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Original question:

IWR1843BOOST: About FOV and MIMO of IWR1843 BOOST

IWR1843BOOST: Simultaneous implementation of beamforming (angle) and MIMO

toshinari matsuura
Prodigy 50 points
Part Number: IWR1843BOOST
Other Parts Discussed in Thread: IWR1843, IWR6843

Hi team,

Does the evaluation board (IWR1843BOOST) perform beamforming to increase the transmission angle? Which demo software does it?

If I do beamforming to angle the transmit signal, will I not be able to do 2x4 MIMO because each of the two transmit antennas will be in phase with each other to form a single beam?
Is it possible to angle the beam with two antennas and do 2x4 MIMO at the same time?

Best regards,

Toshi

  • 0
    TI__Genius 10584 points

    Hi Toshi, 

    We currently offer beamforming as part of our Long Range People Detection lab, which includes a guide on how to enable TX beamforming on the device.  However, this demo software is only compatible with IWR6843, if you want to use it on the IWR1843 you would have to port the demo yourself.  Is there reason you are using the IWR1843 device for your application?  This device operates in the 76-81GHz band, which is more geared towards automotive applications.  We suggest the IWR6843 family of devices for industrial applications, which operate in the 60-64GHz band.

    Regards,

    Brennan

  • 0 in reply to Brennan Hartigan
    Prodigy 50 points

    Hi Brennan,

    Is it possible to do 2x4 MIMO with signal processing, even if two antennas are used to angle the beam so that the two signals are in different phases?

    Will the transmit signal be considered as one signal and become 1x4? Please let me know your opinion.

    Best regards,

    Toshi

  • 0 in reply to toshinari matsuura
    TI__Mastermind 39915 points

    HI, Toshi:

    If two TX are used for TX beamforming, then at the receiver, it will be considered as one signal and 4 RX.  Therefore, we usually consider TX beamforming if we need to increase the max detectable range.  There is no angle resolution improvement by using TX beamforming.

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Prodigy 50 points

    HI Zigang

    If we use two Tx antennas for beamforming with phase difference, the angular range of the transmission is increased, but the angular resolution is coarser because we cannot do MIMO with 2(Tx)x4(Rx) = 8 receive antennas.

    So the signal processing process cannot be computed with the understanding that it is 2x4?

    Best regards,

    Toshi

  • 0 in reply to toshinari matsuura
    TI__Mastermind 39915 points

    HI, Toshi:

    IF by angular range, you mean field of view, then TX beamforming can not increase the field of view.  

    I do not understand what do you mean by "the signal processing can not compute with the understanding that is 2x4".  Please provide more detail.   

    If you transmit TX1 + TX2, and then TX1 - TX2 as two chirps and post processing will be able to separate TX1 and TX2 at the receiver.  But then it is called BPM, not called TX beam steering. 

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Prodigy 50 points

    HI Zigang

    Can I do TX beam steering and BPM-MIMO at the same time?
    Because even if I do beam steering, I know the phase difference between the two Tx beams, so I think that the signal processing at the receiver side can calculate the MIMO.

    Best regards,

    Toshi

  • +1 in reply to toshinari matsuura
    TI__Mastermind 39915 points

    Hi, Toshi:

    At device level, you can program different phase on different TX and you can send multiple chirps with different phase combination.  It is up to you to develop signal processing algorithm to achieve your goal.   

    Best,

    Zigang