Title :
A hardware phase continuous frequency synthesiser for frequency hopping spread spectrum
Author :
Cercas, Francisco A B ; Tomlinson, Martin ; Pereira, Jorge M N ; Albuquerque, Augusto A.
Author_Institution :
IST, DEEC, Lisbon, Portugal
Abstract :
One of the major problems when implementing frequency-hopping spread-spectrum systems is to obtain an accurate, fast, and transient free frequency synthesizer. Direct digital synthesis meets these requirements with economy and simplicity. A brief analysis of a direct digital frequency synthesizer is made, indicating the several sources of noise that contribute to signal degradation, the frequency distribution of spurious response due to phase and amplitude quantization, and expressions for the signal-to-noise ratio. A hardware prototype was built (using emitter-coupled logic), and its performance is shown to be in good agreement with both theoretical and simulation results based on the computation of a fast Fourier transform
Keywords :
digital integrated circuits; emitter-coupled logic; frequency agility; frequency synthesizers; spread spectrum communication; SNR; amplitude quantization; direct digital frequency synthesizer; direct digital synthesis; emitter-coupled logic; fast Fourier transform; frequency distribution; frequency hopping spread spectrum; hardware prototype; phase continuous frequency synthesiser; phase quantisation; signal degradation; signal-to-noise ratio; simulation results; spurious response; Degradation; Frequency synthesizers; Hardware; Noise level; Phase noise; Quantization; Signal analysis; Signal synthesis; Signal to noise ratio; Spread spectrum communication;
Conference_Titel :
Electrotechnical Conference, 1989. Proceedings. 'Integrating Research, Industry and Education in Energy and Communication Engineering', MELECON '89., Mediterranean
Conference_Location :
Lisbon
DOI :
10.1109/MELCON.1989.50066
