正交幅度调制

正交幅度调制（QAM）在高能爆炸无线电遥测系统中的应用

Application of QAM in the High Explosive Radio Telemetry Project

对正交幅度调制提出了采用格状编码调制技术（TCM）的改进措施，并进行了相关理论分析，以克服PLC信道的噪声与衰减等不利因素，以及协调频带利用率与误码率之间的矛盾。

The TCM measures are taken to improve the performance of QAM and the relevant theoretic analysis is done , in order to overcome the unfavorable factors caused by the noises and attenuation of PLC and to balance the conflict between frequency-band efficiency and error-probability of QAM .

基于MATLAB的正交幅度调制系统仿真

Simulation of quadrature amplitude modulation system based on MATLAB

基于DVBC标准的数字电视系统采用正交幅度调制（QAM）传送信号。

Quadrature Amplitude Modulation ( QAM ) is used to transfer signals by digital TV system based on DVB_C standard .

DVB-C中实现正交幅度调制中频输出的两种方法

Two methods for the implementation of QAM IF output in DVB-C system

正交幅度调制（QAM）是一种同时利用幅度和相位传递信息的技术。

Quadrature amplitude modulation ( QAM ) is a technique that transmits information by both amplitude and phase modulation .

正交幅度调制（QAM）具有较高的调制效率，被广泛应用于各种数字通信系统中。

QAM ( Quadrature Amplitude Modulation ) has been widely used in various digital communication systems due to its high modulation efficiency .

正交幅度调制（QAM）是一种频谱利用率高、实现较为方便的载波传输方式。

Quadrature amplitude modulation ( QAM ) is a way of carrier transmission that has high spectrum efficiency and is easily implemented .

在满足系统预设可靠性要求下，获得自适应格形编码正交幅度调制（QAM）设计准则。

Under the preset BER requirement , the adaptive design criteria of trellis code quadrature amplitude modulation ( QAM ) are achieved .

基于多天线相关信道协方差反馈，提出一种低复杂度自适应正交幅度调制（QAM）机制以提高系统发送速率。

A low-complexity adaptive quadrature amplitude modulation ( QAM ) scheme was presented to increase throughput for multi-antenna communication system with covariance feedback .

正交幅度调制（QAM）可以获得更高的信道频带效率，在高速水声通信中得到了广泛使用。

Quadrature amplitude modulation ( QAM ) can get a higher channel band efficiency , has been widely used in high-speed underwater acoustic communication .

从这一点出发，多元正交幅度调制（MQAM）、多载波调制（MCM）及自适应调制技术成为下一代移动无线系统中最有竞争力的几种候选技术。

From this point , M-ary Quadrature Amplitude Modulation ( MQAM ), MultiCarrier Modulation ( MCM ) and adaptive modulation techniques are good candidates in next generation mobile radio system .

正交幅度调制（QAM）和低密度奇偶校验码（LDPC）技术应用于很广泛的领域，如无线通信、有线电视传输、卫星通信等领域。

Both Quadrature Amplitude Modulation ( QAM ) and Low Density Parity Check Code ( LDPC ) are widely used in such fields as wireless communication , wired television transmission and satellite communication .

研究相关Nakagami衰落信道上恒定发射功率自适应M进制正交幅度调制的频谱效率。

The performance of the spectral efficiency for constant-power adaptive M-ary quadrature amplitude modulation schemes over correlated Nakagami fading channel under maximum ratio combining diversity reception is investigated .

在CMA算法基础上，利用多电平正交幅度调制（MQAM）信号的分布特点，提出了一种适合于MQAM数字通信系统的误差切换的盲均衡算法（ESA）。

In this paper , a new blind equalization algorithm based on the error switching is proposed for MQAM communication system , taking advantage of the distribution property of the constellation of MQAM .

数值分析结果表明，相对于自适应M进制正交幅度调制（MQAM），自适应Turbo编码MQAM系统吞吐量性能有显著提高，并且该性能受瞬时误码率要求的影响较小。

It is shown in our numerical results that significant improvements of system throughput performance of the adaptive Turbo-coded MQAM modulation over adaptive MQAM modulation have been achieved and the throughput performance is insensitive to the instantaneous BER requirement .

本文主要对调幅信号的相位分集接收，正交幅度调制（QAM）信号在相干光通信系统中的应用，以及相干光系统中的自动偏振控制技术进行了研究。

The phase diversity reception of the amplitude modulation signal , the application of quadrature amplitude modulation ( QAM ) signal in the coherent optical system , and the automatic polarization control in the coherent optical system are studied in this thesis .

为了快速自动识别低信噪比下的数字幅度调制进制，提出了一种识别M进制正交幅度调制（M-QAM）和M进制幅度键控（M-ASK）的调制进制的方法。

A method to identify the modulation levels of M-ary Quadrature Amplitude Modulation ( M-QAM ) and M-ary Amplitude shift keying ( M-ASK ) was developed to rapidly and automatically identify the modulation levels of digitally modulated signals at low signal-to-noise ratios ( SNR ) .

本文研究高速水声通信中正交幅度调制系统的盲均衡理论与算法，主要工作如下：（1）通过研究多模辅助算法的均衡原理，得到了一类基于星座图特点改进的多模辅助算法（CMAMA）。

In this paper , quadrature amplitude modulation system blind equalization algorithm in high-speed underwater acoustic communication is analyzed and the main work is as follows : ( 1 ) By studying the principle of MAMA , improved a class algorithm ( CMAMA ) based on the constellation features .

模拟面目标中频正交幅度调制系统

Quadrature Amplitude Modulation System of Middle Frequency for Simulated Surface Target

基于通信信道的数字传感信号正交幅度调制技术仿真研究

Simulation of digital sensor signal QAM technology based on communication channel

多载波正交幅度调制解调的仿真研究及系统实现

Simulation Research and System Realizing of Multicarrier Quadrature Amplitude Modulation

基于正交幅度调制的无线图像传输系统设计

Design of wireless image transmission system based on QAM

正交幅度调制的软件实现

Software implementation of quadrature amplitude modulation

通过基于二进制交换算法，文章给出了16相正交幅度调制的两个比较合适的序列映射关系。

By means of a new method based on " Binary-Switching " algorithm , it finally proposes two suitable index assignments .

因此，本文的第三部分在综述差分空时码研究现状的基础上，提出了适合正交幅度调制信号集合的一种差分空时频编码方法。

So Part III presents a method of differential space-time-frequency code in quadrature-amplitude modulation ( QAM ) modulation , based on some existing research of differential STC .

同时，为实际应用和科学合理地设计正交幅度调制系统，提供了便捷、高效、直观的仿真平台。

Therefore , it provides not only bases to choose modes of adaptable channel modulation but also a convenient and efficient simulation platform to design a QAM system practically and scientifically .

由于近似误码率公式存在误差，进而提出一种迭代算法，对各子流的功率进行微调，为用户的每个子流分配一种正交幅度调制速率，进一步提高频谱效率。

Furthermore , iterative substream power regulation arithmetic is proposed to compensate the error of the approximate bit error rate equation and allocate a kind of QAM rate for each data stream finally .