CN1462513A - 用于估计移动无线信道的方法和移动无线接收装置 - Google Patents

用于估计移动无线信道的方法和移动无线接收装置 Download PDF

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CN1462513A
CN1462513A CN02801499A CN02801499A CN1462513A CN 1462513 A CN1462513 A CN 1462513A CN 02801499 A CN02801499 A CN 02801499A CN 02801499 A CN02801499 A CN 02801499A CN 1462513 A CN1462513 A CN 1462513A
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channel
impulse response
interpolation
mobile
time
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CN1215651C (zh
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高英杰
本杰明·施瓦兹
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Nokia Solutions and Networks Oy
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Siemens AG
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7113Determination of path profile
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7115Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7115Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明涉及一种用于在多径接收中估计移动无线电话信道的方法。根据所述方法,执行在两个相邻时间间隔(时隙1和时隙2)中根据各个脉冲响应确定的信道系数的内插。在所述内插之前,检查脉冲响应的各个分量以确定它们是否属于一个和同一传输路径,并仅仅对属于一个和同一传输路径的分量执行内插(1’和1”或3’和3”)。

Description

用于估计移动无线信道的方法和移动无线接收装置
本发明涉及,根据权利要求1的前序部分,一种用于估计移动无线信道的方法和一种移动无线接收装置。
在移动无线信道中,信号在实际工作中通过多个路径传播。每个单独的接收信号根据它的传输路径表现出不同的延迟、幅度和多普勒频移。各种接收的信号在接收机的天线在或建设性地或破坏性地叠加,结果,阻碍了通过信号发送的有用数据的检测。
具体而言,这样的无线信号多径传播产生信道脉冲响应,它们在时间上延展并导致时延扩展,因此导致在被发送的信号中的各个码元之间的漂移的时间关系。在根据宽带码分多址(W-CDMA)方法工作的移动无线系统中,专用的接收机(或RAKE(分离多径)接收机)因此被用于处理多径信号。
由于利用以不同的传播时延到达移动无线装置的接收天线的多径信号,这样的RAKE接收机提供显著的增益。为此,来自天线的信号在多个路径,所谓的RAKE接收机的  “手指”中被处理。这些手指的每个在每种情况下根据已经用于编码经由移动无线信道传输的信号的伪噪声序列的最佳相角被调整到每个接收的多径信号。
在IS-95移动无线系统中,移动台的RAKE接收机具有至少三个这样的手指,基站的RAKE接收机具有至少四个这样的手指。而且,在移动台和基站中的每个都具有至少一个“搜索手指”,它连续地搜索更强的多径信号。一旦搜索手指检测到一个更强的多径信号,则先前最弱的多径信号的手指被最佳地调整到这个新的更强的多径信号。一般,有可能通过这种方式解调移动台中最多3个最强多径信号以及基站中最多4个最强多径信号,并且具有至少0.8-1微秒的时延,而且有可能有利地通过最大比率组合来组合它们。
由于移动无线信道的时间变化和频率选择性,数据检测应当自适应和相干。为此,必须根据接收的信号估计时间离散信道脉冲响应,并且必须根据时间离散信道脉冲响应检测所发送的数据码元,前一个处理也被简称为信道估计。信道估计有精确的理论,参见例如P.Jung:“Analyse und Entwurf digitalerMobilfunksysteme”[数字移动无线系统的分析和设计(Analysis and Design ofDigital Mobile Radio Systems)],Stuttgart 1997,第5章。
只有在除了要发送的消息(有用数据)之外发送了对于接收机已知的消息分量时,才能有意义地使用用于信道估计的自适应相干数据检测器。这些消息分量随后被用于实际的信道估计并被称为训练序列。它们可以被定位在完整的用户信号(突发)的开始或中心。在现代W-CDMA(宽带码分多址)类型的多址系统中,所谓的导频比特在每种情况下在用于信道估计的发送时隙的开始和结尾被发送。这些导频比特被用于计算在各个时隙有效的信道系数。
为了更准确地估计传输信道,所计算的信道系数被内插在两个相邻时隙之间。如果用于内插的在相邻时隙计算的信道系数不沿着多径传播的相同路径传播,则这个内插会导致错误的结果。
为了说明这个问题,参见附图,其中两个相邻时隙时隙1和时隙2的脉冲响应被画出作为以码片为单位表示的时间的函数。在每种情况下时隙1和时隙2中的脉冲响应都具有三个波峰,它们被称为1’,2’和3’(时隙1中)以及1”,2”和3”(在时隙2中)。而波峰1”与1’相比较的位移是大约1/4码片,波峰2”与2’相比较的位移是大约1码片,波峰3”与3’之间没有位移。
根据发明人的调查,利用所有这些波峰(“手指”)用于在时隙1和2之间的信道系数的内插导致不正确的结果。
因此,本发明基于提供用于改进信道估计的方法的目的,提供更精确和可靠的结果。
所述目的通过具有权利要求1特征的方法实现。
本发明包括这样的基本概念,即在从脉冲响应计算的多个信道系数的任何内插之前,执行在两个时隙中的脉冲响应的比较检查以查看是否各个波峰可以被实际分配到相同的传播路径。仅仅那些在两个时隙中都可以被分配到一个和同一传输路径的信道脉冲响应的分量(尤其是波峰)被用于上述的内插。
最好本发明如下执行:确定在两个时隙之间的脉冲响应的各个波峰或手指的时间位移,然后区分各个时间位移值的阈值。
尤其是在波峰的时间位置(“手指位置”)的差别小于1/4码片的时候,假定根据手指位置确定的信道系数表示同一传输路径(本领域的专家有时也称之为“信道”)。因此,区别的预定阈值是1/4码片。
在上述的附图中,手指1’和1”以及3’和3”可以因此用于内插,但手指2’和2”不用于内插。
本发明作为装置的概念的实施例一般在软件中,但是它也可以至少部分被硬布线逻辑来支持。原则上,体现装置方面的移动无线接收装置可以实现在终端(移动电话)和基站中,因为原则上所述的信道估计可以不仅在上行链路而且在下行链路应用。

Claims (4)

1.一种用于在多径接收情况下估计移动无线信道的方法,其中执行根据各个脉冲响应在两个相邻时隙中确定的信道系数的内插,其特征在于:
在内插前,检查脉冲响应的各个分量以确定它们是否属于一个和同一传输路径,并仅仅对属于一个和同一传输路径的那些分量进行内插。
2.如权利要求1所述的方法,其特征在于:
所述检查包括确定在相邻时隙之间的脉冲响应的各个手指或波峰的时间位移,以及时间位移与预定的阈值的阈值区分。
3.如权利要求2所述的方法,其特征在于:
1/4码片的值被设置作为阈值区分的阈值。
4.一种移动无线接收装置,其中实现了前述权利要求之一的方法。
CNB028014995A 2001-05-10 2002-05-08 用于估计移动无线信道的方法和移动无线接收装置 Expired - Fee Related CN1215651C (zh)

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DE10122689.6 2001-05-10
DE10122689A DE10122689C2 (de) 2001-05-10 2001-05-10 Verfahren zur Kanalschätzung eines Mobilfunkkanals und Mobilfunk-Empfangsgerät

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102006247A (zh) * 2009-08-28 2011-04-06 株式会社东芝 传输路径响应估计器

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US20050169353A1 (en) * 2004-02-02 2005-08-04 Wei An Post despreading interpolation in CDMA systems
CN100356706C (zh) * 2005-05-26 2007-12-19 北京航空航天大学 基于线性调频序列的扩频通信系统中的分集接收方法

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US6208632B1 (en) * 1998-01-29 2001-03-27 Sharp Laboratories Of America System and method for CDMA channel estimation
JP3029031B2 (ja) * 1998-09-03 2000-04-04 日本電気株式会社 内挿同期検波方法と無線通信システム
DE19922184A1 (de) * 1999-05-12 2000-11-23 Siemens Ag Verfahren zur Schätzung von Kanalparametern
JP4284813B2 (ja) * 2000-02-18 2009-06-24 株式会社デンソー Ofdm用受信装置

Cited By (2)

* Cited by examiner, † Cited by third party
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CN102006247A (zh) * 2009-08-28 2011-04-06 株式会社东芝 传输路径响应估计器
CN102006247B (zh) * 2009-08-28 2014-01-29 株式会社东芝 传输路径响应估计器

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EP1393460A1 (de) 2004-03-03
JP3638587B2 (ja) 2005-04-13
WO2002091608A1 (de) 2002-11-14
JP2004519975A (ja) 2004-07-02
US20030186657A1 (en) 2003-10-02
DE10122689A1 (de) 2003-01-09
CN1215651C (zh) 2005-08-17

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