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how to implement a multi user communication system?

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i have implemented a single user WCDMA communication link with a transmitter, AWGN channel and a receiver using Qpsk modulation technique and spreaded using a PN sequence. I need to make this a multi user communication link.
By that is it possible to do that using a MUX and a DEMUX before and after the AWGN channel?? What specific parameters i have to change??
Please Help..

Answers (1)

Anshuman
Anshuman on 22 Jul 2024
You can extend your single-user WCDMA communication link to a multi-user communication link by using a MUX (multiplexer) and DEMUX (demultiplexer) before and after the AWGN channel. Here are the key steps and parameters to change:
Steps to Implement Multi-User WCDMA Communication Link
  1. Define Multiple Users: Each user will have their own data stream, PN sequence, and QPSK modulator.
  2. Multiplex the Users: Use a MUX to combine the multiple user data streams into a single stream before the AWGN channel.
  3. Add AWGN Channel: The combined signal will pass through the AWGN channel.
  4. Demultiplex the Users: Use a DEMUX to separate the combined signal back into individual user signals after the AWGN channel.
  5. Process Each User Signal: Each user signal will be processed individually through their respective QPSK demodulator and PN sequence despreader.
Key Parameters to Change
  1. Number of Users: Define the number of users in your system.
  2. PN Sequences: Each user should have a unique PN sequence to ensure orthogonality and minimize interference.
  3. Data Streams: Generate separate data streams for each user.
  4. Multiplexer and Demultiplexer: Use a MUX to combine the user data streams before transmission and a DEMUX to separate them after reception.
Hope it helps!

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