分布式OFDM和FDM混合调制多载波传输技术研究

Distributed OFDM and FDM Hybrid Modulation Multicarrier Transmission Technology

OFDM与FDM同属频分复用技术。其中OFDM的频谱资源利用率高,但PAPR值也高,FDM没有PAPR问题,但频谱利用率低。分布式OFDM和FDM混合调制多载波传输技术,既可使系统获得较高的频谱利用率,又可以降低系统的PAPR值。加之调制上变频率呈分布式,调制频率间的空白间距可为多个OFDM模块带宽,既可使上变频间的影响最小,又能方便系统适应不同应用场景,为系统升级扩容提供方便。由于OFDM和FDM是成熟技术,实现难度较低,具有较强的实用价值。

OFDM and FDM belong to frequency division multiplexing technology.Among them,OFDM has high spectrum resource utilization,but the PARR value is also high,and FDM has no PAPR problem,but spectrum utilization rate is low.The distributed OFDM and FDM hybrid modulation multicarrier transmission technology can not only make the system obtain higher spectrum utilization rate,but also reduce the PAPR value of the system.In addition,the modulation frequency is distributed,and the gap between the modulation frequencies can be multiple OFDM module bandwidths,which can make the influence between the frequency conversion least and convenient.The system adapts to different application scenarios and provides convenience for system upgrade and expansion.Because OFDM and FDM are mature technologies,the implementation is difficult and has a strong practical value.