摘要
OFDM因其子载波正交且频谱彼此重叠的信号形式,给非协作通信中针对OFDM信号特征参数盲处理带来了很大的困难。针对这个问题,系统地分析了OFDM信号的特性,包括幅度包络分布特性、时域周期性、频谱包络结构特性、子载波间隔及其正交特性、子载波调制独立性、频谱的谐频特性以及导频信号频域相关特性。通过对不同域特征的综合,利用了不同域特征属性间的互补信息,构建了一种新的OFDM信号特征集。给出了OFDM信号和其他典型宽带通信信号的特征参数分布对比结果,证明了该方法能够为OFDM信号的盲检测与识别提供较为完备的特征空间。
The OFDM Signal form is comparatively complicated due to the overlapping and orthogonality between various sub-carri- ers,which has brought the great difficulty in blind processing in non-cooperative communications such as making an analysis and extrac- ting of signal feature parameters. To solve the problem, the characteristics of the OFDM signal are analyzed,including amplitude envelop distribution, periodicity in time domain, spectrum envelop structural property, sub-carrier interval and orthogonality, sub-carrier modula- tion independence,harmonic frequency property and relativity of pilot signal in frequency domain etc. A new signal feature set has been built by combining different domain characteristics and using the complementary information of attributes between different domains. The new feature set has been proved to be effective by comparing the feature parameter distribution of OFDM signal with those of other typical wide-band communication signals ,so it can lay technique foundation for blind detection and recognition research of OFDM signal.
出处
《无线电通信技术》
2013年第3期1-6,共6页
Radio Communications Technology
关键词
自适应OFDM
特征分析
盲检测与识别
正交性
周期特性
谐频特性
adaptive modulation based OFDM system
feature analysis
blind detection and identification
orthogonality
periodicity
harmonic characteristic
