CN1203637C - 时隙cdma系统噪声空间相关特性估计方法 - Google Patents

时隙cdma系统噪声空间相关特性估计方法 Download PDF

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CN1203637C
CN1203637C CNB031147631A CN03114763A CN1203637C CN 1203637 C CN1203637 C CN 1203637C CN B031147631 A CNB031147631 A CN B031147631A CN 03114763 A CN03114763 A CN 03114763A CN 1203637 C CN1203637 C CN 1203637C
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王映民
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Datang Mobile Communications Equipment Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842Weighted combining
    • H04B7/0848Joint weighting
    • H04B7/0854Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/345Interference values
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0204Channel estimation of multiple channels
    • 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

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种时隙CDMA系统噪声空间相关特性估计方法,属于移动通信技术领域。主要包括如下步骤:对接收信号进行信道估计,得到原始的信道估计结果;按照信噪比门限或能量排序方法对原始信道估计结果进行处理,得到天线阵列的噪声响应矩阵;用天线阵列的噪声响应矩阵做相关运算得到噪声的空间相关矩阵。本发明利用时隙CDMA系统信道估计的特点,给出了一种时隙CDMA系统噪声空间特性的估计方法。这种方法简单有效,具有良好的数值稳定性,在系统实用的信噪比范围内给出良好的估计性能。

Description

时隙CDMA系统噪声空间相关特性估计方法
技术领域
本发明涉及的是一种时隙CDMA系统噪声空间相关特性估计方法,特别是一种采用多天线系统的时隙CDMA系统的噪声空间特性估计方法,属于移动通信技术领域。
背景技术
采用多天线系统技术可以极大地改进无线通信系统的性能。如果在多天线系统的空时处理中,不仅考虑本小区信号的空间特性,而且考虑其它小区干扰信号的空间特性,会使系统的性能进一步提高。实现上述空时处理的前提是测量和估计噪声(包括热噪声和干扰)的空间相关特性,即给出噪声的空间相关矩阵。在1995年2月出版的作者为P.Jung,J.Blanz的相关文献“Joint Detection withCoherent Receiver Antenna Diversity in CDMA Mobile Radio Systems(码分多址移动通信系统中采用相干天线分集接收的联合检测)IEEE Trans.Veh.Tech.,vol.44,pp.76-88”中讨论了采用智能天线的时隙CDMA系统中噪声空间相关矩阵的作用和特性。但是,该文献的技术在实现和仿真时,只做了假设噪声互不相关(即不考虑噪声相关特性)的情况,也没有给出噪声空间相关矩阵的测量和估计方法。在实际应用中,待求信号和噪声是叠加在一起的,即e=s+n。其中,e是总的接收信号,s信号分量,n是噪声分量。在实际测量和估计噪声的相关特性时,通常的做法是假设噪声是高斯分布且与信号互不相关。在这个条件下,有:
              E{n·n*T}=E{e·e*T}-E{s·s*T}
分析和仿真结果都表明,上述的噪声空间相关矩阵估计算法在信噪比增大时很不稳定,引起系统误码率性能的严重恶化。在实用的信噪比范围内,上面所述估计算法的性能不能满足系统的要求。
发明内容
本发明的目的在于克服现有技术中的不足,提出一种时隙CDMA系统噪声空间相关特性估计方法,使噪声空间相关矩阵估计算法在信噪比增大时也能够稳定而不引起系统误码率性能的恶化。从而在实用的信噪比范围内满足系统性能的要求。
本发明是根据以下的技术方案实现的,本发明的方法主要包括如下步骤:
步骤a.对接收信号进行信道估计,得到原始的信道估计结果;
步骤b.按照信噪比门限或能量排序方法对原始信道估计结果进行处理,得到天线阵列的噪声响应矩阵;
步骤c.用天线阵列的噪声响应矩阵做相关运算得到噪声的空间相关矩阵。
本发明利用时隙CDMA系统信道估计的特点,给出了一种时隙CDMA系统噪声空间特性的估计方法。这种方法简单有效,具有良好的数值稳定性,在系统实用的信噪比范围内给出良好的估计性能。
附图说明
图1本发明方法流程图
具体实施方式
如图1所示,本发明的方法具体包括如下步骤:
步骤a.对接收信号进行信道估计,得到原始的信道估计结果。记信道估计的原始结果为h″:
h″=(h″(1),h″(2),Λ,h″(ka),Λ,h″(Ka))T
其中h″(ka)为第ka个天线接收信号的信道估计:
h ′ ′ ( ka ) = ( h 1 ′ ′ ( ka ) , h 2 ′ ′ ( ka ) , Λ , h P ′ ′ ( ka ) ) T
其中hi(ka)为第ka个天线上信道估计第i个抽头的值,P为所用信道估计基本码的周期。
步骤b.对原始信道估计结果进行处理,得到天线阵列的噪声响应矩阵。具体方法如下:
首先对原始信道估计的处理,可以采用信噪比门限方法或能量排序方法。信噪比门限处理的方法为:把原始信道估计结果中低于门限的抽头置零。经过信噪比门限处理的信道估计h′与信道估计的原始结果为h″之间的关系为:
其中,ΓCHE 2为系统设定的门限值。记每个天线上信道估计保留的抽头数为P1。能量排序处理的方法为:只保留信道响应中能量较大的若干个抽头,而把其余抽头置零。系统设定一个抽头数为P1(0<P1<P),对信道响应的能量进行排序,由此得到其中能量较大的P1个抽头的位置序号为:{i1,i2,…,iP1}。经过能量排序处理的信道估计h′与信道估计的原始结果为h″之间的关系为:
Figure C0311476300062
然后记经过处理后的信道估计为h′,把上述两个信道估计结果相减,得到只含噪声和零的噪声响应矩阵N′:
N′=h″-h′
步骤c.用天线阵列的噪声响应矩阵做相关运算得到噪声的空间相关矩阵。记噪声空间相关矩阵RnS,具体计算方法为:
R ns = N ′ * N ′ H L 1 D
其中,H表示共扼转置,L1=P-P1,D为信道估计算法的噪声恶化因子。

Claims (7)

1.一种时隙CDMA系统噪声空间相关特性估计方法,其特征在于主要包括如下步骤:
步骤a.对接收信号进行信道估计,得到原始的信道估计结果;
步骤b.按照信噪比门限或能量排序方法对原始信道估计结果进行处理,得到天线阵列的噪声响应矩阵;
步骤c.用天线阵列的噪声响应矩阵做相关运算得到噪声的空间相关矩阵。
2.根据权利要求1所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,首先对接收信号进行信道估计,得到原始的信道估计结果,记信道估计的原始结果为h″:
h″=(h″(1),h″(2),Λ,h″(ka),Λ,h″(Ka))T
其中h″(ka)为第ka个天线接收信号的信道估计:
h ′ ′ ( ka ) = ( h 1 ′ ′ ( ka ) , h 2 ′ ′ ( ka ) , Λ , h P ′ ′ ( ka ) ) T
其中ht″(ka)为第ka个天线上信道估计第i个抽头的值,P为所用信道估计基本码的周期。
3.根据权利要求2所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,在步骤b中对原始信道估计的处理采用信噪比门限方法或能量排序方法。
4.根据权利要求3所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,信噪比门限处理的方法为:把原始信道估计结果中低于门限的抽头置零,第ka个天线上第i个抽头经过信噪比门限处理的信道估计结果hi(ka)通过如下算法获得:
Figure C031147630002C2
其中,ΓCHE 2为系统设定的门限值,Hi(ka)为第ka个天线上信道估计第i个抽头的值;
经过信噪比门限处理的信道估计结果h′为:
h′=(h′(1),h′(2),Λ,h′(ka),Λ,h′(Kα))T
5.根据权利要求3所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,能量排序处理的方法为:只保留信道响应中能量较大的若干个抽头,而把其余抽头置零,系统设定一个抽头数为P1,0<P1<P,对信道响应的能量进行排序,得到其中能量较大的P1个抽头的位置序号为:{i1,i2,…,iP1},则第ka个天线上第i个抽头经过能量排序处理的信道估计结果hi(ka)通过如下算法获得:
其中hi(ka)为第ka个天线上信道估计第i个抽头的值;
则经过能量排序处理的信道估计结果h′为:
h′=(h′(1),h′(2),Λ,h′(ka),Λ,h′(Kα))T
6.根据权利要求4或5所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,把所述经过处理的信道估计结果h′和原始信道估计的结果为h″相减,得到只含噪声和零的噪声响应矩阵N′。
7.根据权利要求1所述的这种时隙CDMA系统噪声空间相关特性估计方法,其特征是,记噪声空间相关矩阵RnS,在步骤c中用天线阵列的噪声响应矩阵做相关运算得到噪声的空间相关矩阵的具体计算方法为:
R ns = N ′ * N ′ H L 1 D
其中,H表示共扼转置,L1=P-P1,D为信道估计算法的噪声恶化因子。
CNB031147631A 2003-01-07 2003-01-07 时隙cdma系统噪声空间相关特性估计方法 Expired - Lifetime CN1203637C (zh)

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CNB031147631A CN1203637C (zh) 2003-01-07 2003-01-07 时隙cdma系统噪声空间相关特性估计方法
EP20040700430 EP1585245B1 (en) 2003-01-07 2004-01-07 Estimation method for noise space correlated characteristics in time slot cdma system
JP2005518615A JP4160979B2 (ja) 2003-01-07 2004-01-07 タイム・スロットcdmaシステムにおける雑音空間相関特性の推定方法
KR20057012526A KR100658651B1 (ko) 2003-01-07 2004-01-07 타임 슬롯 cdma시스템에서의 잡음 공간 상관 특성에대한 평가 방법
PCT/CN2004/000023 WO2004062152A1 (fr) 2003-01-07 2004-01-07 Procede d'estimation de caracteristiques de bruit en correlation avec l'espace dans un systeme d'amrc a creneaux temporels
US11/175,119 US7388900B2 (en) 2003-01-07 2005-07-05 Estimation method for space correlation characteristics of noise in a time slotted CDMA system

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CN1965501B (zh) * 2004-02-13 2012-07-04 日本电气株式会社 无线通信系统、接收设备、解调方法
CN100423602C (zh) * 2005-05-17 2008-10-01 上海原动力通信科技有限公司 应用于同频组网的波束赋形实现方法
CN101499817B (zh) * 2008-02-02 2012-09-26 大唐移动通信设备有限公司 一种同步cdma接收系统中的解调方法及装置
CN102177664B (zh) * 2011-04-21 2013-06-26 华为技术有限公司 干扰噪声序列矩阵相关计算电路和方法
US9185614B2 (en) * 2011-11-10 2015-11-10 Qualcomm Incorporated Computation of measurement metrics for wireless networks
US9614700B2 (en) * 2013-01-02 2017-04-04 Qualcomm Incorporated Techniques for channel estimation in millimeter-wave communication systems

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5796788A (en) * 1996-04-19 1998-08-18 Ericsson Inc. Method and apparatus for interference decorrelation in time and space
FR2758926B1 (fr) 1997-01-24 1999-04-30 France Telecom Procede d'egalisation multicapteurs dans un recepteur radioelectrique comportant un nombre determine de voies de reception et recepteur correspondant
FR2762167B1 (fr) * 1997-04-14 1999-09-24 Nortel Matra Cellular Sondage a ponderation spatiale d'une voie de transmission
CN1053313C (zh) * 1997-04-21 2000-06-07 北京信威通信技术有限公司 具有智能天线的时分双工同步码分多址无线通信系统及其通信方法
DE19952949A1 (de) * 1999-11-03 2001-05-10 Siemens Ag Verfahren zur Leistungs- und/oder Interferenz-Schätzung in einem TD/CDMA-basierten Funk-Kommunikationssystem
US6907092B1 (en) 2000-07-14 2005-06-14 Comsys Communication & Signal Processing Ltd. Method of channel order selection and channel estimation in a wireless communication system
CN1124709C (zh) * 2000-10-20 2003-10-15 华为技术有限公司 提高无线移动通信系统中信道估计精度的方法
US6907270B1 (en) * 2000-10-23 2005-06-14 Qualcomm Inc. Method and apparatus for reduced rank channel estimation in a communications system
US7133459B2 (en) * 2001-05-01 2006-11-07 Texas Instruments Incorporated Space-time transmit diversity
EP1300999A1 (en) * 2001-10-05 2003-04-09 Siemens Information and Communication Networks S.p.A. Channel estimation
US20030125040A1 (en) * 2001-11-06 2003-07-03 Walton Jay R. Multiple-access multiple-input multiple-output (MIMO) communication system

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JP4160979B2 (ja) 2008-10-08
KR20050089869A (ko) 2005-09-08
KR100658651B1 (ko) 2006-12-15
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US7388900B2 (en) 2008-06-17
JP2006515968A (ja) 2006-06-08
CN1424828A (zh) 2003-06-18

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