Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m Platform: |
Size: 1024 |
Author:福东方 |
Hits:
Description: this code is for Wimax(ieee standard 802.16) and other ofdm based transmitter and makes preamble for their training frames to make synchronization easier. Platform: |
Size: 1024 |
Author:amin |
Hits:
Description: MATLAB环境下基于OFDM系统的前导序列中短训练序列的误差估计仿真程序-the offset of the short training sequence of preamble Platform: |
Size: 1024 |
Author:xiahxp |
Hits:
Description: MATLAB环境下基于OFDM系统的前导序列中短训练序列的误差估计仿真程序-the offset of the long training secquence of preamble Platform: |
Size: 1024 |
Author:xiahxp |
Hits:
Description: 基于能量差分的ofdm帧同步算法matlab程序，可以运行-OFDM frame synchronization based on energy difference of the received preamble，can run Platform: |
Size: 1024 |
Author:邢昊 |
Hits:
Description: IFFT 基于matlab实现，可用于OFDM前导训练序列的生成-IFFT OFDM preamble training sequence can be used to generate based on matlab implementation Platform: |
Size: 1024 |
Author:过半年 |
Hits:
Description: Frequency Synchronization in OFDM System
An accurate frequency synchronization method using the zadoff-chu (ZC) constant envelop preamble is analyzed, and a new preamble weighted by pseudo-noise sequence is used for orthogonal frequency division multiplexing (OFDM) systems. Using this method, frequency offset estimator range is greatly enlarged with no loss in accuracy. The range of the frequency estimation is ±30 of subcarrier spacing using ZC sequence as preamble. Simulations in the MATLAB for an AWGN channel show that the proposed method achieves superior performance to existing techniques in terms of frequency accuracy and range. Platform: |
Size: 349184 |
Author:Mohamed |
Hits:
Search - OFDM matlab preamble