CN1336749A - 对于ofdm系统的频率复用方案 - Google Patents
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- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/12—Fixed resource partitioning
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
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- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
Abstract
本发明涉及一种基于OFDM方案的无线电信的蜂窝通信系统,包括多个基站B,将至少一个基站B分配给该通信系统的每个小区,从所述基站发送的信息包括数据部分和导频部分。本发明还涉及一种用于操作这种蜂窝通信系统的方法。本发明的特征在于,该数据部分的频率复用因数与该导频部分的频率复用因数不同,因此可达到根据该导频部分在高容量与可靠、正确的信道估算之间的最佳化。
Description
领域
本发明涉及基于正交频分复用(OFDM)方案的无线电信的蜂窝通信系统,和操作这种蜂窝通信系统的方法。
技术背景
无线电信的蜂窝系统根据蜂窝方案在基站与移动终端之间传送信息,根据该方案将该通信系统的整个通信区域分成一些小区。在多数的蜂窝通信系统中,每个小区具有分配的基站,该基站分别与该小区中的活动移动终端进行通信。然而,在一些蜂窝通信系统中,将多于一个的基站分配给每个小区。多数的现代和将来的蜂窝无线通信系统的目的在于具有很高数据速率的无线通信。提供高数据速率的一种通常无线通信方案是正交频分复用(OFDM)系统,其中将整个频带细分为频率副载波,使各个相邻频率副载波彼此正交。所以,可实现具有很高数据速率的无线通信,并可实现动态的频率分配。
在图3中,示出了一种通常的无线蜂窝OFDM通信系统,包括多个小区Z1,Z2,Z3,…和多个基站B,将每个基站B分配给小区Z1,Z2,Z3,…中的一个,在每个小区中的每个基站B与在该小区中的各个活动移动终端进行通信。在图中所示的无线蜂窝OFDM系统中,其频率复用因数是3,FRF=3。这里该频率复用因数与频率复用间距有关。(如果该频率复用因数增加,该频率复用间距也增加,反之亦然。)它的定义如下:
将该OFDM系统的整个频带分为三个副频带f1,f2,f3。例如副频带f1,f2,f3的每一个使用在该OFDM系统中可用的该整个频带的1/3。将每个小区Z1,Z2,Z3,…分为三个扇区,在每一小区中的三个扇区的每一个使用该副频带f1,f2,f3之一。换句话说,在一个小区Z1,Z2,Z3,…中使用每个副频带f1,f2,f3,从而每个副频带用在该小区的三个扇区中的一个里(FRF=3)。因此,在一个小区中的基站位于该小区的中心,并操作所有三个副频带f1,f2和f3。另一种是,基站可由三个不同的部分组成,每个部分操作在各个扇区中的各个副频带。在两种情况下,将定向天线用在该基站上,故如果该基站位于该小区的中心,通过定向天线操作每个扇区,例如,在小区Z1中的基站B只在三个方向之一在各个副频带中发送信息。对各个扇区的副频带的分配顺序是使相邻的扇区从不具有同样的分配副频带。在图3中所示的无线蜂窝OFDM系统具有,例如六边形的小区。将每个六边形小区Z1,Z2,Z3,…分为三个扇区,每个扇区具有分配给它的不同的一个副频带f1,f2,f3。考虑位于小区Z1的频带f1扇区的移动终端M。例如,将该副频带f1扇区示于图3中,在每个小区中的最低的扇区。因此,将移动终端M分配给小区Z1的基站B并以副频带f1与其通信,但由于该天线的方向性,它还可接收到来自邻近小区Z5,Z6和Z7的基站B的干扰信号。来自邻近小区的基站B的在相同频带f1中的这些干扰信号对通信的性能和质量具有不良的影响。特别是对于信道估算,来自邻近小区的干扰非常不利。在无线蜂窝OFDM系统中,通常根据导频模式进行信道估算。将这些导频模式从基站发送给各个活动的移动终端,后者根据接收的导频模式进行信道估算。在存在邻近小区干扰的情况下,该接收的导频模式被干扰,故不能进行精确和正确的信道估算。
图3中所示的无线蜂窝OFDM系统描述在例如US 5 867 478中。这个文件建议一种新的方案,对于相干无线蜂窝OFDM系统实行了的频率复用因数。在所建议的系统中,通过利用正交Walsh函数来减轻同频道干扰(例如来自邻近小区的)的影响从而可达到可靠的信道估算。因此,在基站与移动终端之间传输的信息包括数据部分和导频部分,将由移动终端接收的该导频部分用于信道估算。根据图3中所示的三个扇区频率复用模式发送该整个信息,即数据部分和导频部分。通过使用对于该导频模式的Walsh编码并通过增加该周期性扩展保护间隔,以保持该导频模式对于来自该三个邻近小区的导频模式的正交性(例如图3中所示的小区Z1对于三个邻近小区Z5,Z6和Z7),从而避免了来自邻近小区的干扰对于该导频模式的影响。该导频模式的长度可以是可变的,使得为导频部分所分配的频带对于为数据部分和导频部分所分配的整个频带之比也是可变的。然而,对于导频部分和数据部分的该频率复用因数是相同的。在每一扇区中以同样的副频带f1,f2或f3传输该数据部分和该导频部分。另外,只可将US 5 876 478中建议的该无线蜂窝OFDM系统用在同步蜂窝系统中,其中将每个OFDM发射机同步到一个标准上,而该标准是从一个公共源得到的。
概述
本发明的目的是提供,根据权利要求1的前序部分的,基于正交频分复用(OFDM)方案的无线电信的蜂窝通信系统;和根据 5的前序部分的,用于操作这种蜂窝通信系统的方法,从而允许对相干数据解调的更精确和更正确的信道估算。
通过基于OFDM方案的无线电信的蜂窝系统达到了上述目的,该系统包括多个基站,将至少一个基站分配给该通信系统的每个小区,从所述基站发送和接收的信息包括数据部分和导频部分,其特征在于,该数据部分的频率复用因数不同于该导频部分的频率复用因数。
因此本发明使得能够彼此独立地自由选择和采用该数据部分和该导频部分的这些复用因数,使得可选择传输结构以使来自邻近小区的干扰最小,从而可执行正确和精确的信道估算。
而且,可将根据本发明的蜂窝通信系统和操作这种通信系统的方法用在任何无线蜂窝OFDM系统,即没有任何限制地用在同步以及异步通信系统。异步系统是一种不使用任何公共源的系统,与同步系统相比可以比较廉价地建立整个蜂窝系统并具有更广的应用领域。
其优点是,该数据部分的频率复用因数小于该导频部分的频率复用因数。高的频率复用因数意味着该无线通信系统的低的数据传输容量,但在邻近小区之间有很低的干扰。低的频率复用因数意味着较高的数据传输容量,但在邻近小区之间也有较高的干扰。因此,以低的数据传输容量发送该导频部分,而同时具有来自邻近小区的很低干扰。因此,根据这些导频模式可进行很精确和正确的信道估算。另一方面,以较高的数据容量发送该数据模式,而比该导频部分具有更多的干扰。
另一个优点是,该数据部分的频率复用因数是3,而该导频部分的频率复用因数是9。
附图简述
在下面的描述中,将结合附图更详细地说明本发明,其中,
图1以数据部分的频率复用模式为例表示根据本发明的蜂窝通信系统;
图2以导频部分的频率复用模式为例表示图1的蜂窝通信系统;和
图3表示具有数据部分和导频部分的同样频率复用模式的一个已知的蜂窝通信系统。
详细描述
图1表示根据本发明的基于OFDM方案的无线电信的蜂窝通信系统。该通信系统包括多个基站B,将至少一个基站B分配给该通信系统的每个小区C。在图所示的该例中,将单一的基站B分配给每个小区,且这些小区通常具有六边形,故每个小区有六个相邻的,例如, 小区C1具有六个相邻的小区C2,C3,…,C7。在该基站B与每个小区中的各个活动的移动终端之间传输的信息包括数据部分和导频部分,而将该导频部分用于在该移动终端中的信道估算。在图1中所示的根据本发明的蜂窝通信系统的一例是正交频分复用系统,其中将整个频带细分为频率副载波,各个相邻的频率副载波是彼此正交的。
图1中所示的根据本发明的蜂窝通信系统的例子说明从各个基站B发送的数据部分的频率复用模式。将每个小区C1,C2,C3,…分为三个扇区。并将该无线蜂窝OFDM系统的整个频带分为三个副带。在每个小区的每个扇区中,将该三个副带的不同一个用于数据通信。在图1所示的该例中,将由d1表示的每个小区C1,C2,C3,…的下部扇区分配到第一副频带。将每个小区的右上扇区d2分配到第二副频带,将每个小区的左上扇区d3分配到第三副频带。将第一,第二和第三副频带相加得出在该OFDM系统中所用的整个频带。图1中所示的例子仅涉及从该基站B发送的数据部分。换句话说,在该第一副频带上发送在基站B与小区C1的第一扇区d1中的移动终端M之间交换的数据部分。这里图1中所示的频率复用模式只对该数据部分是有效的。必须注意,图1中所示的频率复用模式一般与图3中所示的频率复用模式对应。然而,图1中所示的模式只应用于数据部分的传输,而图3中所示的模式涉及数据部分和导频部分两者的传输。
结合图2说明根据本发明的导频模式的频率复用模式。图2的导频部分的频率复用模式表示图1的无线蜂窝OFDM通信系统。在该系统中的小区的一般表示对应于图1中所示的。然而,与数据部分的传输相反,只在整个小区中的三个副频带的一个中发送该导频模式。例如,在小区C1中,在所有三个扇区只在表示为P1的第一副频带内发送导频模式。所有相邻的小区C2,C3,…,C7使用各个不同的副频带来发送该导频模式。例如,相邻小区C3,C5和C7使用第二副频带发送该导频部分,而其它的相邻小区C2,C4和C6使用第三副频带发送该导频部分。因此对于导频部分的整个频带的划分与对于数据部分是相同的。然而,定义对于各个小区的副频带的分配的频率复用模式,对于数据部分和对于导频部分是不同的。例如,小区C1的基站的最低的扇区在第一副频带中发送数据部分,右上扇区在第二副频带中发送数据部分,左上扇区d3在第三副频带中发送数据部分。然而,该小区C1的相同基站B在所有三个扇区d1,d2和d3里都在该第一副频带中发送导频部分。因此,明显地减少了对于该导频部分传输的干扰,因为在对于该导频部分具有相同分配的副频带的两个小区(例如小区C1和C8)之间彼此总是有至少一个小区的间隔。对于该导频模式,邻近于小区C1的小区只发送导频部分和在第二及第三副频带中的能量。因此,根据在每个小区中的导频部分可执行至少为低干扰的甚至是无干扰的信道估算。因为对于数据部分的传输,将每个小区分成具有分配给它的不同副频带的三个扇区,故根据本发明系统的数据传输容量比导频部分传输容量高。因此,对于数据部分的传输比对于导频部分的传输其干扰的影响比较高。然而,在诸如移动终端M的接收终端里实现了对于相干OFDM解调的很可靠的精确的信道估算。
图1和2中所示的根据本发明的无线蜂窝OFDM通信系统的例子具有对数据部分的频率复用因数3,和对于导频部分的频率复用因数9。该频率复用因数取决于将该系统的整个频带分成的副频带的数量,和在一个小区中使用多少副频带。例如,对于图1中所示的数据部分频率复用模式,该整个频带的副频带的数量是三,在每个小区中用于数据部分的传输所用的副频带的数量也是三。则可将该频率复用因数计算为FRF=3。在图2中所示的同样系统的导频部分的频率复用模式对应于FRF=9的频率复用因数,因为在每个小区中只使用一个副频带。对于数据部分和导频部分的频率复用因数分别选择数量3和9只是一个例子,根据该系统的特定条件可用任何其它的数量。然而,对于具有如图1和2中所示的类似或相同蜂窝结构的无线蜂窝OFDM系统来说,鉴于一方面精确和正确的信道估算和另一方面高的数据速率传输,这些数量是有益的。
Claims (6)
1.一种基于正交频分复用(OFDM)方案的无线电信的蜂窝系统,包括多个基站(B),将至少一个基站(B)分配给该通信系统的每个小区(C),从所述基站传送的信息包括数据部分和导频部分,其特征在于:该数据部分的频率复用因数与该导频部分的频率复用因数不同。
2.根据权利要求1的蜂窝通信系统,其特征在于:该数据部分的频率复用因数比该导频的小。
3.根据权利要求1或2的蜂窝通信系统,其特征在于:该数据部分的频率复用因数是3,而该导频的频率复用因数是9。
4.一种用于操作基于正交频分复用(OFDM)方案的无线电信的蜂窝通信系统的方法,在该通信系统的小区中传输的信息包括数据部分和导频部分,其特征在于:该数据部分的频率复用因数与该导频部分的频率复用因数不同。
5.根据权利要求4的用于操作蜂窝通信系统的方法,其特征在于:该数据部分的频率复用因数小于该导频部分的频率复用因数。
6.根据权利要求4或5的用于操作蜂窝通信系统的方法,其特征在于:该数据部分的频率复用因数是3而该导频部分的频率复用因数是9。
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EP00116636.2 | 2000-08-01 | ||
EP00116636A EP1178641B1 (en) | 2000-08-01 | 2000-08-01 | Frequency reuse scheme for OFDM systems |
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CN1182688C CN1182688C (zh) | 2004-12-29 |
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US (1) | US6917580B2 (zh) |
EP (1) | EP1178641B1 (zh) |
JP (1) | JP2002111627A (zh) |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101336523A (zh) * | 2006-03-20 | 2008-12-31 | 富士通株式会社 | 基站及其mimo-ofdm通信方法 |
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2001
- 2001-07-30 US US09/919,263 patent/US6917580B2/en not_active Expired - Lifetime
- 2001-08-01 CN CNB01124738XA patent/CN1182688C/zh not_active Expired - Lifetime
- 2001-08-01 JP JP2001233989A patent/JP2002111627A/ja not_active Withdrawn
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Cited By (6)
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CN1759582B (zh) * | 2003-08-18 | 2012-04-04 | Lg电子株式会社 | 降低正交频分复用蜂窝环境中小区间干扰的子载波分配方法 |
CN1665228B (zh) * | 2003-12-23 | 2010-12-15 | 三星电子株式会社 | 根据频率再用率自适应分配子信道的装置和方法 |
CN101044780B (zh) * | 2004-04-22 | 2010-05-05 | Lg电子株式会社 | 在正交频分复用(ofdm)蜂窝式系统内分配子载波的方法 |
CN101336523A (zh) * | 2006-03-20 | 2008-12-31 | 富士通株式会社 | 基站及其mimo-ofdm通信方法 |
CN103138910A (zh) * | 2006-03-20 | 2013-06-05 | 富士通株式会社 | 基站、基站中的通信方法、移动站和移动站中的通信方法 |
CN103281169B (zh) * | 2006-03-20 | 2016-03-30 | 富士通株式会社 | 通信方法、基站、移动站以及无线通信系统 |
Also Published As
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US6917580B2 (en) | 2005-07-12 |
DE60035683T2 (de) | 2008-06-26 |
KR20020011350A (ko) | 2002-02-08 |
DE60035683D1 (de) | 2007-09-06 |
US20020034158A1 (en) | 2002-03-21 |
EP1178641B1 (en) | 2007-07-25 |
EP1178641A1 (en) | 2002-02-06 |
JP2002111627A (ja) | 2002-04-12 |
CN1182688C (zh) | 2004-12-29 |
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