概括
本研究介绍了一种全光学自我干扰取消 (SIC) 方法,用于联合同频同时间全双流 (CCFD) 阶段阵列系统. 这种新的方法实现了显著的干扰减少和精确的信号延迟控制,以增强无线通信.
科学领域:
- 光学工程是指光学工程.
- 无线通信系统无线通信系统
- 信号处理 信号处理
背景情况:
- 联合同频同时间全双流 (CCFD) 阶段阵列技术在频谱效率和通信能力方面提供了显著的优势.
- CCFD系统在自我干扰取消 (SIC) 和精确的信号延迟管理方面面临挑战.
- 现有的SIC方法在先进的阶段式数组架构中经常与复杂性和性能作斗争.
研究的目的:
- 为CCFD阶段阵列系统提出并验证一种全光学SIC方法,具有延迟向下转换.
- 解决高性能CCFD应用中自我干扰取消和信号延迟的关键要求.
- 为了使CCFD阶段阵列在苛刻的通信环境中能够稳健有效地运行.
主要方法:
- 一个全光学SIC架构,利用萨格纳克循环进行延迟和偏振控制.
- 在SIC的光学领域实施延迟/振幅匹配和相反.
- 使用分散介质 (DM) 和可调的激光波长延迟中间频率 (IF) 信号的时间延迟,使用直流偏移控制来减轻功率衰减.
主要成果:
- 实现单频SIC深度超过40dB和宽带SIC深度超过26dB (500MHz和1GHz带宽).
- 在11公里的光纤传输中,证明了相对平坦的链接收益.
- 展示了可调节的IF信号延迟,通过调整激光波长 (1544-1556 nm) 从-1120到1120 ps.
结论:
- 拟议的全光学SIC方法有效地取消了自我干扰,并在CCFD阶段阵列系统中提供了精确的信号延迟控制.
- 该技术为提高先进无线和卫星通信的频谱效率和通信能力提供了可行的解决方案.
- 进一步优化系统增益和图像拒绝是可行的,为更广泛的应用场景铺平了道路.
相关概念视频
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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
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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...
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Reconstruction of Signal using Interpolation
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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