Patent ID: 7281189

Claim:
A transmission apparatus comprising: an encoding section that turbo-encodes transmission data and outputs systematic bit data and parity bit data; a first control section that sets a first threshold, and when reception quality is equal to or better than the first threshold, sets a modulation scheme of a greater M-ary modulation level for the parity bit data than when reception quality is less than the first threshold; and a second control section that sets a second threshold, said second threshold being greater than the first threshold, and, when reception quality is equal to or better than the second threshold, sets a modulation scheme of a greater M-ary modulation level for the parity systematic bit data than when reception quality is less than the second threshold; a modulation section that modulates the systematic bit data and the parity bit data independently of each other using the respective modulation schemes set in the first control section and the second control section; and a transmission section that transmits the systematic bit data and the parity bit data modulated by the modulation section.