Design And Development Of A Secure Wireless System Using Frequency Hopping Spread Spectrum
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Date
2007-03
Authors
Yahya, Abid
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Abstract
In this research, an automated wireless system that sends the data
accompanied with PN code automatically to the concerned authorities has been
developed. The processing gain achieved by the system is 18dB at a hopping
rate 333.33 hops/sec which is 3dB more than the standard processing gain
(15dB) mentioned by the Federal Commissions for Communication (FCC). This
work has employed frequency hopping spread spectrum (FHSS), where the
transmitting radio transmits a data packet on one frequency and rapidly hops to
another possible frequencies to transmit the next packet. The system is cost
effective, is small and easy to transport, is sensitive to very weak signals,
requires minimal data storage requirement and easy to use and operate. The
results have indicated that worst case jamming (Pwc) decreases as Et/NJ gets
larger. It may be noted from the results that for this type of noise power
estimation error, increasing the order of diversity rapidly reduces the
effectiveness of partial-band noise jamming. The availability and use of side
information improves the system performance in all cases. Because of
pseudonoise code, data is saved from external interference and can be
successfully received. This research has provided an analytical framework for
evaluating the performance of FHSS operating in the presence of partial band
noise jamming with M-ary FSK modulation and noncoherent demodulation.
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Design And Development Of A Secure Wireless , Using Frequency Hopping Spread Spectrum