Patent ID: 9215027
Filing Date: 2015-12-15
Classification: H04B,H04J

Abstract:
1. A transmission apparatus for transmitting a block of data over a plurality of transmission channels, the transmission apparatus comprising: a modulator operable to generate one of a plurality of rotated constellation points in accordance with the block of data to be transmitted, each of the plurality of rotated constellation points having N components; a mapper operable to separate and map each of the N components of the generated rotated constellation point to a different one of a plurality of complex symbols; and a transmitter operable to transmit each of the complex symbols at a different time and/or at a different frequency, wherein the plurality of rotated constellation points are obtained by applying an orthogonal transformation to each of a plurality of initial constellation points having N components so as to increase a reception robustness under fading conditions, N is a multiple of four, the orthogonal transformation has one of (i) an N-by-N matrix representation with absolute values of all elements on a main diagonal equal to a first value, and with absolute values of all elements not on the main diagonal equal to a non-zero second value, and (ii) a matrix representation obtained by permuting rows and/or columns in an N-by-N matrix representation with absolute values of all elements on a main diagonal equal to a first value, and with absolute values of all elements not on the main diagonal equal to a non-zero second value, and when each of the N-by-N matrix representations is denoted by R, a and b denote real parameters, each sign value s the real parameters a and b satisfy