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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
BB & IF processingBB IF
f1
Channelcode/decode
Modulator/Demodulator
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
BB & IF processingBB IF
Channel #1 f1
Channelcode/decode
Modulator/Demodulator
BPF
Channel #2 f2
Channelcode/decode
Modulator/Demodulator
BPF
Channel #5 f5
Channelcode/decode
Modulator/Demodulator
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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)
PHY Header, Mac Header, HCS,Pad
(Payload+FCS),Pad,ch. coding
DQPSK (25Mbps)
112 bits
1984 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)After dividing (payload+FCS) to 5 chMAC Header
80 bits 1645 bits
(Payload+FCS)
1645 bits
1664 bits
(Payload+FCS),PadAdd Pad
Error Correction filed (BCH(31,26))
FCS : Frame Check Sequence HCS : Header Check Sequence Pad : Padding
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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)
Submission Reed Fisher , Oki
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)
Submission Reed Fisher , Oki
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)
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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).
Submission Reed Fisher , Oki
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 -
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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
16QAM (50Mbps)
May,2003 IEEE P802.15-03/120r0
Figure 13. PHY frame format: 5 channels
A.2. Payload Bit Rate and Data Throughput
Submission Reed Fisher , Oki
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) 16QAM (50Mbps)
112 bits
1984 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)After dividing (payload+FCS) to 5 chMAC Header
10 Bytes (80 bits) 1645 bits
(Payload+FCS)
1645 bits
1664 bits
(Payload+FCS),PadAdd Pad
Error Correction filed (BCH(31,26))
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
Submission Reed Fisher , Oki
122.9Mbps (49.2%)
135.9Mbps (54.4%)
Payload bit RateData Throughput
250Mbps 16QAM
ModulationSingle Frame Multiframe
122.9Mbps(49.2%)
135.9Mbps(54.4%)
Payload bit RateData Throughput
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
Submission Reed Fisher , Oki
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)
Submission Reed Fisher , Oki
- 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)
Submission Reed Fisher , Oki
- 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
Submission Reed Fisher , Oki
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
Submission Reed Fisher , Oki
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