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DVB
- 通过分析8PSK 调制方式的载波恢复、定时恢复算法, 提出了一种适用于新一代数字卫星电视标准DVB S2 的全数字解调算法, 改进了相位频率检测( PFD) 算法以适合于8PSK 解调. 载波恢复采用频率检测( FD) 和相位频率 检测相结合的结构, 跟踪范围超过1 倍符号率. 采用Gardner TED 算法进行定时恢复.-By analyzing the 8PSK modulation carrier recovery, timing recovery algori
RIL_design
- 目前的智能机在硬件上多采用双cpu的架构，一个是基带处理器，主要处理数字信号、语音信号的编码解码以及GSM通信协议，另一个是应用处理器，运行操作系统和各种应用程序。基带处理器、射频和其它外围芯片作为一个模块，成为GSM/GPRS modem，提供AT命令接口。网络的应用已经是一个需求的热点，而目前的GSM模块大多都能支持GPRS功能。应用处理器通过AT命令集与带GPRS功能的无线通讯模块通信，为实现网络的应用提供了一个最底层的支持。 -Intelligent machines in the
ddc
- Digital down-converters (DDC) are a key component for digital radio. The DDC performs the critical frequency translation needed to recover the information from a digitized modulated signal.
qam8_nograycode
- An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver. QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single chan
20070823003
- 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
shumaguan
- 单片机C语言程序设计实训之数码管显示的频率计-Digital display of frequency counter
2DPSK
- 设计一个2DPSK数字调制系统，要求： （1）设计出规定的数字通信系统的结构； （2）根据通信原理，设计出各个模块的参数（例如码速率，滤波器的截止频率等）； （3）用Matlab或SystemView 实现该数字通信系统； （4）观察仿真并进行波形分析； （5）系统的性能评价。 -Design a 2DPSK digital modulation system requirements: (1) design a digital communication sys
DPLL
- 数字锁相环频率合成器的设计,鉴相器、环路滤波器、数控振荡器、反馈分频器-Digital PLL frequency synthesizer, phase detector, loop filter, NCO, feedback divider
asd
- 航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控，其中以四相移相键控和八相移相键控调制方法的效率较高-Aerospace communications technology commonly used analog communication of frequen
A04
- HART协议采用基于Bell202标准的FSK频移键控信号，在低频的4-20mA模拟信号上叠加幅度为0.5mA的音频数字信号进行双向数字通讯，数据传输率为-The HART protocol uses frequency shift keying signal, FSK-based standard Bell202 0.5mA audio digital signal superimposed on the low frequency of 4-20mA analog signal amplit
carrier-frequency-capture
- 该文采用数字科斯塔斯环并结合数字匹配滤波辅助捕获的方法对T DRSS 中的大多普勒频移进行捕获和消除, 解决了大多普勒情况下载波恢复的难题, 为工程实践提供了一种新思路。-In this paper, using a digital Costas loop in combination with the digital matched filtering auxiliary capture the T-DRSS large Doppler frequency shift to capture a
MATLAB-a-Simulink-for-Digital-Communication
- Every thing about MIMO system and OFDM, including Matlab source, timing, frequency synchronization, equalization, estimation, PAPR, space time block code, channel capacity
digital-filter
- 本作品是由前置放大、带阻网络、数字幅频均衡和低频功率放大电路组成的数字幅频均衡功率放大器。总体方案以LM386为核心实现了前置放大功能，对放大后的输入信号通过AIC23B进行A/D采样后，用TMSC5402 DSP对采集来的信号进行处理，实现了数字幅频均衡，最后以2SC3281为核心实现了信号的低频功率放大。-This work by the pre-amplifier, band-stop networking, digital amplitude-frequency balanced and
Analysis-and-Simulation-of-a-Digital-Mobile-Chann
- Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing
Digital-Modulation-Fundamentals
- This tutorial is part of the National Instruments Measurement Fundamentals series. Each tutorial in this series teaches you a specific topic of common measurement applications, by explaining the theory and giving practical examples. This tutorial c
Communication-system-simulation
- 了解差分编码及译码的电路组成、工作原理和特点； 了解并串，串并变换的电路组成，工作原理和特点； 了解数字频带传输系统的电路组成，工作原理和特点； 了解数字频带传输系统的性能分析方法； -Understand the difference circuit of coding and decoding of the composition, working principle and characteristics Understanding and string, strin
6-Digital-Predistortion-for-Power-Amplifiers-with
- Power amplifier is essential component in communication systems and it’s inherently nonlinear. This essay mainly investigate a based on Hammerstein predistorter , a memory polynomial predistorter. The Hammerstein predistorter is designed spec
Digital-Clock-Recovery-Algorithm-for-Optical-Cohe
- We propose a digital clock recovery algorithm and demonstrate its tolerance to at least 5GHz laser frequency mismatch in a 43Gb/s DP-RZ-QPSK receiver after 1200km transmission.- We propose a digital clock recovery algorithm and demonstrat
match_filter_design
- 基于MATLAB的匹配滤波器住址设计，实际应用是对信号处理中的数字下变频和脉冲压缩处理的设计仿真-The address of the matched filter design based on MATLAB, the actual application is under the signal processing of digital frequency conversion and the design of the pulse compression processing simula
一种QPSK全数字化载波频偏估计算法
- 信号利用QPSK调制，采用全数字化的频偏估计方法(A full digital frequency offset estimation method using QPSK modulation)