公开(公告)号：WO02082844A3

公开(公告)日：2003-02-20

申请号：PCT/EP0203578

申请日：2002-03-28

Applicant: ERICSSON TELEFON AB L M ,  ZIMMERMANN GERD ,  PAULI MATHIAS ,  SCHRAMM PETER ,  KHUN-JUSH JAMSHID ,  GAFVELS LENNART ,  MALMGREN GOERAN

Inventor： ZIMMERMANN GERD ,  PAULI MATHIAS ,  SCHRAMM PETER ,  KHUN-JUSH JAMSHID ,  GAFVELS LENNART ,  MALMGREN GOERAN

IPC: H04J11/00 ,  H04L5/06 ,  H04L12/28 ,  H04L12/56 ,  H04W16/14 ,  H04W72/08 ,  H04Q7/36

CPC classification number: H04W16/14 ,  G01S7/021 ,  H04K3/226 ,  H04K3/822 ,  H04K2203/18 ,  H04L5/06 ,  H04W72/082

Abstract: The invention relates to a method and a device for controlling frequency selection within a wireless communication system in response to radar-like interference signals. The method comprises continuously or quasi-continuously monitoring and assessing a plurality of frequencies with respect to a radar-like interference signal and allocating a quality parameter to each assessed frequency, the quality parameter indicating the probability that the frequency is occupied. The method further comprises selecting one or more frequencies in dependence on the allocated quality parameters and subsequent frequency monitoring.

Abstract translation: 本发明涉及一种用于响应于类似雷达的干扰信号来控制无线通信系统内的频率选择的方法和装置。 该方法包括连续或准连续地监测和评估相对于类似雷达的干扰信号的多个频率，并且将质量参数分配给每个评估的频率，质量参数指示频率被占用的概率。 该方法还包括根据所分配的质量参数和随后的频率监测来选择一个或多个频率。

公开(公告)号：WO9811676A3

公开(公告)日：1998-05-14

申请号：PCT/SE9701494

申请日：1997-09-05

Applicant: ERICSSON TELEFON AB L M

Inventor： SCHRAMM PETER ,  HUBER JOHANNES

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/26

CPC classification number: H04B1/707

Abstract: Methods and apparatus for demodulating a received communication signal employing coherent demodulation and decision-directed channel estimation are disclosed that have a significant gain compared to a receiver employing noncoherent demodulation. This is particularly so for spread spectrum communication systems such as the uplink specified by the TIA/EIA/IS-95 mobile communication standard, in which an orthogonal modulation scheme combined with convolutional coding and interleaving is used. The coherent demodulation methods and apparatus do not require a pilot signal, and thus can be used in communication systems that are originally designed for use of noncoherent demodulation.

公开(公告)号：ES2383665T3

公开(公告)日：2012-06-25

申请号：ES98941974

申请日：1998-08-25

Applicant: ERICSSON TELEFON AB L M ,  ERICSSON TELEFON AB L M

Inventor： SCHRAMM PETER ,  OLOFSSON HAAKAN GUNNAR ,  ANDREASSON HENRIK ANDERS

IPC: H04L1/00 ,  H04L1/18

Abstract: Un método para retransmitir un bloque de información (40) que fue reconocido negativamente y que fue transmitido previamente utilizando un primer tipo de modulación y un primer tipo de codificación de FEC que 5 comprende las etapas de: (a) seleccionar al menos uno de un segundo tipo de modulación diferente del citado primer tipo de modulación y un segundo tipo de codificación de FEC diferente del citado primer tipo de codificación, para crear un esquema de procesamiento de retransmisión; (b) procesar el citado bloque de acuerdo con el citado esquema de procesamiento de retransmisión; y (c) retransmitir el citado bloque procesado pero continuando con la transmisión de otros bloques utilizando el citado primer tipo de modulación y el primer tipo de codificación de FEC.

公开(公告)号：CA2300852C

公开(公告)日：2009-11-03

申请号：CA2300852

申请日：1998-08-28

Applicant: ERICSSON TELEFON AB L M

Inventor： SCHRAMM PETER ,  MULLER FRANK ,  HOOK MIKAEL ,  FRODIGH MAGNUS CARL ,  SKOLD JOHAN

IPC: H04L27/18 ,  H04L27/34 ,  H04J3/00 ,  H04L1/00 ,  H04Q7/38 ,  H04W4/20

Abstract: A method of demodulating voice or data and control information in systems that support multiple modulation schemes modulates voice or data using a first linear modulation scheme, such as 16QAM modulation scheme, and modulates control information using a second linear modulation scheme, for example, QPSK modulation scheme, that has the same symbol rate as that of the first modulation scheme. The first linear modulation scheme has a higher modulation level than the second linear modulation scheme. Information modulated using the second linear modulation scheme, which uses a reduced signal set of the first linear modulation scheme, are demodulated using the same demodulator that is used for demodulating information modulated using the first linear modulation scheme. Also, in-band signalling information within a traffic channel, such as stealing flags, are modulated using the second modulation scheme.

公开(公告)号：ES2313153T3

公开(公告)日：2009-03-01

申请号：ES05012900

申请日：2002-05-22

Applicant: ERICSSON TELEFON AB L M

Inventor： WENGER FABIAN ,  DETTMAR UWE ,  WACHSMANN UDO ,  SCHRAMM PETER

IPC: H04J11/00 ,  H04L7/04 ,  H04B7/26 ,  H04L7/00 ,  H04L12/28 ,  H04L27/26

Abstract: Un método en un sistema de comunicaciones inalámbrico para proporcionar información de temporización para una señal de transmisión recibida, que comprende - correlacionar una o más partes de la señal de transmisión recibida con una señal de instrucción cuantificada para obtener uno o más resultados de correlación; y - determinar la información de temporización en base a los resultados de correlación; - detectar falsa alarma en base a la energía de una señal contenida dentro de una ventana de tiempo de la señal de transmisión recibida; - obtener uno o más resultados de correlación en forma de respuestas de impulsos estimadas de canal ([.]), caracterizado porque la energía de señal de respuesta de impulsos de canal contenida en la respectiva ventana de tiempo de la señal de transmisión recibida está determinada por cada instante de temporización posible, el paso de determinar la información de temporización en base a los resultados de la correlación comprende determinar la ventana de tiempo que contiene la energía máxima de señal (E_win,max), y la detección de falsa alarma se basa en la energía máxima de señal.

公开(公告)号：CA2301945C

公开(公告)日：2008-12-23

申请号：CA2301945

申请日：1998-08-25

Applicant: ERICSSON TELEFON AB L M

Inventor： OLOFSSON HAKAN ,  SCHRAMM PETER ,  ANDREASSON HENRIK

IPC: H04L1/18 ,  H04L1/00 ,  H04L1/12

Abstract: A communication system supports multiple modulation/coding schemes. When connection quality drops below an acceptable threshold, ARQ techniques use an alternative modulation/coding scheme which is more resistant to noise and/or interference. Flexible resegmentation and mapping of information blocks is supported.

公开(公告)号：AT415023T

公开(公告)日：2008-12-15

申请号：AT05012900

申请日：2002-05-22

Applicant: ERICSSON TELEFON AB L M

Inventor： WENGER FABIAN ,  DETTMAR UWE ,  WACHSMANN UDO ,  SCHRAMM PETER

IPC: H04J11/00 ,  H04L7/04 ,  H04B7/26 ,  H04L7/00 ,  H04L12/28 ,  H04L27/26

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.

公开(公告)号：DE60223422T2

公开(公告)日：2008-08-21

申请号：DE60223422

申请日：2002-05-22

Applicant: ERICSSON TELEFON AB L M

Inventor： WENGER FABIAN ,  DETTMAR UWE ,  WACHSMANN UDO ,  SCHRAMM PETER

IPC: H04J11/00 ,  H04L7/04 ,  H04B7/26 ,  H04L7/00 ,  H04L12/28 ,  H04L27/26

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.

公开(公告)号：AT377880T

公开(公告)日：2007-11-15

申请号：AT05012901

申请日：2002-05-22

Applicant: ERICSSON TELEFON AB L M

Inventor： WENGER FABIAN ,  DETTMAR UWE ,  WACHSMANN UDO ,  SCHRAMM PETER

IPC: H04J11/00 ,  H04L7/04 ,  H04B7/26 ,  H04L7/00 ,  H04L12/28 ,  H04L27/26

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.

公开(公告)号：AT359649T

公开(公告)日：2007-05-15

申请号：AT02730271

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.