time-invariant channel

Secondly, introduce discrete multi-tone modulation principle in detail, have a systemic and comprehensive analysis and explanation on minimum mean square error ( MMSE) channel shorten time domain equalizer design methods which are based on all kinds of cost functions, analyze their advantage and disadvantage.

详细介绍离散多音频调制原理，对MMSE信道缩短法和基于其他代价函数的时域均衡器设计方法的进行了系统全面的分析和阐述，分析了各自的优缺点；

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In chapter four and five, the author generalizes this method to MIMO case for time-invariant and time-variant MIMO channel estimation respectively.

在本文的四、五两章中，作者将这种思想推广到MIMO情形，对FIR时变/时不变信道分别进行估计。

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According to different channel models, CDMA systems can be divided into additive white gaussian noise ( AWGN) channel and dispersive channel, time-variant and time-invariant channel.

CDMA系统按信道模型的不同分为高斯白噪声信道和衰落信道、时变和时不变信道。

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If the communication data rate is up to kbps, it can be regarded as a time-invariant channel.

当通信速率达到kbps数量级及以上时，可以作为时不变信道处理。

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The major works of this paper can be summarized as follows: ( 1) On the basis of time-invariant modeling for OFDM, an improved algorithm based on Superimposed Pilot that suit to time-invariant channel estimation has been proposed.

其主要工作概括如下：（1）在时不变环境条件下OFDM系统的模型的基础上，提出了一种基于叠加导频的时慢变信道估计算法。

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To avoid using a long CP, a time domain equalizer was used to shorten the length of the channel impulse response.

为了避免使用较长CP，通常在接收端采用时域均衡缩短信道冲激响应长度。

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METHODS: The head was simplified to a two-layer conductive sphere and the single measurement channel of MIT was approximated to an axial symmetric electromagnetic model. The analytical solution of the model was deduced from analysis method of time harmonic electromagnetic field.

方法：将头颅近似为一个双层的导电球体，脑MIT单通道测量系统近似为由测量、激励线圈和球体组成的轴对称模型，采用时谐电磁场分析方法，推导出轴对称模型的解析解。

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Analysis of Channel Multilayer Waveguides with the Two Dimensional Finite Difference Time Domain Method

用二维时域有限差分法分析条形多层波导

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We classify these existing channel estimation algorithms into two categories: frequency domain processing methods and time domain processing methods, and make detailed analysis and comparison between them.

我们将基于频域导频的信道估计算法分为频域估计算法和时域估计算法两类，对它们各自的技术优点和缺陷进行了分析和比较。

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