Method and system for rate-2 transmission

A system for transmitting at least one set of eight symbols, the system comprising:

• an encoding module to receive the at least one set of eight symbols from a set of symbols, the set of symbols being represented by a rotated constellation wherein each symbol from the set of symbols is represented in a different manner from each other symbol from the set of symbols, the encoding module further comprising:
• an interleaving module to interleave each symbol from the set of eight symbols with a corresponding combining symbol to obtain a set of eight interleaved symbols corresponding to the set of eight symbols, each interleaved symbol from the set of eight interleaved symbols comprises an information of the symbol and the corresponding combining symbol, the symbol and the corresponding combining symbol forming a part of the set of eight symbols;
• a transmitting module for transmitting a combination of a first four interleaved symbols from the set of eight interleaved symbols, a complex conjugate of the first four interleaved symbols and a negative complex conjugate of the first four interleaved symbols using the at least three transmit antennas wherein each transmit antenna transmits information of each interleaved symbol from the set of the eight interleaved symbols over two transmission channels, each transmission channel transmitting information of each interleaved symbol from the set of the eight interleaved symbols using the at least three transmit antennas;
• wherein the encoding module further comprises:
• a rotating module to rotate a constellation if a real or an imaginary part of one symbol of the constellation has a same real or an imaginary part of another symbol of the constellation to obtain a rotated constellation.

A method for transmitting a set of arranged symbols using at least three transmit antennas, the method comprising:

• generating a set of eight interleaved symbols corresponding to the set of eight symbols, each interleaved symbol from the set of eight interleaved symbols being created by combining a first part of one symbol with a second part of one other symbol, the symbol and the one other symbol forming part of the set of eight symbols;
• and
• generating the arranged symbols by arranging the set of eight interleaved symbols according to a matrix, the matrix having at least three rows and four columns, each row of the matrix corresponding to a transmitter antenna, wherein the matrix comprises:
• a first row with a combination of a first interleaved symbol and a negative complex conjugate of a second interleaved symbol from the set of eight interleaved symbols in a first two columns of the matrix, a third in interleaved symbol and a negative complex conjugate of a fourth interleaved symbol from the set of eight interleaved symbols in a last two columns of the matrix,
• a second row with a combination of a complex conjugate of the first interleaved symbol and the second interleaved symbol from the set of eight interleaved symbols in the first two columns of the matrix and a complex conjugate of the third interleaved symbol and the fourth interleaved symbol from the set of eight interleaved symbols in the last two columns of the matrix,
• a third row with a combination of a fifth interleaved symbol and a negative complex conjugate of a sixth interleaved symbol from the set of eight interleaved symbols in a first two columns of the matrix, a seventh interleaved symbol and a negative complex conjugate of an eighth interleaved symbol from the set of eight interleaved symbols in a last two columns of the matrix, the first two columns representing a first transmission channel and the last two columns representing a second transmission channel.

A method for transmitting a set of arranged symbols using at least three transmit antennas, the method comprising:

• generating a set of eight interleaved symbols corresponding to the set of eight symbols, each interleaved symbol from the set of eight interleaved symbols being created by combining a first part of one symbol with a second part of one other symbol, the symbol and the one other symbol forming part of the set of eight symbols;
• and
• generating the arranged symbols by arranging the set of eight interleaved symbols according to a matrix, the matrix having at least three rows and four columns, each row of the matrix corresponding to a transmitter antenna, wherein the matrix comprises:
• a first row with a combination of a first interleaved symbol and a negative complex conjugate of a second interleaved symbol from the set of eight interleaved symbols in a first two columns of the matrix, a third interleaved symbol and a negative complex conjugate of a fourth interleaved symbol from the set of eight interleaved symbols in a last two columns of the matrix,
• a second row with a combination of a complex conjugate of the first interleaved symbol and the second interleaved symbol from the set of eight interleaved symbols in the first two columns of the matrix and a complex conjugate of the third interleaved symbol and the fourth interleaved symbol from the set of eight interleaved symbols in the last two columns of the matrix,
• a third row with a combination of a fifth interleaved symbol and a sixth interleaved symbol from the set of eight interleaved symbols in a first two columns of the matrix, a seventh interleaved symbol and an eighth interleaved symbol from the set of eight interleaved symbols in a last two columns of the matrix, the first two columns representing a first transmission channel and the last two columns representing a second transmission channel.