CN101959130B - Method and device for improving system performance of multi-media broadcast over a single frequency network (MBSFN) system - Google Patents
Method and device for improving system performance of multi-media broadcast over a single frequency network (MBSFN) system Download PDFInfo
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- CN101959130B CN101959130B CN 200910055041 CN200910055041A CN101959130B CN 101959130 B CN101959130 B CN 101959130B CN 200910055041 CN200910055041 CN 200910055041 CN 200910055041 A CN200910055041 A CN 200910055041A CN 101959130 B CN101959130 B CN 101959130B
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Abstract
The invention discloses a method and a device for improving system performance of a multi-media broadcast over a single frequency network (MBSFN) system. The method comprises the following steps of: receiving data of the current time slot and Preamble codes of the next time slot when service data are sent in the next time slot; estimating channels by using the Preamble codes of the current time slot and the Preamble codes of the next time slot respectively so as to acquire a first channel estimation result and a second channel estimation result; dividing the received data into a front block and a rear block; and demodulating the front block data by using the first channel estimation result, and demodulating the rear block data by using the second channel estimation result. The method and the device can improve the accuracy of channel estimation and improve the performance of the system.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method and apparatus that improves systematic function in a kind of MBSFN system.
Background technology
At present; Multicast Broadcast Single Frequency Network (MBSFN; Multicast Broadcast Single FrequencyNetwork) uses the Preamble sign indicating number in the current time slots to carry out channel estimating in the system, then the result of channel estimating is applied to data division and carries out data demodulates.
Yet under high-speed mobile environment, because the channel circumstance more complicated of MBSFN system, the influence of the multipath channel that additive noise in the channel and high-speed mobile cause can make channel variation very big.When the latter half that the channel estimation results that therefore only uses the Preamble sign indicating number of current time slots to carry out in the prior art is applied to data carries out data demodulates; Can not truly reflect the multipath effect that data are actual; Obviously; The demodulation performance of latter half data can receive very big influence, and then can cause the poor-performing of system.
Summary of the invention
The embodiment of the invention provides the method and apparatus that improves systematic function in a kind of MBSFN system, can improve the accuracy of channel estimating, significantly improves the performance of system.
The embodiment of the invention provides following technical scheme:
Improve the method for systematic function in a kind of MBSFN system, comprising:
When a time slot has business datum to send instantly, receive the Preamble sign indicating number of current time slots data and next time slot;
Use the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating respectively, obtain first channel estimation results and second channel estimated result;
The said data that receive are divided into two of front and back, utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilize said second channel estimated result that the back blocks of data is carried out demodulation.
Preferably, said method also comprises: two blocks of data of the front and back after the demodulation are merged.
Preferably, if the said data that receive are divided into two of nonoverlapping front and back, then two blocks of data of the front and back after the demodulation are merged the power that the power that comprises the back blocks of data is adjusted into preceding blocks of data.
Preferably; If the said data that receive are divided into two of overlapping front and back; Then two overlapped data in the front and back after the demodulation are merged the power that the power that comprises the back blocks of data is adjusted into preceding blocks of data, adopt linear averaging act of union or power ratio act of union to merge.
Preferably, said method also comprises:
Judge whether next time slot has business datum to send.
Meanwhile, the present invention also provides the device that improves systematic function in a kind of MBSFN system, comprising:
The Data Receiving unit is used to receive the Preamble sign indicating number of current time slots data and next time slot;
Channel estimating unit is used for using respectively the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating, obtains first channel estimation results and second channel estimated result;
Data partitioning unit is used for the said data that receive are divided into two of front and back;
Data demodulation unit is used to utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilizes said second channel estimated result that the back blocks of data is carried out demodulation.
Preferably, said device also comprises:
Merge processing unit, be used for two blocks of data of the front and back after the demodulation are merged.
Preferably, if said data partitioning unit is divided into two of nonoverlapping front and back with data, then said merging processing unit is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and two blocks of data of the front and back after the demodulation are merged.
Preferably, if said data partitioning unit is divided into two of overlapping front and back with data, then said merging processing unit is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and adopts linear averaging act of union or power ratio act of union to merge.
Preferably, said device also comprises:
Judge indicating member, be used to judge whether next time slot has business datum to send, and when judging that next time slot has business datum to send, the designation data receiving element receives data.
Preferably, said device is the terminal, perhaps is a functional entity in the terminal.
Improve the method and apparatus of systematic function in a kind of MBSFN system that the embodiment of the invention provides; Carry out the situation of channel estimating based on the Preamble sign indicating number that only uses current time slots in the prior art; Proposed under high-speed mobile environment; And when all there is MBMS broadcasting in current time slots with next time slot, use the Preamble sign indicating number of current time slots and next time slot Preamble sign indicating number to carry out channel estimating respectively, then with the data division separated into two parts; The data first half uses the channel estimation results of the Preamble sign indicating number of current time slots to carry out data demodulates, and the data latter half uses the channel estimation results of next time slot Preamble sign indicating number to carry out demodulation.Because front and back two parts data have all used the channel estimation results of nearer Preamble sign indicating number to carry out demodulation, thereby can avoid current time slots Preamble sign indicating number to be applied to the problem that data latter half data are carried out the demodulation performance difference effectively.In a word; The channel estimation results of next time slot Preamble sign indicating number of the actual multi-path environment of the present invention through will be more embodying the rear section data; Be applied in the demodulating process of rear section data; Make its demodulation performance be improved, and then make the performance that merges the back data also be improved, thereby make the performance of system obtain bigger improvement and raising.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the time slot format structural representation of MBSFN system in the prior art;
Fig. 2 is the method overview flow chart that the embodiment of the invention improves systematic function;
Fig. 3 is the method particular flow sheet that the embodiment of the invention improves systematic function;
Fig. 4 is the device summary structural representation that the embodiment of the invention improves systematic function;
Fig. 5 is the device concrete structure sketch map that the embodiment of the invention improves systematic function;
Fig. 6 is another concrete structure sketch map of device that the embodiment of the invention improves systematic function.
Embodiment
The embodiment of the invention provides the method and apparatus that improves systematic function in a kind of MBSFN system, can improve the accuracy of channel estimating, significantly improves the performance of system.For making the object of the invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is to further explain of the present invention.
As shown in Figure 1, be SFN frame slot structural representation in the prior art, it is made up of Preamble sign indicating number and data-signal (data).The data of current time slots are between the Preamble of the Preamble of current time slots sign indicating number and next time slot sign indicating number under Single Frequency Network (SFN, Single Frequency Network) mode.All there is multi-media broadcasting service (MBMS in current time slots and next time slot; MultimediaBroadcast Multicast Service) time; The present invention uses the Preamble sign indicating number of current time slots and next time slot Preamble sign indicating number to carry out channel estimating respectively; Then data are divided into two of front and back; Preceding blocks of data uses the channel estimation results of the Preamble sign indicating number of current time slots to carry out data demodulates, and back blocks of data uses the channel estimation results of the Preamble sign indicating number of next time slot to carry out data demodulates, at last two parts data is merged; Under the environment of high-speed mobile, the channel estimation results of the Preamble sign indicating number in each blocks of data can correctly reflect the multipath situation of data like this.Utilize this method can avoid current time slots Preamble sign indicating number to be applied to the problem that the demodulation performance difference is carried out in the data rear section effectively, and the demodulation of rear section data is greatly improved on performance, and then significantly improve the performance of system.
As shown in Figure 2, improve the method overview flow chart of systematic function in the MBSFN system that provides for the embodiment of the invention.Said method comprises:
Particularly, receiver side can judge further whether next time slot has business datum to send, for example can be according to multiple spot control channel (MCCH; Multipoint Control CHannel) confirms whether next time slot exists multi-media broadcasting service (MBMS; Multimedia Broadcasting Multicast Service), if do not exist, then user side uses the method for single time slot channel estimating; If exist, then user side receives the Preamble sign indicating number of current time slots data and next time slot.
Need to prove that the said method flow process can further include: two blocks of data of the front and back after the demodulation are merged.Particularly, if the said data that receive are divided into two of nonoverlapping front and back, then two blocks of data of the front and back after the demodulation are merged the power that the power that comprises the back blocks of data is adjusted into preceding blocks of data.If the said data that receive are divided into two of overlapping front and back, then two overlapped data in the front and back after the demodulation are merged the power that the power that comprises the back blocks of data is adjusted into preceding blocks of data, adopt linear averaging act of union or power ratio act of union to merge.
Therefore; Pass through said method; Under high-speed mobile environment; Because the data separated into two parts of a time slot and the channel estimation results of Preamble sign indicating number of using Preamble sign indicating number and next time slot of current time slots are respectively carried out data demodulates; Make the channel estimation results of the Preamble sign indicating number in every partial data can both reflect the influence of the actual multi-path environment of data preferably, therefore can avoid the channel estimation results of the Preamble sign indicating number of the current time slots that high-speed mobile causes to be applied to the bad problem of demodulation performance of current time slots rear section data.By this method, can improve the demodulation performance of rear section data, and then improve the performance of system.
As shown in Figure 3, improve the method particular flow sheet of systematic function in the MBSFN system that provides for the embodiment of the invention.Said method specifically comprises:
Need to prove, because the multiple channel estimation methods that the present invention can use prior art to provide when carrying out channel estimating, for example correlation technique, LS method, FFT method etc., the present invention does not carry out too much description to the specific algorithm of these channel estimating.
Need to prove that the method for partition to data in the said step 303 has a lot, for example can use direct method of partition, be about to data and be divided into two of front and back that the length of two blocks of data can equate, also can not wait.Can also use overlapping method of partition, be about to data and be divided into two, but two blocks of data overlap.
In addition, need to prove also that the several different methods that can use prior art to provide when carrying out data demodulates owing to the present invention is not so the present invention does too much introduction to the concrete grammar of demodulation.
Need to prove; The mode that in the said step 304 data block 1 and data block 2 is merged can have a lot, for example, data is adopted the situation of direct piecemeal; It is identical with the power of preceding blocks of data to adopt elder generation that the power of back blocks of data is adjusted to, and then merges.Data are adopted the situation of overlapping piecemeal, can earlier the power of back blocks of data be adjusted to identically earlier, adopt linear averaging act of union or power ratio act of union to merge then with the power of preceding blocks of data.
As shown in Figure 4, improve the device generality structural representation of systematic function in the MBSFN system that provides for the embodiment of the invention.This device comprises: Data Receiving unit 410, channel estimating unit 420, data partitioning unit 430, data demodulation unit 440; Wherein:
Said Data Receiving unit 410 is used to receive the Preamble sign indicating number of current time slots data and next time slot;
Said channel estimating unit 420 is used for using respectively the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating, obtains first channel estimation results and second channel estimated result;
Said data partitioning unit 430 is used for the said data that receive are divided into two of front and back;
Said data demodulation unit 440 is used to utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilizes said second channel estimated result that the back blocks of data is carried out demodulation.
Therefore; Said apparatus is under high-speed mobile environment; When all there are MBMS broadcasting in current time slots and next time slot; Owing to the basic Preamble sign indicating number that uses in two time slots is identical; And between the Preamble of the Preamble of current time slots sign indicating number and next time slot sign indicating number, because nearer from the Preamble sign indicating number of next time slot, the channel estimation results of the Preamble sign indicating number of next time slot can reflect the true environment situation of rear section data preferably like this for current time slots rear section data in data under the SFN mode.Therefore; In high-speed mobile environment; The forward part that can use the channel estimation results of the Preamble sign indicating number of current time slots to be applied to the current time slots data is carried out data demodulates; Carry out data demodulates and the channel estimation results that uses the Preamble sign indicating number of next time slot is applied to the current time slots rear section, thereby can make system obtain more excellent performance.
As shown in Figure 5, improve the device concrete structure sketch map of systematic function in the MBSFN system that provides for the embodiment of the invention.This device comprises: Data Receiving unit 510, channel estimating unit 520, data partitioning unit 530, data demodulation unit 540; Can also comprise: merge processing unit 550; Wherein:
Said Data Receiving unit 510 is used to receive the Preamble sign indicating number of current time slots data and next time slot;
Said channel estimating unit 520 is used for using respectively the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating, obtains first channel estimation results and second channel estimated result;
Said data partitioning unit 530 is used for the said data that receive are divided into two of front and back;
Said data demodulation unit 540 is used to utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilizes said second channel estimated result that the back blocks of data is carried out demodulation;
Said merging processing unit 550 is used for two blocks of data of the front and back after the demodulation are merged.Specifically:
If said data partitioning unit 530 is divided into two of nonoverlapping front and back with data, then said merging processing unit 550 is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and two blocks of data of the front and back after the demodulation are merged.If said data partitioning unit 530 is divided into two of overlapping front and back with data, then said merging processing unit 550 is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and adopts linear averaging act of union or power ratio act of union to merge.
As shown in Figure 6, improve the device concrete structure sketch map of systematic function in the MBSFN system that provides for the embodiment of the invention.This device can also comprise except comprising the described functional unit of the foregoing description: judge indicating member 600; Wherein:
Said judgement indicating member 600 is used to judge whether next time slot has business datum to send, and when judging that next time slot has business datum to send, designation data receiving element 610 receives data.
Need to prove that said device can be the terminal, perhaps is a functional entity in the terminal.
The embodiment of the invention also further provides a kind of MBSFN system, comprises the said device of the foregoing description, specifies and sees the foregoing description for details, repeats no more here.
One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; This program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If said integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
In sum; This paper provides the method and apparatus that improves systematic function in a kind of MBSFN system; Carry out the situation of channel estimating based on the Preamble sign indicating number that only uses current time slots in the prior art, proposed under high-speed mobile environment, and current time slots is when all existing MBMS broadcasting with next time slot; Use the Preamble sign indicating number of current time slots to carry out channel estimating respectively with next time slot Preamble sign indicating number; With the data division separated into two parts, the data first half uses the channel estimation results of the Preamble sign indicating number of current time slots to carry out data demodulates then, and the data latter half uses the channel estimation results of next time slot Preamble sign indicating number to carry out demodulation.Because front and back two parts data have all used the channel estimation results of nearer Preamble sign indicating number to carry out demodulation, thereby can avoid current time slots Preamble sign indicating number to be applied to the problem that data latter half data are carried out the demodulation performance difference effectively.In a word; The channel estimation results of next time slot Preamble sign indicating number of the actual multi-path environment of the present invention through will be more embodying the rear section data; Be applied in the demodulating process of rear section data; Make its demodulation performance be improved, and then make the performance that merges the back data also be improved, thereby make the performance of system obtain bigger improvement and raising.
More than the method and apparatus that improves systematic function in the MBSFN provided by the present invention system has been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand scheme of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. improve the method for systematic function in the MBSFN system, the implication of said MBSFN is the multicast Single Frequency Network, it is characterized in that, comprising:
When a time slot has business datum to send instantly, receive the Preamble sign indicating number of current time slots data and next time slot;
Use the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating respectively, obtain first channel estimation results and second channel estimated result;
The said data that receive are divided into two of front and back, utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilize said second channel estimated result that the back blocks of data is carried out demodulation.
2. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that, also comprise: two blocks of data of the front and back after the demodulation are merged.
3. improve the method for systematic function in the MBSFN according to claim 2 system; It is characterized in that; If the said data that receive are divided into two of nonoverlapping front and back, then two blocks of data of the front and back after the demodulation are merged, comprise that the power with the back blocks of data is adjusted into the power of preceding blocks of data.
4. improve the method for systematic function in the MBSFN according to claim 2 system; It is characterized in that; If the said data that receive are divided into two of overlapping front and back; Then two overlapped data in the front and back after the demodulation are merged, comprise that the power with the back blocks of data is adjusted into the power of preceding blocks of data, adopts linear averaging act of union or power ratio act of union to merge.
5. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that, also comprise:
Judge whether next time slot has business datum to send.
6. improve the device of systematic function in the MBSFN system, it is characterized in that, comprising:
The Data Receiving unit is used to receive the Preamble sign indicating number of current time slots data and next time slot;
Channel estimating unit is used for using respectively the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot to carry out channel estimating, obtains first channel estimation results and second channel estimated result;
Data partitioning unit is used for the said data that receive are divided into two of front and back;
Data demodulation unit is used to utilize said first channel estimation results that preceding blocks of data is carried out demodulation, utilizes said second channel estimated result that the back blocks of data is carried out demodulation.
7. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that said device also comprises:
Merge processing unit, be used for two blocks of data of the front and back after the demodulation are merged.
8. improve the device of systematic function in the MBSFN according to claim 7 system; It is characterized in that; If said data partitioning unit is divided into two of nonoverlapping front and back with data; Then said merging processing unit is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and two blocks of data of the front and back after the demodulation are merged.
9. improve the device of systematic function in the MBSFN according to claim 7 system; It is characterized in that; If said data partitioning unit is divided into two of overlapping front and back with data; Then said merging processing unit is used for the power of back blocks of data is adjusted into the power of preceding blocks of data, and adopts linear averaging act of union or power ratio act of union to merge.
10. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that, also comprise:
Judge indicating member, be used to judge whether next time slot has business datum to send, and when judging that next time slot has business datum to send, the designation data receiving element receives data.
11. the device according to improving systematic function in any described MBSFN system of claim 6 to 10 is characterized in that said device is the terminal, perhaps is a functional entity in the terminal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383811A (en) * | 2007-09-06 | 2009-03-11 | 展讯通信（上海）有限公司 | Frame structure in communication system, frame receiving method and device thereof |
| CN101399789A (en) * | 2007-09-26 | 2009-04-01 | 大唐移动通信设备有限公司 | Method and apparatus for single frequency network channel estimation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383811A (en) * | 2007-09-06 | 2009-03-11 | 展讯通信（上海）有限公司 | Frame structure in communication system, frame receiving method and device thereof |
| CN101399789A (en) * | 2007-09-26 | 2009-04-01 | 大唐移动通信设备有限公司 | Method and apparatus for single frequency network channel estimation |
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