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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。
Existing MB-OFDM schemes use fixed length zero prefix (ZP) to resist ISI and ICI caused by multipath effects and can not adapt to changes in the environment. In order to ensure the transmission efficiency and effectiveness of the system in different environments, a variable length ZPMB-OFDM system is proposed. The inter-symbol interference and intersymbol interference caused when ZP is less than the maximum delay spread are analyzed. For the four standard multipath channel environments of UWB system, the performance of ZP for MB-OFDM system performance and efficiency Influence; proposed three variable length ZPMB-OFDM scheme. The simulation results show that ZPMB-OFDM system with variable length can ensure the reliability and transmission efficiency in different communication environments and improve the flexibility of system design.