Protocols for PNC-enabled Systems: Lu et al [31] presented the first real-time implementation of a PNC system, and designed a burst mode MAC protocol where a dedicated beacon frame triggers a burst of uplink transmissions. The current paper extends [31] to a more general timeslotted MAC protocol, and demonstrated a complete system supporting real TCP/IP applications.…”

Section: Related Workmentioning

confidence: 99%

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Reliable Physical-Layer Network Coding Supporting Real Applications

You

Liew

2017

IEEE Trans. on Mobile Comput.

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Abstract-This paper presents the first reliable physical-layer network coding (PNC) system that supports real TCP/IP applications for the two-way relay network (TWRN). Theoretically, PNC could boost the throughput of TWRN by a factor of 2 compared with traditional scheduling (TS) in the high signal-to-noise (SNR) regime. Although there have been many theoretical studies on PNC performance, there have been relatively few experimental and implementation efforts. Our earlier PNC prototype, built in 2012, was an offline system that processed signals offline. For a system that supports real applications, signals must be processed online in real-time. Our real-time reliable PNC prototype, referred to as RPNC, solves a number of key challenges to enable the support of real TCP/IP applications. The enabling components include: 1) a time-slotted system that achieves µs-level synchronization for the PNC system; 2) reduction of PNC signal processing complexity to meet real-time constraints; 3) an ARQ design tailored for PNC to ensure reliable packet delivery; 4) an interface to the application layer. We took on the challenge to implement all the above with general-purpose processors in PC through an SDR platform rather than ASIC or FPGA. With all these components, we have successfully demonstrated image exchange with TCP and two-party video conferencing with UDP over RPNC. Experimental results show that the achieved throughput approaches the PHY-layer data rate at high SNR, demonstrating the high efficiency of the RPNC system.

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“…The current paper extends [31] to a more general timeslotted MAC protocol, and demonstrated a complete system supporting real TCP/IP applications.…”

Section: Related Workmentioning

confidence: 86%

Section: Related Workmentioning

confidence: 99%

Reliable Physical-Layer Network Coding Supporting Real Applications

You

Liew

2017

IEEE Trans. on Mobile Comput.

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“…Large relative CFO may cause strong inter-carrier interference (ICI) [10]. In our current implementation, thanks to the accuracy of our GPS clocks [8], the relative CFO at the AP is in the ballpark of 200 to 300 Hz only, much smaller than the subcarrier bandwidth 78.125 KHz.…”

Section: A Implementationmentioning

confidence: 99%

Network-Coded Multiple Access II: Toward Real-Time Operation With Improved Performance

You

Liew

2015

IEEE J. Select. Areas Commun.

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This paper presents a first real-time network-coded multiple access (NCMA) system that jointly exploits physical (PHY)-layer network coding (PNC) and multiuser decoding (MUD) to boost the throughput of a wireless local area network (WLAN). NCMA is a new design paradigm for multipacket reception wireless networks, in which the access point can receive and decode several packets simultaneously transmitted by multiple users. Conventionally, multipacket reception is realized using MUD only, whereas the key idea of NCMA is to use PNC together with MUD to realize multipacket reception. Although the feasibility of NCMA has previously been studied by the authors, our previous NCMA prototype was a version with offline signal processing. In addition, our previous investigation left open a number of theoretical and implementation issues, the resolution of which is critical to the adoption of NCMA in real practice. The current investigation makes the following state-of-the-art contributions toward NCMA: 1) we demonstrate a first NCMA system with integrated real-time PHY-and MAC-layer decoding; 2) we construct a new unified framework for MAC-layer decoding that yields higher throughput with faster decoding-the faster decoding is one of the key enablers of our real-time implementation; and 3) we design new PHY-layer decoding techniques that overcome the poor performance of the first-generation NCMA prototype at low SNR. Experimental results show that, compared with the previous NCMA prototype, our new NCMA prototype improves real-time throughput by more than 100% at medium-high SNR (≥ 8 dB).

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“…The TWRN system consists of two end nodes, A and B, that exchange their information via a relay node, R, simultaneously. PLNC can potentially elevate the throughput of a traditional TWRN by 100 % [2], [3]. To relay information, PLNC can utilize various strategies at the relay, such as amplify-and-forward (AF) and denoise-andforward (DNF) [4].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of PLNC using hierarchical modulation

Awny

Tsimenidis

Chambers

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-In this paper, we propose and analyze the performance of a two-way relay network (TWRN) using physical layer network coding (PLNC) with hierarchical modulation (HM). The performance is evaluated for additive white Gaussian noise (AWGN) channels. The TWRN consists of two end nodes and a relay, where each node has a single antenna and operates in a half-duplex mode. Using an analytical approach, we derive the end-to-end symbol error rate (SER) performance expression of the 4/16-QAM HM for the high priority (HP) and the low priority (LP) streams, respectively, as a function of signal-to-noise ratio (SNR). It has been found the analytical and simulation results are in close agreement. The utilization of the proposed HM-PLNC system minimizes the computational complexity of the denoise and forward (DNF) operations at the relay by reducing the number of Euclidean distance computations required to 18 compared to the 49 required in an equivalent 16-QAM based PLNC system. Index Terms-Hierarchical modulation (HM), physical layer network coding (PLNC), denoise and forward (DNF), two-way relay network (TWRN), half-duplex (HD)

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Real-time implementation of physical-layer network coding

Cited by 45 publications

References 13 publications

Reliable Physical-Layer Network Coding Supporting Real Applications

Reliable Physical-Layer Network Coding Supporting Real Applications

Network-Coded Multiple Access II: Toward Real-Time Operation With Improved Performance

Performance analysis of PLNC using hierarchical modulation

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