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Symbol vs Baud rate CC1310 Smartrf Studio 7 v2.3.1

Saycoda
Expert 1580 points

I'm working with the SmartRF06, CC13xxEM, and SmartRF Studio. There are three canned RF Parameter settings for 2-GFSK, LRM, & OOK. In each case except LRM the "baud" rate matches the "symbol" rate. 50Kbps<>50kBaud, 4.8kbps<>4.80042 kBaud, but the LRM (which I believe is a spread-spectrum technique) is listed as follows; 0.625 kbps<>10.000kBaud. I could not find any info in regards to this. Two questions;

1) why do they differ?

2) If I change the "Symbol Rate" to 30.00kBaud what is the net affect?

Thanks in advance.

  • 0
    TI__Genius 13620 points
    The symbol rate is the chip rate for the LRM modulation. LRM is using DSSS 8 and half rate FEC (c.f. datasheet), so with a chip rate of 10 kbps, you get 10000 / 2 / 8 = 625. Higher symbol rates gives proportionally higher effective bit rate.