摘要
现有MB-OFDM方案采用固定长度的零前缀(ZP)抵抗多径效应带来的符号干扰(ISI)和载波间干扰(ICI),无法适应环境的变化。为了保证系统在不同环境下的传输效率和有效性,提出了变长ZPMB-OFDM系统。对ZP小于最大时延扩展时带来的符号间干扰和码间干扰进行了分析;针对UWB系统的四种标准的多径信道环境,研究了ZP的长度对于MB-OFDM系统的性能和效率的影响;提出了三种变长ZPMB-OFDM方案。仿真表明变长ZPMB-OFDM系统能保证在不同通信环境下的可靠性和传输效率,提高了系统设计的灵活度。
The present MB-OFDM scheme uses a fixed-length Zero-Prefix （ZP） to resist Inter-Symbol Interferences and Inter-Carrier Interferences. However, it could not adapt to the changing environment. To ensure the efficiency and effectiveness of the MB-OFDM system, an adaptable ZP MB-OFDM system is proposed. Firstly, the ISI and ICI caused by insufficient ZP are analyzed, then the influence of ZP length on MB-OFDM system performance and efficiency is investigated in four UWB standard channel scenarios, and three adaptive ZP schemes are proposed. Simulation result shows that the adaptive ZP MB-OFDM system could maintain the its robustness and efficiency in the different evironments, and provide extra flexibility for the system design.
出处
《通信技术》
2010年第2期54-56,59,共4页
Communications Technology
基金
国家自然科学基金资助项目(No.60702020)
河南省重点科技攻关项目(No.0623051400)
