平衰落 meaning in English
flat fading
Examples
- While this dissertation will use wavelet analysis to decompose fading - process , and provide wavelet model of flat fading channel , then propose a new blind receiver based on monte carol algorithm
本文将平衰落信道的衰落过程进行小波分解与建模，在此基础上提出一种采用顺序蒙特卡罗算法的盲均衡接收机，并给出了仿真结果以证明此接收机的优异性能。 - To verify their effectiveness , simulation studies are conducted to test the performance of the proposed turbo codes in awgn channels and flat fading channels . in these simulations , the modified max - log - map decoding algorithm and the golden - spread interleaver are applied
仿真研究了采用优选扩散交织与改进的max - log - map译码算法的turbo码在加性白高斯噪声( awgn )信道以及平衰落信道上的性能。 - And then facing the problem of the channel estimation of the adaptive modulation system , we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail . to meet flat fading channel , we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length . the conclusion can be drawn from these results
接着，对自适应调制系统中的信道估计问题难点，详细推导了平衰落信道条件下和选择性衰落信道条件下最大似然( ml )估计和最大后验概率( map )估计算法，针对平衰落信道，我们仿真了map估计和ml估计的方差与导频符号长度的关系，仿真结果表明，错误方差受多谱勒频率的变化影响最大，并且对实际的自适应调制系统，导频符号长度的取值超过20个符号长度时， map信道估计明显优于ml信道估计。 - Adaptive modulation mainly include several problem for example signal shape , channel estimation , all digital receiver and so on . since the channel referring to adaptive modulation is very hostile in wireless transmission channel , its algorithms and architectures used for the modulation and demodulation should be carefully devised and considered . designing appropriate algorithms and architectures of the adaptive modulation are main research goal of this paper to meet the need of flat fading channel and selective fading channel
自适应调制技术主要包括信号成形、信道估计和检测、全数字接收等方面的问题，由于自适应调制所涉及的信道是非常恶劣的无线传输信道，其调制与解调的算法和结构必须加以精心的设计和考虑，针对具体所假设的平衰落和选择性衰落的无线信道情况来设计自适应调制系统的算法和结构是本文研究的主要方向。 - In this part , the two anterior chapters mainly discuss the various basic theories used by the designing for the propagation paths of the electric wave . the theories include the computation methods for the fade and the loss of various propagation paths and obstructions , the engineering estimation methods of the flat fading and frequency selected fading , the designing methods of space diversity and frequency diversity , etc . at the same time , the special designing method of the sea - across path is discussed in detail
本文首先阐述了微波中继通信工程设计中的相关知识，其中前两章主要论述了线路设计中所用到的种种理论基础知识，包括对于各种路径情况、障碍情况的衰落与损耗的不同计算方法，平衰落与选择性衰落中断率的估算方法，天线分集和频率分集技术的理论知识和设计方法等等。