Presented by Eric Bader HF & VHF MKTG Segment Manager
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1 1 / Presented by Eric Bader HF & VHF MKTG Segment Manager
2 2 / CONSTRAINTS OF HF TRANSMISSION The HF propagation depends on the sun activity Modification of the ionosphere features The sun activity depends on the place and the date of transmission. Usable HF frequencies depend on the LUF and MUF given for a spot at a period of time The D layer of ionosphere disappears during the night LUF and MUF are different during the day and night HF TRANSMISSION : a world apart
3 3 / HF TRANSMISSION PROCEDURE To perform long distance transmission, HF uses the ionosphere properties HF Performances linked to the quality of ionosphere First step : identify the usable frequencies. Use existing free prediction software as VOACAP to set up of frequency list Second Step : Start the procedure of link establishment Based on the frequency list, the transceiver : chooses one frequency among the list Tries to set up a link with one or several transceivers Exchanges ARQ information reflecting the link quality Third Step : If ARQ positive answer then a communication can start HF TRANSMISSION NEEDS AUTOMATIC PROCESSES
4 4 / Fading effects Unpredictable fading Fading effect can destroy the useful signal or a part of the useful signal Layer F Layer E Unwanted signal Useful signal Inaudible Channel THE RESULT IS AN INAUDIBLE SIGNAL IN THE WORSE CASE
5 5 / Noise effects Noise Noise in HF can occur from the space, the storm or from industrial activities Layer F Layer E Noisy Channel THE RESULT IS AN INAUDIBLE SIGNAL IN THE WORSE CASE
6 6 / Occupied channel Occupied channel Any HF channel can be used by an other user Jammed channel Presence of jammers Layer F Layer E Occupied Channel Jammed Channels THE RESULT IS AN INAUDIBLE SIGNAL IN THE WORSE CASE
7 7 / Wide band HF transmissions have to face some constraints linked to : the HF propagation and its use One way to avoid / minimize the HF constraints is to scan continuously the HF spectrum to identify the useable frequencies Modify or Hide in the header / footer properties : Date
8 8 / Our proposal consists in : Cleaning the HF spectrum continuously Determining the available Frequencies Distributing the content over non contiguous channels ( or contiguous if it s possible) Modify or Hide in the header / footer properties : Date
9 9 / Generation of a hop set AUTOMATIC SELECTION OF FREE FREQUENCIES WITHIN THE HOP BAND Analysis of the spectrum Cleaning of the hop set F min Usable Frequencies F max Broadcast the new free hop set F min F max Jammers F min Usable Hop Set F max With ALE 100 % successful
10 10 / THALES PROPOSAL : Scan the HF spectrum and check on each the quality Perform independent channel modulation respecting the Stanag 4539 Withdraw any channel with a low SNR Perform a dynamic process of channel selection Modify or Hide in the header / footer properties : Date HF XL : an alternative solution for Wideband transmission
11 11 / ADVANTAGES : NO Issues of jammers or unwanted HF frequency occupation Automatic process that guaranties High level of QoS Re-Use of Current ST 4539 Full Interoperability with legacy HF radio (if transmission on 1 channel or BLI) Offer potential high bit rate roughly 100 kbps with 24 KHz canalization DRAWBACKS : Need higher power (6 db back off) Need wideband antenna and antenna tuning box Digital processing is a little more complex than current (n x ST 4539) modem
12 12 / TO BE PERFORMED: Standardization of this process..request will be sent to the NATO group Light modification of the Stanag 4539 Autobaud for calling the HF XL Modify or Hide in the header / footer properties : Date
13 13 / One prototype is under tests today We have just started our measurement campaign and tested our solution Over 300 km (from Thales headquarter to our production Site) with no limitation of channel number We have used our broadband tactical antenna We have reused our tactical amplifier 400W with certain modifications
14 14 / Results obtained: max birate during certain periods of the day : 138 kb/s (TEB <10-5 ) o 15 channels used 64 kb/s bitrate (TEB <10-5 ) obtained regularly during the day o 8 to 15 channels used NEXT STEP Confirm our results over 1000 km Modify or Hide in the header / footer properties : Date
15 15 / Stanag modification Mil 110C :Medium HF XL: light Tactical transmission Mil 110C : well adapted to tactical HF XL: better adapted to high power transmission (back off) Bite Rate Mil 110C : < 100 Kbps HF XL : could be higher if nb channel > 8 138Kbps 15 Channels Implementation Mil 110C : easier modification HF XL : more sophisticated Adpative process Mil 110C : No HF XL: Yes continuously Efficiency against Jammers Mil 110C : No HF XL: High/ Adaptive allocation International regulation Mil 110C :mandatory for eight channels HF XL: no need Power amplification Mil 110C :mandatory mono carrier HF XL: need 6 db back-off..multicarrier
16 16 / Titre de la planche / Slide Title THALES POSITION FOR THE FUTURE 4G HF NETWORK Thales is developing both Solutions All solutions have advantages and issues to be fixed Thales proposal will be fully checked within 2012 Next rendez vous in 2012 for a test over 1000 km with the maximum channels available over H24 Modify or Hide in the header / footer properties : Date
17 17 / THANK YOU FOR YOUR ATTENTION eric.bader@thalesgroup.com Modify or Hide in the header / footer properties : Date
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