Abstract: Techniques, apparatuses and systems for providing communications based on time reversal of a channel impulse response of a pulse in a transmission channel between a transmitter and a receiver to enhance reception and detection of a pulse at the receiver against various effects that can adversely affect and complicate the reception and detection of the pulse at the receiver.

Abstract: A system and method for Interference Cancellation (IC). One aspect relates to iterative interference cancellation with iterative finger delay adaptation. The interference cancellation method comprises receiving multi-paths of a signal; and performing iterative interference cancellation to remove multi-path interference, wherein the performing iterative IC comprises estimating a Signal-to-Interference-plus-Noise Ratio (SINR) at each of a plurality of pre-determined rake receiver finger delays, and performing successive Channel Estimation (CE) and IC on rake receiver fingers according to their estimated SINRs, and wherein the CE of a next finger does not start until interference of a previous finger is removed from a sample buffer. The method may further comprise improving estimated rake receiver finger delay, and each iteration decreases the amount of interference observed by each finger.

Abstract: To suppress effects produced on other terminals as much as possible, while obtaining the advantage of soft-combining. A multicarrier receiving apparatus that receives a packet comprised of at least a propagation path estimation symbol and a scrambled information symbol to demodulate, and has propagation path estimating sections 3-a and 3-b that respectively estimate propagation paths of radio signals transmitted from a plurality of transmission antennas, scramble multiplying sections 5-a and 5-b that respectively perform the same scrambling on propagation path estimation values output from the propagation path estimating sections 3-a and 3-b as scrambling provided in the information symbol on the transmission antennas sides, an adding section 3-c that adds scrambled propagation path estimation values, and a propagation path compensating section 7 that performs propagation path compensation of the information symbol included in the received packet using a signal output from the adding section 3-c.

Abstract: Technologies are generally described for tracking an object. In some examples, a system may comprise a mobile phone and an augmented reality device. The mobile phone may be effective to receive a transmitted wave and to receive a reflected wave reflected off of an object. The mobile phone may be configured to determine a difference between the transmitted and the reflected wave, and generate first tracking data based on the determined difference. The augmented reality device may be adapted to receive the first tracking data and determine second tracking data regarding the location of the object based on the first tracking data. An image may be generated on a display based on the determined first and second tracking data.

Abstract: A MIMO transmitter and method for transmitting a group of sequential OFDM symbols on a downlink channel using a plurality of antennas is disclosed herein. Groups of OFDM subcarriers are individually modulated in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers, corresponding symbol-modulated subcarriers are combined for transmission on each of a plurality of spatial channels, and beamforming is performed on the combined symbol-modulated subcarriers for transmission over the spatial channels. The channel comprises a plurality of the groups of the OFDM subcarriers and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments. The spatial-frequency subcarrier modulation assignments for each group are determined based on feedback by a receiver, which is determined from spatial channel characteristics of the spatial channels.

Abstract: A telematics system in an asset network is provided. The telematics system includes one or more sensors configured to acquire data from multiple assets at different locations in the asset network. The telematics system also includes a transceiver configured to receive the data acquired from the one or more sensors. The telematics system further includes a data analysis system. The data analysis system includes a central data server configured to receive the data transmitted from the transceiver. The data analysis system also includes a processing circuitry configured to combine data, analyze combined data to detect trends, generate value added services based on the detected trends and distribute the value added services to multiple end users.

Abstract: The present invention increases the interference diversity in systems with the frame structure described above by using frequency hopping sequences that are selected considering characteristics of the channel relating to how the channel varies. According to a first embodiment, the channel characteristics relate to channel coherence time and according to a second embodiment, the channel characteristics relate to channel coherence bandwidth. For channels with long coherence times, the transmission hops back and forth several times during a TTI on the different available frequencies. For channels with wide coherence bandwidths, hopping may be performed between the frequency used by the reference signals and its neighbor frequencies. For channels with both long coherence times and wide coherence bandwidths, a combination may be used.

Abstract: A wireless communication apparatus having a plurality of antennas 11-1 to 11-M and for diversity-combining signals received by the antennas 11-1 to 11-M, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm, which is different from the first algorithm; a determination unit 15 for determining whether there is a delayed wave based on the received signals; and a control unit 16 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on a determination result by the determination unit 15 and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M.

Abstract: A portable terminal is provided, which includes a communication unit that transmits/receives a signal modulated by a predetermined modulation method to/from three or more base stations; a storage unit which stores in advance a plurality of propagation models indicating propagation environments of the signal for respective combinations of the base stations and stores in advance position information of the base stations; and a control unit that controls the communication unit and the storage unit; wherein the control unit specifies a propagation model that corresponds to a combination of the base stations among the plurality of propagation models stored in the storage unit based on the signal and calculates communicable distances of the signal based on the corresponding propagation model, calculates circles having the corresponding communicable distances as their radii and having positions of the base stations as their centers, respectively, obtains an overlapping area where the circles overlap one another, and

Abstract: A data transmission method in a multiple antenna system is provided. The method includes: defining a codebook including at least one precoding matrix composed of a plurality of rows and columns, wherein the codebook is at least one of a first type in which all elements of the precoding matrix are non-zero elements, a second type in which any one column of the precoding matrix includes non-zero element and the remaining columns include at least one zero element, and a third type in which all columns of the precoding matrix include at least one zero element; precoding an input symbol by using the defined codebook; and transmitting the precoded symbol.

Abstract: A method and mobile communication station for communicating orthogonal frequency division multiplexed (OFDM) symbols uses two or more antennas. The antenna parameters are set for beamforming, a transmit power level is initially set, and subcarrier modulation assignments are selected after the antenna parameters and the transmit power level are set to achieve a quality-of-service level for a particular application and data type of a service flow. The transmit power level may also be set based on a desired cell size.

Abstract: A system and method of transmit diversity for wireless communication. The system includes a transmitting terminal having a plurality of transmission antennas and a receiving terminal having a plurality of receiving antennas. The method includes analyzing channel state information obtained by the transmitting terminal; selecting an antenna to be one in use from the receiving antennas; matching the selected antenna in use with the wireless signals that are to be transmitted; transmitting wireless signals that are matched to the receiving terminal for being calculated and determining the pre-selected antenna in use, thereby significantly reducing complexities of the receiving terminal.

Abstract: The claimed subject matter relates to enforcing a threshold peak to average power while reducing affects associated with saturation. This can be accomplished, for instance, by assessing piecewise linear approximation of an ideal saturation region, wherein the ideal saturation region is based at least in part upon the threshold peak to average ratio. Thereafter, a desirably transmitted signal can be saturated if power associated with the signal lies outside a region encompassed by the piecewise linear approximation.

Abstract: A method, apparatus and computer program product for predicting received signal strength in a wireless mobile receiver. The invention bounds the range of allowed values for a next predicted signal. The bounded prediction compensates for erroneous values from multipath fading. The predicted signal strength is used to set the mobile receiver amplifier gain to the desired level.

Abstract: A system for transmitting a signal via diversity antennas includes at least one delay element for generating at least one delayed replica of the signal subject to a given delay, the signal and the at least one delayed replica being adapted to be transmitted via the diversity antennas, and a control unit for the at least one delay element for varying the given delay, whereby the signal and the at least one delayed replica, transmitted via the diversity antennas, give rise to alternate constructive and destructive combinations therebetween.

Abstract: Methods and apparatus are provided for use in devices operatively enabled to perform waveform correlation result processing.

Abstract: A digital broadcast reception device mounted on a mobile body includes a position information detection unit for detecting the position of the digital broadcast reception device, a database holding unit for storing reception quality of the digital broadcast in advance, a switching point calculation unit for obtaining a hierarchy switching point, and output switching unit for performing a hierarchy switching. The digital broadcast reception device acquires the hierarchy switching frequency generated during movement in advance based on reception quality information previously stored in the database holding unit, and controls the hierarchy switching so as to reduce the switching frequency, thereby reducing disconnections of video and audio.

Abstract: The present invention provides a plurality of embodiments for beamforming in an asymmetrical system wireless communication system (400) of NT (102i) transmit antennae and NR (104j) receive antennae where NT>NR that ensure the transmit power on each antenna is the same, without appreciable loss in performance. Additionally, a technique is provided for choosing fewer beamforming vectors than frequency bins in an OFDM system.

Abstract: Object To reduce deterioration of transmission quality under circumstances where the moving speed is high. Overcoming Means An adaptive modulation control apparatus for adaptively selecting a modulation parameter from among a plurality of modulation parameters determined based on a plurality of modulation schemes, coding rates of error correction or a combination thereof corresponding to a propagation path state is provided with a reception state measuring section (2) that measures a reception state of a signal received from a communicating apparatus, a correcting section (3) that makes a correction to change propagation path information indicative of a measurement result of the propagation path state based on the measured reception state, and a modulation parameter selecting section (4) that selects a modulation parameter corresponding to the corrected propagation path information.

Abstract: A radio communication apparatus for performing radio communication with a terminal apparatus, including: a calculation unit which calculates first and second propagation distances indicating path lengths of first and second paths respectively; a decision unit which determines whether the first and second received waves are reflected waves or direct waves, respectively, based on the first and second propagation distances, and outputs a first or second terminal-reflection point distance on determining the first or second received wave as the reflected wave, or outputs the first or second propagation distance on determining the first or second received wave as the direct wave; and a position measurement unit which measures the position of the terminal apparatus based on the first or second terminal-reflection point distance, or the first or second propagation distance.

Abstract: An improvement in a method of transmit beamforming between a transmitter (16) and a receiver (18) for a time varying lading channel comprises the step of performing transmit beamforming using less than complete knowledge of the previous fading blocks to design a codebook (26a) of a current fading block with each time frame. One embodiment comprises a successive beamforming algorithm and a second embodiment comprises a vector quantization beamforming algorithm. A fading parameter ? is determined at least in the transmitter or receiver by monitoring a mobile Doppler frequency.

Abstract: Soft decision sections (503, 506) provisionally decide each modulated signal (502, 505) separated using an inverse matrix calculation of a channel fluctuation matrix at separation section (501). Signal point reduction sections (508, 510, 514, 516) reduce candidate signal points of a multiplexed modulated signal using the provisional decision results (504, 507). Soft decision sections (512, 518) make a correct decision using the reduced candidate signal points and obtain received data (RA, RB) of each modulated signal. This allows received data RA, RB with a good error rate characteristic to be obtained with a relatively small number of calculations without reducing data transmission efficiency.

Abstract: For frequency bin error estimation, multiple hypotheses are formed for different frequency bin errors, pilot offsets, or combinations of frequency bin error and pilot offset. For each hypothesis, received symbols are extracted from the proper subbands determined by the hypothesis. In one scheme, the extracted received symbols for each hypothesis are despread with a scrambling sequence to obtain despread symbols for that hypothesis. A metric is derived for each hypothesis based on the despread symbols, e.g., by deriving a channel impulse response estimate based on the despread symbols and then deriving the metric based on the channel impulse response estimate. In another scheme, the extracted received symbols for each hypothesis are correlated, and a metric is derived based on the correlation results. For both schemes, the frequency bin error and/or the pilot offset are determined based on the metrics for all hypotheses evaluated.

Abstract: A radio receiver (FM radio receiver) has an amplitude detecting section (13) for detecting the amplitude level of a received radio wave; a multipath occurrence state detecting section (14) for monitoring the amplitude level, and for detecting the degree of a multipath occurrence state; a multipath occurrence state deciding section (15) for deciding the operation limiting level of the amplitude correction according to the degree of the multipath occurrence state; a receiving condition deciding section (20) for deciding receiving conditions of the radio wave; and a limiting level deciding section (21) for adjusting the operation limiting level of the amplitude correction output from the multipath occurrence state deciding section (15) according to a receiving condition decision result output from the receiving condition deciding section (20), and suppresses the multipath noise by imposing operation limitations on the amplitude correction of the FM demodulator 9.

Abstract: In an RF communication system, aspects for diversity processing may comprise processing a plurality of received multipath signals as clusters of signals. The received multipath signals may be diversity signals received from diversity transmit antennas at a base station. Timing information may be generated for tracking the clusters of signals. Complex phase and amplitude information may also be estimated for at least some of the multipath signals in the clusters of signals. At least a portion of the received multipath signals may be combined to form a single path processed diversity signal. A plurality of the single path processed diversity signals may be combined together, where each of the single path processed diversity signals may be derived from one of the plurality of diversity transmit antennas at the base station. The diversity signals may be transmitted via at least one of a plurality of diversity modes.

Abstract: Finding a channel impulse response estimation window in a current cell for at least one mobile terminal in a neighboring cell is disclosed. This can serve to mitigate interference caused by mobile terminals in neighboring cells in and among communications ongoing in a current cell. In one example, a method for A method for determining such a channel impulse response estimation window includes presetting, in the neighboring cell, at least two channel impulse response peak locations of respective mobile terminals in first and second predetermined periods with a predetermined peak location change pattern, and then upon receiving communication from a mobile terminal of the neighboring cell, analyzing channel impulse responses to identify the peak location change pattern with regard to first and second peak locations.

Abstract: It is an object of the present invention to hold the detecting range of a timing correlator in a base station to the minimum required and to reduce the circuit scale and power requirement of the timing correlator. Before a mobile station transmits a data signal, it transmits a signal referred to as a preamble signal to measure the transmission timing to the base station. If the base station detects the preamble signal with a timing correlator having a limited circuit scale, then the base station transmits a transmission permission signal to the mobile station. If the mobile station fails to receive the transmission permission signal over a given period of time after it has transmitted the preamble signal, then the mobile station retransmits the preamble signal at a changed transmission timing based on the received electric power of a control signal transmitted continuously from the base station and information included in the control signal.

Abstract: A communication system providing wireless communication among wireless users through a number of cellular base stations, each including at least transport management equipment and broadband equipment, at least one of which supports at least remote cellular station including RF equipment for communication with users of cellular devices. The system includes at lease one wireless narrow beam communication link operating at millimeter wave frequencies in excess of 60 GHz connecting a remote cellular station with a cellular base station equipped with broad band conversion electronic equipment and transport management equipment. In preferred embodiment the communication system includes a large number of remote cellular stations with each remote cellular station serving a separate communication cell.

Abstract: A lens-based millimeter wave transceiver for use in wireless communication systems operating in the E-band spectrum consistent with the FCC rules regulating the 71-76 GHz and 81-86 GHz bands. The transceiver includes a single lens adapted for transmission of millimeter radiation to form communication beams in one band of either a band of about 71-76 GHz or a band of 81-86 GHz and for collection and focusing of millimeter wave radiation from communication beams in the other of the two bands. It includes a feed horn adapted to broadcast millimeter radiation through said single lens and to collect incoming millimeter wave radiation collected and focused by said single lens. A millimeter wave diplexer separates incoming and outgoing millimeter wave radiation.

Abstract: Identifying a trigger point of at least one OFDM decoder includes correlating a first time-domain sample of the at least one OFDM symbol with a second time-domain sample of the at least one OFDM symbol, processing the first time-domain sample and the second time-domain sample in the first moving average filter to determine a channel impulse response, comparing at least one correlation value of a first biggest path in the channel impulse response and a second biggest path in the channel impulse response, and determining a channel length of the channel impulse response based on a time duration of the channel impulse response. The OFDM decoder includes a first moving average filter and a second moving average filter.

Abstract: A signal processing circuit includes a demodulator to demodulate a received signal and output a demodulated signal, a filter to output a signal corresponding to a prescribed frequency component of the demodulated signal, a blending unit to blend the demodulated signal with an output signal of the filter at a prescribed blending ratio, an electric field strength change amount detection unit to detect a change in electric field strength and output an electric field strength change amount, and a blending ratio determination unit to determine the prescribed blending ratio according to the electric field strength change amount.

Abstract: An orthogonal-frequency division multiplexed (OFDM) transmitter is configured to transmit a data unit in accordance with a multiple-input multiple-output (MIMO) technique over a wideband channel comprising a 20 MHz channel and another channel using a plurality of spatially diverse antennas. The transmitter is further configured to include in the data unit, a parameter indicating a modulation and coding scheme and a parameter indicating number of spatial streams. Each of the spatial streams is encoded and beamformed for receipt by one or more different receiving stations.

Abstract: Method for locating a cell phone or PDA, e.g., arranged in or on a movable asset, includes obtaining information at the cell phone or PDA relating to reception of signals, transmitting the information from the cell phone or PDA to a remote facility and determining the location of the cell phone or PDA from the information at the remote facility. The cell phone or PDA may obtain DGPS signals and transmit them to the remote facility. In this manner, the location of the cell phone and the asset in or on which it is arranged, or the person carrying the cell phone can be determined at the remote location.

Abstract: A communication condition between the transmitting apparatus and the mobile receiving apparatus at a future position of the mobile receiving apparatus is estimated on the basis of the position information and the information materials of communication environments. A transmission rate which is related to the transmission of the content data from the transmitting apparatus to the mobile receiving apparatus, is changed on the basis of the estimation result. Alternatively, the transmission of the content data from the transmitting apparatus to the mobile receiving apparatus is temporarily stopped, on the basis of the estimation result.

Abstract: A wireless communication system supporting improved performance in a sparse multi-path environment is provided that uses spatially reconfigurable arrays. The system includes a first device and a second device. The first device includes a plurality of antennas and a processor operably coupled to the plurality of antennas. The plurality of antennas are adapted to transmit a first signal toward a the second device and to receive a second signal from the second device. The processor is configured to determine an antenna spacing between the plurality of antennas based on an estimated number of spatial degrees of freedom and an estimated operating signal-to-noise ratio. The second device includes a receiver adapted to receive the first signal from the first device, a transmitter adapted to transmit the second signal toward the first device, and a processor. The processor estimates the number of spatial degrees of freedom and the operating signal-to-noise ratio from the received first signal.

Abstract: In order to improve upon a degradation in performances due to inter-carrier interference without loss of transmission efficiency, antennas provided on a mobile body are made directional antennas. An antenna selection unit selects a directional antenna in such a manner that Doppler shift that is caused by movement of the mobile body will keep a constant sign that is positive or negative, a fading-variation calculation unit calculates the average value of fading variation on each path of a multipath environment, and a fading-variation compensation unit compensates the multipath fading variation based upon the average value.

Abstract: Method and apparatus for providing link quality feedback to a transmitter. In one embodiment, a periodic link quality message is transmitted on a gated channel, while continuous differential indicators are transmitted. Between quality messages, the differential indicators track the quality of the link. In one embodiment, a parity check is provided with the quality message. In another embodiment, the frequency of transmission for the quality messages is determined by the channel quality. When the receiver anticipates reception of a transmission, the quality messages are generated; else the quality messages are halted.

Abstract: For transmitting transmission data generated by a transmission data generator of a communication terminal device, a packet unit determining unit [17] determines a packet unit for a lowest data communication rate for the transmission of the transmission data, among packet units (packet sizes) that can be recognized by a destination communication terminal device and that can be transmitted from the communication terminal device. A packet generator [18] packetizes the transmission data according to the packet unit determined by the packet unit determining unit [17], and transmits the packetized transmission data to the destination communication terminal device.

Abstract: Provided are an automatic network configuration apparatus and method between short-range wireless terminals. The apparatus includes a storing unit for storing a threshold range value for determining adjacency with an adjacent wireless terminal, a wireless environment compensation constant in a present wireless environment, and a network configuration parameter for automatic network configuration; a signal strength measuring unit for periodically measuring strength of the wireless signal transmitted from the adjacent wireless terminal; a range calculating unit for calculating a range from another wireless terminal corresponding to the strength of the wireless signal measured in the signal strength measuring unit based on the wireless environment compensation constant in the pre-stored present wireless environment; and a network configuring unit for performing network configuration with the adjacent wireless terminal when the calculated range is within a threshold for determining adjacency.

Abstract: A wireless base station having K antennas communicates with M mobile devices using multiuser diversity scheme with opportunistic interference management. The base station transmits K distinct pilot signals from K corresponding antennas and receives feedback from mobile devices. The feedback from each device indicates a strong pilot signal and a weak pilot signal received from the K distinct pilot signals. Using these indications, the base station assigns each of the K antennas to a mobile device. The base station then transmits distinct data streams to the mobile devices using the corresponding antennas assigned to the corresponding mobile devices. The transmission may include multiplying the transmitted distinct data streams by a vector V orthogonal to a vector U, thereby allowing mobile devices not assigned to an antenna to cancel the transmitted distinct data streams.

Abstract: The present invention relates to methods and arrangements for assisting a User Equipment (UE) to determine transmit power to be used on a first uplink component carrier y, wherein the base station is configured to communicate with the UE over a plurality of uplink and downlink component carriers x,y. The UE is aware of path loss parameters associated with a second downlink component carrier x. The method in a base station comprises determining cell specific path loss parameters associated with the component carriers of the base station. The cell specific path loss parameters at least comprises path loss parameters associated with the first uplink component carrier y and a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band.

Abstract: According to one embodiment of the invention, a system and a method for maintaining a first history of strength of a first transmission path between a first wireless node and a second wireless node in a multiple input multiple output (MIMO) communication system, maintaining a second history of strength of a second transmission path between a third wireless node and the second wireless node in the MIMO communication system, performing a spatiotemporal correlation between the first history and the second history to determine if any changes in the strength of the first transmission path is observed, and predicting future changes to strength of the second transmission path between the third wireless node and the second wireless node based on the performed special correlation between the first history and the second history.

Abstract: A communication device carries out communication using N number of communication channels, where N is an integer not less than 2. The communication device includes interleavers that shuffle a data series, which is meant to be transmitted over the N number of communication channels, in at least two directions from among a time direction, a space direction, and a frequency direction, and deinterleavers that shuffle the data series back to obtain the original data series.

Abstract: An array receiver which reduces complexity and cost by exploiting multiuser information in signals received from a plurality of transmitting users preprocesses (40) samples of antenna signals (x1, x2 . . . , xN) from the antenna elements (22/1, . . . , 22/N) to form basis signals (yO, . . . , yM) together having fewer space-time dimensions than the space-time dimensions of the combined antenna signals. The receiver processes and combines the basis signals to produce sets of estimated received signals (z0, . . . , zM), each for a corresponding one of the users. Each of the basis signals comprises a different combination of the antenna signals. The receiver combines the basis signals to provide a user-specific output signal, and periodically updates parameters of the filters (40/0, . . . , 40/M) used for deriving each particular basis signal such that each user-specific output signal will exhibit a desired optimized concentration of energy of that user's received signal as received by the array antenna.

Abstract: A technique for estimating the location of a wireless terminal at an unknown location in a geographic region is disclosed. The technique is based on the recognition that there are traits of electromagnetic signals that are dependent on topography, the receiver, the location of the transmitter, and other factors. For example, if a particular radio station is known to be received strongly at a first location and weakly at a second location, and a given wireless terminal at an unknown location is receiving the radio station weakly, it is more likely that the wireless terminal is at the second location than at the first location.

Abstract: A multiple-input-multiple output (MIMO) transmitter for transmitting a group of sequential orthogonal frequency division multiplexed (OFDM) symbols on a time-division duplexed (TDD) channel in accordance with an IEEE 802.16 standard using a plurality of antennas. The MIMO transmitter comprises a spatial-frequency parser to parse a block of bits into spatial-frequency blocks of a variable number of coded bits, and subcarrier modulators to individually modulate OFDM subcarriers with the spatial-frequency blocks in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers. The TDD channel comprises a plurality of the groups of the OFDM subcarriers, and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments.

Abstract: The present invention concerns a transmission method in a wireless telecommunication system including at least a base station intended to communicate with terminals over bidirectional communication channels, each channel supporting frames being divided into downlink sub frames and uplink sub frames, each downlink sub frame including a number of symbols intended to be transmitted to at least two terminals, wherein the transfer of at least one supplementary symbol between the base station and at least one terminal that can receive or transmit said at least one supplementary symbol is enabled.

Abstract: An apparatus and method for controlling amount of information to be fed back in a multiple antenna system in a multi-user environment. The apparatus includes a channel estimator which estimates channel values by using an input signal; a Singular Value Decomposition (SVD) operator which decomposes singular values from the estimated channel values; and a feedback determining unit which uses the singular values to compute channel capacity that can be obtained according to the amount of channel information to be fed back, and selects the channel information to be fed back by using the channel capacity.

Abstract: A system and method for generating transmit weighting values for signal weighting that may be used in various transmitter and receiver structures is disclosed herein. The weighting values are determined as a function of frequency based upon a state of a communication channel and the transmission mode of the signal. In variations, weighting of the weighted signal that is transmitted through each of a plurality of antennas is carried out with one of a corresponding plurality of transmit antenna spatial weights. In these variations, a search may be conducted over various combinations of transmit weighting values and transmit antenna spatial weights in order to find a weight combination that optimizes a performance measure such as the output signal-to -noise ratio, the output bit error rate or the output packet error rate.

Abstract: Embodiments of the present invention include a method and apparatus for modifying a transmit diversity signal by control of at least a relative parameter, for example, phase difference, in a first signal relative to at least one second signal using various switching modules or techniques. In some embodiments of the invention, the relative difference may be controlled by switching paths, or producing various degrees of relative difference by switching, activating or controlling multiple elements with various resolutions of the relative parameter, or by connecting elements by timing of switches.