Computer Engineering and Applications ›› 2013, Vol. 49 ›› Issue (3): 113-115.
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KE Kai, RUI Guosheng, LING Qing
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柯 凯,芮国胜,凌 青
Abstract: A new joint method is proposed to reduce the peak-average power ratio of wavelet packet modulation signals. Base-band signal is coded with low-density parity-check code, and constellation mapping and wavelet packet modulation are gone through. The wavelet packet modulated signal is clipped to reduce the peak-average power ratio, which is transferred to the frequency domain and filtered to restrain the out-of-band radiation and is transferred back to the time domain to be up-converted and transmitte. The simulation outputs indicate that this new joint method is able to reduce the peak-average power ratio and improve the bit error ratio of the system.
Key words: wavelet packet modulation, peak-average power ratio, low-density parity-check code, clipping
摘要: 为了解决小波包调制的峰均功率比过高的问题,提出了一种联合降低峰均功率比的方法。用低密度奇偶校验码对信号进行编码,对编码信号进行星座映射和小波包调制,对得到的小波包调制信号进行限幅以降低信号的峰均功率比,变换到频域进行滤波以减小带外辐射,将信号变换回时域进行上变频传输。仿真结果表明,这种联合方法在降低了PAPR的同时提高了系统的抗噪性能。
关键词: 小波包调制, 峰均功率比, 低密度奇偶校验码, 限幅法
KE Kai, RUI Guosheng, LING Qing. Joint method of PAPR reduction of WPM system[J]. Computer Engineering and Applications, 2013, 49(3): 113-115.
柯 凯,芮国胜,凌 青. 降低小波包调制PAPR的联合方法[J]. 计算机工程与应用, 2013, 49(3): 113-115.
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http://cea.ceaj.org/EN/Y2013/V49/I3/113