OFDM communication system, method and device for transceiving signal

1. A signal transmitting method for Orthogonal Frequency Division Multiplexing (OFDM) communication system, comprising: dividing M transmitting antennas into one or more groups to form U transmitting ports, wherein transmitting antennas in different groups are uncorrelated, and M is greater than or equal to U; forming P data flows using a Multiple-Input Multiple-Output (MIMO) mode, wherein P=U/2, and P is less than or equal to a number of receiving ports; and mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports, wherein the one or more groups of transmitting antennas formed by dividing the M transmitting antennas constitute diversity antennas, one group or more than one group of antenna arrays; wherein each group of transmitting antennas constitutes an antenna array, and forms one or more transmitting ports based on one or more pre-coding weights or one or more beam weights, where the number of the pre-coding weights or the number of the beam weights is equal to the number of the transmitting ports; wherein U=4, P=2, the M transmitting antennas are divided into four groups, and the four groups of transmitting antennas constitute diversity antennas; and wherein mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports comprise: a first group of transmitting antennas transmitting, in a single antenna mode or a single port mode, a modulation symbol s 11 on a first resource element and a modulation symbol s* 12 on a second resource element; a second group of transmitting antennas transmitting, in a single antenna mode or a single port mode, a modulation symbol s 21 on a first resource element and a modulation symbol s* 22 on a second resource element; a third group of transmitting antennas transmitting, in a single antenna mode or a single port mode, a modulation symbol s 12 on the first resource element and a modulation symbol −s* 11 on the second resource element; and a fourth group of transmitting antennas transmitting, in a single antenna mode or a single port mode, a modulation symbol s 22 on the first resource element and a modulation symbol −s* 21 on the second resource element, wherein the first resource element and the second resource element are two resource elements of the resource element pair, the modulation symbols s 11 and s 12 are data of a first data flow, the modulation symbol −s* 11 is a negative conjugated form of the modulation symbol s 11 , the modulation symbol s* 12 is a conjugated form of the modulation symbol s 12 , the modulation symbols s 21 and s 22 are data of a second data flow, the modulation symbol −s* 21 is a negative conjugated form of the modulation symbol s 21 , and the modulation symbol s* 22 is a conjugated form of the modulation symbol s 22 .

2. The signal transmitting method according to claim 1 , wherein if any group of transmitting antennas comprises more than one transmitting antennas, the transmitting antennas in that group form a single port based on one group of pre-coding weights or beam weights and transmit in an antenna array mode.

3. A signal transmitting method for Orthogonal Frequency Division Multiplexing (OFDM) communication system, comprising: dividing M transmitting antennas into one or more groups to form U transmitting ports, wherein transmitting antennas in different groups are uncorrelated, and M is greater than or equal to U; forming P data flows using a Multiple-Input Multiple-Output (MIMO) mode, wherein P=U/2, and P is less than or equal to a number of receiving ports; and mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports, wherein the one or more groups of transmitting antennas formed by dividing the M transmitting antennas constitute diversity antennas, one group or more than one group of antenna arrays; wherein each group of transmitting antennas constitutes an antenna array, and forms one or more transmitting ports based on one or more pre-coding weights or one or more beam weights, where the number of the pre-coding weights or the number of the beam weights is equal to the number of the transmitting ports; wherein U=4, P=2, the M transmitting antennas are divided into two groups to form antenna arrays respectively, and each group of transmitting antennas uses two groups of pre-coding weights or beam weights to form two transmitting ports; and wherein mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports comprise: the first group of transmitting antennas using a first transmitting port thereof to transmit a modulation symbol s 11 on a first resource element, and transmit a modulation symbol s* 12 on a second resource element, and the first group of transmitting antennas using a second transmitting port thereof to transmit a modulation symbol s 21 on the first resource element, and transmit a modulation symbol s* 22 on the second resource element; and the second group of transmitting antennas using a first transmitting port thereof to transmit a modulation symbol s 12 on the first resource element, and transmit the modulation symbol −s* 11 on the second resource element, and the second group of transmitting antennas using a second transmitting port thereof to transmit a modulation symbol s 22 on the first resource element, and transmit a modulation symbol −s* 21 on the second resource element, wherein the first resource element and the second resource element are two resource elements of the resource element pair, the modulation symbols s 11 and s 12 are data of a first data flow, the modulation symbol −s* 11 is a negative conjugated form of the modulation symbol s 11 , the modulation symbol s* 12 is a conjugated form of the modulation symbol s 12 , the modulation symbols s 21 and s 22 are data of a second data flow, the modulation symbol −s* 21 is a negative conjugated form of the modulation symbol s 21 , and the modulation symbol s* 22 is a conjugated form of the modulation symbol s 22 .

4. A signal transmitting method for Orthogonal Frequency Division Multiplexing (OFDM) communication system, comprising: dividing M transmitting antennas into one or more groups to form U transmitting ports, wherein transmitting antennas in different groups are uncorrelated, and M is greater than or equal to U; forming P data flows using a Multiple-Input Multiple-Output (MIMO) mode, wherein P=U/2, and P is less than or equal to a number of receiving ports; and mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports, wherein the one or more groups of transmitting antennas formed by dividing the M transmitting antennas constitute diversity antennas, one group or more than one group of antenna arrays; wherein each group of transmitting antennas constitutes an antenna array, and forms one or more transmitting ports based on one or more pre-coding weights or one or more beam weights, where the number of the pre-coding weights or the number of the beam weights is equal to the number of the transmitting ports; wherein U=4, P=2, the M transmitting antennas are divided to form one group of transmitting antennas which constitute an antenna array, and the antenna array forms four transmitting ports based on four groups of pre-coding weights or beam weights; and wherein mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports comprise: a first transmitting port transmitting a modulation symbol s 11 on a first resource element, and transmitting a modulation symbol s* 12 on a second resource element; a second transmitting port transmitting a modulation symbol s 21 on the first resource element, and transmitting a modulation symbol s* 22 on the second resource element; a third transmitting port transmitting a modulation symbol s 12 on the first resource element, and transmitting a modulation symbol −s* 11 on the second resource element; and a fourth transmitting port transmitting a modulation symbol s 22 on the first resource element, and transmitting a modulation symbol −s* 21 on the second resource element, wherein the first resource element and the second resource element are two resource elements of the resource element pair, the modulation symbols s 11 and s 12 are data of a first data flow, the modulation symbol −s* 11 is a negative conjugated form of the modulation symbol s 11 , the modulation symbol s* 12 is a conjugated form of the modulation symbol s 12 , the modulation symbols s 21 and s 22 are data of a second data flow, the modulation symbol −s* 21 is a negative conjugated form of the modulation symbol s 21 , and the modulation symbol s* 22 is a conjugated form of the modulation symbol s 22 .

6. The signal receiving method according to claim 5 , wherein a Minimum Mean Square Error (MMSE) estimation method is used to solve the combined transmission equation through an equation shown below, so as to obtain each modulation symbol: [ s ^ 11 s ^ 12 s ^ 21 s ^ 22 ] = ( H H ⁢ H + R n ) - 1 ⁢ H H ⁡ [ r 11 r 12 * r 21 r 22 * ] ; where ŝ 11 ŝ 12 ŝ 21 and ŝ 22 represent resolved modulation symbols, R n is a matrix related to noise estimation, and H = [ h ~ 11 h ~ 13 h ~ 12 h ~ 14 - h ~ 13 * h ~ 11 * - h ~ 14 * h ~ 12 * h ~ 21 h ~ 23 h ~ 22 h ~ 24 - h ~ 23 * h ~ 21 * - h ~ 24 * h ~ 22 * ] .