QPSK is commonly used in communication because of its bandwidth efficiency.
QPSK调制方式频带利用率高，因而在通信系统中被广泛采用。
Digital Communication project, QPSK over AWGN and Rayliegh Multipath Effects.
数字通信工程，对AWGN和瑞利多径效应调制。
This paper proposes an iterative demodulation method applied in the bit-Interleaved QPSK system.
本文提出了比特交织的QPSK系统迭代解调的方法。
Based on support vector machine blind equalization algorithm, the use of the input signal is QPSK.
基于支持向量机的盲均衡算法，使用的输入信号是QPSK。
This paper mainly researches and analyzes QPSK-demodulated algorithms based on processing transponders.
本文主要研究和分析了基于处理转发器的QPS K解调算法。
The intermediate frequency circuit includes QPSK modulation based on HFA3724, PLL circuit based on MB1502.
中频部分主要由HFA3724正交调制解调器和基于MB1502的锁相频率合成电路等组成。
Quadrature phase shift keying(QPSK) signaling is employed to make efficient use of the available bandwidth.
传输信号采用正交相移键控调制方式，以有效利用有限通信带宽。
QPSK as an advanced digital modulation technique is fit for the digital satellite communication system well.
QPSK作为一种先进的数字调制方式，特别适用于数字卫星通信系统。
Therefore, the study of all-digital QPSK modulation and demodulation based on FPGA has important significance.
因此，基于FPGA的全数字QPSK调制解调的研究具有重要的意义。
The technology of QPSK has been applied in a lot of fields, it's the main modulation method in some big system.
QPS K调制技术应用相当广泛，已成为许多大型系统的主要调制手段。
The effect on modulation and demodulation of QPSK via carrier phase noise can not be ignored, and it is difficult to analyze.
载波相位噪声对QPS K调制解调的影响是不可忽略的，也是难以分析的。
The traditional differential space-time block code (DSTBC) suffers from the signal constellation expansion for QPSK modulation.
传统的差分空时分组编码(DSTBC)在QPSK调制时存在着信号星座扩展。
The modulation technology of the third generation mobile WCDMA system including the QPSK is introduced in this paper, including the QPSK.
介绍第三代移动通信WCDMA系统的调制技术，包括QPSK 调制和解调的基本原理，以及WCDMA 系统的调制方式。
In the rainfall circumstance the probability distribution of satellite channel capacity is analyzed in QPSK modulation and 4qam modulation.
在降雨环境中，进一步研究了卫星通信系统在QPSK调制和4qam调制下的信道容量的概率分布。
The results illustrate that the deterioration of error performances of MSK signal caused by false carrier phase is between that of BPSK and QPSK.
分析结果表明，MS K信号因载波相位误差而造成的误码性能恶化介于BPSK与QPSK之间。
The performance of QPSK signal transmitted through nonlinear mobile satellite channel is analyzed based on presumed frequency non-selective fading.
在平坦衰落假设基础上，分析了QPS K信号通过移动卫星信道的非线性性能。
The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
结果表明，用该算法可以精确估计载波相位和频差，有效地降低系统的误码率。
The target applications include 100-gigabit-per-second long-haul pol-mux (D)QPSK, 40-gigabit-per-second long-haul (D)QPSK, and 40G/100G parallel networking.
目标应用场合包括：每秒100吉比特的长距离极化多路（pol-mux）（差分）正交相移键控（QPSK），40吉比特每秒的长距离（差分）正交相移键控和40G/100G并行网络。
An introduction of the design and implementation of a broad-band square circuit is given, which is used to recover the carrier of the high speed QPSK signal.
介绍采用微波混频器的上变频特性实现宽带平方电路的设计方法与具体实现，主要用于高码速率QPS K信号的载波恢复。
We put forward a method which can easily be realized in DSP and direct sequence spread-spectrum system based on QPSK, it achieved a good performance in tests.
提出了易于在DSP以及QPSK的直接序列扩展频谱系统中实现的方法，并在测试中达到了较好的性能。
In DVB satellite transmission system used QPSK, using QAM cable transmission, terrestrial transmission using COFDM (coded orthogonal frequency division multiplexing) way.
在DVB系统中卫星传输采用QPSK，有线传输采用QAM方式，地面传输采用COFDM(编码正交频分复用)方式。
This paper deals with a digital speech communicator of very low frequency and low bit digital communication based on software ratio, which USES the technique of QPSK and FEC coding.
本文论述了一种基于软件无线电的甚低频低码率语音数字岩层通信机，它采用了QPSK调制和FEC信道编码技术。
The results show that because of its low computational complexity and low power consumption, the QPSK-demodulated algorithms in the paper is more suitable for on-board demodulation system.
结果表明，文中提出的改进QPS K解调算法具有运算相对简便和低功耗的特点，更合适用于星上的解调系统。
The error-rate performance of the high-speed QPSK digital satellite communication system with cochannel large capacity FDM-PM signal interference is studied by means of computer simulation.
本文用计算机模拟的方法研究高速QPSK数字卫星系统受大容量FDM-FM信号同波道干扰时的系统误码特性。
This paper analyses the anti-noise performance of digital satellite TV receiver system, and discuses the anti-noise capability of R-S decoder, of convolutional decoder and of QPSK demodulator.
分析卫星数字电视接收系统的性能以及卫星数字电视接收机中R-S解码器、卷积解码器和QPSK解调器等部分电路对系统抗噪声性能的贡献。
A computer simulation system is constructed, which is suitable for studying the error-rate performance of the high-speed QPSK digital satellite communication system under interference and noise.
构成了适合于研究干扰和噪声条件下高速QPS K数字卫星系统误码特性的计算机模拟系统。
Having realized the modulation and demodulation algorithm of ASK, FSK, QPSK on the software radio platform, and has provided the modulation and demodulation flow chart and the main part procedure.
在软件无线电平台上研究并实现了ASK、FSK、QPSK等方式的调制解调算法，并给出了调制解调的流程图和主要部分的程序。
It is proposed a design principle and method of the baseband QPSK modem in radio communication system with discussion about the key hardware technology and the detailed operating process of the modem.
文章提出了一种软件无线电系统中基带调制解调器的设计原理和实现方法，阐述了系统实现的关键硬件技术和系统详细工作工程。
Finally the simulation results show that the nonlinear performance and compatibility of MSK modulated navigation signals are better than QPSK modulated signals, ensuring the code tracking performance.
仿真结果表明，在保证信号跟踪性能的前提下，卫星导航信号采用MSK调制时的非线性和兼容性优于同参数下的QPSK调制。
Finally the simulation results show that the nonlinear performance and compatibility of MSK modulated navigation signals are better than QPSK modulated signals, ensuring the code tracking performance.
仿真结果表明，在保证信号跟踪性能的前提下，卫星导航信号采用MSK调制时的非线性和兼容性优于同参数下的QPSK调制。
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