March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 1

doc.: IEEE 802.15-03/107r0

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [Modulation and Coding Scheme for 802.15.3a]Date Submitted: [3 March, 2003]Source: [Francois Chin, Madhukumar, Xiaoming Peng, Sivanand] Company [Institiute for Infocomm Reseaerch (Singapore)]Address []Voice:[], FAX: [], E-Mail:[chinfrancois@i2r.a-star.edu.sg]

Abstract: []

Purpose: [Provide background information and analysis regarding how 802.15.3 modulation and coding schemes can be employed and how they perform in UWB channels]

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.

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 2

doc.: IEEE 802.15-03/107r0

Submission

Outline

• Proposed use of UWB band

• Proposed Modulation and Coding Scheme

• System performance

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 3

doc.: IEEE 802.15-03/107r0

Submission

Proposed use of UWB band

Proposed Plan for Operating Frequency Bands

15 frequency sub-bands (500MHz each) within 3.1 – 10.6 GHz bands

• Centre frequency of sub- bands = 3.35 + (k-1)*0.5 GHz

• Merits

•Different frequency channels (consisting disjoint set of sub-bands) are allocated to simultaneous operating piconets

•Adjacent channel (consisting disjoint set of sub-bands) interference is suppressed to certain extend by receiver sub-band circuitry

•Coexistence with IEEE 802.11a is ensured as sub-bands centred at 5.35GHz or 5.85 GHz can be avoided, leaving others for 4 simultaneous operating piconets

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 4

doc.: IEEE 802.15-03/107r0

Submission

Frequency sub-band scanning

• When a device is scanning to start a piconet, it should scan 15 frequency sub-bands (500MHz each) within 3.1 – 10.6 GHz to reduce the probability of selecting a occupied sub-band

• The device should rate the sub-bands based on an estimate of the amount of traffic and the power level in each sub-band

• The device then chooses those sub-bands that has traffic or/and power levels that is below a specific threshold

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 5

doc.: IEEE 802.15-03/107r0

Submission

Key features of PHY proposal• Modulation format and coding schemes

•As proposed in 802.15.3 – device shall, at a minimum, support QPSK modulation

• QPSK & QAM modulator – to produce baseband signal that will excite the transmit circuitry to launch a pulse in one of the proposed frequency sub-band

• Fast switching reference PLL, switching at Pulse Repetition Frequency (PRF), together with quadrature mixer for frequency translation, to translate each pulse to and from its designated frequency sub-band

• Multiple PRFs are chosen to allow ‘grading’ of devices and to avoid intersymbol interference

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 6

doc.: IEEE 802.15-03/107r0

Submission

Transmit Signals

• Consecutive pulses are transmitted over different sub-bands at a rate of PRF

f0 f1 f2 f3 f4 f5 f6 f7

PRF = 250 MHz

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 7

doc.: IEEE 802.15-03/107r0

Submission

Proposed Modulation, Coding, PRF, Payload Bit Rates & Data Throughput

Modulation Type

Coding PRF

62.5MHz 125MHz 250MHz

QPSK 8-state TCM 62.5Mbps**

(55Mbps)

125Mbps

(110Mbps)

250Mbps

(200Mbps)

DQPSK

(Base Mod.)

None 125Mbps

(110Mbps)

250Mbps

(200Mbps)

500Mbps

(350Mbps)

16-QAM 8-state TCM **Payload Rb

(min PHY-SAP Data Tput)

375Mbps (300Mbps)

750Mbps

(480Mbps)

32-QAM 8-state TCM 500Mbps (350Mbps)

1000Mbps

(600Mbps)

64-QAM 8-state TCM 312.5Mbps (200Mbps)

625Mbps (400Mbps)

1250Mbps

(700Mbps)

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 8

doc.: IEEE 802.15-03/107r0

Submission

PRF / Symbol Transmission Rate

• Multiple Pulse Repetition Frequencies (62.5/125/250 MHz) provides scalability to– Power consumption– Payload bit rate– PHY-SAP data throughput

• Low target PHY-SAP data throughput, payload bit rate and low basic bit rate (for preamble, PHY/MAC header) that is associated to low PRF ensures low power consumption level

• If a device supports a PRF, it should also support all lower PRF

• PRF should remains within a frame transmission

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 9

doc.: IEEE 802.15-03/107r0

Submission

Base Modulation Scheme & Basic Bit Rate

• Uncoded DQPSK is used as the base modulation scheme for Preamble, PHY header and MAC header

uncoded DQPSK

(Basic Modulation )

PRF

62.5MHz 125MHz 250MHz

Basic Bit Rate 125Mbps 250Mbps 500Mbps

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 10

doc.: IEEE 802.15-03/107r0

Submission

PHY Frame Format• Almost identical to that in 802.15.3

Modulation Type

Coding PRF

62.5MHz 125MHz 250MHz

QPSK 8-state TCM 62.5Mbps**

(55Mbps)

125Mbps

(110Mbps)

250Mbps

(200Mbps)

DQPSK

(Base Mod.)

None 125Mbps

(110Mbps)

250Mbps

(200Mbps)

500Mbps

(350Mbps)

16-QAM 8-state TCM **Payload Rb

(min PHY-SAP Data Tput)

375Mbps (300Mbps)

750Mbps

(480Mbps)

32-QAM 8-state TCM 500Mbps (350Mbps)

1000Mbps

(600Mbps)

64-QAM 8-state TCM 312.5Mbps (200Mbps)

625Mbps (400Mbps)

1250Mbps

(700Mbps)

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 11

doc.: IEEE 802.15-03/107r0

Submission

Multiple Bit Stream Encoder or Single Bit Stream Encoder?

Sym S/P

ENC

Bit Stream

Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

SubBand #4

Sym S/P

ENC

mulitple-Stream Encoder

Bit Stream

Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

Multiple-Stream Decoder

ENC

Sym Sym Sym ENC

Sym Sym Sym

Sym S/P

ENC

Bit Stream

Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

SubBand #4

Sym S/P

DEC

Bit Stream

Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

ENC

Sym Sym Sym DEC

Sym Sym Sym

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 12

doc.: IEEE 802.15-03/107r0

Submission

Multiple Bit Stream Encoder or Single Bit Stream Encoder?

Sym S/P

ENC

Single-Stream Encoder

Bit Stream Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

SubBand #4

Sym S/P

ENC

Single-Stream Encoder

Bit Stream Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

SubBand #4

Sym P/S

DEC

Single-Stream Decoder

Bit Stream Sym Sym Sym

SubBand #1

SubBand #2

SubBand #3

SubBand #4

• Single bit stream encoder should be chosen as it can better correct uniformly-spaced symbol errors due to ‘poor’ performance in particular sub-band

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 13

doc.: IEEE 802.15-03/107r0

Submission

PHY-SAP Payload Bit Rate & Data Throughput

Packet overhead parameters for data throughput comparison

Preamble PHY Header MPDU MIFS

T_PA_INIT T_PHYHDR

MACHeader

HCS FCS

T_MIFS

MPDU_bits(variable)

Frame n-1 Transmision Frame n Transmission

Preamble PHY Header MPDU

T_PA_CONT T_PHYHDR

MACHeader

HCS FCS SIFS

T_SIFST_MACHDR T_MPDU T_FCST_HCS T_MACHDR T_MPDU T_FCST_HCS

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 14

doc.: IEEE 802.15-03/107r0

Submission

PHY-SAP Payload Bit Rate & Data Throughput for 62.5 MHz PRF

T_PA_INITIAL 8 CAZAC Seq us 2.048 2.048 2.048 2.048 2.048T_SIFS us 8 8 8 8 8T_PA_CONT 8 CAZAC Seq us 2.048 2.048 2.048 2.048 2.048T_MIFS us 2 2 2 2 2T_MACHDR 320 bits us 2.56 2.56 2.56 2.56 2.56T_PHYHDR 16 bits us 0.128 0.128 0.128 0.128 0.128T_HCS 16 bits us 0.128 0.128 0.128 0.128 0.128T_Stuff Bits + T_Tail Syms (max) 15 bits us 0.24 0.12 0.08 0.06 0.048T_MPDU 8160 bits us 130.56 65.28 43.52 32.64 26.112T_FCS 32 bits us 0.512 0.256 0.170667 0.128 0.1024Total Frame period (1st frame) 136.688 71.032 49.14667 38.204 31.6384Total Frame period (subseq. Frame) 136.432 70.776 48.89067 37.948 31.3824Payload_bits MHz 8160 8160 8160 8160 8160R_Pay Mbps 62.5 125 187.5 250 312.5#Frame for cal. Payload_Throughput_PHY_SAP (multi-pkt) 5 5 5 5 5Payload_Throughput_PHY_SAP (single-pkt) Mbps 56.59749 103.9226 144.0814 178.5871 208.5548Payload_Throughput_PHY_SAP (multi-pkt) Mbps 58.54667 110.6891 157.4236 199.55 237.7179Frame efficiency 0.936747 0.885513 0.839593 0.7982 0.760697Code rate 0.5 1 0.75 0.8 0.833333Mod (Bits/Sym) 2 2 4 5 6PRF or Channel Symbol Rate MHz 62.5 62.5 62.5 62.5 62.5Channel Throughput Rc MHz 62.5 125 187.5 250 312.5

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 15

doc.: IEEE 802.15-03/107r0

Submission

PHY-SAP Payload Bit Rate & Data Throughput for 125 MHz PRF

T_PA_INITIAL 8 CAZAC Seq us 1.024 1.024 1.024 1.024 1.024T_SIFS us 8 8 8 8 8T_PA_CONT 8 CAZAC Seq us 1.024 1.024 1.024 1.024 1.024T_MIFS us 2 2 2 2 2T_MACHDR 320 bits us 1.28 1.28 1.28 1.28 1.28T_PHYHDR 16 bits us 0.064 0.064 0.064 0.064 0.064T_HCS 16 bits us 0.064 0.064 0.064 0.064 0.064T_Stuff Bits + T_Tail Syms (max) 15 bits us 0.12 0.06 0.04 0.03 0.024T_MPDU 8160 bits us 65.28 32.64 21.76 16.32 13.056T_FCS 32 bits us 0.256 0.128 0.085333 0.064 0.0512Total Frame period (1st frame) 68.344 35.516 24.57333 19.102 15.8192Total Frame period (subseq. Frame) 68.216 35.388 24.44533 18.974 15.6912Payload_bits MHz 8160 8160 8160 8160 8160R_Pay Mbps 125 250 375 500 625#Frame for cal. Payload_Throughput_PHY_SAP (multi-pkt) 5 5 5 5 5Payload_Throughput_PHY_SAP (single-pkt) Mbps 107.2442 188.6269 252.4961 303.9559 346.3027Payload_Throughput_PHY_SAP (multi-pkt) Mbps 114.4653 212.1685 296.5404 370.1352 434.8938Frame efficiency 0.915722 0.848674 0.790774 0.74027 0.69583Code rate 0.5 1 0.75 0.8 0.833333Mod (Bits/Sym) 2 2 4 5 6PRF or Channel Symbol Rate MHz 125 125 125 125 125Channel Throughput Rc MHz 125 250 375 500 625

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 16

doc.: IEEE 802.15-03/107r0

Submission

PHY-SAP Payload Bit Rate & Data Throughput for 250 MHz PRF

T_PA_INITIAL 8 CAZAC Seq us 0.576 0.576 0.576 0.576 0.576T_SIFS us 8 8 8 8 8T_PA_CONT 8 CAZAC Seq us 0.576 0.576 0.576 0.576 0.576T_MIFS us 2 2 2 2 2T_MACHDR 320 bits us 0.64 0.64 0.64 0.64 0.64T_PHYHDR 16 bits us 0.032 0.032 0.032 0.032 0.032T_HCS 16 bits us 0.032 0.032 0.032 0.032 0.032T_Stuff Bits + T_Tail Syms (max) 15 bits us 0.06 0.03 0.02 0.015 0.012T_MPDU 8160 bits us 32.64 16.32 10.88 8.16 6.528T_FCS 32 bits us 0.128 0.064 0.042667 0.032 0.0256Total Frame period (1st frame) 34.236 17.822 12.35067 9.615 7.9736Total Frame period (subseq. Frame) 34.172 17.758 12.28667 9.551 7.9096Payload_bits MHz 8160 8160 8160 8160 8160R_Pay Mbps 250 500 750 1000 1250#Frame for cal. Payload_Throughput_PHY_SAP (multi-pkt) 5 5 5 5 5Payload_Throughput_PHY_SAP (single-pkt) Mbps 193.7874 317.5839 403.5076 466.6324 514.9695Payload_Throughput_PHY_SAP (multi-pkt) Mbps 218.7198 390.5427 529.0914 643.1781 738.7557Frame efficiency 0.874879 0.781085 0.705455 0.643178 0.591005Code rate 0.5 1 0.75 0.8 0.833333Mod (Bits/Sym) 2 2 4 5 6PRF or Channel Symbol Rate MHz 250 250 250 250 250Channel Throughput Rc MHz 250 500 750 1000 1250

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 17

doc.: IEEE 802.15-03/107r0

Submission

System Performance

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 18

doc.: IEEE 802.15-03/107r0

Submission

Sub-band Receiver

• Each device should have same number of parallel subband receivers as number of sub-bands employed

• Each sub-band receiver oversamples at 500MHz and combines the oversamples with RAKE or channel equalisers

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 19

doc.: IEEE 802.15-03/107r0

Submission

Eb/No in AWGN & UWB Channel in OverSampling RAKE Receiver

Modulation Type

Coding Eb/No for PER ~ 8% in AWGN

(1024-octet packet)

Eb/No for PER ~ 8% in OverSamp UWB Channels using 8 sub-band (1024-octet packet)

QPSK 8-state TCM 6 dB ~9 dB + (Energy loss in corr CMs)

QPSK

(Base Mod.)

None 10 dB ~13 dB + (Energy loss in corr CMs)

16-QAM 8-state TCM 9 dB ~12 dB + (Energy loss in corr CMs)

32-QAM 8-state TCM 11 dB ~14 dB + (Energy loss in corr CMs)

64-QAM 8-state TCM 13 dB ~16 dB + (Energy loss in corr CMs)

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 20

doc.: IEEE 802.15-03/107r0

Submission

Channel Energy Loss in diff. CMs• Due to staggered frequency-time transmission,

energy outside receive timing window (of duration equals to 1/PRF) of the current sub-band is lost

Channel Energy Loss (dB)

PRF

31.25MHz 62.5 MHz 125MHz 250MHz

CM4 5

2.8 (1.3)

6

4.5 (1.5)

8

6.0 (1.7)

Norminal value

Mean (std-dev)

CM3 4

2.1 (1.4)

5

3.2 (1.5)

6

4.5 (1.6)

8

5.2 (1.7)

CM2 3

1.6 (1.1)

4

2.1 (1.1)

5

3.4 (1.2)

6

4.8 (1.6)

CM1 2.5

1.5 (1.1)

3

1.6 (1.1)

4

2.2 (1.2)

5

3.2 (1.3)

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 21

doc.: IEEE 802.15-03/107r0

Submission

RF Receiver Noise Figure

-90°

I

Q

LNA

BPF Quad. Mixer LPF

LPF

LO

Antenna

VGA

Gain Control

BPF LNA and VGA Quad. Mixer LPF

Gain (dB) -2 20 7 -2

N.F. (dB) 2 3.5 7 2

Cascaded (dB)

2 5.5 5.58 5.58

With fast switching PLL

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 22

doc.: IEEE 802.15-03/107r0

Submission

Link Budget for 62.5 MHz PRFChannel Condition & Basic Mod. CM4-B CM4 CM3-B CM3 CM2-B CM2Throughput MHz 110 55 110 110 110 200F low GHz 3.1 3.1 3.1 3.1 3.1 3.1F high GHz 3.6 3.6 3.6 3.6 3.6 3.6Range m 15 15 10 10 4 4Transmit ant gain dBi 0 0 0 0 0 0Receive ant gain dBi 0 0 0 0 0 0

NF ref to Ant Terminal dB 6 6 6 6 6 6

Bandwidth GHz 0.5 0.5 0.5 0.5 0.5 0.5Ave transmit pwr dBm -14.3 -14.3 -14.3 -14.3 -14.3 -14.3

Geo centre freq GHz 3.3 3.3 3.3 3.3 3.3 3.3Path loss @1m dB 42.9 42.9 42.9 42.9 42.9 42.9Path loss @ range dB 23.5 23.5 20.0 20.0 12.0 12.0Receive power dBm -80.7 -80.7 -77.2 -77.2 -69.2 -69.2Ave noise pwr /bit dBm -102.1 -105.1 -102.1 -102.1 -102.1 -98.1Ave noise pwr (Pn) dBm -96.1 -99.1 -96.1 -96.1 -96.1 -92.1

Eb/No in multipath channels dB 19.0 15.0 18.0 18.0 17.0 19.0Implementation loss dB 3 3 3 3 3 3link margin -6.6 0.4 -2.1 -2.1 6.8 0.9available Eb/No dB

Eb/No in AWGN dBm 10.0 6.0 10.0 10.0 10.0 13.0Rx Sensitivity level dBm -83.1 -90.1 -83.1 -83.1 -83.1 -76.1

link margin in AWGN dB 2.4 9.4 5.9 5.9 13.8 6.9

Channel Throughput Rc Mbps 125 62.5 125 125 125 312.5Code rate 1 0.5 1 1 1 0.833333Mod (Bits/Sym) 2 2 2 2 2 6PRF MHz 62.5 62.5 62.5 62.5 62.5 62.5Sampling rate MHz 500 500 500 500 500 500

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 23

doc.: IEEE 802.15-03/107r0

Submission

Link Budget for 125MHz PRFChannel Condition & Basic Mod. CM3-B CM3 CM2-B CM2 CM2 CM2 CM2Throughput MHz 200 110 200 200 300 350 400F low GHz 3.1 3.1 3.1 3.1 3.1 3.1 3.1F high GHz 3.6 3.6 3.6 3.6 3.6 3.6 3.6Range m 10 10 4 4 4 3 2Transmit ant gain dBi 0 0 0 0 0 0 0Receive ant gain dBi 0 0 0 0 0 0 0

NF ref to Ant Terminal dB 6 6 6 6 6 6 6

Bandwidth GHz 0.5 0.5 0.5 0.5 0.5 0.5 0.5Ave transmit pwr dBm -14.3 -14.3 -14.3 -14.3 -14.3 -14.3 -14.3

Geo centre freq GHz 3.3 3.3 3.3 3.3 3.3 3.3 3.3Path loss @1m dB 42.9 42.9 42.9 42.9 42.9 42.9 42.9Path loss @ range dB 20.0 20.0 12.0 12.0 12.0 9.5 6.0Receive power dBm -77.2 -77.2 -69.2 -69.2 -69.2 -66.7 -63.2Ave noise pwr /bit dBm -99.1 -102.1 -99.1 -99.1 -97.3 -96.0 -95.1Ave noise pwr (Pn) dBm -93.1 -96.1 -93.1 -93.1 -91.3 -90.0 -89.1

Eb/No in multipath channels dB 19.0 15.0 18.0 18.0 17.0 19.0 21.0Implementation loss dB 3 3 3 3 3 3 3link margin -6.1 0.9 2.8 2.8 2.1 1.3 1.9available Eb/No dB

Eb/No in AWGN dBm 10.0 6.0 10.0 10.0 9.0 11.0 13.0Rx Sensitivity level dBm -80.1 -87.1 -80.1 -80.1 -79.3 -76.0 -73.1

link margin in AWGN dB 2.9 9.9 10.8 10.8 10.1 9.3 9.9

Channel Throughput Rc Mbps 250 125 250 250 375 500 625Code rate 1 0.5 1 1 0.75 0.8 0.833333Mod (Bits/Sym) 2 2 2 2 4 5 6PRF MHz 125 125 125 125 125 125 125Sampling rate MHz 500 500 500 500 500 500 500

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 24

doc.: IEEE 802.15-03/107r0

Submission

Link Budget for 250 MHz PRFChannel Condition & Basic Mod. CM2-B CM2 CM2 CM2 CM2Throughput MHz 350 200 480 600 700F low GHz 3.1 3.1 3.1 3.1 3.1F high GHz 3.6 3.6 3.6 3.6 3.6Range m 4 4 3 2 1.5Transmit ant gain dBi 0 0 0 0 0Receive ant gain dBi 0 0 0 0 0

NF ref to Ant Terminal dB 6 6 6 6 6

Bandwidth GHz 0.5 0.5 0.5 0.5 0.5Ave transmit pwr dBm -14.3 -14.3 -14.3 -14.3 -14.3

Geo centre freq GHz 3.3 3.3 3.3 3.3 3.3Path loss @1m dB 42.9 42.9 42.9 42.9 42.9Path loss @ range dB 12.0 12.0 9.5 6.0 3.5Receive power dBm -69.2 -69.2 -66.7 -63.2 -60.7Ave noise pwr /bit dBm -96.0 -99.1 -94.3 -93.0 -92.1Ave noise pwr (Pn) dBm -90.0 -93.1 -88.3 -87.0 -86.1

Eb/No in multipath channels dB 19.0 15.0 17.0 19.0 21.0Implementation loss dB 3 3 3 3 3link margin -1.2 5.8 1.6 1.8 1.4available Eb/No dB

Eb/No in AWGN dBm 10.0 6.0 9.0 11.0 13.0Rx Sensitivity level dBm -77.0 -84.1 -76.3 -73.0 -70.1

link margin in AWGN dB 7.8 14.8 9.6 9.8 9.4

Channel Throughput Rc Mbps 500 250 750 1000 1250Code rate 1 0.5 0.75 0.8 0.833333Mod (Bits/Sym) 2 2 4 5 6PRF MHz 250 250 250 250 250Sampling rate MHz 500 500 500 500 500

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 25

doc.: IEEE 802.15-03/107r0

Submission

PRF and simultaneously operating piconets

• 1/PRF * (total #sub-bands per piconet) should be more than Channel delay spread so that a simple RAKE (vector RAKE) can be used

• Normally, when a another piconet get associated, operating PRF is reduced too (Data throughput is reduced alongside) to maintain PER performance

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 26

doc.: IEEE 802.15-03/107r0

Submission

RAKE or Channel Equaliser?

• Adaptive Equaliser, on the other hand, can be employed to equalise ISI in the event of simultaneously operating piconets, when the total sub-band per piconet reduces.

• This will generally result in maintaining the data throughput, as Eb/No is maintained

• This implies, when a another piconet get associated, operating PRF can be retained (Data throughput remains alongside), while PER performance is maintained

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 27

doc.: IEEE 802.15-03/107r0

Submission

Merits of Proposed Modulation and Coding Schemes for Alt-PHY

• 802.15.3 Modulation and coding schemes are– Of low complexity– Well proven and mature technology– Free of proprietary or patented IP

March 2003

Francois Chin, Madhukumar, Xiaoming Peng, Sivanand, I2RSlide 28

doc.: IEEE 802.15-03/107r0

Submission

Merits of Proposed Alt-PHY REF LEVEL CRITERIA3.1 B Unit Manufacturing Complexity (UMC)

3.2.2 A Interference And Susceptibility3.2.3 A Coexistence3.3.1 A Manufacturability3.3.2 A Time To Market3.3.3 A Regulatory Impact3.4 A Scalability 3.5 C Location Awareness5.1 B Size And Form Factor

5.2.1 A Payload Bit Rate5.2.2 A Packet Overhead5.2.3 A PHY-SAP Throughput5.3 A Simultaneously Operating Piconets5.4 A Signal Acquisition5.5 A System Performance5.6 A Link Budget5.7 A Sensitivity5.8 B Power Management Modes5.9 A Power Consumption

5.10 B Antenna Practicality4.1 C MAC Enhancements And Modifications