Abstract: A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.

Abstract: A system and method for processing antenna signals are provided. For example, the method includes, in a receive mode, weighting and combining signals from at least one low-band antenna radiator element operable over a first bandwidth, at least one high-band antenna radiator element operable over a second bandwidth at least partially overlapping the first bandwidth, and, in some examples, at least one antenna radiator element operable over one or more intermediate bandwidths. The method also includes, in a transmit mode, separating and weighting a full-band input port signal into at least one low-band sub-system output port signal, at least one high-band sub-system port output signal, and, in some examples, at least one intermediate sub-system output port signal operable over one or more overlapping intermediate bandwidths. The weighted combination and weighted separation cover an uninterrupted continuous full-band frequency whose extent covers the full frequency range of all subbands.

Abstract: Embodiments of the present disclosure provide a multi-frequency band antenna feeder sharing method and a base station radio frequency unit. The method includes: receiving a signal of a frequency band 1 and a signal of a frequency band 2 through an antenna feeder, transmitting the signals to a band-pass filter and filtering the signals so as to obtain the signal of the frequency band 2, and transmitting the signal of the frequency band 2 to a third radio frequency port through a combiner port; and/or, sending the signal of the frequency band 2 to the combiner port through the third radio frequency port, transmitting the signal of the frequency band 2 that has passed through the band-pass filter to the port of the first radio frequency channel, and sending out the signal of the frequency band 2, together with the signal of the frequency band 1.

Abstract: A system for parallel radio frequency (RF) testing. The system includes a plurality of signal generators, a plurality of signal analyzers, a data bus connected to the plurality of signal generators, and a controller. The controller has a connection to the data bus so as to be in electronic communication with the plurality of signal generators, and has a plurality of point to point links to respective ones of the signal analyzers so as to be in electronic communication with the plurality of signal analyzers.

Abstract: Embodiments of a system and method for transmitting data from an access point in a multiple user multiple input multiple output (MU-MIMO) system are provided. A first indication of signal quality (ISQ) is received at the access point from a first station and a second ISQ is received from a second station. The access point sets a first power level and a first modulation and coding scheme (MCS) for transmission of a first aggregated media access control (MAC) protocol data unit (A-MPDU) to the first station as a function of the first ISQ and an amount of payload data corresponding to the first A-MPDU. The access point also sets a second power level and a second MCS for transmission of a second A-MPDU as a function of the second ISQ and an amount of payload data corresponding to the second A-MPDU.

Abstract: Methods and apparatus are provided for allowing a transmitter (Tx) to perform antenna selection independently of a receiver (Rx) in a transceiver supporting both transmit diversity and receive diversity. Certain aspects may utilize a cross switch, which may be used in a parallel or cross configuration, to provide for the independent antenna selection, such that the Rx may maintain the ability to operate on the same antenna as the Tx, on another antenna, or on both antennas for enhanced receive diversity. Furthermore, certain aspects may employ additional switching in the baseband domain in an effort to avoid, or at least reduce, switching glitches in the Rx caused by changing the cross switch configuration. In this manner, the Rx need not re-converge upon antenna switching.

Abstract: A portable audio/video playback apparatus of the present invention comprises an apparatus main body 1 and a broadcast receiver unit 4 removably attached to the apparatus main body. The apparatus main body 1 includes interfaces 32, 33 for connecting thereto the broadcast receiver unit; an audio processing circuit 22 connected to one interface 32 for processing and feeding an external audio signal to a speaker 24; and a video processing circuit 27 connected to the other interface 33 for processing and feeding an external video signal to a display 13. The broadcast receiver unit 4 includes interfaces 55, 56 connected to the foregoing interfaces 32, 33 and decoders 47, 48 for feeding an audio signal and a video signal included in a received television broadcast signal to the interfaces 55, 56.

Abstract: A method and apparatus for reducing feedback transmission overhead in wireless communications. Averaging, compression, or both are used to reduce a number of bits needed for transmission of channel quality information.

Abstract: Devices, systems, and methods are disclosed which relate to verifying an antenna via a transmitter. A logical interface coupled to a transmitter reads antenna specifications from a memory integrated with an antenna, and refuses transmission when the antenna attributes conflict with the requirements of the transmitter.

Abstract: A communications apparatus. Multiple antennas are arranged to receive downlink signals and transmit uplink signals. A transceiver module is arranged to receive the downlink signals from the antennas and pass the uplink signals to an antenna selection device. The antenna selection device is coupled between the antennas and the transceiver module and arranged to receive the uplink signals to be transmitted from the transceiver module and dynamically pass the uplink signals to one of the antennas according to an antenna selection signal. A processor is arranged to receive the downlink signals from the transceiver module, calculate short-term signal qualities of the downlink signals and generate the antenna selection signal according to the short-term signal qualities.

Abstract: This invention discloses a mobile tower system in which a telescoping tower may be with a plurality of tower structures may be extended to a height much greater than its contracted length. The tower may be transported horizontal, rotated to a vertical position and then the individual tower structures extended and secured via spring pins relative to the adjacent tower structure, the erection of the tower sections may be with external equipment such as a boom truck, or utilizing an internal hydraulic cylinder.

Abstract: A first microwave backhaul transceiver may comprise a plurality of antenna elements. The transceiver may determine atmospheric conditions between it and one or more potential link partners, and adjust a radiation pattern of the plurality of antenna elements based on the determined atmospheric conditions. A first radiation pattern of the plurality of antenna elements may correspond to a first microwave backhaul link between the first microwave transceiver and a second microwave backhaul transceiver. A second radiation pattern of the plurality of antenna elements may correspond to a second microwave backhaul link between the first microwave transceiver and a third microwave backhaul transceiver. The transceiver may adjust the radiation pattern based on characteristics of data to be transmitted, and based on a routing table it maintains.

Abstract: An array antenna apparatus in which an SN ratio is improved. Antenna elements having transmission modules, respectively, are arranged in plurality, wherein the plurality of transmission modules respectively have transmission signal generators that each output a transmission intermediate frequency signal, local oscillation signal generators that each output a local oscillation signal, and transmission mixers that each mix the transmission intermediate frequency signal and the local oscillation signal with each other, thereby to carry out frequency conversion to a transmission high frequency signal. A reference signal source inputs a reference signal to the transmission signal generators and the local oscillation signal generators. The transmission intermediate frequency signal and the local oscillation signal are synchronized with each other by the reference signal.

Abstract: Methods, systems, and computer readable media for detecting antenna port misconfigurations are disclosed. According to one method, the method includes storing one or more reference signal maps for identifying reference signals in downlink data in memory. The method further includes receiving downlink data that appears to be associated with a first antenna port of a device under test (DUT). The method also includes identifying, using the one or more reference signal maps, a first reference signal in the downlink data, wherein the first reference signal appears to be associated with the first antenna port. The method further includes determining, using a first computed error vector magnitude associated with the first reference signal, whether the first antenna port is misconfigured.

Abstract: In accordance with one or more embodiments of the present disclosure a method for selecting transceivers to provide wireless communication service for a wireless user endpoint comprises determining at least one characteristic of at least one communication channel between a wireless user endpoint and a first plurality of transceivers. The determination of the at least one characteristic is based on a reference signal generated by the wireless user endpoint for reception by the first plurality of transceivers. The method further comprises analyzing the at least one characteristic of the at least one communication channel. The method additionally comprises selecting at least one transceiver of the first plurality of transceivers to provide wireless communication service for the wireless user endpoint. The selection of the at least one transceiver is based on the at least one characteristic of the at least one communication channel.

Abstract: The present invention discloses a method in a wireless access network node for controlling a UE. The UE comprises at least two transmit antennas, and is capable of uplink transmit diversity. There is an antenna weight associated with each transmit antenna. First, the wireless access network node determines that the antenna weights of the user equipment may be controlled. Then, it creates a control signal that comprises control information and transmits it to the user equipment. The control information controls a UE autonomous selection of the antenna weights in the UE.

Abstract: A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.

Abstract: A method for data transmission disclosed is applied to an access point for use in a wireless local area network. The access point has multiple antennas. The method comprises in response to transmitting a first message successfully to a station, determining a maximum transmitting rate at which a message can be transmitted successfully using a current antenna group by increasing the transmitting rate and transmitting a message repeatedly; and, transmitting further messages to the station at the determined maximum transmitting rate.

Abstract: A voltage detector for detecting a voltage generated in a second resonant coil that is disposed to face a first resonant coil and that performs at least one of electric power transmission and electric power reception to and from the first resonant coil in a contactless manner by means of electromagnetic resonance includes: a first high-impedance element having one end connected to one end of the second resonant coil; a second high-impedance element having one end connected to the other end of the second resonant coil; a low-impedance element connected between the other end of the first high-impedance element and the other end of the second high-impedance element and having an impedance smaller than each of those of the first and second high-impedance elements; and an output terminal for outputting a signal associated with a voltage applied across the low-impedance element.

Abstract: According to one embodiment, a method includes establishing a plurality of wired connections between a plurality of nodes. The plurality of nodes include a base station and a plurality of geographically distributed remote transceivers. The base station is assigned to a first set and the base station and a first remote transceiver of the plurality of remote transceivers are assigned to a second set. Each set is configured to wirelessly transmit a respective channel reference signal. Signal quality feedback that indicates the strength of the respective channel reference signals is received from an endpoint. One of the sets is selected to use for transmitting data traffic from the base station to the endpoint based on the signal quality feedback. The method further includes transmitting data traffic from the base station to the endpoint using at least one wireless connection between the endpoint and each node of the selected set.

Abstract: A wireless communication device comprises a first antenna, a second antenna, a switch, and a balun. The first antenna and the second antenna transmit and receive signals. The wireless communication device can use only one antenna (the first antenna) or the two antennas (the first antenna and the second antenna) at the same time according to a comparison between received signal strength indications (RSSIs) of the antennas and a maximum input level of the wireless communication device.

Abstract: A home base station receives signal to interference and noise ratio data from at least one access terminal, determines whether a transmission power of the home base station should be adjusted based on the received signal to interference and noise ratio data, and then adaptively adjusts the transmission power of the home base station based on the received signal to interference and noise ratio data.

Abstract: A digital unit, a signal processing system, and a signal processing method are disclosed. The signal processing system includes a digital unit and a plurality of radio units. The digital unit is connected to a core system and configured to process radio digital signals. The plurality of radio units are physically isolated from the digital unit and configured to convert and amplify digital signals received from the digital unit, to transmit the amplified signals to a terminal based on a multi-antenna technology using two antennas, and to receive the signals from the terminal and to transmit the same to the digital unit based on the multi-antenna technology using two antennas, If a first cell is adjacent to a second cell and if the first cell and the second cell are configured to use the same reference signal, a radio unit of the first cell and a radio unit of the second cell use the same resource element to transmit the same data to a terminal located in a boundary region of the first and second cells.

Abstract: Generally, this disclosure provides systems and methods for modular antenna array beamforming with controllable antenna module delay for improved beam steering accuracy. A system may include a plurality of antenna modules, each of the antenna modules comprising an array of antenna elements coupled to an RF beamforming circuit, the RF beamforming circuit to adjust phase shifts associated with the antenna elements to generate an antenna beam associated with the antenna module; a delay circuit coupled to each of the antenna modules; and a central beamforming module coupled to each of the delay circuits, the central beamforming module to control the antenna beam associated with each of the antenna modules and further to adjust signal delays associated with the delay circuits, wherein the arrays of antenna elements of the antenna modules combine to operate as a composite antenna beamforming array.

Abstract: The present invention relates to a signal-transceiving apparatus for a base station in a distributed antenna system (DAS), comprising: a transmitting module for transmitting a signal; an antenna module which includes a plurality of antennas, and in which a predetermined number of pilot patterns are used in accordance with the size of the coverage area, which is a signal-transmitting range for each of the plurality of antennas, and in accordance with the number of overlapping antenna coverage areas; and a processor which transmits, via the transmitting module, a signal to a terminal using a pilot pattern corresponding to a portion of the plurality of antennas. The same pilot pattern is used for the antennas, the antenna coverage areas of which do not overlap, from among the plurality of antennas.

Abstract: The embodiments relate to a base station and/or radio unit for creating overlaid sectors with carrier aggregation. The radio unit includes a first antenna array including a plurality of first antenna elements. The plurality of first antenna elements are arranged to provide wireless coverage for user equipments on a first frequency carrier in a first coverage area of a cell site. The radio unit also includes a second antenna array including a plurality of second antenna elements. The plurality of second antenna elements are arranged to create at least one sector for providing wireless coverage for the user equipments on a second frequency carrier in a second coverage area within the first coverage area. The radio unit also includes a central unit configured to dynamically adjust one of a location of the second coverage area within the first coverage area and a size of the second coverage area.

Abstract: A wireless station within a Wireless Local Area Network (WLAN) includes a processor, a radio and a directional antenna. The radio gathers participatory data based on communications involving the wireless station and non-participatory data based on communications the wireless station listens to, but does not participate in. The processor produces an operational report based on the participatory data and the non-participatory data and provides the operational report to the WLAN. The processor further alters a gain vector of the directional antenna based on instructions received from the WLAN in response to the operational report.

Abstract: A method for controlling a distributed antenna system includes the following steps. A target propagation delay value is defined according to a transmit/receive transition gap. Propagation delay time of a service antenna unit corresponding to a base station is estimated. The service antenna unit is turned on to perform downlink signal transmission, and the propagation delay time of the service antenna unit is compensated to the target propagation delay value.

Abstract: An apparatus and method for selecting a beam group and a subset of beams in a communication system are disclosed. The method includes: measuring channel state information (CSI) on a downlink from a base station (920); identifying a selected beam group out of a set of beam groups according to a wideband property of the CSI (930); identifying a selected subset of beams in the selected beam group according to at least one subband (940). Wherein the characteristic of the set of beam groups depends on a transmission rank and the number of beams in the selected subset of beams is equal to the transmission rank. The method further includes: generating encoded feedback information identifying the selected beam group and the selected subset of beams for each subband in a double codebook format (950), transmitting the encoded feedback information to the base station.

Abstract: An apparatus and method for reducing the power consumption of a Base Station (BS) in a multi antenna system are provided. The method for reducing the power consumption of the BS includes identifying an amount of resources being in use for communication, determining whether to convert at least one Radio Frequency (RF) unit into a power saving mode considering the amount of resources, if converting at least one RF unit into the power saving mode, turning OFF a power supply of a power amplifier of at least one of at least two antenna paths constituting the at least one RF unit converted into the power saving mode, and increasing a gain of at least one antenna path turning ON a power supply such that a transmission Power Spectral Density (PSD) is not changed according to the power saving mode conversion.

Abstract: An adaptive modulation apparatus and method using a multiple antenna selection scheme are provided. The adaptive modulation method using the multiple antenna scheme includes: selecting one transmit antenna from a plurality of transmit antennas; determining a target transmission rate of the selected transmit antenna to transmit the determined target transmission rate to a multiple antenna reception apparatus; receiving, from the multiple antenna reception apparatus, feedback information including information regarding whether to accept the target transmission rate; and transmitting data to the multiple antenna reception apparatus using the received feedback information.

Abstract: A two-element array antenna system includes a first antenna element and a second antenna element. A transmitting, receiving, and processing (TRP) system is coupled to the first and second antenna elements via, respectively, a single first transmission element and a single second transmission element. The first and second transmission elements have respective transmit-path and receive-path functionality. The TRP system is configured to determine an amplitude offset and phase offset associated with the transmit-path functionality of the first and second transmission elements, and, based on data obtained during the determination of amplitude offset and phase offset associated with the transmit-path functionality of the first and second transmission elements, determine an amplitude offset and phase offset associated with the receive-path functionality of the first and second transmission elements.

Abstract: An urban environment having many subscribers in close proximity is interconnected by a line of sight wireless network such that individual subscribers connect to an ISP backbone or hub directly or indirectly through other subscribers in the wireless network. A set of subscribers therefore form a multi-node mesh network of line-of-sight adjacency. In an urban environment, line-of-sight adjacency between buildings is facilitated by window placement of transparent directional antennas. High density, high capacity, networks are formed using the transparent directional antennas where transparency facilitates window mounting and directionality reduces received interference and increases capacity. Each subscriber employs a configuration for communication “upstream” towards the ISP and “downstream” to other subscriber nodes. Each subscriber node includes one or more radios for communication upstream and downstream, a router, and a transparent directional antenna for communication with adjacent nodes.

Abstract: An apparatus and method for reducing the power consumption of a Base Station (BS) in a multi antenna system are provided. The method for reducing the power consumption of the BS includes identifying an amount of resources being in use for communication, determining whether to convert at least one Radio Frequency (RF) unit into a power saving mode considering the amount of resources, if converting at least one RF unit into the power saving mode, turning OFF a power supply of a power amplifier of at least one of at least two antenna paths constituting the at least one RF unit converted into the power saving mode, and increasing a gain of at least one antenna path turning ON a power supply such that a transmission Power Spectral Density (PSD) is not changed according to the power saving mode conversion.

Abstract: The present invention relates to a method for configuring, for each of one or more ranks in the DAS (distributed antenna system), a codebook for a DAS, including pre-coding matrices for the DAS, wherein the matrices include information on at least one or more antennas used for communication with a specific terminal, from among the whole antenna of the base station which belongs to the DAS, and information on the ratio of electric power allocated to each of the antennas of the base station. The present invention also relates to a method for transmitting a signal which is pre-coded using the thus-configured pre-coding matrices for the DAS.

Abstract: A method for calibrating a channel which includes: performing slide-window correlation on a delayed downlink service signal of a current transmit channel and a feedback signal of the transmit channel, and performing sampling to obtain a group of correlation values of the transmit channel in a sliding window; determining a peak amplitude value among amplitude values of the group of correlation values in the sliding window, and amplitude values at two points that are left adjacent and right adjacent to a point corresponding to the peak amplitude value; performing an interpolation operation on the peak amplitude value and the amplitude values at the two points that are left adjacent and right adjacent to the point to obtain an amplitude value, a delay and a phase at an actual peak point in the group of correlation values of the transmit channel in the sliding window; and calibrating the transmit channel.

Abstract: A carrier aggregation radio system is provided. The carrier aggregation radio system includes a transceiver having a main receiver, a diversity receiver and a carrier aggregation receiver. The carrier aggregation radio system further includes a control system adapted to command a radio front end to route diversity signals from a diversity antenna to the main and diversity receivers in a first mode and to command the radio front end to route carrier aggregation signals from the diversity antenna to the carrier aggregation receiver in a second mode. The control system may also command a third mode in which diversity signals are routed to the main and diversity receivers while carrier aggregation signals are routed to the carrier aggregation receiver.

Abstract: Methods and apparatus are disclosed for discovering spectrum usage of mobile carriers. An example method includes extracting channel information from a plurality of messages transmitted to mobile devices over a wireless communications radio spectrum, identifying a mobile carrier based on the channel information, associating the channel information with a network parameter of the mobile carrier, and determining a channel usage characteristic associated with mobile carrier based on the channel information and the network parameter.

Abstract: A radio base station which includes an antenna and adjusts directivity of a radio wave to be transmitted and received by antenna weight of the antenna, the radio base station includes a receiver which receives a first reference signal from a first mobile terminal and a second reference signal from a second mobile terminal and a processer which produces antenna weight which is based on the first and the second reference signals, to the antenna for sending a common data to the first and the second mobile terminals.

Abstract: By switching between an SFBC and a CDD according to required transmission power in an uplink, the transmission diversity of the uplink is efficiently performed. A wireless transmitter which includes transmitting antennas 21-1, 21-2 and selects any of plural kinds of transmission diversity scheme to perform the transmission diversity includes a transmission power deciding section 14 that decides transmission power based on information notified from a receiver which is a transmission destination, a transmission diversity scheme selecting section 15 that selects any one of the plural kinds of transmission diversity schemes based on the decided transmission power, and a switching section 16, an SFBC coding section 17, a CDD section 18, IFFT sections 19-1, 19-2, CP inserting sections 20-1, 20-2, and the transmitting antennas 21-1, 21-2, which perform wireless transmission to the receiver using the selected transmission diversity scheme.

Abstract: An apparatus may include a channel estimation component to determine a channel estimation matrix H for a tone of a multiplicity of tones in a multiple input multiple output (MIMO) communications signal. The apparatus may further include a processor circuit coupled to the receiver component, and a flow selection component for execution on the processor circuit to calculate a figure of merit for power loss for the received tone based upon the channel estimation matrix, and based upon the calculated figure of merit, perform either a max-log calculation or a maximum likelihood calculation to determine a received signal metric, but not both calculations. Other embodiments are described and claimed.

Abstract: A intelligent backhaul radio have an advanced antenna system for use in PTP or PMP topologies. The antenna system provides a significant diversity benefit. Antenna configurations are disclosed that provide for increased transmitter to receiver isolation, adaptive polarization and MIMO transmission equalization. Adaptive optimization of transmission parameters based upon side information provided in the form of metric feedback from a far end receiver utilizing the antenna system is also disclosed.

Abstract: Embodiments of the invention include electronic communications devices having a memory in near field communication device, a memory arbitrator and a host processor. The near field communication (NFC) devices are configured to receive data and drive power from the communication signal. The memory arbitrator is connected to the NFC device and the memory. The memory arbitrator is also configured to access the memory in response to an access request from the NFC device. Additionally, the memory is configurable to be accessed by both the host processor and the NFC device according to embodiments of the present invention.

Abstract: The present invention proposes a method, device and base station for cooperative beam forming based on MBMS fixed grid of beams GoB. The cooperative beam forming method comprises following steps: grouping users into cell central user group and cell edge user group (S701); performing cell central user group multiplexing based on superposition coding (S702); performing cooperative beam forming operation based on fixed grid of beams GoB for cell edge user group (S703).

Abstract: A first angle of arrival of a first signal from a second communication device to a first communication device is determined. A second angle of arrival of a second signal from a third communication device to the first communication device is determined. First coefficients to control an antenna array according to a first beam pattern is determined using (i) the first angle of arrival of the first signal and (ii) the second angle of arrival of the second signal. The first coefficients are for communicating with the second communication device. Second coefficients to control the antenna array according to a second beam pattern is determined using (i) the first angle of arrival of the first signal and (ii) the second angle of arrival of the second signal. The second coefficients are for communicating with the third communication device.

Abstract: Audio information is recorded in an overwriteable circular buffer of a computing device. Construction of a search query is initiated by receiving a user input. The user input includes one or more keywords forming a user-defined portion of the search query. At least a portion of the audio information recorded in the overwriteable circular buffer is processed to obtain one or more additional keywords forming an expanded portion of the search query. The portion of the audio information containing the additional keywords is received and recorded in the overwriteable circular buffer prior to receiving the user input. The search query including the user-defined portion and the expanded portion is supplied to a search engine. A response to the search query is received from the search engine. The response is generated by the search engine based on the user-defined portion and the expanded portion of the search query.

Abstract: A method for transmitting by a reference signal transmitting apparatus a reference signal in a wireless communication system supporting a beam forming scheme is provided. The method includes transmitting beam pattern measurement window indication information including information related to at least two beam pattern measurement windows which each of reference signal receiving apparatuses will use to the reference signal receiving apparatuses; and transmitting reference signals based on beam patterns which the reference signal transmitting apparatus supports during a preset number of time units.

Abstract: A method of providing an optimal transmission or reception (Tx/Rx) beam in a beamforming system. The method includes receiving a reference signal and selecting an optimal Tx/Rx beam that guarantees an optimal channel environment based on the received reference signal determining a possibility of occurrence of a Tx/Rx beam mismatch between the selected optimal Tx/Rx beam and a Tx/Rx beam used for transmitting information on the selected optimal Tx/Rx beam; and when there is the possibility of the occurrence of the Tx/Rx beam mismatch, performing at least one of widening a beam width of the Tx/Rx beam, increasing a number of Tx/Rx beams, reducing a period of a beam selection operation for selecting the optimal Tx/Rx beam, and reducing a transmission period of the reference signal. Other embodiments including a beamforming system are also disclosed.

Abstract: A first base station receives from a mobile terminal identification information indicating a combination of a weight coefficient for the first base station and a weight coefficient for a second base station, transfers the received identification information to the second base station, and performs precoding of a data signal to be transmitted to the mobile terminal by collaborative transmission, by using the weight coefficient for the first base station identified by means of latest identification information. The second base station receives the identification information from the first base station, and performs precoding of a data signal to be transmitted by collaborative transmission, by using the weight coefficient for the second base station identified by means of identification information obtained as latest identification information and different from that for the weight coefficient for the first base station used for precoding of the data signal.

Abstract: A method for reporting link information in a communication system including a communication terminal and a plurality of transceivers with each of which the communication terminal can communicate over a respective communication link; the method comprising: the communication terminal determining link information for each of the communication links; and the communication terminal periodically transmitting link messages, each link message containing link information for a first set of the communication links, and the link messages being formatted such that groups of successive link messages collectively contain link information for a larger set of the communication links.