| Περίληψη: | Polar codes have been included in channel coding, along with LDPC
codes, for 5G New Radio communication systems, in order to achieve lower
power consumption and high performance results. Polar coding is used
for control information because of the exceptional correction ability when
small codewords are applied. In order to do so, external modes need to
be applied in the encoding- decoding chain. Three interleaves are used.
CRC interleaver cuts short decoding paths when an uncorrectable error has
been detected, Sub-block interleaver and channel interleaver are used in
order to improve the error correction performance of the decoder. Three
rate matching procedures are used in order to achieve the required data
rate, those are puncturing, shortening and repetition. More mechanisms are
decided by the standard to be included in decoding chain and they would
be studied in extent in this thesis.
Due to variations in uplink and downlink control information’s re-
quirements and external modes, predefined by 3GPP, different algorithms
and architectures will be considered. Successive Cancellation (SC), Successive
Cancellation List (SCL), CRC Aided Successive Cancellation List (CA-SCL),
Distributed CRC Aided Successive Cancellation List (DCA-SCL) are the al-
gorithms mentioned in the standard of 3GPP, but not strictly so we may
consider some other algorithms such as Successive Cancellation Flip (SCF)
in order to achieve low complexity and high performance. The trade-offs be-
tween complexity and error correction will be studied in any case described
by the standard and after the evaluation of various decoding algorithms,
there will be the hardware implementations adjusting to the requirements
of the standard.
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