Source: https://patents.google.com/patent/US8542776B2/en
Timestamp: 2019-08-22 05:52:33
Document Index: 286034733

Matched Legal Cases: ['§119', 'Application No. 60', '§119', 'Application No. 2007', 'Application No. 200710305139', 'Application No. 10', 'Application No. 2007']

US8542776B2 - Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same - Google Patents
Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same Download PDF
US8542776B2
US8542776B2 US13/348,266 US201213348266A US8542776B2 US 8542776 B2 US8542776 B2 US 8542776B2 US 201213348266 A US201213348266 A US 201213348266A US 8542776 B2 US8542776 B2 US 8542776B2
US13/348,266
US20120170674A1 (en
2006-08-31 Priority to US84124606P priority Critical
2007-07-20 Priority to KR1020070073155A priority patent/KR20080021494A/en
2007-07-20 Priority to KR200773155 priority
2007-07-20 Priority to KR2007/73155 priority
2007-08-31 Priority to US11/896,479 priority patent/US8111782B2/en
2012-01-11 Priority to US13/348,266 priority patent/US8542776B2/en
2012-07-05 Publication of US20120170674A1 publication Critical patent/US20120170674A1/en
2013-09-24 Publication of US8542776B2 publication Critical patent/US8542776B2/en
A closed-loop multi-antenna system and method thereof are provided. A transmitter includes a feedback information processor and a first transmit unit. A receiver includes a channel estimator, a feedback information generator and a second transmit unit. The feedback information processor receives feedback information from the receiver, calculates each of a sum rate in a multi-user mode and a sum rate in a single-user mode using the feedback information, and selects one of the single-user mode and the multi-user mode as a transmission mode depending on a comparison result between the sum rate in the multi-user mode and the sum rate in the single-user mode. The channel estimator acquires channel quality information (CQI) for each data stream transmitted individually via each antenna group. The feedback information generator determines the CQI associated information from the CQI acquired individually for each antenna group corresponding to the transmission mode.
This application is a Continuation of U.S. patent application Ser. No. 11/896,479, which claims priority under 35 U.S.C. §119(e) of U.S. Patent Provisional Application No. 60/841,246, filed Aug. 31, 2006, in the United States Patent and Trademark Office, and claims the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 2007-73155, filed Jul. 20, 2007, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference.
In accordance with an aspect, a method for receiving/transmitting data in a closed-loop multi-antenna system defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups. The method includes receiving, by a transmitter, feedback information from at least one receiver, and calculating, by the transmitter, each of a sum rate (R_MU) in a multi-user mode and a sum rate (R_SU) in a single-user mode using the feedback information. The method also includes selecting, by the transmitter, one of the single-user mode and the multi-user mode as a transmission mode using a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode, and transmitting, by the transmitter, a data stream according to the selected transmission mode. The method also includes, acquiring, by the at least one receiver, channel quality information (CQI) for each data stream transmitted individually via each antenna group corresponding to the transmission mode. The method includes determining, by the at least one receiver, CQI associated information from the CQI acquired individually for each antenna group, and transmitting, by the at least one receiver, the determined CQI associated information to the transmitter as the feedback information. The CQI associated information includes maximum CQI, an antenna group index associated with the maximum CQI, rank information, and remaining CQI associated the rank information.
In accordance with another aspect, a closed-loop multi-antenna system defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups. The closed-loop multi-antenna system includes a transmitter including a feedback information processor and a first transmit unit, and at least one receiver including a channel estimator, a feedback information generator and a second transmit unit. The feedback information processor for receiving feedback information from the at least one receiver, calculating each of a sum rate (R_MU) in a multi-user mode and a sum rate (R_SU) in a single-user mode using the feedback information, and selecting one of the single-user mode and the multi-user mode as a transmission mode depending on a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode. The first transmit unit for transmitting a data stream according to the selected transmission mode. The channel estimator for acquiring, CQI for each data stream transmitted individually via each antenna group. The feedback information generator for determining, CQI associated information from the CQI acquired individually for each antenna group corresponding to the transmission mode, and the second transmit unit for transmitting the feedback information to the transmitter. The CQI associated information includes maximum CQI, an antenna group index associated with the maximum CQI, rank information, and remaining CQI associated the rank information.
Referring to FIG. 1, the transmission apparatus 110 includes Nt antennas, and the reception apparatus 120-1 includes Nr antennas. The Nt antennas included in the transmission apparatus 110 are grouped by a predetermined number of antennas. This is called ‘antenna grouping’, and an antenna bundle obtained by the grouping is called an ‘antenna group’. However, a multi-antenna system using a precoding matrix can apply grouping for columns, and grouping for beams. In this case, the present invention can be implemented by means of “column group” or “beam group” rather than the “antenna group”. Therefore, the “antenna group” as used herein should be construed to include the “column group” and the “beam group”. For convenience, the number of antenna groups herein is assumed to be 2. Therefore, each antenna group is composed of Nt/2 antennas.
To this end, the reception apparatus 120-1 includes at least one reception antenna Ant_rx #1, Ant_rx #2, . . . , Ant_rx #Nr, a channel estimator 122-1, and a feedback information generator 124-1. The transmission apparatus 110 includes multiple transmission antennas (Ant_tx #1, Ant_tx #2, . . . , Ant_tx #Nt), a feedback information processor 114, and a data transmitter 112.
In addition, the channel estimator & feedback information generator 210 generates feedback information based on the ESN (where j is a data stream group index or an antenna group index) acquired separately for each data stream group. The feedback information includes a maximum ESN (MAX-ESN), an antenna group index (MAX group index) associated with the MAX-ESN, rank information (RANK), and a Remain ESN (Remain-ESN) associated with the rank information. The MAX-ESN is the best ESN among the ESNs acquired separately for each data stream group, and the MAX group index is an antenna group index (i.e. data stream group index) of the MAX-ESN. In addition, the rank information, indicative of the number of data streams (i.e. the number of data stream groups) transmitted by the transmitting entity via an antenna group, is information used for determining a transmission mode of the transmitting entity. The Remain-ESN can be acquired by means of a signal detection technique designated individually for each rank information.
Further, the channel estimator & feedback information generator 210 determines one of the SIC-ESNn and the OFF-ESNn as a Remain-ESN. For example, the channel estimator & feedback information generator 210 determines, as a Remain-ESN, an ESN capable of obtaining a higher rate among a rate (RSIC) calculated depending on the SIC-ESNn and a rate (ROFF) calculated depending on the OFF-ESNn. The channel estimator & feedback information generator 210 further considers the MAX-ESN for calculation of the RSIC. The channel estimator & feedback information generator 210 determines, as rank information, a rank value associated with the signal detection technique used for acquiring the ESN determined as the Remain-ESN.
In step 312, the reception apparatus calculates an MMSE-ESNj of each antenna group by means of the MMSE technique based on the estimated channel characteristic H. In step 314, the reception apparatus selects, as a MAX-ESN, the best MMSE-ESN from among the MMSE-ESN calculated for each antenna group, and selects, as a MAX group index, an antenna group index associated with the selected MAX-ESN.
f r ⁡ ( ρ g , 1 ) = ∑ m = 1 N T / 2 ⁢ f r ⁡ ( ρ m ) ( 1 ) f r ⁡ ( ρ g , 2 ) = ∑ m = ( N T / 2 ) + 1 N T ⁢ f r ⁡ ( ρ m ) ( 2 )
ρ m = h m H ( ∑ l ≠ m ⁢ h l ⁢ h l H + 4 S ⁢ ⁢ N ⁢ ⁢ R ⁢ I ) ⁢ h m ( 3 )
antenna group index calculated ESN
Group 1 MMSE-ESN1
Group 2 MMSE-ESN2
MAX-ESN MMSE-ESN1
MAX group index 1
MAX-ESN MMSE-ESN2
MAX group index 2
In step 422, the reception apparatus calculates an SIC-ESN1 and an OFF-ESN2, and sets them to SIC-ESN and OFF-ESN, respectively. To calculate the SIC-ESN, the reception apparatus should first detect the data stream transmitted by the second antenna group (an antenna group corresponding to the MAX group index). The reason is because the MMSE-ESN2 is set to MAX-ESN. Further, the reception apparatus acquires an ESN (SIC-ESN1) associated with the data stream transmitted by the first antenna group from the received signal from which the data stream component transmitted by the second antenna group is removed. To acquire the OFF-ESN2, the reception apparatus turns off the antennas belonging to the first antenna group, and acquires an ESN (OFF-ESN2) associated with the data stream transmitted by the second antenna group.
ρ g , min Remain = { ρ g , I g , min BF , if ⁢ ⁢ r = 1 ρ g , I g , max SIC , if ⁢ ⁢ r = 2 ( 4 )
where I=g,min=arg min{ρg,1,ρg,2}, and ρg,min Remain denotes a Remain-ESN.
The ρg,m BF calculated by Equation (4) is an SINR received by means of the beam-forming (BF) technique, and can be expressed as Equation (5) for m=1 and 2.
f r ⁡ ( ρ g , m BF ) = ∑ l = 2 ⁢ m - 1 2 ⁢ m ⁢ f r ⁡ ( ρ l BF ) ( 5 )
ρ m BF = h m H ( ∑ l ≠ m , l ∈ A l ⁢ h l ⁢ h l H + 2 S ⁢ ⁢ N ⁢ ⁢ R ⁢ I ) ⁢ h m ( 6 )
A l = { 2 ⁡ [ l + 1 2 ] - 1 , 2 ⁡ [ l + 1 2 ] } .
f t ⁡ ( ρ g , m GSIC ) = ∑ l = 2 ⁢ m - 1 2 ⁢ m ⁢ f r ⁡ ( ρ l GSIC ) ( 7 )
ρ m GSIC = h m H ( ∑ l ≠ m , l ∈ A i ⁢ h l ⁢ h l H + 4 S ⁢ ⁢ N ⁢ ⁢ R ⁢ I ) ⁢ h m ( 8 )
After acquiring the SIC-ESN and the OFF-ESN in step 418 and/or step 422, the reception apparatus proceeds to step 424 where it calculates a rate RSIC that it can obtain when applying the SIC technique, and a rate ROFF that it can obtain when applying the beam-forming technique. The RSIC and the ROFF can be calculated by Equation (9).
R BF=ƒr(ρg,I g,max BF)
R GSIC=ƒr(ρg,I g,max )+ƒr(ρg,I g,min GSIC) (9)
MAX-ESNi indexi RANKi Remain-ESNi
USER 1 MAX-ESN1 2 1 Remain-ESN1
USER 2 MAX-ESN2 1 2 Remain-ESN2
USER 3 MAX-ESN3 2 1 Remain-ESN3
In step 612, the transmission apparatus collects a MAX-ESNi using a MAX group indexi based on the feedback information received from each user. That is, the transmission apparatus collects the MAX-ESNi separately for each user (or reception apparatus) taking the MAX group indexi into account.
GROUP 1 — MAX-ESN2,1 —
GROUP 2 MAX-ESN1,2 — MAX-ESN3,2
m_best 2 1 2
USER 1 USER 2 USER 3 Maximum
GROUP 1 — MAX- — MAX-ESN2,1
ESN2,1
GROUP 2 MAX-ESN1,2 — MAX-ESN3,2 MAX-ESN1,2
M_best 2 1 2 R_MU
(RANK = 1) (RANK = 2) (RANK = 1)
GROUP 1 OFF MAX-ESN2,1 Remain-ESN3,1
GROUP 2 Remain-ESN1,2 Remain-ESN2,2 OFF
SUM RATE R_SU_1 R_SU_2 R_SU_3
(RANK = 1) (RANK = 2) (RANK = 1) Maximum
GROUP 1 OFF MAX-ESN2,1 Remain-ESN3,1 Remain-
ESN3,1
GROUP 2 Remain-ESN1,2 Remain-ESN2,2 OFF OFF
SUM R_SU_1 R_SU_2 R_SU_3 R_SU =
RATE R_SU_3
1. A method for receiving/transmitting data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the method comprising:
receiving, by a transmitter, feedback information from a receiver;
calculating, by the transmitter, each of a sum rate (R_MU) in a multi-user mode and a sum rate (R_SU) in a single-user mode using the feedback information;
selecting, by the transmitter, the single-user mode or the multi-user mode as a transmission mode using a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode; and
transmitting, by the transmitter, a data stream according to the selected transmission mode;
acquiring, by the receiver, channel quality information (CQI) for each data stream transmitted individually via each antenna group corresponding to the selected transmission mode;
determining, by the receiver, the CQI associated information from the CQI acquired individually for each antenna group; and
transmitting, by the receiver, the determined CQI associated information to the transmitter as the feedback information,
wherein the CQI associated information includes maximum CQI, an antenna group index associated with the maximum CQI, rank information, and remaining CQI associated the rank information.
2. The method of claim 1, wherein the calculating of the sum rate (R_MU) in the multi-user mode comprises:
collecting, by the transmitter, the maximum CQI for each antenna group using the antenna index;
selecting, by the transmitter, the maximum CQI for each antenna group from the maximum CQI collected for each antenna group; and
calculating, by the transmitter, the sum rate (R_MU) in the multi-user mode depending on a sum of the maximum CQI selected individually for each antenna group.
3. The method of claim 2, wherein the calculating of a sum rate (R_SU) in a single-user mode comprises:
collecting, by the transmitter, the CQI associated with each antenna group taking into account the rank information individually for the at least receiver;
calculating, by the transmitter, a sum rate individually for the receiver using the CQI collected for each antenna group; and
determining, by the transmitter, as the sum rate (R_SU) in the single-user mode, a greatest sum rate among the sum rates calculated individually for the receiver.
4. The method of claim 3, wherein the CQI collected for each antenna group is one of the maximum CQI, and the remaining CQI included in feedback information received from the at least receiver.
5. The method of claim 4, wherein the selecting of the transmission mode comprises:
selecting, by the transmitter, the multi-user mode as the transmission mode if the sum rate (R_SU) in the single-user mode is less than or equal to the sum rate (R_MU) in the multi-user mode; and
selecting, by the transmitter, the single-user mode as the transmission mode if the sum rate (R_SU) in the single-user mode is greater than the sum rate (R_MU) in the multi-user mode.
6. The method of claim 1, wherein the acquiring of the CQI comprises:
estimating, by the receiver, a channel characteristic associated with each data stream transmitted individually via each antenna group through channel estimation on a received signal; and
acquiring, by the receiver, the CQI associated with each data stream transmitted individually via each antenna group using the estimated channel characteristic.
7. The method of claim 6, wherein the determining of the maximum CQI comprises:
calculating, by the receiver, the CQI for each data stream transmitted individually via each antenna group using the estimated channel characteristic using a first signal detection technique; and
comparing, by the at least one receiver, the CQI calculated individually for each data stream and determining a best CQI as the maximum CQI.
8. The method of claim 7, wherein the determining of the CQI associated information comprises:
calculating, by the receiver, the CQI for a data stream transmitted via one of the antenna groups using the estimated channel characteristic using a second signal detection technique;
calculating, by the receiver, the CQI for a data stream transmitted via one of the antenna groups using the estimated channel characteristic using a third signal detection technique; and
determining, by the receiver, the rank information depending on the CQI calculated using the second signal detection technique and the CQI calculated using the third signal detection technique.
9. The method of claim 8, wherein the first signal detection technique is a linear detection technique, the second signal detection technique is a nonlinear detection technique and the third signal detection technique is a technique of turning-off remaining antenna groups, except for one antenna group among the antenna groups, and performing channel estimation on a data stream transmitted via the one antenna group, or the first signal detection technique is a Minimum Mean Square Error (MMSE) technique, the second signal detection technique is a Successive Interference Cancellation (SIC) technique, and the third signal detection technique is a beam-forming technique.
10. The method of claim 9, wherein the determining of the CQI associated information comprises:
calculating, by the at least one receiver, a first rate using the maximum CQI and an Effective Signal-to-Noise Ratio (ESN) calculated by the SIC technique;
calculating, by the receiver, a second rate using the ESN calculated by the beam-forming technique;
comparing, by the receiver, the first rate with the second rate;
if the first rate is less than or equal to the second rate, determining, by the at least one receiver, the rank information as a value for requesting transmission of multiple data streams via the antenna group, and determining, by the receiver, the remaining channel quality information as the ESN calculated by the SIC technique, and
if the first rate is greater than the second rate, determining the rank information as a value for requesting transmission of one data stream via the antenna group, and determining the remaining channel quality information as the ESN calculated by the beam-forming technique.
11. A closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the closed-loop multi-antenna system comprising:
a transmitter comprising a feedback information processor and a first transmit unit; and
a receiver including a channel estimator, a feedback information generator and a second transmit unit,
wherein the feedback information processor is configured to receive feedback information from the receiver, calculate each of a sum rate (R_MU) in a multi-user mode and a sum rate (R_SU) in a single-user mode using the feedback information, and select one of the single-user mode and the multi-user mode as a transmission mode depending on a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode,
the first transmit unit is configured to transmit a data stream according to the selected transmission mode,
the channel estimator is configured to acquire channel quality information (CQI) for each data stream transmitted individually via each antenna group,
the feedback information generator is configured to determine the CQI associated information from the CQI acquired individually for each antenna group corresponding to the transmission mode; and
the second transmit unit is configured to transmit the feedback information to the transmitter,
12. The closed-loop multi-antenna system of claim 11, wherein the feedback information processor collects the maximum CQI individually for each antenna group using the antenna index, selects the maximum CQI individually for each antenna group from the maximum CQI collected for each antenna group, and calculates the sum rate (R_MU) in the multi-user mode depending on a sum of the maximum CQI selected individually for each antenna group.
13. The closed-loop multi-antenna system of claim 12, wherein the feedback information processor collects the CQI associated with each antenna group taking into account the rank information individually for the receiver, calculates a sum rate individually for the receiver using the CQI collected for each antenna group, and determines, as the sum rate (R_SU) in the single-user mode, a greatest sum rate among the sum rates calculated individually for the receiver.
14. The closed-loop multi-antenna system of claim 13, wherein the CQI collected for each antenna group is one of the maximum CQI, and the remaining CQI included in feedback information received from the receiver.
15. The closed-loop multi-antenna system of claim 14, wherein the feedback information processor selects the multi-user mode as the transmission mode if the sum rate (R_SU) in the single-user mode is less than or equal to the sum rate (R_MU) in the multi-user mode, and selects the single-user mode as the transmission mode if the sum rate (R_SU) in the single-user mode is greater than the sum rate (R_MU) in the multi-user mode.
16. The closed-loop multi-antenna system of claim 11, wherein the channel estimator estimates a channel characteristic associated with each data stream transmitted individually via each antenna group through channel estimation on a received signal, and acquires the CQI associated with each data stream transmitted individually via each antenna group using the estimated channel characteristic.
17. The closed-loop multi-antenna system of claim 16, wherein the feedback information generator calculates the CQI for each data stream transmitted individually via each antenna group using the estimated channel characteristic using a first signal detection technique, and compares the CQI calculated individually for each data stream and determining a best CQI as the maximum CQI.
18. The closed-loop multi-antenna system of claim 17, wherein the feedback information generator calculates the CQI for a data stream transmitted via one of the antenna groups using the estimated channel characteristic using a second signal detection technique, calculates the CQI for a data stream transmitted via one of the antenna groups using the estimated channel characteristic using a third signal detection technique, and determines the rank information using the channel quality information calculated using the second signal detection technique and the channel quality information calculated using the third signal detection technique.
19. The closed-loop multi-antenna system of claim 18, wherein the first signal detection technique is a linear detection technique, and the second signal detection technique is a nonlinear detection technique and the third signal detection technique is a technique of turning-off remaining antenna groups, except for one antenna group among the antenna groups, and performing channel estimation on a data stream transmitted via the one antenna group, or
the first signal detection technique is a Minimum Mean Square Error (MMSE) technique, the second signal detection technique is a Successive Interference Cancellation (SIC) technique, and the third signal detection technique is a beam-forming technique.
20. The closed-loop multi-antenna system of claim 19, wherein the feedback information generator calculates a first rate using the maximum CQI and an Effective Signal-to-Noise Ratio (ESN) calculated by the SIC technique, calculates a second rate using on an ESN calculated by the beam-forming technique, comparing the first rate with the second rate;
if the first rate is less than or equal to the second rate, determining the rank information as a value for requesting transmission of multiple data streams via the antenna group, and determining the remaining channel quality information as an ESN calculated by the SIC technique, and
if the first rate is greater than the second rate, determining the rank information as a value determining the remaining channel quality information as an ESN calculated by the beam-forming technique.
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US84124606P true 2006-08-31 2006-08-31
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US13/348,266 US8542776B2 (en) 2006-08-31 2012-01-11 Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same
US11/896,479 Continuation US8111782B2 (en) 2006-08-31 2007-08-31 Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same
US20120170674A1 US20120170674A1 (en) 2012-07-05
US8542776B2 true US8542776B2 (en) 2013-09-24
ID=38769909
US11/896,479 Active 2030-04-04 US8111782B2 (en) 2006-08-31 2007-08-31 Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same
US13/348,266 Active US8542776B2 (en) 2006-08-31 2012-01-11 Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same
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