Question 2.17: Which system requires the highest Eb/N0 ratio for a probabil......

Advanced Electronic Communications Systems [1093752]

Which system requires the highest $E_{b}/N_{0}$ ratio for a probability of error of $10^{-6}$ , a four-level QAM system or an 8-PSK system?

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From Figure 49, the minimum $E_{b}/N_{0}$ ratio required for a four-level QAM system is 10.6 dB. From Figure 48, the minimum $E_{b}/N_{0}$ ratio required for an 8-PSK system is 14 dB. Therefore, to achieve a P(e) of $10^{-6}$ , a four-level QAM system would require 3.4 dB less $E_{b}/N_{0}$ ratio.

ch2_figure_49

ch2_figure_48

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