Securing UWB Communications under NLOS Indoor Propagation Conditions

LeBel, J.; Cule, D.

doi:10.1109/vetecf.2010.5594330

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…In spite of adverse propagation conditions high-quality UWB mm-wave data transmission can nevertheless be achieved at medium distances under NLOS propagation conditions although the post-DFT antenna selection per subcarrier based on the amplitude metric proved to be not as effective as it was at shorter distances [2]. Still, at medium distances, high-quality data transmission rates comparable to those achievable under good LOS conditions may be achieved with post-DFT antenna selection per subcarrier when a suitable passive reflector/repeater is selected.…”

Section: Discussionmentioning

confidence: 99%

“…The measurement apparatus, excluding antennas, is similar to that used for shorter-range NLOS propagation studies [2] but the frequency of operation was centered around 60.1 GHz rather than 29.5 GHz. Signal measurements were made every 100 kHz over a bandwidth of 1 GHz.…”

Section: Field Measurementsmentioning

confidence: 99%

“…Studies based on measurements and simulations [1] have revealed that high data throughputs may be achieved by the use of specially shaped reflecting/scattering devices for NLOS broadband data transmission. Data transmission rates of 1 gigabit per second and higher in the millimeter-wave range may be achieved when using reflectors/scatters [2] as a means of obtaining signal propagation in spite of the fact that NLOS transmission almost invariably results in adverse propagation conditions. Microwave propagation by reflections/scatter presents the advantage of increased coverage for UWB microwave communications.…”

Section: Introductionmentioning

confidence: 99%

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Extending 60 GHz UWB coverage to medium distances under NLOS conditions

Talbi

LeBel

2012

2012 International Conference on Wireless Communications in Underground and Confined Areas

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Ultra-wideband (UWB) communications can be achieved under non-line-of-sight (NLOS) propagation conditions at distances over 100 m using a single carefully designed and located microwave reflector in conjunction with a multi-carrier modulation technique such as orthogonal frequency-division multiplexing (OFDM) that is less sensitive to multipath effects than single-carrier modulation. One key factor in achieving high data throughputs is the average intensity levels of the reflected signals that are produced by using high-gain antennas and reflectors. A second key factor is the proper design of a reflector to minimize delays spreads and provide adequate signal strengths. A third key factor is the application of a suitable technique to recover defective OFDM subcarriers. In order to firmly ground performance predictions on experimental measurements, precise frequency response measurements of reflected signals were carried out in a 1 GHz band centered around 60.1 GHz. Measurements of the frequency response of NLOS indoor propagation channels were performed for three different laterally-positioned receive antenna locations and used for single-input multiple-output (SIMO) studies. Based on these measurements, OFDM data transmission streams were simulated. It was determined that individual subchannels of the OFDM data transmission stream suffered from various levels of distortion resulting in the lack of availability of some OFDM subchannels for UWB data transmission. Using the technique of post-discrete Fourier transform (post-DFT) multiple subcarrier selection (MSCS), it was found that data throughputs comparable to those achievable under quasi-perfect propagation conditions could be obtained in NLOS indoor channels provided that the delay spread was short (18.1 ns). The signal-amplitude metric was used for the selection of OFDM subcarriers.

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Section: Discussionmentioning

confidence: 99%

Section: Field Measurementsmentioning

confidence: 99%