Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage networks.To overcome these disadvantages,a novel real-time d...Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage networks.To overcome these disadvantages,a novel real-time dynamic spectrum management(DSM) algorithm in orthogonal frequency division multiplexing(OFDM)-based high-speed narrow-band power line communication(HNPLC) systems is proposed,and the corresponding FPGA circuit is designed and realized.Performance of the proposed DSM is validated with a large amount of network experiments under practical PLC circumstance.As the noise in each narrow subcarrier is approximately Gaussian,the proposed DSM adopts the BER/SER expression formulized via the AWGN channel to provide a handy and universal strategy for power allocation.The real-time requirement is guaranteed by choosing subcarriers in group and employing the same modulation scheme within each transmission.These measures are suitable for any modulation scheme no matter the system criterion is to maximize data rate or minimize power/BER.Algorithm design and hardware implementation of the proposed DSM are given with some flexible and efficient conversions.The DSM circuit is carried out with Xilinx KC705.Simulation and practical experiments validate that the proposed real-time DSM significantly improves system performance.展开更多
动态频谱管理(Dynamic Spectrum Management,DSM)是提高频率选择性信道中系统传输有效性的最佳途径。文章基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)的高速窄带电力线通信(High-Speed Narrowband Power Line C...动态频谱管理(Dynamic Spectrum Management,DSM)是提高频率选择性信道中系统传输有效性的最佳途径。文章基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)的高速窄带电力线通信(High-Speed Narrowband Power Line Communication,HNPLC)系统设计了一种DSM硬件高效实现方法。使用分组决策和实时选用一种最优调制方式的方法有效降低了系统的信令开销和硬件实现复杂度,在完成DSM实用化的同时,确保了HNPLC系统的传输有效性。基于Xilinx KC705开发板和一个HNPLC物理层系统对DSM进行高效实现和在线实验验证,结果表明,所述DSM高效实现方法能有效保障系统的传输有效性,满足工程实用化需求。展开更多
基金Supported by the Tsinghua University International Science and Technology Cooperation Project(No.20133000197,20123000148)
文摘Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage networks.To overcome these disadvantages,a novel real-time dynamic spectrum management(DSM) algorithm in orthogonal frequency division multiplexing(OFDM)-based high-speed narrow-band power line communication(HNPLC) systems is proposed,and the corresponding FPGA circuit is designed and realized.Performance of the proposed DSM is validated with a large amount of network experiments under practical PLC circumstance.As the noise in each narrow subcarrier is approximately Gaussian,the proposed DSM adopts the BER/SER expression formulized via the AWGN channel to provide a handy and universal strategy for power allocation.The real-time requirement is guaranteed by choosing subcarriers in group and employing the same modulation scheme within each transmission.These measures are suitable for any modulation scheme no matter the system criterion is to maximize data rate or minimize power/BER.Algorithm design and hardware implementation of the proposed DSM are given with some flexible and efficient conversions.The DSM circuit is carried out with Xilinx KC705.Simulation and practical experiments validate that the proposed real-time DSM significantly improves system performance.
文摘动态频谱管理(Dynamic Spectrum Management,DSM)是提高频率选择性信道中系统传输有效性的最佳途径。文章基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)的高速窄带电力线通信(High-Speed Narrowband Power Line Communication,HNPLC)系统设计了一种DSM硬件高效实现方法。使用分组决策和实时选用一种最优调制方式的方法有效降低了系统的信令开销和硬件实现复杂度,在完成DSM实用化的同时,确保了HNPLC系统的传输有效性。基于Xilinx KC705开发板和一个HNPLC物理层系统对DSM进行高效实现和在线实验验证,结果表明,所述DSM高效实现方法能有效保障系统的传输有效性,满足工程实用化需求。
