frequency hopped spread spectrum

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madesh
madesh 2011-9-4
回答： Bablu Singh 2019-2-24
A frequency-hopped spread spectrum transmitter is using four-level frequency shift keying (4-FSK) to transmit at a rate of 200 kbps. Let Δf = 10 MHz, and let fc - 3Δf, fc - Δf, fc + Δf, and fc + 3Δf be used to transmit the binary pairs 00, 01, 11, 10, respectively. Eight different possible carrier frequencies have been selected: 270 MHz, 350 MHz, 430 MHz, 510 MHz, 590 MHz, 670 MHz, 750 MHz, and 830 MHz. Refer to these eight frequencies as f1, f2, f3, f4, f5, f6, f7, and f8. The data to be transmitted is “1001001110”, and the pseudo-random code has generated the random hopping sequence f2, f6, f7, f1, f3, f8, f4, f5, f7, f3, f1, f4, .... How to plot the transmitted frequency versus time if hopping occurs once every twenty microseconds?

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回答（2 个）

Walter Roberson
Walter Roberson 2011-9-4
With a 'stairs' plot, perhaps?
Bablu Singh
Bablu Singh 2019-2-24
you just need to plot the graph between frequency and time (with difference of 20ms) . it will help to plot your graph..

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