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BroadbandFixed Wireless
2N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
1 GHz 2.5 3.5 5.8 10 24 26 28 38 40 60
LOSLOS
5000200013501000400 30020020 30
Voice, Data, Fax,
ISDN256 Kbps256 Kbps
1 to 501 to 50MbpsMbps
+ TDMLeased Lines
Ban
dwid
th(M
Hz)
1400200
100
Spectrum Availability
+ High SpeedInternet and Multimedia
+ UltraHigh-SpeedLAN/WAN
No LOSNo LOS
10 to 10010 to 100MbpsMbps
>100 Mbps>100 Mbps
LMDSMMDS UNII
2Ghz to 40GhzUnlicensed National Information InfrastructureMultichannel Multipoint
Distribution ServiceLocal Multipoint Distribution Service
3N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
1 GHz 2.5 3.5 5.8 10 24 26 28 38 40 60
LOSLOS
5000200013501000400 30020020 30
Voice, Data, Fax,
ISDN256 Kbps256 Kbps
1 to 501 to 50MbpsMbps
+ TDMLeased Lines
Bandwidth(MHz)
1400200
100
Spectrum Availability Worldwide
+ High SpeedInternet and Multimedia
+ UltraHigh-SpeedLAN/WAN
No LOSNo LOS
10 to 10010 to 100MbpsMbps
>100 Mbps>100 Mbps
4N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
MMDS
• MMDS - Multichannel Multipoint Distribution Service
• FCC regulated wireless cable system• Delivery of multiple video signals via point-
to-multipoint microwave transmissions• Comprised of 33 microwave frequencies in
2.5 GHz band
5N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
UNII
• UNII – Unlicensed National Information Infrastructure
• Located in 5.2 – 5.8 GHz bands
6N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
LMDS
• LMDS – Local Multipoint Distribution Service• Located in 28 GHz and 31 GHz bands• Broadband radio service designed to provide
two way transmission of voice, high speed data and video
• Low powered transmitters broadcast voice, data and video signals in metropolitan areas
7N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Spectrum: Horses for Courses
• Less than 6 GHzLong range (up to 30 miles), Non LOS, not affected by weatherLow-cost equipment - residential and SOHO CPESpectrum suitable for mass market deployments
• Greater 6 GHzLOS, short range (1-3 miles), affected by weather, more spectrum (1Ghz)Spectrum used specifically for urban deployments to Large business or Multi-tenant units
8N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Reach Distance From Hub
Point-to-Point Links Point-to-Multipoint
28 GHz
38 GHz
5.34 6.92 Reach Distance*, Km
*Assume Rain Zone K, Single Channel per Transmitter, same power, same dB gain antennaes for all frequencies.
Reach Distance**, Km
**Assume Rain Zone K, 6cm antennae for 99.995% average availability, vertical polarization.
3.57 7.5 5.0
2.5 GHz
20.050.0
23 GHz
6 GHz
28 GHz
2.5 GHz
24 GHz
40
9N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
P2P vs P2MP
P2Pdedicatedbandwidth
P2MP shared
bandwidth
P2MP Sector
10N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Cost per Subscriber by Network
CPE Cost
PTP
PMP
# of Subscribers
Cos
t Per
Sub
scrib
erThis is the point at
which PMP becomes more economically viable than
a PTP network, generally ~8 links.
11N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Unified Broadband Wireless Reference Architecture
Standard I.F.
WirelessServiceModules
Small Office
Branch Office
SOHOTelecommuter
PBX
CPENetworks
End-to-End Services, Network Management,Provisioning AND Billing
Backhaul Network
FCC Compliant R.F.
IPATMWDM
FR
Any RF band Consumer
38 GHZ38 GHZRadioRadio
LMDSLMDSRadioRadio
UNIIUNIIRadioRadio
MMDSMMDSRadioRadio
10 GHZ10 GHZRadioRadio
38 GHZ38 GHZRadioRadio
LMDSLMDSRadioRadio
UNIIUNIIRadioRadio
MMDSMMDSRadioRadio
10 GHZ10 GHZRadioRadio
IndustrySuppliers
IntegratedWireless MAC
38 GHZ38 GHZRadioRadio
OtherOther
SATSAT
12N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Key Features
• IP Packet Based Solution with DOCSIS 1.1 support• Up to 44.4 Mbps full-duplex throughput• Up to 25 Miles in connection distance• Fiber quality link
> 10-11 BER for Data, > 10-8 BER for Voice
• Supports both MMDS (2.5 GHz) and UNNI (5.7 GHz)• Encryption support: 56 bit DES with RSA key
management
13N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
The Problem
“
”
Line-of-Sight:
The technology, while promising, continues to have nagging "line-of-sight" issues. Wireless signals in these systems must have a clear path to travel as they bounce from rooftop to rooftop. Trees, buildings and even inclement weather, such as snow and pelting rain, can cause static, dropped calls and hazy connections.
Leslie Cauleystaff reporter in The Wall Street Journal's New York bureau
September 20, 1999
14N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
The Solution
• VOFDM (Vector Orthogonal Frequency Division Multiplexing) technology
• employs both frequency and spatial diversity
• creates a robust processing technique for multipath fading and narrow band interference
• VOFDM enables greater coverage
• substantially reduces LOS limitations
…
SubscriberBase Station
Paths
…
15N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel
Transmit Spectrum
Receive Spectrum
Channel Training ToneData Tone
What is VOFDM?
• Each VOFDM burst carries data and training
Allows for variation inthe channelReduces effect of frequency offset
• VOFDM, interleaving and coding
Create a robust processing technique for multipath fading and narrow band interference
Questions ???