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Performance of Non-Polarized Noise Modulated Communications System in the Presence of Interference

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Abstract

The noise modulated non-polarized communication system, developed by us recently, is an ultra-wideband transmitted-reference system designed for secure interferencefree communications. By using ultra-wideband random noise to spread the signal and by using polarization diversity for transmitting the spread message and the reference signal, we make the transmitted signal appear totally featureless and noise-like. However, the system may encounter intentional and non-intentional interference since its operating bandwidth is very large. This paper derives analytical models to characterize system performance in partial-band jamming channels and channels containing narrowband interference. Models compare very well with simulations and results validate successful system operation under low signal-to-interference ratio conditions. Research also reveals that the center frequency of transmitted signal must be suitably protected to prevent link outage due to the presence of cross-interference terms. Since multipath acts as self-interference for communication systems, a new method which can improve system performance in multipath environments is also introduced in this paper.

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Abbreviations

BER:

Bit error rate

BPSK:

Binary phase shift keying

CDF:

Cumulative distribution function

DS/SS:

Direct-sequence spread-spectrum systems

FPGA:

Field-programmable gate array

FSK:

Frequency shift keying

GPS:

Global positioning system

ISI:

Intersymbol interference

LPD:

Low probability of detection

LPI:

Low probability of intercept

NBI:

Narrowband interference

PDF:

Probability density function

QPSK:

Quadrature phase shift keying

SIR:

Signal-to-interference ratio

SNR:

Signal-to-noise ratio

PN:

Pseudo-noise

PSD:

Power spectral density

TR:

Transmitted-reference

RF:

Radio frequency

SSB:

Single sideband

UWB:

Ultrawideband

WSSUS:

Wide sense stationary uncorrelated scattering

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Authors and Affiliations

  1. The Pennsylvania State University, University Park, PA, USA

    Jack Chuang & Ram M. Narayanan

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  1. Jack Chuang
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  2. Ram M. Narayanan
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Correspondence to Ram M. Narayanan.

Additional information

This work was supported by the US Office of Naval Research (ONR) Grant # N00014-04-1-0640.

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Chuang, J., Narayanan, R.M. Performance of Non-Polarized Noise Modulated Communications System in the Presence of Interference. Wireless Pers Commun 65, 773–796 (2012). https://doi.org/10.1007/s11277-011-0295-6

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