OFDMA_Part22 - The graph shown in Figure 9 illustrates the...

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22 water-filling algorithm that depends on the largest power difference. Figure 8 shows an example of a two-user system. In this example, water-filling is done at the noise level that corresponds to the largest power difference. For the example shown in Figure 8, water-filling is done on n 2 e in state 1 because n 2 e (with respect to μ 2 / λ ) has a higher power difference than n 1 e (with respect to 1 / ). Figure 8. Water-Filling For Two Users With Minimum Rate Capacity Region [25] The authors also obtained some numerical results that are illustrated in Figure 9 and Figure 10.
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Unformatted text preview: The graph shown in Figure 9 illustrates the capacity region for a high noise level of 40dB and the graph shown in Figure 10 illustrates the capacity region for a lower noise level of 20dB. The figures show that the capacity of the minimum rate capacity region is smaller if the channel suffers from severe fading. Furthermore, increasing the minimum rate requirement of the users decreases the size of the capacity region....
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