Scientific paper ID 1916 : 2020/2

Georgi Dimitrov

The Massive multiple-input, multiple output technology will be one of the most promising technologies for the future mobile network generations. It will bring the potential to provide improvement in spectral efficiency as well as energy efficiency. Modern technologies changed dramatically the ways of communication. Time when the telephones, the computers and the internet connections should have been via cable and used from determined locations, is long gone. All communication services nowadays are wireless from almost everywhere on Earth, thanks to the rapid development of cellular networks – GSM, UMTS, LTE. Future research should focus on network coverage, which will remain the area of greatest challenge in the future, as network coverage ensures service mobility while ensuring the same quality in each cell. The published material addresses the option to increase the frequency bandwidth, which is the parameter for measuring the performance of current and future wireless networks. User density and the utilization of additional bandwidth leads to reduced mobility. If the frequency spectrum is over-utilized, improvements in the spectral efficiency of the network can result. Thus, in fact, new ways of modulation and multiple access techniques should be developed. Radio transmission in cellular networks is generally affected by the interference associated with simultaneous transmissions in the same or from other cells. When the interfering signal is strong enough, then potentially it can be decoded and thus the interference from the received signal eliminated, before obtaining the desired information. This is conceptually simple but difficult to implement in practice in wireless networks, where interference signals change over time and cells are not fully cooperating.

Повсеместна свързаност MIMO GSM CDMA Wi-Fi LTE 5G 802.11 подобряване на спектрална ефективност пропускателна способност Massive interconnections MIMO GSM CDMA Wi-Fi LTE 5G 802.11 spectral efficiency throughput coverage layer access poinGeorgi Dimitrov


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