Many wireless communications channels consist of multiple signal paths from the transmitter to receiver. This multiplicity of paths leads to a phenomenon known as multipath fading. The multiple paths are caused by the presence of objects in the physical environment that, through the mechanisms of propagation, alter the path of radiated energy. These objects are referred to as scatterers. In the past, researchers often looked at ways to mitigate multipath scattering, such as in diversity systems. Multiple-input, multiple-output (Mimo) systems, on the other hand, use multipath diversity to their advantage; a Mimo system has the ability to translate increased spatial diversity into increased channel capacity.
標簽： Multiple-Output Multiple-Input Channel Models
上傳時間： 2020-05-31
上傳用戶：shancjb
The family of recent wireless standards included the optional employment of Mimo tyechniques. This was motivated by the observation according to the classic Shannon-Hartley law the achiev- able channel capacity increases logarithmically with the transmit power. By contrast, the Mimo capacity increases linearly with the number of transmit antennas, provided that the number of receive antennas is equal to the number of transmit antennas.
標簽： Simulation Modeling Network and
上傳時間： 2020-05-31
上傳用戶：shancjb
Mobile and wireless communication systems are a prominent communications technology of the twenty-first century with profound economic and social impacts in practically all parts of the world. The current state of wireless communication systems allows for a much wider scope of applications than what it used to be originally, that is, to be a mobile extension of the public switched telephone network.
標簽： Allocation Resource Mimo and
上傳時間： 2020-06-01
上傳用戶：shancjb
The multiple-input multiple-output (Mimo) technique provides higher bit rates and better reliability in wireless systems. The efficient design of RF transceivers has a vital impact on the implementation of this technique. This first book is com- pletely devoted to RF transceiver design for Mimo communications. The book covers the most recent research in practical design and applications and can be an important resource for graduate students, wireless designers, and practical engineers.
標簽： Transceiver Design RF
上傳時間： 2020-06-01
上傳用戶：shancjb
Driven by the desire to boost the quality of service of wireless systems closer to that afforded by wireline systems, space-time processing for multiple-input multiple-output (Mimo) wireless communications research has drawn remarkable interest in recent years. Excit- ing theoretical advances, complemented by rapid transition of research results to industry products and services, have created a vibrant and growing area that is already established by all counts. This offers a good opportunity to reflect on key developments in the area during the past decade and also outline emerging trends.
標簽： Space-Time Processing
上傳時間： 2020-06-01
上傳用戶：shancjb
An acronym for Multiple-In, Multiple-Out, Mimo communication sends the same data as several signals simultaneously through multiple antennas, while still utilizing a single radio channel. This is a form of antenna diversity, which uses multiple antennas to improve signal quality and strength of an RF link. The data is split into multiple data streams at the transmission point and recombined on the receive side by another Mimo radio configured with the same number of antennas. The receiver is designed to take into account the slight time difference between receptions of each signal, any additional noise or interference, and even lost signals.
標簽： Understanding_the_Basics_of_Mimo
上傳時間： 2020-06-01
上傳用戶：shancjb
Mobile radio communications are evolving from pure telephony systems to multimedia platforms offering a variety of services ranging from simple file transfers and audio and video streaming, to interactive applications and positioning tasks. Naturally, these services have different constraints concerning data rate, delay, and reliability (quality-of-service (QoS)). Hence, future mobile radio systems have to provide a large flexibility and scal- ability to match these heterogeneous requirements.
標簽： Communications Wireless Channels Mimo over
上傳時間： 2020-06-01
上傳用戶：shancjb
1. 引言2. 概述3.3.1 100Mbps 以上的邊緣速率3.3.2 99.999% 高可靠性和≤ 1ms 的超低時延3.3.3 1 個連接/ 平方米3.3.4 其他3.3.5 小結4.1.1 高頻組網(wǎng)傳播損耗與穿透損耗大，室外覆蓋室內難4.1.2 無源分布式天線系統(tǒng)演進難、綜合損耗大、互調干擾大3.1 5G 三大業(yè)務類型3.2 室內5G 業(yè)務及特征3.3 室內5G 業(yè)務對網(wǎng)絡的需求4.2 多樣化的業(yè)務要求網(wǎng)絡具備更大的彈性容量4.3 行業(yè)應用要求網(wǎng)絡具備極高可靠性4.4 四代共存網(wǎng)絡及新業(yè)務發(fā)展要求網(wǎng)絡具有高效運維、智能運營能力4.5 小結5.1 組網(wǎng)策略： 高中低頻分層組網(wǎng)，提供更大容量5.2 Mimo 選擇策略：標配4T4R，提供更好的用戶體驗5.3 方案選擇策略：大容量數(shù)字化方案是必然選擇5.4 容量策略：彈性容量，靈活按需滿足業(yè)務需求5.5 可靠性策略：面向5G 業(yè)務的可靠性設計5.6 部署策略：端到端數(shù)字化部署，奠定網(wǎng)絡運維和運營的基礎5.7 網(wǎng)絡運維策略：可視化運維，實現(xiàn)室內5G 網(wǎng)絡可管可控5.8 網(wǎng)絡運營策略：基于網(wǎng)絡運營平臺，支撐室內5G 網(wǎng)絡智能運營5.9 小結
上傳時間： 2022-01-30
上傳用戶：qdxqdxqdxqdx
在傳輸速率方面，802.11n可以將WLAN的傳輸速率由目前802.11a及802.11g提供的54Mbps，提高到300Mbps甚至高達600Mbps.得益于將Mimo（多入多出）與OFDM（正交頻分復用）技術相結合而應用的Mimo OFDM技術，提高了無線傳輸質量，也使傳輸速率得到極大提升。現(xiàn)有的802.11n無線AP/路由設備主要是150M和300M產(chǎn)品，這兩種產(chǎn)品的實用性較高，價格相對低廉。由于802.11n方案的規(guī)定，單天線產(chǎn)品只能是150M產(chǎn)品，只有雙/天線以上，才能達到更高的速度現(xiàn)有的802.11n無線網(wǎng)卡主要是150M（手機）、300M（主流筆記本），450M（蘋果筆記本）。使用的頻率分別為2.4G（所有設備均支持）和5G（少量手機和多數(shù)的蘋果設備）。盡管802.11n標稱的數(shù)據(jù)都很大，最大理論值達到了600M，但實際上由于信道污染、各類干擾、阻擋物等，并不可能達到這種速度由于現(xiàn)在蘋果設備的普及，5G的無線網(wǎng)卡均安裝在最新的MBP/MBA/IPAD中，因此使用5G的用戶也是較為可觀的。同時在較新的Windows筆記本中，雙頻無線網(wǎng)卡也還是越來越多的被應用。
標簽： 5G
上傳時間： 2022-06-20
上傳用戶：jason_vip1
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上傳時間： 2013-05-15
上傳用戶：eeworm
