Other Parts Discussed in Thread: TIDEP-01000, , DCA1000EVM, MMWAVE-SDK, AWR1843
Hi,
Happy new year, i am studying IWR6843 solution for surveillance application, i've researched some information from e2e, but still have some questions below.
1. In TIDEP-01000 reference design user guide page 6, the TX power = 12dBm, RX noise figure = 12dB
In IWR6843 datasheet, the TX power = 10dBm(typ.), RX noise figure = 14dB(typ.)
Why there is difference in 2 docs. ? is there a diagram or profile to show the variation of TX and RX noise figure from 60~64GHz ?
2. Based on IWR6843ISK antenna design, the RX distance is 2/lamda, the TX1 to TX3 distance is 2 lamda, TX2 to TX1/TX3 distance is 1 lamda and up 2/lamda, i can understand this kind of antenna distance design
for TDM-MIMO mode, however i am confused it is also can be used for BPM-MIMO mode.
The benfit of BPM is able to get higher transmission gain and SNR while 2TXs transmit simultaneously, but if TX antenna distance is too far (usually > 2/lamda), there is no beamforming effect when 2TXs transmit
simultaneously, therefore the total TX antenna gain will not be increased.
My questions are
a. The TX1 to TX3 distance is 2 lamda, does it still have good beamforming effect to get higher gain and implement BPM ?
b. TX2 funstion is for elevation detection, but it has more 2/lamda height than TX1/TX3, can TX1/TX2 or TX2/TX3 implement BPM ? Is there no beamforming effect concern for different height antenna and 1 lamda
distance ?
c. If we want to get below virtual antenna matrix by using BPM, does the distance of TX1 and TX3 also need to be 4d and same as using in TDM mode ? what is the antenna distance difference between BPM and TDM mode ?
3. I referred the ticket https://e2e.ti.com/support/sensors/f/1023/t/678806?tisearch=e2e-sitesearch&keymatch=BPM, pls. help to explain more why the conclusion is BPM is not necessary even only 2TX transmit
simultaneously ?
4. Does TI have 6843 or 1443 reference design which is using BPM ?
thanks.