CN102739282B - Multi-antenna combined detection system of TD-SCDMA system and multi-antenna combined detection method thereof - Google Patents

Multi-antenna combined detection system of TD-SCDMA system and multi-antenna combined detection method thereof Download PDF

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CN102739282B
CN102739282B CN201110084301.3A CN201110084301A CN102739282B CN 102739282 B CN102739282 B CN 102739282B CN 201110084301 A CN201110084301 A CN 201110084301A CN 102739282 B CN102739282 B CN 102739282B
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channel
antenna
detection
matrix
code
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CN201110084301.3A
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CN102739282A (en
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严伟
李丹妮
王乃博
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联芯科技有限公司
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Abstract

The invention relates to a multi-antenna combined detection system of a TD-SCDMA system and a multi-antenna combined detection method thereof. The detection system comprises a plurality of antennas, a plurality of data separation units, a plurality of channel estimation units, a channel estimation postprocessing unit and a combined detection unit. All the antennas are used for receiving signals. The data separation units, which are respectively connected with the antennas, are used for separating training sequences and to-be-demodulated data in the received signals of the corresponding antennas. All the channel estimation units that are respectively connected with the data separation units are used for carrying out channel estimation by utilizing the training sequences. The channel estimation postprocessing unit utilizes channel estimation results of the plurality of channel estimation units to generate a channel system matrix. And the combined detection unit utilizes the channel system matrix and the to-be-demodulated data to calculate estimation values of useful signals in the received signals.

Description

The multiple antennas combined detection system of TD-SCDMA system and method thereof

Technical field

The present invention relates to TD-SCDMA system, especially relate to the multiple antennas combined detection system of TD-SCDMA system.

Background technology

Along with development and the 3G rise in the world of wireless communication technology, the more and more anxiety that Radio Resource does not become as a kind of limited resource.For the TD-SCDMA system of one of 3G mainstream standard, its Radio Resource be assigned with also is very limited.In order to improve the availability of frequency spectrum of TD-SCDMA system, identical networking becomes a kind of effective solution.But identical networking, while raising spectrum efficiency, also brings co-channel interference.Co-channel interference refers to that adjacent cell is because of the different districts inter-user interference using identical carrier frequency, identical spreading factor carries out transfer of data and causes.Co-channel interference can make the various aspects of performance such as power system capacity and communication quality decline all to some extent.

Co-channel interference belongs to the one of multi-access inference (MAI).TD-SCDMA system adopts joint detection algorithm to overcome multi-access inference (MAI).Meanwhile, the interference for adjacent area by estimating the channel impulse response of adjacent area, also can bring joint-detection into the interference of stronger adjacent area, thus eliminates stronger adjacent area interference.

But for the consideration of the factors such as implementation complexity, current joint detection algorithm adopts single antenna process at present, the maximum code number of channels of support is 16.When adjacent area interference source is more time, the situation that total code channel number is greater than 16 will inevitably be there is.Now, some code channel cannot participate in joint-detection, causes eliminating this part multi-access inference.

Summary of the invention

The object of the invention is the multiple antennas combined detection system and the method that propose a kind of TD-SCDMA system, with when code channel number increases, still can eliminate multi-address in same frequency interference.

The multiple antennas combined detection system of a kind of TD-SCDMA system proposed by the invention, comprises multiple antenna, multiple data separating unit, multiple channel estimating unit, a channel estimating post-processing unit and a joint-detection unit.Each antenna is used for Received signal strength.Each data separating unit connects an antenna respectively, in order to by the training sequence in the Received signal strength of respective antenna and data separating to be demodulated.Each channel estimating unit connects a data separating unit respectively, carries out channel estimating in order to utilize this training sequence.Channel estimating post-processing unit utilizes the channel estimation results of multiple channel estimating unit, generates channel system matrix.Joint-detection unit utilizes this channel system matrix and this data to be demodulated, calculates the estimated value of the useful signal in Received signal strength.

In one embodiment of this invention, a predetermined number code channel supported by each antenna.

In one embodiment of this invention, the restriction of this joint-detection unit participates in the code channel number of joint-detection, makes code channel number be less than or equal to this channel system rank of matrix.

In one embodiment of this invention, this joint-detection unit limits the code channel number participating in joint-detection by the thresholding improving code-division activated detection.

In one embodiment of this invention, the number of described antenna, data separating unit and channel estimating unit is two.

In one embodiment of this invention, the estimated value of this useful signal is nonlinear IEM model.

The present invention separately proposes a kind of multiple antennas associated detecting method of TD-SCDMA system, comprises the following steps: utilize multiple antenna receiving signal, and this Received signal strength comprises training sequence and data to be demodulated; Data separating is carried out to the Received signal strength of each antenna, to obtain training sequence and data to be demodulated respectively; This training sequence is utilized to carry out channel estimating to each antenna; The channel estimation results of multiple antenna is merged and carries out reprocessing, to obtain a channel system matrix; And utilize this channel system matrix and this data to be demodulated, calculate the estimated value of the useful signal in Received signal strength.

In one embodiment of this invention, a predetermined number code channel supported by each antenna.

In one embodiment of this invention, also comprise the code channel number that restriction participates in joint-detection, make code channel number be less than or equal to this channel system rank of matrix.

In one embodiment of this invention, be limit by the thresholding of raising code-division activated detection the code channel number participating in joint-detection.

In one embodiment of this invention, described number of antennas is two.

In one embodiment of this invention, the estimated value of this useful signal is nonlinear IEM model.

Combined detection system compared to existing technology, the combined detection system of multiple antennas proposed by the invention, both receptivity can be improved by diversity reception, can be improved again anti-with ability frequently by spatial reuse, thus from Received signal strength, isolate useful signal more exactly, and then significantly improve the demodulation performance of Received signal strength.

Accompanying drawing explanation

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 illustrates dual-antenna reception baseband model according to an embodiment of the invention.

Fig. 2 illustrates the combined detection system of one embodiment of the invention.

Fig. 3 illustrates the associated detecting method of one embodiment of the invention.

Embodiment

The description of detail is carried out below, to provide the overall understanding to multiple antennas combined detection system of the present invention for TD-SCDMA wireless communication system.For simplified characterization, in the following description will for two antennas.System is comprised to the situation of unnecessary two antennas, its model is similar to the model that will describe below.

Fig. 1 illustrates systems baseband model according to an embodiment of the invention, wherein, and e 1and e 2be respectively the data to be demodulated of the reception of two antennas.A (1)and A (2)be respectively the channel system matrix on two antennas, wherein in sub-block represent the channel vector of i-th code channel on jth root antenna. represent the jth symbol on i-th code channel.N 1and n 2represent the white Gaussian noise comprised in Received signal strength respectively, n ibe variance be σ 2and Normal Distribution N (0, σ 2) white Gaussian noise.

In TD-SCDMA wireless communication system, the data to be demodulated in Received signal strength can be defined as usually:

e=A·d+n (1.1)

Wherein A is channel system matrix, and d is useful signal, and n is the white Gaussian noise comprised in Received signal strength.

From baseband model, relative to single antenna, the channel system matrix-expand of dual-antenna reception is:

A = A ( 1 ) A ( 2 ) ;

Data expansion to be demodulated is:

e = e ( 1 ) e ( 2 ) ;

The white Gaussian noise comprised in Received signal strength expands to:

n = n 1 n 2 .

As the result of two antenna joint-detection, similar with the principle of single antenna joint-detection, the Minimum Mean Square Error (MMSE) of useful signal d is estimated as:

d ^ = ( A H A + σ 2 I ) - 1 A H e - - - ( 1.2 )

Wherein, represent the nonlinear IEM model of useful signal d, A hrepresent the conjugate transpose of channel system matrix A, I representation unit matrix.

The system of the joint-detection of multiple antennas having thus described the invention integrates multi-antenna diversity to receive and spatial reuse.It both can improve receptivity by diversity reception, can be improved again anti-with ability frequently, thus from Received signal strength, isolate useful signal more exactly, and then significantly improve the demodulation performance of Received signal strength by spatial reuse.Specifically, when total code channel number of joint-detection is lower than 16 code channels, this system is equivalent to a multi-antenna diversity receiving system, obtains good diversity gain; When total code channel number of joint-detection is 32 code channels, this system is equivalent to a space multiplexing system, supports that 32 code channels participate in joint-detection simultaneously; And when code channel number is between 16 and 32, then existing diversity gain, has again spatial multiplexing gain (anti-with ability frequently).

Based on above analysis, a combined detection system according to an embodiment of the invention is as shown in Figure 2 described.As shown in Figure 2, this combined detection system 200 comprises: two antennas 201,202, two data separative elements 211,212, two channel estimating unit 221,222, channel estimating post-processing unit 230 and joint-detection unit 240.Each data separating unit and the corresponding road antenna of channel estimating unit.Such as, the first data separating unit 211 and corresponding first antenna 202 of the first channel estimating unit 221; Second data separating unit 212 and corresponding second antenna 202 of second channel estimation unit 222.

Specifically, two data separative elements 211,212 are used for being separated from the training sequence the signal of two antennas 201,202 reception and data to be demodulated respectively.

Two channel estimating unit 221,222 utilize training sequence to carry out channel estimating.

Channel estimating post-processing unit 230 utilizes the channel estimation results of two channel estimating unit 221,222, generates channel system matrix A.At this, channel system matrix A just as shown in Figure 1, by the channel system matrix A of two antennas (1)and A (2)combine.

Joint-detection unit 240 utilizes channel system matrix and data to be demodulated, calculates the nonlinear IEM model of the useful signal in Received signal strength for follow-up solution mediation decoding.

Accordingly, Fig. 3 illustrates the associated detecting method of one embodiment of the invention.With reference to shown in Fig. 3, in step S300, utilize multiple antenna receiving signal, then in step S301, data separating is carried out to the Received signal strength of each antenna, be separated training sequence wherein and data to be demodulated.In step S302, training sequence is utilized to carry out channel estimating to each antenna.Then in step S303, the channel estimation results of multiple antenna is merged and carries out reprocessing, to obtain channel system matrix A.Finally, in step S304, utilize channel system matrix and data to be demodulated, calculate the nonlinear IEM model of useful signal

Although it should be noted that and be presented above the embodiment that joint-detection adopts nonlinear IEM model, should be able to recognize, communication system of the present invention and subscriber equipment are not limited to this example, but additive method can be adopted to estimate.

In addition, in Project Realization, cannot ensure that the data that two antennas receive are completely independent.Between antenna, the correlation of data means that channel system matrix A is not full rank, and the now decomposition of correlation matrix is unstable, thus the demodulation performance for Received signal strength is deteriorated.Therefore, need to avoid this situation by increasing some safeguard measures, such as joint-detection unit 240 participates in the code channel number of joint-detection by restriction, makes code channel number be less than or equal to rank of matrix, ensures the stable of matrix decomposition.In one embodiment, joint-detection unit 240 can by improving the thresholding of code-division activated detection, the situation that the code channel number preventing code channel activating error detection from causing is more.

With conventional single-antenna with compared with frequency combined detection system, the channel estimating post-processing unit of the multiple antennas combined detection system described by the embodiment of the present invention exports the channel system matrix of two antennas simultaneously, and the channel system matrix making joint-detection unit can combine two antennas carries out MIMO detection; And owing to adopting MIMO to detect, joint-detection can detect the data of more code channels.For two antennas, the data of 32 code channels can be detected at most.

Therefore, compare conventional single-antenna with frequency combined detection system, the multiple antennas combined detection system of the embodiment of the present invention has stronger joint-detection ability, improves the ability of Cochannel interference, and when the non-full rank of channel system matrix, system has certain diversity gain.In addition, this multiple antennas combined detection system can be considered in fact the system of a MIMO in conjunction with joint-detection, can to MIMO-CDMA system smooth evolution.

Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.

Claims (12)

1. a multiple antennas combined detection system for TD-SCDMA system, comprising:
Multiple antenna, the Received signal strength of each antenna comprises the co-channel interference signal of adjacent area;
Multiple data separating unit, each data separating unit connects an antenna respectively, in order to by the training sequence in the Received signal strength of respective antenna and data separating to be demodulated;
Multiple channel estimating unit, each channel estimating unit connects a data separating unit respectively, carries out channel estimating in order to utilize this training sequence;
Channel estimating post-processing unit, utilizes the channel estimation results of multiple channel estimating unit, and generate channel system matrix, the code channel number that this channel system matrix comprises is that M, M are greater than 16, and has (M-16) individual adjacent area code channel at least;
Joint-detection unit, utilizes this channel system matrix and this data to be demodulated, calculates the estimated value of the useful signal in Received signal strength.
2. the system as claimed in claim 1, is characterized in that, a predetermined number code channel supported by each antenna.
3. the system as claimed in claim 1, is characterized in that, the restriction of this joint-detection unit participates in the code channel number of joint-detection, makes code channel number be less than or equal to this channel system rank of matrix.
4. system as claimed in claim 3, is characterized in that, this joint-detection unit limits the code channel number participating in joint-detection by the thresholding improving code-division activated detection.
5. the system as claimed in claim 1, is characterized in that, the number of described antenna, data separating unit and channel estimating unit is two.
6. the system as claimed in claim 1, is characterized in that, the estimated value of this useful signal is nonlinear IEM model.
7. a multiple antennas associated detecting method for TD-SCDMA system, comprises the following steps:
Utilize multiple antenna receiving signal, this Received signal strength comprises training sequence and data to be demodulated, and the Received signal strength of each antenna comprises the co-channel interference signal of adjacent area;
Data separating is carried out to the Received signal strength of each antenna, to obtain training sequence and data to be demodulated respectively;
This training sequence is utilized to carry out channel estimating to each antenna;
Merge the channel estimation results of multiple antenna and carry out reprocessing, to obtain a channel system matrix, the code channel number that this channel system matrix comprises is that M, M are greater than 16, and has (M-16) individual adjacent area code channel at least; And
Utilize this channel system matrix and this data to be demodulated, calculate the estimated value of the useful signal in Received signal strength.
8. method as claimed in claim 7, is characterized in that, a predetermined number code channel supported by each antenna.
9. method as claimed in claim 7, is characterized in that, also comprises the code channel number that restriction participates in joint-detection, makes code channel number be less than or equal to this channel system rank of matrix.
10. method as claimed in claim 9, is characterized in that, is limited the code channel number participating in joint-detection by the thresholding improving code-division activated detection.
11. methods as claimed in claim 7, it is characterized in that, described number of antennas is two.
12. methods as claimed in claim 7, is characterized in that, the estimated value of this useful signal is nonlinear IEM model.
CN201110084301.3A 2011-04-02 2011-04-02 Multi-antenna combined detection system of TD-SCDMA system and multi-antenna combined detection method thereof CN102739282B (en)

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Publication number Priority date Publication date Assignee Title
CN1604512A (en) * 2003-09-29 2005-04-06 富士通株式会社 United detecting method and apparatus
CN1770650A (en) * 2004-10-15 2006-05-10 展讯通信(上海)有限公司 Maximum ratio combining of channel estimation for joint detection in TD-SCDMA systems
CN101257324A (en) * 2007-02-28 2008-09-03 展讯通信(上海)有限公司 Linear combined channel estimation method in TD-SCDMA system
CN101267585A (en) * 2007-03-16 2008-09-17 展讯通信(上海)有限公司 Method and receiving device for TD-SCDMA system to send and receiving broadcast service

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1604512A (en) * 2003-09-29 2005-04-06 富士通株式会社 United detecting method and apparatus
CN1770650A (en) * 2004-10-15 2006-05-10 展讯通信(上海)有限公司 Maximum ratio combining of channel estimation for joint detection in TD-SCDMA systems
CN101257324A (en) * 2007-02-28 2008-09-03 展讯通信(上海)有限公司 Linear combined channel estimation method in TD-SCDMA system
CN101267585A (en) * 2007-03-16 2008-09-17 展讯通信(上海)有限公司 Method and receiving device for TD-SCDMA system to send and receiving broadcast service

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