Abstract: The present invention provides data transmission capacity that is optimized in a communication environment by iteratively modifying a beamforming vector by linearly coupling selfish beamforming with unselfish beamforming using feedback information. The transmitter for modifying the beamforming vector iteratively includes: a feedback receiving module that receives feedback information from a receiver: and a vector determination module that determines an initial beamforming vector by coupling a first vector for the selfish beamforming with a second vector for the unselfish beamforming at the time of initial beamforming, and corrects a coupling ratio of the first vector and the second vector of the beamforming vector with reference to the received feedback information whenever the beamforming is modified.

Abstract: Aspects of a method and system for wireless local area network (WLAN) phase shifter training are presented. Aspect of the system may enable a receiving station, at which is located a plurality of receiving antennas, to estimate the relative phase at which each of the receiving antennas receives signals from a transmitting station. This process may be referred to as phase shifter training. After determining the relative phase for each of the receiving antennas, the receiving station may process received signals by phase shifting the signals received via each of the receiving antennas in accordance with the relative phase shifts determined during the phase shifter training process. Signals received via a selected one of the receiving antennas may be unshifted. The processed signals may be combined to generate a diversity reception signal.

Abstract: A method and apparatus are disclosed for polling for near field communications (NFC) devices by checking for multiple protocols. A NFC device polls for devices by first maintaining an unmodulated carrier field active for a specific period of time. The NFC device then polls using a first modulation and waits for a response. If there is no response, and without again maintaining another unmodulated carrier field for a specific period of time, the NFC device polls using a second modulation that is greater than the first modulation and waits again for a response.

Abstract: The usage capacity of a base station operating in four-branch receive diversity mode is limited to a given number of channel resources, where each channel resource corresponds to an active user. In two-branch receive diversity mode, approximately twice as many channel resources are available, but the receiver sensitivity is less than with four-branch mode. Thus, four-branch mode provides better coverage but with less usage capacity. A base station is operated in four-branch mode to provide the best coverage while usage is low. When the number of users reaches a first threshold, prior to reaching the maximum number of users, the base station transitions to two-branch mode to accommodate an anticipated increase of users above the four-branch capacity, although with reduced coverage. When usage then falls below a second threshold, the base station transitions back to four-branch mode, again providing better coverage.

Abstract: A method for antenna calibration is provided, which includes the following steps: obtaining an updated calibration period T_i after the last time of antenna calibration (S301), calculating a calibration sequence of each antenna channel in the calibration period T_i (S302); according to the calibration sequence of each antenna channel, calibrating each antenna based on the calibration period T_i, and calculating a calibration error parameter (S303); and according to the obtained calibration error parameter, updating the calibration period T_i, and using the updated calibration period T_i for the next time of antenna calibration (S304). The technical solutions provided in the present invention, can monitor difference variety of radio channels in real time by the calibration error parameter, and reflect the calibration precision in real time by the reported calibration error parameter.

Abstract: A method is provided for selecting a precoding matrix to be used in an MIMO communication system. The MIMO communication system includes a transmitter, a receiver and a communication channel. The precoding matrix is used by the transmitter to precode codewords to be transmitted to the receiver over the communication channel. At the receiver, an optimum precoding matrix within a codebook of precoding matrices is determined based on a metric related to the power of received signal layers. An indication is then fed back from the receiver to the transmitter to enable the transmitter to select the optimum precoding matrix from the codebook.

Abstract: In summary, the present invention relates to a device, a method, a system and a computer program enabling to ensure a reliable communication even under difficult radio frequency conditions. In case data cannot be successfully communicated by a radio frequency communication, the data may be transmitted to another device by a body-coupled communication via a human or animal body. The other device can act as a relay and forward the data to an intended destination. Thus, data may be successfully transmitted to the intended destination even under difficult radio frequency conditions due to body shadowing or other effects.

Abstract: The present disclosure relates to a World Band Radio Frequency Power Amplifier and a World Band Radio Frequency Front End Module. The World Band Power Amplifier can contain at least one broadband power amplifier connected to a switch which can direct an RF input signal to a plurality of transmission paths, each transmission path configured for a different frequency. The World Band RFFE Module is more integrated version of the World Band Power Amplifier that can contain broadband RF PA(s), switches, logic controls, filters, duplexers and other active and passive components.

Abstract: A UE apparatus and method for feeding back Channel State Information (CSI) in a wireless communication system are disclosed. The UE apparatus includes a processor for determining a Rank Indicator (RI) for a predefined frequency band and selecting an index of a Precoding Matrix Indicator (PMI) corresponding to the determined RI from a codebook set used for a transmission on the predefined frequency band, and a transmission antenna for transmitting the RI and the index of the PMI to a Base Station (BS). The RI and the index of the PMI are jointly encoded prior to the transmission.

Abstract: A method of channel estimation for a signal having a first portion transmitted using a transmit delay diversity scheme and a second portion transmitted using another multi-antenna transmission scheme includes determining a composite channel estimate from the transmit delay diversity portion of the signal. The method continues with segregating the composite channel estimate into delay groups corresponding to time offsets of the transmit delay diversity scheme for determination of first channel estimates for each subset of transmit antennas. Second channel estimates are determined for each subset of transmit antennas as a function of pilot symbols received in the second portion of the signal and corresponding ones of the first channel estimates. Thus, the first channel estimates are used to improve estimation of the second channel estimates. The method and variations of it may be implemented by configuring one or more processing circuits within a receiver circuit.

Abstract: Aspects of a method and system for beamforming a broadband signal through a multipart network are provided. In this regard, a plurality of signals received via a plurality of antennas may be detected and a plurality of transmit signals may be generated, wherein a phase of at least one of the plurality of transmit signals is responsive to at least one of the detected phases of the received signals. Each of the generated plurality of transmit signals may be separately amplified to generate a plurality of amplified signals. A plurality of the amplified signals may be input to a plurality of first ports is of a multi-port network, wherein at least one second port of the multi-port network may be responsive to signals input to at least two of the plurality of first ports.

Abstract: A method for closed loop transmit diversity that includes receiving data from user equipment (UE) that was transmitted using multiple transmit antennas, selecting a new transmit antenna for the UE, determining a new cycle period for the UE, and sending a new transmit antenna index and a testing indication based on the new cycle period to the UE.

Abstract: The disclosed invention relates to a MIMO (multiple input, multiple output) wideband transceiver. In some cases, the MIMO wideband transceiver comprises a signal processor that outputs or receives a plurality of distinguishable data streams. A first data stream is provided to a first antenna port connected to a plurality of wideband antennas, while a second data stream is provided to a second antenna port connected to a wideband antenna. A spatial filter element configured to assign antenna weights to the plurality of wideband antennas, which cause the wideband antennas to operate in a manner that attenuates wireless signals, at a frequency range at which the wideband transmit wideband radiate, in the direction of the wideband antenna without attenuating the wireless signals in other directions. By attenuating signals extending between the plurality of wideband antennas and the wideband antenna, wideband decoupling between first and second antenna ports is achieved.

Abstract: A methodology and system for performing radio network coverage surveys of multiple site candidates concurrently using one reserved channel based on reverse path signal strength measurements of a signal from a test mobile station transmitter (100) to a plurality of prospective base station receiver sites (200, 200?, . . . ) over a geographical area is presented. The instantaneous position, time-stamp and power of the Transmitter (101) is recorded and stored as it moves along a test route(s). Stationary Test Receiver(s) (201) tuned to the selected channel at each prospective site location (200, 200?, . . . ) save received instantaneous signal strength and, it's time-stamp so they can matched up to the position of the Test Transmitter (101) and used to ascertain received signal strength at each site. Results can be useful for ascertaining optimum site locations, antenna configurations, propagation model tuning, frequency planning, pilot planning and extraction of signal correlation statistics.

Abstract: The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.

Abstract: Systems and methods for allocating transmit power among multiple interfaces in a wireless communication system are disclosed. In one embodiment, the method comprises determining a first power level that is used for transmitting over a first air interface, determining a maximum power level available for transmitting over a second interface, comparing the first power level to the maximum power level, determining a second power level that is used for transmitting over the second air interface based on the comparison of the first power level to the maximum power level, and generating a power-based payload constraint based on the second power level.

Abstract: A computing device with a configurable antenna. The antenna is configured through a switching circuit operating under software control. Operating characteristics of the antenna are configured based on connections between conducting segments established by the switching circuit, allowing the nominal frequency, bandwidth or other characteristics of the antenna to be configured. Because the switching is software controlled, the configurable antenna may be integrated with a software defined radio. The radio and antenna can be reconfigured to support communication according to different wireless technologies at different times or to interleave packets according to different wireless technologies to support concurrent sessions using different wireless technologies.

Abstract: A combination of antennas to be used is selected based on a distance between a plurality of antennas or the polarization direction of a radio signal to be transmitted/received.

Abstract: A method is provided for transmitting a digital signal. The method includes generating a plurality of spatial streams from a digital signal and transforming the spatial streams into a plurality of space-time streams. Each of the space-time streams are cycled in the frequency domain among each of a plurality of transmit antennas. The space-time streams are wirelessly transmitted from the plurality of transmit antennas.

Abstract: A base station includes a storage unit to store a codebook, wherein the codebook includes a plurality of matrices; a control unit to perform beamforming using the codebook to generate a signal; and a multi-antenna to transmit the signal. For all of the plurality of matrices, all column vectors of a same matrix of the plurality of matrices are orthogonal to each other. For all columns of the plurality of matrices, all column vectors of a same column of all of the plurality of matrices satisfy a Grassmannian line packing (GLP) criterion.

Abstract: Techniques to support beamforming for stations in a wireless network are described. In one aspect, a station may support beamforming with implicit feedback or explicit feedback by having capabilities to transmit and receive sounding frames, respond to training request by sending a sounding frame, and respond to request for explicit feedback. In one design of explicit beamforming, the station may send a first frame with a request for explicit feedback and may also send a Null Data Packet (NDP) having at least one training field but no data field. The station may receive a second frame with the explicit feedback, which may be derived based on the NDP. The station may derive steering information (e.g., steering matrices) based on the explicit feedback and may then send a steered frame with beamforming based on the steering information. The station may also perform implicit beamforming using NDP for sounding.

Abstract: A method of spatially-encoded wireless transmission using a wireless communications device that is configured with an electromagnetic radiator involves applying a modulated carrier to one or more radiator elements of the electromagnetic radiator. The radiator elements are selected based on instantaneous samples of baseband information, and the modulated carrier is generated from the baseband information. The modulated carrier is then transmitted via the selected radiator elements.

Abstract: An apparatus and method for power control are provided. In a receiver in a mobile communication system, a Receive (Rx) signal received through a plurality of antennas is estimated. A power ratio between a traffic channel of the Rx signal and a pilot channel of the Rx signal is determined. A Log Likelihood Ratio (LLR) value is determined using the power ratio between the traffic channel and the pilot channel, a symbol of the traffic channel, and an Rx signal estimation value to which precoding is applied.

Abstract: An antenna equipment includes an array antenna including a plurality of antenna elements configured to be grouped into at least one group according to each of N communication types, where N is an integer greater than or equal to 2, a selecting part selecting one of the N communication types, a transmitting part modulating outgoing data to generate an outgoing signal for antenna element or antenna elements belonging to each group for the selected communication type, and a receiving part demodulating an incoming signal from antenna element or antenna elements belonging to each group for the selected communication type to generate incoming data.

Abstract: A radio transmission system includes: antenna pairs, each antenna pair being a combination of a transmitting antenna and a receiving antenna in one-to-one correspondence. A radio signal from the transmitting antenna in one of the antenna pairs reaches the receiving antenna of the one antenna pair as a desired wave directly, and a radio signal from the transmitting antenna of another antenna pair different from the one antenna pair reaches the receiving antenna of the one antenna pair as an unnecessary wave directly.

Abstract: A system including an input module, a first gain module, a second gain module, and a preamble estimation module. The input module is configured to receive an input signal from a station. The input signal includes (i) a first preamble sequence, and (ii) subcarriers. The first gain module is configured to, based on the input signal, generate first channel gain values. Each of the first channel gain values is for a respective one of the subcarriers. A second gain module is configured to, based on the first channel gain values, generate second channel gain values. A preamble estimation module is configured to estimate the first preamble sequence based on (i) the first channel gain values, and (ii) the second channel gain values.

Abstract: Techniques for explicit feedback delay measurement are described. An apparatus may comprise a processor to generate a steering matrix for transmit spatial processing over a channel, determine a delay time associated with explicit feedback information for the channel, and determine whether to modify the steering matrix with the explicit feedback information based on the delay time. Other embodiments are described and claimed.

Abstract: A wireless communication method and apparatus using adaptive transmission polarization control are provided. The wireless communication apparatus includes an orthogonal polarization antenna, a channel state estimator, and a transmission polarization state (TPS) selector. The orthogonal polarization antenna receives at least one reference signal. The channel state estimator estimates a wireless polarization channel on the basis of the reference signal. The TPS selector selects a TPS corresponding to the estimated wireless polarization channel from among a plurality of predefined TPSs, and feeds back the selected TPS information. Accordingly, the wireless communication apparatus feeds back information for polarization control using minimum uplink wireless resources, and maximizes a transmission capacity on the basis of the feedback information.

Abstract: A dynamic shared forward link channel (or “data” channel) is used to send multicast data to a group of wireless devices, e.g., using a common long code mask for the data channel. Reference power control (PC) bits are also sent on the data channel and used for signal quality estimation. A shared forward link control channel is used to send user-specific signaling to individual wireless devices, e.g., using time division multiplexing (TDM) and a unique long code mask for each wireless device. A shared forward link indicator channel is used to send reverse link (RL) PC bits to the wireless devices, e.g., using TDM. The data channel is jointly power controlled by all wireless devices receiving the data channel. The control and indicator channels are individually power controlled by each wireless device such that the signaling and RL PC bits sent on these channels for the wireless device are reliably received.

Abstract: A wireless communication system is disclosed. The wireless communication system performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N and M are integers larger than or equal to 2 and N>M).

Abstract: A closed-loop antenna switching method, a reference signal allocating method, and a feedback signal transmitting method for the same are disclosed. Namely, by transmitting a reference signal via the plurality of transmitting antennas via the antenna switching for reference signal transmission for each prescribed multiple period of an antenna selection period, efficient antenna index information can be fed back. By setting an antenna switching period to a prescribed multiple of an antenna selection period, it is able to prevent power loss and data decoding performance degradation. And, the present invention includes transmitting a sounding reference signal (SRS) for each band selection period via at least one of the plurality of transmitting antennas and transmitting at least one data demodulation reference signal (DMRS) between the band selection periods via an antenna for not transmitting data by reference signal transmission antenna switching.

Abstract: A method of operation of a communication system includes: utilizing an estimation module estimating a log-likelihood ratio for a transmission; and utilizing a slicing module, coupled to the estimation module, slicing a constellation by: reading the log-likelihood ratio from the estimation module, defining a threshold within the constellation, and adjusting the threshold based on the log-likelihood ratio for determining a symbol.

Abstract: A wireless device belongs to a wireless communication system and exchanges information within at least one band of frequencies. A method includes detecting a presence of at least one victim device operating within the at least one band of frequencies. The first wireless device is provided with an antenna array, and the detecting step includes analyzing an environment of the wireless device through the antenna array, and if the at least one victim device is detected, reducing interference by controlling the antenna array to steer the antenna beam toward an area located outside a vicinity of the potential victim device to exchanging information within the at least one band of frequencies with at least a second wireless device located in the area.

Abstract: Techniques are described for carrier frequency offset (CFO) and channel estimation of orthogonal frequency division multiplexing (OFDM) transmissions over multiple-input multiple-output (MIMO) frequency-selective fading channels. A wireless transmitter forms blocks of symbols by inserting training symbols within two or more blocks of information-bearing symbols. The transmitter applies a hopping code to each of the blocks of symbols to insert a null subcarrier at a different position within each of the blocks of symbols, and a modulator outputs a wireless signal in accordance with the blocks of symbols. A receiver receives the wireless signal and estimates the CFO, and outputs a stream of estimated symbols based on the estimated CFO.

Abstract: A wireless communication system is disclosed. The wireless communication system performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N and M are integers larger than or equal to 2 and N>M).

Abstract: A method for communication includes performing by one or more processors and/or circuits in a communication device functions including determining transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via the wireless channel. The determining may be based on a transmission mode of the wireless signal and a state of the wireless communication channel. Transmit antenna spatial weights may be determined for communicating the one or more wireless signals via a plurality of antennas. The one or more wireless signals may be weighted with the transmit power weights and/or one of the transmit antenna spatial weights. The weighted one or more wireless signals may be transmitted via one of a plurality of antennas in accordance with the transmission mode.

Abstract: System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems.

Abstract: A “unified” MIMO system that supports multiple operating modes for efficient data transmission is described. Each operating mode is associated with different spatial processing at a transmitting entity. For example, four operating modes may be defined for (1) full-CSI or partial-CSI transmission and (2) with or without steering transmit diversity (STD). An appropriate operating mode may be selected for use based on various factors (e.g., availability of a good channel estimate). With steering transmit diversity, data is spatially spread and transmitted on multiple spatial channels, and a single rate may then be used for all spatial channels used for data transmission. A receiving entity may utilize a minimum mean square error (MMSE) technique for all operating modes. The receiving entity may derive a spatial filter matrix and perform receiver spatial processing in the same manner for all operating modes, albeit with different effective channel response matrices.

Abstract: Systems and methods for decreasing the amount of information sent on a feedback channel are disclosed. Spectral binning and/or a Markov state model may be used to reduce the amount of information sent on the feedback channel.

Abstract: A wireless device includes a baseband unit and front-end units that are provided in individual housings. The baseband unit and the front-end units are connected to each other by wire. A transmitter for synchronization that converts a signal based on a reference clock into a radio signal and transmits the radio signal as a clock synchronization signal is provided in any one of the housings, and receivers for synchronization that receive the signal for the clock synchronization and PLLs that generate a clock synchronized with a reference clock signal which is obtained from the received clock synchronization signal are provided in the housings other than the housing having the transmitter provided therein. In order to simultaneously process a plurality of wireless devices having different symbol rates, it is preferable to provide the transmitter, the receiver, and the PLL for each reference clock.

Abstract: Certain aspects of the present disclosure propose an adaptive joint linear and non-linear digital filter that can adaptively estimate and reconstruct cascaded effects of linear and non-linear self-jamming distortions introduced by non-linearities in the transmit and/or receive chains. The proposed digital filter may be used to cancel second-order inter-modulation distortion (IM2) generated in the receive chain and/or harmonic distortion generated in the transmit chain, as well as other distortions introduced by the transmit/and or receive chains.

Abstract: A wireless communication system is disclosed. The wireless communication system performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N and M are integers larger than or equal to 2 and N>M).

Abstract: A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

Abstract: A MIMO base station is provided that includes a multi-channel transmitter having an input Fourier Transform Matrix (FTM) and an output FTM that are each coupled to an intervening signal processing section having multiple radio frequency (RF) amplifiers. A signal applied to an input port of the input FTM is distributed to all RF amplifiers of the transmitter by the input FTM and then is recombined by the output FTM such that the signal is routed to a single antenna of the multiple antennas of an antenna array. Thus, for both MIMO and non-MIMO transmissions, all RF amplifiers are used to amplify each input signal, but the non-MIMO transmission signal then is recombined such that only a single transmit antenna then is used to transmit the signal. The base station further provides antenna selection for a single antenna transmission and gain allocation among the multiple antennas for a MIMO transmission.

Abstract: A method, an apparatus and a communication unit for generating precoding feedback information in a multiple frequency radio transmission system are disclosed. A rank for precoding matrices, wherein the rank is constant over the multiple frequencies, is selected and a plurality of precoding matrices having the selected rank are selected. A different precoding matrix is selected for each frequency subset of the multiple frequencies.

Abstract: A radio frequency circuit and a signal transmission method are provided. The radio frequency circuit comprises a primary antenna, a secondary antenna and a radio frequency integrated circuit. The primary antenna is electrically coupled to the radio frequency integrated circuit to transmit and receive at least one transmission/reception signal. The secondary antenna is electrically coupled to the radio frequency integrated circuit to receive at least one diversity reception signal. The radio frequency integrated circuit is configured to receive a specific diversity reception signal via the primary antenna and to transmit and receive a specific transmission/reception signal via the secondary antenna.

Abstract: A method and system selects an antenna for signal propagation within a wireless communication device having multiple antennas. A transfer switch controller identifies an operating mode being initiated on the wireless communication device. The transfer switch controller configures a dynamic transfer switch based on the operating mode initiated to support propagation of each available type of communication signal. In addition, the transfer switch controller utilizes a pre-established priority of each available type of communication signal to select the appropriate antenna. The transfer switch controller communicatively connects, utilizing the configured dynamic transfer switch, each of at least one transceiver associated with the operating mode initiated to a specific antenna, where each transceiver supports propagation of a specific type of communication signal.

Abstract: Aspects of a method and system for on-demand signal notching in a receiver. In this regard, power consumption in a wireless device may be managed by configuring one or more transmitters and/or receivers in the wireless device based on a directivity of a received signal and/or signal strength of a received signal. At least a portion of the transmitters and/or receivers may be disabled and/or enabled based on strength of undesired in-band components of the received signal, undesired out-of-band components of the received signal, signal to noise ratio of a desired component of the received signal, a user selected power mode, and/or a direction from said wireless device to a communication partner. A splitter and/or combiner of the wireless device may be configured based on which portion of the transmitters and/or receivers are enabled. A scaling factor and/or a phase shift of the splitter and/or combiner may be configured.

Abstract: A method and apparatus manages resources in a wireless communication system by transmitting a multi-carrier switch command message to an access terminal instructing the access terminal to switch between a diversity mode where each antenna module of a plurality antenna modules receives a single carrier signal transmitted at a single carrier frequency and a multi-carrier mode where a first antenna module of the plurality antenna modules receives a first multi-carrier signal transmitted at a first carrier frequency and a second antenna module receives a second multi-carrier signals transmitted at a second carrier frequency.

Abstract: A method of maximizing a communication parameter, such as data capacity, signal quality or throughput of a channel between a transmit unit with M transmit antennas and a receive unit with N receive antennas and a communication system such as a wireless network (including networks with multiple access techniques such as TDMA, FDMA, CDMA, OFDMA) employing the method. The data is first processed to produce parallel spatial-multiplexed streams SMi, where i=1 . . . k, which are converted or mapped to transmit signals TSp, where p=1 . . . M, assigned for transmission from the M transmit antennas. Corresponding receive signals RSj, where j=1 . . . N, are received by the N receive antennas of the receiver and used to assess a quality parameter, such as a statistical signal parameter including SINR, SNR, power level, level crossing rate, level crossing duration of the signal of a predetermined threshold and reception threshold, or a parameter of the data, such as BER or packet error rate.