公开(公告)号：AU2003282005A1

公开(公告)日：2004-05-04

申请号：AU2003282005

申请日：2003-08-20

Applicant: ERICSSON TELEFON AB L M

Inventor： JONSSON ELIAS

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/06 ,  H04B17/00

Abstract: A method and device (100) for estimating a signal to interference ratio (SIR) of a signal transmitted from a first unit and to a remotely located second unit in a Wideband Code Division Multiple Access (WCDMA) wireless communication system. The transmitted TPC (Transmit Power Control) is checked and upon this result the SIR is determined. The checking of the TPC includes the estimation of the previous and the present power using a weighted contribution of the pilots and the data.

公开(公告)号：AU2003264095A1

公开(公告)日：2004-04-30

申请号：AU2003264095

申请日：2003-08-23

Applicant: ERICSSON TELEFON AB L M

Inventor： JONSSON ELIAS

IPC: H04B1/707

Abstract: A method for adaptively scheduling activation of a path-searcher for a mobile terminal operative in a telecommunication system. The mobile terminal is capable of receiving multi-path signals originating from a scattered signal from a transmitter of at least one base station in the telecommunication system. The time lag between consecutive path-searcher activations is according to the method determined based on a value of the power delay profile discrepancy between two consecutive power delay profiles. The power delay profiles are derived from at least a subset of the powers of signals received at different delays during the path-searcher activation.

公开(公告)号：CA2749081C

公开(公告)日：2017-06-06

申请号：CA2749081

申请日：2010-01-06

Applicant: ERICSSON TELEFON AB L M

Inventor： CAIRNS DOUGLAS A ,  JONSSON ELIAS ,  BERGMAN GOERAN

IPC: H04B1/707

Abstract: A method and apparatus provide for setting processing delay assignments in a CDMA receiver using a flat-channel placement or using a dispersive channel placement, in dependence on characterizing the channel as flat or dispersive. For example, a receiver maintains a logical flag reliably indicating the current channel state as flat or dispersive, and assigns or otherwise sets processing delays e.g., for received signal demodulation using a flat-channel placement algorithm or a dispersive-channel placement algorithm. The "flat-channel" placement algorithm generally provides better performance in flat-channel environments, and the "dispersive-channel" placement algorithm generally provides better performance in dispersive channel environments. Such processing may be regarded as "activating" a simplified processing delay placement grid that offers better performance if the channel truly is flat, with the underlying advantage of providing a reliable mechanism for detecting flat channel conditions.

公开(公告)号：GB2529580A

公开(公告)日：2016-02-24

申请号：GB201519981

申请日：2014-05-15

Applicant: ERICSSON TELEFON AB L M

Inventor： REIAL ANDRES ,  JONSSON ELIAS

IPC: H04B1/707 ,  H04B17/309

Abstract: Techniques for processing a received multi-code code-division multiple-access (CDMA) signal to detect unused spreading codes are disclosed. An example method includes, for each of a plurality of observation time intervals and for each of one or more candidate spreading codes, determining a detection threshold for use in detecting whether the candidate spreading code is unused in the received multi-code CDMA signal, based on a target detection sensitivity and at least one of an estimate of received signal quality and an estimate of channel estimation quality. Estimated signal power for the candidate spreading code is compared to estimated noise and interference power corresponding to a spreading code that is known to be unused or corresponding to a spreading code that carries known symbol values, using the calculated detection threshold. Whether or not the candidate spreading code is unused is then determined, based on the comparison.

公开(公告)号：ZA201105614B

公开(公告)日：2012-09-26

申请号：ZA201105614

申请日：2011-07-29

Applicant: ERICSSON TELEFON AB L M

Inventor： CEDERGREN ANDREAS ,  JONSSON ELIAS

IPC: H04B20060101

Abstract: Methods and apparatus for processing a received multi-stream (MIMO) signal, and in particular for estimating a per-code traffic-channel-to-pilot power ratio for the MIMO signal are disclosed. An exemplary method includes the calculation of an average symbol amplitude or average symbol power level from a plurality of de-spread traffic channel symbols received in a first transmission slot and the estimation of a corresponding pilot symbol amplitude or pilot symbol power level, based on an estimated propagation channel response and at least one of a plurality of precoding vectors used to generate the MIMO signal. A per-code traffic-channel-to-pilot power ratio for the first transmission slot is computed by dividing the average symbol amplitude or average symbol power level by the corresponding pilot symbol amplitude or pilot symbol power level.

公开(公告)号：AT545209T

公开(公告)日：2012-02-15

申请号：AT08860069

申请日：2008-12-01

Applicant: ERICSSON TELEFON AB L M

Inventor： CAIRNS DOUGLAS A ,  JONSSON ELIAS ,  UESAKA KAZUYOSHI ,  WATABE HIROAKI

IPC: H04B1/707

Abstract: A mobile receiver having a multi-mode interference suppression function and a way to estimate its speed utilizes a parametric approach to interference suppression at high speeds, and a nonparametric approach at low speeds. In particular, if the mobile receiver is currently operating in a nonparametric mode and its speed exceeds a first predetermined threshold, the mobile receiver switches to a parametric mode. Conversely, if the mobile receiver is currently in parametric mode and its speed is less than a second predetermined threshold, the mobile receiver switches to nonparametric mode. In one embodiment, the speed may be estimated by a Doppler frequency in the received signal, and the thresholds are Doppler frequencies. In one embodiment, the first and second thresholds are different, creating a hysteresis in the mode switching.

公开(公告)号：ES2364884T3

公开(公告)日：2011-09-16

申请号：ES08758687

申请日：2008-05-21

Applicant: ERICSSON TELEFON AB L M

Inventor： JONSSON ELIAS ,  CEDERGREN ANDREAS

IPC: H04B1/707

Abstract: Un método para el procesamiento de una señal recibida, que comprende: estimar los coeficientes del canal de propagación usando los símbolos recibidos desde un canal piloto; formar una métrica de señal a interferencia para dicho canal piloto usando dichos símbolos; determinar las ponderaciones de combinación como una función de los coeficientes del canal de propagación y la métrica de señal a interferencia, en donde las ponderaciones de combinación son inversamente proporcionales a la raíz cuadrada de la métrica de señal a interferencia y a la potencia de ruido más interferencia; escalar las muestras de la señal recibida usando las ponderaciones de combinación para obtener las muestras ponderadas; y combinar las muestras ponderadas para obtener símbolos programables a partir de un canal deseado para la descodificación, en el que los coeficientes del canal de propagación corresponden a las ramas de un receptor RAKE, y en el que la métrica de señal a interferencia comprende una suma de las relaciones de señal a interferencia para dichas ramas.

公开(公告)号：AT500657T

公开(公告)日：2011-03-15

申请号：AT03757873

申请日：2003-09-19

Applicant: ERICSSON TELEFON AB L M

Inventor： JONSSON ELIAS ,  SENHAJI YOUSSEF ,  TRIANTAFILLIDIS DIMITRIOS

IPC: H04B7/005 ,  H04W52/12 ,  H04W52/20

Abstract: A reference signal to interference ratio (SIR) value for use in requesting changes in a transmitted power level of a received signal of a communications channel is determined based on a current estimated block error rate of the communications channel, a reference block error rate and a measured SIR value of the received signal of the communications channel. Anti-windup procedures for updating the error signal, anti-windup procedures for updating a block error rate used in updating the reference SIR value and emergency procedures are also provided. Mobile terminals and base stations utilizing such procedures are also provided.

公开(公告)号：DE602006018704D1

公开(公告)日：2011-01-20

申请号：DE602006018704

申请日：2006-04-12

Applicant: ERICSSON TELEFON AB L M

Inventor： WANG XIAOHUI ,  JONSSON ELIAS

IPC: H04W52/04

公开(公告)号：DE602005015584D1

公开(公告)日：2009-09-03

申请号：DE602005015584

申请日：2005-09-01

Applicant: ERICSSON TELEFON AB L M

Inventor： JONSSON ELIAS ,  MYREHED MARTEN

IPC: H04B1/707

Abstract: Multipath components of transmitted data symbols are received with individual delays and processed by a RAKE having a number of fingers. A delay profile (31) indicating magnitudes for a first number of delay values is provided. Estimated magnitudes for a second number of delay values located between the first number of delay values are calculated by interpolation, and a combined delay profile (32) is provided by combining the magnitudes for the first and second number of delay values. Delay values for peaks in the combined delay profile are determined, and a number of peak delay values (P 1 , P 2 , P) comprising the largest peak are selected from the combined delay profile. At least some of the selected peak delay values are provided to the RAKE and assigned to the fingers. This allows a reduction of current consumption and dye area, while still providing delay values with sufficient resolution for the RAKE.