共查询到20条相似文献,搜索用时 843 毫秒
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在MPH(Minimum Path Cost Heuristic)和KMB算法的基础上,经过研究得到一种高效的MST(Multicast Steiner Tree)算法:时间复杂度为0(nlogn)的组播树生成算法,并在随机网络模型的基础上进行了仿真结果表明,新算法在付出空间代价的前提下换取了更快的计算速度,与其他组播树徨成算法相比,新算法是一种计算速度很快的算法。 相似文献
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在SPOTLIGHTSAR的各种成像算法中,聚焦的准确性是影响SAR成像质量的关键所在。在建立SPOTLIGHTSAR数据搜集及成像处理的数学模型基础上,比较了两种SPOTLIGHTSAR成像算法PFA和RMA的性能,并通过计算机仿真进行了分析和比较。 相似文献
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一种高速CMOS SRAM读出灵敏放大器的设计 总被引:1,自引:1,他引:0
提出了一种CMOS SRAM读出灵敏放大器的新结构。该放大器同传统的PMOS电流镜放大器和PMOS交叉耦合放大器相比,具有速度快、增益大、功耗小等特点,可广泛应用于SRAM的设计中。最后,用HSPICE的仿真结果证明了该设计的正确性及其优点。 相似文献
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MC68HC05SR3芯片介绍黄小平一、基本结构及特征MC68HC05SR3HOMOS微控制器是低功耗单片微控制器M68HC05家族的一员。这个S位的微控制器单元(MCU)包含有在片振荡器,CUP、RAMEOM、I/O,定时器及A/D。MC68HC0... 相似文献
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相位补偿是SAR/ISAR的关键技术。本文提出逐级逼近算法,基于图像评价函数,对SAR/ISAR中的随机干扰相位进行补偿。我们比较了四种典型的图像评价函数,仿真和实测数据的计算结果表明,逐级逼迫算法是一种有效的计算方法。同时,在四种图像评价函数中,以最小Shannon熵准则性能最好,它能确保对未知信号中干扰相位的正确估计。 相似文献
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一种改进的瞬变步长LMS自适应滤波算法 总被引:6,自引:0,他引:6
本文在PLMS算法的基础上提出了一种SPLMS的改进算法。除具有PLMS算法的优点外,它还具有更高的超始收敛速率,更小的权失调噪声,更大的抑制能力。计算机仿真效果较好,支持了理论分析。 相似文献
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本文研究了用距离-多卜勒(RD)算法来实现前斜视机载合成孔径雷达(SA)成象处理.给出了机载斜视SAR的空间几何模型和回波信号模型,详细分析了SAR在斜视情况下成象处理必须进行二次距离压缩(SRC)的机理,并研究了一种改进的SRC方法(SIM),此方法能适应于斜视角更大的情况.针对不同的斜视情况进行了计算机仿真,最后指出了RD算法处理斜视SAR的局限性及理由。 相似文献
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《Organic Electronics》2014,15(7):1509-1520
Ionization potentials (IP) and electron affinities (EA) of organic molecules with applications in photovoltaic devices are calculated using modern density functional theory (DFT). Calculated frontier orbital energies are compared to experimentally determined IPs and EAs at gas phase and thin film environments. Gas phase frontier orbital energies calculated with widely-used DFT functionals accidentally coincide with thin film measurements, reproducing condensed phase results for the wrong reasons. Recently developed range separated hybrid (RSH) functionals, on the other hand, provide gas phase frontier orbital energies that correspond properly to measured IPs and EAs. We also employ a polarizable continuum model to address the effects of the electrostatic environment in the solid state. We find that the environmentally-corrected RSH orbital energies compare well with thin film experimental measurements. 相似文献
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By using a double-sideband suppressed carrier (DSB-SC) optical transmitter and a remote self-heterodyned (RSH) detection method, we experimentally and analytically proved the feasibility of a radio-over-fiber system using a 16-QAM signal at 5 Gb/s and 18 GHz, with a transmission distance of 100 km between a mobile service center and a base station. The transmission system performance was carefully analyzed by considering optical amplifier noise, fiber nonlinearity, phase noise, frequency response, and analog-to-digital converter (ADC) quantization noise. The 18-GHz, 16-QAM signal can be radiated from the base station to a remote antenna port without any upconverter, and the remote antenna port consists of a downconverter and high-speed digital signal processors (DSPs) to recover the 16-QAM signal. The high-speed DSP, which partially compensates the intersymbol-interference (ISI) and phase-noise-induced system penalties, was enabled by 20-Gs/s ADCs. The algorithms used in the DSP blocks were also described in details. 相似文献
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The “weighted vertices” (WV), an alternative in solving the biomagnetic forward problem (BFP) for a realistically shaped head (RSH) model are presented. This proposed approach differs from the others in the way some terms in the governing integral equations are defined. The effects that WV has on important issues such as the “auto solid angle” and “stability of equations” are discussed. Two variants of the WV approach, i.e., the “linear weight” and the “quadratic weight”, have been developed, and comparison of results produced by these two approaches shows that the implementation of quadratic elements to evaluate the integral produces significant improvements. This study is done with a focus on magnetic rather than electric phenomena, so a homogeneous conductor has been used in the numerical example. However, the thoughts behind this proposed method can be easily extended for cases where inhomogeneous conductors are involved. Significant improvement in the accuracy of the forward problem has been observed by use of the WV approach 相似文献
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提出了一种新型灵敏放大器,电路由单位增益电流传输器、电荷转移放大器及锁存器三部分组成。基于0.18μm标准CMOS单元库的仿真结果表明,与现有几种灵敏放大器相比,新型灵敏放大器具有更低的延时和功耗,在1.8 V工作电压、500 MHz工作频率、80μA输入差动电流以及DSP嵌入式SRAM6T存储单元测试结构下,每个读周期的延迟为728 ps,功耗为10.5fJ。与电压灵敏放大器相比,延迟减少约41%,功耗降低约50%;与常规电荷转移灵敏放大器相比,延迟减少约22%,功耗降低约37%;与WTA电流灵敏放大器相比,延迟减少11%,功耗降低31.8%。 相似文献
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随着GPRS/UMTS网络的即将投入商用和Internet网络及其业务的飞速发展 ,如何将这两种通信网络进行合理的融合以利用两者的不同优势实现更加快捷方便的网络服务越来越受到包括网络运营商 ,设备供应商乃至理论研究界的广泛关注。本文就这一课题详细介绍了目前通信业界的最新相关研究成果 ,并讨论了MIP技术在这一融合过程中的积极应用。 相似文献