Changes between Version 82 and Version 83 of Other/Summer/2024/signal


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Timestamp:
Aug 6, 2024, 10:50:20 PM (4 months ago)
Author:
wesleychen
Comment:

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  • Other/Summer/2024/signal

    v82 v83  
    132132Earlier we saw BPSK working and get our message "hiii" back. We can do the same for OFDM. Here we receive our message "hi winlab"
    133133
    134 [[Image(Screen Shot 2024-08-06 at 6.38.04 PM.png)]]
     134[[Image(Screen Shot 2024-08-06 at 6.38.04 PM.png, 200px)]]
    135135
    136136The 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.
    137137
    138 [[Image(Screen Shot 2024-08-06 at 6.38.11 PM.png)]]
     138[[Image(Screen Shot 2024-08-06 at 6.38.11 PM.png, 200px)]]
    139139
    140140Below is also the architecture for the entire transmission and reception process.
    141141
    142 [[Image(Screen Shot 2024-08-06 at 6.38.20 PM.png)]]
     142[[Image(Screen Shot 2024-08-06 at 6.38.20 PM.png, 200px)]]
    143143
    144144Now when we try to read the signals. We can still read the BPSK, but get garbage from the OFDM.
    145145
    146 [[Image(Screen Shot 2024-08-06 at 6.38.29 PM.png)]]
     146[[Image(Screen Shot 2024-08-06 at 6.38.29 PM.png, 200px)]]
    147147
    148148Here is also the error rates when OFDM and BPSK are at different levels.
    149149
    150 [[Image(Screen Shot 2024-08-06 at 6.38.38 PM.png)]]
     150[[Image(Screen Shot 2024-08-06 at 6.38.38 PM.png, 200px)]]
    151151
    152152We sent OFDM in 4 consecutive groups. Because the synchronization is interfered with, the first group is read ok, but the subsequent ones fail.