Broadband MIMO-OFDM Wireless Communications
MIMO-OFDM systems. Section II describes the basic MIMO-OFDM system model. All MIMO-OFDM receivers must perform time synchronization, frequency offset esti-mation, and correction and parameter estimation. This is generally carried out using a preamble consisting of one or more training sequences. Once the acquisition phase is over,
AI-mottagningAn Energy-Efficient Resource Allocation System Using OFDM
Figure 4 shows the fundamental circular layout of downlink multiuser OFDM DAS with n subcarriers, k mobile stations, and m remote access units. All mobile stations and remote access units are equipped with one antenna. The CSI is obtainable at each transmitter and receiver. The remote accessing unit 1 as shown within Fig. 4 is a base station (BS). Every …
AI-mottagningPseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO-OFDM …
This article introduces an energy and spectral efficient multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transmission scheme designed for the future sixth generation (6G) wireless communication networks. The approach involves connecting each receiving radio frequency (RF) chain with multiple antenna elements and …
AI-mottagningNovel Energy Optimized LDPC Codes for Next-Generation MIMO OFDM …
LDPC codes are proposed in this paper for next-generation MIMO OFDM systems. 1.2 PAPER CONTRIBUTIONS Drawing from th e research gaps iden tified in the p receding section, this p aper''s principal ...
AI-mottagningEnergy Efficiency Analysis of Antenna Selection Techniques in Massive ...
In this paper, we propose an M-MIMO-OFDM model using per-subcarrier antenna selection and bulk antenna selection schemes to mitigate these problems. Also, we derive a new uplink and downlink energy efficiency (EE) equation for the M-MIMO-OFDM system by taking into consideration the antenna selection schemes, power scaling factor ( g=0.25, 0.5 ), and a range …
AI-mottagningSecurity and Energy Harvesting for MIMO-OFDM Networks
We consider a multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) network in which a source node, Alice, communicates with an energy-harvesting …
AI-mottagningEnhancing PAPR performance in MIMO-OFDM system using …
Where, received vector of size is Mq ∗ 1; a, transmitted vector of size Mp ∗ 1; B, Channel matrix of size Mq ∗ Mp and m, noise vector. OFDM data is surrounded by M subcarriers, with each image altering the corresponding subcarrier. This means that in a MIMO-OFDM system, the subcarriers are orthogonal throughout the primary data image period0 ≤ p ≤ G and the …
AI-mottagningOverview of OFDMA and MIMO Systems | SpringerLink
Multiple-input multiple-output (MIMO) is a method for multiplying the capacity of a radio link using multiple antennas in the transmitter and/or receiver to exploit multipath …
AI-mottagning5G Massive MIMO-OFDM System Model: Existing Channel
Several numbers of antennas combined with multicarrier modulation schemes give efficacy performance for a 5G wireless communication system. One of the very kinds that is referred in this paper is the MIMO-OFDM model, which uses different kinds of FFT algorithms [].With improved features, the mMIMO-OFDM model has become one of the most capable …
AI-mottagningAn Energy Efficient Based Enhanced Optical OFDM for SISO and MIMO ...
Recent developments in wireless digital communication have made Visible Light Communication (VLC) a promising technology. Comparatively speaking, the VLC system used in this task offers better performance and efficiency. In this study, a modified Optical Orthogonal Frequency Division Multiplexing (indoor VLC communication model) was proposed. To …
AI-mottagningMIMO–OFDM communication systems for traffic data …
In this study, the performance of the MIMO–OFDM communication systems for applying DSC for the communication data transmission and traffic surveillance was appraised. …
AI-mottagningA Survey on MIMO-OFDM Systems: Review of …
Therefore, the current paper gives a detailed overview of the recent advantages of MIMO systems in general and classifies the MIMO-OFDM waveforms, channel estimators, and equalizers. Figure 1 demonstrates the …
AI-mottagningEnergy Efficiency Optimization for MIMO-OFDM Mobile …
Energy Efficiency Optimization for MIMO-OFDM Mobile Multimedia Communication Systems with QoS Constraints December 2014 IEEE Transactions on Vehicular Technology 63(5):2127-2138
AI-mottagningPerformance evaluation of MIMO DFT-Spread WR-OFDM system …
3. Proposed system model. Figure 1 shows the transceiver structure of the proposed MIMO-OFDM system based on DFT-Spreading and time-domain windowing techniques with N r × N t antennas. In the proposed system model, firstly, the synthetically generated binary input data are mapped onto the digital modulators, which especially perform quadrature …
AI-mottagningEnhanced Optical OFDM: A novel approach for SISO and MIMO …
For RF systems, MIMO-OFDM is a common technology to support multi-user services and provide high-speed data transfer (Mirvakili et al. 2015; Yang et al. 2016). The VLC MIMO-OFDM framework requires the picture of the receiver to get modified to separate the signal from the various LEDs, which are not available in several processes.
AI-mottagning1 Energy Efficiency Optimization for MIMO-OFDM Mobile …
nels into flat channels. As a combination of MIMO and OFDM technologies, the MIMO-OFDM technologies are widely used in mobile multimedia communication systems. However, how to improve energy efficiency with quality of service (QoS)constraint is an indispensable problem in MIMO-OFDM mobile multimedia communication systems.
AI-mottagningReliable communication based on energy spreading transform …
multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM), in wireless frequency-selective fading environments persists. In this article, the concept of spread-ing a symbol''s energy is proposed as a viable solution to enhance transmission reliability for MIMO-OFDM systems. And an energy-spreading-transform (EST)-based MIMO-
AI-mottagningSecurity and Energy Harvesting for MIMO-OFDM Networks
for MIMO-OFDM Networks Tiep M. Hoang, Ahmed El Shafie, Daniel B. da Costa, Trung Q. Duong, Hoang Duong Tuan, and Alan Marshall Abstract—We consider a multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) network in which a source node, Alice, communicates with an
AI-mottagningMIMO–OFDM communication systems for traffic data transmission …
1 Introduction. Multiple-input multiple-output (MIMO) technology has become very important for high-speed wireless communications and is considered an essential part of the next fifth generation (5G) communication systems [].The combination of MIMO and orthogonal frequency division multiplexing (OFDM) makes the required large bandwidth of the future …
AI-mottagningPerformance Analysis of Massive MIMO-OFDM …
In this paper, the performance of the hybrid combination of massive MIMO and OFDM schemes augmented with fast Fourier transform (FFT), fractional Fourier transform (FrFT) or discrete wavelet transform (DWT) …
AI-mottagningEnergy efficiency optimization in adaptive massive MIMO
Given that, the exponential pace of growth in wireless traffic has continued for more than a century, wireless communication is one of the most influential innovations in recent years. Massive Multiple-Input Multiple-Output (M-MIMO) is a promising technology for meeting the world''s exponential growth in mobile data traffic, particularly in 5G networks. The most critical …
AI-mottagningEnergy efficiency optimisation in MIMO‐OFDMA systems with …
Multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) technology has been adopted as the technology for several broadband wireless …
AI-mottagningHybrid beamforming for downlink multiuser millimetre wave MIMO‐OFDM ...
Consider a downlink multi-user mmWave MIMO-OFDM system with a base station (BS) serving K users. The BS is equipped with antennas and RF chains, and each user employs antennas and RF chains as depicted in Fig. 1 is assumed that each user requires data streams, which means a total of data streams are transmitted by the BS. For the massive …
AI-mottagningEnergy Consumption Optimization Technique for Micro Base
width [18, 19]. MIMO-OFDM is one of the main technologies to realize the vision of 5G, which brings high spectrum utilization, good anti-multipath interference ability, and can effectively increase the channel capacity of communication system [20, 21]. Deploying MIMO-OFDM system into current base station architectures, especially micro base sta-
AI-mottagningPseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO-OFDM …
An energy and spectral efficient multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transmission scheme designed for the future sixth generation (6G) wireless communication networks and referred to as a ''''pseudo MIMO'''' system due to its ability to mimic the functionality of additional invisible RF chains. This article …
AI-mottagningPseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO …
hybrid MIMO system, the proposed pseudo MIMO system attains higher spectral efficiency while maintaining similar hardware complexity and power consumption. On the other hand, when …
AI-mottagningPseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO-OFDM …
Over the last three decades, significant progress has been made in the advancement of multiple-input multiple-output (MIMO) technology. This innovative approach has revolutionized the development of wireless communication technologies [1, 2, 3].MIMO technology has played an increasingly important role in fourth generation (4G) and fifth generation (5G) communication …
AI-mottagningPseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO-OFDM …
This article introduces an energy and spectral efficient multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transmission scheme designed for the future sixth generation (6G) wireless communication networks. The approach involves connecting each receiving radio frequency (RF) chain with multiple antenna elements and conducting sample …
AI-mottagningMassive MIMO-OFDM Performance Enhancement on 5G
Massive MIMO-OFDM-based cellular communication has recently become popular in a variety of realtime applications. However, as the need for high-quality communication grew, so did the number of ...
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