Performance enhancement of maximum ratio transmission in 5G system with multi-user multiple-input multiple-output

Abstract

<span>The downlink multi-user precoding of the multiple-input multiple-output (MIMO) method includes optimal channel state information at the base station and a variety of linear precoding (LP) schemes. Maximum ratio transmission (MRT) is among the common precoding schemes but does not provide good performance with massive MIMO, such as high bit error rate (BER) and low throughput. The orthogonal frequency division multiplexing (OFDM) and precoding schemes used in 5G have a flaw in high-speed environments. Given that the Doppler effect induces frequency changes, orthogonality between OFDM subcarriers is disrupted and their throughput output is decreased and BER is decreased. This study focuses on solving this problem by improving the performance of a 5G system with MRT, specifically by using a new design that includes weighted overlap and add (WOLA) with MRT. The current research also compares the standard system MRT with OFDM with the proposed design (WOLA-MRT) to find the best performance on throughput and BER. Improved system results show outstanding performance enhancement over a standard system, and numerous improvements with massive MIMO, such as best BER and throughput. Its approximately 60% more throughput than the traditional systems. Lastly, the proposed system improves BER by approximately 2% compared with the traditional system.</span>

Performance evaluation of precoding system for massive multiple-input multiple-output

“…Figure 1. The MU-MIMO model [25] Assumedly, BS has access to the most up-to-date channel status information. Before employing the transmitter symbol, big MIMO systems like frequency division duplexing (FDD) acquire time division mode (TDD) pilots [26], [27].…”

Studying the effect of changing Input conditions on MMF using MGDM technique

“…Among these technologies, the mode group diversity multiplexing (MGDM) represents a method for integrating various services across the multi-mode fiber (MMF), by inducing different sets of modes, which can be used as independent and parallel communication channels [4]- [7]. Wireless multi-input multi-output (MIMO) systems became that the transmitter diversity and receiver diversity widely used to counter multipath fading [8], [9]. It is possible to reduce the probability of error and ensure a reliable connection.…”