Advances in MIMO : System Model and Potentials (original) (raw)
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Overview and recent challenges of MIMO systems
The primary objective of this article is to provide an overview of techniques for multiple-input multiple-output, (MIMO) wireless communication systems. Information theoretic background of the szgnificant capacity enhancement supported by MIMO radio network ,configurations is first explained. Current' activities towards the utilization of MIMO concepts in the third generation systems as well,as recent challenges in signal processing for single carrier sig-. naling-based MIMO communication systems are then introduced. '
Advances in MIMO Techniques for Mobile Communications—A Survey
Int'l J. of Communications, Network and System Sciences, 2010
This paper provides a comprehensive overview of critical developments in the field of multiple-input multiple-output (MIMO) wireless communication systems. The state of the art in single-user MIMO (SU-MIMO) and multiuser MIMO (MU-MIMO) communications is presented, highlighting the key aspects of these technologies. Both open-loop and closed-loop SU-MIMO systems are discussed in this paper with particular emphasis on the data rate maximization aspect of MIMO. A detailed review of various MU-MIMO uplink and downlink techniques then follows, clarifying the underlying concepts and emphasizing the importance of MU-MIMO in cellular communication systems. This paper also touches upon the topic of MU-MIMO capacity as well as the promising convex optimization approaches to MIMO system design.
MIMO: State of the Art and the Future in Focus
2016
Antennas of transmitters and receivers have been manipulated to increase the capacity of transmission and reception of signals. Using many elements in antennas to shape beams and direct nulls in a particular point for optimum signal transmission and reception has over decades, had tremendous positive influence in received power and signal to noise ratio (SNR). However, since the antenna elements manipulation can be done both at base station and device terminal, it gives rise to an important method of using several antennas to put and obtain signals to and from space with increased capacity. This principle is termed Multiple-input and Multiple-output (MIMO). This paper discusses application of MIMO in the state of the art and next generation of wireless systems (5G). It also discusses four models of MIMO; SISO, SIMO, MISO and MIMO, considering three method of combing the signals from multipath propagations; Selection combining (SC), Equal gain combing (EGC) and maximum ratio combinin...
Design and study of MIMO systems studied
In this research, we are interested in a telecommunications system MIMO (multiple input multiple output) spatial multiplexing in OFDM context. ) . The objective of this work is to study and improve the transmission and reception of this MIMO (Multiple Input Multiple Output) systems technology in a multi -carrier OFDM context (Orthogonal Frequency Division Multiplex), which enables a frequency-selective channel into multiple non-selective channels. The combination of MIMO and OFDM allows exploiting the benefits of the two methods: the strength of binding on frequency-selective channels for OFDM and robustness on uncorrelated in space for the MIMO channel coding. For different configurations of multi-antenna systems SISO, SIMO and MIMO, a comparative study is made between them. This study shows that the MIMO configuration associated with the OFDM technique provides a significant performance improvement compared to other case studies.
MIMO System for a 5 G Wireless Communication Networks : A Key to Gigabit Wireless System
2015
This article presents on 5G mobile networks. The 4G wireless communication systems have been deployed or are soon to be deployed in all over world . However, with an growth of wireless services and mobile devices, there are still some challenges that cannot be accommodated even by fourth generation, such as high energy consumption and the spectrum crisis. Wireless network designers have been facing the continuously increasing demand for high data rates and mobility required by new wireless applications and therefore have started research on fifth generation wireless systems that are expected to be deployed beyond 2020. In this paper, we propose a potential cellular architecture that outdoor scenarios, separates indoor and discuss technologies for 5G wireless communication networks, such as Multiple Input Multiple Output (MIMO). The focus of the present article is on advanced techniques for higher spectral efficiency and improved coverage for cell edge users. New applications with a ...
Evaluation of massive MIMO considering real propagation characteristics in the 20 GHz band
IEEE Transactions on Antennas and Propagation, 2017
This paper presents multiple-input multiple-output (MIMO) measurements in the 20-GHz band, and evaluates the basic performance of massive MIMO systems when considering 100 elements at a base station (BS) and seven user equipment units. First, it is shown that zero forcing (ZF) is essential as a transmission scheme in massive MIMO systems, whereas the maximum-ratio combining method cannot reduce interference effectively in such systems. In addition, it is shown that analog-digital hybrid beamforming can be used to reduce the calculation complexity and improve hardware implementation. Next, we compared the Shannon capacity with the achievable bit rate (ABR), using ZF for seven-user MIMO transmissions with 100 elements at the BS. When the number of degrees of freedom in the array antenna is guaranteed, the ABR is almost the same as the Shannon capacity. Moreover, multiuser transmission is realized by linear decoding. Thus, decoding methods such as ZF are effective in massive MIMO systems. Index Terms-Analog-digital hybrid beamforming, eigenvalues, massive multiple-input multiple-output (MIMO), Shannon capacity, zero forcing (ZF). I. INTRODUCTION T HE volume of data transferred over wireless communication channels is almost doubling every year, owing to the popularity of smartphones and wireless local area networks. Thus, data communication at high speeds in excess of 10 to 20 Gb/s is necessary for future wireless communication systems [1]-[3]. In this context, multiple-input multiple-output (MIMO) systems have attracted significant attention because they can improve transmission rates within a limited frequency band [4], [5]. Moreover, these systems have already been developed as commercial products in accordance with the Long-Term Evolution (LTE) and the IEEE 802.11n standards [6], [7]. In multiuser MIMO (MU-MIMO) systems, the channel capacity is improved by employing a transmission rate between a base station (BS) and multiple user equipment (UE) units, where the UE has a small number of antennas [8]-[10].
EURASIP Journal on Wireless Communications and Networking, 2011
A relatively recent idea of extending the benefits of MIMO systems to multiuser scenarios seems promising in the context of achieving high data rates envisioned for future cellular standards after 3G (3rd Generation). Although substantial research has been done on the theoretical front, recent focus is on making Multiuser Multiple-Input Multiple-Output (MUMIMO) practically realizable. This paper presents an overview of the different MU-MIMO schemes included/being studied in 3GPP standardization from LTE (long-term evolution) ...
TO ASSESS THE IMPORTANCE OF SMALL CELLS AND MULTI POINT OF THE MASSIVE MIMO IN 5G CELLULAR
Massive multiple input, multiple output (MIMO) is an exciting area of 5G wireless research. For the next-generation wireless data networks, it promises the significant gains that offer the ability to accommodate more users at higher data rates with better reliability while consuming less power. In communications, the MIMO implies multiple-input and multiple-output and is used by combinations of multiple transmitters/receivers or antennas at both sides of digital communication systems. It can be termed as a replica of the smart antennas array group. In the wireless communications MIMO techniques is evolving technology that offers considerable increase in data bandwidth without any extra transmission power.