Physical layer built-in security analysis and enhancement algorithms for CDMA systems
EURASIP Journal on Wireless Communications and Networking
Advanced frequency hopping modulation for spread spectrum WLAN
IEEE Journal on Selected Areas in Communications
Spectrally Efficient Frequency Hopping System Design under Hostile Jamming
WASA '09 Proceedings of the 4th International Conference on Wireless Algorithms, Systems, and Applications
Jamming mitigation techniques based on message-driven frequency hopping
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
OFDM capacity enhancement by selective channel use
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
A spectrally efficient anti-jamming technique based on message driven frequency hopping
WASA'10 Proceedings of the 5th international conference on Wireless algorithms, systems, and applications
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This paper considers spectrally efficient frequency hopping (FH) system design. Relying on time-frequency diversity over large spectrum, FH systems are robust against hostile jamming interference. However, the spectral efficiency of existing FH systems is very low due to inappropriate use of the total available bandwidth. To improve the system capacity, in this paper, we propose an innovative message-driven frequency hopping (MDFH) scheme. Unlike in traditional FH where the hopping pattern of each user is determined by a pre-selected pseudo-random (PN) sequence, in MDFH, part of the message stream will be acting as the PN sequence, and transmitted through hopping frequency control. As a result, system efficiency is increased significantly since additional information transmission is achieved at no extra cost on either bandwidth or power. We further enhance MDFH by allowing simultaneous transmissions over multiple frequency bands. The enhanced MDFH scheme, named E-MDFH, can achieve high spectral efficiency, and can readily be extended to an FH-based collision-free multiple access scheme. Quantitative performance analysis on the proposed schemes demonstrates that: transmission through hopping frequency control essentially introduces another dimension to the signal space, and the corresponding coding gain can increase the system efficiency by multiple times.