【摘要】 物理层数据传输方案的选择是认知无线电(CR)技术能在实际中广泛应用的重要基础。给出了将SC-FDMA(单载波频分多址)技术应用于CR网络中的传输方案,并与传统的NC-OFDM(非连续的OFDM)技术进行分析比较。仿真结果和相应分析表明:在CR网络中,总体而言SC-FDMA的性能比NC-OFDM更为优良,特别是在严重的频率选择性衰落环境中,或者是当认知用户的可用频谱资源(子载波)比较稀少时,SC-FDMA的性能优势更加明显。因此SC-FDMA是一种很有前景的技术,在不久的将来有希望取代NC-OFDM,成为CR网络的物理层传输方案。更多还原

【Abstract】 The choice of data transmission scheme of physical layer is the important foundation to the application of Cognitive Radio(CR).Transmission scheme with Single Carrier Frequency Division Multiple Access (SC - FDMA) technology is applied to CR networks,which is compared with traditional Non - Contiguous Orthogonal Frequency Division Multiplexing(NC - OFDM) technology.The simulation results and the corresponding analysis demonstrate that the performance of SC - FDMA is generally better than NC - OFDM in CR networks,especially in frequency selective fading channel or when the available resource of frequency spectrum (subcarrier) is limited.Therefore,SC - FDMA could be a promising alternative to NC - OFDM in physical layer of CR networks.更多还原