Green Wireless Communications: A Time-Reversal Paradigm

Wang, Beibei; Wu, Yongle; Han, Feng; Yang, Yunjuan; Liu, K. J. Ray

doi:10.1109/jsac.2011.110918

Cited by 184 publications

(132 citation statements)

References 19 publications

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“…2) Channel stationarity: the channel impulse responses (CIRs) are assumed to be stationary for at least one probing-and-transmitting cycle. These two assumptions generally hold in reality, especially for indoor environment, as validated through real experiments in [55] and [24]. In [55], Qiu et al conducted experiments in a campus lab area and showed that the correlation between the impulse response of the forward link channel and that of backward link channel is as high as about 0.98, which means that the channel is highly reciprocal.…”

Section: A the Basic Principles Of Trmentioning

confidence: 96%

“…Since TR can make full use of multi-path propagation and also requires no complicated channel processing and equalization, it was later verified and tested in wireless radio communication systems. Experimental validations of TR technique with EM waves have been conducted in [24], [39]- [45], including the demonstration of spatial and temporal focusing properties [24], [39]- [45] and channel reciprocity [24], [41]. The feasibility of applying TR technique into ultra-wideband (UWB) communications has been studied in [46]- [48] with the focus on the bit error rate (BER) performance through simulation.…”

Section: A the Basic Principles Of Trmentioning

confidence: 99%

“…A natural question to ask is: is there a wireless communication technique that can address most, if not all, challenges? As pointed out in [24], time-reversal (TR) signal transmission is an ideal paradigm for low-complexity, low energy consumption green wireless communication because of its inherent nature to fully harvest energy from the surrounding environment by exploiting the multi-path propagation to recollect all the signal energy that could be collected as the ideal RAKE receiver. The theoretic analysis in [24] shows that a typical TR system has a potential of over an order of magnitude of reduction in power consumption and interference alleviation, which means that TR system can provide better battery life and support multiple concurrent active users.…”

Section: Introductionmentioning

confidence: 99%

“…As pointed out in [24], time-reversal (TR) signal transmission is an ideal paradigm for low-complexity, low energy consumption green wireless communication because of its inherent nature to fully harvest energy from the surrounding environment by exploiting the multi-path propagation to recollect all the signal energy that could be collected as the ideal RAKE receiver. The theoretic analysis in [24] shows that a typical TR system has a potential of over an order of magnitude of reduction in power consumption and interference alleviation, which means that TR system can provide better battery life and support multiple concurrent active users. Moreover, with our proposed asymmetric TR architecture, only one-tap detection is needed at the receiver side [25], thus the computational complexity at the terminal devices is low, which means the cost of the terminal devices is also low.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the TR system can easily support heterogeneous terminal devices by providing various QoS options through adjusting the waveform and backoff factor [25], [27]. Finally, the unique location-specific signature in TR system can provide additional physical-layer security and thus can enhance the privacy and security of customers in IoT [24]. Overall, we will provide an overview to show that TR technique is an ideal paradigm for IoT.…”

Section: Introductionmentioning

confidence: 99%

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Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Chen

Han

Yang

et al. 2014

IEEE Internet Things J.

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116

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Abstract-In this paper, we present an overview of the timereversal (TR) wireless paradigm for green Internet of Things (IoT). It is shown that the TR technique is a promising technique that focuses signal waves in both time and space domains. The unique asymmetric architecture significantly reduces the cost of the terminal devices, the total number of which is expected to be very large for IoT. The focusing effect of the TR technique can harvest the energy of all the multi-paths at the receiver, which improves the energy efficiency of the wireless transmission and thus the battery life of terminal devices in IoT. Facilitated by the high-resolution spatial focusing, the TR division multiple access scheme leverages the uniqueness of the multi-path profiles in the rich-scattering environment and maps them into location-specific signatures, so that spatial multiplexing can be achieved for multiple users operating on the same spectrum. In addition, the TR system can easily support heterogeneous terminal devices by providing various quality-of-service (QoS) options through adjusting the waveform and rate backoff factor. Finally, the unique location-specific signature in TR system can provide additional physical-layer security and thus can enhance the privacy and security of customers in IoT. All the advantages show that the TR technique is a promising paradigm for IoT.Index Terms-Internet of Things (IoT), spatial focusing, temporal focusing, time reversal (TR), time-reversal division multiple access (TRDMA).

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Section: A the Basic Principles Of Trmentioning

confidence: 96%

Section: A the Basic Principles Of Trmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Chen

Han

Yang

et al. 2014

IEEE Internet Things J.

Self Cite

116

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Time Reversal in Electromagnetics

Hoefer

2018

Wiley Encyclopedia of Electrical and Electronics Engineering

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This chapter addresses the reader who wishes to explore the theory and practice of time reversal, and to obtain an overview of the concepts, definitions, and applications of time reversal methods. Having no natural sense of negative time flow, we must resort to our imagination to describe what happens to physical phenomena, notably the behavior of waves in space and time, when time is reversed. The meaning of time reversal in mechanics and wave propagation is discussed in general terms, and the nature of one‐dimensional causal and acausal electromagnetic waves is explained by means of computer visualizations. The concept of the time reversal mirror as an active transmitter of time‐reversed incident fields is demonstrated and extended to two‐ and three‐dimensional scenarios. The principles of radiating and scattering source reconstruction in both open and closed ergodic structures are introduced and illustrated by means of typical modeling examples. Classical and algorithmic formulations of time reversal in terms of Green's functions lead to an interpretation of time reversal focusing in space and time as a correlation process. Superresolution as a consequence of multiple scattering or multipath propagation is demonstrated. A selected list of references containing seminal papers, books, reviews, and applications of time reversal in different areas of acoustics, electromagnetics, and optics concludes the chapter. The references provide in‐depth coverage of the fundamental concepts presented in this chapter and will guide the reader toward application‐specific extensions of the theory and numerical models for advanced researchers and practitioners of time reversal.

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Robust pre‐filtering based space division multiple access over multi‐path channels

2013

Trans Emerging Tel Tech

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A novel concept of time reversal division multiple access (TRDMA) is proposed recently as a low complexity, energy efficient wireless multi‐user access method. In this paper, we first generalize TRDMA as a pre‐filtering based space division multiple access communication system, where each user's signature waveform is derived from the information of channel impulse responses (CIRs) between basestation and location specific multiple mobile stations. We develop two pre‐filtering schemes: one is referred to as time reversal matched filter. The benefit of the time reversal matched filter is to fully collect energy at the sampling instant of the intended mobile station (spatial and temporal focusing). The second pre‐filter, which is referred to as zero‐forcing pre‐filter (ZFPF), is derived to meet the zero‐forcing criterion such that multi‐user interference is completely eliminated. However, because the uplink CIR is generally different from the downlink CIR, we present extensive analysis on the performance degradation of the ZFPF caused by this mismatched effect. Furthermore, to improve the robustness to mismatch, we propose a simple yet effective robust ZFPF. We investigate and compare the performances of both schemes under various scenarios in terms of power consumption and averaged signal‐to‐interference‐plus‐noise power ratio. It is shown in both analytical and simulation results that satisfying performance can be achieved by the proposed pre‐filtering system. Moreover, we demonstrate that the proposed robust‐ZFPF has improved the performance in mismatched condition. Copyright © 2013 John Wiley & Sons, Ltd.

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Green Wireless Communications: A Time-Reversal Paradigm

Cited by 184 publications

References 19 publications

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Time Reversal in Electromagnetics

Robust pre‐filtering based space division multiple access over multi‐path channels

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