1. Date Submitted: [30−Aug−2007]
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [MPSK Modulation for PHY Layer Proposal for Chinese Band]
Date Submitted: [30−Aug−2007]
Source: [Liang Li, ChenYang Yang T.T. Liu, Pei Liu, Dixon Paul] Company: [Vinno Technologies Inc, BUAA, Hisilicon Inc. ]
Address: [Suite 402, Building D, No.2 Shangdi Xinxi Lu, Beijing , China]
Voice:[ ], FAX: [ ]
E−Mail:
Re: [ c]
Abstract: [ ]
Purpose: [To encourage discussion in c]
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
Liang Li (Vinno), C.Y. Yang (BUAA)

2. Aug 2007
Proposal
A new PHY Proposal for low-rate WPAN that employs the MSPK modulation scheme with new DSSS sequences:
The MPSK tech is adopted as the basic modulation of communication in LR-WPAN at 780mhz New DSSS sequences: 16 sequences for 4-bit mapping.
Data rate =250Kbps.
Channel separation = 2MHz.
The 1st null-null bandwidth = 750KHz.
Liang Li (Vinno), C.Y. Yang (BUAA)

3. The Important Operation Coefficients
Aug 2007
The Important Operation Coefficients
Band (MHz)
Communication Coefficients
Chip Rate
(M chip/s)
Modulation
Bit Rate (Kbit/s)
Symbol Rate (K symbol/s) 1
MPSK
250
62.5
Fc=780, 782, 784, 786 MHz
The Transmit Path (I or Q Paths)
Liang Li (Vinno), C.Y. Yang (BUAA)

4. DSSS Mapping (Symbol to Chips)
Aug 2007
DSSS Mapping (Symbol to Chips)
The Direct Sequence Spread Spectrum (DSSS) tech is applied
16 orthogonal spreading sequences are designed to map 4 information bits. The base sequence is a 16 length chirp sequence and the other 15 sequences are its cyclic shifts.
Liang Li (Vinno), C.Y. Yang (BUAA)

5. The DC components of one base sequence is
Aug 2007
Pre-Processing
Remove DC component
The DC components of one base sequence is
Subtract ADC from each chip directly in the processing, all DC components of PPDU can be mitigated.
Liang Li (Vinno), C.Y. Yang (BUAA)

6. Proposal for preamble SFD Processing
Aug 2007
Proposal for preamble
SFD Processing
---- The SFD sequence is the conjugate of the Preamble sequence
The Phase sequence of Preamble is:
The Phase sequence of SFD is:
Liang Li (Vinno), C.Y. Yang (BUAA)

7. Aug 2007
Pulse Shaping Filter
The Pulse Shaping Filter on I and Q path is Raise-Cosine ( t=0.5 ): -2
-1.5 -1
-0.5
0.5 1
1.5 2
-0.2
0.2
0.4
0.6
0.8
t [Tc]
Pluse Shape -2
-1.5 -1
-0.5
0.5 1
1.5 2
-60
-50
-40
-30
-20
-10
f [MHz]
PSD (dB)
Liang Li (Vinno), C.Y. Yang (BUAA)

8. Aug 2007
Modulation MPSK
Liang Li (Vinno), C.Y. Yang (BUAA)

9. Aug 2007
Proposal for preamble
The preamble field proposed here consists of at least 4 octets, which is same as ones of OQPSK at 915MHz of IEEE
Liang Li (Vinno), C.Y. Yang (BUAA)

10. Promoted Communication Tech in LR-WPAN(4)
Aug 2007
Promoted Communication Tech in LR-WPAN(4)
The Transmit waveforms (I and Q) and Spectrum are:
( Condition: RC shaping filter, Random chip sequence, 100 kHz resolution band width, 0 dBm TX-power ) 2 4 6 8 10 12 14 16 -1
-0.5
0.5 1
Real
t / Tc
Imag -2
-1.5 -1
-0.5
0.5 1
1.5 2
-60
-50
-40
-30
-20
-10 10 20
f/MHz
PSD
Liang Li (Vinno), C.Y. Yang (BUAA)

11. Minimum Receiver Jamming Resistance Requirement
Aug 2007
PSD in the Band
PSD requirements in Band
Minimum Receiver Jamming Resistance Requirement
Liang Li (Vinno), C.Y. Yang (BUAA)

12. EVM, Crest fractor and Constellation Chart
Aug 2007
EVM, Crest fractor and Constellation Chart
Constellation chart
(RC-pulse shaping):
MPSK Constellation Chart
(Nyquist sampling points) -2
-1.5 -1
-0.5
0.5 1
1.5
Real Part
Imag Rart
EVM [%]
Crest factor [dB]
MPSK-RC-0.5
0 (Nyquist)
2.87
Liang Li (Vinno), C.Y. Yang (BUAA)

13. Performance: Synchronization Performance
Aug 2007
Performance: Synchronization Performance
Simulation Condition: In AWGN channel, ideal synchronization,
20 data octets in each packet, sync algorithm is sliding correlation. 4
4.5 5
5.5 6
6.5 7
7.5 8
8.5 9 10 -6 -5 -4 -3 -2 -1 E b /n
Sync Error Rate
Liang Li (Vinno), C.Y. Yang (BUAA)

14. Performance: Demodulation Performance
Aug 2007
Performance: Demodulation Performance
Simulation Condition: In AWGN channel, ideal synchronization,
Correlation demodulation, 20 data octets in each packet 4
4.5 5
5.5 6
6.5 7
7.5 8
8.5 9 10 -4 -3 -2 -1 E b /n
PER
Liang Li (Vinno), C.Y. Yang (BUAA)

15. Performance: Performance under sync and freq-offset
Aug 2007
Performance: Performance under sync and freq-offset
Simulation Condition: In AWGN channel, with sync and freq-offset Estimation,
20 data octets in each packet 4
4.5 5
5.5 6
6.5 7
7.5 8
8.5 9 10 -4 -3 -2 -1 E b /n
PER
AWGN
+/-20ppm
+/-40ppm
+/-80ppm
+/-120ppm
Liang Li (Vinno), C.Y. Yang (BUAA)

16. Performance in Multipath Channel (1)
Aug 2007
Performance in Multipath Channel (1)
Tapped-Delay-Line Channel Model
IEEE P Working Group for WPANs, Multipath Simulation Models for Sub-GHz PHY Evaluation, b, Oct
Power delay profile is exponentially declined.
Each path is independently Rayleigh fading.
The average power of the channel response over many packets is 1, but in each packet the power is varied.
Short Delay Environments
Without rake receiver
Long Delay Environments
With 3-tap rake receiver
Liang Li (Vinno), C.Y. Yang (BUAA)

17. Performance in Multipath Channel (2)
Aug 2007
Performance in Multipath Channel (2)
Test Conditions
RMS delay spread 0~250ns
Tx nonlinear amplifier, Rapp’s model, p=3, backoff=1.5dB
Tx and Rx frequency offset ±80ppm, phase noise
Tx and Rx IQ imbalance 2dB, 10o
3bit AD sampling, 8bit baseband processing
Rx will implement time and frequency synchronization and data detection
5000 packets are tested for each SNR, each packet comprises 20 octets
The packet error rate is counted for 90% coverage
Liang Li (Vinno), C.Y. Yang (BUAA)

18. PER in Short Delay Environments without Rake Receiver
Aug 2007
PER in Short Delay Environments without Rake Receiver 10 11 12 13 14 15 16 17 18 19 20
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5 E b /N
(dB)
PER
0 ns
50 ns
100 ns
250 ns
Liang Li (Vinno), C.Y. Yang (BUAA)

19. PER in Long Delay Environments with 3-tap Rake Receiver
Aug 2007
PER in Long Delay Environments with 3-tap Rake Receiver 10 11 12 13 14 15 16 17 18 19 20
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5 E b /N
(dB)
PER
0 ns
100 ns
200 ns
300 ns
400 ns
500 ns
600 ns
Liang Li (Vinno), C.Y. Yang (BUAA)

20. PICS Item number Item description Reference Status Support N/A Yes No
Aug 2007
PICS
Table C.4 Radio Frequencies
Item number
Item description
Reference
Status
Support
N/A
Yes No
RF1
868 / 915 MHz PHY
O.3
RF1.1
Sub-1-Ghz 600kHz (20 kbit/s) M
RF1.2
Sub-1-Ghz 2 MHz (40 kbit/s)
RF1.3
Sub-1-Ghz 2 Mhz (250 kbit/s) O
RF1.4
Sub-1-Ghz 600 kHz (100 kbit/s)
RF1.5
Sub-1-Ghz 780 kHz (250 kbit/s)
RF2
2450 Mhz PHY 5 Mhz (250 kbit/s)
Liang Li (Vinno), C.Y. Yang (BUAA)

21. Aug 2007
Summary
Regulatory rules for China may require reduced side lobes: -36 non specified distance from carrier
Robust non-coherent detection of MPSK-RC can be achieved with well-known differential MSK-type detectors with no loss in performance, i.e. performance is same as the OQPSK 900 MHz
RC shaping is recommended w.r.t. EVM < 35%
The MPSK modulation are recommended as one of proposals to implement the PHY layer operation in LR-WPAN.
Liang Li (Vinno), C.Y. Yang (BUAA)