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The total interference at the primary BS must not exceed the interference threshold (Ith).
Secondary users can exceed the interference level with a predefined small probability level.
Secondary users can exceed the interference level with a predefined small probability level to share the spectrum.
Moreover, to guarantee that the total interference power caused by multiple SUs do not exceed the interference threshold through completely distributed manner is difficult to implement.
In some practical scenarios, the primary links may allow secondary users exceed the interference constraint with a certain probability α instead of staying strictly below it.
Specifically, with non-robust design, around 52%,55%, 57%, 59%and61%1% of the simulated channel errors exceed the interference threshold of the primary network (Ith = 1) for uncertainty ball radius of 0.1,0.2,0.3,0.4 and 0.5, respectively.
Similar(54)
The probability of exceeding the interference power constraint is next investigated for the two resource allocation algorithms.
Further reduction in the probability of exceeding the interference power limit using the RA scheme is possible, at the expense of a degradation in performance.
In contrast, the proposed resource allocation scheme never exceeds the interference power limit, while maximising the sum rate over all users and achieving fairness among multiple transmission.
However, it is possible to reduce the probability of exceeding the interference limit to a given limit, say 10% of time.
Thus, in average, our robust design provides a similar SINR performance for the secondary network as the non-robust design without exceeding the interference threshold of the primary network.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com