Abstract: [Final proposal for d, that is for the low cost and low power consumption WPAN.]

Transcription

1 Project: IEEE P Working Group for Wireless Personal Area Networks N (WPANs( WPANs) Title: [Final Proposal for d from OKI] Date Submitted: [17-March-2008] Source: [Kiyoshi Fukui, Yasutaka Kawamoto] Company [Oki Electric Industry Co., Ltd.] Address [2-5-7 Hommachi, Chuo-ku, Osaka , Japan] Voice:[ ], FAX: [ ], [fukui535@oki.com kawamoto728@oki.com] Re: [ d] Abstract: [Final proposal for d, that is for the low cost and low power consumption WPAN.] Purpose: [To explain our proposal and discussion in d.] Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P Slide 1

2 Summary OKI proposes low cost and low power consumption PHY Modulation method: GFSK Number of channels 1mW: 10 channels + 2 optional channels 10mW: 2 channels Data rate: 100kbps GFSK specification and performance GFSK s CCA-SD Slide 2

3 OKI s proposal Slide 3

4 Modulation parameters Channel spacing 400kHz Bit Rate (kbit/s) 100 Modulation parameters Symbol Rate (k sym/s) 100 Modulation type* GFSK BT 0.5 Modulation Index (h) (*Our proposal does not use spread spectrum technology) Modulation polarity "1" is transmitted by shifting the frequency higher than the channel center, "0" is transmitted by shifting the frequency lower than the channel center. 1 Transmitter functions Bit in PPDU Bit Symbol data whitening (PN9) Gaussi an Fil tering FSK modulation Modulated signal 1bit=1symbol x 9 + x BT=0.5 h = 1 Slide 4

5 Channel plan Reader channel of Miller sub-carrier RFID Antenna power = 1mW Response channel of Miller sub-carrier RFID 0dBm -20dBm/10kHz -39dBm/100kHz -55dBm/10kHz 950MHz (ch1) (ch2) (ch3) (ch4) (ch5) (ch6) (ch7) (ch8) (ch9) (ch10) (ch11) (ch12) (ch13) (ch14) (ch15) (ch16) (ch17) (ch18) (ch19) (ch20) (ch21) (ch22) (ch23) (ch24) 956MHz 952MHz 954MHz 955MHz ch 1 ch 2 ch 3 ch 4 ch 5 ch6 ch 7 ch 8 ch 9 ch 10ch 11 ch 12 Antenna power = 10mW 10dBm When to use ch 5 and ch 8, it have to do additional carrier sense on ch 4 and ch 7 respectively. So, ch 5 and ch 8 should be made optional. -10dBm -39dBm/10kHz 給電点 送信電力 MHz (ch17) (ch18) (ch19) (ch20) 956MHz 950.8MHz 952MHz 954MHz 955MHz 955.8MHz Slide 5 ch 9 ch 10

6 Channel plan 0dBm -20dBm/10kHz -39dBm/100kHz Antenna power = 1mW -55dBm/10kHz 950MHz (ch1) (ch2) (ch3) (ch4) (ch5) (ch6) (ch7) (ch8) (ch9) (ch10) (ch11) (ch12) (ch13) (ch14) (ch15) (ch16) (ch17) (ch18) (ch19) (ch20) (ch21) (ch22) (ch23) (ch24) 956MHz 952MHz 954MHz 955MHz ch 1 ch 2 ch 3 ch 4 ch 5 ch6 ch 7 ch 8 ch 9 ch 10ch 11 ch 12 Antenna power = 10mW 10dBm -10dBm Same channel allocation can be used in both 1mW and 10mW. -39dBm/10kHz 給電点 送信電力 MHz (ch17) (ch18) (ch19) (ch20) 956MHz 950.8MHz 952MHz 954MHz 955MHz 955.8MHz Slide 6 ch 9 ch 10

7 Preamble&SFD Octets 1 variable Preamble SFD Frame length(7bit) Reserve (1bit) PSDU SHR PHR PHY payload No Data whitening Data Whitening Preamble length and SFD are compatible with b Preamble size; 4 bytes SFD; 1byte( b) Preamble character is modified from b Preamble character; 0xAA Slide 7

8 Data whitening Transmitter PHR PHY payload Data whitening Scrambled PHR and PHY paylolad PHR PHY payload Preamble SHR PHR PHY payload PN9 Receiver Descrambled PHR and PHY payload Data de-whitening PHR PHY payload PHR PHY payload PHR PHY payload PN9 Slide 8

9 Advantages of proposed GFSK PHY? Low current consumption A high efficient non-linear amplifier can be used Low complexity modem Low cost LSI Low complexity modem Small area of LSI Low emission outside the 400kHz channel Meets Japanese Regulations at both 10 and 0dBm output power Slide 9

10 Why 400kHz channel spacing? Two 10mW channels available Only one single channel available when 600kHz bandwidth is used Both 1mW and 10mW can use identical channel allocation Max data rate in 200kHz is too low When 200kHz channel spacing is used the Phase Noise of the LO needs to be very low in order to meet Japanese Regulations" Will increase power consumption of LSI Slide 10

11 Power spectrum Slide 11

12 Power emission In channel power is defined as integrated power over + and 200kHz around the channel center. Adjacent channel power is defined as integrated power over + and 100kHz around an offset of 300kHz away from the channel center. Out of channel power is defined as integrated power over + and 50kHz around an offset of 350kHz away from the channel center. Freq. Offset (khz) In channel power (dbm) Adj. channel power (dbm) Regulation limit adj. channel (dbm) Out of channel power (dbm) Regulation limit Out of channel (dbm) Slide 12

13 PER vs Eb/No in AWGN channel 1000 packets per data point GFSK, h=1, BT=0.5, Rb=100kbps frequency offset (0, 40 & 80ppm) Modem includes AFC (Automatic Frequency Control) Bit clock recovery Sync word detection Robust against frequency error Slide 13

14 PER vs Eb/No in Flat Fading channel 1000 packets per data point GFSK, h=1, BT=0.5, Rb=100kbps Flat fading according to: doc b No frequency error Modem includes AFC (Automatic Frequency Control) Bit clock recovery Sync word detection Slide 14

15 PER vs Eb/No in Delay Spread channel 1000 packets per data point GFSK, h=1, BT=0.5, Rb=100kbps Flat fading according to: doc b RMS delay spread = 250ns No frequency error Modem includes AFC (Automatic Frequency Control) Bit clock recovery Sync word detection Slide 15

16 PER vs Eb/No all cases Slide 16

17 Susceptibility for RFID interference Measurements and simulation show: CW co-channel immunity = -8.5dB It means that CW interferer needs to be at least 8.5dB below the desired channel power for BER < 1E-3. Slide 17

18 CCA-SD for GFSK Slide 18

19 GFSK s CCA-SD GFSK s Signal detection Example of implementation Mod Out CK Out Symbol Timing Recov. Phase Error Thresh Avg. CS From Doc:IEEE802.11/94-67 Slide 19

20 Backup slides Slide 20

21 Japanese regulation overview (1/3) Frequency band 950.8MHz-955.8MHz (5.0MHz) Channel bandwidth (200 x n) khz (n is integer from 1 to 3) Antenna power 1mW or less for all unit radio channel 10mW or less for unit radio channels from 954MHz to 955MHz Slide 21

22 Japanese regulation overview (2/3) PSD mask Level of channel edge: 20dBc Power of adjacent channel: less than -18dBm (10mW) less than -26dBm (1mW) 1mW 200kHz 200kHz 200kHz 10mW 200kHz 200kHz 200kHz 10dBm 0dBm -20dBm -20dBc -10dBm -20dBc -39dBm/100kHz -39dBm/100kHz -26dBm/200kHz fc-200khz fc fc+200khz -18dBm/200kHz fc-200khz fc fc+200khz Slide 22

23 Japanese regulation overview (3/3) Channel allocation Antenna power = 1mW (It is 200kHz channel allocation) 0dBm -20dBm/10kHz -39dBm/10kHz -55dBm/10kHz 950MHz (ch1) (ch2) (ch3) (ch4) 950.8MHz (ch5) (ch6) 952MHz (ch7) (ch8) (ch9) (ch10) (ch11) (ch12) (ch13) (ch14) (ch15) (ch16) (ch17) 954MHz (ch18) (ch19) (ch20) (ch21) 955MHz (ch22) (ch23) (ch24) 956MHz 955.8MHz Antenna power = 10mW 10dBm 0dBm -10dBm/100kHz -39dBm/100kHz -55dBm/100kHz 950MHz 950.8MHz 952MHz (ch1) (ch2) (ch3) (ch4) (ch5) (ch6) (ch7) (ch8) (ch9) (ch10) (ch11) (ch12) (ch13) (ch14) 954MHz 955MHz 955.8MHz 956MHz Slide 23

24 Power spectrum Slide 24

25 Comparison between GFSK and BPSK-DSSS Data rate Frequency efficiency Complexity Power consumption CCA-CS Market GFSK High (100kbps) 1/4 Low Low Easy signal detection Only JP BPSK-DSSS Low (20kbps) 1/30 High High Easy signal detection JP and EU Slide 25