Block Viterbi Decoder

Viterbi decoding is an efficient algorithm for decoding convolutionally encoded sequences corrupted by channel noise back to the original sequence. In the digital transmit-receive system shown below the digital data stream (e.g., voice, image, or any packetized data) is encoded, modulated, and transmitted through a wired or wireless channel. A “noise” block connected to the channel symbolically denotes the channel noise. The data received from the channel at the receiver side is first demodulated and then decoded using the Viterbi decoder. The decoded output is equivalent to the transmitted digital data stream.

Lattice's Block Viterbi Decoder IP core is a parameterizable Viterbi Decoder for decoding different combinations of convolutionally encoded sequences. The decoder supports various code rates, constraint lengths, and generator polynomials. It also allows soft-decision decoding and is capable of decoding punctured codes. The core can operate in continuous or block modes, whichever is required by the channel. Either Tail Biting or Zero Flushing convolutional codes can be decoded in the block mode. All the configurable parameters, including operation mode, generator polynomials, punctured block size, and puncture pattern can be defined by the user to suit the needs of their application. The code rate and puncture pattern can also be changed dynamically through input ports during the operation of the decoder. Lattice’s Block Viterbi Decoder IP is compatible with many networking and wireless standards that use different methods of convolutional encoding at the encoder.

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