Rabbit Nick's Blog

摘要： I find a paper about GNURADIO CORE and think it is a good reference. I will use Chinese to introduce it.我会用中文主要介绍一下这个GNURADIO CORE WORK主要讲什么东西。Contents1 How the GNU Radio scheduler iscalled and what it does 12 How a thread of each block works 5内容1. GNU Radio 调度器怎样调用 和怎么工作2.每个模块的线程怎么工作1 How ... 阅读全文

摘要： 改变Ubuntu桌面所在文件夹不知道我的T61发生什么事情，桌面上的文件夹全部出现在桌面，上网查到这段话，修改了桌面文件夹： 刚安装上Ubuntu11.04的时候，也不懂得怎么修改firefox下载文件保存的位置，默认是在桌面。但下载下来要在终端上使用文件就必须进入桌面。但桌面所在文件夹是“桌面”，在终端打中文比较麻烦，就异想天开的把此文件夹重命名为“Desktop”,结果注销之后桌面文件夹就被默认为用户文件夹了，用户目录下的所有文件及文件夹都跑到桌面了，很郁闷。后来google了一下，发现桌面可以任意设置，修改/home/你的用户文件夹/.config/user-dirs.dirs里面的XD 阅读全文

摘要： 2011-10-24modify ~/gnuradio3.4.1/usrp/host/lib/usrp_basic.ccabout line 111,usrp_basic::usrp_basic (int which_board,libusb_device_handle*open_interface(libusb_device *dev),conststd::string fpga_filename,conststd::string firmware_filename) : d_udh (0), d_ctx (0),d_usb_data_rate (16000000),// SWAG, see 阅读全文

摘要： Yesterday, I read a paper about Complex in digital communication system. I thought that was a good paper to comprehend the complex meaning in engineering. So I copied some points from this paper and made it briefer.Introduction :Quadrature signals are based on the notion of complex numbers and perha 阅读全文

摘要： Today, I use another computer to compile gnuradio-3.3.0 and find the error. >_ class boost::weak_ptr’usrp2.cc:41:33: error: expected a type, got ‘usrp2::usrp2::usrp2’usrp2.cc:43:75: error: type/value mismatch at argument 1 in templateparameter list for ‘template class 阅读全文

摘要： Apple has lost a visionary andcreative genius, and the world has lost an amazing human being.Those of us who have been fortunate enough to konw and work withSteve have lost a dear friend and an inspiring mentor. Steve leavesbehaind a company that only he could have built, and his spiritwill forever 阅读全文

摘要： The naive digital communications layer: The first layer of the onion introduces the digital transmission of data, and discusses how bits of information may be coded into waveforms, sent across space to the receiver, and then decoded back into bits. Since there is no universal clock, issues of timing 阅读全文

摘要： 2011-10-02Introduce:There are two RX chennels in USRP1. It can be implementeddouble receivers by us.Abstract:Yesterday, I rewrote usrp_rx_cfile.cc to implement doublereceivers. Now, I sum up how to write a multiple antenna receivercode. I use this code to receive GSM donwlink. We can use double RXto 阅读全文

摘要： 发现一直有人提这个区别，我自己也没想过有什么异常的地方，于是找到了linux下的源码看看void * __cdecl memcpy ( void * dst,const void * src,size_t count) {void* ret = dst;while(count--) {*(char*)dst = *(char *)src;dst= (char *)dst + 1;src= (char *)src + 1;}return(ret);}void * __cdecl memmove （ void * dst,const void * src,size_tcount){void* re 阅读全文

摘要： 如果一个虚函数不是纯虚函数，父类需要实现它。否则就会报错：undefined reference to vtable XXX例如：class a{public:virtual bool fun();}class b:public a{virtual bool fun(){cout << "I amb"<<endl;}}以上代码编译时会报错undefined reference to vtable XXX修改为：class a{public:virtual bool fun(){cout << "IamA"<< 阅读全文