一种在FTN系统下的低复杂度判决反馈均衡器

摘要

The existence of FTN ( Faster Than Nyquist) theory lays the foundation for increasing data trans-mission rate of communication system and however, FTN is at the expenses of introducing ISI ( Inter-Sym-bol Interference) and thus increasing the complexity of communication devices, especially the complexity of receivers. In order to reduce the complexity of receivers and based on IBDFE ( Iterative Block Decision Feedback Equalization) proposed by the famous Italian scholars, N. Benvenuto and S. Tomasin in 2014, LC-IBDFE ( Low-Complexity Iterative Block Decision Feedback Equalization) is proposed. Simulation re-sults indicate that the proposed LC-IBDFE is similar to IBDFE in performance, while the complexity is re-duced by about 11. 7% and 27. 6% respectively after 2 or 3 iterations respectively.%超Nyquist码元速率( FTN)理论的出现为提高通信系统数据传输速率奠定了基础。但是, FTN是以引入码间串扰( ISI )增加通信设备特别是接收机复杂度为代价的。为了降低接收机复杂度,在意大利著名学者N. Benvenuto和S. Tomasin 2014年给出迭代分组判决反馈均衡器( IBDFE)方法的基础上,提出了一种低复杂度的频域迭代分组判决反馈均衡器( LC-IBDFE )。仿真结果表明,LC-IBDFE在性能上与IBDFE近似。但是在经过2次迭代后,LC-IBDFE复杂度降低约11.7%；经过3次迭代后,复杂度降低约27.6%。