OFDMA SYSTEM
Mobile WiMAX 802.16e
and Next Generation PHS
Fire Tom Wada
Professor, Information Engineering,
Univ. of the Ryukyus
9/30/2015
System Architecture 2008
1
New Broadband Wireless Access
Service in Japan

Japan government assigned 2.5GHz BWA
bands to Two Companies on
2007/December.
1. UQ communications (KDDI)


2,595MHz - 2,625MHz 30MHz bands
Mobile WiMAX (802.16e, OFDMA)
2. Willcom




2,545MHz - 2,575MHz
(2,545 - 2,555MHz after 2014)
XG-PHS (OFDMA, SC-FDMA)
They starts service on 2009.
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Wireless Communication Services

In-door
◦ WLAN
 802.11b (CDMA) → 802.11g/a (OFDM) →
802.11n (MIMO-OFDM)

Out-door
◦ Cell Phones
 PDC, CDMA, CDMA2000, WCDMA →
3.9G LTE (OFDMA, SC-FDMA)
 PHS → XG-PHS (OFDMA, SC-FDMA)
◦ New
 WiMAX (802.16d, OFDMA) →
Mobile WiMAX (802.16e, OFDMA)
ALL systems are shifting to OFDM/OFDMA.
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UQ communications

Mobile WiMAX

Schedule
◦ 2008/8 ： 1st Base Station
◦ 2009/2： Experimental Service in
Tokyo/Yokohama
◦ 2009/summer：Public service starts
in limited area
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Willcom WILLCOM CORE :
Next Generation PHS(XGPHS)
2009/4：limited Area Service in Tokyo
 2009/10：Public Service Starts in
Tokyo, Nagoya, Osaka
 - 2012/3: All prefecture’s capital city
 - 2013/3： Other city Area in Japan

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Multiple Access
DownLink
UpLink
Base Station
(BS)
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Multiplexing

Separate Downlink and Uplink
 FDD : Frequency Division Duplex
 TDD: Time Division Duplex

Separate Each User
 FDD : Frequency Division Duplex
 TDD: Time Division Duplex
 OFDM: Orthogonal Frequency Division Multiple
Access

BWA systems
Mobile WiMAX, XG-PHS use TDD-OFDMA!
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OFDMA
Spectrum
User A
User C
User A
User B
Frequency
User B
Frequency
BS
User C
User C
User B
User A
Time
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OFDM vs OFDMA (1)
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OFDM vs OFDMA (2)
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(1)
MOBILE WIMAX
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IEEE 802.16e
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802.16e Mobile WiMAX Highlights

16e targeting 1-3 mile radius mobile broadband
connection for pedestrians and automobiles.
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Applications for 16e

According to QoS (Quality of Service)
levels, most of applications are covered.
Mobile
Phone
Video
Phone
Internet
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Scalable OFDMA service
According to available BW, several
FFT sizes are supported.
 Table shows an example.

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Data Rate example

Frame = 10ms
◦ Downlink = 7.5ms
◦ Uplink = 2.5ms

10MHz Bandwidth
28.29
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Mobile WIMAX 8.75MHz SPEC




BW
n
Sampling Freq
FFT size
8.75MHz
8/7
10.000MHz
1024

◦ QPSK,16/64QAM






CC
◦ DL R=1/2, 2/3, 3/4, 5/6
◦ DL Null=184, Pilot=120, Data=720
◦ UL Null=184, Pilot=280, Data=560

Modulation
◦ UL R=1/2, 2/3, 5/6
# of sub-channels

◦ DL (2cluster)
◦ UL (6 tile)

30 channel
35 channel
Sub-carrier space 9.765625KHz
Useful Symbol Tb 102.4us
Guard Interval Tg
12.8us
OFDM symbol Ts115.2us
Symbols in Frame 48(5ms frame)
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Repetition x2, x4, x6
Data Channel
◦ DL PUSC only
◦ UL PUSC only
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Frame Structure
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Frame






Preamble: PN code of Base Station ID
FCH: frame control header
DL-MAP: detail Downlink information
UL-MAP: detail Uplink infromation
Burst: user data
Sub-Channel: group of sub-carriers
◦ FUSC（downlink fully used subchannelization）
◦ PUSC（Partially used subchannelization）
◦ Advance Modulation and Coding subchannels （AMC）
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PUSC (partially used subchannel)
Freque
ncy
Preamble
Preamble
Data
Pilot
cluster
Time
p 0 1 2 3 4 5 6
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802.16e Transceiver Architecture
Bit
deinterleave
RX
Down
conversion
A/D
resample
derotator
equalize
de
randomize
Viterbi
permutation
demap
Repetition
depuncture
AGC
Media
Access
Control
FFT
/
IFFT
TX
Up
conversion
D/A
Interpolator
(S/W )
Invpermutation
rotator
Bit
interleave
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map
Convolution
Coding
Repetition
puncture
randomize
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(2)
XG-PHS
NEXT GENERATION
PERSONAL HANDYPHONE SYSTEM
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PHS MoU
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PHS and XG-PHS
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XG-PHS OFDM TYPE4 10MHz Spec




System BW
Effective BW
Sampling Freq
FFT size
10.0MHz
9.0MHz
19.2MHz
512

5.000ms
◦ 96000 point in 19.2Msps

◦ 24subcarrier/PRU * 10 PRU
◦ 240subcarrier

Frame length
Number of PRU in Frequency axis
UL/DL
2.5ms
◦ SLOT
625us
 Head Guard
 Burst Time
 Tail Guard
21.67us
573.33us
30.00us
◦ 10 PRU

Sub-carrier space
Useful Symbol Tb
Guard Interval Tg

OFDM symbol Ts


37.5KHz
26.67us
1/4(S1)=6.66us
1/8(他)=3.33us
1/4(S1)=33.33us
1/8(他)=30.00us
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Data Rate example

Frame = 5ms
◦ Downlink =Uplink = 2.5ms

10MHz Bandwidth
◦ 40PRU (4Cch, 36Ich) for each down/up link
 4 CCH PRU + 36 ICH PRU
 CCH: 324 sc * 4=1296sc/2.5ms (BPSK, R=1/2)
 ICH: 372sc*36=13392sc/2.5ms

ICH Performance (DL+UL)
Code Rate
R=1/2
R=2/3
R=3/4
R=5/6
R=7/8
ICH Peromance (Mbps)
QPSK(2b/sc) 16QAM(4b/sc) 64QAM(6b/sc) 256QAM(8b/sc)
5.36
10.71
16.07
21.43
7.14
14.28
21.43
28.57
8.04
16.07
24.11
32.14
8.93
17.86
26.78
35.71
9.37
18.75
28.12
37.50
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Time Domain
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Frequency Domain
UL
2500us
Slot
650us
Low
24 subcarrier
SubChannel SCH
DL
2500us
Time
PRU1
PRU2
PRU3
PRU4
PRU1
PRU2
PRU3
PRU4
SCH 1
PRU5
PRU6
PRU7
PRU8
PRU5
PRU6
PRU7
PRU8
SCH 2
1 SCH is used for
PRU9
PRU10 PRU11 PRU12 PRU9
PRU10 PRU11 PRU12
SCH 3
PRU13 PRU14 PRU15 PRU16 PRU13 PRU14 PRU15 PRU16
SCH 4
Common channel
CCH
PRU17 PRU18 PRU19 PRU20 PRU17 PRU18 PRU19 PRU20
SCH 5
PRU21 PRU22 PRU23 PRU24 PRU21 PRU22 PRU23 PRU24
SCH 6
PRU25 PRU26 PRU27 PRU28 PRU25 PRU26 PRU27 PRU28
SCH 7
PRU29 PRU30 PRU31 PRU32 PRU29 PRU30 PRU31 PRU32
SCH 8
PRU33 PRU34 PRU35 PRU36 PRU33 PRU34 PRU35 PRU36
SCH 9
PRU37 PRU38 PRU39 PRU40 PRU37 PRU38 PRU39 PRU40
SCH 10
Other SCHs are
used for Individual
channel
ICH
High
Frequency
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Control Common Channel CCH PRU structure
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Individual Channel ICH PRU structure
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CCH and ICH
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Summary
Next Generation Broadband Wireless
Access services are introduced.
 OFDMA is key Technology.
 New two services coming soon in Japan

1.
2.
◦
◦
Mobile WiMAX (IEEE 802.16e)
XG-PHS
TDD-OFDMA
Several ten’s Mbps similar to WLAN for
large area
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Final Report Task
Choose one digital system using FPGA,
DSP, Processor.
 Investigate the Hardware architecture and
describe it in the report.

Dead line : Feb 13th Friday.
 Language: English or Japanese
 Send PDF file to [email protected]

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