Abstract
Precoding is a beamforming technique that supports multi-stream transmission in which the RF chain plays a significant role as a digital precoding at the receiver for wireless communication. The traditional precoding contains only digital signal processing and each antenna connects to each RF chain, which provides high transmission efficiency but high cost and hardware complexity. Hybrid precoding is one of the most popular massive multiple input multiple output (MIMO) techniques that can save costs and avoid using complex hardware. At present, network services are currently in focus with a wide range of traffic volumes. In terms of the Quality of Service (QoS), it is critical that service providers pay a lot of attention to this parameter and its relationship to Quality of Experience (QoE) which is the measurement of the overall level of user satisfaction. Therefore, this paper proposes hybrid precoding of a partially structured system to improve transmission efficiency and allocate resources to provide network services to users for increasing the user satisfaction under power constraints that optimize the quality of baseband precoding and radio frequency (RF) precoding by minimizing alternating algorithms. We focus on the web browsing, video, and Voice over IP (VOIP) services. Also, a Mean Opinion Score (MOS) is employed to measure the level of user satisfaction. The results show that the partially structured system provides a good user satisfaction with the network's services. The partially structured system provides high energy efficiency up to 85%. Considering web service, the partially structured system for 10 users provides MOS at 3.21 which is higher than 1.75 of fully structured system.
Highlights
multiple input multiple output (MIMO) is a communications technology that has been used since 4G
In terms of energy efficiency compared to the number of radio frequency (RF) chains, the spectral efficiency is compared with Signal to Noise Ratio (SNR)
The energy efficiency of fully and partially structured systems decreases with an increase in the number of RF chains in which the partially structured system provides a higher percentage up to 85% compared to fully structured system with an average number of 16 RF chains
Summary
MIMO is a communications technology that has been used since 4G. The basic principle of MIMO is the use of more than one antenna to transmit and receive data. CMC, 2022, vol., no.1 using more than 100 antennas to transmit and receive data, so called massive MIMO system and multi-directional beamforming It can alter the magnitude and phase for signal control, allowing the antenna to focus on each user. For Orthogonal Frequency-Division Multiplexing (OFDM) technique in massive MIMO wireless communications, each subcarrier is modulated at a low symbol rate reducing multipath fading, high Signal to Noise Ratio (SNR). This can eliminate Inter Symbol Interference (ISI) [4,5,6]
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