Effects of relay and side information at one encoder on the coverage regions in Gaussian multiple‐access channel

Abstract

The two-user multiple-access relay channel (MARC) is investigated in the presence of side information (SI) available only at the informed transmitter in the present article. First, for the discrete alphabet and memoryless MARC with common and private messages, partial decode and forward strategy at the relay and fixed locations of the nodes, a general achievable rate region is obtained. The SI effect is seen and can be analyzed. Second, we extend the discrete result to a practical communications model: Gaussian multiple-access relay channel (GMARC), showing previous works as its special cases. Third, the effect of (perfect and nonperfect) SI on the maximum coverage region of GMARC for a fixed rate of the transmitters and a fixed distance between relay and destination is analyzed. It is shown that the SI increases the coverage region of encoders, and consequently, it can improve communication energy efficiency. Finally, mathematical findings are validated numerically by using Matlab.

Copula based analysis of impact of wireless channels correlation on the physical layer security performances in a wireless wiretap channel with artificial noise

“…Remark. The above relation (16) shows explicitly by 𝜃 1 the correlation impact on the transmission probability in (15). In other words, ( 16) is reduced to (15) by 𝜃 1 =0.…”

“…The ASR against the P A based on the variations of dependence parameter 𝜃 with 𝜂 = 0.4 F I G U R E 6 GSOP vs P J , for different values of 𝜂 with 𝜀 = 0.2 and 𝜇 = 0.5 against transmission power for different dependence parameter in Figure 7. The required value of transmission probability can be used to determine 𝜂 and corresponding GSOP, as mentioned in (16). Also, it can be observed that GSOP performance can be improved significantly by allocating more power to the artificial noise at the cost of transmission probability.…”

“…The authors in Reference 5 generalized the results of Reference 3 to the Gaussian version. In recent years, some other researchers have been analyzed the importance of secrecy efficiency measures over several fading channels, such as References 6‐18 and so forth.…”

Communication Performance Analysis of Wireless Multiple Access Channel with Specially Correlated Sources

“…In [22], the effect of (perfect and nonperfect) SI on the maximum coverage region of GMARC for a fixed rate of the transmitters and a fixed distance between relay and destination is analyzed, using the innovative Copula theory approach. Additionally, Reference [23] presents closed-form expressions derived by the authors for average secrecy capacity (ASC), secrecy outage probability (SOP), and secrecy coverage region (SCR).…”