دانلود رایگان مقاله لاتین بهینه سازی سوپاپ از سایت الزویر
عنوان فارسی مقاله:
بهینه سازی توزیع سوپاپ بررسی عمل در سیستم های MIMO مقیاس بزرگ چند سلولی
عنوان انگلیسی مقاله:
Pilot distribution optimization in multi-cellular large scale MIMO systems
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Multiple-input–multiple-output (MIMO) techniques constitute one of the key features in most of recent telecommunications standards, such as WiFi, WiMAX, LTE [6]. In order to fully exploit the benefits of MIMO systems, a new concept has been proposed by increasing the number of base station (BS) antennas N to infinity [9]. This massive MIMO systems are viewed as a potential technology for physical layer in next telecommunications standards, such as 5G [2]. A review of most important results recently disseminated in this theme can be found in [17]. It was shown in [9] that in a time division duplex (TDD) noncooperative multi-cell MIMO system, employing training pilots for channel state information (CSI) acquisition in the uplink and an infinite number of BS antennas, the effects of uncorrelated thermal noise and fast fading are averaged out. Hence, the only factor that remains limiting performance in the large MIMO scenario is intercell interference, that when associated with the finite time available to send pilot sequences makes the estimated CSI at one BS ‘‘contaminated” by the CSI of users in adjacent cells, in the socalled pilot contamination effect. This phenomenon results from unavoidable reuse of reverse-link pilot sequences by terminals in different cells. As a consequence of increasing the number of BS antennas to infinity, the transmit power can be designed arbitrarily small, since interference decreases in the same rate of the desired signal power, i.e., signal-to-interference-plus-noise ratio (SINR) is independent of transmit power [9]. Alternative strategies to achieve better CSI estimates exist, such as (a) frequency division duplex (FDD) [3], in which pilots for CSI acquisition are transmitted in downlink, and estimates are fed back to BS in a feedback channel; and (b) network MIMO [7], where CSI and information data of different coordinated cells are shared among them in a backhaul link, creating a distributed antenna array that serves the users altogether. However, both schemes become unfeasible when N ! 1 [9], since lengths of forward pilot sequences and capacity of backhaul links increase substantially with N. Therefore, TDD has been assumed in this work without CSI sharing among different cells
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کلمات کلیدی:
Pilot distribution optimization in multi-cellular large scale MIMO systems https://www.infona.pl/.../bwmeta1.element.elsevier-f2f1e695-2938-32bf-b527-f46fb3a0... by JC Marinello - 2016 - Cited by 2 - Related articles Salient characteristics of a wireless communication system deploying a great number of antennas at the base station (BS), namely a massive MIMO system, are ... Advanced Wireless Networks: Technology and Business Models https://books.google.com/books?isbn=1119096855 Savo G. Glisic - 2016 - Technology & Engineering ... 12.4 Joint AP Selection and Beamforming Optimization 463 12.4.1 Network Model ... 14.1 Evolution Towards Large-Scale Networks 486 14.1.1 Types of Networks ... Massive MIMO 499 15.1 Linearly Precoded Multicellular Downlink System ... Jun Zhang's Homepage www.ece.ust.hk/~eejzhang/ 2016, paper "Large-Scale Convex Optimization for Dense Wireless ... "Millimeter-Wave MIMO Communications for 5G Networks", 2016-2019, RGC General ... and computational resource management for multi-user mobile-edge computing ... Resource Allocation in Next-Generation Broadband Wireless Access ... https://books.google.com/books?isbn=1522520244 Singhal, Chetna, De, Swades - 2017 - Computers The range expansion was introduced to increase the pico-cell's affiliated users ... and solved using optimization methods in a multi-cell OFDMA-based system. ... A large number of antennas were assumed at the macrocell (massive-MIMO), ... Cooperative multi-cellular large MIMO over asynchronous channel ... onlinelibrary.wiley.com/doi/10.1002/dac.3004/full Jun 22, 2015 - Cooperative multi-cellular large MIMO over asynchronous channel training ... Furthermore, noise may be averaged out as the SINR of MTs scales with the ... It is noteworthy that there are other optimization targets, for example, ... [PDF]Spectrum and Energy Efficiency of Uplink Massive MIMO System with ... www.mdpi.com/1999-5903/9/2/12/pdf by X Wang - 2017 Apr 13, 2017 - investigated for an uplink massive multiple-input multiple-output (MIMO) ... the cellular user equipments (CUEs) and the D2D link are derived in ... maximized by jointly optimizing the transmit power of CUEs and the number of BS antennas. ... Compared with the traditional MIMO system, the large-scale ...
