<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[chenxr的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/QDchenxr</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; QDchenxr]]></copyright><item><title><![CDATA[OFDMA与CDMA的相似之处]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/140225621</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/140225621</guid><author>QDchenxr</author><pubDate>Sat, 06 Jul 2024 10:52:30 +0800</pubDate><description><![CDATA[介绍OFDMA和CDMA的相似之处，OFDMA中的复指数序列类似CDMA的扩频码。]]></description><category></category></item><item><title><![CDATA[OFDM中采样频率与带宽的关系]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/140213704</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/140213704</guid><author>QDchenxr</author><pubDate>Sat, 06 Jul 2024 10:49:51 +0800</pubDate><description><![CDATA[简单分析OFDM的子载波数量、带宽和采样频率之间的关系。]]></description><category></category></item><item><title><![CDATA[基于码分多址的多用户水下无线光通信（3）——解相关多用户检测]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/139214458</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/139214458</guid><author>QDchenxr</author><pubDate>Sun, 23 Jun 2024 22:10:12 +0800</pubDate><description><![CDATA[本文介绍基于解相关的多用户检测算法。解相关检测器的优点是因不需要估计各个用户的接收信号幅值而具有抗远近效应的能力。常规的解相关检测器有运算量大和实时性差的缺点，本文针对异步CDMA的MAI主要来自干扰用户的相邻三个比特周期的特点，给出了基于相邻三个匹配滤波器输出数据的截断解相关检测算法。]]></description><category></category></item><item><title><![CDATA[基于码分多址的多用户水下无线光通信（2）——系统模型和基于子空间的延时估计]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/139214444</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/139214444</guid><author>QDchenxr</author><pubDate>Sun, 23 Jun 2024 22:08:23 +0800</pubDate><description><![CDATA[本文首先介绍了基于CDMA的多用户UOWC系统模型，并给出了多用户收发信号的数学模型。然后介绍基于子空间的延时估计算法，该算法只需要已知所有用户的扩频码，然后根据扩频波形的循环移位在观测空间的信号子空间上的投影进行延时估计。]]></description><category></category></item><item><title><![CDATA[基于码分多址的多用户水下无线光通信（1）——背景介绍]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/139297140</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/139297140</guid><author>QDchenxr</author><pubDate>Sun, 23 Jun 2024 22:06:32 +0800</pubDate><description><![CDATA[研究生期间做多用户水下无线光通信（Underwater Optical Wireless Communication，UOWC），写几篇博客分享一下学的内容。本文介绍研究背景和研究现状。]]></description><category></category></item><item><title><![CDATA[ZYNQ通过AXI DMA实现PL发送连续大量数据到PS DDR]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/134325391</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/134325391</guid><author>QDchenxr</author><pubDate>Fri, 10 Nov 2023 11:04:17 +0800</pubDate><description><![CDATA[PL 和 PS 的通信方式有 AXI GPIO、BRAM、DDR等。对于数据量较少、地址不连续、长度规则的情况，BRAM 比较适用。而对于传输速度要求高、数据量大、地址连续的情况，比如 ADC，可以通过 AXI DMA 来完成。本文介绍如何在 ZYNQ 上使用 AXI DMA 实现从 PL 发送大量连续数据到 PS 的 DDR 存储器，适用于搬运 ADC 连续采样数据。]]></description><category></category></item><item><title><![CDATA[HLS实现CORDIC算法计算正余弦并上板验证]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/132514284</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/132514284</guid><author>QDchenxr</author><pubDate>Sat, 26 Aug 2023 18:36:29 +0800</pubDate><description><![CDATA[本文介绍CORDIC算法计算正余弦的HLS代码，并上板验证的代码的可行性。]]></description><category></category></item><item><title><![CDATA[HLS实现FIR低通滤波器并上板验证]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/132263210</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/132263210</guid><author>QDchenxr</author><pubDate>Sun, 13 Aug 2023 22:21:34 +0800</pubDate><description><![CDATA[本文介绍用HLS编写FIR滤波器代码并做相应优化，HLS代码编写好后导入System Generator进行仿真，最后上板验证代码的可行性。]]></description><category></category></item><item><title><![CDATA[ZYNQ无SD卡配置Linux系统到QSPI Flash和eMMC]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/130800908</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/130800908</guid><author>QDchenxr</author><pubDate>Mon, 22 May 2023 12:04:47 +0800</pubDate><description><![CDATA[本文介绍在ZYNQ上，没有SD卡时，如何用QSPI Flash和eMMC启动Linux系统。QSPI Flash放置BOOT.BIN，eMMC的第一个分区（FAT32格式）放置image.ub和system.dtb，eMMC第二个分区（EXT4格式）放置根文件系统放。eMMC的操作和SD卡一样，难点是如何格式化eMMC，其他步骤和用SD卡时差不多。]]></description><category></category></item><item><title><![CDATA[Gauss-Seidel迭代法求解线性方程组]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/130670519</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/130670519</guid><author>QDchenxr</author><pubDate>Sun, 14 May 2023 17:00:59 +0800</pubDate><description><![CDATA[介绍Gasuu-Seidel迭代法求解线性方程组的公式，给出实现Gasuu-Seidel迭代法的C语言代码。]]></description><category></category></item><item><title><![CDATA[Jacobi迭代法求解线性方程组]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/130669361</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/130669361</guid><author>QDchenxr</author><pubDate>Sun, 14 May 2023 16:31:11 +0800</pubDate><description><![CDATA[介绍Jacobi迭代法求解线性方程组的公式，给出实现Jacobi迭代法的C语言代码。]]></description><category></category></item><item><title><![CDATA[ZYNQ移植uCOSIII]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/125307865</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/125307865</guid><author>QDchenxr</author><pubDate>Fri, 01 Jul 2022 00:55:43 +0800</pubDate><description><![CDATA[本文介绍在ZYNQ开发板上移植uCOSIII操作系统，配置BSP，这里记录部分关键步骤，实现串口打印字符串。]]></description><category></category></item><item><title><![CDATA[MATLAB生成M序列和Gold序列]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/125306359</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/125306359</guid><author>QDchenxr</author><pubDate>Thu, 16 Jun 2022 00:19:49 +0800</pubDate><description><![CDATA[本文简要介绍了M序列和Gold序列的特点和MATLAB生成方法，并给出MATLAB代码。]]></description><category></category></item><item><title><![CDATA[三层BP神经网络公式推导及C语言实现]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/124543772</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/124543772</guid><author>QDchenxr</author><pubDate>Mon, 02 May 2022 18:42:35 +0800</pubDate><description><![CDATA[本文推导了三层BP神经网络的训练公式，并给出C语言代码。]]></description><category></category></item><item><title><![CDATA[基于插值算法和Gardner定时误差检测的OOK信号定时同步的FPGA实现]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/124519007</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/124519007</guid><author>QDchenxr</author><pubDate>Sat, 30 Apr 2022 21:33:54 +0800</pubDate><description><![CDATA[本文介绍如何用FPGA实现基于插值算法的OOK信号定时同步。定时同步的主要模块包括插值滤波器、定时误差检测器、环路滤波器和数控振荡器。我们的目标是用外部提供50MHz时钟的zynq7100芯片实现400MHz采样频率和100Mbps的OOK数字基带信号的定时同步。...]]></description><category></category></item><item><title><![CDATA[Vivado的DDS IP核实现连续相位2FSK]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/122787252</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/122787252</guid><author>QDchenxr</author><pubDate>Sat, 05 Feb 2022 01:31:25 +0800</pubDate><description><![CDATA[本文介绍如何使用DDS IP核实现连续相位二进制频移键控。输入比特速率1MHz，1 bit对应的载波为4MHz正弦信号，0 bit对应的载波为6MHz正弦信号，系统时钟频率50MHz。]]></description><category></category></item><item><title><![CDATA[Vivado的FIR IP核实现低通滤波器]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/122659624</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/122659624</guid><author>QDchenxr</author><pubDate>Mon, 24 Jan 2022 22:47:33 +0800</pubDate><description><![CDATA[  本文介绍如何使用Vivado的FIR IP核实现低通滤波器。我们将设计一个采样频率为10MHz，通带0~1MHz，阻带高于2MHz的FIR低通滤波器。测试时，滤波器的输入信号为1MHz和3MHz的正弦波的叠加信号，期望滤波器能输出失真较小的1MHz的正弦信号。]]></description><category></category></item><item><title><![CDATA[Vivado将.v文件作为模块加入Block Design]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/120277813</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/120277813</guid><author>QDchenxr</author><pubDate>Mon, 13 Sep 2021 23:51:18 +0800</pubDate><description><![CDATA[本文介绍在Vivado中，如何在不封装IP core的情况下将HDL写的模块放入Block Design。]]></description><category></category></item><item><title><![CDATA[GD32F103配置SPI+DMA收发数据]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/119813261</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/119813261</guid><author>QDchenxr</author><pubDate>Thu, 19 Aug 2021 23:54:47 +0800</pubDate><description><![CDATA[本文介绍如何配置GD32F103系列的SPI和DMA，并贴出相关代码。]]></description><category></category></item><item><title><![CDATA[基于Qt的.bmp图片转C语言数组或.bin二进制文件方法]]></title><link>https://blog.youkuaiyun.com/QDchenxr/article/details/119812364</link><guid>https://blog.youkuaiyun.com/QDchenxr/article/details/119812364</guid><author>QDchenxr</author><pubDate>Thu, 19 Aug 2021 23:13:45 +0800</pubDate><description><![CDATA[用Qt设计了可以将bmp格式的图片转换为C语言的数组和二进制文件的小工具，并贴出了部分转换代码。]]></description><category></category></item></channel></rss>