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
随着测井新理论和新方法的不断出现,传统的测井通信技术已成为制约测井技术发展的瓶颈。如何在有限的带宽范围内获取更大的数据传输速率和传输距离已成为测井通信研究的重点。以石油测井井下环境为背景设计出一套基于电力线OFDMA(Orthog...随着测井新理论和新方法的不断出现,传统的测井通信技术已成为制约测井技术发展的瓶颈。如何在有限的带宽范围内获取更大的数据传输速率和传输距离已成为测井通信研究的重点。以石油测井井下环境为背景设计出一套基于电力线OFDMA(Orthogonal Frequency Division Multiple Access)载波技术的单芯电缆测井通信系统。系统采用基于OFDMA技术的电力线载波通信芯片SM2200完成井下仪器与地面仪器间的宽带数据传输,使得测井通信变得更加高效、可靠、经济。展开更多
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.
文摘随着测井新理论和新方法的不断出现,传统的测井通信技术已成为制约测井技术发展的瓶颈。如何在有限的带宽范围内获取更大的数据传输速率和传输距离已成为测井通信研究的重点。以石油测井井下环境为背景设计出一套基于电力线OFDMA(Orthogonal Frequency Division Multiple Access)载波技术的单芯电缆测井通信系统。系统采用基于OFDMA技术的电力线载波通信芯片SM2200完成井下仪器与地面仪器间的宽带数据传输,使得测井通信变得更加高效、可靠、经济。
