联合时间延迟和频率偏移估计方案用于点对多点连贯PON系统中多个ONU的激活
Optics express
|June 14, 2025
概括
在连贯的被动光学网络 (PON) 中激活光学网络单元 (ONU) 的新方法可以在不延迟上游数据的情况下同时进行注册. 这种方法准确地估计了时间延迟和频率偏移,这对于下一代接入网络至关重要.
科学领域:
- 光学网络的光学网络
- 电信工程 电信工程 电信工程
- 信号处理 信号处理
背景情况:
- 使用数字子载波复杂化 (DSCM) 的连贯被动光网络 (PON) 是下一代接入网络的关键.
- 时间和频率分割多重访问 (TFDMA) 提高了PON的灵活性和效率.
- 有效的光网络单元 (ONU) 激活对于上游同步而无影响延迟至关重要.
研究的目的:
- 为TFDMA连贯的PONs提出一个新的ONU激活方法.
- 为了能够共同估计在ONU激活期间的时间延迟和频率偏移.
- 确保ONU的激活不会对上游数据传输带来显著的延迟或退化.
主要方法:
- 结合Zadoff-Chu和Gold序列的注册信号与数据一起传输,消除了对安静窗口的需求.
- 时间延迟和频率偏移是通过计算注册信号的相关值来估计在接收器.
- 连续干扰取消用于支持同时注册多个ONU.
主要成果:
- 拟议的方案实现了1 ns的时间延迟估计精度和1 MHz的频率偏移估计精度.
- 在6x10GHz子载波连贯PON系统中的实验验证证证了该方法的有效性.
- 激活方案不引入上游信号传输的额外延迟,SNR处罚低于0.2dB.
结论:
- 新的ONU激活方法对TFDMA连贯的PON有效.
- 该方案符合下一代接入网络的严格延迟要求.
- 准确和高效的ONU激活是可以实现的,而不会影响上游数据传输质量.
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