基于SC-FDMA的认知无线电网络的研究

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。

Research on Cognitive Radio Networks Based on SC- FDMA Technology

The choice of data transmission scheme of physical layer is the important foundation to the applica- tion 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 ahemative to NC -OFDM in physical layer of CR networks.