1. Submission Slide 1 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 Joint DSSS Proposal for 802.15.4g Merged proposal : 09-471, 09-283, 09-307 1 Michael Schmidt, 2 Y X Fu, 2 J Shen, 2 X Wang, 2 Haituo Liu, 2 L Li, 2 Z Zhao, 2 Z.F Zhao, 3 Ted Myers, 3 David Howard 1 Atmel, 2 Huawei/SIMIT/VINNO, 3 On-Ramp Wireless Supported by: John Buffington, Hartman Van Wyk, Daniel Popa, Itron Roberto Aiello

2. Submission Slide 2 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 Bands included No bandwidth limitation in bands –780MHz (China) 779 – 787 MHz –868MHz (EU) 863 – 870 MHz –915MHz (US) 902 – 928 MHz –2450MHz (Intl) 2400 – 2483.5 MHz

3. Submission Slide 3 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 DSSS benefits Better sensitivity increases range for hard to reach meters and challenging environments, especially in-building Good complement to Merge FSK Proposal Trade-off between processing gain and data rate with fixed bandwidth – long range for reduced data rate and short range for high data rate Different data rates can be obtained by simply changing the spreading gain, with same RF design

4. Submission Slide 4 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 Modulation O-QPSK –Raised cosine shape r=0.8 GMSK –Pre-coded –Equivalent to  /2 – BPSK (*) (*) for example see: Draft P802.15.3c/DF3, page 45: "a) The standard supports the use of MSK/GMSK modulations with appropriate filtering and pre-coding as an alternative way of generating π/2 BPSK waveform signals for the SC PHY mode."

5. Submission Slide 5 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 PSDU Channel Code ½ rate convolution code –Benefits Supports long frame requirements in PAR Provides larger gain compared to spreading as decrease data rate by ½ Used in IS-95 and other systems Consider interleave to improve resistance to burst interference –Interleaver Max depth of 32 information octets –Complexity Constraint length k=7

6. Submission Slide 6 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 779 – 787 MHz PHY Chip rate = 500kcps Channel center frequency (MHz) –779.5, 780.5, 781.5, 782.5, 783.5, 784.5, 785.5, 786.5 Spreading code –(4,4), (8,4), (16,4), (32,4) PSDU coded data rate (bps) –250k, 125k, 62.5k, 31.25k Preamble header spreading –(32,1)

7. Submission Slide 7 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 863 – 870 MHz PHY Chip rate = 200kcps Channel center frequency (MHz) –863.4, 873.8, 864.2, 865, 865.4, 866, 866.6, 867,2, 867.8, 868.3, 868.95 Spreading code –(4,4), (8,4), (16,4), (32,4) PSDU coded data rate (bps) –100k, 50k, 25k, 12.5k Preamble header spreading –(32,1)

8. Submission Slide 8 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 902–928MHz/ 2.400-2.483GHz PHY Chip rate = 1Mcps Channelization –400kHz channels (*) Spreading code –(32,4), (16,1), (32,1), (64,1) PSDU coded data rate –62.5k, 31.25k, 15.6k, 7.8k Preamble header spreading –(128,1) (*) 400kHz is chosen to simplify interoperability with Merged FSK proposal. Channels are overlapping, however system will choose every forth channel, in a scheme similar to 802.11.

9. Submission Slide 9 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 (N,1) - FEC Concatenation

10. Submission Slide 10 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 (N,4) - FEC Concatenation

11. Submission Slide 11 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 PPDU Format PHR Field –2 octets –Frame Length(11 bits) Indicate the frame length from 0 – 2047 bytes Compatible with PPDU Format of 802.15.4 -2006 –Date Rate Field (2 bits) Indicate the spreading sequence to binary data of PSDU, RX adjust receive PN sequence according to this field –Parity Check Field (1 bit) Check the PHR field Octets: 8124~2047 Bits: 64821121 PreambleSFDData Rate ModeFrame LengthReservedParity CheckPSDU Includes FCS

12. Submission Slide 12 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 NB FH co-existance DSSS channel overlaps a group of NB channels NB must hop within DSSS channel, then both hop to next DSSS channel DSSS receiver has ability to detect NB signals

13. Submission Slide 13 doc.: IEEE 802.15-09-0626-02-004g March 21, 2016 Example 1.2MHz DSSS and 200KHz FH (channel spacing) DSSS 1 FH1FH2FH3FH4FH5FH6 DSSS 2 FH21FH22FH23FH24FH25FH26 DSSS n FHn1FHn2FHn3FHn4FHn5FHn6