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[Program doc] nRF24L01P_Product_Specification_1_0 DL : 0: 单片2.4ghzISM频道2Mbps高速无线通信芯片nrf24l01+说明书-- Drop in compatible with the nRF24L01 - Worldwide 2.4GHz ISM band operation - Up to 2 Mbps on-air data rate - Ultra low power operation and advanced power management - 11.3mA peak TX current at 0dB output power - 13.5mA peak RX current at 2 Mbps air data rate - 900nA in power down mode - On chip voltage regulator, 1.9 to 3.6V supply range - Enhanced ShockBurstTM hardware link layer - Automatic packet assembly (Preamble, Address and CRC) - Dynamic payload length - Selective auto acknowledgment with payload - Auto retransmit - 6 data pipe MultiCeiverTM - Fully air compatible with Nordic nRF2401A, 02, E1 and E2 at 1 Mbps and 250 kbps air data rates - Low cost external ±60ppm 16MHz crystal - 5V tolerant inputs - Low cost chip inductors - Compact 20-pin 4x4mm QFN package
Date : 2025-12-25 Size : 968kb User : 张进
[Program doc] BlimpDuino_beta1.1.1 DL : 0: Blimpduino is a very low cost open source autonomous blimp. It consists of an Arduino-based blimp controller board with on-board infrared and ultrasonic sensors and an interface for an optional RC mode, a simple gondola with two vectoring (tilting) differential thrusters, and ground-based infrared beacon. It will be available as a commercial kit, complete with a mylar envelope, in late 2008.
Date : 2025-12-25 Size : 115kb User : marshallab
[Program doc] 4 DL : 0: ：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM 系统载频偏移估计的2 种算法，即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小，精度不高，而基于训练序列的算法有较高的估计精度，但降纸了系统传输效率。-Abstract：Carrier frequency ofset is one of the key problems in OFDM system．Two foundational methods 。cycling prefix—based and training sequence—based algorithms。to estimate OFDM carriers~equency ofset are analyzed．Then it discusses their basic thoughts。implementing methods and simulation resuits． Finally。merits and demerits of every algorithm are supposed．It concludes that the cycling prefix— based algorithm has less complexity and less precision。and that the training sequence—based algorithm has better estimation performance at the cost of transmission efficiency．
Date : 2025-12-25 Size : 163kb User : 卫海宁
[Program doc] 05441004 DL : 0: Multiple input multiple output techniques combined with orthogonal frequency division multiplexing (MIMO-OFDM) provide a promising approach for wireless systems. However, a serious drawback of the OFDM system is the high peak-toaverage power ratio (PAPR), which may severely affect the power efficiency of RF power amplifiers. In this paper, we propose a simple method to reduce the PAPR of MIMO-OFDM signals based on the use of unused subcarriers. Instead of processing the signals at each transmitter separately, a peak cancelling signal is generated at one antenna and is then applied to all the others with only simple modifications. Simulation has shown that a minimum 2 dB reduction in PAPR can be achieved for all transmit signals using this approach. As the signal processing is nearly all done at a single transmitter, repetition of the operations at each transmitter is avoided, and therefore the overall cost of the system can be significantly reduced.
Date : 2025-12-25 Size : 698kb User : payal
[Program doc] RFX2401 DL : 0: RFX2401一款高性能PA 用于蓝牙、WLAN、Zigbee和MIMO设计的两个高度集中单芯片及单芯片解决方案是首个RF前端集成电路(RFeICs)。RFX2401主要应用于蓝牙1级和单端口Zigbee。该芯片在BiCMOS器件中集成了功率放大器、LNA、发送和接收开关电路、相关匹配网络、以及谐波滤波器。前端的优越性能、高灵敏度和效率、低噪音、小型化和低成本使其非常适用于需要扩展范围和带宽的应用，这种扩散可能是10x的。RFX2401具有集成功率检测电路，只需一个外接电源电容器和用于TX-RX端口的带通滤波器。设计应用于802.11x和双端口Zigbee，工作频率为2.4 GHz.尤其适合单天线应用或作为MIMO应用的模块-RFX2401 a high-performance PA for bluetooth, WLAN, Zigbee and MIMO design of two highly centralized single chip and single chip solutions is the first RF front integrated circuit (RFeICs). RFX2401 mainly used in bluetooth grade 1 and single port Zigbee. The chip in BiCMOS device integration of power amplifiers, LNA, send and receive switch circuit, correlation matching network, and harmonic filter. The front end of the superior performance, high sensitivity and efficiency, low noise, miniaturization, and low cost that make it particularly applicable to need to expand the application range and bandwidth, this diffusion may be 10 x. RFX2401 has integrated power detection circuit, just a capacitor and external power supply for TX-RX port of bandpass filter. Design used in 802.11 x and dual port Zigbee, work for 2.4 GHz frequency, especially suitable for single antenna application or as a MIMO application ?
Date : 2025-12-25 Size : 302kb User : 粟学林
[Program doc] Network_Loadbalancing DL : 0: The project “NETWORK LOAD BALANCING” is designed using Microsoft Visual Studio.Net 2008 as front end and Microsoft SQL Server 2005 as back end which works in .Net framework version 2.0. The coding language used is VB .Net. Many distributed real-time applications, such as audio- and video-conferencing, require the network to construct a multicast path (tree) from a sender to multiple receivers. Furthermore, real-time applications have Quality-of-Service (QoS) requirements (e.g. bandwidth). The objective of the routing protocol is to build a tree that is both feasible (i.e. satisfies the requested QoS) and least costly. The cost of a tree depends on the costs of its links. The cost of a link should reflect the effect of allocating resources to the new connection on existing and future connections. Many studies have proposed multicast algorithms to construct low-cost QoS-constrained trees.-The project “NETWORK LOAD BALANCING” is designed using Microsoft Visual Studio.Net 2008 as front end and Microsoft SQL Server 2005 as back end which works in .Net framework version 2.0. The coding language used is VB .Net. Many distributed real-time applications, such as audio- and video-conferencing, require the network to construct a multicast path (tree) from a sender to multiple receivers. Furthermore, real-time applications have Quality-of-Service (QoS) requirements (e.g. bandwidth). The objective of the routing protocol is to build a tree that is both feasible (i.e. satisfies the requested QoS) and least costly. The cost of a tree depends on the costs of its links. The cost of a link should reflect the effect of allocating resources to the new connection on existing and future connections. Many studies have proposed multicast algorithms to construct low-cost QoS-constrained trees.
Date : 2025-12-25 Size : 548kb User : Starlin T S
[Program doc] cat6612 DL : 0: The CAT6612 is a high-performance and low-cost single channel HDMI transmitter, fully compliant with HDMI 1.2, HDCP 1.1 and backward compatible to DVI 1.0 specifications. The CAT6612 serves to provide the most cost-effective HDMI solution for DTV-ready consumer electronics such as settop boxes, DVD players and A/V receivers, as well as DTV-enriched PC products such as notebooks and desktops, without compromising the performance. Its backward compatibility to DVI standard allows connectivity to myriad video displays such as LCD and CRT monitors, in addition to the ever-so-flourishing flat panel TVs.
Date : 2025-12-25 Size : 594kb User : qokhan
[Program doc] CAN DL : 0: 作为一种技术先进、可靠性高、功能完善、成本合理的远程网络通讯控制方式，CAN-bus已被广泛应用到各个自动化控制系统中。例如，在汽车电子、自动控制、智能大厦、电力系统、安防监控等各领域，CAN-bus都具有不可比拟的优越性。-As a kind of advanced technology, high reliability, perfect function, reasonable cost of the remote network control mode, CAN-bus has been widely applied to various automation control system. For example, in the field of automotive electronics, automatic control, Intelligent Building, power system, security monitoring, CAN-bus has the incomparable superiority.
Date : 2025-12-25 Size : 248kb User : lioulis
[Program doc] Design-And-Simulation-Of-Qpsk-Modulator-For-Optic DL : 0: We have proposed a digitally implemented QPSK system for Free-Space Optics (FSO) systems for future satellite missions. We have used a Laser source of 1550nm wavelength and data rate of 2.5Gbps.The system consists of a modulating and a demodulating block and an advantage of filters added to improve the performance and optimize errors like noise. The best suited modulator for FSO is Mach-Zehnder modulator which is tuned for high performance. The LiNB03 demodulator demodulates the signal which in turn passed to a filter to attenuate the demodulated output and then through an amplifier to increase the signal strength. Digital approach for implementation of QPSK Modulation is attempted here and compared with existing systems. Simulation and characterization is done to freeze design parameters. The system mainly concentrates on parameter like performance, security, minimum size and cost saving which will be the future of satellite communications.
Date : 2025-12-25 Size : 437kb User : muhand