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[Discuss-gnuradio] Benchmark_rx is giving weird output for high bit rate

From: Nazmul Islam
Subject: [Discuss-gnuradio] Benchmark_rx is giving weird output for high bit rate
Date: Sat, 13 Aug 2011 19:38:29 -0400


This is Nazmul, a PhD student of Rutgers University. I am using a modified form of 'benchmark_Tx.py' and 'benchmark_Rx.py' for my research. I am transmitting a random binary sequence from an USRP2 testbed and calculating the bit error rate at the receiver (BER), another USRP2 testbed. Basically, I am generating a long binary sequence, grouping them into different packets and then transmitting the packets using 'benchmark_Tx' program. I receive the packets using 'benchmark_Rx.py' and then find the BER.

The program works well when bit rate is lower than 3 Mbps or 3.5 Mpbs. However, when the bit rate exceeds 3.5 Mbps, the benchmark_Rx produces a bunch of S characters. It produces a weird output like following!!


I don't know why this weird output occurs. Does it happen because I am exceeding the "capacity" of the path? Or is there an in built low pass filter at the receiver that only passes signals whose bandwidth is lower than 3 MHz? (let's say that I am using Differential BPSK here).

Your feedback on this will be highly appreciated.



Muhammad Nazmul Islam

Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.

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