caichao / livestreamcsi Goto Github PK

Hello,Mr Cai.l am here to ask some questions about the live stream CSI on the Github that you have implemented. l would appreciate it a lot if you could help me.

1.In "realtime_plot.m", why we set the buffer length as 393+2(line 27)?Why we abandon the first byte(line 56)?And why we treat 392 bytes as the length of a valid packet(line 58)?l am a little confused about it because l think each packet is 213 bytes.In the program log_to_file, it can print the size of each packet received.And the result is 213 bytes each packet. l hope that you could explain it.Thank you.

2.Later, l modified the file realtime_plot.m.Set buffer length as 213+2 and valid packet size as 212 bytes, and it can work well. But there is another problem. When I compare the live stream csi with the csi parsed by read_bf_file.m from the file, the result is different. So, l can not figure out whether there is something wrong with the realtime_plot.m or read_bf_file.m. l really hope that you could give me a hand.Thank you.
l am looking forward to your reply.

In the process of run the realtime_plot, the error "Wrong beamforming matrix size" occasionally happen. I guess maybe the transmitting rate is too high, but I couldn't use ping to modify the rate. Because tcpip is directly built after run my real-time data processing program and sudo ./log even haven't used ping. Do you have any idea, Mr Cai? @caichao

I can't find any definition of 'break_condition', and an error happened when run the code in MATLAB.
Can you help me?
while 1 < break_condition while(1) nBytes = get(TCPServer,'BytesAvailable'); if nBytes >= bufferLen % disp('read bytes ');disp(nBytes); break; end end i = i + 1;

Hello Mr Cai,
I’m studying real-time display of csi, and your code has given me much help,thank you! But I'm still experiencing some problems. I would appreciate it if you could help me. The details are as follows.
Because my matlab version is 2010b on ubuntu 11.04(ubuntu 11.04 is able to support the 802.11 tool after Tsinghua University‘s students made some changes), the program “realtime_plot.m” could only run after I make some changes for it. After I ran the program on matlab and ran "sudo ./log save.dat” on terminal, the terminal indicated connect ok and the file named save.dat could log csi, but the TCP server couldn’t receive any data(ValuesReceived and BytesAvailable is always 0). And whenever I stop the program by using Ctrl+C, matlab shows the stop position is in the line of “nBytes = get(TCPServer,'BytesAvailable');”
I have tried to solve it but I failed. Could you give me some suggest ? Thanks!
@caichao