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(biāo)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(biāo)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(biāo)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(biāo)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(biāo)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(jié)4.1.1 高頻組網(wǎng)傳播損耗與穿透損耗大，室外覆蓋室內(nèi)難4.1.2 無源分布式天線系統(tǒng)演進(jìn)難、綜合損耗大、互調(diào)干擾大3.1 5G 三大業(yè)務(wù)類型3.2 室內(nèi)5G 業(yè)務(wù)及特征3.3 室內(nèi)5G 業(yè)務(wù)對網(wǎng)絡(luò)的需求4.2 多樣化的業(yè)務(wù)要求網(wǎng)絡(luò)具備更大的彈性容量4.3 行業(yè)應(yīng)用要求網(wǎng)絡(luò)具備極高可靠性4.4 四代共存網(wǎng)絡(luò)及新業(yè)務(wù)發(fā)展要求網(wǎng)絡(luò)具有高效運(yùn)維、智能運(yùn)營能力4.5 小結(jié)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(biāo)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(wù)需求5.5 可靠性策略：面向5G 業(yè)務(wù)的可靠性設(shè)計5.6 部署策略：端到端數(shù)字化部署，奠定網(wǎng)絡(luò)運(yùn)維和運(yùn)營的基礎(chǔ)5.7 網(wǎng)絡(luò)運(yùn)維策略：可視化運(yùn)維，實現(xiàn)室內(nèi)5G 網(wǎng)絡(luò)可管可控5.8 網(wǎng)絡(luò)運(yùn)營策略：基于網(wǎng)絡(luò)運(yùn)營平臺，支撐室內(nèi)5G 網(wǎng)絡(luò)智能運(yùn)營5.9 小結(jié)
上傳時間： 2022-01-30
上傳用戶：qdxqdxqdxqdx
802.11n標(biāo)準(zhǔn)，是11n的基礎(chǔ)文檔，詳細(xì)描述了11n的技術(shù)細(xì)節(jié)，比如幀管理、LDPC、PPDU、STBC和PHY等規(guī)定。工作中會時不時翻出來查一下，是很好的學(xué)習(xí)和工作文檔。
上傳時間： 2022-04-22
上傳用戶：bluedrops
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(dá)600Mbps.得益于將MIMO（多入多出）與OFDM（正交頻分復(fù)用）技術(shù)相結(jié)合而應(yīng)用的MIMO OFDM技術(shù)，提高了無線傳輸質(zhì)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(shè)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(dá)到更高的速度現(xiàn)有的802.11n無線網(wǎng)卡主要是150M（手機(jī)）、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(shè)備均支持）和5G（少量手機(jī)和多數(shù)的蘋果設(shè)備）。盡管802.11n標(biāo)稱的數(shù)據(jù)都很大，最大理論值達(dá)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(dá)到這種速度由于現(xiàn)在蘋果設(shè)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(yīng)用。
標(biāo)簽： 5G
上傳時間： 2022-06-20
上傳用戶：jason_vip1
Overview The MT7628 router-on-a-chip includes an 802.11n MAC and baseband,a 2.4 GHz radio and FEM,a 575/580MHz MIPS? 24K% CPU core,a 5-port 10/100 fast ethernet switch. The MT7628 includes everything needed to build an AP router from a single chip. The embedded high performance CPU can process advanced applications effortlessly, such as routing, security and VolP. The MT7628 also includes a selection of interfaces to support a variety of applications, such as a USB port for accessing external storage.Features· Embedded MIPS24KEc(575/580 MHz) with 64KBl-Cache and 32 KB D-Cache·2T2R 2.4 GHz with 300 Mbps PHY data rate· Legacy 802.11b/g and HT 802.11n modes·20/40 MHz channel bandwidth· Reverse Data Grant(RDG)· Maximal Ratio Combining(MRC)· Space Time Block Coding(STBC)· MCM 8 Mbytes DDR1 KGD(MT7628KN)
標(biāo)簽： mt7628
上傳時間： 2022-07-18
上傳用戶：
The following table covers the main features offered by the MT7628KN and MT7628AN. Overall, the MT7628KN supports the requirements of an entry level AP/router, while the more advanced MT7628AN supports a number of interfaces together with a large maximum RAM capacity.Features· Embedded MIPS24KEc (575/580 MHz) with 64KBl-Cache and 32KB D-Cache·2T2R 2.4GHz with 300 Mbps PHY data rate· Legacy 802.11b/g and HT 802.11n modes·20/40 MHz channel bandwidth· Reverse Data Grant(RDG)· Maximal Ratio Combining(MRC)· Space Time Block Coding(STBC)· MCM 8 Mbytes DDR1 KGD(MT7628KN)·16-bit DDR1/2 up to 128/256 Mbytes(MT7628AN/KN)· SPI/SD-XC/eMMC·x1 USB 2.0 Host,x1 Ple Root Complex·5-port 10/100 FE PHY
標(biāo)簽： mt7628
上傳時間： 2022-07-25
上傳用戶：
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