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Convolutional Turbo Code decoder (CTC)

K=4 (8 states).
Rate 1/3, other rates can be achieved with external puncturing.
Up to 10 Mbit/s at full 8 iterations with Altera Stratix FPGA family.
Sophisticated early termination mechanism to support power saving and higher statistical throughput.
Compliant with 3GPP (WCDMA 99).
Support LTE interleave function (optional).
Block length of 40-5114 (40-6144 for LTE).
All-synchronous design using a single clock, except for global asynchronous reset.
Simple processor interface for easy programming of configuration registers.
Available as verilog source code or as netlist.



Turbo code decoder general diagram


Implementation
The base decoder is Max Log MAP with LLR scaling. This decoder gives only -0.1 dB performance compared with MAP/log MAP decoders, but ~40% smaller.

Performance
Block size of 5114 bits, rate 1/3.

Ordering information

Turbo Code decoder available as verilog source code or as EDIF netlist for Xilinx/Altera FPGAs families.
Delivery includes:

Verilog source code or verilog EDIF netlist.
Extensive Verilog testing environment + stimuli generator.
Bit-exact Matlab model.
Detailed documentation.

For more information please contact us

 

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