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IEEE 802.15 <subject>

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Title: IEEE 802.15 <subject>


1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
TG3a Oki CFP Presentation Date Submitted 3
March, 2003 Source Reed Fisher Company
Oki Electric Industry Co., Ltd.
Address 2514 E.
Maddox Rd., Buford, GA 30519 USA.
Voice1-770-271-0529

E-Mailreedfisher_at_juno.com
Hiroyo Ogawa Company Communication Research
Laboratory Independent
Administrative Institution
Address 3-4 Hikarino-oka,
Yokosuka, Kanagawa, 239-09847 Japan.
Voice81-46-847-50
70, FAX81-46-847-5079
E-Mailhogawa_at_crl.go,jp Re
CFP presentation AbstractMillmeter-wave
ad-hoc wireless system for the alternate PHY to
IEEE802.15.3 MACPHY Standard
for Alt PHY PurposeProposal for an alternate
PHY to IEEE802.15.3 MACPHY 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. ReleaseThe
contributor acknowledges and accepts that this
contribution becomes the property of IEEE
and may be made publicly available by
P802.15.
2
Millimeter-Wave Ad-hoc Wireless System
3
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 band
  • Complete cancellation of phase noise and
    frequency-offset by
  • self-heterodyne transmission and detection
    technique

4
Application Images
  • Basic Ad-hoc system based on 802.15.3a
    applications
  • Ad-hoc information distribution system
  • ad-hoc coverage area extension
  • using P-P millimeter-wave link

5
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.
6
Base Band (BB) IF processing
1) Single channel structure
Frequency allocation of IF band
2) Multi-channel structure
BB IF processing
BB
IF
Input data
Packet distribute
MAC control
Tx
C
Channel code/decode
Modulator /Demodulator
BPF
25Mbps
f1
Channel 1
C
Channel code/decode
Modulator /Demodulator
BPF
25Mbps
RF
f2
Channel 2
C
Channel code/decode
Modulator /Demodulator
BPF
Rx
25Mbps
f5
Channel 5
7
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)

Pt
Pr
Local leak DSB mixer
Receiver
Transmitter
2B
IF output
NFF
T
fi
fc
B
B
B
IM2
f
fc
fcfi
fc-fi
fi
B
8
PHY Frame Format (Single channel structure)
9
PHY Frame Format(Multi-channel structure)
10
Interference and Susceptibility
Interference 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). ltCalculation for
interference from other standard systemgt
(Rx filter attenuation is calculated by using
N-degree Butterworth filter)
11
Coexistence
The interference impacted to microwave band
systems, from this proposed system, is
sufficiently smaller than the Rx sensitivity of
the microwave sys-tems. Therefore, coexistence
is assured. ltCalculation of interference
impacted to other standard system from this
proposal systemgt
12
Payload Bit Rate and Data Throughput
Data Throughput
Payload bit Rate
Modulation
Single Frame
Multi frame
77Mbps (61.6)
82Mbps (65.6)
125Mbps
DQPSK
13
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
Piconet1
Piconet2
MS
MS
MS
Interference signal I
Desired signal S
At Tx antenna gain Rx antenna gain 8 dBi
Reference Transmitter
Test Receiver
Interference Transmitters
Tx antenna gain 8 dBi
dint
Path loss at 1 meter 68 dB
Rx antenna gain 8 dBi
Tx power 10 dBm
-42 dBm
System loss 13 dB
-50 dBm
-55 dBm
-60.3 dBm
SNR 12.7 dB
Proposal Min. Rx level-66.3 dBm
Path loss at dint meter 18 dB
-73 dBm
-73 dBm
( dint meter 7.94 m)
14
Signal Acquisition
  • Miss detect probability of AWGN channel
  • - Miss detect probability (Pmd) is probability
    which causes bit error more than 2 bits.
  • - 1 bit error is permitted to detect unique
    word.
  • - Eb/N0 6.7 dB at Pmd8 x 10-2
  • - Calculation of Pmd is as follows
  • BER (Bit Error Rate) 1/2 erfc 2(Eb/N0)1/2
    sin(p/8)
  • Pmd_1ch 1 - (1 - BER)x (1 - BER)(x-1) BER
    x
  • 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

15
Signal Acquisition
  • False alarm probability of AWGN channel
  • - False alarm probability (Pfa) is probability
    which detects unique word 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 length
  • 2139 (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
  • Pfa1 - (1 - Pfa_1ch)5 1 (1 2.04
    x 10-3)5 1.02 x 10-2
  • 5 Number of channel

16
System Performance
  • Required Eb/N0 for PER 8 in AWGN channel
  • - Required Eb/N0
  • 9.7dB (125Mbps, DQPSK)
  • - Calculation of Psys is as follows
  • BER1 1/2 erfc 2(Eb/N0)1/2 sin(p/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)P2P3
  • 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

17
System Performance
  • PER vs Eb/N0 characteristics of AWGN channel

At 125 Mbps (DQPSK)
18
System Performance
  • PER vs Distance characteristics of AWGN channel
  • - 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

At 125 Mbps (DQPSK)
19
Sensitivity
Receiver Sensitivity Noise PowerRequired Eb/N0
Modulation Loss
Self-heterodyne LossChannel Multiplex Loss
Bit Rate
Term
Note
125Mbps(DQPSK)
-92dBm
Noise Power
-174dBm/Hz10log10(25MHz)8dB(NF)
Required Eb/No
PER lt8
9.7dB
Modulation Loss
3dB
6dB
Self- heterodyne Loss
10log10 (4)
7dB
10log10(5)
Channel Multiplex Loss
Receiver Sensitivity
-66.3dBm
20
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.

21
Regulatory Compliance
22
Scalability
  • 125 Mbps data rate is supported by multi-channel
    (25 Mbps5 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).

23
Self-Evaluation -General Solution Criteria-
24
Self-Evaluation -PHY Protocol Criteria-
25
Self-Evaluation -MAC Protocol Enhancement
Criteria-
26
Appendix Optional proposal for 250 Mbps
27
PHY Frame Format(Single channel structure)
28
PHY Frame Format(Multi-channel structure)
29
Payload Bit Rate and Data Throughput
30
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
Piconet1
Piconet2
MS
MS
MS
Interference signal I
Desired signal S
At Tx antenna gain Rx antenna gain 8 dBi
Reference Transmitter
Test Receiver
Interference Transmitters
Tx antenna gain 8 dBi
dint
Path loss at 1 meter 68 dB
Rx antenna gain 8 dBi
Tx power 10 dBm
-42 dBm
System loss 13 dB
-50 dBm
-55.8 dBm
-55 dBm
Proposal Min. Rx level-61.8 dBm
SNR 17.2 dB
Path loss at dint meter 18 dB
-73 dBm
-73 dBm
( dint meter 7.94 m)
31
System Performance
  • Required Eb/N0 for PER 8 in AWGN channel
  • - Required Eb/N0
  • 11.2dB (250Mbps/16QAM)
  • - Calculation of Psys is as follows
  • BER1 1/2 erfc 2(Eb/N0)1/2 sin(p/8) for
    DQPSK from (Preamble to HCS)
  • BER 1 (3/8) erfc((CNR/10)1/2) for
    16QAM for (PayloadFCS)
  • 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)P2P3
  • 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

32
System Performance
  • PER vs Eb/N0 characteristics of AWGN channel

At 250 Mbps (16QAM)
33
System Performance
  • PER vs Distance characteristics of AWGN channel
  • - 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.

At 250 Mbps (16QAM)
34
Sensitivity
Receiver Sensitivity Noise PowerRequired Eb/No
Modulation Loss
Self-heterodyne LossChannel Multiplex Loss
Bit Rate
Term
Note
250Mbps(16QAM)
-92dBm
Noise Power
-174dBHz10log10(25MHz)8dB(NF)
11.2dB
Required Eb/No
PER lt8
Modulation Loss
6dB
6dB
Self- heterodyne Loss
10log10 (4)
7dB
10log10(5)
Channel Multiplex Loss
Receiver Sensitivity
-61.8dBm
35
Link Budget for 250 Mbps
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