以正交频分复用(orthogonal frequency division multiplexing,OFDM)调制为基础的宽带电力线通信技术,为智能电网、智能家居以及"最后一公里"提供了高效可靠的信息传输方案,然而OFDM对同步错误极度敏感,针对此问题,采用多相...以正交频分复用(orthogonal frequency division multiplexing,OFDM)调制为基础的宽带电力线通信技术,为智能电网、智能家居以及"最后一公里"提供了高效可靠的信息传输方案,然而OFDM对同步错误极度敏感,针对此问题,采用多相序列作为主同步信号的多用户帧结构,利用一种新的多相序列族(用于用户群搜索)作为主同步信号,序列族的设计不仅要考虑每个序列都有更优良的自相关特性即更高的峰值对旁瓣峰值比,还要求有很好的互相相关特性以对抗其他用户训练序列引起的用户间干扰。多用户系统中不同用户采用不同的序列作为同步序列,这种方法对系统的复杂性没有任何影响。在作者自制的硬件平台上实现了该算法,实验和仿真结果均表明该同步设计更适用于电力线环境。展开更多
In this paper, a multicarrier DS-CDMA system which employs Z-Complementary Se- quences (ZCS) as spreading code is investigated. The new system can not only eliminate multipath interference and Multiple Access Interfer...In this paper, a multicarrier DS-CDMA system which employs Z-Complementary Se- quences (ZCS) as spreading code is investigated. The new system can not only eliminate multipath interference and Multiple Access Interference (MAI), but also support flexible number of users com- pared with system using Orthogonal Complementary (OC) codes. Multicarrier DS-CDMA using OC codes can be regarded as a special case of our proposed system. Zero Correlation Zone (ZCZ) of ZCS can be flexibly adjusted to meet the requirements on the user number and maximum multipath and in- ter-user delay, in this way, more users can be supported without losing interference-free property. The effectiveness of the proposed system is validated through theoretical analysis and simulation results.展开更多
文摘以正交频分复用(orthogonal frequency division multiplexing,OFDM)调制为基础的宽带电力线通信技术,为智能电网、智能家居以及"最后一公里"提供了高效可靠的信息传输方案,然而OFDM对同步错误极度敏感,针对此问题,采用多相序列作为主同步信号的多用户帧结构,利用一种新的多相序列族(用于用户群搜索)作为主同步信号,序列族的设计不仅要考虑每个序列都有更优良的自相关特性即更高的峰值对旁瓣峰值比,还要求有很好的互相相关特性以对抗其他用户训练序列引起的用户间干扰。多用户系统中不同用户采用不同的序列作为同步序列,这种方法对系统的复杂性没有任何影响。在作者自制的硬件平台上实现了该算法,实验和仿真结果均表明该同步设计更适用于电力线环境。
基金Supported by the National Natural Science Foundation of China (No.60772087, No.90604035)111 Project (No.111- 2-14)
文摘In this paper, a multicarrier DS-CDMA system which employs Z-Complementary Se- quences (ZCS) as spreading code is investigated. The new system can not only eliminate multipath interference and Multiple Access Interference (MAI), but also support flexible number of users com- pared with system using Orthogonal Complementary (OC) codes. Multicarrier DS-CDMA using OC codes can be regarded as a special case of our proposed system. Zero Correlation Zone (ZCZ) of ZCS can be flexibly adjusted to meet the requirements on the user number and maximum multipath and in- ter-user delay, in this way, more users can be supported without losing interference-free property. The effectiveness of the proposed system is validated through theoretical analysis and simulation results.
