US9270350B2ActiveUtilityA1
OFDM communication system, method and device for transceiving signal
Est. expiryDec 31, 2033(~7.5 yrs left)· nominal 20-yr term from priority
H04L 1/0606H04B 7/0456H04B 7/0632H04L 1/0668H04L 5/0007
36
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Cited by
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Claims
Abstract
An OFDM communication system, a method and a device for transceiving signal are provided. The method includes: 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. The data transmission performance can be improved.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
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 .
5. A signal receiving method for Orthogonal Frequency Division Multiplexing (OFDM) communication system, comprising:
dividing Q receiving antennas into S groups, wherein each group of receiving antennas corresponds to a receiving port, receiving antennas in different groups are uncorrelated, Q is greater than or equal to 2, and S is greater than or equal to 2; and
receiving signals transmitted by a signal transmitting method through each receiving port, and detaching modulation symbols of each data flow mapped to the resource element pair, wherein the signal transmitting method comprises: 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 detaching modulation symbols of each data flow mapped to the resource element pair comprises:
obtaining channel estimation values of pilot signals transmitted from the U transmitting ports and received at each receiving port;
forming a combined transmission equation based on the channel estimation values and the received modulation symbols mapped to the resource element pair; and
solving the combined transmission equation to detach each modulation symbol;
wherein U=4, and S=2;
wherein signals r pq the two receiving antennas received on the resource element pair are represented by:
r 11 =w 11 h 11 s 11 +w 12 h 12 s 21 +w 21 h 13 s 12 +w 22 h 14 s 22 ;
r 12 =w 11 h 11 s* 12 +w 12 h 12 s* 22 −w 21 h 13 s* 11 −w 22 h 14 s* 21 ;
r 21 =w 11 h 11 s 11 +w 12 h 22 s 21 +w 21 h 23 s 12 +w 22 h 24 s 22 ;
r 22 =w 11 h 21 s* 12 +w 12 h 22 s* 22 −w 21 h 23 s* 11 −w 22 h 24 s* 21 ;
wherein p=1, 2 represents receiving port number, and q=1, 2 represents resource element number;
wherein s 11 s 12 s 21 and s 22 are modulation symbols of each data flow mapped to the resource element pair, 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 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 ;
wherein {tilde over (h)} 11 , {tilde over (h)} 12 , {tilde over (h)} 13 , {tilde over (h)} 14 represent channel estimation values of pilot signals transmitted from the four transmitting ports and received at the first receiving antenna, where {tilde over (h)} 11 =W 11 h 11 , {tilde over (h)} 12 =W 12 h 12 , {tilde over (h)} 13 =W 21 h 13 , {tilde over (h)} 14 =W 22 h 14 ;
wherein {tilde over (h)} 21 , {tilde over (h)} 22 , {tilde over (h)} 23 , {tilde over (h)} 24 represent channel estimation values of pilot signals transmitted from the four transmitting ports and received at the second receiving antenna, where {tilde over (h)} 21 =W 11 h 21 , {tilde over (h)} 22 =W 12 h 22 , {tilde over (h)} 23 =W 21 h 23 , {tilde over (h)} 24 =W 22 h 24 ;
wherein W ij represents the transmission pre-coding weights or beam weights of the four transmitting ports, where i=1, 2 represents a transmitting port number of the j th data flow, j=1, 2 represents a sequence number of the data flow, h xy represents fading channels of signals transmitted from the four transmitting ports to the receiving ports, x=1, 2 corresponds to a receiving port number, and y=1, 2, 3, 4 corresponds to a transmitting port number; and
wherein the combined transmission equation is represented by:
[
r
11
r
12
*
r
21
r
22
*
]
=
[
h
~
11
h
~
13
h
~
12
h
~
14
-
h
~
13
*
h
~
11
*
-
h
~
14
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~
12
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h
~
21
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~
23
h
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22
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~
24
-
h
~
23
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h
~
21
*
-
h
~
24
*
h
~
22
*
]
[
s
11
s
12
s
21
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
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11
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~
13
h
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h
~
14
-
h
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13
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h
~
11
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]
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