[Discuss-gnuradio] Bandwidth loss in OFDM with USPR2 N210

2011-12-16 Thread Lixing Song
Hi, guys, I'm trying to use /ofdm/benchmark_tx.py and /ofdm/benchmark_rx.py in two machines to implement ofdm transmission. But I found there are too heavy packet loss or high BER with lot of '0' print out at the receiver. So I check the signal quality by using the received runing uhd_fft.py to

[Discuss-gnuradio] SNR Estimator

2011-12-13 Thread Lixing Song
Hi guys, Currently, I'm using GNUraido with UHD to do some research about SNR and BER. To estimate the SNR, I use the metric of a paper named Robust Frequency and Timing Synchonization for OFDM, IEEE Trans. Communications, vol. 45, no. 12, 1997, which has been implemented in the ofdm_sync_pn.py