SWRA696A April   2021  – November 2021 CC1352P , CC1352P7 , CC1352R

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Acronyms Used in This Document
  3. 2DSSS Encoding Scheme
    1. 2.1 Convolutional Encoder
    2. 2.2 Direct Sequence Spreader
  4. 3Packet Format
  5. 4Setting Up WB-DSSS in SmartRF Studio
  6. 5Setting Up WB-DSSS in Code Composer Studio
  7. 6Measured Results
    1. 6.1 Receiver Performance
      1. 6.1.1 DSSS = 1, 240 kbps, 2-GFSK, 195 kHz Deviation, 1x Spreading
      2. 6.1.2 WB-DSSS 120 kbps, 2-GFSK, 195 kHz Deviation, 2x Spreading
      3. 6.1.3 WB-DSSS 60 kbps, 2-GFSK, 195 kHz Deviation, 4x Spreading
      4. 6.1.4 WB-DSSS 30 kbps, 2-GFSK, 195 kHz Deviation, 8x Spreading
      5. 6.1.5 WB-DSSS Frequency Offset Tolerance
    2. 6.2 Transmitter Performance and FCC 15.247 Measurements
      1. 6.2.1 WB-DSSS 240 kbps, 2-GFSK, 195 kHz Deviation, 1x Spreading
      2. 6.2.2 WB-DSSS 120 kbps, 2-GFSK, 195 kHz Deviation, 2x Spreading
      3. 6.2.3 WB-DSSS 60kbps, 2-GFSK, 195 kHz Deviation, 4x Spreading
      4. 6.2.4 WB-DSSS 30 kbps, 2-GFSK, 195 kHz Deviation, 8x Spreading
  8. 7References
  9. 8Revision History

2 DSSS Encoding Scheme

The DSSS scheme is depicted in Figure 2-1. A convolutional encoder of rate ½ is followed by a direct sequence spreader with variable spreading length. The output of the module is fed into the 2-GFSK modulator to produce the modulated GFSK signal.

GUID-A3FF9824-EC5E-48E4-B323-52F120389FB7-low.gif Figure 2-1 WB-DSSS Coding Scheme (the modulator is 2-GFSK)

The following subsections briefly discuss the workings of the first two main blocks shown in Figure 2-1.