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同步數(shù)字復(fù)接的設(shè)計(jì)及其FPGA實(shí)現(xiàn) 在簡(jiǎn)要介紹同步數(shù)字復(fù)接基本原理的基礎(chǔ)上，采用VHDL語(yǔ)言對(duì)同步數(shù)字復(fù)接各組成模塊進(jìn)行了設(shè)計(jì)，并在ISE集成環(huán)境下進(jìn)行了設(shè)計(jì)描述、綜合、布局布線(xiàn)及時(shí)序仿真，取得了正確的設(shè)計(jì)結(jié)果，同時(shí)利用中小容量的FPGA實(shí)現(xiàn)了同步數(shù)字復(fù)接功能。 基群速率數(shù)字信號(hào)的合成設(shè)備和分接設(shè)備是電信網(wǎng)絡(luò)中使用較多的關(guān)鍵設(shè)備，在數(shù)字程控交換機(jī)的用戶(hù)模塊、小靈通基站控制器和集團(tuán)電話(huà)中都需要使用這種同步數(shù)字復(fù)接設(shè)備。近年來(lái)，隨著需要自建內(nèi)部通信系統(tǒng)的公司和企業(yè)不斷增多，同步數(shù)字復(fù)接設(shè)備的使用需求也在增加。FPGA(現(xiàn)場(chǎng)可編程門(mén)陣列)器件的高性能簡(jiǎn)化了數(shù)字通信系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)。本文基于FPGA的技術(shù)特點(diǎn)，結(jié)合數(shù)字復(fù)接技術(shù)的基本原理，實(shí)現(xiàn)了基群速率(2048kbps)數(shù)字信號(hào)的數(shù)字分接與復(fù)接。
標(biāo)簽： FPGA 數(shù)字復(fù)接
上傳時(shí)間： 2013-12-20
上傳用戶(hù)：ommshaggar
TD-SCDMA，1基站1單天線(xiàn)用戶(hù)系統(tǒng)，瑞利多徑信道，聯(lián)合檢測(cè)（JD）matlab程序。如需多用戶(hù)，只需發(fā)送端填充用戶(hù)數(shù)據(jù)疊加即可。
標(biāo)簽： TD-SCDMA
上傳時(shí)間： 2017-08-23
上傳用戶(hù)：3到15
采用MICROCHIP單片機(jī)，U2270B基站芯片做的讀卡器源程序
上傳時(shí)間： 2017-09-18
上傳用戶(hù)：hebmuljb
AD公司的接收芯片，芯片中包括混頻器，放大器，限幅放大器。多用于基站的應(yīng)用方面。
標(biāo)簽： AD608
上傳時(shí)間： 2016-01-22
上傳用戶(hù)：dovelz
由于中國(guó)電信CDMA網(wǎng)絡(luò)發(fā)展到3G 之后，沒(méi)有后續(xù)演進(jìn)路線(xiàn)。所以中國(guó)電信 必然全力以赴建設(shè)基于FDD的NB-IoT 網(wǎng)絡(luò)，不存在選擇上的糾結(jié)， 力量用在一 處。5月17日， 中國(guó)電信宣布建成全球目前 覆蓋最廣的商用新一代物聯(lián)網(wǎng)（NB-IoT） 網(wǎng)絡(luò)， 實(shí)現(xiàn)31萬(wàn)個(gè)基站升級(jí)。
標(biāo)簽： NB-IoT 中國(guó)電信 發(fā)展
上傳時(shí)間： 2018-06-01
上傳用戶(hù)：cc2018
With billions of ‘people and things’ becoming increasingly connected, the need to combine the potential of unlicensed and licensed wireless services has become an imperative for the operators, cities, high density venues and players focused on key market opportunities such as IoT, big data and 5G. The WBA has developed Vision 2020 to harness its experience of creating seamlessly interconnected wireless services in new and emerging areas.
標(biāo)簽： WBA_FullIndustryReport
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
4G Americas is an industry trade organization composed of leading telecommunications service providers and manufacturers. The organization's mission is to advocate for and foster the advancement and full capabilities of the LTE mobile broadband technology and its evolution beyond to 5G, throughout the ecosystem's networks, services, applications and wirelessly connected devices in the Americas. 4G Americas, the voice of 5G for the Americas, is invested in leading 5G development for the Americas and maintaining the current global innovation lead in North America with LTE technology.
標(biāo)簽： Development Caribbean Broadband Markets Mobile
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
Device-to-device(D2D) communications are now considered as an integral part of future 5G networks which will enable direct communication between user equipment (UE) without unnecessary routing via the network infrastructure. This architecture will result in higher throughputs than conventional cellular networks, but with the increased potential for co-channel interference induced by randomly located cellular and D2D UEs.
標(biāo)簽： Device-to-Device Communications Analysis of
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
Wireless technologies like GSM, UMTS, LTE, Wireless LAN and Bluetooth have revolutionized the way we communicate by making services like telephony and Internet access available anytime and from almost anywhere. Today, a great variety of technical publications offer background information about these technologies but they all fall short in one way or another. Books covering these technologies usually describe only one of the systems in detail and are generally too complex as a first introduction. The Internet is also a good source, but the articles one finds are usually too short and super- ficial or only deal with a specific mechanism of one of the systems. For this reason, it was difficult for me to recommend a single publication to students in my telecommunication classes, which I have been teaching in addition to my work in the wireless telecommunication industry. This book aims to change this.
標(biāo)簽： LTE-Advanced From GSM Pro and 5G to
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
The recent developments in full duplex (FD) commu- nication promise doubling the capacity of cellular networks using self interference cancellation (SIC) techniques. FD small cells with device-to-device (D2D) communication links could achieve the expected capacity of the future cellular networks (5G). In this work, we consider joint scheduling and dynamic power algorithm (DPA) for a single cell FD small cell network with D2D links (D2DLs). We formulate the optimal user selection and power control as a non-linear programming (NLP) optimization problem to get the optimal user scheduling and transmission power in a given TTI. Our numerical results show that using DPA gives better overall throughput performance than full power transmission algorithm (FPA). Also, simultaneous transmissions (combination of uplink (UL), downlink (DL), and D2D occur 80% of the time thereby increasing the spectral efficiency and network capacity
標(biāo)簽： Full-Duplex Cells Small
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
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