Viterbi Decoder
Features
- Soft decision decoder
- High-speed applications, typically 45 millions of samples per second (MSPS) on continuous data stream
- Compatible with other Amphion forward error correction (FEC) megafunctions
- Dynamic support of
R = 1/2 and R = 3/4
- May be configured in terms of constraint length
K, rate R, soft or hard decision
- Simple interface allows easy integration into larger systems
Block Diagram
Figure 1 shows the block diagram for the Viterbi Decoder megafunction.
| Figure 1. Block Diagram |
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Description
The Amphion Viterbi decoder megafunction is a high-performance implementation suitable for a range of FEC applications. The megafunction may be used in conjunction with other FEC-related megafunctions available from Amphion to rapidly construct complete FEC solutions.
The megafunction has been developed in HDL and has been tailored specifically for Altera APEX™ and FLEX® architectures to obtain compact, high-performance implementations.
The basic megafunction assumes only the provision of a symbol rate clock. If a higher rate clock is available in the system, some of the hardware may be reused multiple times per data symbol period, reducing the overall hardware requirements. If the latency of the first sample is approximately 960 Clk x 4 cycles, a continuous data stream could typically be processed at 47 MSPS.
The Amphion Viterbi decoder megafunction can be rapidly configured for a wide range of specifications. The megafunctions have been developed using hardware description languages (HDLs), in a modular and parameterizable fashion. This design gives Amphion the capability to quickly configure a specific implementation to a user's specification by adding specific modules, such as the interleaver/deinterleaver and scrambler/descrambler.
Device Utilization Example
Table 1 lists the typical device utilization results for the megafunction.
| Table 1. Typical Device Utilization for the Megafunction |
| Device |
Speed Grade |
Utilization |
Performance(fMAX) |
Parameter Setting |
| Logic Cells |
EABs (1) |
| EPF10K200E |
-1 |
2,846 |
4 |
19.5 ns,
51.28 MHz |
K=7, R=1/2, soft decision decoder |
Note:
- EABs = Embedded array blocks
Contact Information
For additional information, you can contact Amphion Semiconductor, Ltd. at:
Amphion Semiconductor, Ltd.
51 Malone Road
Belfast, BT9 6RY
Northern Ireland
Tel. +44 28 9050-4000
Fax +44 28 9050-4001
Email: info@amphion.com
URL: http://www.amphion.com
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