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hi,
After we download the Lab 6 to our current WARP board, the yellow light of the RF board is on but the green one of the RF board is not on. Can our WARP board support the Lab 6 which is done in the latest RICE workshop.
Thanks a lot
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A small batch of radio boards was built with some LEDs mounted backwards. I believe one of your radios came from this batch. Everything else on the board works properly. Your new MIMO kits will have radios from a newer batch which don't have this problem.
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Hey murphpo,
Well, the red lights on one of the RF boards cannot be turned on due to the problem of mounting. You've indicated this problem to us long time ago.
The problem is the yellow and the green lights on the RF board. What does each of them indicate? Why the green light is off after we download lab 6?
For both RF boards, when we download a working project, both the yellow and green lights are on and we can see the spectrum of transitted signals on a spectrum analyzer. When we downloaded lab 6 into both boards, however, only the yellow light is on and the green one is off. Also, we cannot see any signal on spectrum analyzer. Both RF board have the same issue. By the way, most other initialization produces of lab 6 are performed successfully by looking at the RS232 output and the seven segment display on board.
In another post, http://warp.rice.edu/forums/viewtopic.php?id=52, you mentioned about single antenna configuration and MIMO configuration. So lab 6 is mimo configuration? What's the difference? As I see from the project setup, mimo configuration has one more radio_bridge instance for the second radio card. Also, the AGC pcore, the frame detection pcore and the TxRx pcore are different. However, none of these should prevent the green light on the radio board to be turned on.
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The three user LEDs on the radio board are controlled by the radio_controller core. By default, the red LED indicates loss of PLL lock in the radio; the yellow indicates receive mode; the green indicates transmit mode. When you're running a program like lab 6, where there is not much network traffic, the green LED will appear inactive. In fact, it is turning on very breifly each time a packet is transmitted.
All the labs in the workshop operate in SISO mode. The AGC, packet detection and OFDM TxRx cores all support SISO and MIMO modes, though the hardware platform must include two radio bridges to use MIMO.
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