基于MTK7612/7628D的wifi2.4g和5G开发资料AP-MT7628_IPAILNA_MT7612E_IPAILNA_V18_2L_SPI_DDR2_COCLOCK_WS3050_20150224.pdf
上传时间： 2022-07-04
上传用户：xsr1983
SPI方式STM32F103与2.4g模块NRF24L01收发通讯
标签： spi stm32f103 nrf24l01 收发通讯
上传时间： 2022-07-05
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PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4g broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4g. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上传时间： 2022-07-08
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2.4g小车遥控智能小车设计资料，包括遥控器资料，可移植添加重力感应功能
上传时间： 2022-07-10
上传用户：jason_vip1
2.4g nRF24L01测试板原理图和PCB源文件
上传时间： 2022-07-10
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联发科MTK MT6735全模4g智能手机资料分享(原理图和PCB).
上传时间： 2022-07-10
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XN297L-2.4g无线收发模块-原理图PCBXN297驱动源码
上传时间： 2022-07-10
上传用户：1208020161
STM32407 USB驱动4g模块代码
上传时间： 2022-07-22
上传用户：shjgzh
这是在网上找的关于2.4g天线的设计方法，对于在设计2.4g天线的同事应该有点帮助
上传时间： 2013-06-16
上传用户：古谷仁美
当今，移动通信正处于向第四代通信系统发展的阶段，OFDM技术作为第四代数字移动通信(4g)系统的关键技术之一，被包括LTE在内的众多准4g协议所采用。IDFT/DFT作为OFDM系统中的关键功能模块，其精度对基带解调性能产生着重大的影响，尤其对LTE上行所采用的SC_FDMA更是如此。为了使定点化IDFT/DFT达到较好的性能，本文采用数字自动增益控制(DAGC)技术，以解决过大输入信号动态范围所造成的IDFT/DFT输出信噪比(SNR)恶化问题。 首先，本文简单介绍了较为成熟的AAGC(模拟AGC)技术，并重点关注近年来为了改善其性能而兴起的数字化AGC技术，它们主要用于压缩ADC输入动态范围以防止其饱和。针对基带处理中具有累加特性的定点化IDFT/DFT技术，进一步分析了AAGC技术和基带DAGC在实施对象，实现方法等上的异同点，指出了基带DAGC的必要性。 其次，根据LTE协议，搭建了从调制到解调的基带PUSCH处理链路，并针对基于DFT的信道估计方法的缺点，使用简单的两点替换实现了优化，通过高斯信道下的MATLAB仿真，证明其可以达到理想效果。仿真结果还表明，在不考虑同步问题的高斯信道下，本文所搭建的基带处理链路，采用64QAM进行调制，也能达到在SNR高于17dB时，硬判译码结果为极低误码率(BER)的效果。 再次，在所搭建链路的基础上，通过理论分析和MATLAB仿真，证明了包括时域和频域DAGC在内的基带DAGC具有稳定接收链路解调性能的作用。同时，通过对几种DAGC算法的比较后，得到的一套适用于实现的基带DAGC算法，可以使IDFT/DFT的输出SNR处于最佳范围，从而满足LTE系统基带解调的要求。针对时域和频域DAGC的差异，分别选定移位和加法，以及查表的方式进行基带DAGC算法的实现。 最后，本文对选定的基带DAGC算法进行了FPGA设计，仿真、综合和上板结果说明，时域和频域DAGC实现方法占用资源较少，容易进行集成，能够达到的最高工作频率较高，完全满足基带处理的速率要求，可以流水处理每一个IQ数据，使之满足基带解调性能。
上传时间： 2013-05-17
上传用户：laozhanshi111
