[TheWaveCarver]

I have a WRT3200ACM router flashed with DD-WRT Build v3.0-r55630. I'm looking for the MIMO Transmission - Fixed Rate setting. For my application, it is important that I be able to lock the MIMO rate. Does anyone know where this setting might be found or if it does not exist?

I've tried the following CLI commands:
Command: iwconfig wlan0 rate 54M
Result: Error for wireless request "Set Bit Rate" (8B20) :
SET failed on device wlan0 ; Invalid argument.

Command: iw wlan0 set bitrates legacy-5 9
Result: command failed: Invalid argument (-22)

Command: iw wlan0 set bitrates ht-mcs-5 1
Result: command failed: Not supported (-95)

I'm hoping someone here might know a workaround to the lock the rates. Ideally, I'd like to be able to select an exact MCS rate but I might be able to make adjusting Mbps work. However, it seems that neither of these are possible and that the rate is stuck in "Auto". I'm looking for this capability as part of a research project.

Side question: Is it valid to enable RX chains 1,2,3,4 but only TX chains 2,3? This effectively would be a 4:2 MIMO configuration. I'd appreciate any thoughts, thank you.