Re: [Discuss-gnuradio] How to detect collision when two packets are transmitted simultaneously from two transmitters.

[Aditya Dhananjay]

Hi Sumedha,

1. You could perhaps look at the average power received over that time slot. If there is a collision, the receive power would ostensibly be higher.

2. Traditionally, a collision implied that nothing could be done, and the data was lost (unless one transmitter overwhelmed the other transmitter's signal, leading to the capture effect). However over the past couple of years, there have been techniques developed to recover packets from collisions. You could read the "Zig-Zag decoding" paper by Shyamnath Gollakota and Dina Katabi from SIGCOMM 2008.

http://groups.csail.mit.edu/netmit/wordpress/wp-content/themes/netmit/papers/ZigZag.pdf

Aditya

On Fri, Nov 8, 2013 at 8:44 AM, Sumedha Goyal <address@hidden> wrote:

I have a setup of one receiver and two transmitters. I am implementing a TDMA structure (using USRPs and GNURADIO) where only one packet is sent in each slot. When both transmitters try to transmit in the same slot, collision occurs. I would like to know

1. How can the receiver detect whether a collision has occurred or not?

2. What happens to the collided packets?

Regards,

Sumedha

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio