[Discuss-gnuradio] Introducing noise/ considerable BER

[shantharam balasubramanian]

Hi
I have been working in usrp2 testbed, and I have been modifying the benchmark_tx and rx programs for my project. There have been situations where I was supposed to introduce noise to find out BER. I did that by giving lower  transmitter amplitude values. But very low values cause packet loss along with higher BER values. I just want to know if there Is there anyway to just cause high BER values, without causing packet loss? Is there any way I can do that inside the program or should I do it by any other way e.g.by using some noise producing source?