802.11x客戶端lllllllllllllllll
標(biāo)簽： lllllllllllllllll 802.11
上傳時間： 2017-07-23
上傳用戶：蟲蟲蟲蟲蟲蟲
微電腦型RS-485顯示電表（24*48mm/48*96mm） 特點： 5位數(shù)RS-485顯示電表 顯示范圍-19999-99999位數(shù) 通訊協(xié)議Modbus RTU模式 寬范圍交直流兩用電源設(shè)計 尺寸小,穩(wěn)定性高 主要規(guī)格： 顯示范圍:-19999~99999 digit RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF" RS-485通訊協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 10.16 mm (0.4") (MMX-RS-11x) Red high efficiency LEDs high 20.32 mm (0.8") (MMX-RS-12X) Red high efficiency LEDs high 10.16 mm (0.4")x2 (MMX-RS-22X) 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/power) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間： 2015-01-03
上傳用戶：feitian920
OFDM Modem Applications • Digital Video Broadcast (DVB) • Digital Audio Broadcast (DAB) • Broadband Wireless Access (802.16x) • Wireless LAN (802.11x & HiperLAN) Orthogonal OFDM Sub-carriers Orthogonal Frequency Division Multiplexing (OFDM)
標(biāo)簽： Broadcast Digital 8226 Applications
上傳時間： 2016-03-23
上傳用戶：cc1
動態(tài)口令身份認(rèn)證解決方案，主要介紹關(guān)于動態(tài)的802.11x等身份認(rèn)證機制
標(biāo)簽： 動態(tài)口令 身份認(rèn)證 方案
上傳時間： 2013-12-26
上傳用戶：VRMMO
無線網(wǎng)絡(luò)技術(shù)的發(fā)展日新月異，各種802.11x標(biāo)準(zhǔn)不斷被更新，新的無線網(wǎng)絡(luò)架構(gòu)和技術(shù)也不斷被提出。正當(dāng)無線局域網(wǎng)（WLAN）的發(fā)展方興未艾時，一種新的無線Mesh網(wǎng)絡(luò)（無線網(wǎng)狀網(wǎng)絡(luò)）又出現(xiàn)了。無線Mesh網(wǎng)絡(luò)的核心指導(dǎo)思想是讓網(wǎng)絡(luò)中的每個節(jié)點都可以發(fā)送和接收信號，傳統(tǒng)的WLAN一直存在的可伸縮性低和健壯性差等諸多問題由此迎刃而解。無線Mesh技術(shù)的出現(xiàn)，代表著無線網(wǎng)絡(luò)技術(shù)的又一大跨越，有極為廣闊的應(yīng)用前景。
標(biāo)簽： 無線網(wǎng)絡(luò)技術(shù) 發(fā)展
上傳時間： 2017-08-03
上傳用戶：yyyyyyyyyy
Wireless communications has become a field of enormous scientific and economic interest. Recent success stories include 2G and 3G cellular voice and data services (e.g., GSM and UMTS), wireless local area networks (WiFi/IEEE 802.11x), wireless broadband access (WiMAX/IEEE 802.16x), and digital broadcast systems (DVB, DAB, DRM). On the physical layer side, traditional designs typically assume that the radio channel remains constant for the duration of a data block. However, researchers and system designers are increasingly shifting their attention to channels that may vary within a block. In addition to time dispersion caused by multipath propagation, these rapidly time-varying channels feature frequency dispersion resulting from the Doppler effect. They are, thus, often referred to as being “doubly dispersive.”
標(biāo)簽： Time-Varying Channels
上傳時間： 2020-06-01
上傳用戶：shancjb
蟲蟲下載站版權(quán)所有 京ICP備2021023401號-1
