St-ericsson Sa

Skyworks Solutions, Inc.

Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Modems Sa

Laurent Noel

Dominique Brunel

Dominique Michel Yves Brunel

Stefania Sesia

Jean-Marc Aznar

Andrea Ancora

François Sittler

Apparatus and methods for sounding reference signal (SRS) switching are provided. In certain embodiments, transmit path resources of user equipment (UE) are used to reduce or eliminate the impairment of SRS upon transport capacity. Furthermore, the transmit path resources can be used for other purposes, and thus SRS switching time can be reduced by re-using transmit path resources that may be included for other purposes. The teachings herein can be used to achieve SRS switching of 0 &#x3bc;s, thereby eliminating the impact of switching timing constraints for SRS symbols on transport capacity.

Sounding reference signal switching

Apparatus and methods for sounding reference signal (SRS) switching are provided. In certain embodiments, transmit path resources of UE are used to reduce or eliminate the impairment of SRS upon transport capacity. Furthermore, the transmit path resources can be used for other purposes, and thus SRS switching time can be reduced by re-using transmit path resources that may be included for other purposes. The teachings herein can be used to achieve SRS switching of 0 &#x3bc;s, thereby eliminating the impact of switching timing constraints for SRS symbols on transport capacity.

An automatic gain control (AGC) method and system for a radio receiver are proposed in which the ACG comprises two AGC loops; a first loop controlling signal gain in the analogue portion of the radio receiver, a second loop controlling gain in the digital domain after digitization of the received signal. The analogue AGC loop has a slower response time than the digital AGC loop. When applied to a multi-branch diversity receiver, each branch has its own digital AGC loop, but the analogue gain can be common to all branches, based on measurement of the analogue signal in each branch.

Method and device to control the gain of a radio receiver

A method for dynamically clocking one component located into a Wireless telecommunication apparatus comprising a RF transceiver subject to desensizitation by said component EMI, characterized in that it involves the steps of performing an adaptive control on the clock rate of said component so as to locate a wideband noise PSD null just to the left or to the right, in the frequency domain, of the RF transceiver wanted carrier frequency (f) Particularly, the control is performed by means of the control of programmable frequency dividers, and under the control of a general control unit (UCM) for the purpose of performing a contextual analysis of the current mode of operation of said wireless telecommunications and, in response to said contextual analysis, for determining the fine tuning of the clock rate to be applied to said component.

Process and apparatus for reducing EMI in the RF subsystem of a wireless communication system

A radio transceiver including&#x2014;an antenna () switch having a control lead (); &#x2014;a RF and front end circuit () coupled to said antenna switch and operating in at least one 2G mode and at least one 3G mode; &#x2014;a RF transceiver () coupled to said RF front end and operating in at least a first 2G and a second 3G mode; &#x2014;a baseband () communicating with a set of peripherals and external devices; The radio transceiver is characterized by the fact that it includes: &#x2014;control means () for controlling said antenna switch () in a isolated mode; &#x2014;an programmable adaptive filter controlled by said control means for the purpose of introducing at least one notch for eliminating one corresponding spur. The radio transceiver preferably includes means () for performing, under control of said control means () a FFT computation for the purpose of elaborating a representation, in the time domain, of the different spurs and/or jammers spoiling the received signal when in isolated mode.

Process for achieving spur mitigation in an integrated circuit including a wide band receiver

An automatic gain control (AGC) method and system for a radio receiver are proposed in which the ACG comprises two AGC loops; a first loop controlling signal gain in the analog portion of the radio receiver, a second loop controlling gain in the digital domain after digitization of the received signal. The analog AGC loop has a slower response time than the digital AGC loop. When applied to a multi-branch diversity receiver, each branch has its own digital AGC loop, but the analog gain can be common to all branches, based on measurement of the analog signal in each branch.

A wireless telecommunication apparatus comprising&#x2014;a baseband for the purpose of generating and receiving base-band signals; &#x2014;a RF transceiver for the purpose of transmitting and receiving a RF signals, &#x2014;at least one centralized clock derived from at least one central oscillator; &#x2014;at least one individual element located within said apparatus and having a EMI coupling with said RF transceiver, and which clocking is likely to generate spurs being modulated with the Tx carrier of said RF transceiver; Characterized in that it further includes: &#x2014;a least one controllable clocking system for said at least one individual element; &#x2014;a general control unit (UCM) for the purpose of performing a contextual analysis of the current mode of operation of said wireless telecommunications and, in response to said contextual analysis, for determining a clocking frequency which results in modulated Tx clock spurs out of the receive bands.

Wireless communication apparatus having modulated Tx clock spur control

Process for controlling the switching of the data rate at a digital interface exchanging data and control messages between a Radio Frequency (RF) circuit and a digital circuit, comprising the steps of: setting by default the data rate to a low speed (LS) rate having a density presenting a first lobe being inferior to the frequency band considered in said RF circuit so as to prevent desensitization of the LNAs by the noise produced by said digital interface; storing the data and control messages message into a FIFO and monitoring the level of said FIFO; whenever the level of said FIFO reaches a predetermined threshold value, then controlling said interface to switch to a second high speed (HS) rate in order to flush said FIFO. In one embodiment, the LS frequency is set to a value of 832 MHz, thus preventing simultaneously desensitization of the GSM band and also the GPS band.

Digital interface between a RF and baseband circuit and process for controlling such interface

A communication receiver implements receive space diversity to combine or select signals received from a same source on at least two spatially separated antennas in which the signals may vary in their fading characteristics at a given time. The receiver includes a RF processing module for down-converting and multiplexing the signals and a baseband processing module for converting the signals into digital signals, generating code sequences, producing despreaded and demultiplexed in-phase signals, and retrieving data initially contained within the received signals.

Communication receiver with multiplexing of received signal, for receive space diversity

The present invention relates to a receiver for processing a received signal (SEQ), said receiver being multimode. The invention is characterized in that it comprises; a) a single RF chip for processing the received signal (SEQ) in any mode, said chip comprising a spreading section (SPREAD SEC) for spreading and downconverting to baseband a received signal (SEQ), and a channel filtering section (CH SEC) for DC offsets rejection on a received signal (SEQ), and b) a single baseband chip (BB) comprising despreading means (DSPR) for despreading a spread signal (SEQ).

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Le Cannet, France

Laurent Noel