چكيده به لاتين
The new generation of wireless networks must provide users with a wide variety of services, including high-speed Internet access, high quality video calls and more. These new increasing services require very high shipping rates. The need for high transmission rates and the large number of users of wireless networks have made this service very energy intensive. High energy production causes a significant increase in greenhouse gas emissions.
In 5G networks, one type of MIMO is proposed, which employs a large number of antennas at the base station called MIMO. With this technology, the base station can communicate with multiple users at the same frequency band, thereby providing high multiplicity as well as array gain at the same time. Although relays were initially known to increase the level of data transmission, they later realized that the relay could be used in a wireless communication system to not only increase the level of coverage, but also increase network efficiency and system capacity. Increase as well as reduce transmission power.
In this thesis, the channel information is incomplete. Amplify and Forward and Decode and Forward are utilized by MRT / MRC processing in relays. Then three power scalability schemes are discussed. Power scalability is useful for saving power consumption, the most important advantage being the use of very large antennas. In the following, energy efficiency based on the power of each user and relay in antenna mass relay system was investigated. There is a uniform relationship between energy efficiency and spectral efficiency. For example, at spectral efficiency of 35 [bits / s / Hz], the energy efficiency at the same power allocation is about 0.9 [bits / J] while the optimal power allocation is about 4.8 [bits / J]. It is observed that by increasing the spectral efficiency, the energy efficiency decreases, for example at 60 [bits / s / Hz] spectral efficiency, energy efficiency at the same power allocation of about 0.3 [bits / J] while optimum power allocation of about 0.7 [bits / J]. It was also investigated the pilot power and data power allocation, which combined the optimal power allocation mode of the user and the pilot with the two other modes, namely identical power allocation, optimal power allocation. In addition, the optimal user allocation performs better than the same power allocation.
