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Sidelobe Suppression in OFDM-based cognitive radio systems

机译:基于DM的认知无线电系统中的Sidelobe抑制

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Orthogonal frequency division multiplexing (OFDM) suffers from significant out-of-band radiation due to high sidelobes of modulated subcarriers. In a cognitive radio (CR) system this effect results in high interference between secondary and primary users (PUs). Existing methods for reducing this interference have the drawbacks of significant data transmission rate reduction or power peak to average ratio (PAPR) growth. In this paper an adaptive optimal method is proposed that treats on OFDM signal in both time and frequency domains. Simulation results show that by using this algorithm, it is possible to achieve a high value of sidelobe suppression while the PAPR value of the transmitted signal is unchanged and the transmission rate reduction is lower than similar methods.
机译:正交频分复用(OFDM)由于调制子载波的高侧面引起的带有显着的带外辐射。在认知无线电(CR)系统中,这种效果导致辅助用户和主要用户(PU)之间的高干扰。降低该干扰的现有方法具有显着的数据传输速率降低或功率峰值与平均比率(PAPR)生长的缺点。本文提出了一种自适应最佳方法,其在两次和频域中对OFDM信号进行处理。仿真结果表明,通过使用该算法,可以实现高值的侧链抑制,而发送信号的PAPR值不变,传输速率降低低于类似的方法。

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