## 5 Simulation Results and Discussions
\begin{table}
\begin{tabular}{c c} \hline
**Parameter** & **Value** \\ \hline Carrier frequency (\(f\)) & 28 GHz [25] \\ Bandwidth (\(B\)) & 500 MHz [25] \\ Antenna gain (\(G_{a}\)) & 15 dBi [18, 26] \\ Noise figure (\(NF\)) & 9 dB [6, 18] \\ Coherence interval length (\(\tau_{c}\)) & 200 samples \\ Length of pilot sequence (\(\tau_{p}\)) & 20 samples \\ Pilot transmit power (\(\rho_{p}\)) & 100 mW \\ Quantization bits (\(\alpha_{m}\)) & 2 bits [36] \\ Fronthaul capacity (\(C_{FH}\)) & 100 Mbps [39] \\ Amplifier efficiency (\(\eta\)) & 0.3 [5] \\ Coherence time (\(T_{c}\)) & 2 ms [36] \\ \(P_{m}^{\text{FH,fix}}=5\) W, \(P_{\text{FH,max}}=50\) W, \(P_{\text{CP}}=1\) W, \\ Power components: & \(P_{\text{RFC}}=40\) mW, \(P_{\text{LNA}}=20\) mW, \\ \(P_{\text{SP}}=19.5\) mW, \(P_{\text{SW}}=5\) mW, \(P_{\text{CPS}}=5\) mW, \(P_{\text{C}}=19.5\) mW, and \(P_{\text{ADC}}=200\) mW. \\ \hline \end{tabular}
\end{table} 
Table 1: Simulation parameters. Figure 3: EE versus number \(N_{r}\) of antennas, where \(M=80\) APs, \(N_{Q}=8\), \(\rho=23\) dBm, and \(K=8\) UEs. Figure 5 shows EE performance against increasing number \(M\) of APs for \(K=8\), \(N_{r}=48\), \(N_{Q}=8\), and \(\rho=23\) dBm. As the number of APs increases, we observe that the EE of all schemes decreases. This is because the power consumption of each AP rises as well, owing to the inclusion of massive hardware components such as RF chains, CPSs, analog-to-digital converters, and so on. This can lead to a decrease in the EE. However, the proposed matching scheme can achieve satisfactory performance concerning the EE over all the schemes mentioned in this paper. However, DSAS lowers EE compared to all other techniques. This is appropriate since the design of \(W_{m}\) for each RF chain excludes a small number of antennas, and these antennas are switched OFF because of their considerable contribution to the interference signals at each AP. Figure 6 presents that total power consumption increases when \(M\) increases. It can be seen that CMFAS with 50% of the selected antennas has the lowest total power consumption. Then, the proposed matching strategy comes after CMFAS with 50% of the selected antennas. This is because the number of selected antennas for each RF chain at each AP plays an important role in minimising total power consumption. Furthermore, it is noted that the number of selected antennas for each RF chain at each AP is no more than 50% in CMFAS, which can lead to lower total power consumption. Therefore, activating a large number of antennas at all the APs causes extremely high power consumption for the uplink cell-free mm-Wave massive MIMO system, as illustrated in the state-of-the-art schemes, motivating the proposed matching scheme in this work to maintain lower power consumption by matching half of the RF chains at each AP to a large number of active antennas to mitigate a significant loss in the SE, while the rest of the RF chains are assigned to fewer selected antennas to maximize the EE. Thus, it can be noted that the proposed matching scheme can overcome DSAS, CMFAS with 75% of the selected antennas, CMDAS, and FCPSs. Figure 7 demonstrates the impact of \(K\) UEs on the EE of the uplink cell-free mm-Wave massive MIMO network when \(M=80\), \(N_{r}=48\), and \(\rho=23\) dBm. It is obvious that the EE increases as \(K\) increases. This is because inter-user interference cannot affect the SE of the uplink systems. In particular, it indicates that large \(K\) UEs in the proposed matching perform better than other schemes in terms of SE. This is because with more data streams received, the chance that the optimal large number of antennas are activated for the half of RF chains at each AP increases. This will enhance the preservation of the system from significant loss in SE. In contrast, the rest of the RF chains are responsible for maintaining EE by choosing a lower number of optimally selected antennas. Compared with the extended schemes and FCPSs, the proposed matching technique provides much-enhanced EE, as anticipated.