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May,2003 IEEE P802.15-03/120r0

IEEE P802.15Wireless Personal Area Networks

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

Title <title>

Date Submitted

[3 March, 2003]

Source [Reed Fisher][Oki Electric Industry Co., Ltd.][2514 E. Maddox Rd., Buford, GA 30519 USA.]

[Hiroyo Ogawa] [Communication Research Laboratory Independent Administrative Institution][3-4 Hikarino-oka, Yokosuka, Kana-gawa, 239-09847 Japan.]

Voice: [1-770-271-0529] E-mail: [[email protected] ]

Voice:[81-46-847-5070]FAX[81-46-847-5079]E-Mail:[[email protected],jp]

Re: [CFP presentation]

Abstract [Millmeter-wave ad-hoc wireless system for the alternate PHY to IEEE802.15.3 MAC&PHY Standard for Alt PHY]

Purpose [Proposal for the alternate PHY to IEEE802.15.3 MAC&PHY Standard]

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.

Submission Reed Fisher , Oki

May,2003 IEEE P802.15-03/120r0

Millimeter-Wave Ad-hoc Wireless System

1. System Features Utilization of unlicensed millimeter-wave band

- Restricted small area but high speed data rate (125Mbps)- High coexistence with the existing microwave band wireless system

Countermeasure in use of millimeter-wave bandComplete cancellation of phase noise and frequency-offset by self-heterodyne transmi-ssion and detection technique

2. Application Images Basic Ad-hoc system based on 802.15.3a applications

PNC organizes the communications among DEVs in the piconet .

Figure 1. Basic Ad-hoc system

Ad-hoc information distribution systemThe ad-hoc coverage area extension using P-P millimeter-wave link


PNC

DEVDEV

DEV PNC

DEVDEV

DEV

May,2003 IEEE P802.15-03/120r0

Figure 2. Ad-hoc information distribution system

3. Base Band (BB) & IF processing Basic transmission rate is 125Mbps using DQPSK Configuration Schemes

1) Single channel structure using one modulator-Simple structure using a high speed modulator (125Mbps)

2) Multi-channel structure using 5 modulators-Frequency division multiplex using low speed modulators (25Mbps)-Number of channels is 5-Transmission rate per channel is 25Mbps

(Total transmission rate is 125Mbps)-Simultaneous transmission of divided frame

In the following parts of this document, the system means the multi-channel structure type unless there is particular explanation.

Figure 3. Block diagram of Base band and IF processing


1) Single channel structure

2) Multi-channel structure

Inputdata

Packetdistribute

MACcontrol

Tx

BB & IF processingBB IF

f1

Channelcode/decode

Modulator/Demodulator

BPF CRx

RF

125Mbps

Inputdata

Packetdistribute

MACcontrol

Tx


f1

Channelcode/decode


BPF CRx

RF

125Mbps

f1

25 MHz

f2 f3 f4 f5f1

25 MHz

f2 f3 f4 f5f1

25 MHz

f2 f3 f4 f5Inputdata

Packetdistribute

MACcontrol

RF

ΣΣ

ΣΣ

Tx

Rx


Channel #1 f1

Channelcode/decode


BPF

Channel #2 f2

Channelcode/decode


BPF

Channel #5 f5

Channelcode/decode


BPF

C

C

C

25Mbps

25Mbps

25Mbps

Frequency allocation of IF band

May,2003 IEEE P802.15-03/120r0

4. RF processing Transmission

Wireless transmission of both the signal and the coherent local carrier using DSB Reception

Complete cancellation of phase-noise and frequency -offset by the self -heterodyne detection (square-law detection)

Figure 4. Block diagram of RF processing


IFinput

IFoutput

fc fc+fifc-fi

B B

NF=F

2BReceiverTransmitter

Local leakDSB mixer

fc

Pt Pr

ffiB

B

Tfi

IM2

( )2

May,2003 IEEE P802.15-03/120r0

5. PHY Frame Format5.1. Single Channel Structure

Figure 5. PHY frame format: Single Channel Structure5.2. Multi-channel Structure


Preamble

MAC Header

80 bits

PHY Header

MAC Header

HCS

Payload+FCS

250 bits

16 bits

10 Bytes (80 bits)

16 bits

1024+4=1028 Bytes (8224 bits)

PHY Header, Mac Header, HCS,Pad

(Payload+FCS),Pad,ch. coding

DQPSK (25Mbps)

112 bits

9827 bits

Add PHY header, Calculate HCS

Unique word

130 bits

After channel coding (BCH(31,26))Add PreambleAdd Unique word

PHY Header, Mac Header, HCS,Pad,channel coding

20 bits 155 bits

From MAC via PHY SAP

(Payload+FCS)

8224 bits

8242 bits

(Payload+FCS),PadAdd Pad

Error Correction filed (BCH(31,26))

FCS : Frame Check Sequence HCS : Header Check Sequence Pad : Padding

Preamble

MAC Header

80 bits

PHY Header

MAC Header

HCS

Payload+FCS

250 bits

16 bits

10 Bytes (80 bits)

16 bits

1024+4=1028 Bytes (8224 bits)



DQPSK (25Mbps)

112 bits

1984 bits


Unique word

130 bits



20 bits 155 bits


(Payload+FCS)After dividing (payload+FCS) to 5 chMAC Header

80 bits 1645 bits

(Payload+FCS)

1645 bits

1664 bits




May,2003 IEEE P802.15-03/120r0

Figure 6. PHY frame format: Multi-channel Structure

6. Interference and SusceptibilityInterference coming from the other standard systems is negligibly small.

The interference attenuation by spurious strength and filter is expected between Millimeter-wave band (802.15.3a) and Micro-wave band (other standard systems).

-Calculation for interference from other standard system

Table 1. Interference coming from the other standard systems


42 dB55 dB55 dBRx filter attenuation of proposal system

-103.5 dBm-114.6 dBm-131.6 dBmInterference to the proposed system

36.5 dB29.6 dB29.6 dBPath loss at 0.3 meter

40 dB50 dB47 dBSpurious strength attenuation

0 dBi0 dBi0 dBiTx antenna gain (GT)

15 dBm20 dBm0 dBmTx power

2.4 GHz

IEEE 802.11bIEEE 802.15.3

Center frequency 5.4 GHz2.4 GHz

IEEE 802.11aBluetoothIEEE 802.15.1

42 dB55 dB55 dBRx filter attenuation of proposal system

-103.5 dBm-114.6 dBm-131.6 dBmInterference to the proposed system

36.5 dB29.6 dB29.6 dBPath loss at 0.3 meter

40 dB50 dB47 dBSpurious strength attenuation

0 dBi0 dBi0 dBiTx antenna gain (GT)

15 dBm20 dBm0 dBmTx power

2.4 GHz

IEEE 802.11bIEEE 802.15.3

Center frequency 5.4 GHz2.4 GHz

IEEE 802.11aBluetoothIEEE 802.15.1

（Rx filter attenuation is calculated by using N-degree Butterworth filter）

May,2003 IEEE P802.15-03/120r0

7. CoexistenceThe interference impacted to microwave band systems, from this proposed systems, is

sufficiently smaller than the Rx sensitivity of the microwave system.

Therefore, coexistence is assured.

-Calculation of interference impacted to other standard system from this proposal system

Table 2. Interference impacted to the other standard systems


55.75 dBPath loss at 0.3 meter

50 dBSpurious strength loss

-82 dBm-76 dBm-75 dBm-70 dBmRx Sensitivity

0 dBi0 dBi0 dBi0 dBi0 dBiRx Antenna Gain (GR)

0 dBi0 dBi0 dBi0 dBi0 dBiTx Antenna Gain (GT)

15 dBm20 dBm0 dBm0 dBm10 dBmTx Power

2.4 GHz

IEEE802.11b

5.3 GHz2.4 GHz2.4 GHz60 GHzCenter frequency

-95.75 dBmInterference impacted to othersystem from 802.15.3a

IEEE802.11a

IEEE802.15.3

IEEE802.15.1

IEEE802.15.3a

May,2003 IEEE P802.15-03/120r0

8. Payload Bit Rate and Data Throughput

Figure 7. Time length of PHY frame

Therefore, the Data Throughputs for Payload Bit Rates are given as following table.

Table 3. Data Throughput for each payload bit rate


77Mbps (61.6%) 82Mbps (65.6%)

Payload bit RateData Throughput

125Mbps DQPSK

ModulationSingle Frame Multi frame

Throughput = 5channels× Throughput per channel

N× Frame Length＋SIFS＋（N-1）× MIFSN× Payload＿bitsThroughput

per channel=

Where, Payload_bit=1024/5byte, N =1(single), 5(multi)，SIFS=10μ sec, MIFS=2μ sec Frame Length= 409μ sec(DQPSK)

(1) Single FramePreamble SD PHY-HDR MAC-HDR HCS Payload FCS SIFS

17μ sec 79.4μ sec(DQPSK) 10μ sec

96.4μ sec

(2) Multi frame Preamble SD PHY-HDRMAC-HDR HCS Payload FCS MIFS Preamble SD PHY-HDR MAC-HDR HCS Payload FCS MIFS Payload FCS SIFS

2μ sec 10μ sec

May,2003 IEEE P802.15-03/120r0

9. Simultaneously Operating Piconets - Co-channel separation distance (dint) is about 7.94 m, from the following calculation.- Each parameter is referred to link budget.- Calculation is as follows.- Tx antenna gain = Rx antenna gain = 8 dBi

Figure 8. Co-channel interference level


Proposal Min. Rx level:-66.3 dBm

ReferenceTransmitter

TestReceiver

-60.3 dBm

InterferenceTransmitters

Tx power :10 dBm

Tx antenna gain : 8 dBi

Path loss at 1 meter: 68 dB

-55 dBm

dint

-73 dBmPath loss at dint meter= 18 dB SNR

12.7 dB

MS

Piconet1Piconet2

MSMSDesired

signal : SInterference

signal : I

System loss : 13 dB

-73 dBm

At Tx antenna gain= Rx antenna gain= 8 dBi

( dint meter= 7.94 m)

-50 dBm

-42 dBm

Rx antenna gain : 8 dBi

Figure 9. PER vs. Eb/No Characteristics

May,2003 IEEE P802.15-03/120r0

10. Signal Acquisition 10.1 Miss detect probability of AWGN channel

Miss detect probability (Pmd) is probability which causes bit error more than 2 bits and 1 bit error is permitted to detect unique word.

From the following calcuation, the required Eb/No is obtained

Eb/N0 = 6.7 dB at Pmd=8 x 10-2

-Calculation of Pmd is as follows BER (Bit Error Rate) = 1/2 erfc{ 2(Eb/N0)1/2 sin(/8) } Pmd_1ch = 1 - {(1 - BER)x + (1 - BER)(x-1) * BER * x} where x = unique word length (=20) for 1 channel

Pmd = 1 - (1 - Pmd_1th ch) (1 - Pmd_2nd ch) (1 - Pmd_3rd ch) (1 - Pmd_4th ch) (1 - Pmd_5th ch) It is assumed that Pmd_1th ch = Pmd_2nd ch = Pmd_3rd ch= Pmd_4th ch = Pmd_5th ch

Pmd = 1 - (1 - Pmd_1 ch)5


1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

0 2 4 6 8 10 12 14 16Eb/N0 (dB)

Pmd

UW detection error

May,2003 IEEE P802.15-03/120r0

10.2 False alarm probability of AWGN channelFalse alarm probability (Pfa) is probability which detects unique ward after PHY Header.Pfa = 1.02 x 10-2

- Calculation of Pfa is as follows Pfa_1ch = 0.520 x 2139= 2.04 x 10-3

20 = unique word length2139 = (length from PHY Header to FCS with including FEC per 1ch)

Pfa = 1 - (1 - Pfa_1th ch) (1 - Pfa_2nd ch) (1 - Pfa_3rd ch) (1 - Pfa_4th ch) (1 - Pfa_5th ch)It is assumed that Pfa_1th ch = Pfa_2nd ch = Pfa_3rd ch= Pfa_4th ch = Pfa_5th ch

Pfa=1 - (1 - Pfa_1ch)5 = 1 –(1 – 2.04 x 10-3)5 = 1.02 x 10-2

( “5” means Number of channel)


May,2003 IEEE P802.15-03/120r0

11. System Performance11.1 Required Eb/N0 for PER 8 % in AWGN channel

Figure 10. PER vs. Eb/No Characteristics for 125Mbps(DQPSK)


1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

0 2 4 6 8 10 12 14 16Eb/N0 (dB)

PER

SystemPerformance

- Required Eb/N0

9.7dB (125Mbps, DQPSK)

- Calculation of Psys is as follows

BER1 = 1/2 erfc{ 2(Eb/N0)1/2 sin(/8) } for DQPSK

BER 2= 45BER12 (BER2 is Bit Error Rate after BCH(31,26))

P1 = miss detection error (Pmd 1ch)

P2 = probability which causes error from PHY Header to HCS (Length = m bit) = 1 – (1 – BER2)m

P3 = probability which causes error from Payload to FCS (Length = n bit) = 1 – (1 – BER2)n

PER (Psys1ch) for 1 channel is as follows

Psys1ch = P1 + P2 + P3= P1 + (1 – P1)*P2 + [1 – {P1 + (1 – P1)*P2}]*P3

Psys = 1 - (1 - Psys_1th ch) (1 - Psys_2nd ch) (1 - Psys_3rd ch) (1 - Psys_4th ch) (1 - Psys_5th ch)

It is assumed that Psys_1th ch = Psys_2nd ch = Psys_3rd ch= Psys_4th ch = Psys_5th ch

Psys = 1 - (1 - Psys_1 ch)5

May,2003 IEEE P802.15-03/120r0

11.2 PER vs. Distance characteristics of AWGN channel

Figure 11. PER vs. Distance Characteristics for 125Mbps(DQPSK)


1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

0 5 10 15 20 25Distance (m)

PER

SystemPerformance

- By using PER-Eb/N0 characteristics, PER-Distance characteristics are calculated.- Parameters such as center frequency, propagation loss are referred to link budget.- PER at d = 10 m is less than 10-5

May,2003 IEEE P802.15-03/120r0

12. Sensitivity Receiver Sensitivity of this system is given by following equation.

Receiver Sensitivity= Noise Power+Required Eb/No +Modulation Loss +Self-heterodyne Loss+Channel Multiplex Loss

Table 4. Receiver sensitivity for each transmission rate


TermBit Rate

Noise Power -174dBHz+10log10(25MHz)+8dB(NF)-92dBm

125Mbps(DQPSK) Note

Required Eb/No 9.7dB

6dBSelf- heterodyne Loss

7dBChannel Multiplex Loss

Receiver Sensitivity -66.3dBm

10log10(5)10log10 (4)

Modulation Loss 3dB

PER <8%

May,2003 IEEE P802.15-03/120r0

13. Link Budget- Link budget is calculated for antenna gain 0 dBi case and 8 dBi case.- Link margin is as follows.

Link margin = -12 dB (antenna gain 0 dBi)Link margin = 4 dB (antenna gain 8 dBi)

- From link budget, directional antenna is necessary for millimeter-wave band system.

Table 5. Link budget


ParameterThroughputAverage Tx power (Pt) 10 dBm 10 dBmTx antenna gain (Gt) 0 dBi 8 dBiCenter frequency（ｆ） 60 GHz 60 GHzPath loss at 1meter (L1)(L1 = 20log10(4π f'c/c)) c=3x10̂ 8 68 dB 68 dB

distance d (m) 10 m 10 mPath loss at d m(L2)(L2 = 20log10(d)) 20 dB 20 dB

Rx antenna gain (Gr) 0 dBi 8 dBiRx power (Pr=Pt+Gt+Gr-L1-L2) -78 dBm -62 dBmBand width (Rb) per channel 25 MHz 25 MHz

Average noise power per bit(N)(N = -174 + 10*log10(Rb) -100 dBm -100 dBm

Rx Noise Figure Refferd totha Antenna Terminal (NF) 8 dB 8 dB

Average noise power per bit (Pn=N+NF) -92 dBm -92 dBm

Minimum Eb/ N0 (S) 9.7 dB 9.7 dBImplementation Loss (I) 16 dB 16 dBLink Margin (M=Pr-Pn-S- I) -12 dB 4 dBProposed Min. Rx Sensitivity Level -66.3 dBm -66.3 dBm

125 MbpsValue

May,2003 IEEE P802.15-03/120r0

14. Regulatory Compliance

Table 6. Regulatory Compliance

15. Scalability-125 Mbps data rate is supported by multi-channel (25 Mbps×5 channel).-At 125 Mbps, DQPSK modulation/demodulation is used.-When the desired rate is less than 125 Mbps, it is provided by decreasing the number of

active RF channels.-When the desired rate is greater than 125 Mbps, it could be provided by changing modulation

method(see appendix).


Geographical Region

Japan Radio Regulatory Law Article 4.3Enforcement Regulatory Article 6.4

10dBm

TransmissionPower Limit

59GHz-66GHz

Frequency band Regulatory

USA 10dBm 57GHz-64GHz 47 CFR 15.255

May,2003 IEEE P802.15-03/120r0

SELF-Evaluation

General Solution Criteria

CRITERIA REF. IMPORTANCELEVEL PROPOSER RESPONSE

Unit Manufacturing Complexity (UMC)

3.1 B 0

Signal RobustnessInterference And Susceptibility

3.2.2 A +

Coexistence 3.2.3 A +

Technical Feasibility

Manufacturability 3.3.1 A +

Time To Market 3.3.2 A 0

Regulatory Impact 3.3.3 A +

Scalability (i.e. Payload Bit Rate/Data Throughput, Channelization – physical or coded, Complexity, Range, Frequencies of Operation, Bandwidth of Operation, Power Consumption)

3.4 A 0

Location Awareness 3.5 C -


May,2003 IEEE P802.15-03/120r0

PHY Protocol Criteria

CRITERIA REF. IMPORTANCE LEVEL PROPOSER RESPONSE

Size And Form Factor 5.1 B 0

PHY-SAP Payload Bit Rate & Data ThroughputPayload Bit Rate 5.2.1 A +

Packet Overhead 5.2.2 A +

PHY-SAP Throughput 5.2.3 A +

Simultaneously Operating Piconets

5.3 A 0

Signal Acquisition 5.4 A 0

System Performance 5.5 A +

Link Budget 5.6 A +

Sensitivity 5.7 A 0

Power Management Modes 5.8 B 0

Power Consumption 5.9 A 0

Antenna Practicality 5.10 B 0

MAC Protocol Enhancement Criteria

CRITERIA REF. IMPORTANCE LEVEL PROPOSER RESPONSE

MAC Enhancements And Modifications

4.1. C 0


May,2003 IEEE P802.15-03/120r0

Appendix. Optional proposal for 250 MbpsA.1. PHY Frame FormatA.1.1. Single Channel Structure

Figure 12. PHY frame format: 1 channelA.1.2. Multi-channel Structure


Preamble

MAC Header

80 bits

PHY Header

MAC Header

HCS

Payload+FCS

250 bits

16 bits

10 Bytes (80 bits)

16 bits

1024+4=1028 Bytes (8224 bits)



DQPSK (25Mbps)

112 bits

9827 bits


Unique word

130 bits



20 bits 155 bits


(Payload+FCS)

8224 bits

8242 bits




16QAM (50Mbps)

May,2003 IEEE P802.15-03/120r0

Figure 13. PHY frame format: 5 channels

A.2. Payload Bit Rate and Data Throughput


Preamble

MAC Header

80 bits

PHY Header

MAC Header

HCS

Payload+FCS

250 bits

16 bits

10 Bytes (80 bits)

16 bits

1024+4=1028 Bytes(8224 bits)



DQPSK (25Mbps) 16QAM (50Mbps)

112 bits

1984 bits


Unique word

130 bits



20 bits 155 bits


(Payload+FCS)After dividing (payload+FCS) to 5 chMAC Header

10 Bytes (80 bits) 1645 bits

(Payload+FCS)

1645 bits

1664 bits



FCS:Frame Check Sequence HCS:Header Check Sequence Pad : Padding

May,2003 IEEE P802.15-03/120r0

Figure 14. Time length of PHY frame

Therefore, the Data Throughputs for Payload Bit Rates are given as following table.

Table 7. Data Throughput for each payload bit rate


122.9Mbps (49.2%)

135.9Mbps (54.4%)


250Mbps 16QAM

ModulationSingle Frame Multiframe

122.9Mbps(49.2%)

135.9Mbps(54.4%)


250Mbps 16QAM

Modulation

Throughput = 5channels× Throughput per channel

N× Frame Length＋SIFS＋（N-1）× MIFSN× Payload＿bitsThroughput

per channel=

Where, Payload_bit=1024/5byte, N =1(single), 5(multi)，SIFS=10μ sec, MIFS=2μ sec Frame Length=213μ sec(16QAM)

(1) Single FramePreamble SD PHY-HDR MAC-HDR HCS Payload FCS SIFS

17μ sec 39.7μ sec(16QAM) 10μ sec

56.7μ sec

(2) Multi frame Preamble SD PHY-HDRMAC-HDR HCS Payload FCS MIFS Preamble SD PHY-HDR MAC-HDR HCS Payload FCS MIFS Payload FCS SIFS

2μ sec 10μ sec

Single Frame Multiframe

May,2003 IEEE P802.15-03/120r0

A.3. Simultaneously Operating Piconets - Co-channel separation distance (dint) is about 7.94 m, from the following calculation.- Each parameter is referred to link budget.- Calculation is as follows.- Tx antenna gain = Rx antenna gain = 8 dBi

Figure 15. Co-channel interference level


Proposal Min. Rx level:-61.8 dBm

ReferenceTransmitter

TestReceiver

-55.8 dBm

InterferenceTransmitters

Tx power :10 dBm

Tx antenna gain : 8 dBi

Path loss at 1 meter: 68 dB

-55 dBm

dint

-73 dBmPath loss at dint meter= 18 dB SNR

17.2 dB

MS

Piconet1Piconet2

MSMSDesired

signal : SInterference

signal : I

System loss : 13 dB

-73 dBm

At Tx antenna gain= Rx antenna gain= 8 dBi

( dint meter= 7.94 m)

-50 dBm

-42 dBm

Rx antenna gain : 8 dBi

May,2003 IEEE P802.15-03/120r0

A.4. System PerformanceA.4.1. Required Eb/N0 for PER 8 % in AWGN channel

Figure 16. PER vs. Eb/No Characteristics for 250Mbps(16QAM)


- Required Eb/N0

11.2dB (250Mbps/16QAM)

- Calculation of Psys is as follows

BER1 = 1/2 erfc{ 2(Eb/N0)1/2 sin(/8) } for DQPSK from (Preamble to HCS)

BER 1= (3/8) erfc((CNR/10)1/2) for 16QAM for (Payload+FCS)

BER 2= 45BER12 (BER2 is Bit Error Rate after BCH(31,26))

P1 = miss detection error (Pmd 1ch)

P2 = probability which causes error from PHY Header to HCS (Length = m bit) = 1 – (1 – BER2)m

P3 = probability which causes error from Payload to FCS (Length = n bit) = 1 – (1 – BER2)n

PER (Psys1ch) for 1 channel is as follows

Psys1ch = P1 + P2 + P3= P1 + (1 – P1)*P2 + [1 – {P1 + (1 – P1)*P2}]*P3

Psys = 1 - (1 - Psys_1th ch) (1 - Psys_2nd ch) (1 - Psys_3rd ch) (1 - Psys_4th ch) (1 - Psys_5th ch)

It is assumed that Psys_1th ch = Psys_2nd ch = Psys_3rd ch= Psys_4th ch = Psys_5th ch

Psys = 1 - (1 - Psys_1 ch)5

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

0 2 4 6 8 10 12 14 16Eb/N0 (dB)

PER

Systemperformance

May,2003 IEEE P802.15-03/120r0

A.4.2. PER vs. Distance characteristics of AWGN channel

Figure 17. PER vs. Distance Characteristics for 250Mbps(16QAM)


- By using PER-Eb/N0 characteristics, PER-Distance characteristics are calculated.- Parameters such as center frequency, propagation loss are referred to link budget.- PER at d = 4 m is less than 10-4.

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

0 5 10 15 20Distance (m)

PER

Systemperformance

May,2003 IEEE P802.15-03/120r0

A.5. SensitivityReceiver Sensitivity of this system is given by following equation.

Receiver Sensitivity= Noise Power + Required Eb/No + Modulation Loss + Self-heterodyne Loss + Channel Multiplex Loss

Table 8. Receiver sensitivity for each transmission rate


TermBit Rate

Noise Power -174dBHz+10log10(25MHz)+8dB(NF)-92dBm

250Mbps(16QAM) Note

Required Eb/No 11.2dB

6dBSelf- heterodyne Loss

7dBChannel Multiplex Loss

Receiver Sensitivity -61.8dBm

10log10(5)10log10 (4)

Modulation Loss 6dB

PER <8%

May,2003 IEEE P802.15-03/120r0

A.6. Link Budget

Table 9. Link budget


ParameterThroughputAverage Tx power (Pt) 10 dBm 10 dBmTx antenna gain (Gt) 0 dBi 8 dBiCenter frequency（ｆ） 60 GHz 60 GHzPath loss at 1meter (L1)(L1 = 20log10(4π f'c/c)) c=3x10̂ 8 68 dB 68 dB

distance d (m) 4 m 4 mPath loss at d m(L2)(L2 = 20log10(d)) 12 dB 12 dB

Rx antenna gain (Gr) 0 dBi 8 dBiRx power (Pr=Pt+Gt+Gr-L1-L2) -70 dBm -54 dBmBand width (Rb) per channel 25 MHz 25 MHz

Average noise power per bit(N)(N = -174 + 10*log10(Rb) -100 dBm -100 dBm

Rx Noise Figure Refferd totha Antenna Terminal (NF) 8 dB 8 dB

Average noise power per bit (Pn=N+NF) -92 dBm -92 dBm

Minimum Eb/ N0 (S) 11.2 dB 11.2 dBImplementation Loss (I) 19 dB 19 dBLink Margin (M=Pr-Pn-S- I) -8 dB 8 dBProposed Min. Rx Sensitivity Level -61.8 dBm -61.8 dBm

250 MbpsValue

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