查询词典 fading

Under the assumption that the channel state information was available only at the receiver,the capacity of MIMO systems in Rayleigh fading channel was investigated on the basis of information theory. Three special expressions for the MIMO capacity over ergodic flat fading channel were derived.An asymptotic formula for MIMO systems with equal number of transmit and receive antennas in small SNR was also given. Simulation results show that this approximation is relatively accurate.

以信息论的观点为基础，在假设信道状态信息仅收端已知的情况下，采用等功率发射方案，研究了瑞利衰落信道下MIMO系统各态历经信道容量，推导了三种特殊MIMO信道的各态历经信道容量表达式，以及在小信噪比下等收发天线MIMO系统的容量近似公式，并通过仿真进行了验证，仿真结果表明该近似公式比较精确。

Our research work concentrates on the severe communication circumstances, for example, spatially correlative and time-frequency selective fading channel, and focuses on the design of codec for space-time architecture and the utilizing of linear precoding technique especially on the multiuser scenario trying to improve the system performance to combate various fading.

论文首先基于已有空时相关MIMO信道模型，分析给出了联合空时互相关函数解析表达式，并推导给出了空时分组编码传输方案理论成对错误概率表达式。

It contains: a continuous guide frequency generating module to generate DPCCH non-guide frequency emission estimation value according to input DPCCH de-spread signal and guide frequency emission signal, and combine the estimation value with the DPCCH guide frequency emission signal to generate continuous guide frequency; an average fading factor generating module to generate average fading factor of each DPCCH code according to the input continuous guide frequency and DPCCH de-spread signal; a demodulation signal generating module to generate DPCCH and DPDCH demodulation signals according to the input average fading factors and DPDCH and DPCCH de-expanding signals at the corresponding time.

这种码分多址通信系统的信号解调装置包含：连续导频产生模块，用于根据输入的DPCCH解扩信号以及导频发射信号，产生DPCCH非导频段发射估计值，并将所述DPCCH非导频段发射估计值与所述DPCCH导频发射信号合并，产生连续导频；平均衰落因子产生模块，用于通过输入的所述连续导频以及DPCCH解扩信号，产生DPCCH各个码元的平均衰落因子；解调信号产生模块，用于通过输入的所述DPCCH各个码元的平均衰落因子，以及对应时刻的DPDCH解扩信号和DPCCH解扩信号，产生DPCCH和DPDCH解调信号。

But for Irkutsk to the Great Wall Station circuit,there is little relationship between the fading depth and frequency.It seems that the relationship between fading depth and frequency is controlled by the factors such as location,distance etc.

但依尔库茨克－南极长城站电路的衰落深度与频率、时间无关，说明衰落深度与频率、时间的关系还要受距离、位置等因素的影响。

Firstly, the Signal Noise Ratio characteristic of matched filter despread symbol and the distribution of coherent phase estimation error are derived. Secondly, the exact integration formula of BER for fading channel is presented, moreover, by using the Maclaurin series expansion of MPSK conditional Symbol Error Rate, the simplified BER approximations for BPSK and QPSK are derived over AWGN, Nakagami-m fading and Rayleigh fading channel.

首先推导了匹配滤波解扩符号的信噪比特性和相干相位估计误差的分布；然后给出了衰落信道中误比特率的精确积分式，并利用MPSK条件误符号率的麦克劳林级数形式，推导了AWGN，Nakagami-m衰落和瑞利衰落信道中BPSK，QPSK误比特率的简化逼近式。

A phase angle of the fading vector which is subjected to the weighted-averaging is compared with a phase angle of the fading vector which is subjected to the weighted-averaging calculated previously.

受到加权平均的衰减矢量的相位角被与受到预先计算的加权平均的衰减矢量的相位角相比较。

Results show that it is conditional that amplitude is Raleigh fading orRician fading.

仿真分析了多路径信号的包络和相位的概率分布。

In frequency selective fading channels, different channel has different fading, that is to say, different channel has different transmission quality.

在频率选择性衰落信道中，不同的子信道受到不同的衰落，也就是说有不同的传输质量。

In the field of visible photosensitive resin, the absorption spectrum, excited state, solvent polarity effect, fluorescence spectrum, fluorescence quenching, concentration effect, photo fading, reaction mechanism as well as photopolymerization kinetics of xanthene iodonium salts and cyanine dye-borate were discussed. It is found that under the radiation of visible light, intra-ion-pair electron transfer reactions occur in bis salt of fluorescein and unsymmetrical trimethine cyanines containing quinoline end group triphenyl-butylboron, and the fading rate is very high.

在可见光敏树脂部分，通过对呫吨染料碘鎓盐和菁染料-硼盐体系的吸收光谱性质、激发态性质、溶剂极性效应、荧光光谱、荧光猝灭、浓度效应、光褪色反应、光聚合动力学等的研究，结果发现：荧光黄双二苯基碘鎓盐体系和含喹啉环端基不对称三甲川菁染料-三苯基丁基硼盐体系在可见光作用下均发生离子对内电子转移反应，且光褪色反应速率很高。

Doppler frequency offsets in rapid mobile environments result in both the fast fading of radio channels and intercarrier interference in Orthogonal Frequency Division Multiplexing systems. In order to combat the impact of ICI on OFDM systems in fast fading channels, an ICI mitigation technique is proposed in this paper.

针对高速移动环境下多普勒频偏造成移动信道的快衰落和正交频分复用系统中子载波间干扰问题，提出了一种适合快衰落环境的OFDM系统子载波间干扰抑制算法。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。