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7226results about "Receivers monitoring" patented technology

Radio communication system

There is disclosed a radio communication system in which a constitution of a base station and further a control station can be simplified. A radio communication system according to the present invention converts a received signal received by a plurality of antenna elements in a base station to a signal of different frequency band, and then conflates the converted signal in order to generate sub-carrier wave multiplex signal. The signal is converted to an optical signal, and then the optical signal is transmitted to a control station via an optical fiber. Or the control station performs weighting to phase of the transmitted signal transmitted from a plurality of antennas of a base station, and then performs frequency conversion to different frequency band, and then conflates the converted signal in order to generate the sub-carrier wave multiplex signal. The signal is converted to an optical signal, and then an optical signal is transmitted to the base station side via the optical fiber. The control station and the base station divides the received sub-carrier wave multiplex signal by each frequency band, and then the frequency of the divided signals are converted to the same frequency band in order to generate the transmitted / received signal of each antenna element. By such a constitution, it is possible to reduce constituent of the optical transmission components to the minimum and to simplify the constitution of the base station. Furthermore, it is possible to maintain the relative phase difference and the relative intensity of the transmitted / received signal of each antenna element. Because of this, it is possible to estimate an arrival direction of the received signal and to control radiation beam pattern of the transmitted signal.
Owner:KK TOSHIBA

Calibration apparatus for smart antenna and method thereof

This invention is related to the calibration apparatus and method for compensating the phase characteristics in the receiving and transmitting signal paths of array antenna system, especially adaptive array antenna system operating as the base station system. The objective of this invention is to provide the calibration apparatus and method for the array antenna system to be able to compensate its phase differences or irregularities without any restrictions on the array structure or position of additional antenna or antenna toplogies while the array antenna system is in its operational mode such that the signals used by the subscribers are received or transmitted together with the signals used for the calibration. In this invention the phase delay between the additional antenna element and each of the antenna elements of the array antenna system is measured in advance of the calibration procedure to be used when the phase differences or irregularities are measured during the calibration procedure. The test signals used for the calibration is distinguishable from the signals used by the subscribers. Furthermore, each of the transmitting calibration signals itself is distinguishable from one another when the plural transmitting signal paths are to be calibrated simultaneously.
Owner:SASTECH +1

Uplink resource allocation to control intercell interference in a wireless communication system

Embodiments of the present invention exploit the reciprocity of radio channels in TDD, and longer-term correlation between average uplink and downlink path losses in FDD wireless communication systems to enable distributed schedulers in an enhanced uplink system to allocate uplink transmission resources while preemptively managing intercell interference levels. Each cell's base station transmits a downlink reference signal at a known transmission power level. A mobile station monitors the received signal strength of the downlink reference signals from multiple base stations. The transmitted and received signal strength levels can be used by the mobile station to estimate the amount of intercell interference that the mobile station's uplink transmissions cause, and the mobile station's uplink transmission parameters are adjusted accordingly. In further embodiments, the received reference signal power levels, or values derived therefrom, are transmitted by the mobile station to its serving base station, where a scheduling algorithm uses the information to adjust one or more transmission parameters relating to a grant of uplink transmission resources to the UE, thereby controlling the intercell interference generated by the mobile station's uplink transmissions.
Owner:SONY CORP

MULTI-TRANSCEIVER ARCHITECTURE FOR ADVANCED Tx ANTENNA MONITORING AND CALIBRATION IN MIMO AND SMART ANTENNA COMMUNICATION SYSTEMS

Exemplary embodiments of system and method are provided for measuring signal amplitude, phase and/or delay offsets between multiple transmit signals fed through the transmit signal processing chains and wirelessly transmitted over the transceive antennas of separate transceiver modules, wherein transmit signal coupling between the transmit antennas of said transceiver modules' transmit signal processing chains may be used for synchronizing the transmit signals and calibrating their amplitude, phase and/or delay parameters. The exemplary embodiments further provide a front end arrangement of a wireless transceiver device which can comprise at least two independently controllable transceiver modules, each connected to an associated spatial diversity transceive antenna and comprising at least one associated transmit signal processing chain and at least one associated receive signal processing chain coupled to a common baseband processing unit. The exemplary transceiver architecture can be executed on an antenna loop between the transmit signal processing chain of a first transceiver module and the transmit signal processing chain of a second transceiver over the air interface and relies on an adaptive antenna concept which facilitates a wireless transmission of data via a plurality of wireless communication channels utilizing an array of transceive antennas, receiving feedback information via at least one of said communication channels using such antenna loop and modifying a transmission mode based on the received feedback information.
Owner:RPX CORP

Method and system for quality of service (QoS) monitoring for wireless devices

Method and apparatus to monitor MQoS of wireless mobile devices is described. In one embodiment, the present invention provides a method to monitor the health of 3G mobile devices and provide a status check of such health to network technicians, supervisors, and management. In one aspect, mobile devices on the network perform measurement of MQoS factors that are reported to a quality of service backend. The MQoS data is combined to show current and historical network status. In another aspect, alarms may be set to notify specific managers when manager programmable conditions occur, such as low system performance, or specific error conditions occur. Reports may be generated summarizing and illustrating performance in tabular and graphical form. Parameters used for testing and monitoring mobile devices may be input to specific mobile devices or groups of mobile devices in a system. In one aspect, customer care or call centers may be enabled to request specific tests from specific mobile devices and utilize the overall network status to diagnose and / or resolve customer issues.
Owner:ROOT WIRELESS
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