Date Submitted: [10−Nov−2007] Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [MPSK Modulation for PHY Layer Proposal for Chinese Band] Date Submitted: [10−Nov−2007] Source: [Liang Li, T.T. Liu, ChenYang Yang, Pei Liu, Bill Zhang] Company: [Vinno Technologies Inc, BUAA, Hisilicon Inc. ASTRI Inc.] Address: [Suite 402, Building D, No.2 Shangdi Xinxi Lu, Beijing 100085, China] Voice:[8610-82782373], FAX: [8610-82893004] E−Mail: [liangli@vinnotech.com, cyyangbuaa@vip.sina.com] Re: [802.15.4c] Abstract: [ ] Purpose: [To encourage discussion in 802.15.4c] Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. Liang Li (Vinno), C.Y. Yang (BUAA)

Nov 2007 Proposal A new PHY Proposal for low-rate WPAN that employs the MPSK modulation scheme with new DSSS sequences: MPSK is adopted as the basic modulation of communication for the LR-WPAN in the 780Mhz band. New DSSS sequences: 16 sequences for 4-bit mapping. Data rate = 250Kbps. Channel separation = 2MHz. The 1st null-null bandwidth = 750KHz. Pt < 10mw. Liang Li (Vinno), C.Y. Yang (BUAA)

The Important Operating Coefficients Nov 2007 The Important Operating Coefficients Band (MHz) Communication Coefficients Chip Rate (M chip/s) Modulation Bit Rate (Kbit/s) Symbol Rate (K symbol/s) 779-787 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)

DSSS Mapping (Symbol to Chips) Nov 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)

The DC component of one base sequence is Nov 2007 Pre-Processing Remove DC component The DC component 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)

Nov 2007 PPDY Packet The Preamble sequence is defined as: 8 symbols [0X00 0X00 0X00 0X00](128s), The SFD sequence is defined as: 2 symbols [0XA7](32s). Liang Li (Vinno), C.Y. Yang (BUAA)

Spread Sequences Advantage(1) Nov 2007 Spread Sequences Advantage(1) Distinguish auto-correlation property (Left: ones of 16-lenght Chirp sequence, Right: ones of 16-length Sequences in (915MHz) QPSK) Obtain better synchronization performance. Reduce inter-chip interference in multipath environments. -8 -6 -4 -2 2 4 6 8 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 t/Tc Auto-Correlation Property -8 -6 -4 -2 2 4 6 8 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 t/Tc Auto-Correlation Property Liang Li (Vinno), C.Y. Yang (BUAA)

Spread Sequences Advantage(2) Nov 2007 Spread Sequences Advantage(2) The correlation characteristic with frequency offset s(t) —preamble — time delay f—frequency offset Liang Li (Vinno), C.Y. Yang (BUAA)

Spread Sequences Advantage(2) Nov 2007 Spread Sequences Advantage(2) Distinguish correlation characteristic The Frequency offset consists of integral frequency offset and fractional frequency offset; The correlation characteristic is repeated on integral frequency offsets; The impact of integral frequency offset may be treated as that of the time delay, and has no effect on the timing; Only the fractional frequency offset affects the correlation characteristic. where kf1 is the integer frequency offset Liang Li (Vinno), C.Y. Yang (BUAA)

Spread Sequences Property of OQPSK Nov 2007 Spread Sequences Property of OQPSK The correlation characteristic of OQPSK with frequency offset s(t) —preamble —time delay f—frequency offset Liang Li (Vinno), C.Y. Yang (BUAA)

Nov 2007 Pulse Shaping Filter The Pulse Shaping Filter on I and Q paths is Raised-Cosine (α=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)

Waveforms and PSD of Transmit Signals Nov 2007 Waveforms and PSD of Transmit Signals 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 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -50 -40 -30 -20 -10 f [MHz] PSD BW=100KHz (f) [dBm] MPSK RC-0.5 PSD MASK -36dBm Liang Li (Vinno), C.Y. Yang (BUAA)

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

EVM, and Crest factor The Envelop is non-constant. Nov 2007 EVM, and Crest factor The Envelop is non-constant. The EVM and Crest Factor are: (RC-0.5-pulse shaping ): EVM [%] Crest factor [dB] MPSK-RC-0.5 0 (Nyquist) 2.87 Liang Li (Vinno), C.Y. Yang (BUAA)

Performance: Synchronization Performance Nov 2007 Performance: Synchronization Performance Simulation Condition: In AWGN channel, 20 data octets in each packet, sliding-correlation algorithm is used for sync . 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)

Performance: Demodulation Performance Nov 2007 Performance: Demodulation Performance Simulation Condition: In AWGN channel, ideal synchronization, Correlation demodulation, 20-octet data in each packet 4 5 6 7 8 9 10 -4 -3 -2 -1 E b /N PER MPSK (Coherent Detect) MPSK (Non-Coherent Detect) Liang Li (Vinno), C.Y. Yang (BUAA)

Performance Comparison Nov 2007 Performance Comparison Simulation Condition: In AWGN channel, Coherent Correlation demodulation, 20-octet data in each packet 4 5 6 7 8 9 10 -4 -3 -2 -1 E b /N PER Coherent Detect MPSK (ideal) MPSK (Sync) O-QPSK (ideal) O-QPSK (Sync) Liang Li (Vinno), C.Y. Yang (BUAA)

Performance Comparison Nov 2007 Performance Comparison Simulation Condition: In AWGN channel, Non-coherent Correlation demodulation, 20-octe data in each packet 4 5 6 7 8 9 10 -4 -3 -2 -1 E b /N PER Non-Coherent Detect MPSK (ideal) MPSK (Sync) O-QPSK (ideal) O-QPSK (Sync) Liang Li (Vinno), C.Y. Yang (BUAA)

Performance: Performance under Sync and Freq-offset Nov 2007 Performance: Performance under Sync and Freq-offset Simulation Condition: In AWGN channel, sliding correlation sync method and tranditional freq-offset estimation and correction, 20-octet data in each packet 4 5 6 7 8 9 10 -4 -3 -2 -1 E b /N PER MPSK 0ppm MPSK 20ppm MPSK 40ppm MPSK 60ppm Liang Li (Vinno), C.Y. Yang (BUAA)

Performance in Multipath Channel Nov 2007 Performance in Multipath Channel Tapped-Delay-Line Channel Model IEEE P802.15 Working Group for WPANs, Multipath Simulation Models for Sub-GHz PHY Evaluation, 15-04-0585-00-004b, Oct. 2004. 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. Flat Fading Channel Without rake receiver Frequency Selective Channel Liang Li (Vinno), C.Y. Yang (BUAA)

Performance: in Flat Fading Channel Nov 2007 Performance: in Flat Fading Channel Simulation Condition: In the Rayleigh fading channel, Delay Spread RMS = 0ns, with synchronization, 0ppm frequency offset, Non-coherent demodulation, 20-octet data in each packet 5 10 15 20 25 30 35 40 -4 -3 -2 -1 E b /N PER Liang Li (Vinno), C.Y. Yang (BUAA)

Performance: Under Multipath Channel Nov 2007 Performance: Under Multipath Channel Simulation Condition: In the Rayleigh multipath channel, Delay Spread RMS = 250ns, with synchronization, 0ppm frequency offset, Non-coherent demodulation, 20-octet data in each packet 5 10 15 20 25 30 35 40 -4 -3 -2 -1 E b /N PER Liang Li (Vinno), C.Y. Yang (BUAA)

Performance Comparison Nov 2007 Performance Comparison Simulation Condition: In the Rayleigh multipath channel, Delay Spread RMS = 250ns, with synchronization, 0ppm frequency offset, Non-coherent demodulation, 20-octet data in each packet 5 10 15 20 25 30 35 40 -4 -3 -2 -1 E b /N PER MPSK t rms = 0ns = 250ns O-QPSK Liang Li (Vinno), C.Y. Yang (BUAA)

Performance: In Multipath Channel Nov 2007 Performance: In Multipath Channel Simulation Condition: In the Rayleigh multipath channel, Delay Spread RMS = 250ns, with synchronization, Non-coherent demodulation, 20 data octets in each packet 5 10 15 20 25 30 35 40 -4 -3 -2 -1 E b /N PER MPSK (Rake) O-QPSK (Rake) MPSK (NoRake) O-QPSK (NoRake) Liang Li (Vinno), C.Y. Yang (BUAA)

PICS Item number Item description Reference Status Support N/A Yes No Nov 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)

Nov 2007 Summary Regulatory rules for China may require reduced side lobes: -36 dBm outside of the 779-787 MHz Band. The non-coherent demodulation of MPSK-RC can achieve same performance with differential MSK-type detectors, i.e. performance is same as the OQPSK mode @ 900 MHz. RC shaping is recommended w.r.t. EVM < 35% MPSK modulation is recommended as one of proposals to implement the PHY layer operation in LR-WPAN. Liang Li (Vinno), C.Y. Yang (BUAA)

Nov 2007 Backup Slides Liang Li (Vinno), C.Y. Yang (BUAA)

Promoted Communication Tech in LR-WPAN Nov 2007 Promoted Communication Tech in LR-WPAN 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 a = 0.5 = 0.8 Imag 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -50 -40 -30 -20 -10 f [MHz] PSD BW=100KHz (f) [dBm] MPSK RC-0.5 MPSK RC-0.8 PSD MASK -36dBm MPSK-RC-0.5: Crest factor (2.87dB), MPSK-RC-0.8: Crest factor (3.05dB) Liang Li (Vinno), C.Y. Yang (BUAA)

Performance Comparison Nov 2007 Performance Comparison Simulation Condition: In AWGN channel, with sync and freq-offset estimation and correction,20 data octets in each packet 4 5 6 7 8 9 10 -4 -3 -2 -1 E b /N PER MPSK 0ppm MPSK 20ppm MPSK 40ppm MPSK 60ppm O-QPSK 0ppm O-QPSK 20ppm O-QPSK 40ppm O-QPSK 60ppm Traditional freq-offset estimation method: Liang Li (Vinno), C.Y. Yang (BUAA)

Performance under Non-linear Power Amplifier Nov 2007 Performance under Non-linear Power Amplifier Correlation property with non-linear power amplifier The model of nonlinear PA was proposed by 15.4b group in 2004 -8 -6 -4 -2 2 4 6 8 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 t/Tc Correlation Property In the linear area In the saturated area +1.0 -1.0 Vout Vin Linear area of PA Saturated area of PA Liang Li (Vinno), C.Y. Yang (BUAA)

Promoted Communication Tech in LR-WPAN Nov 2007 Promoted Communication Tech in LR-WPAN The PSD before and after PA: Before PA After PA Liang Li (Vinno), C.Y. Yang (BUAA)