Description: Abstract-The effect of the companding process on QAM signals
has been under investigation for the past several years. The
compander, included in the PCM telephone network to improve
voice performance, has an unusual affect on digital QAM data
signals which are transmitted over the same channel. The quantization
noise, generated by the companding process which is multiplicative
(and asymmetric), degrades the detectability performance
of the outermost points of the QAM constellation more
than that of the inner points.
The combined effect of the companding noise and the inherent
white gaussian noise of the system, leads us to a re-examination of
signal constellation design.
In this paper we investigate the detectability performance of a
number of candidates for signal constellations including, a typical
rectangular QAM constellation, the same constellation with the
addition of a smear-desmear operation, and two new improved
QAM constellation designs with two-dimensional warpi Platform: |
Size: 1076882 |
Author:雨笑了 |
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Description: 一个可以监控计算机的系统源码，其中增加了详细的说明（设计，编译，和使用手册),希望大家喜欢-one can monitor computer system source code, which added a detailed explanation (design, build, and the use of manual), hope you like Platform: |
Size: 5177344 |
Author:许敬祥 |
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Description: CVSD的好文档算法和仿真都有CVSD的好文档-CVSD good documentation CVSD algorithm and simulation have a good document Platform: |
Size: 169984 |
Author:baiyanru |
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Description: Abstract-The effect of the companding process on QAM signals
has been under investigation for the past several years. The
compander, included in the PCM telephone network to improve
voice performance, has an unusual affect on digital QAM data
signals which are transmitted over the same channel. The quantization
noise, generated by the companding process which is multiplicative
(and asymmetric), degrades the detectability performance
of the outermost points of the QAM constellation more
than that of the inner points.
The combined effect of the companding noise and the inherent
white gaussian noise of the system, leads us to a re-examination of
signal constellation design.
In this paper we investigate the detectability performance of a
number of candidates for signal constellations including, a typical
rectangular QAM constellation, the same constellation with the
addition of a smear-desmear operation, and two new improved
QAM constellation designs with two-dimensional warpi Platform: |
Size: 1076224 |
Author:雨笑了 |
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Description: PCM 系统仿真设计PPT 通信系统仿真设计-PCM System Simulation Design Simulation and Design of Communication Systems PPT Platform: |
Size: 176128 |
Author:shirley |
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Description: PCM编码系统的设计【课程设计】PCM编码（又叫脉冲编码调制）：数字通信的编码方式之一。主要过程是将话音、图像等模拟信号每隔一定时间进行取样，使其离散化，同时将抽样值按分层单位四舍五人取整量化，同时将抽样值按一组二进制码来表示抽样脉冲的幅值。-PCM coding system design curriculum design】 【PCM encoding (also known as pulse code modulation): digital communications, one of the encoding. The main process is to voice, image and other analog signal at a certain time for sampling, to discretization, sampling at the same time, the value of homes by the hierarchical units in five four rounded to quantify the sampling values at the same time, a group of binary code to indicate the sample pulse amplitude. Platform: |
Size: 237568 |
Author:zhen |
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Description: 基于stm32的数字化语音存储与回放系统的软件设计。该系统经过拾音器采集语音信号，经带通滤波与AGC后，进入AD，然后数据存入SRAM，再由DA送至带通滤波，由喇叭将语音信号恢复。该系统可以很好的存储与回放语音信号。，
本源码是在mdk上开发的。 软件设计分两个模块：压缩解压编码与存储模块。压缩编码有PCM编码和ADPCM编码两种可用按键选择；存储是FSMC存储（256k flash）存储。-Stm32 of digital voice storage and playback system-based software design. The system has been collecting voice signal pickup by the bandpass filter and AGC, into the AD, then the data are stored in SRAM, band-pass filter is then sent by the DA, to restore the voice signal from the speaker. The system can be a good storage and playback voice signal. , The source is developed in mdk. The software design is divided into two modules: the compression and decompression coding and storage module. Compression PCM coding and ADPCM encoding the two available buttons store is the the FSMC store (256k flash) storage. Platform: |
Size: 1845248 |
Author:summery |
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Description: 通信原理实验，简单的通信系统设计，对图像采用PCM编码、OOK调制、过awgn信道后解调、解码，最后恢复内容-Communication principle experiment, a simple communication system design, image using PCM coding, OOK modulation, over awgn channel demodulation, decoding, and finally resume content Platform: |
Size: 12288 |
Author:lixz |
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Description: 代码附后
本设计结合 PCM 的抽样、量化、编码原理，利用 MATLAB 软件编程和绘图功能，完 成了对脉冲编码调制（PCM）系统的建模与仿真分析。课题中主要分为三部分对脉冲编码 调制（PCM）系统原理进行建模与仿真分析，分别为采样、量化和编码原理的建模仿真。 同时仿真分析了采样与欠采样的波形、均匀量化与 A 律 13 折线非均匀量化的量化性能及 其差异。通过对脉冲编码调制（PCM）系统原理的仿真分析，设计者对 PCM 原理及性能 有了更深刻的认识，并进一步掌握 MATLAB 软件的使用。 -This design combined with PCM sampling, quantization, coding theory, using MATLAB software programming and graphics capabilities, completed the pulse code modulation Modeling and Simulation (PCM) System. The issue is divided into three portions of pulse code modulation (PCM) system principle of modeling and simulation analysis, namely sampling, modeling and simulation quantization and coding principles. While the simulation waveform sampling and undersampling, uniform quantization and A-law 13 fold non-uniform performance and the quantized difference. By pulse code modulation (PCM) system principle of simulation analysis, the designer of the PCM principles and performance of a deeper understanding and further master the use of MATLAB software.
Platform: |
Size: 1548288 |
Author:高山 |
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Search - design a pcm system