Emerging technologies such as WiFi and WiMAX are profoundly changing the landscape of wireless broadband. As we evolve into future generation wireless networks, a primary challenge is the support of high data rate, integrated multi- media type traffic over a unified platform. Due to its inherent advantages in high-speed communication, orthogonal frequency division MULTIPLEXING (OFDM) has become the modem of choice for a number of high profile wireless systems (e.g., DVB-T, WiFi, WiMAX, Ultra-wideband).
標簽： Broadband Wireless Networks
上傳時間： 2020-05-26
上傳用戶：shancjb
Employing multiple transmit and receive antennas, namely using multi-input multi-output (MIMO) systems, has proven to be a major breakthrough in providing reliable wireless communication links. Since their invention in the mid-1990s, transmit diversity, achieved through space-time coding, and spatial MULTIPLEXING schemes have been the focus of much research in the area of wireless communications.
標簽： Communication Systems Coding MIMO for
上傳時間： 2020-05-26
上傳用戶：shancjb
To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation (5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation (4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial MULTIPLEXING of multiple antennas. In the last twenty years, multiple-input multiple-output (MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array (which is also called massive MIMO) is equipped in a base-station, or a large number of distributed antennas (which is also called large-scale distributed MIMO) are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information (CSI) acquisition, wireless transmission technology, and resource allocation.
標簽： Large-scale Antenna Systems
上傳時間： 2020-05-27
上傳用戶：shancjb
At recent major international conferences on wireless communications, there have been several sessions on beyond third generation (3G) or fourth generation(4G)mobilecommunicationssystems,wheremodulation/demod- ulation and MULTIPLEXING/multiple access schemes related to multicarrier techniques have drawn a lot of attention. We often met at the conference venuesandrealizedthatnobookcoveredthebasicsofmulticarriertechniques to recent applications aiming at the 4G systems. Therefore, we decided to write a book on multicarrier techniques for 4G mobile communications systems.
標簽： Communications Multicarrier Techniques Mobile for 4G
上傳時間： 2020-05-31
上傳用戶：shancjb
All wireless communication standards, existing and under development, adopt or consider adopting orthogonal frequency-division MULTIPLEXING (OFDM) as the modulation technique. It is clear that OFDM has become the definitive modulation scheme in current and future wireless communication systems.
標簽： Baseband Receiver Design OFDM
上傳時間： 2020-05-31
上傳用戶：shancjb
Before delving into the details of orthogonal frequency division MULTIPLEXING (OFDM), relevant background material must be presented first. The purpose of this chapter is to provide the necessary building blocks for the development of OFDM principles. Included in this chapter are reviews of stochastic and random process, discrete-time signals and systems, and the Discrete Fourier Transform (DFT). Tooled with the necessary mathematical foundation, we proceed with an overview of digital communication systems and OFDM communication systems. We conclude the chapter with summaries of the OFDM wireless LAN standards currently in existence and a high-level comparison of single carrier systems versus OFDM.
上傳時間： 2020-05-31
上傳用戶：shancjb
Emerging technologies such as WiFi and WiMAX are profoundly changing the landscape of wireless broadband. As we evolve into future generation wireless networks, a primary challenge is the support of high data rate, integrated multi- media type traffic over a unified platform. Due to its inherent advantages in high-speed communication, orthogonal frequency division MULTIPLEXING (OFDM) has become the modem of choice for a number of high profile wireless systems (e.g., DVB-T, WiFi, WiMAX, Ultra-wideband).
標簽： OFDM-Based Broadband Networks Wireless
上傳時間： 2020-05-31
上傳用戶：shancjb
Since the advent of optical communications, a great technological effort has been devoted to the exploitation of the huge bandwidth of optical fibers. Start- ing from a few Mb/s single channel systems, a fast and constant technological development has led to the actual 10 Gb/s per channel dense wavelength di- vision MULTIPLEXING (DWDM) systems, with dozens of channels on a single fiber. Transmitters and receivers are now ready for 40 Gb/s, whereas hundreds of channels can be simultaneously amplified by optical amplifiers.
標簽： Communication Techniques Optical Theory and
上傳時間： 2020-05-31
上傳用戶：shancjb
面向 5G 的新型多載波傳輸技術(shù)比較 摘 要: 介紹了幾種面向 5G 的新型多載波傳輸技術(shù): 濾波器組多載波( FBMC，F(xiàn)ilter Bank Multicarri- er) 、通用濾波多載波( UFMC，Universal Filtered Multicarrier) 和廣義頻分復(fù)用( GFDM，Generalized Fre- quency Division MULTIPLEXING) 的基本原理，并從第五代移動通信系統(tǒng)( 5G) 支持的應(yīng)用場景和技術(shù)需求的 角度對三種多載波傳輸技術(shù)的優(yōu)缺點進行比較。研究表明三種多載波傳輸技術(shù)的帶外泄露較低，F(xiàn)BMC 系統(tǒng) 不使用 CP( CP，Cyclic Prefix) ，因此具有很高的時頻效率，但 FBMC 系統(tǒng)幀的長度比較長，不適合短 包類業(yè)務(wù); UFMC 對一組連續(xù)的子載波濾波，可以支持較短的幀結(jié)構(gòu)，但 UFMC 不使用 CP，復(fù)雜度較高; GFDM 基于獨立的塊調(diào)制，具有靈活的幀結(jié)構(gòu)，魯棒性好，復(fù)雜度比前兩者 低，便于實際應(yīng)用。 關(guān)鍵詞: 多載波; 第五代移動通信系統(tǒng); 濾波器組多載波; 通用濾波多載波; 廣義頻分復(fù)用
標簽： 5G
上傳時間： 2022-02-25
上傳用戶：kingwide
5G通信系統(tǒng)中massive-MIMO-FBMC技術(shù)的結(jié)合概述摘要為了應(yīng)對第五代移動通信（5G）中更高數(shù)據(jù)率和更低時延的需求，大規(guī)模MIMO （massive multiple-input multiple-output）技術(shù)已經(jīng)被提出并被廣泛研究。大規(guī)模 MIMO技術(shù)能大幅度地提升多用戶網(wǎng)絡(luò)的容量。而在5G中的帶寬研究方面，特別 是針對碎片頻譜和頻譜靈活性問題，現(xiàn)有的正交頻分多址（Orthogonal Frequency Division MULTIPLEXING, OFDM）技術(shù)不可能應(yīng)對未來的挑戰(zhàn)，新的波形方案需要 被設(shè)計出來。基于此，F(xiàn)BMC（filter bank multicarrier）技術(shù)由于具有比OFDM低 得多的帶外頻譜泄露而被受到重視，并已被標準推進組IMT-2020列為5G物理層 的主要備選方案之一。 本文首先回顧了5G中波形設(shè)計方案（主要是FBMC調(diào)制）和大規(guī)模多天線系 統(tǒng)（即massive MIMO）的現(xiàn)有工作和主要挑戰(zhàn)。然后，簡要介紹了基于Massive MIMO的FBMC系統(tǒng)中的自均衡性質(zhì)，該性質(zhì)可以用于減少系統(tǒng)所需的子載波數(shù) 目。同時，F(xiàn)BMC中的盲信道跟蹤性質(zhì)可以用于消除massive MIMO系統(tǒng)中的導(dǎo)頻 污染問題。盡管如此，如何將FBMC技術(shù)應(yīng)用于massive MIMO系統(tǒng)中的誤碼率、 計算復(fù)雜度、線性需求等方面仍然不明確，未來更多的研究工作需要在massive MIMO-FBMC方面展開來。 關(guān)鍵詞：大規(guī)模MIMO；FBMC；自均衡；導(dǎo)頻污染；盲均衡
標簽： 5G 通信系統(tǒng)
上傳時間： 2022-02-25
上傳用戶：
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