相关实验视频
Updated: Jul 29, 2025

07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
10.9K
频道的信息速率与淡化,侧面信息和自适应代码词的频道
1School of Computation, Information and Technology, Technical University of Munich (TUM), 80333 Munich, Germany.
Entropy (Basel, Switzerland)
|May 27, 2023
概括
一般化相互信息 (GMI) 计算了色通道的可实现速率. 本研究探讨了GMI的变化及其优化,以提高通信性能.
科学领域:
- 信息理论 信息理论
- 无线通信无线通信
- 信号处理 信号处理
背景情况:
- 通用互联信息 (GMI) 是评估可实现的通讯速率在色道的一个关键指标.
- 在发射器 (CSIT) 和接收器 (CSIR) 处的通道状态信息的可用性和使用,显著影响通信系统的性能.
- 现有的GMI计算方法,特别是那些使用具有最小平均平方误差 (MMSE) 估计的反向通道模型的方法,存在优化挑战.
研究的目的:
- 在发射器 (CSIT) 和接收器 (CSIR) 的各种条件下,使用通用互通信息 (GMI) 计算消光通道的可实现速率.
- 调查和比较用于GMI计算的不同辅助通道模型,重点关注其优化复杂性和可实现率.
- 分析自适应代码词和代码书设计对最大化GMI和实现道容量的影响.
主要方法:
- 使用了辅助通道模型的变化,具有添加式白色高斯噪声 (AWGN) 和循环对称的复杂高斯输入.
- 使用反向通道模型与MMSE估计用于最大速率计算和前向通道模型与线性MMSE估计用于更容易的优化.
- 将这些模型应用于未知CSIT,自适应代码词的色通道,并使用CSIT修改的常规代码书分析了标量级通道.
主要成果:
- 与线性MMSE估计的前向通道模型相比,与反向模型相比,为GMI优化提供了更容易处理的方法.
- 分区通道输出字母表,并为每个分区使用不同的辅助模型,可以增强GMI,并有助于确定容量扩展.
- 开发了部分CSIR的电源控制政策,并展示了全CSIT的MMSE政策,通过开启-关闭和雷利衰变通道示例进行验证.
结论:
- GMI提供了一个强大的框架,用于分析可实现的速率在变色道与不同的CSIT/CSIR.
- 选择辅助频道型号和输出字母分区有很大影响GMI和容量.
- 这些发现概括到阻断色的道,为涉及相互和定向信息的能力表达提供了洞察力.
更多相关视频
相关概念视频
Receiver Operating Characteristic Plot
285
A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
285
Properties of Fourier Transform I
204
The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
204
Basic Discrete Time Signals
246
The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is...
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is...
246
Design Example
348
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
348
Even and Odd Signals
946
An even signal, whether in continuous-time or discrete-time, is defined by its symmetry with its time-reversed version. Mathematically, this is represented as
946
Propagation Speed of Electromagnetic Waves
3.5K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.5K

