I want to design a communication system to transmit modulated text file,audio and video signals ad receive it properly.How to implement it in matlab?
may be refer to the following site help you
https://www.mathworks.com/help/comm/ug/digital-modulation.html
regards
Dear Neema Raj,
theoretically, using the Session Initiation Protocol (SIP), it is possible to set up a multimedia connection in an IP network to transmit text files as well as audio and video using various digital modulation techniques. Of great importance here is the description of sessions with SDP (Session Description Protocol) for grouping of media streams.
My chapter "SIP Guide" (in German) may help you - see:
https://www.researchgate.net/publication/288493389_SIP_Guide_-_Session_Initiation_Protocol_Guide
There the following figures are important to you:
- Fig. 7382 (SIP topics and their RFCs; see: “Description of Sessions” and “Multimedia Multiparty Communication”)
- Fig. 7385 (SIP message with multipart body: a) Formation of the multipart body, b) Structure of a SIP message with two body parts)
- Fig. 7382 (SIP topics and their RFCs)
- Fig. 7388(Further development of the description of sessions with SIP. see: Grouping of Media Streams !!!!! - RFCs)
Much success and best regards
Anatol Badach
Dear Neema,
welcome,
In principle you can use three different channels with different carrier frequencies to transmit the three streams the video stream, the audio stream and the data stream. You can divide the overall bandwidth into three subbands, one fro each signal. The first step is to determine the bit rate demand for each signal. If you define the modulation technique say 4 QAM, then you can calculate the bandwidth for each signal and consequently you can choose the center frequency as carrier frequency . Then you need to have three modulators and then you combine the output of the three modulators. In the demodulator you perform the inverse process.
There are many other solutions using different modulation techniques like the OFDM. In this case you can time domain multiplex the three signals and send them as one stream.
Best wishes
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