The aim of this book, the first of two volumes, is to present selected research that has been undertaken under COST Action IC0902 ‘‘cognitive Radio and Net- working for Cooperative Coexistence of Heterogeneous Wireless Networks’’ (http://newyork.ing.uniroma1.it/IC0902/). COST (European Cooperation in Sci- ence and Technology) is one of the longest-running European frameworks sup- porting cooperation among scientists and researchers across Europe.
標(biāo)簽： Communication cognitive
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
The idea of writing this book entitled “cognitive Networked Sensing and Big Data” started with the plan to write a briefing book on wireless distributed computing and cognitive sensing. During our research on large-scale cognitive radio network (and its experimental testbed), we realized that big data played a central role. As a result, the book project reflects this paradigm shift. In the context, sensing roughly is equivalent to “measurement.”
標(biāo)簽： cognitive Networked Sensing Data Big and
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
This introduction takes a visionary look at ideal cognitive radios (CRs) that inte- grate advanced software-defined radios (SDR) with CR techniques to arrive at radios that learn to help their user using computer vision, high-performance speech understanding, global positioning system (GPS) navigation, sophisticated adaptive networking, adaptive physical layer radio waveforms, and a wide range of machine learning processes.
標(biāo)簽： Technology cognitive Radio
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
cognitive radio has emerged as a promising technology for maximizing the utiliza- tion of the limited radio bandwidth while accommodating the increasing amount of services and applications in wireless networks. A cognitive radio (CR) transceiver is able to adapt to the dynamic radio environment and the network parameters to maximize the utilization of the limited radio resources while providing flexibility in wireless access. The key features of a CR transceiver are awareness of the radio envi- ronment (in terms of spectrum usage, power spectral density of transmitted/received signals, wireless protocol signaling) and intelligence.
標(biāo)簽： cognitive Wireless Network
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
cognitive radios have become a vital solution that allows sharing of the scarce frequency spectrum available for wireless systems. It has been demonstrated that it can be used for future wireless systems as well as integrated into 4G/5G wireless systems. Although there is a great amount of literature in the design of cognitive radios from a system and networking point of view, there has been very limited available literature detailing the circuit implementation of such systems. Our textbook, Radio Frequency Integrated Circuit Design for cognitive Radios, is the first book to fill a disconnect in the literature between cognitive Radio systems and a detailed account of the circuit implementation and architectures required to implement such systems. In addition, this book describes several novel concepts that advance state-of-the-art cognitive radio systems.
標(biāo)簽： cognitive Systems Design Radio RFIC for
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
Resource allocation is an important issue in wireless communication networks. In recent decades, cognitive radio technology and cognitive radio-based networks have obtained more and more attention and have been well studied to improve spectrum utilization and to overcomethe problem of spectrum scarcity in future wireless com- munication systems. Many new challenges on resource allocation appear in cogni- tive radio-based networks. In this book, we focus on effective solutions to resource allocation in several important cognitive radio-based networks, including a cogni- tive radio-basedopportunisticspectrum access network, a cognitiveradio-basedcen- tralized network, a cognitive radio-based cellular network, a cognitive radio-based high-speed vehicle network, and a cognitive radio-based smart grid.
標(biāo)簽： cognitive Networks Radio
上傳時(shí)間： 2020-06-07
上傳用戶：shancjb
隨著人們對(duì)于高速無(wú)線數(shù)據(jù)業(yè)務(wù)的急切需求以及新的無(wú)線通信技術(shù)的發(fā)展，頻譜資源匱乏問(wèn)題日益嚴(yán)重。無(wú)線頻譜的緊缺已經(jīng)成為限制無(wú)線通信與服務(wù)應(yīng)用持續(xù)發(fā)展的瓶頸。認(rèn)知無(wú)線電技術(shù)(cognitive Radio)改變了傳統(tǒng)的固定頻譜分配方式，它以頻譜利用的高效性為目標(biāo)，允許非授權(quán)用戶擇機(jī)利用授權(quán)用戶的頻譜空洞傳輸數(shù)據(jù)，以此來(lái)解決無(wú)線頻譜資源短缺的問(wèn)題。它是具有自主尋找和使用空閑頻譜資源能力的智能無(wú)線電技術(shù)。本文的目標(biāo)是在基于FPGA+DSP的系統(tǒng)硬件平臺(tái)上，以軟件編程的方式實(shí)現(xiàn)認(rèn)知無(wú)線電數(shù)據(jù)傳輸?shù)墓δ堋?軟件無(wú)線電是實(shí)現(xiàn)認(rèn)知無(wú)線電的理想平臺(tái)。本文首先闡述了軟件無(wú)線電的基本工作原理及關(guān)鍵技術(shù)途徑，對(duì)多速率信號(hào)處理中的內(nèi)插和抽取、帶通采樣、數(shù)字下變頻、濾波等技術(shù)進(jìn)行了分析與探討，為設(shè)計(jì)多速率調(diào)制解調(diào)系統(tǒng)提供了理論基礎(chǔ)。然后針對(duì)軟件無(wú)線電的要求給出了基于FPFA+DSP的系統(tǒng)設(shè)計(jì)硬件框圖，并對(duì)其中的部分硬件(FPGA、AD9857、AD9235)做了簡(jiǎn)要的描述并給出其初始化過(guò)程。在理解基本概念和原理的基礎(chǔ)上，詳細(xì)論述了在系統(tǒng)硬件設(shè)計(jì)平臺(tái)上實(shí)現(xiàn)的π/4-DQPSK、8PSK、16QAM調(diào)制解調(diào)技術(shù)。本文給出了調(diào)制解調(diào)系統(tǒng)實(shí)現(xiàn)方案中的各個(gè)功能模塊(差分編、解碼，加同步頭、內(nèi)插和成形濾波，下變頻，系統(tǒng)同步等)具體的設(shè)計(jì)方案和通過(guò)硬件編程實(shí)現(xiàn)了板級(jí)的仿真和最后的硬件實(shí)現(xiàn)，并對(duì)其中得到的數(shù)據(jù)進(jìn)行分析，進(jìn)一步驗(yàn)證方案的可行性。最后介紹了通信板同頻譜感知板協(xié)同工作原理，依據(jù)頻譜感知板獲取的各個(gè)信道狀況自適應(yīng)的選擇π/4-DQPSK、8PSK、16QAM調(diào)制解調(diào)方式并在FPGA上實(shí)現(xiàn)了其中部分功能。
標(biāo)簽： FPGA 多速率 調(diào)制解調(diào)器
上傳時(shí)間： 2013-05-30
上傳用戶：fywz
·認(rèn)知無(wú)線電原理與應(yīng)用 北京郵電大學(xué)出版社 高清PDF內(nèi)容簡(jiǎn)介近幾年來(lái)，國(guó)際學(xué)術(shù)界和IEEE標(biāo)準(zhǔn)化組織愈來(lái)愈對(duì)認(rèn)知無(wú)線電（cognitive Radio，CR）技術(shù)感興趣，稱其為未來(lái)無(wú)線通信領(lǐng)域的“下一個(gè)大事件”（Next Big了hing）。本書(shū)通過(guò)5章內(nèi)容來(lái)闡述認(rèn)知無(wú)線電及實(shí)現(xiàn)認(rèn)知無(wú)線電的代表性技術(shù)途徑，介紹超寬帶認(rèn)知無(wú)線電和IEEE 802.22標(biāo)準(zhǔn)。第1章主要介紹Mitola提出的認(rèn)知無(wú)線電
標(biāo)簽： 認(rèn)知無(wú)線電
上傳時(shí)間： 2013-06-19
上傳用戶：prczsf
In this paper, we describe the development of a mobile butterfly-watching learning (BWL) system to realize outdoor independent learning for mobile learners. The mobile butterfly-watching learning system was designed in a wireless mobile ad-hoc learning environment. This is first result to provide a cognitive tool with supporting the independent learning by applying PDA with wireless communication technology to extend learning outside of the classroom. Independent learning consists of self-selection, self-determination, self-modification, and self-checking.
標(biāo)簽： butterfly-watching development describe learning
上傳時(shí)間： 2014-11-26
上傳用戶：waizhang
認(rèn)知無(wú)線電一些參考資料，很有借鑒價(jià)值。 cognitive radio
標(biāo)簽： 認(rèn)知無(wú)線電 參考資料
上傳時(shí)間： 2014-01-01
上傳用戶：playboys0
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