|
Work item:
|
J.atrans-spec
|
|
Subject/title:
|
Advanced digital downstream transmission systems for television, sound and data services for cable distribution
|
|
Status:
|
[Carried to next study period]
|
|
Approval process:
|
AAP
|
|
Type of work item:
|
Recommendation
|
|
Version:
|
New
|
|
Equivalent number:
|
-
|
|
Timing:
|
-
|
|
Liaison:
|
-
|
|
Supporting members:
|
-
|
|
Summary:
|
The new Recommendation specifies a "second generation" modulation and channel coding system, covering a variety of applications by cable and is characterized by:
- a framing scheme which supports a flexible input format with packetized or continuous stream;
- a high efficient FEC schemes, allowing Quasi Error Free operation close to the Shannon limit, depending on the transmission mode (AWGN channel, modulation constrained Shannon limit);
- a modulator with flexible code rates and high order constellations in HFC based network;
- Adaptive Coding and Modulation (ACM) functionality, optimizing channel coding and modulation on a frame by-frame basis.
|
|
Comment:
|
-
|
|
Reference(s):
|
|
|
Historic references:
|
|
Contact(s):
|
|
| ITU-T A.5 justification(s): |
|
|
|
|
First registration in the WP:
2012-07-04 17:13:50
|
|
Last update:
2012-10-02 16:46:55
|
