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Description: 这是在AWGN信道下四相键控调制，以及其性能分析。-This is the AWGN Channel 4 phase shift keying modulation, as well as its performance analysis.
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Size: 50766 |
Author: wangping |
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Description: 四相相移键控信号简称“QPSK”。它分为绝对相移和相对相移两种。由于绝对相移方式存在相位模糊问题，所以在实际中主要采用相对移相方式QDPSK。它具有一系列独特的优点，目前已经广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。 QPSK是英文Quadrature Phase Shift Keying的缩略语简称，意为正交相移键控，是一种数字调制方式。在数字信号的调制方式中QPSK四相移键控是目前最常用的一种卫星数字信号调制方式,它具有较高的频谱利用率、较强的抗干扰性、在电路上实现也较为简单。
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Size: 526851 |
Author: yanghoho6 |
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Description: QPSK是英文Quadrature Phase Shift Keying的缩略语简称，意为正交相移键控，是一种数字调制方式。在19世纪80年代初期,人们选用恒定包络数字调制。这类数字调制技术的优点是已调信号具有相对窄的功率谱和对放大设备没有线性要求,不足之处是其频谱利用率低于线性调制技术。19世纪80年代中期以后,四相绝对移相键控(QPSK)技术以其抗干扰性能强、误码性能好、频谱利用率高等优点,广泛应用于数字微波通信系统、数字卫星通信系统、宽带接入、移动通信及有线电视系统之中......理解QPSK调制解调的基本原理，并使用MATLAB编程实现QPSK信号在高斯信道和瑞利衰落信道下传输，以及该方式的误码率测试。复习MATLAB编程的基础知识和编程的常用算法以及使用MATLAB仿真系统的注意事项，并锻炼自己的编程能力，通过编程完成QPSK调制解调系统的仿真，以及误码率测试，并得出响应波形。在完成要求任务的条件下，尝试优化程序。 通过本次实验，除了和队友培养了默契学到了知识之外，还可以将次实验作为一种推广，让更多的学生来深入一层的了解QPSK以至其他调制方式的原理和实现方法。可以方便学生进行测试和对比。足不出户便可以做实验。
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Size: 798720 |
Author: 1010138463@qq.com |
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Description: This is a model of a QPSK modulation system for transmission over a bandpass channel with fc = 100 Hz and B = 30 Hz and AWGN at the receiver. SRRC fi lters with excess bandwidth α = 0.18 are employed. The receiver includes an NDA timing recovery loop followed by a DD phase recovery loop. -This is a model of a QPSK modulation system f or transmission over a bandpass channel with fc = 100 Hz and B = 30 Hz and AWGN at the receiver. SRRC
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Size: 15360 |
Author: xiaoying |
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Description: 通信中的QPSK相位调制建摸，其中考虑了多径和高斯的影响-Communication QPSK modulation phase modeling, which takes into account the multi-path effects and Gaussian
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Size: 4096 |
Author: 张一 |
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Description: 这是在AWGN信道下四相键控调制，以及其性能分析。-This is the AWGN Channel 4 phase shift keying modulation, as well as its performance analysis.
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Size: 50176 |
Author: wangping |
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Description: 通信系统中常用的多进制数字相位调制的源代码 并结合ofdm系统 加入了相应的保护前缀（cp）和导频序列 应用于有关ofdm的信道估计等系统-Communication systems commonly used in multi-band digital phase modulation of the source code and combine OFDM system by adding a prefix corresponding protection (cp) and the pilot sequence used in the relevant channel estimation of OFDM systems
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Size: 1024 |
Author: bingo |
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Description: 对两种调相方法进行分析比较,通过MATLAB编程对比两种方式的区别与联系-Phase modulation of two methods of analysis and comparison, through MATLAB programming in two ways the difference between contrast and contact
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Size: 1024 |
Author: 小猪 |
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Description: 基于锁相环的BPSK，QPSK的调制解调程序，并给出了仿真结果-Phase-locked loop based on the BPSK, QPSK modulation and demodulation of the procedures and simulation results
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Size: 39936 |
Author: 神大地 |
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Description: 定义锁相环的工作模式：单载波为“1”、BPSK调制为“2”、QPSK调制为“3”-The definition of phase-locked loop mode of operation: single-carrier for the " 1" , BPSK modulation for the " 2" , QPSK modulation for the " 3"
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Size: 1024 |
Author: 昌平荣 |
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Description: 四进制相移键控，樊昌信《通信原理》内容-Quaternary phase shift keying, Fan Changxin " Communication Theory" content
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Size: 1024 |
Author: 昌平荣 |
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Description: QPSK是一种二维调制技术，其中水平轴称为同相轴，垂直轴称为正交轴，分别对应于星座图上的1和Q坐标。同相载波指载波本身，正交载波指相位旋转90度的载波1周。QPSK调制在实现时是采用正交调幅的方式，某星座点在1坐标上的投影去调制同相载波的幅度，在Q坐标上的投影去调制正交载波的幅度，然后将两个调幅信号相加就是所需的调相信号-QPSK is one kind of two-dimensional modulating technology, the horizontal axis is called the alignment, the vertical axis is called the normal axis, corresponds separately in the star map 1 and the Q coordinate. The synchronism carrier refers to the carrier itself, the orthogonal carrier refers to the phase rotation 90 degree carrier 1 week. QPSK modulation when realization is uses the orthogonal amplitude modulation the way, some constellation in 1 coordinate s projection demodulate synchronism carrier s scope, in the Q coordinate s projection demodulate orthogonal carrier s scope, then two amplititude-modulated signal adding together is the phase-modulated wave which needs
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Size: 1024 |
Author: john |
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Description: qpsk matlab simulink receiver and transmitter.
Quadrature Phase shift keying
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Size: 7168 |
Author: farooq.ahmad |
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Description: 四相绝对相移键控的仿真和分析，四个图形合成，有意思-Four-phase phase-shift keying absolute simulation and analysis, four graphics synthesis, interesting
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Size: 1024 |
Author: renkaiqiang |
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Description: the code for four bit qpsk with 90 degrees phase shift with constellation and without constellation of noise is given
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Size: 1024 |
Author: rads |
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Description: 实现qdpsk数字调制，应用的是相位选择法进行调制-Achieve qdpsk digital modulation, the phase selection method is applied to modulate
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Size: 3072 |
Author: king |
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Description: 用Verilog语言实现QPSK调制，QPSK是一种数字调制方式。它分为绝对相移和相对相移两种。
-Verilog language using QPSK modulation, QPSK is a digital modulation. It is divided into absolute and relative phase shift of the phase shift of two.
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Size: 1024 |
Author: 陈华 |
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Description: 正交相移键控（Quadrature Phase Shift Keyin，QPSK）是一种数字调制方式。它分为绝对相移和相对相移两种。由于绝对相移方式存在相位模糊问题，所以在实际中主要采用相对移相方式DQPSK。目前已经广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。(Quadrature phase shift keying (quadrature phase shift keyin, QPSK) is a digital modulation. It is divided into absolute and relative phase shift of the phase shift of two. Because of the absolute phase shift way of phase ambiguity, so in practice mainly uses the relative phase shift dqpsk. has been widely used in wireless communication, a a very important way of modulation and demodulation in modern communication.)
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Size: 3072 |
Author: Luss
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Description: Quadrature Amplitude Modulator (QAM) in digital communication system, generation of Quadrature Phase Shift Keyed (QPSK or 4-PSK) signal and demodulation. Introduction: The QAM principle: The QAM modulator.
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Size: 64512 |
Author: Khan17
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Description: QPSK正交相移键控matlab的仿真 目前已经广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。(QPSK (Quadrature Phase Shift Keying) is a phase modulation algorithm.)
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Size: 219136 |
Author: yuluoxingwei |
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