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In the overlay spectrum access, the SU is only allowed to access frequency bands if the secondary network (SN) uses interference cancelation techniques to mitigate interference to the primary network (PN) [2].
One of time-domain strategies is the so-called almost blanking subframes (ABS) introduced in 3GPP Release 10, where macro BSs are periodically muted in order to mitigate interference to offloaded users [7 10].
For these scenarios, Claussen et al. propose in[24] a self-tuning algorithm to adjust transmit power for uplink and downlink in an Universal mobile telecommunication system (UMTS) femtocell to mitigate interference to macrocells and ensure a constant femtocell radius, regardless of the position of the latter within the macrocell area.
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The highest throughput is achieved by the cap-limited scheme, since it only mitigates interference to the closest PU band.
Though much cannot be concluded from Figure 9, the SU throughput for various algorithms, averaged over 100 independent realizations of the channel (Figure 11), reveals more about their performance: the highest throughput is achieved by the cap-limited scheme proposed in literature [10], since it only mitigates interference to the closest PU band.
In order to mitigate interference at receivers, the dirty paper coding (DPC) schemes for various relaying schemes have become very important.
Simulation results are used to show the ability of the PMW and PFD to mitigate interference and make comparisons to traditional filtering techniques and ECC.
Since the spectrum is a scarce and expensive resource in wireless systems, it would be desirable to design systems operating in universal frequency reuse (i.e., with frequency reuse factor 1). Multicell cooperation is a promising solution to mitigate interference between different cells, to improve the system's fairness and to increase capacity [3-7].
The PU band is divided into 8 sub-bands, and we attempt to mitigate the interference to each of them.
However, how to mitigate the interference to the existing systems and increase the spectrum utilization for UWB radar sensor networks should also be studied carefully.
The PU spectral band is divided into sub-bands, and the proposed algorithms effectively mitigate the interference to each of them.
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