## 2 Proposal of the New Protection Definition
### Main Results Achieved  
The results obtained from the laboratory tests were condensed into several curves, which are presented and described below. Figure 3 depicts curves that relate the DTV signal power to the average PR obtained for the demodulation and decoding of the video signal without visually perceptible issues. Therefore, the PR value presented is the limit value for harmonious coexistence, according to the aforementioned criterion. Each curve on the graph represents the mean PR value, named as the PR\({}_{\text{avg}}\) value, obtained for the three evaluated receivers. Each curves is related to the influence of one interfering signal at a time, generated by one of the three different systems described: 4G, 5G, or 5G-RANGE in GFDM. Figure 3a illustrates the DTV signal power versus PR\({}_{\text{avg}}\) curve for a non-simultaneous interfering signal applied to the immediately lower or upper adjacent channels, i.e., interference on channel \(n-1\) or \(n+1\). It can be observed that for the DTV signal with a power lower than \(-30\) dBm, the average PR value for different technologies, considering the incidence of interference in one of the adjacent channels, is around \(-30\) dB. In other words, the DTV signal can be correctly demodulated even in the presence of an interfering signal in an adjacent channel with a power around 30 dB higher than the DTV signal. However, for DTV power levels higher than \(-30\) dBm, the PR value must be higher than the mentioned value, implying a lower power of the interfering signal. The highest PR\({}_{\text{avg}}\) value identified was approximately \(-25.85\) dB for the DTV power of \(-20\) dBm when the interfering signal was the 5G NR signal on channel \(n+1\). Additionally, it is observed that the lowest PR\({}_{\text{avg}}\) values for interference on channels \(n-1\) and \(n+1\) are achieved with 5G-RANGE in GFDM as the interferer, highlighting its low OOBE. Since the received power of the DTV signal in real conditions is typically reduced due to the distance between the receivers and transmission stations, it is worth noting the PR\({}_{\text{avg}}\) values obtained for the DTV signal power of \(-77\) dBm, which is the recommended sensitivity threshold for DTV receivers [47]. The lowest PR\({}_{\text{avg}}\) values for interference on channels \(n-1\) and \(n+1\) are \(-31.38\) dB and \(-33.24\) dB, respectively, both achieved with  
Figure 3: DTV power versus limit values of PR for interference signals generated by different technologies applied on channels: (**a**) \(n+1\) or \(n-1\). (**b**) \(n+2\) or \(n-2\). 5G-RANGE in GFDM as the interfering signal. On the other hand, the highest PRavg values were measured for the 4G/LTE and 5G NR technologies, which were \(-30.31\) dB for channel interference \(n-1\) and \(-27.07\) dB for channel interference \(n+1\). Figure 2(b) shows the DTV signal power versus PRavg curve for a non-simultaneous interfering signal applied to the second lower or upper adjacent channel, i.e., interference on channel \(n-2\) or \(n+2\). It can be observed that for the DTV signal with a power lower than \(-50\) dBm, the average PR value for different technologies, considering the incidence of an interfering signal, is around \(-52.5\) dB. In other words, the DTV signal can be correctly demodulated even in the presence of an interfering signal in the second adjacent channel with a power level around \(52.5\) dB higher than the DTV signal. However, the PR value must be higher than the mentioned value for DTV power levels higher than \(-50\) dBm. The highest PR average identified was approximately \(-28.4\) dB, for the DTV power of \(-20\) dBm when the 5G NR and 4G/LTE signals were the interfering signals in the channel \(n+2\).