正交调制

基于DDS的任意频谱信号重构与数字正交调制方法

The Method of Reconstructing Optional Spectrum Signal and Digital Quadrature Modulation Based on DDS

FFT/IFFT处理器是OFDM系统中数据处理的核心单元，是OFDM系统中数据正交调制和解调的关键，FFT/IFFT处理器的设计直接决定着OFDM系统的性能。

FFT / IFFT processor is the core data processing unit and is the key to realize data quadrature modulation and demodulation in OFDM system . The design of FFT / IFFT processor directly determines the performance of the OFDM system .

基于FPGA的正交调制系统的研究与算法设计

Study of QPSK Modulation System Base on FPGA and Design of Arithmetic

一种新的GMSK正交调制信号产生方法

A New Method for Generating the Quadrature GMSK Signal

在此基础上，深入研究了导频辅助的相干Rake接收和M元正交调制的非相干Rake接收技术。

Based on the foundation , this paper go deep into researching the technology of pilot-aided coherent Rake reception and orthogonal M-ary non coherent Rake reception .

3，利用设计出的调制解调器与选定的AD、DA、正交调制解调芯片，完成了QPSK通信系统的硬件电路的设计并完成了调制电路的研制；

3 , With the FPGA for QPSK and the devices chosen for the system , the hardware of the system was designed and the hardware of the modulator was accomplished .

本文研究了基于光曼彻斯特数据编码及FSK标记方式的正交调制系统。

We study the performance of an orthogonal modulation system with frequency-shift keying ( FSK ) label and optical Manchester-coded ( MC ) payload .

正交调制部分采用误差调整与补偿电路，不仅稳定了直流偏置，而且还对信号进行了调理，从而有效控制了I，Q通道的幅相不一致性。

Stabilization of DC biasing , and signals deviation adjustment and compensation circuit are adopted in the quadrature modulator , so the problems on the incompatibility of channel I & Q in amplitude and phase are effectively solved .

本文提出了一种采用低速OC标签但不增加标签开销的相移键控光码（PSK-OC）标签和幅移键控（ASK）净荷正交调制光分组格式。

A scheme which adopts low chip-rate but no extra label length is proposed in this dissertation . The OC label is phase-shift keying ( PSK ) modulated on the amplitude-shift keying ( ASK ) modulation payload .

接着详细介绍了基于频率合成技术的线性调频源的基本理论，主要包括：DDS技术、锁相频率合成技术、正交调制技术、微波开关。

Secondly , The main theory of LFM synthesizer based frequency synthesis technology has been analyzed in detail , mainly including : DDS technology , PLL technology , Microwave switch and orthogonal modulation technology .

第二章从数字移动通信系统中常用的调制解调方式出发，比较了实现GMSK调制的几种方法，提出了波形存储正交调制实现GMSK调制的基本原理。

In chapter 2 , the principle of GMSK modulation is given in detail based on the discussion of various digital modulation techniques used in mobile communications .

提出了一种将正交调制LFM信号产生系统的幅相误差映射到基带后，在数字域利用复系数FIR滤波器进行校正的方案。

The amplitude and phase errors of the LFM signal generators using quadrature modulation technology are mapped into baseband . Then a method using complex coefficients FIR filters to calibrate the errors in digital domain is presented .

第三章介绍了基带调制信号与带通信号通过正交调制解调的数字上下变频技术；最后介绍FIR滤波器的特点与设计方法，并列举一个实例说明。

Chapter 3 introduces the digital up ( down ) conversion between baseband-modulated and bandpass modulated signal through orthogonal modulating ( demodulating ), At last , after discussing FIR filter 's properties and design methods , I give a design example .

通过分析协议中对调制参数的要求，本设计没有采用广泛应用的正交调制，而是采用成本更低可控增益放大器（VGA）芯片进行ASK调制取得了很好的调制效果。

Instead of using the method of the popular quadrature modulation , I adopt the lower cost controllable gain amplifier ( VGA ) chip for modulation after analyzing the requirements of modulation parameters in protocol , and we get the satisfied results .

本文详细介绍这项技术的发展历史以及与日前调频立体声的比较，并解释了调幅立体声中应用最广泛的美国MOTOROLA公司兼容正交调制（C&QuAM）的原理与发射系统。

This paper introduces history of this technique development in detail and in comparison with FM stereo now . The principle of compatible quadrature modutation ( C-QuAM ) of America Motorola Corporation is explained in the paper .

该方案利用CORDIC迭代运算产生数字基带线性调频信号，再通过正交调制和倍频技术拓展信号带宽，实现带宽满足UWB通信要求的Chirp-UWB信号。

The scheme uses CORDIC algorithm to generate digital baseband Chirp signal , and then though orthogonal modulation and frequency multiplication to expand the signal bandwidth , which satisfies UWB communication requirement .

结果表明，与二进制卷积码和Turbo码相比，非二进制双k码作为一种误比特率、计算量及译码时延的折衷方案，可以应用于正交调制系统。

The simulation results show that , compared with binary convolutional codes and Turbo codes , nonbinary dual-k codes can be regarded as a tradeoff among bit error rate ( BER ), computations and decoding time delay , and it can be applied to M-ary orthogonal modulation systems .

该试验板采用千兆比特光纤技术实现宽带数字T/R组件与雷达主机的数据传输，采用DDWS加正交调制技术产生宽带雷达信号，采用一片FPGA完成整个组件的控制。

It use Gigabit fiber components to transmit data between radar center and T / R module , use DDWS and quadrature modulate technology to generate wide band radar transmitting signal , all control signal is generated by FPGA .

分别实现了V.29信号基本调制解调过程，包括平方根升余弦滚降脉冲成形技术的滤波器实现，以及对信号的正交调制与解调过程。

Realizes V.29 signal basic modulate and demodulate procedure which includes square root raised cosine rolling-off shaping filter and orthogonal channel signal modulator and demodulator .

分析了两种基于DDWS技术合成中频信号的方法：基于中频采样的数字波形合成和基带数字波形合成+数字正交调制产生雷达信号的设计方案。

An analysis of two kinds of methods based DDWS techniques to synthesize IF signal : Digital waveform synthesis based on the IF sampling and base-band digital waveform synthesizer + digital quadrature modulation to generate radar signal via . 3 .

一种使用正交调制互补码的新方法

The new method using orthogonal complementary codes in radar system

本文进一步讨论了利用多项式函数进行三值扩频和正交调制的方法。

The methods of ternary spread spectrum and orthogonal modulation are discussed .

一种正交调制协作系统的功率分配方法

Optimal Power Allocation for Cooperative Systems Utilizing Quadrature Modulation

多进制伪码正交调制系统多址性能的改善

Improvement of Multi Address Performance in CDMA System with Multiple Orthogonal Signal Modulation

整个射频信号的合成则采用基带信号合成加正交调制的方式来完成。

RF signal is synthesized by the method of digital baseband signal and quadrature modulation .

编码M进制正交调制的性能评估

Performance evaluation of coded M-ary orthogonal modulation

因此这种正交调制光标记方案，将能进一步实现信号的高效传输。

Therefore , this orthogonal optical labeling scheme , will further realize efficient signal transmission .

正交调制过程的误差分析

An Error Analysis of the Quadrature Modulator

给出了包含正交调制和非正交调制的调制框架。

A framework of modulation methods which can cover orthogonal and non-orthogonal modulation methods is introduced .

正交调制实现窄带带通数字滤波器

Quadrature modulation implementing narrowband bandpass filtering