Multi-carrier modulation? Orthogonal Frequency Division Multi- plexing (OFDM) particularly? has been successfully applied to a wide variety of digital communications applications over the past several years. Although OFDM has been chosen as the physical layer standard for a diversity of important systems? the theory? algorithms? and implementation techniques remain subjects of current interest. This is clear from the high volume of papers appearing in technical journals and conferences.
標(biāo)簽: COMMUNICATIONS MULTI-CARRIER DIGITAL
上傳時間: 2020-05-31
上傳用戶:shancjb
Since the principle of multi-carrier code division multiple access (MC-CDMA) was simultaneously proposed by Khaled Fazel et al. and Nathan Yee et al. at the IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) in the year 1993, multi-carrier spread spectrum (MC-SS) has rapidly become one of the most wide spread independent research topics on the field of mobile radio communications. Therefore, the International Workshop on Multi-Carrier Spread Spectrum (MC-SS) was initiated in the year 1997. Multi-carrier and spread spectrum systems with their generic air interface and adaptive technologies are considered as potential candidates to fulfill the requirements of next generation mobile communications systems.
標(biāo)簽: Multi-Carrier Spectrum Spread 2007
上傳時間: 2020-05-31
上傳用戶:shancjb
Notwithstanding its infancy, wireless mesh networking (WMN) is a hot and growing field. Wireless mesh networks began in the military, but have since become of great interest for commercial use in the last decade, both in local area networks and metropolitan area networks. The attractiveness of mesh networks comes from their ability to interconnect either mobile or fixed devices with radio interfaces, to share information dynamically, or simply to extend range through multi-hopping.
標(biāo)簽: Multi-hop Networks Mesh
上傳時間: 2020-05-31
上傳用戶:shancjb
Notwithstanding its infancy, wireless mesh networking (WMN) is a hot and growing field. Wireless mesh networks began in the military, but have since become of great interest for commercial use in the last decade, both in local area networks and metropolitan area networks. The attractiveness of mesh networks comes from their ability to interconnect either mobile or fixed devices with radio interfaces, to share information dynamically, or simply to extend range through multi-hopping.
標(biāo)簽: Multi-hop Networks WiMAX WiFi Mesh LTE and
上傳時間: 2020-06-01
上傳用戶:shancjb
多功能虛擬儀器軟件-Multi-Instrument Pro
標(biāo)簽: 多功能虛擬儀器軟件-Multi-Instrument Pro
上傳時間: 2020-08-16
上傳用戶:
Design of Dual Band MIMO Antenna for 5G Smartphone Application
上傳時間: 2022-02-26
上傳用戶:xsr1983
UCGUI最新版源碼簡介 UCGUI3.90版源碼有如下幾點新的變化. 1.這個版本的UCGUI提供了模擬器的源碼(早知我不用那么辛苦反編譯出模擬器源碼了,不過大家可以比較一下看). 2.還有JPEG圖版支持 3.ListView控件支持. 4.Menu菜單支持. 5.ScrollBar滾動條支持. 6.multi-controller多控制器支持. 另外源碼上還有很多的調(diào)整, 將控件的功能分開到各個文件當(dāng)中更易于將來擴充, 大家仔細看看
上傳時間: 2013-07-11
上傳用戶:ywqaxiwang
并行總線PATA從設(shè)計至今已快20年歷史,如今它的缺陷已經(jīng)嚴重阻礙了系統(tǒng)性能的進一步提高,已被串行ATA(Serial ATA)即SATA總線所取代。SATA作為新一代磁盤接口總線,采用點對點方式進行數(shù)據(jù)傳輸,內(nèi)置數(shù)據(jù)/命令校驗單元,支持熱插拔,具有150MB/s(SATA1.0)或300MB/s(SATA2.0)的傳輸速度。目前SATA已在存儲領(lǐng)域廣泛應(yīng)用,但國內(nèi)尚無獨立研發(fā)的面向FPGA的SATAIP CORE,在這樣的條件下設(shè)計面向FPGA應(yīng)用的SATA IP CORE具有重要的意義。 本論文對協(xié)議進行了詳細的分析,建立了SATA IP CORE的層次結(jié)構(gòu),將設(shè)備端SATA IP CORE劃分成應(yīng)用層、傳輸層、鏈路層和物理層;介紹了實現(xiàn)該IPCORE所選擇的開發(fā)工具、開發(fā)語言和所選用的芯片;在此基礎(chǔ)上著重闡述協(xié)議IP CORE的設(shè)計,并對各個部分的設(shè)計予以分別闡述,并編碼實現(xiàn);最后進行綜合和測試。 采用FPGA集成硬核RocketIo MGT(RocketIo Multi-Gigabit Transceiver)實現(xiàn)了1.5Gbps的串行傳輸鏈路;設(shè)計滿足協(xié)議需求、適合FPGA設(shè)計的并行結(jié)構(gòu),實現(xiàn)了多狀態(tài)機的協(xié)同工作:在高速設(shè)計中,使用了流水線方法進行并行設(shè)計,以提高速度,考慮到系統(tǒng)不同部分復(fù)雜度的不同,設(shè)計采用部分流水線結(jié)構(gòu);采用在線邏輯分析儀Chipscope pro與SATA總線分析儀進行片上調(diào)試與測試,使得調(diào)試工作方便快捷、測試數(shù)據(jù)準(zhǔn)確;嚴格按照SATA1.0a協(xié)議實現(xiàn)了SATA設(shè)備端IP CORE的設(shè)計。 最終測試數(shù)據(jù)表明,本論文設(shè)計的基于FPGA的SATA IP CORE滿足協(xié)議需求。設(shè)計中的SATA IP CORE具有使用方便、集成度高、成本低等優(yōu)點,在固態(tài)電子硬盤SSD(Solid-State Disk)開發(fā)中應(yīng)用本設(shè)計,將使開發(fā)變得方便快捷,更能夠適應(yīng)市場需求。
上傳時間: 2013-06-21
上傳用戶:xzt
軟件無線電(SDR,Software Defined Radio)由于具備傳統(tǒng)無線電技術(shù)無可比擬的優(yōu)越性,已成為業(yè)界公認的現(xiàn)代無線電通信技術(shù)的發(fā)展方向。理想的軟件無線電系統(tǒng)強調(diào)體系結(jié)構(gòu)的開放性和可編程性,減少靈活性著的硬件電路,把數(shù)字化處理(ADC和DAC)盡可能靠近天線,通過軟件的更新改變硬件的配置、結(jié)構(gòu)和功能。目前,直接對射頻(RF)進行采樣的技術(shù)尚未實現(xiàn)普及的產(chǎn)品化,而用數(shù)字變頻器在中頻進行數(shù)字化是普遍采用的方法,其主要思想是,數(shù)字混頻器用離散化的單頻本振信號與輸入采樣信號在乘法器中相乘,再經(jīng)插值或抽取濾波,其結(jié)果是,輸入信號頻譜搬移到所需頻帶,數(shù)據(jù)速率也相應(yīng)改變,以供后續(xù)模塊做進一步處理。數(shù)字變頻器在發(fā)射設(shè)備和接收設(shè)備中分別稱為數(shù)字上變頻器(DUC,Digital Upper Converter)和數(shù)字下變頻器(DDC,Digital Down Converter),它們是軟件無線電通信設(shè)備的關(guān)鍵部什。大規(guī)模可編程邏輯器件的應(yīng)用為現(xiàn)代通信系統(tǒng)的設(shè)計帶來極大的靈活性。基于FPGA的數(shù)字變頻器設(shè)計是深受廣大設(shè)計人員歡迎的設(shè)計手段。本文的重點研究是數(shù)字下變頻器(DDC),然而將它與數(shù)字上變頻器(DUC)完全割裂后進行研究顯然是不妥的,因此,本文對數(shù)字上變頻器也作適當(dāng)介紹。 第一章簡要闡述了軟件無線電及數(shù)字下變頻的基本概念,介紹了研究背景及所完成的主要研究工作。 第二章介紹了數(shù)控振蕩器(NCO),介紹了兩種實現(xiàn)方法,即基于查找表和基于CORDIC算法的實現(xiàn)。對CORDIc算法作了重點介紹,給出了傳統(tǒng)算法和改進算法,并對基于傳統(tǒng)CORDIC算法的NCO的FPGA實現(xiàn)進行了EDA仿真。 第三章介紹了變速率采樣技術(shù),重點介紹了軟件無線電中廣泛采用的級聯(lián)積分梳狀濾波器 (cascaded integratot comb, CIC)和ISOP(Interpolated Second Order Polynomial)補償法,對前者進行了基于Matlab的理論仿真和FPGA實現(xiàn)的EDA仿真,后者只進行了基于Matlab的理論仿真。 第四章介紹了分布式算法和軟件無線電中廣泛采用的半帶(half-band,HB)濾波器,對基于分布式算法的半帶濾波器的FPGA實現(xiàn)進行了EDA仿真,最后簡要介紹了FIR的多相結(jié)構(gòu)。 第五章對數(shù)字下變頻器系統(tǒng)進行了噪聲綜合分析,給出了一個噪聲模型。 第六章介紹了數(shù)字下變頻器在短波電臺中頻數(shù)字化應(yīng)用中的一個實例,給出了測試結(jié)果,重點介紹了下變頻器的:FPGA實現(xiàn),其對應(yīng)的VHDL程序收錄在本文最后的附錄中,希望對從事該領(lǐng)域設(shè)計的技術(shù)人員具有一定參考價值。
標(biāo)簽: FPGA 軟件無線電 數(shù)字下變頻
上傳時間: 2013-06-30
上傳用戶:huannan88
The TW9910 is a multi-standard video decoder and encoder chip that is designed for multimedia applications. It uses the mixed-signal 1.8V CMOS technology to provide a low- power integrated solution.
上傳時間: 2013-04-24
上傳用戶:金宜
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