Patent ID: 8532208

Claim:
A transmission apparatus that transmits, to a reception apparatus, a transmission bit string, the transmission apparatus comprising: an obtainment unit that obtains, for each transmission to the reception apparatus, information on a per-bit transmission of the transmission bit string; a controller that controls a per-bit transmission condition for a current transmission bit string such that a per-bit transmission quality of the transmission bit string approaches evenly based on cumulative information on the transmissions up to a last transmission obtained by the obtainment unit; and a multi-level modulator that sends the current transmission bit string to the reception apparatus by mapping the current transmission bit string to a transmission symbol of multi-level modulation, wherein the obtainment unit comprises a per-bit transmission count counting section that counts a per-bit transmission count as the information on the per-bit transmission, wherein the controller comprises a symbol mapping controller that controls the multi-level modulator based on the per-bit transmission condition, wherein the multi-level modulator maps a first bit to a first bit position and a second bit to a second bit position, wherein a transmission count of the first bit, which counted up to the last transmission by the per-bit transmission count counting section, is higher than a transmission count of the second bit, wherein the first bit position has an error resilience which is lower than an error resilience of the second bit position, and wherein the first bit and the second bit are included in the current transmission bit string, and the first bit position and the second bit position are included in the transmission symbol of the multi-level modulation.