POLAR Encoder Definition

POLAR encoder

Polar codes are based on this paper by Erdal Arikan "Channel Polarization: A Method for Constructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels", 2009 block holds common information for encoders and decoders.

Expects values with MSB first. It needs a full information word and encodes it in one pass. Output is a codeword of block_size.

Parameters

Packed Bits

Choose 1 active bit per byte or 8 active bit per byte. if false, VOLK polar encoder is used.

Parallelism

For parallel execution of multiple instances of the block (more info is needed on this)

Dimension 1

For parallelism

Dimension 2

For parallelism

Block size (N)

Codeword size. MUST be a power of 2.

#Info Bits (K)

Represents the number of information bits in a block. Also called frame_size. <= block_size

Frozen Bit Positions

Integer vector which defines the position of all frozen bits in a block. Its size MUST be equal to block_size - num_info_bits. Also it must be sorted and every position must only occur once.

Frozen Bit Values

Holds an unpacked byte for every frozen bit position. It defines if a frozen bit is fixed to '0' or '1'. Defaults to all ZERO.

Example Flowgraph

This flowgraph can be found at [1]

Source Files

C++ files

[2]

Common code

Public header files

[3]

Block definition

[4]