CN101902246A - Method and equipment for detecting multicast single-frequency network received signal - Google Patents
Method and equipment for detecting multicast single-frequency network received signal Download PDFInfo
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- CN101902246A CN101902246A CN2009100522104A CN200910052210A CN101902246A CN 101902246 A CN101902246 A CN 101902246A CN 2009100522104 A CN2009100522104 A CN 2009100522104A CN 200910052210 A CN200910052210 A CN 200910052210A CN 101902246 A CN101902246 A CN 101902246A
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Abstract
The invention discloses a method and equipment for detecting a multicast single-frequency network received signal. The method comprises the following steps of: respectively extracting a boot sequence and common data from a received signal; eliminating interference caused by the boot sequence from the common data; performing chip-level balancing on the data after interference elimination; and de-spreading the balanced data to obtain an estimated value of each code channel data symbol. Through the method and the equipment, the signal of each code channel can be simply and effectively recovered and the detection performance is improved.
Description
Technical field
The present invention relates to the communication technology, be specifically related to a kind of multicast single-frequency network received signal detection method and equipment.
Background technology
In TD-SCDMA (TD SDMA access) system, the base station utilizes the symmetry of TDD (time division duplex) system up-downgoing channel usually, adopts wave beam forming with the elevator system performance when sending downlink data.Like this, at each UE, different user (being embodied on the different code channels) has experienced different equivalent channel, and therefore existing detection algorithm mainly is based on joint-detection, be about to channel and spreading code and unite consideration, directly from received signal, recover the data symbol sequence of transmission.
As shown in Figure 1, be MMSE (least mean-square error) the joint-detection schematic diagram that prior art is used wave beam forming.
D wherein
(k)The data symbol vector of representing k code channel, c
(k)The spreading code of representing k code channel correspondence, h
(k)Represent the channel impulse response vector of k code channel correspondence, n represents noise,
Represent the estimation of k code channel data symbol.A represents the sytem matrix be made up of each spreading code and channel, typically, and can be by spreading code c
(k)With channel h
(k)Structure impulse response tectonic association channel impulse response b
(k), again by aggregate channel impulse response b
(k)Constitute the A matrix.B wherein
(k)=c
(k)* h
(k), * represents convolution algorithm.
In the prior art, in order to recover the data symbol sequence of required code channel more satisfactoryly, need detect all activated code channels, and carry out joint-detection according to the activated code channel testing result.
Its typical realization flow is as shown in Figure 2:
201, from received signal, extract homing sequence and general data part respectively;
202, carry out channel estimating according to homing sequence;
203, detect activated code channel according to current channel estimation results;
204, from general data, eliminate the interference that homing sequence causes according to the activated code channel testing result;
205, according to channel estimation results and detected activated code channel calculation combination channel impulse response, promptly corresponding to b shown in Figure 1
(k)=c
(k)* h
(k)
206, utilize described aggregate channel impulse response that the general data of eliminating after homing sequence disturbs is carried out matched filtering;
207, according to aggregate channel impulse response generation system correlation matrix;
208, according to matched filtering result and described system correlation matrix, generate the estimation that sends data symbol.
Typically, in TD-SCDMA, activated code channel detects and carries out by means of homing sequence, and in actual applications, in order to improve the detection performance of activated code channel, can carry out repeatedly activated code channel and detect.
By above-mentioned flow process as seen, incorrect if activated code channel detects, then disturb the influence of code channel still to exist, promptly detect performance and can be subjected to the influence that activated code channel detects.In addition; under the situation of wave beam forming; in order to make each UE can both estimate the equivalent channel response of each activated code channel correspondence; it is the response of uniting of real channel response and transmitting terminal wave beam forming; different UEs can be used different cyclic shift M idamble (training sequence) usually, and receiving terminal utilizes Midamble to estimate that the equivalent channel response of different UEs detects with auxiliary code channel activating.Because need to consider the influence of non-user's code channel, the amount of calculation of prior art is also relatively large.
MBMS (multimedia broadcast-multicast service) technology is used to that the user provides multimedia broadcasting and multicast services in the wireless area, MBMS can carry out single cell transmission, also can carry out many cell transmission, many cell transmission of MBMS can adopt MBSFN (multicast single-frequency network) transmission means.So-called MBSFN is meant at one time and carries out synchronous transmission with same frequency in a plurality of sub-districts.Use this transmission means can save frequency resource, improve the availability of frequency spectrum.
In MBSFN, signal transmits on independent carrier wave, and because to full Cell Broadcast CB, sends signal and without wave beam forming.And in MBSFN, it doesn't matter for the leading part of each time slot and activated code channel, therefore UE can't be as prior art, utilize targeting sequencing auxiliary detection activated code channel, if thereby carry out joint-detection according to prior art, can make code channel detect performance and reduce.
Summary of the invention
The embodiment of the invention provides a kind of multicast single-frequency network received signal detection method and equipment, to recover the signal of each code channel simply and effectively.
For this reason, the embodiment of the invention provides following technical scheme:
A kind of multicast single-frequency network received signal detection method comprises:
From received signal, extract homing sequence and general data respectively;
From described general data, eliminate the interference that described homing sequence produces;
Carry out chip-level equalisation to eliminating data after interference;
Balanced data is carried out despreading, obtain the estimated value of each code channel data symbol.
A kind of multicast single-frequency network received signal checkout equipment comprises:
The data separating unit is used for extracting homing sequence and general data respectively from received signal;
Interference cancellation unit is used for eliminating the interference that described homing sequence produces from described general data;
Balanced unit is used for carrying out chip-level equalisation to eliminating data after interference;
Despread unit is used for balanced data is carried out despreading, obtains the estimated value of each code channel data symbol.
Embodiment of the invention multicast single-frequency network received signal detection method and equipment, when the MBSFN received signal is detected, the influence of spread spectrum and the influence of channel are handled respectively, multipath channel is carried out the equilibrium of chip-level, eliminate the interference between code channel, chip data after the equilibrium are carried out despreading, recover the data symbol of transmission.Thereby need not to detect activated code channel, improved the detection performance; And, be convenient to optimize and reduced amount of calculation with channel and spread spectrum difference individual processing.
Description of drawings
Fig. 1 is the MMSE joint-detection schematic diagram that prior art is used wave beam forming;
Fig. 2 is the typical realization flow of joint-detection in the prior art;
Fig. 3 is a TD-SCDMA MBSFN structure of time slot schematic diagram;
Fig. 4 is the realization flow figure of embodiment of the invention multicast single-frequency network received signal detection method;
Fig. 5 is the principle schematic that realizes chip-level equalisation in the embodiment of the invention;
Fig. 6 is the H matrix schematic diagram that generates in the chip-level equalisation process shown in Figure 5;
Fig. 7 is the C matrix schematic diagram that generates in the chip-level equalisation process shown in Figure 5;
Fig. 8 is a kind of structural representation of embodiment of the invention multicast single-frequency network received signal checkout equipment;
Fig. 9 is the another kind of structural representation of embodiment of the invention multicast single-frequency network received signal checkout equipment.
Embodiment
In order to make those skilled in the art person understand the scheme of the embodiment of the invention better, the embodiment of the invention is described in further detail below in conjunction with drawings and embodiments.
As shown in Figure 3, be TD-SCDMA MBSFN structure of time slot schematic diagram.
The length of a MBSFN time slot is 864*Tc, and wherein Tc is the length of a chip.Targeting sequencing takies 96 chips, and data symbol partly takies 768 chips.
In MBSFN, signal transmits on independent carrier wave, and because to full Cell Broadcast CB, sends signal and without wave beam forming, therefore, at each UE, all code channels have passed through identical channel.Because before signal sent, different code channels had used different orthogonal intersections, the complete quadrature of the data symbol between each code channel.Because influencing between each code channel of multipath channel can produce interference, disturbs if can eliminate multipath, just can recover the orthogonality between code channel, and then recover the data symbol of each code channel.Because channel can be expressed as linear transformation usually to the influence of signal, is embodied on chip (chip) signal, each code channel data has experienced identical linear transformation.
This specific character based on above-mentioned MBSFN, embodiment of the invention multicast single-frequency network received signal detection method and equipment, when detecting to received signal, the influence of spread spectrum and the influence of channel are handled respectively, multipath channel is carried out the equilibrium of chip-level, eliminate the interference between code channel, the chip data after the equilibrium are carried out despreading, recover the data symbol of transmission.As shown in Figure 4, be the realization flow figure of embodiment of the invention multicast single-frequency network received signal detection method, may further comprise the steps:
The specific implementation process of above-mentioned two steps can adopt the mode identical with prior art, can carry out channel estimating according to described homing sequence earlier, eliminate the interference that described homing sequence produces according to channel estimation results from described general data, detailed process repeats no more.
In above-mentioned steps 403, need carry out chip-level equalisation to eliminating data after interference, be meant and consider all code channels are unified.In specific implementation, can realize in time domain, such as adopting the block balance algorithm, perhaps adopt other algorithms such as linear filtering etc.; Also can realize at frequency domain; Balanced criterion can adopt ZF (ZF), MMSE (least mean-square error) etc.
As shown in Figure 5, be the principle schematic that realizes chip-level equalisation in the embodiment of the invention.
Wherein, d
(k)The data symbol vector of representing k code channel, c
(k)The spreading code of representing k code channel correspondence, h are represented the channel impulse response vector of each code channel correspondence, and n represents noise,
Represent the estimation of k code channel data symbol, e is through the reception vector behind the channel.H represents the channel matrix be made up of channel impulse response vector h, and H is made of according to mode as shown in Figure 6 h:
Received signal e and matrix H, transmission data d, noise n have following relation:
e＝HCd+n； (1)
Wherein,
K is the code channel sum, and N is the data symbol number of each code channel;
C is made up of each code channel spreading code, the composition of C as shown in Figure 7:
Wherein, Q is 16, since mutually orthogonal between the spreading code, thereby C is arranged
HC=I, I are unit matrix.Cd is designated as d
cAs long as then recover d
cEstimated value
, just can obtain sending the estimated value of symbol easily
Typically,
Can obtain by chip-level equalisation,, following expression formula be arranged for example for the MMSE block balance:
Wherein, σ
2Be noise variance.
In embodiments of the present invention, the generation of equalizing coefficient can have several different methods.Such as, can calculate equalizing coefficient according to channel estimation results, and can generate different equalizing coefficients at different optimization criterions.For example, for the MMSE block balance, the equalizing coefficient of generation is (H as the aforementioned
HH+ σ
2I)
-1H
HOther commonly used equalization methods adopts the ZF equalizer, MMSE equalizer of transverse filter structure etc. in addition.
As seen, embodiment of the invention multicast single-frequency network received signal detection method, when detecting to received signal, the influence of spread spectrum and the influence of channel are handled respectively, multipath channel is carried out the equilibrium of chip-level, eliminate the interference between code channel, the chip data after the equilibrium are carried out despreading, recover the data symbol of transmission.Thereby need not to detect activated code channel, improved the detection performance; And, be convenient to optimize and reduced amount of calculation with channel and spread spectrum difference individual processing.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
The embodiment of the invention also provides a kind of multicast single-frequency network received signal checkout equipment, as shown in Figure 8, is a kind of structural representation of this equipment.
In this embodiment, described equipment comprises: data separating unit 801, interference cancellation unit 802, balanced unit 803 and despread unit 804.Wherein:
Data separating unit 801 is used for extracting homing sequence and general data respectively from received signal;
Interference cancellation unit 802 is used for eliminating the interference that described homing sequence produces from described general data;
Balanced unit 803 is used for carrying out chip-level equalisation to eliminating data after interference;
Despread unit 804 is used for balanced data is carried out despreading, obtains the estimated value of each code channel data symbol.
In embodiments of the present invention, 803 pairs of described balanced units are eliminated the specific implementation that data after interference is carried out chip-level equalisation, can be to realize in time domain, such as adopting the block balance algorithm, perhaps adopt other algorithms such as linear filtering etc.; Also can realize at frequency domain; Balanced criterion can adopt ZF, MMSE etc.
Optimization criterion at different can adopt different equalizing coefficients.Described equalizing coefficient can be a default value, also can be generated by other modes.
As shown in Figure 9, be the another kind of structural representation of embodiment of the invention multicast single-frequency network received signal checkout equipment.
In this embodiment, described equipment not only comprises with embodiment illustrated in fig. 8 consistent: data separating unit 901, interference cancellation unit 902, balanced unit 903 and despread unit 904, but also comprise channel estimating unit 905 and equalizing coefficient generation unit 906.
It is as follows to utilize embodiment of the invention multicast single-frequency network received signal checkout equipment to carry out the process of input:
The signal that receives is through data separating unit 901, isolate homing sequence and general data, channel estimating unit 905 is carried out channel estimating according to described homing sequence, and equalizing coefficient generation unit 906 generates equalizing coefficient according to the channel estimation results of described channel estimating unit 905 outputs.
In embodiments of the present invention, described equalizing coefficient is generated according to channel estimation results by equalizing coefficient generation unit 906.The embodiment of the invention is not limited in this generating mode, can also adopt other modes to generate corresponding equalizing coefficient.
Embodiment of the invention multicast single-frequency network received signal checkout equipment, when detecting to received signal, the influence of spread spectrum and the influence of channel are handled respectively, multipath channel is carried out the equilibrium of chip-level, eliminate the interference between code channel, chip data after the equilibrium are carried out despreading, recover the data symbol of transmission.Thereby need not to detect activated code channel, improved the detection performance; And, be convenient to optimize and reduced amount of calculation with channel and spread spectrum difference individual processing.
Need to prove that embodiment of the invention multicast single-frequency network received signal detection method and equipment are not only applicable to TD-SCDMA MBSFN system, and be equally applicable to the TDD MBSFN system of 3.84Mcps (million cycle per seconds) and 7.68Mcps.
Embodiment of the invention multicast single-frequency network received signal checkout equipment, when detecting to received signal, the influence of spread spectrum and the influence of channel are handled respectively, multipath channel is carried out the equilibrium of chip-level, eliminate the interference between code channel, chip data after the equilibrium are carried out despreading, recover the data symbol of transmission.Thereby need not to detect activated code channel, improved the detection performance; And, be convenient to optimize and reduced amount of calculation with channel and spread spectrum difference individual processing.
More than the embodiment of the invention is described in detail, used embodiment herein the present invention set forth, the explanation of above embodiment just is used for help understanding method and apparatus of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a multicast single-frequency network received signal detection method is characterized in that, comprising:
From received signal, extract homing sequence and general data respectively;
From described general data, eliminate the interference that described homing sequence produces;
Carry out chip-level equalisation to eliminating data after interference;
Balanced data is carried out despreading, obtain the estimated value of each code channel data symbol.
2. method according to claim 1 is characterized in that, described method also comprises: generate equalizing coefficient;
Describedly carry out chip-level equalisation and comprise eliminating data after interference:
Utilize described equalizing coefficient to carry out chip-level equalisation to eliminating data after interference.
3. method according to claim 2 is characterized in that, described method also comprises: carry out channel estimating according to described homing sequence, and generate described equalizing coefficient according to channel estimation results.
4. method according to claim 1 is characterized in that,
Carry out described chip-level equalisation in time domain; Perhaps
Carry out described chip-level equalisation at frequency domain.
5. method according to claim 4 is characterized in that, describedly carries out chip-level equalisation in time domain and comprises:
Adopt the block balance algorithm to carry out chip-level equalisation in time domain; Perhaps
Adopt the linear filtering algorithm to carry out chip-level equalisation in time domain.
6. method according to claim 1 is characterized in that, describedly balanced data is carried out despreading comprises:
Use fast hadamard transform FHT that balanced data is carried out despreading.
7. a multicast single-frequency network received signal checkout equipment is characterized in that, comprising:
The data separating unit is used for extracting homing sequence and general data respectively from received signal;
Interference cancellation unit is used for eliminating the interference that described homing sequence produces from described general data;
Balanced unit is used for carrying out chip-level equalisation to eliminating data after interference;
Despread unit is used for balanced data is carried out despreading, obtains the estimated value of each code channel data symbol.
8. equipment according to claim 7 is characterized in that, described equipment also comprises:
The equalizing coefficient generation unit is used to generate equalizing coefficient;
Described balanced unit utilizes described equalizing coefficient to carry out chip-level equalisation to eliminating data after interference.
9. equipment according to claim 8 is characterized in that, described equipment also comprises:
Channel estimating unit is used for carrying out channel estimating according to described homing sequence;
Described equalizing coefficient generation unit generates described equalizing coefficient according to the channel estimation results of described channel estimating unit output.
10. method according to claim 7 is characterized in that, described despread unit uses fast hadamard transform FHT that balanced data is carried out despreading.
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| CN110690970A (en) * | 2018-07-06 | 2020-01-14 | 华为技术有限公司 | Data processing method, device and equipment |
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| CN101212235A (en) * | 2007-12-24 | 2008-07-02 | 北京邮电大学 | Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm |
| CN101272159A (en) * | 2008-03-31 | 2008-09-24 | 北京天碁科技有限公司 | Receiver based on equalization technology and receiving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101212235A (en) * | 2007-12-24 | 2008-07-02 | 北京邮电大学 | Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm |
| CN101272159A (en) * | 2008-03-31 | 2008-09-24 | 北京天碁科技有限公司 | Receiver based on equalization technology and receiving method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110690970A (en) * | 2018-07-06 | 2020-01-14 | 华为技术有限公司 | Data processing method, device and equipment |
| CN110690970B (en) * | 2018-07-06 | 2021-11-19 | 华为技术有限公司 | Data processing method, device and equipment |
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Application publication date: 20101201 |