Changes between Version 80 and Version 81 of Other/Summer/2024/signal

Timestamp:

Aug 6, 2024, 10:47:34 PM (4 months ago)

Author:

wesleychen

Comment:

—

Other/Summer/2024/signal

@@ -128 +128 @@
 After finding the frequency offset and phase, we can multiply each IQ sample by some exponential e^(-''i''*<delta>)^ where <delta> stands in for the error / angle offset of that sample. When multiplying numbers in the complex plane, the angle of the two are added allowing us to easily correct every sample. Now we see why complex numbers are useful. The corrected IQ samples are shown above right.
 
-== Architecture
+== Results
 
-{{{#!html
-<img src="https://i.postimg.cc/9XrksKg0/temp-Image-KQMp-H4.avif" style="height: 200px;"></img>
-}}}
+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"
 
-== Conclusions
+[[Image()]]
 
-https://postimages.org
+The 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.
+
+[[Image()]]
+
+Below is also the architecture for the entire transmission and reception process.
+
+[[Image()]]
+
+Now when we try to read the signals. We can still read the BPSK, but get garbage from the OFDM.
+
+[[Image()]]
+
+Here is also the error rates when OFDM and BPSK are at different levels.
+
+[[Image()]]
+
+We sent OFDM in 4 consecutive groups. Because the synchronization is interfered with, the first group is read ok, but the subsequent ones fail.
+
+== Final Regards
+