h = 1-a log2(1 = + Ae2e) bits/sec/Hz, the closed-form upper-bound expression for the outage probability is given as [13] (6.15) The closed-form expressions of F (Ath) and (Ath) are given in (6.29) which are derived by following the procedure as in [32]. In (6.29), A1 = A = ++n+ MRD, V = z - q + 1, MSD = MSDND, MSR = MSRNR, and MRD = MRDND. Further, ASD=AsD, mSD' ASR, and = is the multinomial theorem coefficient [15]. Ns m(MsD-1) -MSSDAth NS p(MSR-1)(NR-1)t(MRD-1)A-1 (6.16) 6.3.2.2 Asymptotic Analysis Asymptotic analysis provides the system deep insights which are useful in modeling the system. It provides information regarding system parameters such as diversity and coding gain which are vital in evaluating the performance of the system. By taking the high SNR approximation of ex and Kv (z) [35, eq. (1.211.1), Eq. (8.446)], the closed-form asymptotic outage probability expression is derived at A as [13] 6 Energy Harvested Device-to-Device MIMO Systems for Beyond 5G. (6.17) (6.18) For i = ,PQ= SD, for i=2, PQ=SR, and for i = 3, PQ = RD. Further, O1 = MSDNS + MSRNs, O2 = MSDNS + MRDNR, O3 = MSDNS + MNR, M = msrNs = MRDND, and kpq = APO 6.3.2.3 Throughput Analysis For a fixed transmission rate, throughput is evaluated in delay-limited transmission mode from the outage probability as [11] (6.19) where Ath=21-a - 1 is the threshold SNR for a fixed rate Rth. 6.3.3 Results and Discussion In this section, modeled system performance is validated and discussed through the derived analytical expressions of outage probability and asymptotic outage probability and the Monte Carlo simulations. In the system performance analysis, the parameters are considered as follows: channel correlation coefficients are taken as {PSD, PSR, PRD}, and CSI parameters are considered as p = 0.99 for perfect case and p = {0.95, 0.9} for imperfect cases. Further, EH efficiency factor (n = 1) and different values of a are considered. In Fig. 6.3, outage probability results are presented for the 2x2x2 AC with FP {1, 1, 1} with a = 0.2. In this analy