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- W2015391745 abstract "AbstractSpread -sprectrum techniques are widely used in state -of- the -art communication systems for suppression of interference. In this paper we will establish the characteristics required for signal -processing devices usedin such systems. Typical spread- spectrum waveforms will be described to emphasize those characteristicswhich lead to good system performance. The synchronization problem will be reviewed to show that this isoften the most difficult aspect of a communication system design and strongly influences the choice of devices.The performance of any device in a system will reflect some features of the device which are undesirable.Spurious responses can cause errors in detection or demodulation circuitry. A limited dynamic range for asignal -processing device might have the effect of lowering the apparent interference rejection of the system.IntroductionMilitary communication systems have long used spread- spectrum techniques for suppression of interference and jamming. Other advantages are the ability to incorporate privacy and authentication measures directlyinto the modulation waveforms, reduced vulnerability to interception or direction finding, multiplex andmultiple access alternatives, and improved multipath- fading performance. In this paper we will review theantijam capabilities of spread- spectrum communication in order to establish desirable properties of devicesto be used for signal processing in such systems.We shall find that devices which process large time -bandwidth -product waveforms are required, and thatthese devices must be programmable in order to allow frequent waveform changes. Consideration of the synchro-nization problem will shown that this is the most critical aspect of systems which handle multiple users andburst traffic, such that long synchronization times are not tolerable. This will demand devices which performas matched filters or multiple parallel correlators. Finally we will consider performance of devices, acritical issue being the effect of dynamic range on processing gain.Spread- spectrum interference rejectionFor binary communication through a channel perturbed by white Gaussian noise,' it is well known thatthe bit -error rate (BER) for a particular modulation technique is a function of Eb /No, the ratio of theenergy in the bit waveform to the noise spectral density. Increasing the signal bandwidth does not improvethe signal -to -noise ratio because the total noise power is proportional to the bandwidth. The situation isquite different when considering interference due to a power -limited jammer. If a noise jammer is forced tospread its available power across a larger bandwidth, its spectral power density must decrease. Thus, the" @default.
- W2015391745 created "2016-06-24" @default.
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- W2015391745 date "1980-02-29" @default.
- W2015391745 modified "2023-10-12" @default.
- W2015391745 title "<title>Device Requirements For Spread-Spectrum Communication</title>" @default.
- W2015391745 doi "https://doi.org/10.1117/12.958292" @default.
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