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Our CDMA simulation behaves as expected according to theory. While testing our simulation, we observed that bit error rate increases with more users in the system and decreases with a greater processing gain. We found that SNR had a significant effect on the bit error rate when there were few users in the system. With many users, the bit error rate was high regardless of SNR because the waveforms of the other users appear as noise in the channel.
We learned a lot while creating and testing our simulator. Through trial and error, we learned the importance of orthogonality in spreading sequences. The orthogonal property of long spreading sequences is only approximate, so increasing users reduces orthogonality and leads to more error. Orthogonality is important because it allows a particular receiver to disregard all waveforms except the particular one it wishes to decode, so reducing orthogonality means parts of other undesired waveforms are being read by the receiver.
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