  Owing to their capacity-achieving performance and low encoding and decoding
complexity, polar codes have drawn much research interests recently. Successive
cancellation decoding (SCD) and belief propagation decoding (BPD) are two
common approaches for decoding polar codes. SCD is sequential in nature while
BPD can run in parallel. Thus BPD is more attractive for low latency
applications. However BPD has some performance degradation at higher SNR when
compared with SCD. Concatenating LDPC with Polar codes is one popular approach
to enhance the performance of BPD , where a short LDPC code is used as an outer
code and Polar code is used as an inner code. In this work we propose a new way
to construct concatenated LDPC-Polar code, which not only outperforms
conventional BPD and existing concatenated LDPC-Polar code but also shows a
performance improvement of 0.5 dB at higher SNR regime when compared with SCD.
