802.11AD单载波链接，带有rf束的simulink链接金宝app

This example uses:

Open Model

This example shows how to model an IEEE 802.11ad™ single carrier link in Simulink® which includes a phased array antenna with RF beamforming. This example requires the following products:

WLAN Toolbox™用于基带发射器和接收器

Phased Array System Toolbox™ for receive antenna array

RF BANGLSET™用于RF接收器

Introduction

该模型模拟了802.11AD单载波（SC）[1] link with RF beamforming. Multiple packets are transmitted through free space, then RF beamformed, demodulated and the PLCP service data units (PSDU) are recovered. The PSDUs are compared with those transmitted to determine the packet error rate. The receiver performs packet detection, timing synchronization, carrier frequency offset correction and unique word based phase tracking.

MATLAB功能块允许Simulink模型使用MATLAB®函数。金宝app在此示例中，在Simulink中模拟的802.11AD SC链接使用WLAN工具箱函数，使用MA金宝appTLAB功能块。对于MATLAB中的802.11AD基带模拟，请参见示例802.11AD数据包错误率单载波PHY模拟使用TGAY通道（WLAN工具箱）。

System Architecture

该系统由：

A baseband transmitter which generates a random PSDU and an 802.11ad SC packet.
A free space channel.
A receive antenna array which supports up to 16 elements. This module allows control of the array geometry, number of elements in an array, operating frequency, and receiver direction.
A 16 channel RF receiver module to process the RF signals. This receiver module includes low noise amplifiers, phase shifters, Wilkinson 16:1 combiner, and a down-converter. This module allows control of the beamforming direction used to calculate the corresponding phase shifts.
A baseband receiver which recovers the transmitted PSDU by performing packet detection, time and frequency synchronization, channel estimation, PSDU demodulation, and decoding.

系统诊断包括显示均衡星座和获得的数据包错误率。

The following sections describe the transmitter and receiver in more detail.

基带发射器

基带发射机块创建一个随机的PSDU并编码位，以基于模型参数块中的MCS和PSDU长度值创建单个数据包波形。数据包生成器块使用该功能wlanWaveformGenerator（WLAN工具箱）to encode a packet.

RF Receiver

The RF receiver consists of amplifiers, phase shifters, Wilkinson 16:1 combiner and is implemented in superheterodyne fashion.

应用于每个元素的相移是根据波束成型方向计算的。这是由用户提供的，并指示主梁的方向。当接收器的主梁指向发射器时，接收器会最大化SNR。发射器是全向的，接收器方向（AZ，EL）指示入射信号的方向。显示了接收方向和波束形成方向的方案。在这种情况下，将降低接收的信号功率，导致高数据包错误率（PER）和误差向量幅度（EVM）。结果部分显示了这些值。

Baseband Receiver

The baseband receiver has two components: packet detection and packet recovery.

如果检测到数据包，则启用数据包恢复子系统可以处理检测到的数据包。

The packet recovery subsystem processing consists of the following steps:

频率偏移估计和校正。
Symbol timing and channel frequency response estimation.
Noise power estimation.
同步错误检查。这决定了数据包是否可以解码。
Packet decoding.

在数据包解码器子系统中，从同步接收的波形中提取SC数据字段。然后，使用提取的字段，通道和噪声功率估计来恢复PSDU。

Results

运行模拟显示数据包错误率。处理每个数据包后，该模型会更新Per。该模型还显示了均衡的符号星座以及EVM测量。请注意，对于统计上有效的结果，需要长时间的仿真时间。

By default, the main beam of the receive antenna array points towards the direction: azimuth = 0 deg. and elevation = 0 deg.

If you change theReceiver direction接收天线阵列的值朝向阵列中的接近零，EVM增加，数据包无法成功解码。

If you change the波束形成方向RF接收器中的值使主梁指向发射器，EVM的改进和数据包已成功解码。

Exploring the Example

尝试在模型参数块中更改信号与噪声比（SNR）值。增加SNR会导致较低的数据包错误率和提高均衡符号星座的EVM。如果使用单个接收链，则指定的SNR是ADC输入处的信号与噪声比。SNR解释了自由空间路径损失，热噪声和RF组件的噪声图。

您可以更改接收天线阵列块中存在的阵列中的阵列几何形状和元素数。增加天线元件的数量可改善EVM。可以在均衡符号星座中观察到接收器天线阵列引起的多样性增益。

附录

This example uses the following helper functions:

选定的参考书目

IEEE Std 802.11™-2020. IEEE Standard for Information Technology - Telecommunications and Information Exchange between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.