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认知超宽带无线电自适应波形设计算法

DOI: 10.3969/j.issn.1006-7043.2009.12.014

Keywords: 超宽带 认知无线电 Parks-McClellan 陷波 窄带 共存 ultra-wideband cognitive radio Parks-McClellan spectral notch narrow band coexistence

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Abstract:

为了解决认知超宽带与窄带系统共存问题,实现认知超宽带无线电自适应波形设计,采用高斯函数的加权叠加作为认知超宽带脉冲波形.通过将波形设计问题转化为线性滤波器设计问题,采用Parks-McClellan算法进行求解,实现了任意中心频率和带宽陷波的波形设计.并进一步提出了利用权重值数组控制不同频带陷波深度的方法.仿真结果表明,所设计波形的功率谱密度在WLAN频段上可以实现约-30 dB的陷波,同时也可以实现多个频段陷波的波形设计.根据实际需要选择权重值可以控制各个频段的陷波的深度.

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