本文介绍了基于SDR（软件无线电）的新一代卫星宽带解调器，它由CPCI刀片工控服务器、2块中频变频采集卡及4块解调译码卡组成，本文介绍了其基本原理、结构组成、性能参数，阐述了各板卡的具体设计与实现，并给出了部分性能仿真，最后介绍了实现时的技术难点。
The main idea of SDR is to construt an open and modularized general platform,to carry out all kinds of functions with software,and locate the wideband A/D nearest from the antenna.In this paper,a new kind of satellite wideband demodulator based on SDR,is introduced,which consists of CPCI slice industrial server,2 cards for intermediate frequency convertion and sampletion and 4 cards for demodulation and decoding. The paper still introduces the fundamental,construction and performance parameter of the demodulator,specifies the design and implement of the cards,and provides several simulations.At last,the difficulties is discussed. (2010-12-22, WORD, 271KB, 下载11次)
自动识别系统电台的卞要功能是在接收状态将接收到的射频信号解调成高斯最小频移键控(GMSI})比特流以供信号处理板使用 而在发射状态则将来自处理板的9.6 kbps的GMSI}比特流调制成适合发射的射频信号并发射。木电台使用半双工方式工作，共用一副大线，其中发射通路只有一个通道，但可通过微处理器改变调制芯片LMX1501的内部设置数以产生两个频率，然后再经过卜变频得到中心频率分别为162.025 MHz和161.975 MHz的发射信号 木电台的接收则分为二路，其解调芯片都是用TA31136来实现的，其中两路用来接收中心频率分别为162.025 MHz和161.975 MHz信号，另一路用来接收数字呼n}}信号，中心频率为156.025 MHz。二个通路的结构、工作原理和使用的器件都基木相同。
Bian automatic identification system stations to function in the receiving state will receive the RF signal demodulation into a Gaussian Minimum Shift Keying (GMSI)) bit stream for the signal processing board used while the state will launch from the processing board The GMSI) of 9.6 kbps bit stream into a modulated RF signals suitable for launch and launch. Wood work station using the half-duplex mode, sharing one big line, which launched only one channel path, but can be modulated by changing the microprocessor chip LMX1501 number of internal settings to produce two frequencies, and then get through the BU center frequency of inverter for 162.025 MHz and 161.975 MHz transmit signal wooden radio receiver is split Road, its demodulator chips are used to achieve TA31136, in which two-way center frequencies were used to receive 162.025 MHz and 161.975 MHz signal, the other all the way to receive digital calls n)) signal, the center frequency of 156.025 MHz. 2 channel structure, working (2010-03-08, WORD, 12KB, 下载6次)
本论文从TH-UWB的信号结构特点出发，分析了TH-UWB系统多址干扰与
CDMA系统多址干扰的不同特点，提出了多个低复杂度的多用户检测器。
In this paper, from the TH-UWB signal structure characteristics of an analysis of TH-UWB system with multiple access interference
CDMA systems multiple access interference of the different characteristics of a number of low-complexity multi-user detector. (2009-06-05, WORD, 1071KB, 下载34次)
设有一十字路口，其道路为南北方向和东西方向，南、北、东、西各用一组发光二极管表示。此路口交通信号灯的亮灭规律如下： 1） 正常情况下，两路轮流放行。信号转换时，按照一下规律显示： 纵向与横向的交通灯定时60秒交换红绿色一次，剩余时间在数码管上显示。 灯光有三种颜色：红、黄、绿。每次交换时要求在黄色灯停留3秒钟。 两路的现实必须保证它们是交叉进行的。 2） 当路上出现特种车辆（如警车、消防车、救护车等）通过时，四边街口均显示红灯，以便只允许紧急车辆通过。其他车辆暂停行驶，特种车辆过后自动恢复原来的灯色标志。 3）有提前换灯信号功能，即一路的车辆能够申请另一路中断绿灯而让其通行。不过这是有条件的，即必须是被请求的一路已有6秒钟无车通过才会响应；硬件电路设置为IRQ1实现。 说明，所需的时间必须通过8253定时器取得；使用8259中断模拟特种车 (2008-07-09, WORD, 4KB, 下载7次)
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