In Fig. 3, an example of the R–E region is shown for a two-user MIMO system. It is assumed that KD 5170 M=NEH=NID=2. The transmit power is assumed to be P=1P=1 W or 30 dBm. The distances from the transmitter to the EH and ID receivers are assumed to be 1 m and 10 m, respectively. Assuming the pathloss exponent to be 4, the signal attenuation can be calculated by 40 dB for 1 m and 80 dB for 10 m. Therefore, the average signal power at the EH and ID receivers are −−10 dBm and −−50 dBm, respectively. Furthermore, the bandwidth is vascular system assumed to be 10 MHz, while the receiver thermal noise is assumed to be −−140 dBm/Hz. As a result, considering all the aforementioned factors, the average SNR at the ID receiver is equal to 20 dB or 100 W with a unit-norm noise, and the average signal power at the EH receiver is 50 μW. The utility function parameters of each receiver are given in Table 1 and the utility functions of each user are shown in Fig. 4.
↧