相关实验视频
Updated: Jan 10, 2026
19:44
A Tactile Automated Passive-Finger Stimulator TAPS
Published on: June 3, 2009
14.2K
低复杂性的混合算法,用于在多种道条件下改进OTFS中的PAPR BER和PSD
Arun Kumar1, Aziz Nanthaamornphong2, Nishant Gaur3
1Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, Rangpo, Sikkim, India.
Scientific reports
|November 26, 2025
概括
这项研究引入了一种新的方法,Vm-PTS+Companding,以显著降低峰值到平均功率比率 (PAPR) 并提高位错误率 (BER) 在正交时频空间 (OTFS) 中与非正交多个接入 (NOMA) 系统.
科学领域:
- 无线通信无线通信
- 信号处理 信号处理
- 信息理论 信息理论
背景情况:
- 坐标时频空间 (OTFS) 调制在高流动性场景中提供了优势.
- 非直角多重接入 (NOMA) 通过允许用户共享资源来提高频谱效率.
- 高峰到平均功率比率 (PAPR) 和比特错误率 (BER) 是OTFS-NOMA系统的关键挑战.
研究的目的:
- 研究和改进OTFS-NOMA系统中PAPR和BER的性能,在雷利淡化通道上进行.
- 评估各种PAPR降低技术的有效性,包括一种新的基于范德蒙德矩阵的部分传输序列与对比 (Vm-PTS+Companding).
- 在通道估计错误下分析系统的性能.
主要方法:
- 在256个子载体上使用256-QAM和512-QAM进行了模拟.
- 评估的技术包括Vm-PTS+Companding,Vm-SLM+Companding,传统的PTS,SLM,Companding以及剪切和过 (C&F).
- 分析的性能指标包括PAPR,BER,信号噪声比 (SNR) 和功率光谱密度 (PSD).
主要成果:
- 拟议的Vm-PTS+Companding实现了256-QAM的PAPR降低高达9dB,而512-QAM则降低了8.9dB.
- 该方案显示了比传统方法显著的PAPR增长 (2.9-9.9dB),即使有频道估计错误.
- 经过BER分析,SNR在理想通道中提高了3.5-13.7dB,在错误条件下提高了16dB.
- 通过PSD评估证实了光谱泄漏的减少.
结论:
- Vm-PTS+Companding有效地优化了OTFS-NOMA系统中的PAPR和BER.
- 拟议的方法提高了系统性能,特别是在具有频道估计错误的具有挑战性的无线环境中.
- 这种技术支持易出错的无线通信系统中的高数据速率.
相关概念视频
01:18Reducing Line Loss
350
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
350
01:18Uniform Depth Channel Flow: Problem Solving
420
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
420
01:07Time-Domain Interpretation of PD Control
355
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
Consider the example of control of motor torque. Initially, a positive...
355
01:22Upsampling
569
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
569