CN1697351A - Auxiliary pilot method in use for time division duplexing system - Google Patents
Auxiliary pilot method in use for time division duplexing system Download PDFInfo
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- CN1697351A CN1697351A CNA2005100707102A CN200510070710A CN1697351A CN 1697351 A CN1697351 A CN 1697351A CN A2005100707102 A CNA2005100707102 A CN A2005100707102A CN 200510070710 A CN200510070710 A CN 200510070710A CN 1697351 A CN1697351 A CN 1697351A
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Abstract
When moving in time division duplexing system at high speed, terminal transmits service data as well as transmits auxiliary pilot at same time. The said auxiliary pilot occupies resources in time division duplexing system. When service data are transmitted, the said auxiliary pilot is transferred at synchronistically in time. Auxiliary pilot can carry out channel estimation independently or auxiliary pilot combined with inherent intermittent pilot can carry out channel estimation.
Description
Technical field
The present invention relates to the structure of time slot of time division duplex (TDD) system, the arrangement mode of auxiliary pilot in the TDD structure of time slot when especially moving at terminal high-speed.
Background technology
In recent years, along with the continuous development of network and mobile communication technology, people are to the demand phenomenal growth of two-forty and high-quality wireless communication business.The demand of this phenomenal growth is encouraging people to study the mobile communication system of a new generation, and time division duplex (TDD) pattern enters people's eyes thus.In research to tdd mode, it is found that it transmits and receives signal and carries out in different time-gap, adopt the certain protection time to be separated each other, do not need to distribute the frequency of symmetrical frequency band.When carrying out asymmetric transfer of data, use this pattern can change the ratio of uplink and downlink time slot flexibly, make full use of the limited radio frequency spectrum resource.This pattern has certain competitiveness in 3G (Third Generation) Moblie and even super three generations's mobile communication project.On the other hand, use the system of this pattern to adopt intermittently pilot tone to carry out channel estimating more, cause the anti-rapid fading ability of system relatively poor relatively.With TDD canonical system shown in Figure 1---TD-SCDMA is an example, when thereby terminal high-speed motion channel variation is violent, pilot tone at intermittence in the TDD system time gap, the channel variation that can't accurately reflect data division, be used for whole time slot with the channel value that intermittence, pilot tone estimated, then bring the very big decline of systematic function undoubtedly, make TDD support that the ability of high-speed motion terminal is poor than FDD.
Summary of the invention
Be difficult to tackle the problem that terminal high-speed moves at the batch (-type) pilot tone that exists in the existing TDD system, the present invention proposes a kind of auxiliary pilot method that is used for tdd systems,
According to the present invention, a kind of auxiliary pilot method that is used for tdd systems is provided, comprise step:
When terminal when described tdd systems high speed moves, transmission auxiliary pilot in service data transmission, wherein said auxiliary pilot takies the resource of described tdd systems, and transmits described auxiliary pilot with described synchronizing traffic data ground in time.Auxiliary pilot can be independently or with original intermittence pilot tone combine and carry out channel estimating.
The method according to this invention by increasing auxiliary pilot, can write down the variation of channel, thereby obtain precise channels information, the systematic function when improving the terminal high-speed motion.
Description of drawings
With reference to the accompanying drawings and describe the building method of auxiliary pilot of the present invention in conjunction with example.
Fig. 1 shows the channel magnitude-time response curve when terminal high-speed moves in existing TD-SCDMA;
Fig. 2 shows according to auxiliary pilot schematic diagram of the present invention;
Fig. 3 shows according to low-density auxiliary pilot schematic diagram of the present invention;
Fig. 4 shows according to the auxiliary pilot of the TD-SCDMA of being used for of the present invention system and arranges schematic diagram;
Fig. 5 shows according to the TD-SCDMA channel characteristic estimation based on the auxiliary pilot pattern of the present invention, and wherein the speed of a motor vehicle is 120km/h;
Fig. 6 shows the systematic function of estimating based on Auxiliary Pilot Channel according to of the present invention, and wherein the speed of a motor vehicle is 120km/h.
Embodiment
In the present invention, for the system of terminal high-speed motion, parallel transmission auxiliary pilot in service data transmission.Auxiliary pilot can be mutually orthogonal with business datum, to eliminate the interference between the two.If auxiliary pilot to be sent is d
0, business datum is d
iMake X
0, X
1..., X
i... represent one group of so specific orthogonalization computing: establish X
0 -1, X
1 -1..., X
i -1... with X
0, X
1..., X
i... corresponding one by one, inverse operation each other, then X
i -1, X
jSatisfy when i=j,
When i ≠ j,
Make s
0=X
0(d
0), s
i=X
i(d
i), s then
0With s
iMutually orthogonal, the signal that transmits in the channel is s=s
0+ s
i
For different mobile communication system, orthogonalization computing X
iForm of expression difference, the different methods of salary distribution of corresponding system resource.For TD-SCDMA system, X
iShow as spread spectrum, system resource is mainly distributed with sign indicating number, and auxiliary pilot takies system's code channel resource.For the system that uses the OFDM technology, X
iShow as signal and carry out the orthogonalization carrier modulation, system resource is mainly used allocation of carriers, and auxiliary pilot takies the system subcarrier resource.Fig. 2 is the schematic diagram of auxiliary pilot, and transverse axis is represented the time, and the longitudinal axis is the system resource of auxiliary pilot and data occupancy.
According to the translational speed and the performance requirement of terminal reality, the density of auxiliary pilot can adopt different ratios.Auxiliary pilot shown in Figure 2 is the high density pilot tone that adopts under the high speed of a motor vehicle, the corresponding business datum symbol of frequency pilot sign.Fig. 3 is the medium speed of a motor vehicle or the performance requirement density auxiliary pilot on the low side when not high, with the corresponding a plurality of business datum symbols of a frequency pilot sign, intermittently locates to transmit low volume data in pilot tone.
Illustrate the application of auxiliary pilot in the TD-SCDMA system below.
The TD-SCDMA system time gap structure of employing auxiliary pilot pattern takies a specific code channel at this auxiliary pilot as shown in Figure 4, is referred to as the pilot tone code channel.For keeping the orthogonality between pilot tone code channel and the data code channel, 704 chip of auxiliary pilot, by the pilot frequency sequence process spread spectrum acquisition isometric with spread spectrum data sequence before, each 352chip corresponding data is arranged before and after being divided into, and all the other are complied with original structure of time slot placement pilot tone at intermittence or leave a blank.
Make d
k(n
s) corresponding k the user's of expression transmitting terminal n
sIndividual business datum symbol.c
kExpression d
k(n
s) spreading code, length is Q, i.e. c
k=[c
k(1), c
k(2) ..., c
k(Q)].d
p(n
s) represent corresponding frequency pilot sign, c
pExpression d
p(n
s) spreading code.s
k(t
s) represent that transmitting terminal is at t
sThe signal of instantaneous transmission constantly is then at t
sConstantly instantaneous, the signal s that transmitting terminal sends
k(t
s) can be expressed as:
s
k(t
s)＝d
k(n
s)c
k(t
s-(n
s-1)Q)+d
p(n
s)c
p(t
s-(n
s-1)Q) (1)
Wherein, n
sBe that transmitting terminal is at t
sThe pilot tone that constantly should send and the sequence number of business datum symbol, it and moment t
sThe pass be:
Symbol
Expression rounds to positive infinity.
Utilize the orthogonality between the spreading code, the different information of pilot tone code channel and business datum code channel of can isolating at receiving terminal are carried out channel estimating and Data Detection.
This method can be used for forward channel, also can be used for backward channel.
Use when terminal high-speed moves that auxiliary pilot carries out that channel estimating obtains channel magnitude-the time response curve as shown in Figure 5.Data division channel magnitude-time response of utilizing the auxiliary pilot estimation to obtain is represented with solid line; As a comparison, extract actual channel amplitude-time response of this time period and dot (the solid line dotted line overlaps substantially among the figure); Use the pilot tone at intermittence in the TDD system to carry out channel estimating to the same section characteristic of channel, the channel magnitude-time response that obtains is represented with chain-dotted line.As can be seen, use auxiliary pilot can obtain than using pilot tone intermittently more near the characteristic of channel of actual channel.The improvement of TDD systematic function as shown in Figure 6 when using auxiliary pilot that terminal high-speed is moved.Solid line carries out the system BER performance of channel estimating for using auxiliary pilot among the figure, and dotted line carries out error rate of system (BER) performance of channel estimating for use pilot tone at intermittence.As can be seen, use the improvement of auxiliary pilot to systematic function, obvious further along with the increase of system signal noise ratio.
The present invention is described in conjunction with instantiation.Yet, apparent for those skilled in the art, can be under the situation that does not depart from spirit of the present invention, thought of the present invention is applied in the different instantiations goes.The description here is just illustrative, and should not think restrictive fully.Scope of patent protection of the present invention is provided by claims, rather than the explanation of front.Therefore all various modification and equivalents that drop in the claim scope all should belong within the scope of patent protection of the present invention.
Claims (10)
1, a kind of auxiliary pilot method that is used for tdd systems comprises step:
When terminal when described tdd systems high speed moves, transmission auxiliary pilot in service data transmission, wherein said auxiliary pilot takies the resource of described tdd systems, and transmits described auxiliary pilot with described synchronizing traffic data ground in time.
2, auxiliary pilot method according to claim 1, wherein said auxiliary pilot and described business datum are mutually orthogonal.
3, auxiliary pilot method according to claim 1, wherein said auxiliary pilot combine with pilot tone intermittently and are used for channel estimating.
4, auxiliary pilot method according to claim 1, wherein said auxiliary pilot is used for channel estimating independently.
5, auxiliary pilot method according to claim 1, wherein said resource is a code channel.
6, auxiliary pilot method according to claim 1, wherein said resource is a subcarrier.
7, auxiliary pilot method according to claim 1, one of them auxiliary pilot symbol is corresponding to a business datum symbol.
8, auxiliary pilot method according to claim 1, one of them auxiliary pilot symbol is corresponding to a plurality of business datum symbols.
9, auxiliary pilot method according to claim 1, described method are used for forward channel and estimate.
10, auxiliary pilot method according to claim 1, wherein said method are used for backward channel and estimate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100707102A CN1697351B (en) | 2005-05-17 | 2005-05-17 | Auxiliary pilot method in use for time division duplexing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100707102A CN1697351B (en) | 2005-05-17 | 2005-05-17 | Auxiliary pilot method in use for time division duplexing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1697351A true CN1697351A (en) | 2005-11-16 |
| CN1697351B CN1697351B (en) | 2011-08-10 |
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ID=35349900
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100707102A Active CN1697351B (en) | 2005-05-17 | 2005-05-17 | Auxiliary pilot method in use for time division duplexing system |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101636932B (en) * | 2007-03-02 | 2013-12-04 | 高通股份有限公司 | Robust transmission scheme for wireless networks |
| CN110121209A (en) * | 2018-02-05 | 2019-08-13 | 北京佰才邦技术有限公司 | A kind of transmission method of pilot frequency information, the network equipment and terminal |
-
2005
- 2005-05-17 CN CN2005100707102A patent/CN1697351B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101636932B (en) * | 2007-03-02 | 2013-12-04 | 高通股份有限公司 | Robust transmission scheme for wireless networks |
| CN110121209A (en) * | 2018-02-05 | 2019-08-13 | 北京佰才邦技术有限公司 | A kind of transmission method of pilot frequency information, the network equipment and terminal |
| CN110121209B (en) * | 2018-02-05 | 2023-04-07 | 北京佰才邦技术股份有限公司 | Pilot frequency information transmission method, network equipment and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1697351B (en) | 2011-08-10 |
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Owner name: BEIJING UNIV. OF POST AND TELECOMMUNICATION; APPL Free format text: FORMER OWNER: BEIJING UNIV. OF POST AND TELECOMMUNICATION Effective date: 20060224 |
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Effective date of registration: 20060224 Address after: 100876 Beijing city Haidian District Xitucheng Road No. 10 Applicant after: Beijing University of Posts and Telecommunications Co-applicant after: Spreadtrum Communications (Shanghai) Co., Ltd. Address before: 100876 Beijing city Haidian District Xitucheng Road No. 10 Applicant before: Beijing University of Posts and Telecommunications |
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