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ISO 17854:2013

(Main)

Space data and information transfer systems — Flexible advanced coding and modulation scheme for high rate telemetry applications

Space data and information transfer systems — Flexible advanced coding and modulation scheme for high rate telemetry applications

ISO 17854:2013 defines an efficient and comprehensive coding and modulation solution able to support a wide range of spectral efficiency values and data rates. The main target is given by high data rate telemetry applications, i.e. Earth Exploration Satellite Service (EESS) telemetry payload, where the increase of the system throughput by means of advanced adaptive techniques is deemed essential in order to fulfil the requirements imposed by future missions. ISO 17854:2013 presents a turbo-like coding/modulation scheme based on one possible realization of a Serial Concatenated Convolutional Code (SCCC). This scheme makes use of a set of a large variety of modulation techniques (including QPSK, 8PSK, 16APSK, 32APSK, and 64APSK) and a wide range of coding rates. The number of different modulation schemes available, combined with a properly selected coding rate, allows the overall system to make efficient use of the available bandwidth, adapting itself to the variable conditions of the link. The proposed scheme can implement Variable Coding and Modulation (VCM) mode, which varies the transmission scheme to the channel conditions following a predetermined schedule (for example, as a function of the elevation angle). When a channel is available to provide feedback (e.g. via Telecommand), the transmission scheme can be dynamically adjusted using the Adaptive Coding and Modulation (ACM) mode. The proposed coding scheme is easily adapted to any of the available modulation formats thanks to the pragmatic approach adopted: the outputs of the binary encoders are mapped to the considered modulation scheme, after being interleaved. In other words, a bit-interleaved coded modulation scheme is proposed. The use of SCCC is intended mainly for high data rate applications. The Forward Error Correction (FEC) scheme is based on the concatenation of two simple four-state encoder structures. The SCCC scheme implies a Physical Layer frame of constant length, with pilots inserted in fixed positions. This architecture simplifies the synchronization procedure, thus further allowing fast and efficient acquisition at very high rates for the receiver. ISO 17854:2013 describes a technique incorporating multiple modulation formats paired with a flexible coding and synchronization method in a tightly integrated fashion. In particular, ISO 17854:2013 provides a series of recommended formats where each format pairs a modulation technique with a tailored implementation of the coding and synchronization method. However, where these modulations and/or codes are recommended in other CCSDS documents, ISO 17854:2013 does not limit the choice of modulations and/or codes consistent with those recommendations.

Systèmes de transfert des informations et données spatiales — Schéma de modulation et de codage flexible avancé pour applications en télémesure à haut débit

General Information

Status
Published
Publication Date
28-May-2013
ICS
49.140 - Space systems and operations
Technical Committee
ISO/TC 20/SC 13 - Space data and information transfer systems
Drafting Committee
ISO/TC 20/SC 13 - Space data and information transfer systems
Current Stage
9060 - Close of review
Start Date
04-Mar-2029
Ref Project

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ISO 17854:2013 - Space data and information transfer systems -- Flexible advanced coding and modulation scheme for high rate telemetry applicationsISO 17854:2013 - Space data and information transfer systems -- Flexible advanced coding and modulation scheme for high rate telemetry applications
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ISO 17854:2013 - Space data and information transfer systems -- Flexible advanced coding and modulation scheme for high rate telemetry applications
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INTERNATIONAL ISO
STANDARD 17854
First edition
2013-06-01

Space data and information transfer
systems — Flexible advanced coding and
modulation scheme for high rate
telemetry applications
Systèmes de transfert des informations et données spatiales —
Schéma de modulation et de codage flexible avancé pour applications
en télémesure à haut débit




Reference number
ISO 17854:2013(E)
©
ISO 2013

---------------------- Page: 1 ----------------------
ISO 17854:2013(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any
means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission.
Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
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Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2013 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 17854:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
ISO 17854 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 131.2-B-1, March 2012) and was adopted (without modifications except those stated in Clause 2 of
this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 13, Space data and information transfer systems.

© ISO 2013 – All rights reserved iii

---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 17854:2013(E)

Space data and information transfer systems — Flexible
advanced coding and modulation scheme for high rate
telemetry applications
1 Scope
This International Standard defines an efficient and comprehensive coding and modulation solution able to
support a wide range of spectral efficiency values and data rates. The main target is given by high data rate
telemetry applications, i.e. Earth Exploration Satellite Service (EESS) telemetry payload, where the increase
of the system throughput by means of advanced adaptive techniques is deemed essential in order to fulfil the
requirements imposed by future missions.
This International Standard presents a turbo-like coding/modulation scheme based on one possible realization
of a Serial Concatenated Convolutional Code (SCCC). This scheme makes use of a set of a large variety of
modulation techniques (including QPSK, 8PSK, 16APSK, 32APSK, and 64APSK) and a wide range of coding
rates. The number of different modulation schemes available, combined with a properly selected coding rate,
allows the overall system to make efficient use of the available bandwidth, adapting itself to the variable
conditions of the link. The proposed scheme can implement Variable Coding and Modulation (VCM) mode,
which varies the transmission scheme to the channel conditions following a predetermined schedule (for
example, as a function of the elevation angle). When a channel is available to provide feedback (e.g. via
Telecommand), the transmission scheme can be dynamically adjusted using the Adaptive Coding and
Modulation (ACM) mode. The proposed coding scheme is easily adapted to any of the available modulation
formats thanks to the pragmatic approach adopted: the outputs of the
...

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