How to correct for IQ rates which are not supported by the NOR-2920?

Hi all;

I use Labview 11 and the NOR-2920 (Ettus Radio) to build a FSK receiver, I the Modulation toolkit.

My carrier is 169 MHz, my flow is 256Kbits/sec, my tour of frequency is around 89. 5 kHz, I choose a 16, my symbols FSK samples/symbol is 2 (0-1).

My receiver is close to work, however, I am getting an extra of 5 bits in my 408 bits frame data.

My sync bits are all the tail and the front end of my frame data which has also a meter 16-bit images on the front of the frame, which runs from 0 to 65535 without losing data.

I think that the extra bits are the result of rate IQ I try to set to 4096K based on 256 K * 16 = 4096 K

The radio seems to default to 4,166667 M for the rate of IQ.

The ratio of 408bits /415bits = 4096/4166 coincidence or not?

Is there a way around this problem in the configuration of the NOR-2920 or how I manage the sampling and recovery of data.

Any guidance would be greatly appreciated.

Don3of4

All interested for:

The answer is Labview a an I / Q resample module.

Connection between the extraction of radio and the demodulation modules, set the sampling frequency entry real want = rate * of the data samples / symbol.

Work so far, don't know what is happening when other tolerances overclocking begin to influence the data, but for now his work.  Also don't know why this is not incorporated into the receiver or the fetch modules for sampling rate that you actually need from the beginning but I'm still learning.

Don3of4

Tags: NI Software

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