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9.7
9.7
The relationship between the contributors of the interference in a OFDMA network is illustrated in Figure 205.

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F205
F205
Figure 205: Illustration of the interference mechanism in the OFDMA module


Figure 207 205 illustrates the interference mechanism in the OFDMA module where the inter-system or also called self interference is noted “Iinter” and the interference from an “external” interference system is referred to as “Iext”. In the SEAMCAT OFDMA implementation, the term “BS” and “cell” have the same meaning.

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Mathinline
body${{I}_{\text{ext}}}(j,k)=\sum\limits_{m=1}^{N}{iRS{{S}_{unwanted}}(IL{{T}_{m}},U{{E}_{j,k}})\times iRS{{S}_{blocking}}}(IL{{T}_{m}},U{{E}_{j,k}})$
      (Eq. 50)

Iext(j,k) is the interference to the the victim UEj,k from N interfering link transmitters (ILT). Note that the ACIR (Adjacent Channel Interference Ratio) is implicitly taken into account when both unwanted and blocking mechanism are summed in the computation. The unwanted and blocking are defined as follow

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for each of the victim UEj,k’s frequency where the DL information is received. The ILT can be any generic systems or a BS/UEs of a cellular system.

                       (Eq. 52)

at the victim system frequency. Where NRB is the number of RBs (i.e. subcarriers) requested per UE, and M is the maximum number of RBs per BS.


              Image Modified               (Eq. 53)


where NoiseFigureUE is the noise figure of a UE.