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