Patent ID: 7340008

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 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; and mapping the stream of bits from the encoder to 3 bit positions representing each of the bits for 8PSK modulation, determined by s 0 ( i )= x (2 ·N+i ) s 1 ( i )= x (2 ·i ) s 2 ( i )= x (2 ·i+ 1) where x(i) indicates an i-th bit before mapping, s(i) indicates an i-th bit after mapping, s 0 (i), indicates a first bit among the i-th 3 bits representing each of the bits for 8-ary PSK modulation, s 1 (i) indicates a second bit among the i-th 3 bits representing each of the bits for 8-ary PSK modulation, s 2 (i) indicates a third bit among the i-th 3 bits representing each of the bits for 8-ary PSK modulation, and i indicates positions of the bits from 0 to (N−1).