短波宽带波形是现代短波通信的最新研究成果,短波信道时变多径传播效应会产生严重的码间干扰(ISI),必须采用均衡技术消除ISI。迭代均衡技术(Turbo均衡)将信号检测技术和译码技术结合起来,比传统判决反馈均衡(DFE)技术具有更强抗ISI能力...短波宽带波形是现代短波通信的最新研究成果,短波信道时变多径传播效应会产生严重的码间干扰(ISI),必须采用均衡技术消除ISI。迭代均衡技术(Turbo均衡)将信号检测技术和译码技术结合起来,比传统判决反馈均衡(DFE)技术具有更强抗ISI能力。研究了短波宽带波形Turbo均衡技术,提出了一种低复杂度的迭代检测方法用于短波宽带波形,仿真结果表明,在短波差信道条件下,Turbo均衡比DFE均衡的性能增益超过1.5 d B。展开更多
The single-carrier block transmission（SCBT）,a.k.a.,single-carrier frequency-domain equalization（SC-FDE）,is being considered as an option technique for the wireless personal area network（WPAN） operating at 60 GHz...The single-carrier block transmission（SCBT）,a.k.a.,single-carrier frequency-domain equalization（SC-FDE）,is being considered as an option technique for the wireless personal area network（WPAN） operating at 60 GHz.It is found that for residential environment,in non-line-of-sight（NLOS） multi-path channels,the SCBT is much more effective to combat the inter-symbol interference（ISI） compared with orthogonal frequency division multiplexing（OFDM）.Low-density parity-check（LDPC） codes are a class of linear block codes which provide near capacity performance on a large collection of data transmission and storage channels while simultaneously admitting implementable decoders.To facilitate using LDPC codes for SCBT system,a new log-likelihood ratio（LLR） calculation method is proposed based on pilot symbols（PS）.Golay Sequences whose sum autocorrelation has a unique peak and zero sidelobe are used for creating the PS.The position and length of the PS are not fixed in the data blocks.The simulation results show that the proposed method can significantly improve the LDPC decoding performance in SCBT system.This is very promising to support ultra high-data-rate wireless transmission.展开更多
文摘短波宽带波形是现代短波通信的最新研究成果,短波信道时变多径传播效应会产生严重的码间干扰(ISI),必须采用均衡技术消除ISI。迭代均衡技术(Turbo均衡)将信号检测技术和译码技术结合起来,比传统判决反馈均衡(DFE)技术具有更强抗ISI能力。研究了短波宽带波形Turbo均衡技术,提出了一种低复杂度的迭代检测方法用于短波宽带波形,仿真结果表明,在短波差信道条件下,Turbo均衡比DFE均衡的性能增益超过1.5 d B。
基金supported by the National Natural Science Foundation of China (60572093)Specialized Research Fund for the DoctoralProgram of Higher Education (20050004016)
文摘The single-carrier block transmission（SCBT）,a.k.a.,single-carrier frequency-domain equalization（SC-FDE）,is being considered as an option technique for the wireless personal area network（WPAN） operating at 60 GHz.It is found that for residential environment,in non-line-of-sight（NLOS） multi-path channels,the SCBT is much more effective to combat the inter-symbol interference（ISI） compared with orthogonal frequency division multiplexing（OFDM）.Low-density parity-check（LDPC） codes are a class of linear block codes which provide near capacity performance on a large collection of data transmission and storage channels while simultaneously admitting implementable decoders.To facilitate using LDPC codes for SCBT system,a new log-likelihood ratio（LLR） calculation method is proposed based on pilot symbols（PS）.Golay Sequences whose sum autocorrelation has a unique peak and zero sidelobe are used for creating the PS.The position and length of the PS are not fixed in the data blocks.The simulation results show that the proposed method can significantly improve the LDPC decoding performance in SCBT system.This is very promising to support ultra high-data-rate wireless transmission.
