首页>
外国专利>
Adaptive symbol transition method for OFDM-based cognitive radio systems
Adaptive symbol transition method for OFDM-based cognitive radio systems
展开▼
机译:基于OFDM的认知无线电系统的自适应符号转换方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Modulated orthogonal frequency division multiplexing (OFDM) subcarriers generate high sidelobes, resulting in adjacent channel interference (ACI). Current sidelobe suppression techniques, such as inserting guard intervals or cancellation carrier bands, diminish the useful radio spectrum or consume significant wireless device resources. Disclosed is a method of suppressing sidelobes through adding an adaptive extension to OFDM symbols that is calculated to avoid ACI while keeping power consumption to low levels. Bandwidth and user location information are collected by a cognitive radio an utilized to determine the extension used. The method significantly reduces ACI to other bands and reduces the required guard bands, opening the radio spectrum to more efficient use.
展开▼