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[Discuss-gnuradio] Simultaneous transmission and reception

From: pratik hetamsaria
Subject: [Discuss-gnuradio] Simultaneous transmission and reception
Date: Tue, 3 Jul 2007 15:37:43 +0100 (BST)

Hi Everyone

I am currently trying to make a USRP transceiver run, which is based on TDMA approach.Elaborating on it, it should be a system which works in receive mode for sometime, writes the data in a file and in the next slot transmits the data which has been written in the file.

Reading from the previous archives, I figured out that switching between the modes can be done by setting the "set_auto_tr(True)".
The switching works lovely when writing reading and is done into and from different files. But as soon as the same file is used, problem starts.

I have been working on tx_voice.py and rx_voice.py. I start the receiver first so that it writes onto the file. After few seconds, i start the transmitter and then after every 5 seconds I make the transmit mode go to sleep for another 5 seconds. But, the problem is that it works fine for some time but after that the transmit mode stops and the receiver keeps on receiving more packets and then we dont get into the transmit mode. The transmit mode stops even though the number of packets written to file are more than read. Maybe this could  be a problem of buffering or something because if i keep the transmission in repeat mode then the transmit mode doesnt stop. However In my case, i dont want the transmission in repetition mode. I only want to transmit whatever i have received. I have also ensured that the rates of receiveing and transmission are the same.

Could anybody please help me out with the situation.I just want to retransmit the data received from USRP.

Thanks for all the help in advance
Pratik Hetamsaria

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