Hi,
I am using the OFDM benchmark code in USRP2, where my system is Ubuntu 9.10
+ Gnuradio 3.2.2.
Basically I used the following scripting for TX and RX:
$ sudo python benchmark_ofdm_tx_new.py --mac-addr=00:50:c2:85:32:97 -f
2.462G -m qpsk -i 100 --tx-gain=30 -M 8 -s 1000 --fft-length=512
--occupied-tones=200 --cp-length=128
$ sudo python benchmark_ofdm_rx_new.py --mac-addr=00:50:c2:85:32:99 -f
2.462G -m qpsk -d 100 --rx-gain=30 --fft-length=512 --occupied-tones=200
--cp-length=128
As observed from spectrum analyzer, I found out the OFDM symbols are NOT
stably transmitting. Furthermore, the packet sending interval is large ( in
low rate)
Then, how can I control the sending rate/interval of OFDM packets?
The related code for "send_pkt" is as follows:
-------------------------------------------------------------
def send_pkt(self, payload='', eof=False):
"""
Send the payload.
@param payload: data to send
@type payload: string
"""
if eof:
msg = gr.message(1) # tell self._pkt_input we're
not sending any more packets
else:
info = ofdm_packet_utils.get_info(payload, self._regime,
self._symbol_time)
N_cbps = info["N_cbps"]
N_bpsc = info["N_bpsc"]
N_rate = info["rate"]
N_sym = info["N_sym"]
(pkt,Length) = ofdm_packet_utils.ftw_make(payload,self._regime,
self._symbol_time)
(pkt_scrambled,Length) = ofdm_packet_utils.scrambler(pkt,Length)
pkt_coded = ofdm_packet_utils.conv_encoder(pkt_scrambled, Length,
self._regime, N_cbps, N_bpsc, N_sym, N_rate)
pkt_interleaved = ofdm_packet_utils.interleaver(pkt_coded ,
self._regime, N_cbps, N_bpsc)
msg = gr.message_from_string(pkt_interleaved)
self._pkt_input.msgq().insert_tail(msg)
-----------------------------------------------------------------------------------
Thanks
--
Regards,
Guanbo
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