什么是OFDM?
OFDM是一种数字传输方案,通常用于WiFi,LTE和5G等标准。发现如何使用MATLAB的函数和应用程序构建,测试和分析符合标准的OFDM波形®,S万博1manbetximulink®, and wireless communications toolboxes. Learn how OFDM signals are generated, transmitted, and received as part of a wireless communications system. Implement your OFDM algorithms onto FPGAs and ASICs using HDL Coder™ and Wireless HDL Toolbox™.
正交频道多路复用或OFDM是一种流行的数字传输方法。OFDM在多个频带上传输信号,并在许多常见的无线通信标准(例如Wi-Fi,LTE和5G)中广泛使用。在此视频中,我们将查看OFDM以及如何生成OFDM信号。我们还将研究接收器的信号如何处理。我们将讨论OFDM现代无线标准的重要性。最后,我们将展示如何使用MATLAB,SIMULINK和无线通信产品来构建,测试和分析DM万博1manbetx平台作为您的无线通信系统设计的一部分。s manbetx 845
OFDM is a spectrally efficient transmission method which allows you to send a large amount of data within a given bandwidth. In OFDM, data streams are mapped to signal components called sub-carriers, which are overlapping equally spaced complex sinusoids. The sub-carriers are orthogonal to one another, so that at the center of each sub-carrier the signal contribution from the other carriers is 0. OFDM wave form generation at the transmitter involves several key components. The information comes from higher layers as a bit stream. It is then encoded and modulated into symbols using a modulation mapper such as QPSK or QAM.
然后将智商样品在二维资源网格中对齐。Y维表示频域,而X维表示时间。接下来,将逆快速傅立叶变换或IFFT应用于资源网格以创建OFDM符号。然后将循环前缀添加到每个OFDM符号的前面。循环前缀在OFDM符号中采用最后一组样品,并将其移动到前面。在每个OFDM符号中添加一个循环前缀,大大简化了接收器的均衡操作。试点样品(也称为参考信号)是OFDM解调中的重要元素。
飞行员资源组的符号是一个元素,but there are other elements as well. In the following resource grid, the reference signals are represented by the white rectangles. These reference signals are known data that are inserted periodically in time and frequency to help with the channel estimation and equalization later in the receiver. At the receiver, the reference signals are first recovered then used to estimate the channel. This channel can then be used to equalize the received symbols. In OFDM, equalization reduces to a complex scalar multiplication. After equalization, we obtain a modulated symbols which are then demodulated and decoded to yield our original data raw bits.
There are many reasons why OFDM is one of the most widely used digital transmission schemes. OFDM is very robust at handling signals in environments with lots of scattering and multipath fading. It's also a flexible scheme allowing you to easily create signals of arbitrary bandwidth by adding or removing some carriers. Lastly, OFDM fits well with MIMO and massive MIMO systems because the presence of multiple antennas allow for better exploitation of scattering environments and more efficient use of OFDM data streams. MATLAB and its wireless communications products such as 5G, LTE, and wireless LAN toolbox provide functions tools and apps to work directly with OFDM signals.
You can generate standard compliant OFDM wave forms and perform end-to-end simulations of 5G, LTE, and W LAN systems. You can analyze the received OFDM signals with metrics such as EVM, ACLR, bit error rate, block error rate, and throughput which will help you verify the compliance of your wireless
标准规格的系统。您还可以使用无线波形生成应用将OFDM信号直接连接到RF仪器进行直播测试。
您可以使用无线通信工具箱的内置功能来实现DM接收器操作,例如同步,通道估计,均衡和解调。您可以使用MATLAB工具在每个步骤中可视化数据。您可以使用无线HDL工具箱和HDL编码器将DM算法实现到FPGA和ASIC上。然后,使用HDL验证仪,您可以验证您的低级实现与黄金参考设计匹配。有关更多信息,请探索无线通信解决方案页面以及OFDM文档。万博 尤文图斯
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