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硕士学位论文:LDPC码在瑞利衰落信道中的性能分析
信道编码技术可以带来编码增益，节省宝贵的功率资源，己经成为现代数字
通信系统中必不可少的关键技术。LDPC码采用低复杂度的迭代译码算法，且具有
逼近香农限的性能.由于LDPC码具有诸多优点，它在信息可靠传输中的良好应
用前景己经引起学术界和rr业界的高度重视，成为当今信道编码领域最受瞩目的
研究热点之一。
本文主要探讨了LDPC码在瑞利衰落信道中的性能，基于LDPC码的分组空
时码系统，以及基于LDPC码的正交频
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m16+cp2200组成的网络接口。
m16使用内部RC振荡8M，如果要提高主频，请注意修改模拟总线读函数。
cp2200模块使用www.icdev.com.cn的，更改pin44连接VCC，即总线复用方式，地址数据复用。
软件编写使用avrstudio4.12+sp4+winavr（avrstudio自带的winavr嵌入方式）。
硬件连接：
m16 | cp2200
PORTA | AD0－7
PB0 | RST
PB1 | CS
PB2 | RD
P
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基于matlab的时分复用和频分复用的方针-based on the time division multiplexing Matlab and frequency division multiplexing approach
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通信时常采用的信道复用技术包括频分复用、时分复用和统计时分复用。本代码测试了在一定环境下采用频分复用技术带来的网络时延。-Communication channel multiplexing is often used, including frequency division multiplexing, time division multiplexing and statistical time division multiplexing. The code is tested in cer
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选择三个不同频段的信号对其进行频谱分析，根据信号的频谱特征设计三个不同的数字滤波器，将三路信号合成一路信号，分析合成信号的时域和频域特点，然后将合成信号分别通过设计好的三个数字滤波器，分离出原来的三路信号，分析得到的三路信号的时域波形和频谱，与原始信号进行比较，说明频分复用的特点。-Choice of three different signal-band spectral analysis carried out, according to the characteristics of the
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Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing(OFDM) systems.-Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-divi
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In this paper, we investigate the timing and carrier
frequency offset (CFO) synchronization problem in decode and
forward cooperative systems operating over frequency selective
channels. A training sequence which consists of one orthogonal
fr
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In this paper, we investigate the timing and carrier
frequency offset (CFO) synchronization problem in decode and
forward cooperative systems operating over frequency selective
channels. A training sequence which consists of one orthogonal
fr
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An effecient algorithm has been proposed by
Schmidl and Cox for carrier frequency estimation in orthogonal
frequency-division multiplexing systems. The scheme is based
on the transmission of a training symbol composed of two
identical halves
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Adaptive equalization教程-Adaptive equalizers compensate for signal distortion
attributed to intersymbol interference (ISI), which is
caused by multipath within time-dispersive channels.
Typically employed in high-speed communication
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Designing spectral e±cient, high-speed wireless links that o® er high quality-
of-service and range capability has been a critical research and engineering chal-
lenge. In this thesis, we mainly address the complexity and performance issues o
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正交频分复用(OFDM) 是第四代移动通信的核心技术。该文首先简要介绍了OFDM基本原理,重点研究了理想同步情
况下,保护时隙(CP) 和不同的信道估计方法在高斯信道和多径瑞利衰落信道下对OFDM系统性能的影响。在给出OFDM系
统模型的基础上,用MATLAB语言实现了整个系统的计算机仿真并给出参考设计程序。最后给出在不同的信道条件下,保
护时隙、信道估计方法对OFDM系统误码率影响的比较曲线,得出了较理想的结论。-Orthogonal frequency division mult
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四路信息时分复用和解复用，包含串并转换，并串转换，提取帧同步，分频，移位寄存器。-Quad information time-division multiplexing and demultiplexing, contains the string conversion, parallel-serial conversion, extracting the frame synchronization, frequency division, the shift register.
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选择五个不同频段的信号对其进行频谱分析，根据信号的频谱特征设计五个不同的数字滤波器，将五路信号合成一路信号，分析合成信号的时域和频域特点，然后将合成信号分别通过设计好的五个数字滤波器，分离出原来的五路信号，分析得到的五路信号的时域波形和频谱，与原始信号进行比较，说明频分复用的特点。-To select one of five different band signal spectrum analysis and design of five different digital filter ba
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时分复用
频分复用
通信原理课程项目
数字基带传输-Time Division Multiplexing
Frequency division multiplexing
Code Division Multiplexing
TDM FDM CDM
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对仿真信号进行复morlet小波变换后，绘制的时频图。-After the simulated signal multiplexing morlet wavelet transform, time-frequency diagram drawn.
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Also see orthogonal frequency-division multiplexing ( OFDM ), frequency-division multiplexing ( FDM ), and time-division multiplexing ( TDM ).
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MU-MIMO is widely considered a key technology
for system capacity improvement in modern
wireless networks. In contrast to
SU-MIMO, where the spatial multiplexing gain
is confined to a single user, MU-MIMO allows
multiple users to be co-sche
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基于OQAM/PDM CO-OFDM系统提出了一种时域的信道估计方法，可以有效提高估计效率。
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于正交频分复用(OFDM)存在由带外辐射过高、峰均比(PAPR)过大等缺点，面向第5代移动通信(5G)的第3代合作伙伴计划(3GPP)的新无线空口(NR)标准，各大通信厂商都提出了包括滤波正交频分复用(Filtered-OFDM)、加窗OFDM、滤波器组OFDM(FB-OFDM)等新波形技术。考虑到5G更高的通信速率及带宽需求,并需适用于6 GHz以，上的高频通信(尤其是毫米波频段) ,5G候选波形需要更高的时频效率和更优的带外辐射特性,以满足5G通信的要求"。(Due to the
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