摘要
提出一种新的基于离散余弦变换(Discrete cosin transform,DCT)及其逆变换的离散多音调制系统实现方案,利用IDCT/DCT变换替代IFFT/FFT变换实现多载波信号的调制与解调,并对该系统的峰均功率比(Peakto average power ratio,PAPR)进行了理论分析。在此基础上,提出一种利用离散余弦变换能量集中特性降低系统PAPR的方法,与基于选择性映射算法的离散多音调制系统(SLM-FFT-DMT)相比,基于DCT的DMT系统比SLM-FFT-DMT系统的PAPR低1.5dB,且具有计算法复杂度低的优点。
A new scheme based on discrete cosine transform （DCT） and its inverse is proposed to realize the discrete multitone modulation （DCT-based-DMT） system. IDCT/DCT is used to construct the DMT system by replacing the IFFT/FFT transform to complete multi-carrier modulation. Then, the peak to average power ratio （PAPR） performance of the proposed sys-tem is analyzed. Based on these results, an energy compressional DCT algorithm is proposed to reduce the PAPR of DCT-based-DMT system. Compared with the DMT system based on theselected mapping algorithm （SLM-FFT-DMT）, the proposed DCT-based-DMT system with DCT algorithm provides 1.5 dB PAPR reduction and lower complexity.
出处
《数据采集与处理》
CSCD
北大核心
2012年第2期168-172,共5页
Journal of Data Acquisition and Processing
基金
国家重点基础研究发展计划("九七三"计划)(2007CB10605)资助项目
国家自然科学基金(60972054
61101223)资助项目
关键词
离散多音调制
峰均功率比
离散余弦变换
互补累计概率函数
discrete multitone modulation
peak to average power ratio
discrete cosine trans- form
complementary cumulative distribution function
