Patent ID: 8494081
Filing Date: 2013-07-23
Classification: H04L

Abstract:
1. A transmission device to transmit data in which 2^n level amplitude modulation has been applied, wherein n is an integer greater than or equal to two, the transmission device comprising: a separation unit configured to separate a piece of data for transmission into n data sequences; a conversion unit configured to convert a data sequence from among the n data sequences by applying encoding processing to the data sequence so that a same value is continuous no more than a predetermined number of times; an inversion control unit configured (i) to determine whether a new cumulative value approaches a standard value, the new cumulative value being calculated from (a) a cumulative value of amplitude disparities for one or more pieces of data transmitted up until a present time and (b) a total sum of disparities of a plurality of n-bit symbols of candidate data that includes the converted data sequence and related remaining n−1 data sequences of the n data sequences, and (ii) to obtain an intermediate data sequence from a specific data sequence by inverting the specific data sequence when the determination is negative and not inverting the specific data sequence when the determination is positive, the specific data sequence being a data sequence from among the converted data sequence and the remaining n−1 data sequences and comprising a most significant bit of each symbol; and a modulation unit configured to perform 2^n level amplitude modulation on n-bit symbols, each of the n-bit symbols having a bit in the intermediate data sequence as a most significant bit and corresponding bits in the converted data sequence and the remaining n−1 data sequences, excluding the specific data sequence, as subsequent bits.