Changes between Version 84 and Version 85 of Other/Summer/2024/signal


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Timestamp:
Aug 6, 2024, 10:51:42 PM (7 weeks ago)
Author:
wesleychen
Comment:

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  • Other/Summer/2024/signal

    v84 v85  
    130130== Results
    131131
    132 Earlier we saw BPSK working and get our message "hiii" back. We can do the same for OFDM. Here we receive our message "hi winlab"[[Image(Screen Shot 2024-08-06 at 6.38.04 PM.png, 200px)]]
     132Earlier we saw BPSK working and get our message "hiii" back. We can do the same for OFDM. Here we receive our message "hi winlab"
     133
     134[[Image(Screen Shot 2024-08-06 at 6.38.04 PM.png, 400px)]]
    133135
    134136The ultimate goal is to send the two signals and see how they interact. This can very easily done by first blocking out the carriers we don't want to use in OFDM, then combining the signals simply by adding them.
    135137
    136 [[Image(Screen Shot 2024-08-06 at 6.38.11 PM.png, 200px)]]
     138[[Image(Screen Shot 2024-08-06 at 6.38.11 PM.png, 300px)]]
    137139
    138140Below is also the architecture for the entire transmission and reception process.
    139141
    140 [[Image(Screen Shot 2024-08-06 at 6.38.20 PM.png, 200px)]]
     142[[Image(Screen Shot 2024-08-06 at 6.38.20 PM.png, 400px)]]
    141143
    142144Now when we try to read the signals. We can still read the BPSK, but get garbage from the OFDM.
    143145
    144 [[Image(Screen Shot 2024-08-06 at 6.38.29 PM.png, 200px)]]
     146[[Image(Screen Shot 2024-08-06 at 6.38.29 PM.png, 400px)]]
    145147
    146148Here is also the error rates when OFDM and BPSK are at different levels.
    147149
    148 [[Image(Screen Shot 2024-08-06 at 6.38.38 PM.png, 200px)]]
     150[[Image(Screen Shot 2024-08-06 at 6.38.38 PM.png, 300px)]]
    149151
    150152We sent OFDM in 4 consecutive groups. Because the synchronization is interfered with, the first group is read ok, but the subsequent ones fail.