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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 电气工程代写|通讯系统作业代写communication system代考|Multiple-Input Multiple-Output Systems

In the recent past, the demand for data rate is met with the help of Multiple-Input Multiple-Output (MIMO) systems. MIMO technique exploits the space dimension. Using MIMO technology, capacity of the channel and the spectral efficiency can be improved. This also helps to improve the reliability of the communication medium. MIMO is implemented by deploying Many co-located antennas at the receiver side or/and transmitter side. The key idea behind diversity is that each antenna receives different faded signal and the probability of all of them in deep fade is less. Thus spatial diversity schemes improve reliability by reducing channel fluctuations due to fading.

Figure 8 shows the schematic of $\mathrm{THz}$ channel with receiver diversity where multiple antennas are deployed at the receiver side.
The signal received at $i$ th antenna at the receiver side is given by
$$y_i=h_i x+n_i$$
In general form,
$$Y=H X+N$$
where
$Y=\left[y_1 y_2 \cdots y_{N r}\right]^{\mathrm{T}}$ is the vector consists of received signal from all antenna.
$H=\left[h_1 h_2 \cdots h_{N r}\right]^{\mathrm{T}}$ is the vector consists of the channel seen by each antenna. $N=\left[n_1 n_2 \cdots n_{N r}\right]^{\mathrm{T}}$ is the vector of noise on the received signal.

The signal received through each antenna can be combined effectively using various combining techniques. Maximum Ratio Combining (MRC) is the commonly used technique which is optimal in terms of SNR. The transmitted symbol is estimated using,
$$\hat{x}=\frac{H^H Y}{H^H H}$$

## 电气工程代写|通讯系统作业代写communication system代考|Antenna Design

The bandwidth of the $\mathrm{THz}$ channel is too high and this can support the growing demand of high data rate. The antenna that is used at $\mathrm{THz}$ communication should have wider bandwidth. The directivity of the antenna plays an important role in mitigating the distance constraint due to excessive path loss. Properties of the material are vital in deciding the performance of antenna. Therefore, the impact of material properties might be an interesting area to study further. These two needs can be achieved using graphene-based huge antenna arrays. Surface plasmon polaritons (SPP) waves can propagate at $\mathrm{THz}$ frequency with graphene as a material used for antenna design. The velocity of SPP wave in graphene is almost twice compared to the velocity in vacuum. Graphene outperforms copper and carbon nanotubes when it comes to designing antennas with small footprints and great directivity [6]. Nanoelectronic device can employ antenna array made up of graphene for communication. Graphene also enables the creation of reconfigurable directional antennas in addition to SPP wave propagation. Plasmonic patch antenna based on graphene, a reconfigurable graphene-based Yagi-Uda MIMO antenna, and planar antennas are some of the THz antennas which are studied and explored. Antenna with superstate layers are also explored in $\mathrm{THz}$ region to obtain multiple bands.

To counteract the path loss incurred at $\mathrm{THz}$ frequencies, a large antenna gain is required, and this can be achieved with large antenna array [7]. Although printed antennas can be used to create a huge antenna array construction, mutual coupling is one of the key concerns in such antenna. Although there is a substantial amount of study on mutual coupling reduction in the literature, it demands special attention in the $\mathrm{THz}$ domain.

# 通讯系统代考

## 电气工程代写|通讯系统作业代写communication system代考|Multiple-Input Multiple-Output Systems

$$y_i=h_i x+n_i$$

$$Y=H X+N$$

$Y=\left[y_1 y_2 \cdots y_{N r}\right]^{\mathrm{T}}$ 是向量由来自所有天线的接收信号组成。
$H=\left[h_1 h_2 \cdots h_{N_r}\right]^{\mathrm{T}}$ 是矢量由每个天线看到的通道组成。 $N=\left[n_1 n_2 \cdots n_{N_r}\right]^{\mathrm{T}}$ 是接收信号上的㖏声向量。

$$\hat{x}=\frac{H^H Y}{H^H H}$$

## 有限元方法代写

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

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