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中文摘要：
针对第二代甚高速数字用户线路（VDSL2）网络中存在的串扰问题,提出一种基于频带的上行功率回退算法.从1％最坏情况模型出发,推导出UPBO参数（α,β）;根据环路不同频带的插损特性,独立估算用户线路的电气长度,实现远近用户发送信号功率谱密度的平衡.仿真实验结果表明,基于频带的上行功率回退算法能够有效改善和提高VDSL2系统传输性能及稳定性,即使环路中存在桥接抽头,仍然对数据速率有较大提升.
英文摘要：
To solve the problem of crosstalk invery high bit rate digital subscriber line 2 （VDSL2） networks,an upstream power back off （UPBO） algorithm based on frequency band is proposed.UPBO parameters （α,β） are calculated through the 1％ worst-case model,then the electrical length on each band is estimated based on the insertion loss of user loop independently,so as to balance the power spectrum density of transmit signal from far-near users.The simulation results show that UPBO algorithm based on frequency band improves the transmission performance and stability of VDSL2 system evidently,and increases data rates significantly even through there are bridge-taps in the loop.
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