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AHA4702 Datasheet Preview

AHA4702 Datasheet

DVB-S2 Compliant LDPC/BCH Forward Error Correction (FEC) Decoder Core

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comtech aha corporation
PRELIMINARY PRODUCT BRIEF
AHA4702
DVB-S2 Compliant LDPC/BCH
Forward Error Correction (FEC) Decoder Core
INTRODUCTION
FEATURES
The AHA4702 FEC decoder core is fully ENCODER/DECODER:
compliant with section 5.3 of the Digital Video • DVB-S2 compliant
Broadcast S2 (DVB-S2) standard. It is capable of • LDPC inner code with a BCH outer code
85 Mbit/sec user data rate with a 2/3 rate LDPC • 36 Msymb/s channel rate
Code and 25 iterations in an FPGA. The core • Supported codes: 1/4 through 9/10 code rates
supports all codes, frame sizes, and interleave
schemes set forth in the DVB-S2 specification for
broadcast, interactive, digital satellite news
gathering, and professional services. The core
ryallows code and modulation changes on a block-by-
block basis to fully support both Adaptive Coding
and Modulation (ACM) and Variable Coding and
aModulation (VCM).
inThe AHA4702 FEC decoder core is comprised
of a Low Density Parity Check (LDPC) inner code
concatenated with a BCH outer code. It provides a
limwide range of code rates from 1/4 to 9/10 and
interleave depths from 1 (no interleaving) to 5
bits/symbol. The ACM/VCM support allows
configuration changes of the FEC core on a block-
reby-block basis while streaming without any data
loss. In band signaling can control code and
pmodulation changes for applications that use
• Supported block sizes: 16K and 64K block sizes
• Packet Error Rate performance to 10E-7
• Auto Iterations to optimize code performance
• Full ACM and VCM compliance
OTHERS
• Available as ASIC core upon request
• JTAG (available in ASIC version of the core)
• LLR demapper optionally available with FEC
core.
• Available for both Altera and Xilinx FPGA
platforms
• 155 Mbit/sec data rate in an ASIC
EVALUATION TOOLS
• For free evaluation software, please contact AHA.
DELIVERABLES
• Altera, Xilinx, or ASIC synthesized netlist.
• Complete Documentation
(ACM/VCM) schemes.
• Bit accurate C models
Figure 1: Block Diagram
frame start
configuration
data
frame start
configuration
data
BCH block error
APPLICATIONS
• Broadcast TV, HDTV
• Satellite communications
• Microwave communications
• Cellular Backhaul
auto_iter
reset
clk
AHA4702
comtech aha corporation
The AHA LDPC core technology is covered under multiple patents pending.
*This Product Brief is for a product under development. Specifications and
availability are subject to change. Contact AHA for the latest information.




AHA

AHA4702 Datasheet Preview

AHA4702 Datasheet

DVB-S2 Compliant LDPC/BCH Forward Error Correction (FEC) Decoder Core

No Preview Available !

comtech aha corporation
Table 1: DVB-S2 Codes and Performance
Code Rate
Spectral Efficiency
(bits/symbol)
1/4 0.49
1/3 0.66
2/5 0.79
1/2 0.99
3/5 1.19
2/3 1.32
3/4 1.49
4/5 1.59
5/6 1.65
8/9 1.77
9/10 1.79
Ideal Es/No (dB)
(QEF)
-2.4
-1.2
-0.3
1.0
2.2
3.1
4.0
4.7
5.2
6.2
6.4
Eb/No
(dB)
0.6
0.6
0.7
1.0
1.4
1.9
2.2
2.7
3.0
3.7
3.8
In Table 1, configuration is 64K block size, QPSK modulation, and Quasi Error Free (QEF) on an AWGN
Channel. The 16K codes perform about 0.2 to 0.3 dB worse. In addition to QPSK performance this design
meets the performance data published in the DVB-S2 standard document for all of the other modulation
schemes.
ORDERING INFORMATION
ryPart Number
Description
preliminaAHA4702 DVB-S2 LDPC Decoder Core
ABOUT AHA
Comtech AHA Corporation (AHA) develops
and markets superior integrated circuits, boards,
and intellectual property core technology for
communications systems architects worldwide.
AHA has been setting the standard in Forward Error
Correction and Lossless Data Compression
technology for many years and provides flexible,
cost-effective solutions for today’s growing
bandwidth and reliability challenges. Comtech
AHA Corporation is a wholly owned subsidiary of
Comtech Telecommuncations Corp. (NASDAQ:
CMTL). For more information, visit www.aha.com
A subsidiary of Comtech Telecommunications Corporation
1126 Alturas Drive Moscow, ID 83843-8331
tel: 208.892.5600 fax: 208.892.5601
email: sales@aha.com www.aha.com
PB4702_1106
© 2006 Comtech AHA Corp.


Part Number AHA4702
Description DVB-S2 Compliant LDPC/BCH Forward Error Correction (FEC) Decoder Core
Maker AHA
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