瑞利衰落信道下认知无线电脉冲波形调制技术研究

Study on pulse shaping modulation scheme for cognitive radio under Rayleigh fading channel

提出一种用于瑞利衰落信道的认知无线电脉冲波形调制(PSM)方案。该方案采用多小波包滤波器组来构造正交脉冲,允许时域和频域的重叠,具有较高的灵活性和频带利用率,并可利用频率分集来提高抗衰落性能。仿真结果表明,基于多小波包的PSM方案不仅符合FCC模板的要求,而且具有比单小波方案更高的抗衰落性能。

This paper presents a pulse shaping modulation（PSM） scheme for cognitive radio under Rayleigh fading channel.An architecture of multiwavelet packet filter bank is used to produce orthogonal pulse,which can be overlapped both in time and frequency region.The system has high flexibility and effective spectrum utilization due to its multiplicity,and frequency diversity can be used to improve its anti-fading ability.The simulation results indicate that the PSM scheme using multiwavelet packet meets the power spectral mask of the Federal Communications Commission（FCC） and is more resistant to fading than the one with single wavelet.