CN102170343B - Uplink multi-user pilot frequency method for reducing interference among cells - Google Patents
Uplink multi-user pilot frequency method for reducing interference among cells Download PDFInfo
- Publication number
- CN102170343B CN102170343B CN201110103688.2A CN201110103688A CN102170343B CN 102170343 B CN102170343 B CN 102170343B CN 201110103688 A CN201110103688 A CN 201110103688A CN 102170343 B CN102170343 B CN 102170343B
- Authority
- CN
- China
- Prior art keywords
- user
- pilot
- pilot tone
- users
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an uplink multi-user pilot frequency method for reducing interference among cells. the method comprises the following steps of: with the minimum subcarrier resource block scheduled by wireless resource as a unit in a cell, distributing different amounts of minimum subcarrier resource blocks to users with different requirements in the cell so that pilot frequencies of users in the cell are orthogonal in a frequency domain; applying repeated CAZAC (Constant Amplitude Zero Auto Correlation) sequences to the pilot frequency of each minimum subcarrier resource block; enabling the pilot frequencies of users in neighboring cells to be orthogonal in a code domain according to CAZAC correlation characteristic among the neighboring cells. According to the invention, orthogonality of pilot frequencies of users can be ensured by utilizing frequency division in a cell and code division among cells, thus inhibiting interference among cells and reducing system complexity.
Description
Technical field
The invention provides a kind of uplink multi-user pilot method reducing presence of intercell interference, be applicable to Single Carrier-Frequency Division multi-address system or orthogonal frequency division multiple access system, especially current 3GPP long evolving system or forth generation mobile communication system.
Background technology
3G mobile communication system can support certain multimedia service.Meanwhile, WLAN (wireless local area network) (WLAN) technology has been broadly considered following focus covering system, comprises IEEE802.11a/b/g and HIPERLAN/2.However, before the generally application of 3G system, some universities, company and organize the correlative study extensively having carried out B3G (beyond 3G) aspect, and preliminary and positive discussion has all been carried out to the future development of B3G.In the face of the challenge of B3G, come from the competition that Wimax technology is introduced in addition.Since in November, 2004,3GPP starts Long Term Evolution (LTE) project, i.e. the standardized process of E3G (Enhanced 3G).Because different multi-access modes directly can affect the spectrum efficiency of the capacity of base station and system, transmission, the complexity of receiver and the cost of realization and system to the adaptive capacity of different business speed, so the requirement whether selection of multi-access mode meets 3GPP to LTE system is most important.Through 3GPP RAN1 in Beijing, Quebec, the repeatedly meeting such as Toronto and London discussion, descending substantially unification is OFDM (OFDMA) mode at present, and up basic unification is Single Carrier-Frequency Division multiple access (SC-FDMA).
For up SC-FDMA system, with the realization difference of OFDMA, it is that transmitting terminal has carried out again a discrete Fourier transform (DFT) (DFT), effectively can reduce the power PAR of system.But the realization in order to receiving terminal simplifies and improves performance, and SC-FDMA also will adopt channel estimation in frequency domain and balancing technique, and thus SC-FDMA and OFDMA has certain common point in the pilot design of transmitting terminal.In order to ensure the performance of uplink multi-users channel estimating, providing and can support multi-user, and ensure in community just most important with the orthogonal guide frequency of minizone.
Summary of the invention
The object of the present invention is to provide a kind of uplink multi-user pilot method reducing presence of intercell interference, thus bandwidth varying can be supported neatly and suppress the interference between neighbor cell.
According to the present invention, provide a kind of uplink multi-user pilot method reducing presence of intercell interference, wherein:
In community with the minimum sub-carrier resources block of wireless resource scheduling for unit, for the difference in described community requires that user distributes the minimum sub-carrier resources block of varying number, make the pilot tone of the user in community orthogonal on frequency domain;
Pilot tone wherein in each minimum sub-carrier resources block uses normal amplitude-zero autocorrelation sequence repeated, and
Between neighbor cell, make the pilot tone of the user between described neighbor cell orthogonal in code domain according to the their cross correlation of described normal amplitude-zero autocorrelation sequence.
The uplink multi-user pilot method of reduction presence of intercell interference of the present invention is applicable to Single Carrier-Frequency Division multi-address system (SC-FDMA) or orthogonal frequency division multiple access system (OFDMA).
According to basic conception of the present invention, in order to ensure the ascending pilot frequency orthogonality between an intra-cell users, the mode that pilot tone is unit with the minimum sub-carrier resources block of wireless resource scheduling provides, the pilot tone of user is for allocation units with the minimum sub-carrier resources block of wireless resource scheduling, make the pilot tone of intra-cell users orthogonal on frequency domain, just can be supported the multi-user in community like this by orthogonal frequency.Obviously, in the method by distributing the minimum sub-carrier resources block of varying number for user, just can provide the pilot channel of different bandwidth, thus meet future mobile communication system to the requirement supporting bandwidth varying.
Moreover in the method in order to reduce the Pilot Interference of minizone, the pilot tone in each minimum sub-carrier resources block uses normal amplitude-zero autocorrelation sequence (CAZAC) repeated to form, and neighbor cell adopts the CAZAC sequence of different offset phase.It is orthogonal in code domain that the good their cross correlation of CAZAC sequence can realize inter-cell user, suppresses to disturb between neighbor cell, and reduce the complexity of receiving terminal.
Accompanying drawing explanation
Also with reference to embodiment, the present invention is described below in conjunction with accompanying drawing, wherein:
The structural representation of frequency division pilot tone in Tu1Shi community, pilot tone and data acquisition time division multiplexing mode, namely take different OFDM symbol positions.In a subframe or time slot, the data of different user may distribute different block of sub-carriers, and pilot tone is also adopt frequency division, reaches the object supporting multi-user.
Fig. 2 is that the CAZAC sequence period of M=3 repeats, into example, to adopt the orthogonal guide frequency of different initial phase between obvious different districts with length, reaches the object reducing presence of intercell interference.
Fig. 3 shows the example of uplink subframe structure.
Fig. 4 gives translational speed when being 3km/h, 1 × 2 antenna, takies the error rate of different user number when 1/2 encoding rate (BER) of same group (chunk) with Es/No performance.
Embodiment
The ascending pilot frequency method that the present invention proposes may be used for AF panel between multiple cell and reduces the complexity of receiver, meets requirement when SC-FDMA and OFDMA system multi-upstream access.
In the present invention, for the uplink subframe structure of 3GPP 25.814V1.0.1 version, as shown in Figure 3.For reducing peak-to-average power ratio (PAPR, Peak to Average Power Ratio), data and pilot transmission have employed time division multiplexing (TDM, Time Division Duplex) mode, i.e. long block (LB, Long block) for transfer of data, short block (SB, Short block) is for the transmission of pilot frequency information.Cyclic Prefix (CP, Cyclic Prefix) is added for overcoming the intersymbol interference (ISI, Inter-Symbol Interference) of Multipath Transmission before each OFDM symbol.Pilot frequency information is used for channel estimating and frequency domain equalization.
Fig. 1 is the frame structure schematic diagram based on frequency division pilot tone in community, is wherein that it is made up of the subcarrier of some with the minimum sub-carrier resources block of wireless resource scheduling for minimum unit.By requiring that to difference user distributes the minimum sub-carrier resources block of varying number, the requirement of up different user bandwidth varying can be supported.In the present invention, minimum sub-carrier resources block can be group (chunk), also can be block (block).In a preferred embodiment, shared by the sub-carrier number in group (chunk), bandwidth equals the subcarrier bandwidth shared by pilot tone.
In the present invention, in same sector, the pilot tone of different user adopts frequency division, just can improve the number of users of an Intra-cell support like this, improve power system capacity only by channeling.Because different user pilot tone in community adopts orthogonal frequency, the user namely in same community uses same pilot information but takies different frequency range, greatly can be improved the number of users of system support by frequency of utilization multiplex technique.
In the present invention, normal amplitude-zero autocorrelation sequence (CAZAC) sequence that the pilot frequency information in a group (chunk) is M by length repeats to form.The length M of CAZAC sequence need in correlation bandwidth, even if make, under frequency-selective channel, still can keep the good orthogonality of inter-cell pilot.
And that adopt brachymemma in the present invention, that length equals group (chunk) pseudo random sequence is to reduce peak-to-average power ratio or cube amount (PAPR or CM) of pilot frequency sequence.
Fig. 2 is pilot orthogonal schematic diagram between multiple cell, and wherein group (chunk) size is 10 subcarriers is example.Basic pilot frequency sequence repeats to produce by the CAZAC sequence period that length is M=3, and the pilot tone initial phase between different districts is different.Utilize the good their cross correlation of CAZAC sequence to realize pilot frequency sequence orthogonal in code domain, reduce the interference between neighbor cell.
In conjunction with examples prove validity of the present invention, in emulation adopt parameter to be the uplink transmission parameter of 5MHz system bandwidth in 3GPP25.814V1.0.1 version table 9.1.1-1, frame structure is Fig. 9 .1.1-3. uplink subframe structure in 3GPP 25.814V1.0.1 version, and channel is the Pedestrian B channel in M.1225 advising.Fig. 4 gives translational speed when being 3km/h, 1 × 2 antenna, takies the error rate of different user number when 1/2 encoding rate (BER) of same group (chunk) with Es/No performance.Can find out, even if when multiple cell interference is the strongest, when the user namely having 3 to be distributed in edge, neighbor cell shares same group (chunk), when BER is 10-3, compared with situation during single user, its performance loss is less than 2dB.
Can be found out by above analysis, ascending pilot frequency method of the present invention by using frequency division in community, minizone code divides the orthogonality ensureing user's pilot tone, thus suppress presence of intercell interference, reduce the complexity of system.
Claims (5)
1. for a uplink multi-user pilot method for the reduction presence of intercell interference of Single Carrier-Frequency Division multi-address system SC-FDMA, it is characterized in that, described method comprises:
In community with the minimum sub-carrier resources block of wireless resource scheduling for unit, user in described community receives the minimum sub-carrier resources block distributing and obtain, the quantity of the minimum sub-carrier resources block that the user in described community and other users of different requirement in described community receive is different, and the pilot tone of the user in described community is orthogonal on frequency domain with the pilot tone of other users in described community;
Wherein, pilot tone in each minimum sub-carrier resources block uses normal amplitude-zero autocorrelation sequence repeated, and makes the pilot tone of the user in described community orthogonal in code domain with the pilot tone of the user of neighbor cell according to the their cross correlation of normal amplitude-zero autocorrelation sequence described between neighbor cell.
2. method according to claim 1, is characterized in that, described method is used for orthogonal frequency division multiple access system.
3., according to the arbitrary described method of claim 1-2, it is characterized in that, described method also comprises step:
That utilize brachymemma, that length equals wireless resource scheduling sub-carrier resources block pseudo random sequence is to reduce power PAR or cube amount of pilot frequency sequence.
4., according to the arbitrary described method of claim 1-2, it is characterized in that, bandwidth shared by the subcarrier in described minimum sub-carrier resources block equals bandwidth shared by the subcarrier shared by pilot tone.
5. method according to claim 1, is characterized in that, the length of described normal amplitude-zero autocorrelation sequence is less than its correlation bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110103688.2A CN102170343B (en) | 2006-02-06 | 2006-02-06 | Uplink multi-user pilot frequency method for reducing interference among cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110103688.2A CN102170343B (en) | 2006-02-06 | 2006-02-06 | Uplink multi-user pilot frequency method for reducing interference among cells |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610002840 Division CN1808961B (en) | 2006-02-06 | 2006-02-06 | Uplink multi-user pilot method for interference depression between cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102170343A CN102170343A (en) | 2011-08-31 |
| CN102170343B true CN102170343B (en) | 2015-06-17 |
Family
ID=44491333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110103688.2A Active CN102170343B (en) | 2006-02-06 | 2006-02-06 | Uplink multi-user pilot frequency method for reducing interference among cells |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102170343B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9444595B2 (en) * | 2014-04-01 | 2016-09-13 | Qualcomm Incorporated | Hybrid waveform design combining OFDM and cyclic prefix based single carrier for millimeter-wave wireless communication |
| CN107248905A (en) * | 2016-03-24 | 2017-10-13 | 北京信威通信技术股份有限公司 | A kind of up DMRS transmission methods of multiuser MIMO |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1527513A (en) * | 2003-03-07 | 2004-09-08 | 北京三星通信技术研究有限公司 | Information processing method and device using time domain pilot sequence in OFDM system |
| CN1547414A (en) * | 2003-12-05 | 2004-11-17 | 大唐移动通信设备有限公司 | Method and apparatus for upstream and downstream resource allocation in time division duplexing mobile communication system |
| CN1708999A (en) * | 2002-10-29 | 2005-12-14 | 高通股份有限公司 | Uplink pilot and signaling transmission in wireless communication systems |
-
2006
- 2006-02-06 CN CN201110103688.2A patent/CN102170343B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1708999A (en) * | 2002-10-29 | 2005-12-14 | 高通股份有限公司 | Uplink pilot and signaling transmission in wireless communication systems |
| CN1527513A (en) * | 2003-03-07 | 2004-09-08 | 北京三星通信技术研究有限公司 | Information processing method and device using time domain pilot sequence in OFDM system |
| CN1547414A (en) * | 2003-12-05 | 2004-11-17 | 大唐移动通信设备有限公司 | Method and apparatus for upstream and downstream resource allocation in time division duplexing mobile communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102170343A (en) | 2011-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1808961B (en) | Uplink multi-user pilot method for interference depression between cells | |
| RU2447600C2 (en) | Method and device for control channel resources allocation in mobile communication system using orthogonal frequency division multiplexing | |
| EP1956771B1 (en) | Wireless communication system and wireless communication method | |
| CN108370586B (en) | Pilot signal transmission system and method | |
| RU2315433C1 (en) | Device and method for receiving/transmitting pilot-signal through communication uplink in communication system using orthogonal frequency division multi-access circuit | |
| US8953533B2 (en) | Wireless communication system, base station, server, wireless communication method, and program | |
| US8218420B2 (en) | Non-cyclic evolving-type user resource structure for OFDMA based system with null guard tones | |
| CN101507159B (en) | Dispensing device and communication means | |
| EP2232757A1 (en) | Ofdma frame structures for uplinks in mimo networks | |
| JP2014112867A (en) | Efficient multiplexing of reference signal and data in wireless communication system | |
| US9509473B2 (en) | Method and device for sending and receiving a reference signal | |
| CN104158617A (en) | Efficient and consistent wireless downlink channel configuration | |
| CN104012015A (en) | Control Channel Transmission Method and Apparatus For Transmitting Dedicated Reference Signal In Wireless Communication System | |
| KR20100071095A (en) | Data transmission method in a multi-carrier system, and transmitter | |
| CN103283199A (en) | Method and arrangement in wireless communications system | |
| KR20120138423A (en) | Method and apparatus for allocating resource of common control channel with dedicated reference signal | |
| WO2009082127A2 (en) | Method of multiplexing multiple access region | |
| CN1889754B (en) | Method and system for using reference symbol of multi-cell system | |
| US20120008615A1 (en) | Wireless communication system, base station, terminal, wireless communication method, and program | |
| CN102170343B (en) | Uplink multi-user pilot frequency method for reducing interference among cells | |
| EP1695502A1 (en) | Method and apparatus in a cellular telecommunications system | |
| US8498232B2 (en) | Method of transmitting data in wireless communication system | |
| CN101188454A (en) | Enhancing method for system pilot code and initial access processing method of 802.16m system terminal | |
| Lee et al. | A novel preamble design for time synchronization in OFDM-based multiple numerologies | |
| CN107294896A (en) | Subframe processing method and processing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |