  This paper proposes a polar code construction scheme that reduces
constituent-code supplemented decoding latency. Constituent codes are the
sub-codewords with specific patterns. They are used to accelerate the
successive cancellation decoding process of polar code without any performance
degradation. We modify the traditional construction approach to yield increased
number of desirable constituent codes that speeds the decoding process. For
(n,k) polar code, instead of directly setting the k best and (n-k) worst bits
to the information bits and frozen bits, respectively, we swap the locations of
some information and frozen bits carefully according to the qualities of their
equivalent channels. We conducted the simulation of 1024 and 2048 bits length
polar codes with multiple rates and analyzed the decoding latency for various
length codes. The numerical results show that the proposed construction scheme
generally is able to achieve at least around 20% latency deduction with an
negligible loss in gain with carefully selected optimization threshold.
