CN101630962B - Combined detection method, device for communication equipment and communication equipment - Google Patents

Abstract

The invention discloses a combined detection method, a device for communication equipment and the communication equipment. The combined detection method includes computing a matched filter function of the received signal and a correlation matrix related to the transmission channel by useful signal included in the received signal and channel estimation result of the transmission channel; converting correlation matrices into forms of lower triangular matrices, diagonal matrices, and products of associated matrices of lower triangular matrices by LDLH decomposition of the correlation matrices; and computing the useful signal using lower triangular matrices, diagonal matrices, associated matrices of the lower triangular matrices and the computation result of the matching filtering function.

Description

For associated detecting method, device and the communication equipment of communication equipment

Technical field

The present invention relates to wireless communication field, relate more specifically to a kind of associated detecting method for communication equipment, device and communication equipment can be used in TDS-CDMA system.

Background technology

Along with the development of wireless communication technology, Radio Resource day is becoming tight.TD SDMA (TD-SCDMA) system of one of 3G (Third Generation) Moblie (3G) mainstream standard is no exception.In order to improve the availability of frequency spectrum, TD-SCDMA system has adopted identical networking solution, but therefore causes co-channel interference.Co-channel interference mainly contains two classes: 1) community internal interference, claims again multiple access to disturb (MAI), the interference that inner other subscriber signals in same community cause; 2) presence of intercell interference, the interference that cause other co-frequency cells.

In code division multiple access (CDMA) system, in same community, multiple users' signal is aliasing on time domain and frequency domain, when reception, need on numeric field, separate.It is the processing of interference signal that signal separates one of the problem that must consider.In cdma system, between the signal due to each user, there is certain correlation, so there is MAI.The MAI being produced by individual user is no doubt very little, and, along with the increasing or the reinforcement of signal power of number of users, MAI just becomes main an interference of wideband CDMA system.

Traditional cdma system is regarded thermal noise as MAI and is disturbed and treat, and each user's signal is separated and regards separately independently process as.Sort signal isolation technics is called as alone family and detects.But in MAI, comprise the information of many priori, as the subscriber channel code knowing, each user's channel estimating etc.If these prior informations are utilized, the accuracy that signal separates will improve greatly.Make full use of prior information in MAI and the signal separating method that a RUP is regarded in the separation of all subscriber signals as is called as to multiuser detection.

According to the difference to code division multiple access processing method, multiuser detection can be divided into again two kinds of Interference Cancellation and joint-detection.The basic thought of interference cancellation techniques is decision-feedback, first from total reception signal, rules out some of data, reconstructs signal corresponding to data according to data and user's spreading code; From total reception signal, deduct reconstruction signal again, so loop iteration.Associated detection technique makes full use of multiple access and disturbs, and within a step, all users' signal is all separated.

Fig. 1 shows the logic diagram of existing a kind of joint-detection device.As shown in Figure 1, joint-detection device 100 mainly comprises filter function computing unit 102, correlation matrix generation unit 104 and joint-detection performance element 106.Wherein, filter function computing unit 102 calculates the matched filtering function result of calculation e of reception signal and the correlation matrix R relevant with the transmission channel of the useful signal comprising in reception signal according to the channel estimation results for the transmission channel that receives the useful signal comprising in signal from channel estimating apparatus respectively with correlation matrix generation unit 104, and matched filtering function result of calculation e and correlation matrix R are offered to joint-detection performance element 106.Joint-detection performance element 106, according to equation (1), utilizes the inverse matrix of matched filtering function result of calculation e and correlation matrix R to calculate described useful signal d.

D=R ^-1e equation (1)

From above description, before carrying out the calculating of equation (1), need to first obtain the inverse matrix of correlation matrix R.Obtain the required amount of calculation of inverse of a matrix matrix conventionally very large.

In order to reduce amount of calculation, in existing joint-detection device, conventionally correlation matrix R is decomposed into the lower triangular matrix L shown in equation (2) and conjugate transpose L thereof ^hthe form (that is, correlation matrix being carried out to Cholesky decomposition) of product, then calculate and receive the useful signal d (X represents intermediate variable) comprising in signal according to equation (3) and (4).

R=LL ^hequation (2)

LX=e equation (3)

L ^hd=X equation (4)

Wherein, can calculate each element in lower triangular matrix L according to equation (5) and (6).

$l_{j,j}=\sqrt{r_{j,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\left|l_{j,n}\right|}^2}$ Equation (5)

$l_{i,j}=\frac{1}{l_{j,j}}(r_{i,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{l}_{i,n}\·l_{j,n}^{*})(i>j)$ Equation (6)

In equation (5) and (6), r _{j, j}represent the element that j is capable, j is listed as in correlation matrix R, l _{j, j}represent the element that j is capable, j is listed as in lower triangular matrix L, r _{i, j}represent the element that i is capable, j is listed as in correlation matrix R, l _{i, j}represent the element that i is capable, j is listed as in lower triangular matrix L, l _{j, n} ^*represent the element l that j is capable, n is listed as in lower triangular matrix L _{j, n}conjugation.

Can find out from equation (5) and (6), although do not need directly to calculate the inverse matrix of correlation matrix R in above-mentioned joint-detection device, need to carry out square root calculation, so operand is still very large.In the time using above-mentioned joint-detection device on the subscriber equipment at such as mobile phone etc., can there is the problem that user facility operation delay of response and power consumption are larger.

Summary of the invention

Problem in view of the above, the invention provides a kind of associated detecting method for communication equipment that can be used for TDS-CDMA system and device and communication equipment of novelty.

Comprise according to the associated detecting method for communication equipment of the embodiment of the present invention: utilize the channel estimation results of the transmission channel that receives the useful signal that comprises of signal, calculate the matched filtering function result of calculation and the correlation matrix relevant with described transmission channel of described reception signal; By described correlation matrix is carried out to LDLH decomposition, described correlation matrix is converted to the form of the product of the conjugate transpose of lower triangular matrix, diagonal matrix and described lower triangular matrix; And utilize conjugate transpose and the described matched filtering function result of calculation of described lower triangular matrix, described diagonal matrix, described lower triangular matrix, calculate described useful signal.

Comprise according to the joint-detection device for communication equipment of the embodiment of the present invention: parameter calculation unit, be configured to utilize the channel estimation results of the transmission channel that receives the useful signal comprising in signal, calculate the matched filtering function result of calculation and the correlation matrix relevant with described transmission channel of described reception signal; Matrix decomposition unit, is configured to, by described correlation matrix is carried out to LDLH decomposition, described correlation matrix is converted to the form of the product of the conjugate transpose of lower triangular matrix, diagonal matrix and described lower triangular matrix; And detection performance element, be configured to utilize conjugate transpose and the described matched filtering function result of calculation of described lower triangular matrix, described diagonal matrix, described lower triangular matrix, calculate described useful signal.

From the above, neither need directly to ask in the present invention the inverse matrix of described correlation matrix, do not need to calculate each element in described lower triangular matrix by square root calculation yet, so can complete joint-detection by relatively little amount of calculation, thereby can reduce the computation burden of joint-detection device and shorten the required time of joint-detection.

Accompanying drawing explanation

Below in conjunction with accompanying drawing in the description of the specific embodiment of the present invention, the present invention may be better understood, wherein:

Fig. 1 shows the logic diagram of existing a kind of joint-detection device;

Fig. 2 shows the brief block diagram of TD-SCDMA wireless communication system;

Fig. 3 shows the brief block diagram of the concrete structure of the subscriber equipment shown in Fig. 2;

Fig. 4 shows according to the logic diagram of the joint-detection device of the embodiment of the present invention; And

Fig. 5 shows according to the flow chart of the associated detecting method of the embodiment of the present invention.

Embodiment

Feature and the exemplary embodiment of various aspects of the present invention will be described in detail below.Followingly be applied as routine description with TD-SCDMA and contained many details, to complete understanding of the present invention is provided.But, it will be apparent to one skilled in the art that the present invention can implement some details in these details in the case of not needing.Below the description of embodiment is only used to by illustrating that example of the present invention provides the clearer understanding to the present invention.The present invention is never limited to any concrete configuration and the algorithm that propose below, but has covered under the premise of without departing from the spirit of the present invention any modification, replacement and the improvement of coherent element, parts and algorithm.

Fig. 2 shows the brief block diagram of TD-SCDMA wireless communication system.As shown in Figure 2, this wireless communication system mainly comprises core net 202, wireless access network 204 and subscriber equipment 206.Core net 202 is main process audio call, data connection and exchange, customer position information management, network characteristic and Service control, signaling and user profile transmission mechanism in wireless communication system and with being connected and route etc. of other network.Wireless access network 204 provides the connection of subscriber equipment and core net, and the management of responsible Radio Resource and allotment, comprises base station and radio network controller two category nodes.Subscriber equipment 206 can be for example the Portable data processing equipment that mobile phone, personal digital assistant (PDA) or other have the function communicating in TD-SCDMA wireless communication system.

Fig. 3 shows the brief block diagram of the concrete structure of subscriber equipment shown in Fig. 2.As shown in Figure 3, this subscriber equipment mainly comprises radio-frequency module 302, forming filter 304, channel estimation module 306, multipath tracking module 308, activates detection module 310, joint-detection module 312, frequency deviation estimating modules 314, ANR/SNR measurement module 316, demapping (demapping) module 318 and decoder module 320.Radio-frequency module 302 unloads ripple and analog-to-digital conversion processing to received analog signal, is input to subordinate so that the analog signal being received is transformed to baseband digital signal.Forming filter 304, root raised cosine filter (SRRC) carries out pulse shaping to baseband digital signal.Channel estimation module 306 carries out the channel estimating of multiple communities for the midamble code sequence in the signal after pulse shaping.Multipath tracking module 308 is utilized channel estimation results, determines optimum sampling point, and carries out the multipath window position tracking of each community.Activate detection module 310 and activate detection and code channel activating detection for carrying out window.Joint-detection module 312 is carried out certain calculating to the data that are aliasing in each code channel together, obtains the transmission symbol on each code channel.Frequency deviation estimating modules 314 is utilized the skew of joint detection results estimated frequency.ANR/SNR measurement module 316 utilizes joint detection results to carry out amplitude and noise ratio (ANR) and signal to noise ratio (SNR) is measured.Demapping (demapping) module 318 is that soft bit is delivered to decoder module by the symbol transition of joint-detection module output.Decoder module 320, to the soft bit result of demapping module output is decoded, obtains information bit.

The disclosure is mainly for the improvement of joint-detection module.Should be noted that, although provided TD-SCDMA wireless communication system as shown in Figures 2 and 3 and the ios dhcp sample configuration IOS DHCP of subscriber equipment above, but can recognize, can use therein communication system of the present invention and subscriber equipment to be not limited to this concrete example, but can be suitable for carrying out various systems and the equipment of joint-detection.

Fig. 4 shows according to the logic diagram of the joint-detection device of the embodiment of the present invention.As shown in Figure 4, this joint-detection device mainly comprises parameter calculation unit 402, matrix decomposition unit 404 and detects performance element 406.Wherein, parameter calculation unit 402 is utilized the channel estimation results of the transmission channel that receives the useful signal comprising in signal, calculates the matched filtering function result of calculation and the correlation matrix relevant with described transmission channel of described reception signal; Matrix decomposition unit 404, by described correlation matrix is carried out to LDLH decomposition, is converted to described correlation matrix the form of the product of the conjugate transpose of lower triangular matrix, diagonal matrix and described lower triangular matrix; And detect performance element 406 and utilize conjugate transpose and the described matched filtering function result of calculation of described lower triangular matrix, described diagonal matrix, described lower triangular matrix, calculate described useful signal.

Fig. 5 shows according to the flow chart of the associated detecting method of the embodiment of the present invention.As shown in Figure 5, this associated detecting method mainly comprises:

At step S502, utilize the channel estimation results of the transmission channel that receives the useful signal comprising in signal, calculate the matched filtering function result of calculation e and the correlation matrix R relevant with described transmission channel that receive signal.This step for example can be completed by parameter calculation unit 402.

At step S504, according to following equation (7), correlation matrix R is carried out to LDLH decomposition, correlation matrix R is converted to the conjugate transpose L of lower triangular matrix L, diagonal matrix D and lower triangular matrix ^hthe form of product.This step for example can be completed by matrix decomposition unit 404.

R=LDL ^hequation (7)

Wherein, all diagonal elements of lower triangular matrix L are all 1, can calculate the element in diagonal matrix D according to following equation (8), calculate the element beyond the diagonal element in lower triangular matrix L according to following equation (9).

${\mathrm{\ξ}}_j=r_{j,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{\left|l_{j,n}\right|}^2$ Equation (8)

$l_{i,j}=\frac{1}{{\mathrm{\ξ}}_j}(r_{i,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{l}_{i,n}\·l_{j,n}^{*})$ Equation (9)

In above equation (8) and (9), ξ _jrepresent the capable diagonal element of j in diagonal matrix D, r _{i, j}represent the element that i is capable, j is listed as in correlation matrix R, l _{i, j}represent the element that i is capable, j is listed as in lower triangular matrix L, l _{j, n} ^*represent the conjugation of the element that j is capable, n is listed as in lower triangular matrix L.

At step S506, utilize the conjugate transpose L of lower triangular matrix L, diagonal matrix D, lower triangular matrix according to following equation (10)～(12) ^hand matched filtering function result of calculation e, calculate useful signal d.

LX1=e equation (10)

DX2=X1 equation (11)

L ^hd=X2 equation (12)

Below with reference to specific embodiments of the invention, the present invention has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present invention that limited by claims or its equivalent.

Can perform step with hardware or software as required.Note, without departing from the scope of the invention, can add step, therefrom remove step or revise step wherein to the flow chart providing in this specification.In general, flow chart is just used to refer to a kind of possible sequence for the basic operation of practical function.

Embodiments of the invention can utilize programming general purpose digital computer, utilize application-specific integrated circuit (ASIC), programmable logic device, field programmable gate array, light, chemistry, biological, system quantum or nanometer engineering, assembly and mechanism to realize.In general, function of the present invention can be realized by any means known in the art.Can use distributed or networked system, assembly and circuit.The communication of data or to transmit can be wired, wireless or by any other means.

Also will recognize, according to the needs of application-specific, one or more can, by more separating or more integrated mode realizes, or being removed even in some cases or being deactivated in the key element shown in accompanying drawing.The journey logic bomb that realization can be stored in machine readable media is carried out above-mentioned any method with permission computer, also within the spirit and scope of the present invention.

In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, rather than restrictive, unless separately there is concrete indication.Make to separate or the ability of combination while not knowing when term is also contemplated as, the combination of assembly or step also will be considered to record.

Claims (7)

1. for an associated detecting method for communication equipment, comprising:

Utilize the channel estimation results of the transmission channel that receives the useful signal comprising in signal, calculate the matched filtering function result of calculation and the correlation matrix R relevant with described transmission channel of described reception signal;

By described correlation matrix R is carried out to LDLH decomposition, described correlation matrix R is converted to the conjugate transpose L of lower triangular matrix L, diagonal matrix D and described lower triangular matrix L ^hthe form of product; And

Utilize conjugate transpose and the described matched filtering function result of calculation of described lower triangular matrix, described diagonal matrix, described lower triangular matrix, calculate described useful signal;

All diagonal elements of wherein said lower triangular matrix L are all 1,

Calculate the element in described diagonal matrix D according to following equation:

${\mathrm{\ξ}}_j=r_{j,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{\left|l_{j,n}\right|}^2$

And calculate the element in described lower triangular matrix L according to following equation:

$l_{i,j}=\frac{1}{{\mathrm{\ξ}}_j}(r_{i,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{l}_{i,n}\·l_{j,n}^{*}),$

Wherein, ξ _jrepresent the capable diagonal element of j in described diagonal matrix D, r _{i, j}represent the element that i is capable, j is listed as in described correlation matrix R, l _{i, j}represent the element that i is capable, j is listed as in described lower triangular matrix L,

represent the conjugation of the element that j is capable, n is listed as in described lower triangular matrix L.

2. the associated detecting method for communication equipment according to claim 1, is characterized in that, according to equation LX1=e, DX2=X1 and L ^huseful signal d described in d=X2 iterative computation, wherein e represents described matched filtering function result of calculation.

3. the associated detecting method for communication equipment according to claim 1 and 2, is characterized in that, described associated detecting method is for TDS-CDMA system.

4. for a joint-detection device for communication equipment, comprising:

Parameter calculation unit, is configured to utilize the channel estimation results of the transmission channel that receives the useful signal comprising in signal, calculates the matched filtering function result of calculation and the correlation matrix relevant with described transmission channel of described reception signal;

Matrix decomposition unit, is configured to, by described correlation matrix R is carried out to LDLH decomposition, described correlation matrix R is converted to the conjugate transpose L of lower triangular matrix L, diagonal matrix D and described lower triangular matrix L ^hthe form of product; And

Detect performance element, be configured to utilize conjugate transpose and the described matched filtering function result of calculation of described lower triangular matrix, described diagonal matrix, described lower triangular matrix, calculate described useful signal;

All diagonal elements of wherein said lower triangular matrix L are all 1;

Wherein said matrix decomposition unit calculates the element in described diagonal matrix D according to following equation:

${\mathrm{\ξ}}_j=r_{j,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{\left|l_{j,n}\right|}^2;$ And

Wherein said matrix decomposition unit calculates the element in described lower triangular matrix L according to following equation:

$l_{i,j}=\frac{1}{{\mathrm{\ξ}}_j}(r_{i,j}-\underset{n=1}{\overset{j-1}{\mathrm{\Σ}}}{\mathrm{\ξ}}_n{l}_{i,n}\·l_{j,n}^{*}),$

Wherein, ξ _jrepresent the capable diagonal element of j in described diagonal matrix D, r _{i, j}represent the element that i is capable, j is listed as in described correlation matrix R, l _{i, j}represent the element that i is capable, j is listed as in described lower triangular matrix L,

represent the conjugation of the element that j is capable, n is listed as in described lower triangular matrix L.

5. the joint-detection device for communication equipment according to claim 4, is characterized in that, described detection performance element is according to equation LX1=e, DX2=X1 and L ^huseful signal d described in d=X2 iterative computation, wherein e represents described matched filtering function result of calculation.

6. according to the joint-detection device for communication equipment described in claim 4 or 5, it is characterized in that, described associated detecting method is for TDS-CDMA system.

7. a communication equipment, is characterized in that, comprises the joint-detection device described in any one in claim 4 to 6.

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