  The performance of a Turbo code with short block length depends critically on
the interleaver design. There are two major criteria in the design of an
interleaver: the distance spectrum of the code and the correlation between the
information input data and the soft output of each decoder corresponding to its
parity bits. This paper describes a new interleaver design for Turbo codes with
short block length based on these two criteria. A deterministic interleaver
suitable for Turbo codes is also described. Simulation results compare the new
interleaver design to different existing interleavers.
