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| 1 | A low-complexity multiple signal representation scheme in downlink OFDM-CDMA显示文摘OFDM-CDMA is an attractive technique for broadband wireless communication. However, the high peakto-average power ratio (PAPR) of the downlink signals, generated from multiple spread codes, remains a serious problem. In this paper, a low-complexity multiple signal representation (MSR) scheme is proposed to control the PAPR problem in downlink OFDM-CDMA systems. The proposed scheme generates multiple candidate signals by a novel user grouping scheme, which is without distortion and can provide more PAPR reduction than the conventional MSR schemes, such as partial transmit sequence (PTS) and selective mapping (SLM). Furthermore, a low-complexity processing structure is developed using a novel joint spreading and inverse fast Fourier transform (S-IFFT) to simplify the generation of multiple candidate signals. Complexity analysis and numerical results show that the OFDM-CDMA systems employing the proposed scheme have better tradeoff between PAPR reduction and computational complexity, compared with the conventional MSR schemes. | DAN LiLin XIAO Yue CHENG Peng WU Gang LI ShaoQian | 2009 | Science in China(Series F)2009，52，12： | 1 |
| 2 | EDLC用分级孔炭电极材料的制备与超电容性能研究显示文摘采用有机-有机自组装法和化学活化法相结合,制备了分级孔炭电极材料(HPC)。氮气静态吸附测试表明,化学活化使介孔炭的孔壁上产生了大量的微孔,从而使其比表面积大大增加。与以硬模板法制备的有序介孔炭(OMC)相比,HPC比OMC具有更为优异的电化学性能,这是因为微孔和介孔直接相连的分级孔结构,不仅增大了比表面积,而且能够显著减小电解质离子在电极材料孔道内的扩散阻力。 | 司维江 邢伟 禚淑萍 | 2009 | 无机化学学报2009，25，7： | 1 |
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