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AWR2944EVM: AWR2944EVM and Real Baseband Architecture

Serhat Arslan
Prodigy 220 points
Part Number: AWR2944EVM
Other Parts Discussed in Thread: AWR2944, AWR2243, AWR1843AOP, AWR6843AOP

Tool/software:

Hello Officer,

I am trying to understand the differences between "Real Baseband Radar Systems" and "Complex Baseband Radar Systems."

I watched TI's video, which provides information about these topics. I have included screenshots from the video below.

The AWR2944 uses the Real Baseband System according to AWR294x Technical Reference Manual (Rev. D). 

I wonder why the AWR2944 uses a real baseband architecture. I would be grateful if you could enlighten me on this subject.

Best Regards,

Mehmet Serhat Arslan

  • 0
    TI__Intellectual 2621 points

    Hi Mehmet, 

    AWR2944 has a unique design that keeps the noise figure about the same as AWR2243. If you look at the datasheets, you'll notice they have similar noise figure values. The plus point with the AWR2944 is the lower power consumption. If you compare the datasheet, you will see the peak power that is lower on the analog rails 1V and 1.8V even after adding the 4th transmitter. 

    To understand the difference between real and complex data in detail please refer to the following app note: Complex base band arch. For FMCW radar systems (Auto) - IQ​ (ti.com)

    Regards,

    Aydin

  • 0
    Prodigy 220 points

    Hi Aydin, 

    Thank you for your prompt response. I researched and found the following information regarding this topic:

    • AWR1843AOP: Uses complex baseband architecture
    • AWR6843AOP: Uses complex baseband architecture
    • AWR2944: Uses real baseband (I-only) architecture

    I am curious about the criteria for selecting between complex baseband and real baseband architectures for these radars.

    I am trying to justify this selection technically. Could you please provide more details on this?

    Best Regards. 

  • +1 in reply to Serhat Arslan
    TI__Intellectual 2621 points

    Hi Serhat,

    The decision to use a real baseband architecture in the AWR2944 is primarily driven by design/balancing power efficiency and design simplicity while maintaining the required performance for the target applications. In addition to the power efficiency that I mentioned above, the processing is also simplified by using I only data. I only system avoids the overhead of handling quadrature signals making it more efficient in terms of hardware and processing needs. Real baseband works well in scenarios where high flexibility from a complex baseband isn't necessary, helping to reduce system cost and complexity without compromising noise figure. At the same time, the complex baseband architecture would result in 3dB SNR improvement due to rejection of folded image-band noise, so there is some trade-off between the two systems. In the radar devices that support complex baseband architecture, we do provide the flexibility through APIs to choose between real/complex/complex2X mode depending on customers application. 

    For a deeper understanding of the technical differences between the two architectures, the app note I shared earlier provides helpful insights. Let me know if you'd like me to highlight specific point from it. 

    Regards,

    Aydin