CN1272005A - 迭代信道估算以及基于信道估算的补偿 - Google Patents
迭代信道估算以及基于信道估算的补偿 Download PDFInfo
- Publication number
- CN1272005A CN1272005A CN00106910A CN00106910A CN1272005A CN 1272005 A CN1272005 A CN 1272005A CN 00106910 A CN00106910 A CN 00106910A CN 00106910 A CN00106910 A CN 00106910A CN 1272005 A CN1272005 A CN 1272005A
- Authority
- CN
- China
- Prior art keywords
- channel estimation
- signal
- data
- estimation
- produces
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
- H04L25/0236—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols using estimation of the other symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
Abstract
信道估算的方法从接收信号中的导频信号来生产初始信道估算,并且使用信道估算来估算接收信号中的数据。然后从估算的数据获得一个更新的信道估算。这种估算数据和重新估算信道估算的过程重复所需的次数以改进信道估算的精度。
Description
本发明涉及无线通讯领域,尤其涉及信道估算以及基于信道估算的补偿的方法。
近几十年来,已经提出了许多新的技术如多载波传输和智能天线算法来增加多用户无线通讯系统的容量。然而,由这些新技术允诺的性能改进通常受到信道估算的精度的限制。信道估算是一个信号的发射机和接收机之间的失真的估算,这个失真是由发射信号经过的物理信道或介质引入的。使用这种失真估算(即信道估算),接收机可以去除某些这种失真并且改进接收信号的精度。即使在信道补偿中很小的改进也可以为例如多用户技术带来明显的好处。
因为在无线通讯系统中移动站的移动,物理信道经常变化。如果希望对物理信道的失真进行相干检测,则必须跟踪失真的相位。由于跟踪失真相位很困难,当前美国的码分多址CDMA标准IS-95在系统的上行链路(到基站的通讯)使用非相干检测。非相干检测估算接收信号中的数据码元而不用考虑物理信道的失真。
然而,非相干检测就信噪比SNR而论受到不良性能的影响,而SNR性能直接与CDMA系统的容量相关。这样,新一代CDMA标准,CDMA 2000已经提出在系统的上行链路进行相干检测。为了完成相干检测,已经提出将导频信号用在系统的上行链路。因此,使用导频信号,可以完成一种简单形式的称为导频辅助检测的相干检测。
将来自给定移动站的基站的总接收信号表示为:
r(t)=α(t)[p(t)+j·s(t)]+n(t) (1)
这里α(t)是假定为复数高斯随机过程(GRP)的时变复数信道失真,s(t)是所关心的数据信号,p(t)是未调制的导频信号,而n(t)是假定为GRP的噪声加干扰。另外,定义p(t)和s(t)使得它们在某些预定间隔即Ti上是正交的, 和 这里εp是在Ti上归一化的导频能量。
获得信道估算,就获得了数据信号s(t)的估算s(t),数据信号定义为:
如前面讨论的,由于从信道估算中甚至很小的改进也可以获得明显的好处,所以要求改进导频辅助检测方法。
本发明的信道估算方法使用接收信号中的导频信号来进行初始信道估算,并且产生接收信号中数据的估算。然后从该估算的数据获得另一个信道估算。这种估算数据和重新估算信道估算的过程要重复所需的次数以改进信道估算的精度。
另外,在本发明的另一个实施例中,在从估算的数据产生信道估算之后,获得一个自适应的信道估算。根据两个最近产生的信道估算产生自适应的信道估算。可以确定自适应级别来进一步改进信道估算的精度并且减少本发明方法所应用的无线通讯系统中的信噪比。
参照说明的附图和下面给出的详细描述可以很好地理解本发明,其中在不同图中相同的参考标号表示相同的部件,其中:
图1说明了本发明用于产生信道估算和完成信道估算补偿的装置;
图2说明了本发明的信道估算以及补偿方法的第一个实施例的流程图;以及
图3说明了本发明的信道估算方法的第二个实施例的流程图。
图1说明了本发明用于产生信道估算和完成信道估算补偿的装置。如所示,初始信道估算器10接收一个信号,该信号包括了满足方程式(2)的至少一个导频信号和一个数据信号。初始信道估算器10产生和提供到数据估算器12的输出。数据估算器12将输出提供给更新信道估算器14并且接收来自更新信道估算器14的输出。数据估算器12还提供输出信号。
根据图2描述图1中说明的装置的工作。图2说明了本发明的信道估算以及补偿的方法的流程图。如所示,在步骤S20,初始信道估算器10使用接收信号中的导频信号初始估算物理信道中的失真。初始信道估算器10使用任何公知的信道估算方法来产生信道估算,该方法使用如前面描述的导频辅助检测方法中的导频信号。最好但不是必需的,根据块更新的线性回归方法产生初始信道估算,该方法同时由本申请发明人的标题为“信道估算和基于它的补偿的方法”公开,它的专利号还不知道,全部在此作为参考。应该注意在一些标准中,导频信号可以包括功率控制位。最好但不是必需的,在确定初始信道估算时忽略这些位。
接着,在步骤S25,使用初始信道估算,数据估算器12根据方程式(5)和(6)估算数据。对于估算的数据,数据估算器12设置计数值C为零。
在步骤S35,当确定用于估算数据的计数值C小于某一预定门限值(根据设计者的选择设置的一个设计参数)之后,数据估算器12发送估算的数据和相关的计数值C到更新信道估算器14。在步骤S40,更新信道估算器14使用任何公知的信道估算方法,根据从数据估算器12接收的估算数据产生一个更新的信道估算。最好但不是必需的,使用上面提到的块更新线性回归方法。另一种情况,根据下面的方程式(7)产生更新的信道估算:
然后在步骤S45,更新信道估算器14将与估算数据相关的计数值C加1,并且发送更新的信道估算和计数值C到数据估算器12。在步骤S50,数据估算器12使用更新的信道估算对估算的数据重新估算。
重复步骤S35-S50的处理直到数据估算器12确定用于估算数据的计数值C超过预定的门限值为止。当超过预定的门限值时,数据估算器12输出估算的数据作为输出信号。
图3说明了本发明的信道估算方法的第二个实施例的流程图。更准确地说,图3示出了对图2流程图的修改而得到的第二个实施例。因此,为了简便起见仅对这些修改进行详细的讨论。
如所示,在步骤S25之后,在步骤S27初始信道估算器10将初始信道估算存储在可到达更新信道估算器14的存储器(未示出)中。然后如上所述该方法继续步骤S30。
然后,在步骤S40之后,在步骤S43更新信道估算器14使用在步骤S40产生的更新的信道估算和存储的信道估算来产生自适应的信道估算,并且存储自适应的信道估算在存储器(未示出)中。当计数值是零时,存储的信道估算是初始信道估算。然而,当计数值大于零时,存储的信道估算将是先前产生的自适应信道估算。更新信道估算器14根据下面的方程式(8)产生自适应的信道估算:
这里
是自适应的信道估算,
是存储的信道估算,
是在步骤S40确定的更新的信道估算,而δ是一个指示自适应信道估算的自适应级别的因子。很容易理解如果δ选择为零,则在图3说明的第二种方法变得与相对于图2讨论的第一种方法相同。因子δ是一个设计参数,它根据设计者的选择设置。
一种设置δ的方法是使用一个δ值,该值反映用于估算的两个信号的SNR,即
这里γp是导频信号的SNR而γs是数据的SNR。更准确地说, 和
这里Pp是在导频信号的发射功率,Ps是在数据信号的发射功率,而σ2是噪声方差,这导出了
第二种方法是使用实际信道估算的SNR,也就是
这里E{}是期望值。然而,最好但不是必需的,根据经验确定γ′(i)和γ′(i-1)。
在步骤S43确定了自适应信道估算之后,在步骤S45将计数值C加1。然后自适应信道估算和计数值C发送到数据估算器12。在步骤S50’,除了自适应信道估算用于估算数据而不是更新的信道估算以外,数据估算器12以相对于图2的步骤S50中上面描述的相同方式工作。
信道估算的迭代方法还改进了初始信道估算的精度,并且提供了公知的信道估算技术的改进。因此,本发明方法对于例如多用户技术提供了明显的好处。
应该理解本发明方法可以由具有足够存储容量的适当编程的数字信号处理器或ASIC实现,并且该数字信号处理器或ASIC驻留在发射信号的接收机中。因此,本发明方法可以由使用下行链路导频信号的无线通讯系统的移动站和使用上行链路导频信号的无线通讯系统的基站使用。
Claims (10)
1.一种用于迭代信道估算的方法,包括:
a)使用接收信号中的导频信号来产生初始信道估算;
b)使用所述初始信道估算来产生与所述导频信号相关的数据信号的估算;以及
c)根据所述估算的数据信号来产生新的信道估算。
2.如权利要求1所述的方法,还包括:
d)根据所述新的信道估算来产生所述数据信号的估算;
e)根据在步骤d)中估算的所述数据信号来产生信道估算作为所述新的信道估算。
3.如权利要求2所述的方法,还包括:
f)重复步骤d)和e)预定的次数。
4.如权利要求1所述的方法,还包括:
d)根据所述初始信道估算和在步骤c)产生的所述新的信道估算来自适应地产生信道估算。
5.如权利要求4所述的方法,还包括:
f)根据当前自适应产生的信道估算来产生所述数据信号的估算;
g)根据在步骤(f)估算的所述数据信号来产生信道估算;
h)根据在步骤g)产生的所述信道估算和所述当前自适应产生的信道估算来自适应地产生信道估算作为所述当前自适应产生的信道估算。
6.如权利要求5所述的方法,还包括:
i)重复步骤f)、g)和h)预定的次数。
7.如权利要求4所述的方法,其中所述步骤d)根据所述导频信号和所述数据信号的诸信噪比自适应地产生所述信道估算。
8.如权利要求5所述的方法,其中所述步骤f)包括:
f1)确定在所述导频信号中N个样本块的线性回归系数;以及
f2)根据对于所述N个块的所述线性回归系数来获得信道估算。
9.如权利要求1所述的方法,其中所述步骤a)包括:
a1)确定在所述导频信号中N个样本块的线性回归系数;以及
a2)根据对于所述N个块的所述线性回归系数来获得信道估算。
10.如权利要求1所述的方法,其中所述步骤c)包括:
c1)确定在所述导频信号中N个样本块的线性回归系数;以及
c2)根据对于所述N个块的所述线性回归系数来获得信道估算。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/296,409 US6614857B1 (en) | 1999-04-23 | 1999-04-23 | Iterative channel estimation and compensation based thereon |
US09/296,409 | 1999-04-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN1272005A true CN1272005A (zh) | 2000-11-01 |
Family
ID=23141889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN00106910A Pending CN1272005A (zh) | 1999-04-23 | 2000-04-21 | 迭代信道估算以及基于信道估算的补偿 |
Country Status (8)
Country | Link |
---|---|
US (1) | US6614857B1 (zh) |
EP (1) | EP1047233A3 (zh) |
JP (1) | JP2000349695A (zh) |
KR (1) | KR100711014B1 (zh) |
CN (1) | CN1272005A (zh) |
AU (1) | AU2780200A (zh) |
BR (1) | BR0002749A (zh) |
CA (1) | CA2306027A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7830976B2 (en) | 2004-07-16 | 2010-11-09 | Qualcomm Incorporated | Iterative channel and interference estimation with dedicated pilot tones for OFDMA |
Families Citing this family (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6614857B1 (en) * | 1999-04-23 | 2003-09-02 | Lucent Technologies Inc. | Iterative channel estimation and compensation based thereon |
US20020006121A1 (en) * | 2000-04-27 | 2002-01-17 | Dileep George | Adaptive diversity combining for wide band code division multiple access (W-CDMA) based on iterative channel estimation |
US7295509B2 (en) | 2000-09-13 | 2007-11-13 | Qualcomm, Incorporated | Signaling method in an OFDM multiple access system |
US9130810B2 (en) | 2000-09-13 | 2015-09-08 | Qualcomm Incorporated | OFDM communications methods and apparatus |
WO2002049301A1 (fr) * | 2000-12-14 | 2002-06-20 | Linkair Communications, Inc. | Procede d'estimation de voies |
DE60127932T2 (de) * | 2001-02-27 | 2008-04-03 | Freescale Semiconductor, Inc., Austin | Kanalschätzung in Systemen mit orthogonalen Frequenzmultiplexsignalen |
US7027519B2 (en) * | 2001-02-28 | 2006-04-11 | Mitsubishi Electric Research Laboratories, Inc. | Iterative maximum likelihood channel estimation and signal detection for OFDM systems |
US7184497B2 (en) * | 2001-05-04 | 2007-02-27 | Lucent Technologies Inc. | Method of estimating a signal-to-interference+noise ratio (SINR) |
US7379513B2 (en) * | 2001-05-23 | 2008-05-27 | Chao Wang, legal representative | Channel estimation in CDMA communications systems using both lower power pilot channel and higher power date channel |
US6940914B1 (en) | 2001-06-11 | 2005-09-06 | Cingular Wireless Ii, Llc | Turbo channel estimation for OFDM systems |
US7224942B2 (en) * | 2001-07-26 | 2007-05-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Communications system employing non-polluting pilot codes |
US7092436B2 (en) * | 2002-01-25 | 2006-08-15 | Mitsubishi Electric Research Laboratories, Inc. | Expectation-maximization-based channel estimation and signal detection for wireless communications systems |
AU2003903826A0 (en) * | 2003-07-24 | 2003-08-07 | University Of South Australia | An ofdm receiver structure |
KR100535638B1 (ko) * | 2002-06-19 | 2005-12-08 | 주식회사 케이티 | 무선 랜 시스템을 위한 직교주파수분할다중화 동기복조방법 및 그 장치 |
US20040165683A1 (en) * | 2002-09-04 | 2004-08-26 | Gupta Alok Kumar | Channel estimation for communication systems |
KR20060009336A (ko) * | 2003-05-14 | 2006-01-31 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | 심볼 검출 방법, 심볼 검출 장치, 통신 수신기 및 셀룰러전화 세트 |
US7215646B2 (en) * | 2003-11-05 | 2007-05-08 | Interdigital Technology Corporation | Method and apparatus for estimating and reporting the quality of a wireless communication channel |
US7352829B2 (en) | 2004-01-12 | 2008-04-01 | Infineon Technologies Ag | Data-aided channel estimation |
US7346129B2 (en) | 2004-02-25 | 2008-03-18 | Broadcom Corporation | Payload based channel estimation of a wireless channel |
TWI279998B (en) * | 2004-05-25 | 2007-04-21 | Realtek Semiconductor Corp | Adaptive channel estimation method for multi-carrier communication system |
US7392450B2 (en) * | 2004-07-08 | 2008-06-24 | Via Technologies, Inc. | Method and apparatus of compensating for signal receiving error at receiver in packet-based communication system |
US9148256B2 (en) | 2004-07-21 | 2015-09-29 | Qualcomm Incorporated | Performance based rank prediction for MIMO design |
US9137822B2 (en) | 2004-07-21 | 2015-09-15 | Qualcomm Incorporated | Efficient signaling over access channel |
US9246560B2 (en) | 2005-03-10 | 2016-01-26 | Qualcomm Incorporated | Systems and methods for beamforming and rate control in a multi-input multi-output communication systems |
US9154211B2 (en) | 2005-03-11 | 2015-10-06 | Qualcomm Incorporated | Systems and methods for beamforming feedback in multi antenna communication systems |
US8446892B2 (en) | 2005-03-16 | 2013-05-21 | Qualcomm Incorporated | Channel structures for a quasi-orthogonal multiple-access communication system |
US9461859B2 (en) | 2005-03-17 | 2016-10-04 | Qualcomm Incorporated | Pilot signal transmission for an orthogonal frequency division wireless communication system |
US9143305B2 (en) | 2005-03-17 | 2015-09-22 | Qualcomm Incorporated | Pilot signal transmission for an orthogonal frequency division wireless communication system |
US9520972B2 (en) | 2005-03-17 | 2016-12-13 | Qualcomm Incorporated | Pilot signal transmission for an orthogonal frequency division wireless communication system |
US9184870B2 (en) | 2005-04-01 | 2015-11-10 | Qualcomm Incorporated | Systems and methods for control channel signaling |
US9408220B2 (en) | 2005-04-19 | 2016-08-02 | Qualcomm Incorporated | Channel quality reporting for adaptive sectorization |
US9036538B2 (en) | 2005-04-19 | 2015-05-19 | Qualcomm Incorporated | Frequency hopping design for single carrier FDMA systems |
US8611284B2 (en) | 2005-05-31 | 2013-12-17 | Qualcomm Incorporated | Use of supplemental assignments to decrement resources |
US8565194B2 (en) | 2005-10-27 | 2013-10-22 | Qualcomm Incorporated | Puncturing signaling channel for a wireless communication system |
US8879511B2 (en) | 2005-10-27 | 2014-11-04 | Qualcomm Incorporated | Assignment acknowledgement for a wireless communication system |
US8462859B2 (en) | 2005-06-01 | 2013-06-11 | Qualcomm Incorporated | Sphere decoding apparatus |
US8599945B2 (en) | 2005-06-16 | 2013-12-03 | Qualcomm Incorporated | Robust rank prediction for a MIMO system |
US9179319B2 (en) | 2005-06-16 | 2015-11-03 | Qualcomm Incorporated | Adaptive sectorization in cellular systems |
US8885628B2 (en) | 2005-08-08 | 2014-11-11 | Qualcomm Incorporated | Code division multiplexing in a single-carrier frequency division multiple access system |
US9209956B2 (en) | 2005-08-22 | 2015-12-08 | Qualcomm Incorporated | Segment sensitive scheduling |
US20070041457A1 (en) | 2005-08-22 | 2007-02-22 | Tamer Kadous | Method and apparatus for providing antenna diversity in a wireless communication system |
US8644292B2 (en) | 2005-08-24 | 2014-02-04 | Qualcomm Incorporated | Varied transmission time intervals for wireless communication system |
US9136974B2 (en) | 2005-08-30 | 2015-09-15 | Qualcomm Incorporated | Precoding and SDMA support |
US9225416B2 (en) | 2005-10-27 | 2015-12-29 | Qualcomm Incorporated | Varied signaling channels for a reverse link in a wireless communication system |
US8477684B2 (en) | 2005-10-27 | 2013-07-02 | Qualcomm Incorporated | Acknowledgement of control messages in a wireless communication system |
US9144060B2 (en) | 2005-10-27 | 2015-09-22 | Qualcomm Incorporated | Resource allocation for shared signaling channels |
US9172453B2 (en) | 2005-10-27 | 2015-10-27 | Qualcomm Incorporated | Method and apparatus for pre-coding frequency division duplexing system |
US9210651B2 (en) | 2005-10-27 | 2015-12-08 | Qualcomm Incorporated | Method and apparatus for bootstraping information in a communication system |
US9225488B2 (en) | 2005-10-27 | 2015-12-29 | Qualcomm Incorporated | Shared signaling channel |
US9088384B2 (en) | 2005-10-27 | 2015-07-21 | Qualcomm Incorporated | Pilot symbol transmission in wireless communication systems |
US8582509B2 (en) | 2005-10-27 | 2013-11-12 | Qualcomm Incorporated | Scalable frequency band operation in wireless communication systems |
US8693405B2 (en) | 2005-10-27 | 2014-04-08 | Qualcomm Incorporated | SDMA resource management |
US8045512B2 (en) | 2005-10-27 | 2011-10-25 | Qualcomm Incorporated | Scalable frequency band operation in wireless communication systems |
US8582548B2 (en) | 2005-11-18 | 2013-11-12 | Qualcomm Incorporated | Frequency division multiple access schemes for wireless communication |
US8831607B2 (en) | 2006-01-05 | 2014-09-09 | Qualcomm Incorporated | Reverse link other sector communication |
EP2109972A1 (en) * | 2007-02-12 | 2009-10-21 | Nokia Corporation | Shared control channel data-assisted channel estimation |
US7764747B2 (en) | 2007-03-30 | 2010-07-27 | Olympus Corporation | Methods and systems for transmitting and processing pilot signals |
EP2149219A2 (en) * | 2007-04-19 | 2010-02-03 | InterDigital Technology Corporation | Method and apparatus for performing jrnso in fdd, tdd and mimo communications |
KR100929777B1 (ko) * | 2007-11-26 | 2009-12-03 | 한국전자통신연구원 | 무선통신에서의 다단계 채널 추정 방법 및 다단계 채널추정 시스템 |
US8761274B2 (en) * | 2009-02-04 | 2014-06-24 | Acorn Technologies, Inc. | Least squares channel identification for OFDM systems |
DE102018206132B4 (de) * | 2018-04-20 | 2019-11-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Decodergestützte iterative Kanalschätzung |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5581580A (en) | 1993-05-20 | 1996-12-03 | Telefonaktiebolaget Lm Ericsson | Low complexity model based channel estimation algorithm for fading channels |
SE503522C2 (sv) * | 1994-10-31 | 1996-07-01 | Ericsson Telefon Ab L M | Förfarande och anordning för kanalestimering |
US5754599A (en) * | 1996-01-04 | 1998-05-19 | Motorola, Inc. | Method and apparatus for coherent channel estimation in a communication system |
US5687198A (en) * | 1996-01-04 | 1997-11-11 | Motorola, Inc. | Channel estimation in a communication system |
US5901185A (en) * | 1996-04-15 | 1999-05-04 | Ericsson Inc. | Systems and methods for data-augmented, pilot-symbol-assisted radiotelephone communications |
US5771461A (en) * | 1996-06-28 | 1998-06-23 | Motorola, Inc. | Method and apparatus for power control of a first channel based on a signal quality of a second channel |
US6331975B1 (en) * | 1998-10-28 | 2001-12-18 | Texas Instruments Incorporated | User data indicator for discontinuous transmission |
US6243444B1 (en) * | 1999-04-08 | 2001-06-05 | International Thinklink Corporation | Apparatus and method for local intercept and service of long-distance calls |
US6614857B1 (en) * | 1999-04-23 | 2003-09-02 | Lucent Technologies Inc. | Iterative channel estimation and compensation based thereon |
US6542560B1 (en) * | 1999-04-23 | 2003-04-01 | Lucent Technologies Inc. | Method of channel estimation and compensation based thereon |
US6157847A (en) * | 1999-06-29 | 2000-12-05 | Lucent Technologies Inc. | Base station system including parallel interference cancellation processor |
US6314131B1 (en) * | 2000-03-24 | 2001-11-06 | Cadence Design Systems, Inc. | Method and system for channel estimation using multi-slot averaged interpolation |
-
1999
- 1999-04-23 US US09/296,409 patent/US6614857B1/en not_active Expired - Lifetime
-
2000
- 2000-04-12 BR BR0002749-9A patent/BR0002749A/pt not_active Application Discontinuation
- 2000-04-17 AU AU27802/00A patent/AU2780200A/en not_active Abandoned
- 2000-04-18 EP EP00303293A patent/EP1047233A3/en not_active Withdrawn
- 2000-04-18 CA CA002306027A patent/CA2306027A1/en not_active Abandoned
- 2000-04-20 KR KR1020000020964A patent/KR100711014B1/ko not_active IP Right Cessation
- 2000-04-21 CN CN00106910A patent/CN1272005A/zh active Pending
- 2000-04-24 JP JP2000123005A patent/JP2000349695A/ja not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7830976B2 (en) | 2004-07-16 | 2010-11-09 | Qualcomm Incorporated | Iterative channel and interference estimation with dedicated pilot tones for OFDMA |
CN101019390B (zh) * | 2004-07-16 | 2013-01-02 | 高通股份有限公司 | 利用ofdm专用导频音调的迭代信道和干扰估计 |
Also Published As
Publication number | Publication date |
---|---|
BR0002749A (pt) | 2000-12-19 |
JP2000349695A (ja) | 2000-12-15 |
EP1047233A3 (en) | 2002-01-16 |
KR20000077054A (ko) | 2000-12-26 |
US6614857B1 (en) | 2003-09-02 |
CA2306027A1 (en) | 2000-10-23 |
KR100711014B1 (ko) | 2007-04-25 |
EP1047233A2 (en) | 2000-10-25 |
AU2780200A (en) | 2000-10-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN1272005A (zh) | 迭代信道估算以及基于信道估算的补偿 | |
CN101119130B (zh) | 在无线通信系统中的自适应信道估计 | |
US9473268B2 (en) | Transmitting apparatus, receiving apparatus, transmission method, and reception method | |
CN1049545C (zh) | 一种在数字信号传输的接收机中估计所传输的符号的方法和设备 | |
US7680218B2 (en) | Method and apparatus for communication channel estimation | |
EP1617611A2 (en) | Propagation path estimation method and apparatus | |
CN1236242A (zh) | 叠代信道估算 | |
CN1130853C (zh) | 干扰的时间和空间去相关方法和设备 | |
CN1433619A (zh) | 带有直流偏移补偿的均衡 | |
KR20040005339A (ko) | 이동통신시스템의 적응형 채널 추정장치 및 방법 | |
CN1346547A (zh) | 移动通信系统中的近似mmse信道估计器 | |
US6442218B1 (en) | Demodulator | |
KR100662223B1 (ko) | 채널 추정 방법 및 채널 추정에 기초한 보상 방법 | |
KR100576014B1 (ko) | 이동통신 시스템에서 심볼 단위의 결정 경계값 추정을위한 장치 및 방법 | |
KR20070090800A (ko) | 무선통신시스템에서 채널 추정 장치 및 방법 | |
EP1943794A2 (en) | Noise power interpolation in a multi-carrier system | |
CN1159870A (zh) | 干扰消除方法和接收机 | |
KR19990023276A (ko) | 수신장치, 무선통신 시스템 및 통신방법 | |
EP1197026B1 (en) | Method and apparatus for channel estimation with transmit diversity | |
CN109428679B (zh) | ZigBee自适应多速率传输方法 | |
CN106302286A (zh) | 一种ofdm系统的信噪比盲估计方法 | |
Chang et al. | 2D regression channel estimation for equalizing OFDM signals | |
CN100493052C (zh) | 一种弱能量并行pn序列进行信道估计的方法 | |
CN1661996A (zh) | 一种正交振幅调制方式下的信噪比估计方法 | |
CN101156315A (zh) | 基准码元辅助的信道估计方法和装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |