BER of wireless modulation with USRP

Hi there
I have a trouble in measuring the BER of BPSK with 2 USRPs, one for Tx, and the other for Rx. The trouble is that the results are different from the simulation.
The VIs are included in the "Digital Wireless Communication: Physical Layer Exploration Lab using the NI USRP".
Attached are screen shots of signal consteration of both simulation and experiment with USRP.
I would appreciate any comments on the matter.
modulation type
BPSK
packet length (bits)
1000
# of Iterations
1000
filter parameter
1
noise power (dB)
0, -6
tx_hw params.ctl
device IP Address
active antennae
TX1
carrier frequency
915M
Gain
0
Generation mode
continuous
rx_hw params.ctl
device IP Address
active antennae
RX2
carrier frequency
915M
Gain
0
Attachments:
np0(simulation).png ‏279 KB
np0_rx(USRP).png ‏277 KB

hi i have same doubt i have MIMO transmitter
but i am transmitting 4 contellation sizes from 4 antennas ,they are 16-QAM,8-QAM,16-QAM,32-QAM
my modulation scheme is QAM
my MIMO receiver has to demdulate these antennas data with different constellation sizes
i want demodulate data from these 4 antennas using QAM demodulator
how it will be possible
please give the advice if any
thanku

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BER of wireless modulation with USRP

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