Mitigating Doppler effects on physical-layer network coding in VANET

Xie, Li; Ho, Ivan Wang‐Hei; Liew, Soung Chang; Lu, Lu; Lau, Francis C. M.

doi:10.1109/pimrc.2015.7343280

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…This section studies the effect of CFO in PNC on the SINR at the relay. We analyze the CFO effect based on the output of the correlators as given in ( 11) and (13).…”

Section: Impact Of Cfo On Sinr In Pncmentioning

confidence: 99%

“…We first define the SINR at one subcarrier in PNC. At the m-th correlator or subcarrier, from either (11) or (13) we find that (i) the power of the desired signal, a 0,i s i [m], from node i is given by P…”

Section: A Sinr In Pncmentioning

confidence: 99%

“…This paper aims to address this issue and explore the physical-layer feasibility of PNC in MANETs with signal processing techniques to reduce the impact of CFO/ICI. Compared with our previous work [12], [13], the major contributions of this paper are summarized as follows.…”

Section: Introductionmentioning

confidence: 99%

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The Feasibility of Mobile Physical-Layer Network Coding with BPSK Modulation

Xie

Liew

et al. 2016

IEEE Trans. Veh. Technol.

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This paper considers applying Physical-layer Network Coding (PNC) to OFDM modulated Mobile Ad-hoc Networks (MANETs) to resolve the outstanding issue of short contact time between nodes due to their mobility. Ideally, PNC enables data exchange twice faster than traditional scheduling and thus, it is a potential performance booster in MANETs. However, application of PNC in MANETs is challenged by the carrier frequency offset (CFO) problem inherently caused by nodemotion induced Doppler shifts and asynchronous oscillators. CFO induces inter-carrier interference (ICI) that degrades PNC performance. In this paper, we investigate the CFO/ICI impact on the signal-to-interference-and-noise ratio (SINR) and bit error rate (BER) in the signal detection of PNC in a two-way relay channel (TWRC) based on BPSK modulation. We find that PNC with power control suffers at most 3 dB SINR penalty compared with generic point-to-point communications in both the flat fading and the frequency-selective channels. Also, we find that a belief propagation (BP) algorithm could be employed in the signal detection of PNC to effectively tackle ICI and reduce its impact on the BER of PNC. For CFO compensation in PNC, we propose a method that amounts to positioning the relay's local oscillator frequency at the middle of the received frequencies from the two end nodes in the TWRC. Importantly, we show that (i) this compensation method can theoretically maximize the worst SINR in PNC; and (ii) in case of similar CFO of the two uplinks in TWRC, it allows PNC to achieve a BER at the relay close to that in the ideal case, i.e., in point-to-point communications without CFO. Overall, this paper demonstrates that mobile PNC is feasible in general, laying the foundation for future studies.

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“…This section studies the effect of CFO in PNC on the SINR at the relay. We analyze the CFO effect based on the output of the correlators as given in ( 11) and (13).…”

Section: Impact Of Cfo On Sinr In Pncmentioning

confidence: 99%

Section: A Sinr In Pncmentioning

confidence: 99%

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The Feasibility of Mobile Physical-Layer Network Coding with BPSK Modulation

Xie

Liew

et al. 2016

IEEE Trans. Veh. Technol.

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“…In this paper, they take the location that VANETs would indeed turn out to be the networking stand that would support the prospect vehicular applications [9].…”

Section: Overview Of Prior Workmentioning

confidence: 99%

Data Transmission in VANETS: A Review, Applications, Routing Protocols

Samiksha¹,

Kaur²

2016

IJCA

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A novel kind of ad hoc network is defeating the roads: Vehicular Ad Hoc Networks. In these networks, vehicles communicate with each other and perhaps with a roadside infrastructure to provide a long list of requests varying from transit safety to driver support and Internet access. Security is a vital concern for many Vehicular Ad-hoc Network applications. One specific serious attack, known as Sybil attack, against ad hoc networks involves an attacker illegally claiming multiple identities. In these networks, information of the real-time position of nodes is a supposition made by most protocols, algorithms, and requests. This is a very reasonable assumption, since GPS receivers can be fitted easily in vehicles, a number of which already comes with this technology. In this method, each Road Side Unit calculates and stores different parameter values (Signal Strength, distance) after receiving the inspiration packets from nearby vehicles.

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