GSM Muti-antenna Receiver

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天行 tianxing at timelink.com.hk
Sun Oct 23 13:01:37 UTC 2011


Hi all:


     I try make usrp work on Muti-antenna mode , 1 to downlink , 1 to uplink.
     first , i only decode downlink, it can found FCCH,but can't decode sch. 
     any suggestion?


tianxing at tianxing-MS-7345:~/gsm/airprobe-gprs/gsm-receiver/src/python$ ./gsm_reive_usrp_mono.py -c 122 
A side: Flex 900 Rx MIMO B
B side: Flex 900 Rx MIMO B
gain_a: 45.0
gain_b: 45.0
A side: The carrier frequency is set as  959400000.0
B side: The carrier frequency is set as  959400000.0
mux_val = 0x2301
input_rate: 571428.571429 sample rate: 0.527472527473  filter_cutoff: 145000.0  filter_t_width: 10000.0
>>> gr_fir_ccc: using SSE
input_rate: 571428.571429 sample rate: 0.527472527473  filter_cutoff: 145000.0  filter_t_width: 10000.0
>>> gr_fir_ccf: using SSE
Key: '0000000000000000'
Configuration: '0C'
  Configuration TS: 0
configure_receiver
1319360150.211137 3014114160: fcch found on position: 24508
1319360150.211206 3014114160: freq_offset: -2659.853516
1319360150.254086 3014114160: fcch found on position: 77189
1319360150.254132 3014114160: freq_offset: -261.283386
sch.c:260 ERR: conv_decode 11
1319360150.307770 3014114160: fcch found on position: 135276
1319360150.307814 3014114160: freq_offset: -2574.190186
sch.c:260 ERR: conv_decode 10
1319360150.352075 3014114160: fcch found on position: 188023
1319360150.352120 3014114160: freq_offset: -375.097321
sch.c:260 ERR: conv_decode 8
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