CN101267585B - Method and receiving device for TD-SCDMA system to send and receiving broadcast service - Google Patents
Method and receiving device for TD-SCDMA system to send and receiving broadcast service Download PDFInfo
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- CN101267585B CN101267585B CN2007100381535A CN200710038153A CN101267585B CN 101267585 B CN101267585 B CN 101267585B CN 2007100381535 A CN2007100381535 A CN 2007100381535A CN 200710038153 A CN200710038153 A CN 200710038153A CN 101267585 B CN101267585 B CN 101267585B
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Abstract
The invention discloses a method for transmitting and receiving broadcast services in a TD-SCDMA system, and a receiving device. The transmitting method is a method using one or more time slots of the TD-SCDMA system to send the broad cast services, data resource sequences transmitted by a base station which sends a same broadcast service are same with each other and are transmitted synchronously. The user terminal receiving method is a method for performing channel estimation based on received signals to obtain a channel impulse response sequence corresponding to each base station group, convoluting the channel impulse response sequence with a composite spread spectrum code sequence of each base station group to form a V matrix, and estimating an original information symbol sequence by a combination detection algorithm. The receiving device includes a data dividing unit which divides the received signals, an intermediate code interference cancellation unit which cancels the interference of intermediate code interferences on the data symbols, and the combination detection unit which performs estimation of the transmitted data symbols.
Description
Technical field
The present invention relates to the digital mobile communication field, particularly relate to a kind of method that sends broadcasting service based on TD-SCDMA (TD SDMA) system.The invention still further relates to based on the method for TD-SCDMA system user terminal receiving broadcast service and the receiving system of user terminal.
Background technology
At present, people no longer are satisfied with phone and messaging service to the demand of mobile communication, and a large amount of multimedia services emerge, and wherein television broadcasting even interactive television are one of interested application of people.
Because 3-G (Generation Three mobile communication system) (3G) can provide the speed higher than 2G/2.5G system, the service supporting capacity of the availability of frequency spectrum, therefore, the commercialization of 3G technology has brought further opportunity to develop to mobile communication, for the development mobile phone TV services provide the network platform.
The TD-SCDMA system is one of existing three big 3G standards, and TD-SCDMA adopts TDD (time division duplex) mode, only needs a cover radio-frequency apparatus, makes that the cost of system equipment is lower than the 3G system (as WCDMA and CDMA2000 etc.) of FDD (Frequency Division Duplexing (FDD)) mode.Adopt the multi-access mode of sign indicating number branch+time-division, used key technologies such as joint-detection, smart antenna, the system that makes has the high characteristics of spectrum efficiency, becomes the focus of research in recent years in China.
The subframe structure of TD-SCDMA as shown in Figure 1, a subframe is by 7 conventional time slots, 2 special time slots and some protections (GP) at interval constitute.Conventional structure of time slot as shown in Figure 3, a conventional time slot is L by two segment length
1The data symbol of chip, length are L
2The intermediate code of chip and length are L
3The protection of chip is formed at interval, and total length is 864 chips.Wherein, intermediate code is L by length again
3The Cyclic Prefix of chip and length are L
4The training sequence of chip is formed, the back L of Cyclic Prefix and training sequence
3Individual chip is identical.Special time slot comprises descending pilot frequency time slot (DwPTS, 96 chips) and uplink pilot time slot (UpPTS, 160 chips), and it is synchronous to be respectively applied for up-downgoing.
Each conventional time slot adopts the mode of code division multiple access (CDMA) to be divided into several Code Channels.In addition, in the network of reality, a plurality of frequencies can also be used in a sub-district, and therefore, the physical channel of TD-SCDMA system can be expressed as＜frequency, time slot, spreading code〉form, physical channel is used to carry user's business.Each user terminal receives or sends data for its physical channel by system assignment.
In the existing TD-SCDMA system, when needs sent downlink service data to user terminal, system distributed some physical channels to user terminal, then Data-carrying was sent to user terminal on these physical channels.When using existing TD-SCDMA system to send broadcasting service, system set up different physical channels need for different user terminals, sends respectively then, and therefore, when existing TD-SCDMA system sent broadcasting service, its efficient was very low.Because the physical channel of system is limited, therefore, existing TD-SCDMA system synchronization can only be supported quite limited number of users.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method based on TD-SCDMA system transmission broadcasting service, and the efficient when sending broadcasting service to improve the TD-SCDMA system is saved the frequency spectrum resource of system; For this reason, the present invention also will provide a kind of based on the method for TD-SCDMA system user terminal receiving broadcast service and the receiving system of user terminal.
For solving the problems of the technologies described above, method based on TD-SCDMA system transmission broadcasting service of the present invention is to adopt following technical scheme to realize, utilize 1 or a plurality of time slot of TD-SCDMA system to send broadcasting service, wherein, the data source sequence that the base station of the same broadcasting service of participation transmission sends is identical, and synchronized transmission.
Method based on TD-SCDMA system user terminal receiving broadcast service of the present invention is, user terminal carries out channel estimating according to the signal that receives, obtain each group of base stations channel impulse response sequence corresponding with himself, the compound spread spectrum code sequence of this channel impulse response sequence and each group of base stations is carried out convolution, structure V matrix adopts joint detection algorithm estimation raw information symbol sebolic addressing.
Device based on TD-SCDMA system user terminal receiving broadcast service of the present invention comprises data partitioning unit, intermediate code interference cancellation unit, channel estimating unit, joint-detection unit;
Described data partitioning unit is finished cutting apart to received signal, and the first segment data symbol is added Cyclic Prefix L altogether
1+ L
3Individual chip, the second segment data symbol add protection and are total to L at interval
1+ L
3Individual chip is delivered to intermediate code interference cancellation unit; Training sequence is total to L
4Individual chip is delivered to channel estimating unit;
Described intermediate code interference cancellation unit falls the interference cancellation of intermediate code to the data symbolic component, and outputs to the joint-detection unit based on the output of channel estimating unit and the basic midamble code of each base station;
Described joint-detection unit is finished sending the estimation of data symbol based on the output of channel estimating unit and intermediate code interference cancellation unit.
The present invention can effectively improve the efficient that existing TD-SCDMA system sends broadcasting service.Use conventional methods and broadcast, need set up physical channel respectively, mean that each user monopolizes running time-frequency resource each user.And adopt method of the present invention, and can be so that the user of a plurality of receiving broadcast services shares same physical channel, thus the efficient that system sends broadcasting service improved.In addition, among the present invention, because the signal that terminal receives can obtain diversity gain for the stack from a plurality of base stations, therefore, compared with prior art, the present invention can reduce the transmitting power of base station.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the subframe structure schematic diagram of TD-SCDMA;
Fig. 2 is that the base station that will participate in the transmission broadcast singal is divided into M the schematic diagram of organizing;
Fig. 3 is the conventional structure of time slot schematic diagram shown in Fig. 1;
Fig. 4 is a user terminal receiving system theory diagram of the present invention.
Embodiment
Of the present inventionly send the method for broadcasting service based on the TD-SCDMA system, use one or more time slot of existing TD-SCDMA system to send broadcasting service, for sake of convenience, the time slot that will be used to send broadcasting service is called time slot.The base station that participates in the transmission broadcast singal is divided into M group, and M is the integer more than or equal to 1, and the number of base stations of each group can be the same or different.Here, the base station is divided into just notion in logic of M group, rather than geographic notion.Two adjacent base stations can belong to same group, also can belong to different groups, and the base station far away that is separated by on the geography also can belong to same group.Figure 2 shows that the situation of M=3, base station 11 and 12 constitutes the 1st group, and base station 21,22 and 23 constitutes the 2nd group, and base station 31,32,33 and 34 constitutes the 3rd group.
For same broadcasting service, it is identical to belong to the physical channel parameters that its time slot of base station of same group uses, and it is also identical to be used for the intermediate code sequence of channel estimating; Belong to not the physical channel parameters difference that use at time slot two base stations on the same group, the intermediate code sequence is also different.Physical channel parameters described here is＜frequency time slot, spreading code〉combination that constitutes, wherein, spreading code refers to a multiple sign indicating number sequence, such as, can be the Orthogonal Variable Spreading Factor OVSF (OVSF) of sub-district and the compound spreading code of scrambler formation.Belonging to not the intermediate code of using base station on the same group can construct through cyclic shift based on same basic midamble code, also can construct based on different basic midamble codes.
For same broadcasting service, the data source sequence that each base station of participation broadcasting service sends is identical, and synchronized transmission.Here the data source sequence of indication refers to the information data symbol sebolic addressing that the base station sends synchronously and sends at one time.There are a lot of methods can realize that base station synchronization sends data, such as, a kind of implementation method is to use GPS (global positioning system) system, increases timestamp simultaneously on packet, allows each base station according to the time of appointment on the timestamp packet be sent then.
After the base station sends data, be positioned at signal that the user terminal of radio network coverage receives and participate in the stack of signal of the base station of broadcasting for all.According to noted earlier, the data source sequence that all base stations send is identical, but because different spreading codes is used in the base station that belongs to not on the same group, and therefore, it is different belonging to not the physical signalling that base station on the same group sends.The unified M that is divided into altogether that sets up departments organizes, and the received signal of user terminal can be expressed as so:
Wherein
The compound spread spectrum code sequence of representing k code channel of m sub-district, h
M, kThe signal shock response sequence of representing k the compound channel that code channel experienced of m sub-district, * represents convolution,
Represent the sequence that the convolution sum of the compound spreading code of all k code channels in sub-district and k the compound channel that code channel experienced constitutes, d
K, nRepresent n symbol of k code channel, n represents noise vector, and Q represents spreading factor, and K represents code channel number, and N represents symbolic number.
After user terminal receives signal, at first from received signal, isolate intermediate code and carry out channel estimating, obtain h with relevant part
M, k(m=1,2 ..., M; K=1,2 ..., K), if when same base station being set during system configuration sending broadcasting service, each code channel of same time slot uses same intermediate code sequence, then h
M, 1=h
M, 2=...=h
M, K=h
m, at this moment, for each group, user terminal only need estimate that the channel impulse response of 1 channel gets final product.Which intermediate code is system used on earth, and use any mode to distribute intermediate code, user terminal can be known by the mode of coupling, also can inform by system broadcast message, and the method for employing system broadcast message can significantly reduce the amount of calculation of user terminal.
Particularly, adopt under the situation of the still different intermediate code skew of identical basic midamble code in the common midamble method of salary distribution and each base station, user terminal can adopt traditional Steiner estimator when carrying out channel estimating, obtain h
M, kEstimation; Adopt in each base station under the situation of different basic midamble codes, can adopt the multi-plot joint channel estimating, obtain h
M, kEstimation.
The compound spread spectrum code sequence c that each group of base stations is used
M, kCan calculate by basic midamble code's sequence of 3GPP agreement regulation and corresponding relation around sign indicating number.
User terminal is according to the compound spread spectrum code sequence c that calculates
M, k, with and the channel estimation results h of each group of base stations of estimating according to received signal
M, k, just can calculate respectively being listed as of V matrix, calculate after the V matrix, use joint-detection (JD) algorithm just can obtain information sequence d
K, n
Because the columns of transmission matrix T and base station number M are irrelevant, therefore, to compare with common joint-detection, the increase of complexity only shows to be needed when forming T to calculate
Therefore the computation complexity of T is original M times, but because calculating T matrix is the very little part of amount of calculation in the joint detection algorithm, so the increase of these amounts of calculation can be ignored.
Because following formula has comprised the wireless channel of all signal of base station and their experience, therefore can obtain the diversity gain of rake and/or grand diversity.
As shown in Figure 4, the device based on TD-SCDMA system user terminal receiving broadcast service of the present invention comprises data partitioning unit, intermediate code interference cancellation unit, channel estimating unit, joint-detection unit.
Data partitioning unit is finished cutting apart to received signal, and promptly the first segment data symbol adds that Cyclic Prefix has L altogether
1+ L
3Individual chip, the second segment data symbol add that protection has L at interval altogether
1+ L
3Individual chip is delivered to intermediate code interference cancellation unit, and training sequence has L altogether
4Individual chip is delivered to channel estimating unit.
In intermediate code Interference Cancellation unit,, the interference cancellation of intermediate code to the data symbolic component fallen, and output to the joint-detection unit based on the output of channel estimating and the basic midamble code of each sub-district.
In the joint-detection unit, based on the output of channel estimating unit and the output of intermediate code Interference Cancellation unit, to finish sending the estimation of data symbol, estimation criterion can adopt least square criterion or minimum mean square error criterion.
Minimize the Euclidean norm of evaluated error
Can obtain least square (LS, Least Square) separate into
‖ ‖ wherein
2Expression Eucl idean norm,
Expression is to the estimation of data symbol d,
HThe expression complex-conjugate transpose,
-1The expression inverse matrix.
Minimize mean square error
Can obtain least mean-square error (MMSE, MinimumMean Square Error) separate into
Wherein E{} represents mathematic expectaion,
Expression is to data symbol d
K, nEstimation, σ
2The expression noise variance, I representation unit battle array.
The output of joint-detection unit, the i.e. estimation of data symbol
Deliver to the unit such as demodulation, decoding of back and do further processing.
The present invention can distribute 1 or a plurality of descending time slot to be used for television broadcasting in based on the television broadcasting system of TD-SCDMA, perhaps increases by 1 or a plurality of auxilliary frequency and carry visual broadcast service in existing TD-SCDMA system.
When divided into groups in the base station, M=2 can be set, can reduce the amount of calculation of terminal like this.
Claims (7)
1. the method based on TD-SCDMA system transmission broadcasting service utilizes 1 or a plurality of time slot of TD-SCDMA system to send broadcasting service, it is characterized in that: the data source sequence that the base station of the same broadcasting service of participation transmission sends is identical, and synchronized transmission;
The base station that described participation sends same broadcasting service is divided into 1 or a plurality of groups, same group the same physical channel parameters of all base station configuration, and it is identical to be used for the intermediate code sequence of channel estimating; Do not dispose different physical channel parameters between two base stations on the same group, and be used for the intermediate code sequence difference of channel estimating.
2. the method based on TD-SCDMA system transmission broadcasting service according to claim 1, it is characterized in that: it is 2 groups that described base station is divided into a plurality of groups, and the base station number of each group is identical or different.
3. the method that sends broadcasting service based on the TD-SCDMA system according to claim 1 is characterized in that: described physical channel parameters is the combination of frequency, time slot, spreading code formation.
4. the method that sends broadcasting service based on the TD-SCDMA system according to claim 1, it is characterized in that: the intermediate code of base station use is not on the same group constructed through cyclic shift based on same basic midamble code, or constructs based on different basic midamble codes.
5. one kind receives method as any one described broadcasting service of claim 1 to 4 based on the TD-SCDMA system user terminal, it is characterized in that: user terminal carries out channel estimating according to the signal that receives, obtain each group of base stations channel impulse response sequence corresponding with himself, the compound spread spectrum code sequence of this channel impulse response sequence and each group of base stations is carried out convolution, structure V matrix adopts joint detection algorithm estimation raw information symbol sebolic addressing.
6. one kind receives device as any one described broadcasting service of claim 1 to 4 based on the TD-SCDMA system user terminal, comprises data partitioning unit, intermediate code interference cancellation unit, channel estimating unit, joint-detection unit, it is characterized in that:
Described data partitioning unit is finished cutting apart to received signal, and the first segment data symbol is added the received signal of Cyclic Prefix correspondence, and the second segment data symbol adds the corresponding at interval received signal of protection and delivers to intermediate code interference cancellation unit; The received signal of training sequence correspondence is delivered to channel estimating unit;
Described intermediate code interference cancellation unit falls the interference cancellation of intermediate code to the data symbolic component, and outputs to the joint-detection unit based on the output of channel estimating unit and the basic midamble code of each base station;
Described joint-detection unit is finished sending the estimation of data symbol based on the output of channel estimating unit and intermediate code interference cancellation unit.
7. the device based on TD-SCDMA system user terminal receiving broadcast service according to claim 6 is characterized in that: the criterion that described joint-detection unit is estimated adopts least square criterion or minimum mean square error criterion.
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| CN102739282B (en) * | 2011-04-02 | 2015-02-04 | 联芯科技有限公司 | Multi-antenna combined detection system of TD-SCDMA system and multi-antenna combined detection method thereof |
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| CN1716817A (en) * | 2004-06-30 | 2006-01-04 | 西门子（中国）有限公司 | Method for realizing user's equipment downward synchronization in TD-SCDMA mobile communication system |
| CN1905398A (en) * | 2005-07-27 | 2007-01-31 | 上海原动力通信科技有限公司 | Broadcasting/multicasting service transmitting method for TDD system |
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| CN1716817A (en) * | 2004-06-30 | 2006-01-04 | 西门子（中国）有限公司 | Method for realizing user's equipment downward synchronization in TD-SCDMA mobile communication system |
| CN1905398A (en) * | 2005-07-27 | 2007-01-31 | 上海原动力通信科技有限公司 | Broadcasting/multicasting service transmitting method for TDD system |
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Application publication date: 20080917 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinji Lease (Tianjin) Co.,Ltd. Contract record no.: 2018990000196 Denomination of invention: Method and receiving device for TD-SCDMA system to send and receiving broadcast service Granted publication date: 20110126 License type: Exclusive License Record date: 20180801 |
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Effective date of registration: 20221019 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 300456 1-1-1802-7, north area of financial and Trade Center, No. 6865, Asia Road, Tianjin pilot free trade zone (Dongjiang Bonded Port Area) Patentee before: Xinji Lease (Tianjin) Co.,Ltd. |