Analysis of phase-conjugating arrays in multiple-interrogator environments

Chun, Tyler F.; Watanabe, Monte; Zamora, Alexis; Iwami, Reece T.; Akagi, Justin M.; Shiroma, Wayne A.

doi:10.1109/icwits.2010.5611879

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…RDAs suffer from the inability to distinguish the pilot-tone signal, originated from a desired direction, from an identical frequency signal, which may be radiated unintentionally or intentionally from different directions. The consequence of this is that the RDA's re-transmission pattern would form multiple main beams whose magnitudes are proportionate to the strengths of the corresponding interrogating signals (pilot tones) incident upon it [9][10][11]. This leads to reduced gain of the wanted transmission link, and, information leakage into unwanted spatial directions.…”

Section: Introductionmentioning

confidence: 99%

Spectral signature secured retrodirective array

Fusco

Ding

Buchanan

2016

IET Microwaves, Antennas & Propagation

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A novel retrodirective array (RDA) architecture is proposed which utilises a special case spectral signature embedded within the data payload as pilot signals. With the help of a pair of phase-locked-loop (PLL) based phase conjugators (PCs) the RDA's response to other unwanted and/or unfriendly interrogating signals can be disabled, leading to enhanced secrecy performance directly in the wireless physical layer. The effectiveness of the proposed RDA system is experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Spectral signature secured retrodirective array

Fusco

Ding

Buchanan

2016

IET Microwaves, Antennas & Propagation

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“…When multiple devices interrogate a classical RDA using identical frequency pilot tones, the RDA re-transmitted far-field patterns will form multiple main beams in free space whose magnitudes are proportionate to the strengths of the incoming pilot signals [41], [42]. Firstly in this section the scenario of two legitimate receivers located along directions α and β (α ≠ β), respectively, in free space is taken as an example.…”

Section: Validation With Multiple Legitimate Receivers In Free Spacementioning

confidence: 99%

A Synthesis-Free Directional Modulation Transmitter Using Retrodirective Array

Ding

Fusco

2017

IEEE J. Sel. Top. Signal Process.

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Abstract-By modification of the classical retrodirective arrays (RDAs) architecture a directional modulation (DM) transmitter can be realized without the need for synthesis. Importantly, through analytical analysis and exemplar simulations, it is proved that, besides the conventional DM application scenario, i.e., secure transmission to one legitimate receiver located along one spatial direction in free space, the proposed synthesis-free DM transmitter should also perform well for systems where there are more than one legitimate receivers positioned along different directions in free space, and where one or more legitimate receivers exist in a multipath environment. None of these have ever been achieved before using synthesis-free DM arrangements.Index Terms-Directional modulation (DM), information pattern, interference pattern, retrodirective array (RDA), synthesis-free.

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