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
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