Description: Carrier-phase synchronization can be approached in a
general manner by estimating the multiplicative distortion (MD) to which
a baseband received signal in an RF or coherent optical transmission
system is subjected. This paper presents a unified modeling and
estimation of the MD in finite-alphabet digital communication systems. A
simple form of MD is the camer phase exp GO) which has to be estimated
and compensated for in a coherent receiver. A more general case with
fading must, however, allow for amplitude as well as phase variations of
the MD.
We assume a state-variable model for the MD and generally obtain a
nonlinear estimation problem with additional randomly-varying system
parameters such as received signal power, frequency offset, and Doppler
spread. An extended Kalman filter is then applied as a near-optimal
solution to the adaptive MD and channel parameter estimation problem.
Examples are given to show the use and some advantages of this scheme. Platform: |
Size: 827601 |
Author:吴大亨 |
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Description: Carrier-phase synchronization can be approached in a
general manner by estimating the multiplicative distortion (MD) to which
a baseband received signal in an RF or coherent optical transmission
system is subjected. This paper presents a unified modeling and
estimation of the MD in finite-alphabet digital communication systems. A
simple form of MD is the camer phase exp GO) which has to be estimated
and compensated for in a coherent receiver. A more general case with
fading must, however, allow for amplitude as well as phase variations of
the MD.
We assume a state-variable model for the MD and generally obtain a
nonlinear estimation problem with additional randomly-varying system
parameters such as received signal power, frequency offset, and Doppler
spread. An extended Kalman filter is then applied as a near-optimal
solution to the adaptive MD and channel parameter estimation problem.
Examples are given to show the use and some advantages of this scheme. Platform: |
Size: 827392 |
Author:吴大亨 |
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Description: GMSK基带系统仿真
本试验是用数字基带处理方法来实现调试期算法的基带硬件实验。
通过用软件matlab进行了GMSK相位路径和眼图的仿真,之后对任何一种五位随机码，每周期八次的任一抽样时刻，和任一相位区域(0、1、2、3)的任一组合，计算出相位 ，并对 以及 进行1024位的量化、编码成10位二进制码表。进一步利用matlab从上述的码表得出GMSK基带波形的眼图，和理论上计算的眼图比较，一致性很好。
-GMSK baseband system simulation is used in this test method to realize the digital baseband processor debugging phase algorithms with hardware-based experiments. By using the software matlab a GMSK phase path and the eye diagram of the simulation, after any one of five random code, eight times per cycle of any one sampling time, and any one-phase region (0,1,2,3) of any combination of one to calculate the phase, and 1024 as well as quantitative, encoded into a binary code table 10. Further use of matlab code from the above tables GMSK baseband waveform eye diagram and eye diagram theoretically compared to a good consistency. Platform: |
Size: 1024 |
Author:魏玉晗 |
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Description: GPS信号的基带处理在IEEE发表的文章有关信号捕获和跟踪的-GPS baseband signal in the IEEE published articles related to signal acquisition and tracking of Platform: |
Size: 354304 |
Author:刘旭东 |
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Description: .FSK、PSK、ASK调制原理 在数字通信系统中，数字基带信号通常要经过数字调制后再传输。常见的调制方式有频移键控（FSK）、相移键控（PSK）、幅移键控（ASK）-. FSK, PSK, ASK modulation principle in digital communication systems, digital baseband signal is usually subject to digital modulation and then transmitted. Common modulation methods are frequency-shift keying (FSK), phase shift keying (PSK), amplitude shift keying (ASK) Platform: |
Size: 157696 |
Author:xu |
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Description: In this simulink model , baseband binary detection is simulated .A rectangular pulse shaped signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The binary signal transmitted is recovered
at the detector output.-In this simulink model , baseband binary detection is simulated .A rectangular pulse shaped signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The binary signal transmitted is recovered
at the detector output. Platform: |
Size: 7168 |
Author:quail |
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Description: In this simulink model , baseband 8-ary PAM detection is simulated .A half-sine pulse shaped PAM signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset
can be seen by varying the phase of down-sampling
operation.The 8-ary PAM signal transmitted is recovered
at the detector output. Platform: |
Size: 8192 |
Author:quail |
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Description: 数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控。-Transmission of digital signals into base band transmission and band-pass transmission, in practice, most of the channel with band-pass characteristics can not directly transmit base-band signal. In order to make the digital signal is transmitted with a communication channel, you must use the digital baseband signal to modulate the carrier to make the signal to match the characteristics of the channel. The digital baseband signal control with a carrier, the digital baseband signal conversion to digital bandpass signal is called digital modulation. Keying method is commonly used digital modulation, such as on the carrier' s amplitude, frequency and phase shift keying. Platform: |
Size: 247808 |
Author:ZQ072027136 |
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Description: 本程序仿真CDMA2000的复扩频过程,只考虑导频信道和一个业务信道,假设同步已建立，接收端能产生同频同相相干载波,整个仿真过程在基带中进行.-The simulation program CDMA2000 complex spread spectrum, considering only the pilot channel and a business channel, and assume that synchronization has been established, the receiver can produce the same frequency and phase coherent carrier, the whole simulation process in the baseband Platform: |
Size: 3072 |
Author:小怪 |
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Description: 无线PPT遥控发送电路设计
这是一个2DPSK调制电路，2DPSK离不开二进制相移键控2PSK。
首先对二进制数字基带信号进行差分编码，将绝对码表示二进制信息变换为用相对码表示二进制信息，
然后再进行绝对调相，从而产生二进制差分相位键控信号.
-Wireless remote control PPT send circuit design
This is a 2 DPSK modulation circuit, 2 DPSK cannot leave the binary phase shift keying PSK 2.
First of all to the binary number baseband signal difference code. It will be absolutely code said information transform with the relatively for binary code said binary information,
And then the absolute phase-modulation, resulting in a binary differential phase keyed signal.
Platform: |
Size: 948224 |
Author: |
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Description: 该文提出一种基带GMSK 信号相关器，并从GMSK 解调信号的相位概率分布函数以及独立同分布随机变量和的概率分布函数出发，给出了该相关器的自相关峰和互相关峰的概率分布函数。从概率论与数理统计出发，
推导了一种统一的数字相关器(数字匹配滤波器)的自相关峰和互相关峰的概率分布函数。数值计算结果表明，在相同条件下，该基带GMSK 信号相关器的误检概率比数字相关器的低近一个数量级。-A type of baseband GMSK signal correlator is presented in this paper. From the phase probability
density function of demodulated GMSK signal and the probability distribution function of the sums of independent
identical distribution random variables, the auto-correlation and cross-correlation functions of the correlator are
proposed. A uniform auto-correlation and cross-correlation probability distribution functions of digital
correlator(digital matched filter) is derived from the probability and statistics theory. Numerical results
demonstrate that the error probability of the baseband GMSK signal correlator is about one order of magnitude
lower than that of digital one under the same condition. Platform: |
Size: 252928 |
Author:li |
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Description: 数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band transmission and band-pass transmission, in practical applications, most of the channel having a band pass characteristic but can not directly transmit baseband signal. In order to make the digital signal transmitted in band communication channel, the digital baseband signal modulates the carrier must be used, so that the signal with the characteristics of the channel to match. This control carrier of the digital baseband signal, the digital baseband signal is converted into digital the Bandpass process called digital modulation. Keying method generally used to implement the digital modulation, such as the carrier' s amplitude, frequency and phase shift keying Platform: |
Size: 74752 |
Author:zhujun |
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Description: 数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band transmission and band-pass transmission, in practical applications, most of the channel having a band pass characteristic but can not directly transmit baseband signal. In order to make the digital signal transmitted in band communication channel, the digital baseband signal modulates the carrier must be used, so that the signal with the characteristics of the channel to match. This control carrier of the digital baseband signal, the digital baseband signal is converted into digital the Bandpass process called digital modulation. Keying method generally used to implement the digital modulation, such as the carrier' s amplitude, frequency and phase shift keying Platform: |
Size: 376832 |
Author:zhujun |
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Description: VGA to PAL and NTSC converter...
This circuit is based on AD722 IC from Analog Devices. The AD722 is a low cost RGB to NTSC/PAL Encoder that converts red, green and blue color component signals into their corresponding luminance (baseband amplitude) and chrominance (subcarrier amplitude and phase) signals in accordance with either NTSC or PAL standards. These two outputs are also combined to provide composite video output. All the outputs can drive standard 75 ohm terminated video cables directly without extra amplifiers. The chip is a very compact solution, because operates from a single +5 V supply and it need no external delay lines or filters. Platform: |
Size: 145408 |
Author:kiam |
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Description: 在二进制数字调制中，当正弦载波的相位随二进制数字基带信号离散变化时，则产生二进制移相键控(2PSK)信号。 通常用已调信号载波的 0°和 180°分别表示二进制数字基带信号的 1 和 0，用matlab实现其功能。-In binary digital modulation, phase when the sine wave with the discrete binary digital baseband signal changes, then generates a binary phase shift keying (2PSK) signal. Usually expressed respectively 1 and 0 binary digital baseband signal with the modulated signal carrier of 0 ° and 180 °, to achieve its function with matlab. Platform: |
Size: 557056 |
Author:youhj |
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Description: 数字调制就是把数字基带信号的频谱搬移到高频处，形成适合在信道中传输的带通信号。基本的数字调制方式有振幅键控（ASK）、频移键控（FSK）、绝对相移键控（PSK）、相对（差分）相移键控（DPSK）。在接收端可以采用想干解调或非相干解调还原数字基带信号。
-Digital modulation is the spectrum shifting to high frequency digital baseband signals, suitable for the formation of bandpass signal transmission in the channel. Digital modulation basic amplitude keying (ASK), frequency shift keying (FSK), the absolute phase shift keying (PSK), relative (differential) phase shift keying (DPSK). At the receiving end can be used to dry the demodulation or non coherent demodulating the digital baseband signal.
Platform: |
Size: 92160 |
Author:曾福来 |
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Description: /* A C++ version of Matlab's qamdemod(y, M, varargin)
* Align each symbol to the nearest constellation points by minimum Euclidean distance.
* The function only consider rectanglular constellation diagram and grey code.
* The input is assumed to have been downconverted into baseband.
* I is the I component of phase and Q is the Q component of phase.
* The I and Q should be NxM or 1xM matrix/vector, in which the N indicate the subchannels and M indicates the symbols.
* The function treats each row as a subchannel and normalizes them respectively.
*/ Platform: |
Size: 1024 |
Author:EsonJohn |
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Description: 在实际的调谐解调电路中，采用的是非相干载波解调，本振信号与发射端的载波信号存在频率偏差和相位抖动，因而解调出来的模拟I、Q基带信号是带有载波误差的信号。这样的模拟基带信号即使采用定时准确的时钟进行取样判决，得到的数字信号也不是原来发射端的调制信号，误差的积累将导致抽样判决后的误码率增大，因此数字QPSK解调电路要对载波误差进行补偿，减少非相干载波解调带来的影响。(In the actual tuning and demodulating circuit, non-coherent carrier demodulation is adopted, and the frequency deviation and phase jitter of the local oscillator signal and the carrier signal of the transmitting end are present, and thus the demodulated analog I and Q baseband signals are signals with carrier error.) Platform: |
Size: 2048 |
Author:123qe |
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Search - phase in baseband