Hello, 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!! SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS 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. Thanks, Nazmul -- Muhammad Nazmul Islam Graduate Student Electrical & Computer Engineering Wireless Information & Networking Laboratory Rutgers, USA.
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