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公开(公告)号：WO2009101049A3
公开(公告)日：2009-12-17
申请号：PCT/EP2009051443
申请日：2009-02-09
Applicant: ERICSSON TELEFON AB L M , WACHSMANN UDO
Inventor： WACHSMANN UDO
IPC: H04L25/06
CPC classification number: H04L25/067 , H04L1/0045 , H04L1/0066 , H04L1/1812
Abstract: A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.
Abstract translation: 提出了一种用于在衰落信道环境中确定用于软比特量化的缩放因子的技术。 在方法实现中，该技术包括重复地确定衰落信道的SNR值，基于多个SNR值来计算加权平均值，其中执行加权，使得极值SNR值的贡献被衰减，并且确定缩放因子 用于取决于加权平均值的软位量化。
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公开(公告)号：WO0230032A3
公开(公告)日：2002-08-29
申请号：PCT/EP0111462
申请日：2001-10-04
Applicant: ERICSSON TELEFON AB L M , THIELECKE JOERN , WACHSMANN UDO , SCHOTTEN HANS
Inventor： THIELECKE JOERN , WACHSMANN UDO , SCHOTTEN HANS
CPC classification number: H04L1/0625 , H04B1/707 , H04B1/7115 , H04J13/0077 , H04L1/0009 , H04L27/2601
Abstract: A space-time coding method is proposed, in which data streams are subject to orthogonal transformation before the coding. Combinations with multicarrier and multicode transmission, and with adaptive channel coding are also described.
Abstract translation: 提出了一种时空编码方法，其中数据流在编码之前经过正交变换。 还描述了与多载波和多码传输以及自适应信道编码的组合。
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公开(公告)号：WO2010069379A3
公开(公告)日：2010-09-10
申请号：PCT/EP2008067852
申请日：2008-12-18
Applicant: ERICSSON TELEFON AB L M , MUELLER-WEINFURTNER STEFAN , WACHSMANN UDO , RHEINHARDT STEFFEN
Inventor： MUELLER-WEINFURTNER STEFAN , WACHSMANN UDO , RHEINHARDT STEFFEN
IPC: H04L1/18
CPC classification number: H04L1/1835 , H04L1/1812 , H04L1/1822
Abstract: A communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfil at least one relevance criteria are not maintained in the storage unit (104).
Abstract translation: 一种用于根据混合自动重复请求协议通信的通信设备（100），所述通信设备（100）包括适于接收包括软比特值的通信消息的接收单元（102），所述软比特值表示可靠性 用于验证通信消息的正确传输的接收验证数据的信息;适于存储软比特值的存储单元（104）;以及存储管理单元（106），适于动态地管理存储在所述存储器中的软比特值的存储 单元（104），使得不能满足至少一个相关性准则的软比特值不保持在存储单元（104）中。
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公开(公告)号：WO03015335A8
公开(公告)日：2004-04-08
申请号：PCT/EP0208211
申请日：2002-07-23
Applicant: ERICSSON TELEFON AB L M , PAULI MATHIAS , WACHSMANN UDO
Inventor： PAULI MATHIAS , WACHSMANN UDO
CPC classification number: H04L25/0204 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L27/2662
Abstract: A method and a stage (60) for estimating channel coefficients in a multi carrier system operating in accordance with a block-code based transmit diversity scheme, in which a data content of a code matrix is multiplexed in a frequency domain are described. The method comprises determining a phase ramp (phi¿est
Abstract translation: 描述了一种用于估计在根据基于块码的发射分集方案操作的多载波系统中的信道系数的方法和阶段（60），其中码矩阵的数据内容在频域中多路复用。 该方法包括确定频域中的相位斜坡（phiestest）或时域中的等效（Deltat），相位斜坡（phiestest）或等效（Deltat）包括在接收器内 信号（Y），处理接收信号（Y_Deltat？）以去除相位斜坡（phiestest）或其等效（Deltat），并基于处理的接收信号估计信道系数。
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公开(公告)号：CA2353611C
公开(公告)日：2011-02-01
申请号：CA2353611
申请日：1999-12-04
Applicant: ERICSSON TELEFON AB L M
Inventor： SCHRAMM PETER , WACHSMANN UDO
Abstract: The present invention involves a forward error correction technique for use in wireless telecommunications systems, where a first convolutional coding scheme is applied to the bits in a first portion of a data block and a second convolutional coding scheme is applied to the bits in a second portion of the data block, and where the second portion of the data block may encompass a part of the data block or the entire data block, including the first portion. The first and the second coding scheme may be implemented using the same convolutional coding scheme with a first and a second puncturing scheme respectively. While the first coding scheme employs a first code rate, the second coding scheme employs a second code rate that is higher than the first code rate. The higher rate makes it possible to incorporate the one or more tail bits into the second portion of the data block. In so doing, generation of additional symbols, such as orthogonal frequency division multiplexing symbols, can be avoided.
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Patent Agency Ranking
公开(公告)号：ES2313802T3
公开(公告)日：2009-03-01
申请号：ES99963390
申请日：1999-12-04
Applicant: ERICSSON TELEFON AB L M
Inventor： SCHRAMM PETER , WACHSMANN UDO
Abstract: Un método para proteger un bloque de bits de información para ser transmitido dentro de un sistema de telecomunicaciones dicho método que comprende los pasos de: anexar un número de bits de cola a dicho bloque de bits de información; codificar el bloque de bits de información, junto con los bits de cola anexos, a una tasa de código dada; aplicar un primer esquema de perforado; aplicar un segundo esquema de perforado; transmitir el bloque codificado resultante de bits de información a través del sistema de telecomunicaciones caracterizado por aplicar un primer esquema de perforado a una primera parte (410; 610) de dicho bloque codificado de bits de información (405; 605); y aplicando un segundo esquema de perforado a una parte restante (415) de dicho bloque codificado de bits de información (405; 605).
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公开(公告)号：AT418823T
公开(公告)日：2009-01-15
申请号：AT01999073
申请日：2001-11-29
Applicant: ERICSSON TELEFON AB L M
Inventor： DAVIDSSON STEFAN , WALTHER ROGER , WENGER FABIAN , PAULI MATHIAS , SCHRAMM PETER , WACHSMANN UDO
Abstract: A radio receiver system ( 30 ) comprises a radio receiver ( 41 ), a receiver sample clock ( 60 ), which is used for sampling a modulated base-band signal; and a timing correction unit ( 100 ). The timing correction unit ( 100 ) performs, in the frequency domain, a timing drift compensation between a transmitter sample clock ( 66 ) and the receiver sample clock ( 60 ). In one example context of implementation, the plural modulated radio frequency carriers have been modulated using Orthogonal Frequency Division Multiplexing (OFDM).
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公开(公告)号：DE60229984D1
公开(公告)日：2009-01-02
申请号：DE60229984
申请日：2002-05-22
Applicant: ERICSSON TELEFON AB L M
Inventor： WENGER FABIAN , DETTMAR UWE , WACHSMANN UDO , SCHRAMM PETER
Abstract: A method and a device for providing timing information within a wireless communication system are described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results. Based on a signal energy within a time window of the received transmit signal incorrect timing information is detected.
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公开(公告)号：DE60219474T2
公开(公告)日：2007-12-13
申请号：DE60219474
申请日：2002-05-22
Applicant: ERICSSON TELEFON AB L M
Inventor： FRANK GEORG , PAULI MATHIAS , WACHSMANN UDO , SCHRAMM PETER
IPC: H04L27/26
Abstract: In order to correct frequency deviations of signals in a multicarrier system, such as a OFDM-system, the present invention provides a frequency tracker and a method to operate the same. The frequency tracker is based on a decision directed digital phase locked loop exhibiting a predictive character. On the basis of an estimated phase offset for a received signal (signal component, signal symbol) a predicted phase offset is calculated and applied to the signal (signal component, signal symbol). Further, received signals (signal components, signal symbols) are sampled and for each sample a sample phase offset to be corrected is calculated in dependence to the related estimated phase offset to incorporate the predictive character. In particular, the predicted sample phase offsets are calculated as a function of a corresponding predicted phase offset and a measure being indicative of a distance, in the time domain, between a corresponding phase reference point for the predicted phase offset and a phase reference point defined for a specific part of the received signal, preferably for a preceding preamble signal.
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公开(公告)号：DE60210090D1
公开(公告)日：2006-05-11
申请号：DE60210090
申请日：2002-07-23
Applicant: ERICSSON TELEFON AB L M
Inventor： PAULI MATHIAS , WACHSMANN UDO
Abstract: A method and a device (60) for estimating channel coefficients in a multi carrier system operating in accordance with a block-code based transmit diversity scheme, in which a data content of a code matrix is multiplexed in a frequency domain are described. The method comprises determining a phase ramp (ϕest) in the frequency domain or an equivalent ( DELTA t) thereof in the time domain, the phase ramp (ϕest) or the equivalent ( DELTA t) thereof being comprised within a receive signal (Y) after timing synchronizatio n, processing the receive signal (Y DELTA t) to remove the phase ramp (ϕest) or the equivalent ( DELTA t) thereof and estimating the channel coefficients on the basis of the processed receive signal.
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