Some problems about components themselves are component interface, prefix condition, postposition condition, and unfunctional component impress such as reliability, resource requirement, timing requirement and so on. 其中和组件本身相关的一类问题是,组件接口、前置条件、后置条件、非功能性组件特征如可靠性、资源需求、时间需求等。
Existing research focus on the long cyclic prefix OFDM signal, identify the OFDM signal with a correlation algorithm in ideal Gaussian channel conditions, and the recognition rate is not high under the condition of low SNR, it can not meet the needs of practical applications. 而现有的研究集中对长循环前缀的OFDM信号,在理想高斯信道环境条件下,用相关算法来识别OFDM信号,并且在低信噪比条件下识别率不高,不能满足实际应用的需要。