Therefore, when β is higher than a particular threshold, the two-way DF-relayed D2D communication mode achieves higher ergodic achievable sum-rate than that of the direct D2D communication mode.
A transmission mode switching strategy, which select the one with the highest ergodic achievable sum-rate among all transmission modes, is proposed based on the ergodic sum-rate as a function of the interference from cellular users and the distance between D2D users.
Hence, when Pfis small, the CRN gains higher achievable transmission sum rate.
b) For a given power constraint (ATP or IAP), the lowest achievable sum MSE (derived from PMMSE) and highest achievable mutual information (derived from PMMI) for the k th pair are the same for the downlink and uplink frameworks. .
For a given power constraint (ATP or IAP), the lowest achievable sum MSE (derived from PMMSE) and highest achievable mutual information (derived from PMMI) for the k th pair are the same for the downlink and uplink frameworks.
The encoder chooses two indices with the highest (Ileft (W_{N}^{(i)} right)) values: A={3,4}, and the achievable sum is 1.66 [bits], which is a 7.8% enhancement compared to the previous index.
Simulation results show that the target cell's achievable sum rate of the proposed scheme is much higher than the random pilot scheduling (RPS) and the smart pilot assignment (SPA) schemes; also, our scheme can reduce the impact of shadowing fading on the target cell's achievable sum rate effectively.
However, they would achieve somewhat better instantaneous rates when scheduled, leading to an increased (albeit slightly) achievable sum rate.
valve, with the highest achievable effectiveness.
By optimizing transmit powers at the BS and the TS ratio, the system achievable sum rate performance is maximized.
Based on this fading model, the novel analytical expressions for the achievable sum rate (ASR), symbol error ratio (SER), and outage probability (OP) are derived, followed by the asymptotic performance at both high- and low- signal-to-noise ratio (SNR) regimes.
