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Page 1: W w w. w o o d a n d d o u g l a s. c o. u k dVMo – Digital Video for Moving Objects COFDM Digital Video / Data Link 1

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dVMo – Digital Video for Moving ObjectsCOFDM Digital Video / Data Link

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WHAT IS dVMo ?

The dVMo family is a range of products using COFDM techniques to provide a highly resilient radio transmission platform that can delivery voice, video and data information for all manner of applications.

dVMo is particularly suited to the reception of transmissions from moving transmitters, normally a difficult undertaking due to so many reflections being created from adjacent objects.

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SYSTEM COMPONENTS

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WHAT IS COFDM ?

Coded Orthogonal Frequency Division MultiplexThe transmitted signal comprises 2000 carrier frequencies. The data

to be sent over air is spread over these 2000 carriers. Fading due to multipath interference is frequency selective. A loss of some carriers does not result in total loss of reception.

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28 MHz

8 MHz

2000 carriers 2000 carriers

Null causedby multipath

8 MHz

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COFDM, DVB-T, TRANSPORT STREAMS

COFDM is a transmission technique popularised by the broadcast industry allowing the transmission of high data rate signals across 2000 carriers in an 8MHz RF bandwidth.

The DVB-T standard allows multiple services to be uniquely tagged and carried in a single Transport Stream for later retrieval (‘unpicking’) at a receiver site.

Any information can be carried across such a link providing it is made to ‘look like’ part of the transport stream.

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LINK CAPABILITY

The W&D dVMo product is a radio link based on the DVB-T standard using COFDM techniques.

As standard the dVMo link has the capacity to carry a single video, 2 audio and a RS232 low bit rate data stream.

The dVMo link has an external MUX input allowing a secondary DVB-T transport stream to be ‘added into’ the internally generated stream.

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TRANSMITTER & MUX CONCEPT

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TRANSMITTERS

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LINEAR AMPLIFIERS

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DIVERSITY RECEIVER

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DIVERSITY CONCEPT

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MASTHEAD COMPONENTS

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RECEIVERS

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IP CONFIGURATION

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IP DEVICES

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LINK CAPACITY

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PROFILE CONTROLLERS

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ACCESSORIES

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RAPID DEPLOYMENT UNITS

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REPEATER INSTALLATIONS

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FREQUENCY OPTIONS

320 – 360MHz 800 – 860 MHz 1.2 – 1.4 GHz 1.9 – 2.3 GHz 3.4 – 3.6 GHZ 5.0 – 5.6 GHz

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The following bands are available as standard builds : -

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DEPLOYMENT SCENARIOS

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MOBILE TO FIXED BASE STATION

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MOBILE TO MOBILE (Car following)

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REPEATER RANGE EXTENSION

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AIR TO GROUND WITH TELECONTROL

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DIVERSITY SECTORED ANTENNA

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SECTOR DIVERSITY COMBINING

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MOBILE WEBCAM

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The Wood and Douglas range of dVMo products are available in Australia / New Zealand and other countries in the SE Asia / Pacific Rim region from:

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Decibel Engineering Pty Ltd

21 Woods Parade, Fairlight, NSW 2094, Australia

w: www.decibelengineering.com

e: [email protected]

p: +61 2 9948 6564


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