Patent ID: 7130358

Claim:
A method for mapping a stream of bits output from an encoder to a stream of bits for 8PSK (8-ary Phase Shift Keying) modulation, comprising the steps of: dividing the stream of bits from the turbo encoder into a first period and a second period, wherein the first period includes bits with higher priority and the second period includes bits with lower priority, wherein the stream of bits output from the turbo encoder is comprised of N bits, N is a positive integer, the first period includes first to {(2/3)×N} th bits, and the second period includes {2/3)×N+1} th to N th bits; and sequentially mapping the bits in the first period to bit positions with higher reliability in a stream of rearranged bits, and mapping the bits in the second period to bit positions with lower reliability in the stream of rearranged bits, said stream of rearranged bits comprising segments of 3 consecutive bits representing the bit positions of each 8PSK modulation symbol.