A7.3 ILT EMISSIONS MASK

Figure 375 shows the principle of the determination of the interfering power. If  f_ILT =f_ VLR then the interfering frequencies fall exactly in the receiving band of the victim link receiver (co-channel interference).

For simplification within the algorithms the mask function p_m_ILT is normalized to 1 Hz reference bandwidth:

                                      (Eq. 110)

The bandwidth b is the bandwidth used for the emission mask. The total received interfering power emission_ILT can easily be calculated by integration over the receiver bandwidth from  to

                               (Eq. 111)

with p_n_ILT denoting the normalized mask in dBm/Hz. Using 1 Hz reference bandwidth the integral can be replaced by a summation

                                   (Eq. 112)

where power_ILT is given in dBm.

Note:  The interfering power of a radio system having a different bandwidth can be estimated by the aforementioned algorithms. This calculation is only required for the interference due to unwanted emissions but not for blocking and intermodulation.

Figure 375: Integration of the unwanted emissions in the victim link receiver band

The total interfering power relative to carrier  

                        (Eq. 113)

with  denoting the normalized user-defined mask in dBc/Hz.

This mask is expressed as an array of N+1 points  and assumed linear between these points.

                                                (Eq. 114)

This leads to:

                                 (Eq. 115)

where:

                                                                         (Eq. 116)

                                                                                    (Eq. 117)

Intermediate calculation

    (Eq. 118)

                               (Eq. 119)

Eventually:

                    (Eq. 120)