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中文摘要：
针对基于正交频分复用（OFDM）信号的认知无线电系统存在的子载波间干扰问题，提出了一种加深OFDM信号频谱凹槽的编码方法．该方法通过在相邻2个子载波上传输相同的信息，并将这2个子载波上传输的数据乘以一定的权值使其频谱凹槽处的边带能量相互抵消，达到降低特定频带功率的目的．理论分析和计算机仿真结果表明，本文方法不仅能加深频谱凹槽的深度，还具有很好的抗噪声性能．
英文摘要：
For the problem of intercarrier interference in orthogonal frequency division multiplexing （0FDM） signals of cognitive radio systems, a coding method for enhancing spectrum notch of OFDM signals is proposed. The same dates are transmitted on the two adjacent subcarriers, and then weight the dates on the two adjacent subcarriers to make their sidelobes cancel each other out at the frequency of spectrum notch, so as to reduce the power spectrum at specific frequency. Theoretic analysis and simulation results show that, not only the method can enhance the spectrum notch but also has a good performance of anti-noise.
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