概括
本研究引入了一种新的多样性结合方案,使用复杂值决策定向最小平均平方 (CV-DD-LMS) 算法来改进QPSK系统中的数字信号处理. 这种新的方法减少了复杂性,避免了循环滑动,在实时实验中得到验证.
科学领域:
- 光学通信是指光学通信.
- 数字信号处理 数字信号处理
- 适应性过是一种自适应性过.
背景情况:
- 结合多样性的方案对于提高光学接收器性能至关重要.
- 载波阶段恢复 (CPR) 和束组合通常是独立处理的,增加了系统的复杂性.
- 现有方法在低信号噪声比率 (SNR) 下可能会出现周期滑动 (CS) 和性能降低.
研究的目的:
- 评估一个与复杂值决策定向最小平均平方 (CV-DD-LMS) 算法集成的新型多样性结合方案.
- 证明拟议方案的实时实验验证.
- 为了减少光通信系统的整体数字信号处理复杂性.
主要方法:
- 使用CV-DD-LMS算法同时执行光束组合和载体阶段恢复 (CPR).
- 在低SNR条件下进行了数值模拟,以评估与独立CPR模块的性能.
- 实验验证是在FPGA上进行的,该FPGA实现了实时2.5Gb/s QPSK多样性接收系统,具有三个输入.
主要成果:
- 基于CV-DD-LMS的方案有效地避免了模拟中的循环滑动 (CS),优于具有独立CPR的方案.
- 实验结果显示在静态和动态功率波动条件下 (100kHz) 的稳定性能.
- 与传统方法相比,拟议的方案大大降低了计算复杂性.
结论:
- 使用CV-DD-LMS算法的新型多样性结合方案为光通信系统提供了强大且计算效率高的解决方案.
- 实时FPGA实施证实了综合方法的实际可行性和稳定的性能.
- 这种方法在简化QPSK接收器的数字信号处理方面取得了重大进展.
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