扩频

基于DSP和FPGA的嵌入式数字直接序列扩频系统的研制

Design of an Embedded Digital DSSS System Based on DSP and FPGA

直接序列扩频系统抗同频干扰的MATLAB仿真

Simulation of DSSS System with Co-Channel Interference by MATLAB

理论研究结果表明：此方案对高速扩频通信系统的解扩解调是行之有效的

Research results showed that this new scheme is very valid for bespeaking and demodulating M-ary communication .

TCM正交序列扩频多址通信系统性能分析

Performance Analysis of TCM Orthogonal Sequences Spread Spectrum Multiple-Access Communication System

基于USB接口的电力线扩频载波通信系统研究

The Study of Power Line Communication System Based on USB Interface

测风采用GPS扩频技术，大幅度提高测风数据获取率。

By means of GPS frequency-extending technology , RS92 's wind data acquirability is greatly improved .

基于FPGA的位移序列多进制扩频系统的仿真研究

Study on Numeral Simulation based on FPGA of The Displacement Sequence M-ary Spread Spectrum System

mW复合序列在扩频通信中抗远近效应的应用

Implementation of resisting near-far effects of MW composite sequence in spread spectrum system

时变信道中CDMA信号的波达方向和直接扩频序列盲估计

Blind Estimation of DOA and Direct Sequence for CDMA Signals in Time-Varying Channel

由FPGA对信号进行纠错编码和扩频编码。

Carries on the error correction code and the wide frequency code by FPGA to the signal .

PN码捕获是扩频通信系统中的一个基本的、重要的问题。

Code acquisition is an important and radical problem in spread communication systems .

数字差分BPSK扩频接收机的设计与FPGA实现

Design and FPGA Implementation of Digital Differential BPSK DSSS Receiver

扩频系统中PN码平方律捕获检测性能的闭合形式统计分析

Closed-form statistical analysis for square law PN acquisition detector performance in spread spectrum systems

仿真结果表明，这种方法可以有效地消除大Doppler频移的影响，迅速完成扩频码的捕获。

Simulation results show that the new method eliminates the influence of large Doppler shifts effectively , with fast acquisition time .

在理想情况下，CDMA通信系统中使用的扩频序列集中：每个扩频序列的自相关函数应该是一个冲激函数，即除零时延外，其值应处处为零；

Ideal spreading codes used for CDMA system should have impulsive-like auto-correlation functions and zero cross-correlation functions .

WCDMA系统中正交可变扩频码的混合分配算法

Hybrid Allocation Algorithm of Orthogonal Variable-Spreading-Factor Codes for WCDMA

第二章首先介绍了自适应阵列的系统模型及本文研究所采用的自适应算法，然后简单介绍了扩频系统的原理和动态实时仿真系统SYSTEMVIEW。

In Chapter Two we describe an adaptive array system model and the algorithm we used in this thesis , then introduce the principle of Spread Spectrum system and dynamic simulation tool System View in brief .

提出了一种可以在多径环境下消除CDMA多址干扰的新扩频方案。

A new spreading scheme is introduced for nullifying the multi-access interference ( MAI ) for CDMA systems .

针对专用网络运行过程中光监控通路出现的问题，论文提出了基于DSP的扩频方案。

In order to deal with some questions in the optical supervisory channel while running , a scheme based on DSP is proposed .

最后，本文对扩频码分多址（CDMA）通信技术在无线DCS中的应用进行了展望。

At last , this paper gain a perspective on the progress of the wireless DCS based on CDMA .

具有优良伪随机特性和较大线性复杂度的伪随机序列广泛应用于CDMA扩频通信和密码学中。

Sequences with good pseudorandom properties and large linear span are widely used in the CDMA spread spectrum communication and cryptography .

传统的扩频通信广泛采用伪噪声（Pseudo-Noise，PN）序列作为扩频序列，PN序列具有类噪声特性，但它实际上是确定的周期序列，容易被复制。

Traditional Spread Spectrum Communication adopts Pseudo-Noise ( PN ) codes as spreading codes .

在CDMA移动通信系统的反向信道中，由于用户间扩频码不严格正交，多个用户之间会产生多址干扰，导致性能的恶化。

In the reverse channel of CDMA mobile multi-user systems , the performance suffers from the multiple access interference ( MAI ) .

在PLC中采用了各种不同的调制技术（FSK、扩频通信和OFDM）来克服这些不利因素，本文对它们的工作原理和特点进行了探讨。

To overcome these adverse factors , we adopt various modulation techniques ( FSK , Spread spectrum communication and OFDM ) .

具高可读性的Cohen类时频分布及其在扩频通信中的应用

Cohen Class TFD with High Readability and Its Using in Spread Spectrum Communication Systems

多载波CDMA技术是是近年来通信界研究的热点问题，他将扩频多址技术与多载波技术有机的集合起来。

Multicarrier CDMA is the combination of spread spectrum technique and multicarrier technique , being focused on in communication field in these years .

用声表面波器件对MSK扩频信号进行非相干解调

Non-Coherent Demodulation of Spread Spectrum MSK Signal by SAW Device

基于广义Chirplike序列族，用序列乘积的方法，构造了一类新型扩频序列族，并讨论了它的相关特性。

Based on the generalized Chirp-like sequences , a new class of spreading sequences was constructed with the help of the product technique and its correlation properties were discussed .

由于PN序列具有类噪声特点，使得扩频通信具有抗噪声、抗干扰、保密性能好等优点。

The spread spectrum communication has advantages of anti-noise , anti-interaction and nice secrecy for the noise characteristic of PN sequence .

提出一种应用于非周期扩频的CDMA系统下行信道的分数阶间隔信道估计算法，以及在信道估计结果基础上得到的均衡算法。

In the paper , fractionally spaced channel estimation and equalization algorithms are proposed for a synchronous CDMA system that uses aperiodic spreading code .