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Description: 直接序列扩频系统是在发端直接用具有高码率的扩频编码去扩展信号的频谱，而在收端用相同的扩频编码进行解扩使扩频信号还原为原始信号的一种扩频方式。直接序列系统中用的编码序列通常是伪随机序列或叫伪噪声（PN）码。要传送的信息经数字化后变成二元数字序列，它和伪随机序列模二相加(或相乘)后变成复合码去调制载波。在直接序列系统中通常对载波进行二进制相移键控调制(BPSK)。当扩频调制后由天线发射出去，在接收机中要有一个和发射机中的伪随机码同步的本地码，对接收信号进行解扩，解扩后的信号送到解调器取出传送的信息-direct sequence spread spectrum system is the originator directly with the high rate of spread spectrum signal coding to the expansion of the spectrum, and the resumption end with the same spread-spectrum coding for despreading spread spectrum signal so that the original signal reverted to a spread-spectrum approach. Direct-sequence system used in the coding sequence is usually pseudo-random sequence, or a pseudo-noise (PN) code. To the transmission of digital information by the following figures into binary sequence, it, and pseudo-random sequence-two together (or multiplication) into a composite code modulation to Carrier. In the direct-sequence system usually right carrier for binary phase shift keying modulation (BPSK). When spread spectrum modulation after the antenna launched, in the
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Size: 877 |
Author: 成兴 |
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Description: 这是基于小波变换的数字水印代码，在嵌入的水印加上一个pn尾随机序列-This is based on the wavelet transform digital watermark code, the embedded watermark with a random sequence late pn
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Size: 221935 |
Author: 符号 |
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Description: 这是基于小波变换的数字水印代码，在嵌入的水印加上一个pn尾随机序列-This is based on the wavelet transform digital watermark code, the embedded watermark with a random sequence late pn
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Size: 221184 |
Author: 符号 |
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Description: 直接序列扩频系统是在发端直接用具有高码率的扩频编码去扩展信号的频谱，而在收端用相同的扩频编码进行解扩使扩频信号还原为原始信号的一种扩频方式。直接序列系统中用的编码序列通常是伪随机序列或叫伪噪声（PN）码。要传送的信息经数字化后变成二元数字序列，它和伪随机序列模二相加(或相乘)后变成复合码去调制载波。在直接序列系统中通常对载波进行二进制相移键控调制(BPSK)。当扩频调制后由天线发射出去，在接收机中要有一个和发射机中的伪随机码同步的本地码，对接收信号进行解扩，解扩后的信号送到解调器取出传送的信息-direct sequence spread spectrum system is the originator directly with the high rate of spread spectrum signal coding to the expansion of the spectrum, and the resumption end with the same spread-spectrum coding for despreading spread spectrum signal so that the original signal reverted to a spread-spectrum approach. Direct-sequence system used in the coding sequence is usually pseudo-random sequence, or a pseudo-noise (PN) code. To the transmission of digital information by the following figures into binary sequence, it, and pseudo-random sequence-two together (or multiplication) into a composite code modulation to Carrier. In the direct-sequence system usually right carrier for binary phase shift keying modulation (BPSK). When spread spectrum modulation after the antenna launched, in the
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Size: 1024 |
Author: 成兴 |
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Description: 直接序列扩频通信中PN码同步技术的研究，对于研究伪随机序列和扩频通信的人很有帮助哦、-Direct sequence spread spectrum PN code synchronization communication technology, the study of pseudo-random sequence spread spectrum communication and people very helpful Oh,
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Size: 84992 |
Author: caidan |
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Description: CDMA网络规划基础 PN码规划和邻区的规划 解释了PN码(伪随机序列)以及CDMA网络中的邻区的概念以及基本的规划方法-CDMA network planning based on PN Code Planning and adjacent areas of planning explained the PN code (pseudo-random sequence), as well as CDMA networks the concept of adjacent areas, as well as basic planning methods
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Author: zhoukui |
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Description: 伪随机码或称PN码，是扩频通信中不可缺少的一种序列。扩频通信，简单的说来就是通过一组相关性很强的伪随机序列，使原有的信号按照伪随机序列的特性出现。从波形上看，原有信号完全淹没于随机的噪声中，达到隐藏信号和抗干扰的目的。接受方只要有相同的伪随机序列，就可以通过伪随机序列很强的相关性将信号还原出来。而m序列，是扩频系统中最长用的伪随机序列。下面的代码就是基于matlab的生成m序列的代码，通过改变初始多项式的值，就可以生成不同阶数的m序列。-Pseudo-random code or PN code, spread spectrum communication is indispensable to a sequence. Spread spectrum communication, a simple to say that the adoption of a group of highly related to pseudo-random sequence, so that the original signal in accordance with the characteristics of pseudo-random sequence there. From the wave point of view, the original signal completely submerged in the random noise to hide the purpose of signal and interference. As long as the recipient has the same pseudo-random sequence, the pseudo-random sequence can be a strong correlation to restore the signal out. And m sequence spread spectrum system is the longest of the pseudo-random sequence used. The following code is generated based on m sequences of matlab code, by changing the value of the initial polynomial, we can generate a different order of the m sequence.
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Author: fortunewjh0217 |
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Description: simulink做的BPSK的调制与解调，信号源是随机信号与PN码扩频调制，最后结果与随机信号比较一致-simulink do BPSK modulation and demodulation, the signal source is a random signal with the PN code spread-spectrum modulation, the final result more consistent with the random signal
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Size: 89088 |
Author: 张建云 |
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Description: 用遗传算法估计伪随机码（PN序列），包含初始化，选择，交叉，变异-Is estimated by using genetic algorithms pseudo-random code (PN sequence), including initialization, selection, crossover and mutation
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Size: 3072 |
Author: defang |
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Description: 语言：VHDL
功能：该PN4序列的特点为将一个4位序列的前两位取异或，再让序列左移一位，用异或的结果作为序列的最后一位。序列周期是15，即15位伪随机序列。其中包括序列的产生模块和检测模块。对于误码检测，首先捕获相位。然后，规定测试的码的总个数，统计这些码中有多少个不能满足PN序列特点的，用计数器统计个数。如果发现误码过多，可能是相位失调，重新捕获相位，再进行误码检测。
仿真工具：modelsim
综合工具：quartus -Language: VHDL
function: the sequence characteristics of the PN4 a 4-bit sequence of the first two to take different or, let a sequence of left, with the result as a sequence of different or the last one. Sequence cycle is 15, or 15-bit pseudo-random sequence. Including sequence generation module and detection module. For error detection, the first capture phase. Then, provided the total number of test code, statistics, the number of these codes can not meet the characteristics of PN sequences, with the number of counter statistics. If you find too many errors, it may be the phase offset, re-acquisition phase, then the error detection. Simulation tools: modelsim
synthesis tool: quartus II
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Author: huangjiaju |
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Description: 根据直扩原理，首先有随机数发生器产生一系列二进制信息数据（+1，-1），每个信息比特重复Lc次，Lc对应每个信息比特所包含的伪码片数，包含每一比特Lc次重复的序列与另一个随机数发生器产生的PN序列c(n)相乘。然后在该序列上叠加高斯白噪声和形式为i(n)=Acosw0n余弦干扰下次信号，切余弦干扰信号的振幅满足条件A<Lc。在解调器中进行与PN序列的互相关运算，并且将组成各信息比特的Lc个样本进行求和。加法器的输出送到判决器，将信号与门限值0进行比较，确定传送的数据为+1还是-1，计数器用来记录判决器的错判数目。-According to the principle, first some straight expansion random number generator produces a series of binary data (+ 1-1), each information bit repetitive Lc times, Lc for each information bit contains PN code piece count, embraces each bit Lc times repeated sequence and another random number generator produces PN sequence c (n) multiplication. Then in the sequence superimposed on gaussian white noise and forms as I (n) = Acosw0n cosine interference next time signal, cut cosine interfering signal amplitude satisfy conditions A < Lc. In the modem with the cross-correlation operation PN sequence, and the information will comprise the Lc a sample bits peace. The output of the adder judgment device, will signal to compare with threshold 0 data transmitted, determine for+ 1 or-1, counter is used to record the number victimised judgment.
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Author: 余甜 |
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Description: 伪随机码或称PN码，是扩频通信中不可缺少的一种序列。扩频通信，简单的说来就是通过一组相关性很强的伪随机序列，使原有的信号按照伪随机序列的特性出现。-Said pseudo-random code or PN code, spread spectrum communication is an indispensable sequence. Spectrum, simple to say is highly relevant by a group of pseudo-random sequence, so that the original signal in accordance with the characteristics of pseudo-random sequence appears.
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Author: 郭云 |
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Description: 随机产生m序列 即产生伪随机数 又叫做伪随机序列、伪噪声(PN)码或伪随机码。-M sequence that is randomly generated pseudo-random number generation, also known as pseudo-random sequence, a pseudo-noise (PN) code or pseudo-random code.
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Author: 陈真贺 |
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Description: 伪随机序列、伪噪声(PN)码或伪随机码。可以预先确定并且可以重复实现的序列称为确定序列；既不能预先确定又不能重复实现的序列称随机序列；不能预先确定但可以重复产生的序列称伪随机序列。-Pseudo-random sequence, a pseudo noise (PN) code, or pseudo-random code. The sequence is called to determine the sequence can be pre-determined and can be repeated to achieve neither a pre-determined sequence to said random sequence can not be repeated to achieve said pseudo-random sequence can repeat the sequence can not be determined in advance.
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Author: 衡昱帆 |
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Description: PN码同步仿真实验 伪随机序列 m序列的扩频仿真，里面有详细的参数设置，模块搭建-PN code synchronization simulation pseudo-random sequence of m-sequence spread spectrum simulation, which has detailed parameter settings, the module structures
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Size: 52224 |
Author: 胡凯 |
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Description: 利用扩展卡尔曼算法( EKF)对高动态直接扩频信号的载波相位和频率进行了估计,并利用载波辅助技术测量载波相位的变化值来
校正伪码延时环,减小多普勒频移对伪码延时的影响,得到了精确的延时估计值,提
高了伪码延时锁定环的动态跟踪性能.-The PN delay loop is adjusted through measuring the varied value of carrier phase with carrier aiding technology. The effect of Doppler shift on PN code delay is reduced through carrier aid-
ing technology. The precise delay estimation is obtained. The dynamic tracking performance of the PN delay loop is improved.
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Author: 李新一 |
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Description: 通信领域里的产生随机PN序列，QPSK调制解调的VHDL代码，适合通信领域的人士使用-Communication in the field of random PN sequence, QPSK modulation and demodulation of the VHDL code, those suitable for use in the field of communications
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Size: 2048 |
Author: 岳雨豪 |
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Description: 伪随机序列的产生，又称为PN码。本文件产生的为PN15，通式为X15+X14+1。-Generation of pseudo random sequences, also known as the PN code. This file is generated for the PN15, the general expression of X15+X14+1.
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Size: 1024 |
Author: kirin-Jen |
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Description: 基于matlab的直接序列扩频通信系统仿真。这种技术是将要发送的信息用伪随机码（PN码）扩展到一个很宽的频带上去，在接收端，用与发端扩展用的相同的伪随机码对接收到的扩频信号进行相关处理，恢复出发送的信息。-matlab direct sequence spread spectrum communication system based on. This technology is an extension of information to be transmitted with a pseudo-random code (PN code) to a wide frequency band up at the receiving end, with the spread spectrum signal with the originating extension with the same pseudo-random code of the received correlation processing recovers the transmitted information.
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Author: city |
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Description: 用伪随机序列PN码实现对通信中CDMA的仿真实验(Pseudo random sequence PN code to achieve the simulation of communication in CDMA experiment)
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Author: 豆豆171677821
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