S.N. Zamuruev1, A.A. Sudakov2

1,2 MIREA – Russian University of Technology (Moscow, Russia)
 

Nowadays ultra-wide band (UWB) signals are applied in different radio systems. These are short range systems for radiolocation, communication and positioning purposes which operate at distances several dozen meters - several kilometers.

Modern radio systems review shows that most systems use pulsed UWB signals with smooth spectrum envelope. But these signals’ energy does not have maximal concentration in occupied bandwidth.

Method for signal energy efficiency estimation has been proposed early. The method allows choosing signal for application in pulsed UWB systems. Accordance to the method bandwidth of signal with smooth spectrum shape can be chosen for transfer maximal energy in occupied bandwidth and minimize spurious emission outside of occupied bandwidth.

Research show that energy efficiency of well known signals no more than minus 1.84 dB. Energy efficiency of the new signals with spectrum shape described as (where n=1,2,…,m) is more than 0.39 dB and its increased with increasing degree of radical n.

Proposed signals are satisfied to the Nyquist’ inter-symbol interference criterion. These signals are base for making orthogonal signal sequences.

Sequence of signals with time and smoothed spectrum shape accordance to cosines law (and smoothing coefficient equal 1) requires in 2.1 times less accuracy of synchronization during recovery process compare with signals which are used in orthogonal frequency-division multiplexing (OFDM) systems. Inter symbol interference for mentioned above proposed signal and same accuracy of synchronization will be in 2.1 times less compare with OFDM signals.

New signals can be generated by using patented digital-to-analog conversion method or by direct digital synthesis method.

Zamuruev S.N., Sudakov A.A. New signal for ultra-wide band systems. Science Intensive Technologies. 2022. V. 23. № 8. P. 25−32. DOI: https://doi.org/10.18127/j19998465-202208-03 (in Russian)

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