WO2018035769A1 - 一种导频分配的方法及装置 - Google Patents

一种导频分配的方法及装置 Download PDF

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WO2018035769A1
WO2018035769A1 PCT/CN2016/096599 CN2016096599W WO2018035769A1 WO 2018035769 A1 WO2018035769 A1 WO 2018035769A1 CN 2016096599 W CN2016096599 W CN 2016096599W WO 2018035769 A1 WO2018035769 A1 WO 2018035769A1
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cell
users
user
edge
pilot
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PCT/CN2016/096599
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English (en)
French (fr)
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吴玉成
曹猛
朱鹏程
吴钒
刘统
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深圳天珑无线科技有限公司
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Priority to PCT/CN2016/096599 priority Critical patent/WO2018035769A1/zh
Publication of WO2018035769A1 publication Critical patent/WO2018035769A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

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  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for pilot allocation.
  • Multiple-input multiple-output technology can provide services for multiple users by using the same time-frequency resources. Since there are many users of massive MIMO systems and the number of orthogonal pilots is limited, it is not possible to assign orthogonal pilots to each user. A common solution is to allocate all orthogonal pilots in the same cell, and multiplex these pilots between different cells. Such pilot allocation may cause pilots between users in different cells to be non-orthogonal or identical. Inter-cell pilot pollution is generated.
  • the pilot allocation scheme uses orthogonal pilots for users who use the same pilot and have relatively large mutual interference between users with less interference between cells, so that pilot pollution exists.
  • the overall performance of the system can be improved, but the algorithm is complex, requires large-scale cooperation between base stations, and requires a large amount of system resources.
  • the embodiments of the present invention provide a pilot allocation method, which can suppress pilot pollution of edge users under the condition of using lower system resources.
  • an embodiment of the present invention provides a pilot allocation method, including:
  • each cell In each cell, acquiring a distance between the cell base station and each user in the cell;
  • determining, according to a distance between a cell base station in different cells and each user in the cell, and a corresponding edge user rated number, determining different cells Before the corresponding center user and edge user it also includes:
  • a user whose distance from the cell base station exceeds the distance threshold is divided into edge users;
  • an embodiment of the present invention provides a pilot allocation apparatus, including:
  • An acquiring unit configured to acquire, in each cell, a distance between the cell base station and each user in the cell;
  • a determining unit configured to determine a center user and an edge user corresponding to different cells according to a distance between a cell base station in different cells and each user in the cell and a corresponding distance threshold;
  • An allocating unit for allocating orthogonal pilot sequences to all edge users, and allocating a multiplexed pilot sequence to all central users; wherein the same pilot cell includes orthogonal pilot sequences assigned to edge users and assigned to the center All pilot sequences, including the user's multiplexed pilot sequence, are orthogonal to each other.
  • determining unit includes:
  • a dividing module configured to divide, in each cell, a user whose distance from the cell base station exceeds the distance threshold into an edge user
  • a determining module is configured to determine other users other than the edge user as the central user.
  • Embodiments of the present invention provide a method and a device for pilot allocation, which divide a cell user into a central user group and an edge user group according to path loss, a central user group of all cells multiplexes pilots, and an edge user group allocates orthogonal pilots.
  • a method and a device for pilot allocation which divide a cell user into a central user group and an edge user group according to path loss, a central user group of all cells multiplexes pilots, and an edge user group allocates orthogonal pilots.
  • only the intra-cell user group is used for pilot allocation, and large-scale cooperative communication between the base stations is not required for pilot suppression. Compared with the prior art, less system resources are used.
  • FIG. 1 is a schematic flow chart of a pilot allocation method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of another pilot allocation method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an edge user and a center user according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the composition of a pilot allocation apparatus according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing the composition of another pilot allocation apparatus according to an embodiment of the present invention.
  • first, second, third, etc. may be used to describe XXX in embodiments of the invention, these XXX should not be limited to these terms. These terms are only used to distinguish XXX from each other.
  • first XXX may also be referred to as a second XXX without departing from the scope of the embodiments of the present invention.
  • second XXX may also be referred to as a first XXX.
  • the word “if” as used herein may be interpreted as “when” or “when” or “in response to determining” or “in response to detecting.”
  • the phrase “if determined” or “if detected (conditions or events stated)” may be interpreted as “when determined” or “in response to determination” or “when detected (stated condition or event) “Time” or “in response to a test (condition or event stated)”.
  • FIG. 1 it is a schematic flowchart of a method according to an embodiment of the present invention. As shown in FIG. 1 , the method includes the following steps:
  • each cell obtain a distance between the cell base station and each user in the cell.
  • the cell base station can use the base station location technology to acquire the distance between the base station and the cell user.
  • the distance threshold can be analyzed by analyzing the path loss of some cell users farthest from the cell base station. The situation is determined. For example, a threshold of path loss is set, the distance between all cell users exceeding the path loss threshold and the base station is obtained, and the distance between the nearest user and the base station is set as a distance threshold.
  • the pilot sequences in the same cell including the orthogonal pilot sequence allocated to the edge user and the multiplexed pilot sequence allocated to the central user are orthogonal sequences.
  • the sum of the nominal number of users in all cells does not exceed the number of orthogonal pilot sequences.
  • the purpose of this allocation method is to allow different edge pilots in different cells to use different orthogonal pilot sequences. In this case, the sum of the number of orthogonal pilots to be allocated by each cell (i.e., the number of orthogonal pilots used by the edge users) cannot exceed the number of orthogonal pilot sequences.
  • the pilot sequence used by the central user can reuse the pilot sequence that is not used by the edge users in the cell in which it is located.
  • the values of the distance thresholds in different cells are generally different, and the number of central users and edge users of each cell may be different.
  • a pilot allocation method provided by an embodiment of the present invention can eliminate pilot pollution of edge users.
  • the proof process is as follows:
  • a channel propagation matrix representing a central user of cell j to a target cell i base station A channel propagation matrix representing an edge user of cell j to a target cell i base station.
  • p p is the uplink transmit power
  • ⁇ c (r: K c ) is the center of all users in cell pilot sequence matrix
  • ⁇ ej is all cell-edge users pilot sequence matrix
  • Additive white Gaussian noise for the uplink is the uplink transmit power
  • the channel matrix of the edge user is related to the cell base station where it is located, and is independent of other cell base stations. Since the pilot sequences of all cell users are orthogonal in one cell, there is no pilot pollution in the edge users.
  • the embodiment of the present invention provides a method for pilot allocation, which divides cell users into a central user group and an edge user group according to path loss, a central user group of all cells multiplexes pilots, and an edge user group allocates orthogonal pilots.
  • the embodiment of the invention only relies on intra-cell user packets for pilot allocation, and does not require large-scale cooperative communication between base stations for pilot suppression, and uses less system resources than the prior art.
  • a method for determining a center user and an edge user corresponding to different cells is provided.
  • a corresponding method flow is provided, and the method flow is as shown in FIG. 2 .
  • a user whose distance from the cell base station exceeds the distance threshold is divided into edge users.
  • the users in one cell are divided into a central user 31 and an edge user 32, and a corresponding grouping diagram is provided, as shown in FIG.
  • the embodiment of the present invention provides a pilot allocation device, which can be used to implement the foregoing method flows.
  • the composition thereof is as shown in FIG. 4, and includes:
  • the obtaining unit 41 is configured to acquire, in each cell, a distance between the cell base station and each user in the cell.
  • the determining unit 42 is configured to determine a center user and an edge user corresponding to different cells according to the distance between the cell base station in different cells and each user in the cell and the corresponding distance threshold.
  • the allocating unit 43 is configured to allocate orthogonal pilot sequences for all edge users, and allocate a multiplexed pilot sequence to all central users.
  • the pilot sequences in the same cell including the orthogonal pilot sequence allocated to the edge user and the multiplexed pilot sequence allocated to the central user are orthogonal sequences.
  • the sum of the nominal number of users in all cells does not exceed the number of orthogonal pilot sequences.
  • the purpose of this allocation method is to allow different edge pilots in different cells to use different orthogonal pilot sequences. In this case, the sum of the number of orthogonal pilots to be allocated by each cell (i.e., the number of orthogonal pilots used by the edge users) cannot exceed the number of orthogonal pilot sequences.
  • the pilot sequence used by the central user can reuse the pilot sequence that is not used by the edge users in the cell in which it is located.
  • the determining unit 42 includes:
  • the dividing module 421 is configured to divide, in each cell, a user whose distance from the cell base station exceeds the distance threshold into an edge user.
  • the determining module 422 is configured to determine other users except the edge user as the central user.
  • An embodiment of the present invention provides a device for pilot allocation, which divides a cell user into a central user group and an edge user group according to path loss, a central user group of all cells multiplexes pilots, and an edge user group allocates orthogonal pilots,
  • the embodiment of the invention only relies on intra-cell user packets for pilot allocation, and does not require large-scale cooperative communication between base stations for pilot suppression, and uses less system resources than the prior art.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in various embodiments of the present invention may be integrated into one processing order In the meta element, each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the above software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present invention. Part of the steps.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本发明实施例提供了一种导频分配方法，涉及通信领域，能够有效抑制边缘用户的导频污染。该方法包括：在每个小区中，获取小区基站与小区内各用户之间的距离；根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户；为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列；其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。本发明实施例适用于导频污染抑制的过程中。

Description

一种导频分配的方法及装置 技术领域
本发明涉及通信领域，尤其涉及一种导频分配的方法及装置。
背景技术
大规模MIMO(multiple-input multiple-output，多输入多输出)技术可以利用相同的时频资源为多用户提供服务。由于大规模MIMO系统用户又非常多而正交导频数量有限，因此不能给为每个用户分配正交导频。目前常见的解决方案是同一小区内分配所有正交导频，不同小区之间复用这些导频，这样的导频分配会使不同小区内用户之间的导频非正交或完全相同，从而产生小区间导频污染现象。
目前针对大规模MIMO导频污染抑制技术中，导频分配方案为小区间相互干扰较小的用户采用相同的导频而相互干扰较大的用户采用正交的导频，从而在存在导频污染的情况下，可以提升系统的整体性能，但算法复杂，需要基站之间大规模协作，需要占用大量的系统资源。
发明内容
有鉴于此，本发明实施例提供了一种导频分配方法，能够在使用较低的系统资源的条件下抑制边缘用户的导频污染。
一方面，本发明实施例提供了一种导频分配方法，包括：
在每个小区中，获取小区基站与小区内各用户之间的距离；
根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户；
为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列；其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，在所述根据不同小区内小区基站与小区内各用户之间的距离以及相应的边缘用户额定数目，确定不同小区各自对应的中心用户和边缘用户之前，还包括：
在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户；
将除所述边缘用户外的其它用户确定为中心用户。
另一方面，本发明实施例提供了一种导频分配装置，包括：
获取单元，用于在每个小区中，获取小区基站与小区内各用户之间的距离；
确定单元，用于根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户；
分配单元，用于为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列；其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述确定单元包括：
划分模块，用于在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户；
确定模块，用于将除所述边缘用户外的其它用户确定为中心用户。
本发明实施例提供了一种导频分配的方法及装置，根据路径损耗将小区用户分成中心用户组和边缘用户组，所有小区的中心用户组复用导频，边缘用户组分配正交导频，本发明实施例仅依靠小区内用户分组来进行导频分配，并不需要基站间大规模协作通信来进行导频抑制，相比于现有技术来讲，使用的系统资源更少。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1是本发明实施例所提供的一种导频分配方法的流程示意图；
图2是本发明实施例所提供的另一种导频分配方法的流程示意图；
图3是本发明实施例所提供的一种边缘用户与中心用户的示意图；
图4是本发明实施例所提供的一种导频分配装置的组成框图；
图5是本发明实施例所提供的另一种导频分配装置的组成框图。
具体实施方式
为了更好的理解本发明的技术方案，下面结合附图对本发明实施例进行详细描述。
应当明确，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
在本发明实施例中使用的术语是仅仅出于描述特定实施例的目的， 而非旨在限制本发明。在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。
应当理解，本文中使用的术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应当理解，尽管在本发明实施例中可能采用术语第一、第二、第三等来描述XXX，但这些XXX不应限于这些术语。这些术语仅用来将XXX彼此区分开。例如，在不脱离本发明实施例范围的情况下，第一XXX也可以被称为第二XXX，类似地，第二XXX也可以被称为第一XXX。
取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”或“响应于检测”。类似地，取决于语境，短语“如果确定”或“如果检测(陈述的条件或事件)”可以被解释成为“当确定时”或“响应于确定”或“当检测(陈述的条件或事件)时”或“响应于检测(陈述的条件或事件)”。
本发明实施例给出一种导频分配方法，请参考图1，其为本发明实施例所提供的方法的流程示意图，如图1所示，该方法包括以下步骤：
101、在每个小区中，获取小区基站与小区内各用户之间的距离。
小区基站可以利用基站定位技术获取基站与小区用户的距离。
102、根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户。
距离阈值可以通过分析离小区基站最远的某几个小区用户的路径损 耗情况来确定。例如，设定一个路径损耗的阈值，获取超过路径损耗阈值的所有小区用户与基站的距离，将最近的用户与基站的距离设定为距离阈值。
103、为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列。
其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。所有小区内边缘用户额定数目的总和不超过所述正交导频序列数量，此种分配方法的目的在于让不同小区内的各个边缘用户均可使用不同的正交导频序列。在此种情况下，各小区所要分配的正交导频数量的总和(即边缘用户所使用的正交导频数量)不能够超过所述正交导频序列数量。而中心用户所使用的导频序列则可以复用其所在小区中边缘用户未使用的导频序列。
由于小区内用户的分布不尽相同，所以距离阈值在不同小区的值一般是不同的，那么每个小区的中心用户与边缘用户的数目也就可能不同。
本发明实施例所提供的一种导频分配方法，可以消除边缘用户的导频污染。证明过程如下：
将信道传播矩阵Hij划分为两部分，
Figure PCTCN2016096599-appb-000001
其中，
Figure PCTCN2016096599-appb-000002
表示小区j的中心用户到目标小区i基站的信道传播矩阵，
Figure PCTCN2016096599-appb-000003
表示小区j的边缘用户到目标小区i基站的信道传播矩阵。
获取目标小区i基站收到导频向量
Figure PCTCN2016096599-appb-000004
所述导频向量数学表达式为：
Figure PCTCN2016096599-appb-000005
其中，pp为上行链路发射功率，ψc(r：Kc)是小区中所有中心用户的导频序列矩阵，ψej是小区中所有边缘用户的导频序列矩阵，
Figure PCTCN2016096599-appb-000006
为上行链路的加性高斯白噪声。
根据最小二乘法计算边缘用户的信道矩阵
Figure PCTCN2016096599-appb-000007
所述信道矩阵的数学表达式为：
Figure PCTCN2016096599-appb-000008
其中，
Figure PCTCN2016096599-appb-000009
表示矩阵ψei的共轭转置。
从上述表达式中，可以得出边缘用户的信道矩阵与所在的小区基站有关，与其他小区基站无关。由于在一个小区内，所有的小区用户的导频序列正交，因此，边缘用户不存在导频污染。
本发明实施例提供了一种导频分配的方法，根据路径损耗将小区用户分成中心用户组和边缘用户组，所有小区的中心用户组复用导频，边缘用户组分配正交导频，本发明实施例仅依靠小区内用户分组来进行导频分配，并不需要基站间大规模协作通信来进行导频抑制，相比于现有技术来讲，使用的系统资源更少。
进一步，在本发明实施例的另一种实施方式中，提供了确定不同小区各自对应的中心用户和边缘用户的方法，基于此目的，提供了相应的方法流程，该方法流程如图2所示，具体如下：
201、在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户。
以基站为中心，以所述距离阈值为半径，确定的一个范围。在一个小区内部，所述范围之外的用户为边缘用户。
202、将除所述边缘用户外的其它用户确定为中心用户。
将一个小区内的用户划分成中心用户31与边缘用户32，提供了相应的分组示意图，如图3所示。
本发明实施例给出一种导频分配装置，可用于实现前述各方法流程，其组成如图4所示，包括：
获取单元41，用于在每个小区中，获取小区基站与小区内各用户之间的距离。
确定单元42，用于根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户。
分配单元43，用于为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列。
其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。所有小区内边缘用户额定数目的总和不超过所述正交导频序列数量，此种分配方法的目的在于让不同小区内的各个边缘用户均可使用不同的正交导频序列。在此种情况下，各小区所要分配的正交导频数量的总和(即边缘用户所使用的正交导频数量)不能够超过所述正交导频序列数量。而中心用户所使用的导频序列则可以复用其所在小区中边缘用户未使用的导频序列。
可选的是，如图5所示，所述确定单元42包括：
划分模块421，用于在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户。
确定模块422，用于将除所述边缘用户外的其它用户确定为中心用户。
本发明实施例提供了一种导频分配的装置，根据路径损耗将小区用户分成中心用户组和边缘用户组，所有小区的中心用户组复用导频，边缘用户组分配正交导频，本发明实施例仅依靠小区内用户分组来进行导频分配，并不需要基站间大规模协作通信来进行导频抑制，相比于现有技术来讲，使用的系统资源更少。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本发明所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如，多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单 元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元，可以存储在一个计算机可读取存储介质中。上述软件功能单元存储在一个存储介质中，包括若干指令用以使得一台计算机装置(可以是个人计算机，服务器，或者网络装置等)或处理器(Processor)执行本发明各个实施例所述方法的部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明保护的范围之内。

Claims (4)

  1. 一种导频分配的方法，其特征在于，所述方法包括：
    在每个小区中，获取小区基站与小区内各用户之间的距离；
    根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户；
    为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列；其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。
  2. 根据权利要求1所述的方法，其特征在于，所述根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户包括：
    在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户；
    将除所述边缘用户外的其它用户确定为中心用户。
  3. 一种导频分配的装置，其特征在于，所述装置包括：
    获取单元，用于在每个小区中，获取小区基站与小区内各用户之间的距离；
    确定单元，用于根据不同小区内小区基站与小区内各用户之间的距离以及相应的距离阈值，确定不同小区各自对应的中心用户和边缘用户；
    分配单元，用于为所有边缘用户分配正交导频序列，并且，为所有中心用户分配复用导频序列；其中，同一小区内的包括分配给边缘用户的正交导频序列和分配给中心用户的复用导频序列在内的所有导频序列互为正交序列。
  4. 根据权利要求3所述的装置，其特征在于，所述确定单元包括：
    划分模块，用于在每个小区中，将与小区基站的距离超过所述距离阈值的用户划分为边缘用户；
    确定模块，用于将除所述边缘用户外的其它用户确定为中心用户。
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