In the nineteenth century, scientists, mathematician, engineers and innovators started investigating electromagnetism. The theory that underpins wireless communications was formed by Maxwell. Early demonstrations took place by Hertz, Tesla and others. Marconi demonstrated the first wireless transmission. Since then, the range of applications has expanded at an immense rate, together with the underpinning technology. The rate of development has been incredible and today the level of technical and commercial maturity is very high. This success would not have been possible without understanding radio- wave propagation. This knowledge enables us to design successful systems and networks, together with waveforms, antennal and transceiver architectures. The radio channel is the cornerstone to the operation of any wireless system.
標(biāo)簽： LTE-Advanced Generation Next and
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
MIMO-OFDM is a key technology for next-Generation cellular communications (3GPP-LTE, Mobile WiMAX, IMT-Advanced) as well as wireless LAN (IEEE 802.11a, IEEE 802.11n), wireless PAN (MB-OFDM), and broadcasting (DAB, DVB, DMB). This book provides a comprehensive introduction to the basic theory and practice of wireless channel modeling, OFDM, and MIMO, with MATLAB ? programs to simulate the underlying techniques on MIMO-OFDMsystems.Thisbookisprimarilydesignedforengineersandresearcherswhoare interested in learning various MIMO-OFDM techniques and applying them to wireless communications.
標(biāo)簽： Communications MIMO-OFDM Wireless MATLAB with
上傳時(shí)間： 2020-05-28
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(shí)間： 2020-05-31
上傳用戶：shancjb
Mobile wireless communications are in constant evolution due to the continu- ously increasing requirements and expectations of both users and operators. Mass multimedia* services have been for a long time expected to generate a large amount of data traffic in future wireless networks [1]. Mass multimedia services are, by definition, purposed for many people. In general, it can be distinguished between the distribution of any popular content over a wide area and the distribu- tion of location-dependent information in highly populated areas. Representative examples include the delivery of live video streaming content (like sports compe- titions, concerts, or news) and file download (multimedia clips, digital newspa- pers, or software updates).
標(biāo)簽： Broadcasting Generation Mobile Next
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
Never have telecommunications operations and network management been so important. Never has it been more important to move away from practices that date back to the very beginning of the telecommunications industry. Building and con- necting systems internally at low cost, on an as - needed basis, and adding software for supporting new networks and services without an overall architectural design will not be cost effective for the future. Defi ning operations and network manage- ment requirements at the 11th hour for new technologies, networks, and services deployments must also change.
標(biāo)簽： Telecommunications Generation Networks Next
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
In the past few decades, a technological revolution has occurred that has changed the way we live in dramatic ways. This technological revolution is the result of the emergence and evolution of a wide variety of new wireless networking tech- nologies. Now people using these technologies are able to access the network and control many applications at will with their handheld devices anywhere, anytime. Although these technologies have made a long lasting impact in the revolution, it has also opened up various challenging issues which are yet to be resolved to make them more efficient and cost-effective.
標(biāo)簽： next-Generation Technologies Wireless
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
This chapter provides extensive coverage of existing mobile wireless technologies. Much of the emphasis is on the highly anticipated 3G cellular networks and widely deployed wireless local area networks (LANs), as the next-Generation smart phones are likely to offer at least these two types of connectivity. Other wireless technologies that either have already been commercialized or are undergoing active research and standardization are introduced as well. Because standardization plays a crucial role in developing a new technology and a market, throughout the discussion standards organizations and industry forums or consortiums of some technologies are introduced. In addition, the last section of this chapter presents a list of standards in the wireless arena.
標(biāo)簽： Networking Wireless Complete
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
Springer模擬電路設(shè)計(jì)叢書，《清華版雙語教學(xué)用書·模擬集成電路設(shè)計(jì)精粹》作者首先對(duì)MOST和BJT兩種器件模型進(jìn)行了分析和比較，然后以此為兩條線索，分別介紹了相應(yīng)的基本單元電路和各類放大器的詳細(xì)分析，隨后的章節(jié)分別研究噪聲、失真、濾波器、ADC／DAC和振蕩器電路，每一章都結(jié)合MOST和BJT兩種類型電路進(jìn)行分析比較。《清華版雙語教學(xué)用書·模擬集成電路設(shè)計(jì)精粹》一方面?zhèn)戎赜诨A(chǔ)知識(shí)，對(duì)模擬和混合信號(hào)集成電路中的許多重要概念以直觀形象的語言進(jìn)行了描述。另一方面又側(cè)重介紹與現(xiàn)代集成電路工藝相關(guān)的最新電路的研究方向和熱點(diǎn)。next-Generation ADCs, High-Performance Power Management, and Technology Considerations for Advanced Integrated Circuits
上傳時(shí)間： 2022-04-19
上傳用戶：
The GD32F103xx device is a 32-bit general-purpose microcontroller based on the ARM?Cortex?-M3 RISC core with best ratio in terms of processing power, reduced power consumption and peripheral set. The Cortex?-M3 is a next generation processor core whichis tightly coupled with a Nested Vectored Interrupt Controller (NVIC), SysTick timer and advanced debug support.The GD32F103xx device incorporates the ARM ' Cortex?-M3 32-bit processor core operating at 108 MHz frequency with Flash accesses zero wait states to obtain maximumefficiency. It provides up to 3 MB on-chip Flash memory and up to 96 KB SRAM memory. An extensive range of enhanced I/Os and peripherals connected to two APB buses. The devices offer up to three 12-bit ADCs, up to two 12-bit DACs, up to ten general-purpose
標(biāo)簽： gd32f103
上傳時(shí)間： 2022-07-23
上傳用戶：aben
Generating next numbers in SQLServer should not be a problem. But problems arise when a customer asks for different types of next numbers that you cannot generate directly from SQL Server. This brief article describes how you would tackle this problem in different scenarios.
標(biāo)簽： Generating SQLServer customer problems
上傳時(shí)間： 2015-01-11
上傳用戶：as275944189
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