Description: 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码的正交频分复用系统.-master's degree thesis : LDPC codes in Rayleigh fading channels Performance Analysis channel coding technology can bring coding gain, Power saving valuable resources have become modern digital communication systems essential to the critical technologies. LDPC low complexity of the iterative decoding algorithm, having approximation Shannon limit performance. Because LDPC has many advantages, It reliable transmission of information in the application of good prospects has been caused rr academia and industry are taking, become the channel coding areas of the most watched one of the hot spots. This paper mainly discusses the LDPC Rayleigh fading channels in the performance Based on LDPC a space-time coding system, and based on LDPC orthogonal frequency division multiplexing system. Platform: |
Size: 2362694 |
Author:daniel |
Hits:
Description: 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
PB3 | WR
PD2 | INT
PD3 | ALE(A3)
由于采用的是m16做为主控，只能使用总线模拟方式，其读写速度有限，经测试约为双向11.8kBps(90kbps)。
由于ram有限，仅仅采用了332Bytes的数据缓冲做为收发buffer，超过此长度的以太网包将抛弃。
此工程文件仅仅做为cp220x的一个移植范例，高级tcpip应用代码因商业缘故不会提供，请勿找我询问。-m16 cp2200 a network interface. M16 use of internal RC oscillator 8 M, if we are to raise the frequency, please note time change Bus simulation function. Cp2200 module uses www.icdev.com.cn. changes pin44 connecting VCC, bus multiplexing, address data multiplexing. Software programmers use avrstudio4.12 sp4 winavr (bringing their avrstudio winavr embedded in the way). Hardware connections : m16 | cp2200 PORTA | AD0-7 pins | RST PB1 | CS PB2 | RD PB3 | WR NC | INT PD3 | ALE (A3) is used as the main control m16, It can only use bus simulation, the literacy rate is limited, After about a two-way test 11.8 kBps (90kbps). As the ram limited, merely using the 332 Bytes of data as a buffer TX buffer, Over this length of the Ethernet packets will be discarded. This works only as a document of a tr Platform: |
Size: 101751 |
Author:刘晓军 |
Hits:
Description: 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 Platform: |
Size: 1700 |
Author:的地方 |
Hits:
Description: 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码的正交频分复用系统.-master's degree thesis : LDPC codes in Rayleigh fading channels Performance Analysis channel coding technology can bring coding gain, Power saving valuable resources have become modern digital communication systems essential to the critical technologies. LDPC low complexity of the iterative decoding algorithm, having approximation Shannon limit performance. Because LDPC has many advantages, It reliable transmission of information in the application of good prospects has been caused rr academia and industry are taking, become the channel coding areas of the most watched one of the hot spots. This paper mainly discusses the LDPC Rayleigh fading channels in the performance Based on LDPC a space-time coding system, and based on LDPC orthogonal frequency division multiplexing system. Platform: |
Size: 2362368 |
Author:daniel |
Hits:
Description: 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
PB3 | WR
PD2 | INT
PD3 | ALE(A3)
由于采用的是m16做为主控，只能使用总线模拟方式，其读写速度有限，经测试约为双向11.8kBps(90kbps)。
由于ram有限，仅仅采用了332Bytes的数据缓冲做为收发buffer，超过此长度的以太网包将抛弃。
此工程文件仅仅做为cp220x的一个移植范例，高级tcpip应用代码因商业缘故不会提供，请勿找我询问。-m16 cp2200 a network interface. M16 use of internal RC oscillator 8 M, if we are to raise the frequency, please note time change Bus simulation function. Cp2200 module uses www.icdev.com.cn. changes pin44 connecting VCC, bus multiplexing, address data multiplexing. Software programmers use avrstudio4.12 sp4 winavr (bringing their avrstudio winavr embedded in the way). Hardware connections : m16 | cp2200 PORTA | AD0-7 pins | RST PB1 | CS PB2 | RD PB3 | WR NC | INT PD3 | ALE (A3) is used as the main control m16, It can only use bus simulation, the literacy rate is limited, After about a two-way test 11.8 kBps (90kbps). As the ram limited, merely using the 332 Bytes of data as a buffer TX buffer, Over this length of the Ethernet packets will be discarded. This works only as a document of a tr Platform: |
Size: 101376 |
Author:刘晓军 |
Hits:
Description: 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 Platform: |
Size: 1024 |
Author:的地方 |
Hits:
Description: 正交频分复用中当调制方式采用QDPSK时的解调程序-Orthogonal frequency division multiplexing modulation when used in QDPSK procedures at the time of demodulation Platform: |
Size: 2048 |
Author:NANA |
Hits:
Description: 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 design spectrum signals of three different digital filter, the signal will be three-way all the way signal synthesis, analysis of time-domain signal synthesis and frequency domain characteristics of signals and then synthetic through three digital filter designed to isolate the original three-way signal, the three-way analysis of time-domain signal waveform and spectrum, compared with the original signal on frequency division multiplexing features. Platform: |
Size: 4096 |
Author:无语 |
Hits:
Description: 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
frequency-division multiplexing (OFDM) block having a tile
structure in the frequency domain is proposed to perform synchronization.
Timing offsets are estimated using correlation-type
algorithms. By inserting some null subcarriers in the proposed tile
structure, we propose a computationally efficient subspace decomposition-
based algorithm for CFO estimation. The issue of optimal
tile length is studied both theoretically and through simulations.
By judiciously designing the tile size of the pilot, the proposed
algorithms are shown to have better performance, in terms of
synchronization errors and bit error rate, than the time-division
multiplexing-based training method and the computationally demanding
space-alternating generalized expectation-maximization Platform: |
Size: 985088 |
Author:ashish |
Hits:
Description: 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
frequency-division multiplexing (OFDM) block having a tile
structure in the frequency domain is proposed to perform synchronization.
Timing offsets are estimated using correlation-type
algorithms. By inserting some null subcarriers in the proposed tile
structure, we propose a computationally efficient subspace decomposition-
based algorithm for CFO estimation. The issue of optimal
tile length is studied both theoretically and through simulations.
By judiciously designing the tile size of the pilot, the proposed
algorithms are shown to have better performance, in terms of
synchronization errors and bit error rate, than the time-division
multiplexing-based training method and the computationally demanding
space-alternating generalized expectation-maximization Platform: |
Size: 728064 |
Author:ashish |
Hits:
Description: 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
systems, which do not use differential modulation
schemes or frequency division multiplexing
The equalizer is the most expensive component of a data
demodulator and can consume over 80 of the total
computations needed to demodulate a given signal [01]
Adaptive Equalization
KEVIN BANOVIC Slide 3
RESEARCH CENTRE FOR INTEGRATED MICROSYSTEMS – UNIVERSITY OF WINDSOR
EQUALIZATION TUTORIAL
Channel
Equalizer
Adjustment
FIR
Equalizer
Decision
Device
Error
Computation
s k ( ) y k ( )
e k ( )
r k ( ) s k ( )
Training
Sequence
Symbol
Statistics
Blind Mode
Decision-Directed
Mode Training Mode
Adaptive Equalization Platform: |
Size: 404480 |
Author:陈鹏 |
Hits:
Description: 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 certain circumstances the use of frequency division multiplexing network delay caused. Platform: |
Size: 713728 |
Author:sunbaoming |
Hits:
Description: 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. Platform: |
Size: 1187840 |
Author:yingao |
Hits:
Description: 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 based on the spectral characteristics of the signal, the the Rd signal synthesizing all the way to the signal analysis in time domain and frequency domain characteristics of the synthesized signal, and then the synthesis signal by five digital filter designed, separated original signal Rd, the time-domain waveform and spectrum analysis the Rd signal is obtained, to be compared with the original signal, the frequency division multiplexed with the characteristics. Platform: |
Size: 7168 |
Author:王峰 |
Hits:
Description: 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-scheduled on the same
time-frequency resources to exploit this gain
among two or more UE units. This is particularly
beneficial as high-rank SU-MIMO transmission
is often limited by the number of
antennas and antenna design constraints at the
user end, whereas high-rank transmission using
MU-MIMO is more feasible due to the scattered
user distribution.
It is well known that the information theoretic
optimal MU-MIMO scheme is dirty paper
coding (DPC), which unfortunately is a nonlinear/
non-causal beamforming scheme and therefore
unrealistic in real-life applications. From a
practical deployment point of view, the most Platform: |
Size: 407552 |
Author:nebiyu |
Hits:
Description: 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 shortcomings of orthogonal frequency division multiplexing (OFDM), such as excessive out of band radiation and high peak to average ratio (PAPR), new wireless air interface (NR) standard for 3G Partner Program (3GPP) of 5g mobile communication has been proposed by major communication manufacturers, including filtered OFDM, windowed OFDM, filter bank OFDM, etc. Considering the higher communication rate and bandwidth requirements of 5g, and being suitable for high frequency communication (especially millimeter wave band) above 6 GHz, 5g candidate waveform needs higher time-frequency efficiency and better out of band radiation characteristics to meet the requirements of 5g communication.) Platform: |
Size: 632832 |
Author:4dsa5 |
Hits:
Search - time frequency multiplexing