Modulation in the Air: Backscatter Communication Over Ambient OFDM Carrier

Yang, Gang; Liang, Ying-Chang; Zhang, Rui; Pei, Yiyang

doi:10.1109/tcomm.2017.2772261

Cited by 300 publications

(200 citation statements)

References 37 publications

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“…which plays a key role in deriving the transceiver in [16]. Letb t denote the signal transmitted by the BD in the timedomain.…”

Section: A With Repeating Structurementioning

confidence: 99%

“…Letb t denote the signal transmitted by the BD in the timedomain. To exploit the repeating structure in (4), the following signal is considered in [16]:…”

Section: A With Repeating Structurementioning

confidence: 99%

“…Unlike [12], it does not require that the ambient transmitter is also the receiver to mitigate wideband direct-link interference. Furthermore, as opposed to [16], the proposed approach is applicable even if the length of CP is short. since the repeating structure is not employed.…”

Section: Introductionmentioning

confidence: 99%

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Matched-Filter-Based Backscatter Communication for IoT Devices Over Ambient OFDM Carrier

Choi

2019

IEEE Internet Things J.

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In this paper, we study backscatter communication (BC) for power-limited devices that are connected to a network for the Internet of Things (IoT), where joint estimation and detection is carried out at a receiver to detect signals from a backscatter device (BD) with ambient orthogonal frequency division multiplexing (OFDM) carrier. In conventional BC, in order to avoid the difficulty of the carrier estimation, the energy detector is usually considered at a receiver at the cost of poor performance. To improve the performance, in this paper, we consider a novel approach that allows the carrier estimation at the receiver via joint estimation and detection. In particular, in the proposed approach, the matched-filtering at the BD (for the transmitter filter) is employed to impose a certain property that allows efficient and reliable carrier estimation via joint estimation and detection. Through the performance analysis and simulation results, we show that the matched-filtering at the BD in the proposed approach can improve the performance.

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“…which plays a key role in deriving the transceiver in [16]. Letb t denote the signal transmitted by the BD in the timedomain.…”

Section: A With Repeating Structurementioning

confidence: 99%

“…Letb t denote the signal transmitted by the BD in the timedomain. To exploit the repeating structure in (4), the following signal is considered in [16]:…”

Section: A With Repeating Structurementioning

confidence: 99%

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Matched-Filter-Based Backscatter Communication for IoT Devices Over Ambient OFDM Carrier

Choi

2019

IEEE Internet Things J.

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“…The locations of CE m ∈ M and BD k ∈ K m are denoted by u m ∈ R 2×1 and w m,k ∈ R 2×1 , 7 respectively. The exact locations of the CEs and BDs on the ground are assumed to be known by a central controller of the system.…”

Section: A System Descriptionmentioning

confidence: 99%

“…The time complexity of Algorithm 1 is polynomial. In each iteration, only a linear MIP problem (7) is solved by using the cutting-plane technique, and two FP problems (8) as well as (16) are solved by using the Dinkelbach's method which needs to solve a series of convex problems.…”

Section: E Convergence and Complexity Analysismentioning

confidence: 99%

Energy-Efficient UAV Backscatter Communication with Joint Trajectory and Resource Optimization

Yang

Dai

Liang

2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

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Backscatter communication which enables wireless-powered backscatter devices (BDs) to transmit information by reflecting incident signals, is an energy-and cost-efficient communication technology for Internetof-Things. This paper considers an unmanned aerial vehicle (UAV)-assisted backscatter communication network (UBCN) consisting of multiple BDs and carrier emitters (CEs) on the ground as well as a UAV.A communicate-while-fly scheme is first designed, in which the BDs illuminated by their associated CEs transmit information to the flying UAV in a time-division-multiple-access manner. Considering the critical issue of the UAV's limited on-board energy and the CEs' transmission energy, we maximize the energy efficiency (EE) of the UBCN by jointly optimizing the UAV's trajectory, the BDs' scheduling, and the CEs' transmission power, subject to the BDs' throughput constraints and harvested energy constraints, as well as other practical constraints. Furthermore, we propose an iterative algorithm based on the block coordinated decent method to solve the formulated mixed-integer non-convex problem, in each iteration of which the variables are alternatively optimized by leveraging the cutting-plane technique, the Dinkelbach's method and the successive convex approximation technique. Also, the convergence and complexity of the proposed algorithm are analyzed. Finally, simulation results show that the proposed communicate-while-fly scheme The conference version [1] of this paper was presented 2 achieves significant EE gains compared with the benchmark hover-and-fly scheme. Useful insights on the optimal trajectory design and resource allocation are also obtained. Index TermsBackscatter communication, UAV communication, energy efficiency, trajectory design, resource optimization, iterative algorithm. I. INTRODUCTION A. MotivationInternet-of-Things (IoT) is revolutionizing the way we live by providing ubiquitous connectivity among billions of devices [2]. Backscatter communication (BackCom) enables passive backscatter devices (BDs) to transmit information by modulating incident sinusoidal carriers or ambient radiofrequency (RF) carriers without using any power-hungry or complex RF transmitters, and thus is an energy-and cost-efficient communication technology for IoT devices that typically have limited battery energy and strict cost constraint [3]-[12]. Specifically, the bistatic BackCom (BBC) systems with spatially separated carrier emitters (CEs) and backscatter receivers (BRs) [8] were demonstrated to achieve a communication range on the order of hundreds of meters [9] [10], and has various applications such as monitoring environmental humidity and soil moisture [13].However, the current BBC systems with fixed BRs face two main challenges. First, it is costinefficient to directly deploy a BBC network for data collection in large-scale IoT. Since the communication range of BBC is shorter than that of traditional communication with active radio, many expensive BRs are needed to cover massive BDs. Second, the transmission ...

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