FIELD: radio engineering, communication.
SUBSTANCE: invention relates to methods of transmitting and receiving data and devices for modulating and demodulating data. By using signal points with a circular arrangement, obtained by rearranging part of signal points arranged in a rectangular form or cruciform, the average signal power and peak signal energy are lowered to improve nonlinear distortion characteristics. Provided is a bit mapping method, wherein the average Hamming distance in indicators of the preassigned portion from less significant bits between neighbouring signal points is low, and the Euclidean distance between signal points, in which portions of less significant bits assigned thereto match, becomes maximum. By applying an error correction code to only the portion of less significant bits, a data transmission method is provided, which is superior on bit error rate characteristics, along with moderation of the bandwidth expansion ratio.
EFFECT: achieving a solution which is superior on nonlinear distortion characteristics.
40 cl, 39 dwg, 1 tbl
