对于正交时频空间的多方向决策反均等化,水下声通信系统是水下声通信系统.
Lianyou Jing1, Qingsong Wang2, Qiulong Yang3
1Ocean Institute of Northwestern Polytechnical University, Taicang, Jiangsu 215400, China.
The Journal of the Acoustical Society of America
|April 9, 2025
概括
这项研究介绍了在水下声学 (UWA) 系统中用于正交时频空间 (OTFS) 调制的新型多向等分器. 这种新方法在具有挑战性的,时间变化的UWA环境中显著改善了符号检测.
科学领域:
- 电气工程 电气工程
- 信号处理 信号处理
- 水下通信是指水下通信.
背景情况:
- 坐标时频空间 (OTFS) 调制在时间变化的频道中提供了高性能.
- 由于频道的快速波动,水下声学环境 (UWA) 存在重大挑战.
- 现有的均衡技术很难完全减轻复杂的UWA通道中的错误.
研究的目的:
- 为基于OTFS的UWA系统开发一种全新的二维 (2D) 适应式多通道决策反均衡 (DFE) 技术.
- 设计和评估两个不同的多向DFE架构,以打击错误传播.
- 在动态UWA环境中增强符号检测准确性和系统性能.
主要方法:
- 引入一个 2D 适应式多通道 DFE,具有针对 OTFS 调制的多方向结构.
- 开发两个架构:平行组合方法和定向DFE的串行方法.
- 为平行架构推导最佳权重因子,并对串行架构中的加速融合进行分析.
主要成果:
- 拟议的多方向2D DFE算法在湖泊环境模拟和实验中表现出卓越的性能.
- 对比分析显示,与传统的2D DFE方法相比,其性能明显优于传统的2D DFE方法.
- 该技术表现出增强的符号检测能力,特别是在有限的试点资源和频道估计精度的情况下.
结论:
- 新型的多向2D DFE有效地减轻了基于OTFS的UWA通信系统中的错误传播.
- 无论是并行还是串行多方向架构,都在提高均等性能方面提供了明显的优势.
- 拟议的方法代表了可靠的水下声通信的重大进步.
相关概念视频
01:23Design Example
309
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...
309
01:06Echo
475
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
475
01:26Feedback control systems
256
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
256
01:24Effects of feedback
485
Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
485
01:10Interference: Path Lengths
1.2K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.2K
00:53Sound Waves: Interference
3.7K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.7K