Dear everyone:
You see in the FPGA codec datas are interpolated into 32Msps and sended to
AD9862. Then AD9862 interpolates the datas by 4. But AD9862 is configured to
latch datas using CLKOUT1,and CLKOUT1 is 64M. Though CLKOUT1 is not linked to
FPGA, it seems a little confilcting.
So can
Dear everyone:
Recently I have been doing my graduation design, wchich is the implemention
of 802.11a ofdm PHY. My tutor required me to use FPGA so I implemented baseband
OFDM modulation-demodulation using Virtex5 FPGA. My tutor decided not to use
USRP because the RF bandwidth is too limited.
Hello everyone:
You see in theory there should be a low-pass filter after ADC for
eliminating the image. Also after DDC there should also be a
filter. But in USRP there are not such things. So do the cic filter and half
band filter implement that function besides decimation?
Best regards___
about that. If I am wrong
please correct me.
Best regards
At 2012-06-19 09:54:11,"Marcus D. Leech" wrote:
On 18/06/12 09:46 PM, signalswdm wrote:
Hello everyone:
You see in theory there should be a low-pass filter after ADC for
eliminating the image. Also after DDC there should
Dear everyone:
Is there a method that I can read daughterboard eeprom from python? Or is
there anyway that I can know what stored in the daughterboard eeprom in a
visible way?
Best regards___
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Dear everyone:
In ofdm_receiver.py there is chan_coeffs =
gr.fihan_coeffs(1.0,1.0,tb+bw,tb,gr.firdes.WIN_HAMMING), which is to determine
the parameters of fir low-pass filters. My question is about the third
parameter, which denotes the center of transition band, and it is computed as
tb= bw
Dear everyone:
In the FPGA code of halfband_decim,v of USRP1, it has a input strobe_in,
which indates a new data comes. Strobe_in is determined by the decimation rate.
For example if we decimate by 6 we write to the register FR_DECIM_RATE 6/2-1=2
and strobe_in comes high every 3 clocks.
Hello everyone：
You see there are 63 registers in AD9862, which are configured by SPI. It
seems in usrp_stand.cc and usrp_basic.cc there are codes about how to write and
read AD9862 registers, but I still have not yet found the exact values written
into all the 63 AD9862 registers.
Ca
Dear everyone:
You see in usrp_basic.h there is a function named _write_9862() and it
uses function usrp_9862_write(),defined in usrp_prims_common.h. And
usrp_9862_write() uses function usrp_spi_write(), also defined in
usrp_prims_common.h.
usrp_spi_write() uses function write_cmd(), defin
Dear everyone:
Recently I am studying the codes about daughterboard xcvr2450(mainly
usrp\host\lib\db_xcvr2450.c) and there are some problems confuse me.
1. You see there are two steps in setting the frequency. First daughter
board tunes as close as the target fequency and return the act
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