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CC1020 channel bandwidth and modulation scheme

yoko19298
Intellectual 395 points
Other Parts Discussed in Thread: CC1020

Hi all,

Using SmartRF I noticed that required (recommended) channel bandwidth is the same for NRZ, Manchester and UART modes of CC1020 (FSK mod.).
If I understand well

When using NRZ or UART the modulation frequency (baudrate or RF data rate) = bitrate at DIO pin
When using Manchester, modulation_frequency (baudrate or RF data rate) = 2 * bitrate at DIO pin

Choosing 9k6 data rate over RF and Manchester mode, at DIO pin will have 19k2, this is correct ?

Thanks in advance,

 

 

 

  • 0
    TI__Mastermind 39860 points

    The signal bandwidth cab be estimated by Carson's rule as 2*fm + 2*f_dev, where fm is the highest modulating frequency and f_dev is the frequency deviaton.

    For NRZ the highest modulating frequency will be if you transmit a 0-1 sequence. If the data rate is 19.2 kBaud, fm for the 0-1 sequence will be 9.6 kHz.

    For Manchester modulation the highest modulating frequency will be if you transmit a continuous sequence of 0's or 1's. If the data rate is 19.2 kBaud, fm for the 0 (or 1) sequence will be 9.6 kHz.

    For the same BAUD rate, NRZ and Manchester signals will have similar signal bandwidths.