SDR_Matlab_OFDM_802.11a

授权协议 MIT License
开发语言
所属分类 应用工具、 科研计算工具
软件类型 开源软件
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投 递 者 袁宜民
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SDR_Matlab_OFDM_802.11a

This simple OFDM demo is based on IEEE 802.11a OFDM format for testing SDR hardware.

Using Software Designed Radio (SDR) to transmit OFDM signals at 5 GHz.

Transmitter and Receiver hardware : Zedboard (Xilinx Zynq®-7000) + AD9361 (Analog Device-FMCOMMS3)

Hardware

Software needed :

  • Matlab R2016a
  • support package for Xilinx Zynq-Based Radio (R2016a version)

Before executing this code, please follow this tutorial to install support package for Xilinx Zynq-Based Radio in Matlab.

Code Structure :

Please open multiple Matlab windows to run Hardware_TX.m and Hardware_RX.m respectively.

Hardware_TX.m

TX_signal.mat

OFDM_TX.m

  • data_Payload_1.mat
  • data_Payload_2.mat
  • oversamp.m

Hardware_RX.m

OFDM_RX.m

  • Long_preamble_slot_Frequency.mat
  • setstate0.m

RX_test

  • RX.mat
  • RX2.mat

GUI :

  • GUI_TX

Program GUI_TX

  • GUI_RX

Program GUI_RX

Video Demo : https://www.youtube.com/watch?v=gNmMxtsWckwProgram GUI gif

System Model :

OFDM Block Diagram

Code Function :

Implemented

  • Data Signal Mapping
  • Packet Detection
  • Coarse/Fine Frequency Offset Estimation & Compensation
  • Channel Estimation & One-Tap Equalizer
  • Data De-Mapping

Not implemented yet

  • AGC (Auto Gain Control)
  • Fine Symbol Timing Estimation
  • Convolutional Decoding
  • De-Interleaving
  • Frame check calculation (It assumes every packet is the same length)

TX System Model

  • Short Preamble
  • Long Preamble
  • Payload
  • TX signal

TX RX Hardware Parameters

Center Frequency 5 GHz
Baseband Sample Rate (Bandwidth) 20 MHz
Ts (Sampling time) 50 ns
Samples Per Frame 3000
PC Host IP address 192.168.3.1
TX IP address 192.168.3.2
RX IP address 192.168.3.3

The way to change Hardware IP / Mac address

Edit newip.sh file in SD card

# Flush existing config
ip addr flush dev eth0
ip link set dev eth0 down
# Set up new config
ip addr add 192.168.3.3/24 dev eth0
ip link set eth0 address 00:0A:35:00:01:23
ip route add default via 192.168.3.1
ip link set dev eth0 up

Then, use router DHCP hand setting mode to distribute network configuration parameters :

Router setting

RX System Model

  • "Delay and Correlate" algorithm for Packet Detection
  • Packet Detection (normal case) , Threshold=0.75
  • Packet Detection (problem case & deselect the imperfect packet)
  • Coarse CFO Estimation & Compensation
  • Fine CFO Estimation & Compensation
  • Channel Estimation & Equalizer
  • 【实例简介】 整个802.11a协议的仿真,包括发射端和接收端,所有设置均严格按照协议标准 【实例截图】 【核心代码】 802.11a_OFDM_MATLAB └── 802.11a OFDM MATLAB ├── channel.m ├── create_freq_offset.m ├── get_bits_per_symbol.m ├── get_channel_ir.m ├── get_n_

  • 【实例简介】 802.11a标准编写的OFDM matlab程序,对初学者有用 【实例截图】 【核心代码】 8f422d022625 └── 802.11a OFDM MATLAB仿真代码!(推荐) ├── channel.m ├── get_bits_per_symbol.m ├── get_channel_ir.m ├── get_n_antennas.m ├── get_punc_param

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