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AWR2243: I want to know the operating principle of the transmitter subsystem of this model

jiaxuan liu
Prodigy 85 points
Part Number: AWR2243

Hello, staff, I saw the design sketch of the transmitter terminal system in the AWR2243 data manual, but it does not have a specific logo like the receiver.  Can you briefly describe the principle of the transmitter terminal system to me?  thanks.
Or according to the schematic diagram of the transmission principle, just use a few amplifiers at the transmitting end?
In addition, I would like to ask, is it a simple LFM real signal? Why can such a real number signal be received as two IQ signals? thanks

  • 0
    Prodigy 85 points

    Hello staff, I have watched the training video and it is very rewarding, but it still hasn't solved my problem.
    In the principle part, I did understand the principle, but this did not let me understand the form of the signal.
    In the interpretation part of the device, only these parts of the transmitter are introduced: "Next we discuss the components of the radio frequency and analog subsystems, namely the transmitter subsystem. Depending on the device, the transmitter subsystem contains two or three parallel emission chains. Each transmission chain has independent phase and amplitude control. Up to two transmission chains can be operated at the same time. But all three chains can be operated together through time multiplexing. The device also supports binary phase modulation and interference for MIMO radar Inhibition. "This does not allow me to fully understand the format of the transmitted signal.
    What I want to know is that this transmitted signal is a real signal. Is IQ modulation performed before transmission, and then IQ demodulation is performed on the receiving end?
    Or is the transmitted signal just a real signal of cos(2pi*fc*t+pi*k*t^2+φ) and then subjected to IQ demodulation?
    Therefore, the structure diagram of the signal transmitter and the tutorials in the training video do not give me a good answer. Can you help me?

  • +1 in reply to jiaxuan liu
    TI__Expert 8275 points

    Hi Jiaxuan,

                     If I understand your question you want to know the type of signal transmitted by the transmitter, right? So all of TI's FMCW radars support transmission of real and complex signals. The pdf in this link would enlighten you more regarding the transmitted signal and what are the advantages of using complex signal over real signal: https://www.ti.com/lit/wp/spyy007/spyy007.pdf . If you look at Fig. 2 in this pdf, you can find how real signal is transmitted using the TX antenna and how the IF signal is obtained by mixing the Rx signal with Tx signal. Similarly, if you look at Fig. 5 you would get to know how complex baseband architecture works on the process of transmitting complex signal. And finally table-1 shows the comparison of how the complex baseband option is different from the real only option.

                    Request you to please go through the attached pdf and let me know if you have further questions.

    Thanks and Regards,

    Akshay. 

  • 0 in reply to Akshay Kumar Chandrasekaran
    Prodigy 85 points

    Dear staff, 

                   Thank you very much for your help, this did solve my problem.

  • 0 in reply to Akshay Kumar Chandrasekaran
    Prodigy 85 points

    And I still have a small question. In transmit subsystem, It seems that there are only six amplifiers in the structure diagram. So does this mean that the RF signal is divided into two channels and amplified, and each channel is divided into two channels and amplified again, and finally the four channels of signals are added to get the transmitted signal? Thanks for your reply.

  • 0 in reply to Jitendra Gupta
    Prodigy 85 points

    Dear friend,

    I have understood the working principle of RX by your help. But my question is about TX module. I'm sorry that there is no answer about my question in these pdf. So can i ask it again about transmit subsystem?  Does this mean that the RF signal is divided into two channels and amplified, and each channel is divided into two channels and amplified again, and the four channels of signals are added to the finall transmitted signal? Thanks for your patience.