Abstract: Aspects of a method and system for a single antenna receiver system for HSDPA are provided. Aspects of a method for processing RF signals, the method may comprise computing channel estimates based on a plurality of received individual distinct path signals, generating timing reference signals indicating a location of at least one of the plurality of received individual distinct path signals, combining at least a portion of the plurality of received individual distinct path signals as a signal cluster based on at least one of the computed channel estimates and said generated timing reference signals, and selecting at least one of combining and equalization processing based on at least one of the computed channel estimates and the generated timing reference signals. Aspects of a system for processing RF signals may comprise circuitry that selects at least one of combining and equalization processing based the computed channel estimates and/or generated timing reference signals.

Abstract: A wireless transmission apparatus that can accurately select an optimal modulation scheme on a per block basis in a multi-carrier communication system in which block division of subcarriers and adaptive modulation are performed. In this wireless transmission apparatus, a propagation path characteristics acquisition section acquires the average SNR and SNR variance for each block, which are estimated by a wireless reception apparatus, using received signals inputted from a reception RF section and outputs these to an assignment section. The assignment section selects a modulation scheme for each block based on the average SNR and SNR variance of each block inputted from the propagation path characteristics acquisition section and modulation sections modulate multi-carrier signals included in each block, with the modulation scheme for each block selected by the assignment section.

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: 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: According to methods and apparatus taught herein, a parametric model of received signal impairment correlations includes a parametric model term that accounts for a dominant receiver but does not result in any significant increase in parametric modeling complexity. In more detail, the parametric model models the dominant interferer as a spatial interferer, which is hypothesized as a point source of interference emanating along single-path channels to each of two or more receiver antennas. The dominant interferer thus is represented in terms of its spatial correlation across receiver antennas. The dominant interferer model term may be included in an overall model fitting process, or it may be fitted separately. Regardless, the spatial modeling approach taught herein may be used for WCDMA and other systems, and may be embodied in essentially any type of linear equalizer receiver structure.

Abstract: The invention provides a Code Division Multiple Access (CDMA) receiver for sampling a received CDMA signal into a plurality of samples. The CDMA receiver comprises a sampling control module, a code generator, and a plurality of despreaders. The sampling control module delays the samples for a plurality of different delay lengths to obtain a plurality of delayed samples respectively corresponding to each of the delay lengths, and adjusts timing of a sampling trigger signal and a code generation trigger signal according to a sampling timing adjustment signal. The code generator generates a despreading code according to the code generation trigger signal. Each of the despreaders is configured for decimating the delayed samples corresponding to each delay lengths according to the sampling trigger signal to obtain a plurality of decimated delayed samples, and despreads the decimated delayed samples with the despreading code to obtain a plurality of output signals.

Abstract: An access point 10 providing a wireless LAN connection to a terminal device, for the purpose of connecting the terminal device to a WAN, the access point 10 includes: antenna units 210 and 310a-d that send and/or receive a radio frequency signal used for exchanging information via the wireless LAN; signal conversion units 220, 230, 240, 320a-d, 330a-d and 340a-d that perform conversion between the radio frequency signal and a digital signal as the information; an information processing unit 110 that executes processing of the digital signal based on a communication protocol for exchanging of the information; antenna cases 200 and 300a-d that contain the antenna units and the signal conversion units; a main unit case 100 that, separated from the antenna cases, contains the information processing unit; and a wired cables 250 and 350a-d that, connecting the antenna cases and the main unit case, performs transmission the digital signal between the signal conversion units and the information processing unit.

Abstract: A multiple-input-multiple output (MIMO) transmitter for transmitting an orthogonal frequency division multiplexed (OFDM) symbol over a plurality of spatial channels using a plurality of antennas is described. The transmitter includes encoding circuitry to encode blocks of input bits in accordance with a variable encoding rate to generate blocks of encoded bits and a spatial-frequency parser to parse the blocks of encoded bits into spatial-frequency groups. The transmitter also includes subcarrier modulators to modulate each spatial-frequency group of encoded bits on one of the OFDM subcarriers to generate symbol-modulated subcarriers. Spatial-frequency groups having a greater number of encoded bits are modulated at higher-order modulation levels and spatial-frequency groups having a lesser number of encoded bits are modulated at lower-order modulation orders.

Abstract: Advantage is taken of adaptive allocation techniques by intentionally creating multi-user diversity in an otherwise flat fading environment in order to improve system capacity. In one embodiment, multi-path distortion can be resolved to determine subscriber station (SS) diversity gain. Overall network capacity can be increased by allocating channel assignments to SSs within the network based on determined SS diversity gains. In one embodiment, intentional multi-path distortion is produced by transmitting a signal and a time-delayed version of the signal from a base station (BS).

Abstract: A method of COFDM demodulation of symbols, each including first carriers conveying data and pilots having their frequency positions varying at least partly from one symbol to the next symbol. The method includes, for each symbol, a step of determining a first estimate of the transfer function of the channel for each carrier in a set of the first carriers of the symbol such that, for the frequency positions of the considered carriers, symbols different from the symbol include pilots, corresponding to a linear combination of second estimates determined for pilots at the frequency of said carrier. The coefficients of the linear combination are determined in iterative fashion, a new coefficient value being equal to the sum of the last value of the coefficient and of a term including the product between an iteration step and an error term, the iteration step being determined in iterative fashion.

Abstract: A system and method for determining a downlink transmit power level for a downlink signaling channel such as the E-DCH HARQ Indicator Channel (E-HICH) in a cellular radio communication network, wherein the transmit power level is calculated to achieve a desired signaling message error rate. The base station determines a diversity order of an uplink control channel from a mobile station, and sets the downlink E-HICH transmit power based on the desired signaling message error rate and the diversity order of the uplink control channel. Optionally, the base station may first determine whether the cell transmitting the E-HICH is the serving cell for the High-Speed Downlink Shared Channel (HS-DSCH). If so, the base station determines the downlink transmit power level for the downlink signaling channel as an offset from the reported Channel Quality Indicator (CQI) value.

Abstract: A communication system providing wireless communication among wireless users through a number of cellular base stations. The system includes a connecting station with a millimeter wave wireless transceiver in communication with a fiber optic or high-speed cable communication network. The transceiver is adapted to communicate at millimeter wave frequencies higher than 60 GHz with another millimeter wave transceiver at one of the cellular base stations. Each of the base stations serves a separate communication cell. Each base station is equipped with a low frequency wireless transceiver for communicating with the wireless users within the cell at a radio frequency lower than 6 GHz. In preferred embodiments the system a part of a telephone system, an Internet system or a computer network.

Abstract: Methods and apparatus to control transmission of a multicarrier wireless communication channel through multiple antennas is generally described.

Abstract: A method for selecting a codeword in a multi-input multi-output (MIMO) communication system is disclosed. The method comprises steps providing a transmitter with codeword. A receiver receives the codeword candidates and calculates the corresponding bit error rate (BER) according to a decoding strategy. The receiver chooses a codeword candidate which has a minimum BER value and sends a selection signal to the transmitter. And, a transmitter determines a codeword for data transmission according to the selection signal.

Abstract: Diversity processing for closed loops may include combining a plurality of received multipath signals to estimate at least one processed diversity signal based on information from at one or more common channels. The common channels may include a dedicated pilot channel transmitted by each diversity antenna. The received multipath signals may originate from diversity transmit antennas at a base station, which may be transmitting information via a closed loop diversity transmission mode. The closed loop diversity transmission mode may be WCDMA/HSDPA closed loop 1 or closed loop 2. Estimations may be made of the closed loop transmit weights used by the base station for transmission of the symbols. Closed loop symbols transmitted by the diversity transmit antennas may then be estimated based on received diversity signals and at least one dedicated pilot channel. At least a portion of the at least one processed diversity signal may be despread.

Abstract: A wireless communication system comprising a transmitting station and a receiving station, and a control method therefore. A mobile station (101) as the transmitting station has a facility for transmitting a preamble signal to a base station (102) as the receiving station before transmission of information data from the mobile station (101) to the base station (102). On the other hand, the base station (102) has a facility for performing path detection by using a signal threshold for the preamble signal received from the mobile station (101), a facility for performing further path detection by using another threshold for the received preamble signal if paths are detected in the path detection, and a facility for setting path information of the paths detected by using the plurality of thresholds for a receiver (206) installed in the base station (102) so as to perform a path diversity reception.

Abstract: In an orthogonal frequency division multiplexed (OFDM) system, a transmitter and/or receiver communicate separate data streams on non-orthogonal spatial channels. Each spatial channel may use the same set of OFDM subcarriers and may take advantage of the multipath characteristics of the spatial channel allowing the communication of additional data without an increase in frequency bandwidth. Space-frequency subcarrier modulation assignments may be dynamically assigned on a per subcarrier basis as well as a per spatial channel basis to help maximize the data-carrying capacity of the channel. In some embodiments, each of the spatial channels may be associated with one of a plurality of spatially diverse antennas. In other embodiments, beamforming may be performed to allow the transmission and/or reception of signals within the spatial channels.

Abstract: Optimal allocation of a number of sub carriers to applications having diverse QoS requirements and executing on terminal devices (e.g., mobile stations). A base station (BS) considers the QoS requirements and the observed QoS for each of the applications in computing the number of sub carriers allocated to each terminal device in the forward link direction in a given time slot. For allocation in the reverse link direction, the terminal device transmits a first bit indicating whether the aggregate queue lengths (of all applications) exceeds a pre-specified threshold and a second bit indicating whether a delay bound requirement is likely to be violated in the absence of sub carrier allocation. The BS computes the number of sub carriers to be allocated in the reverse link direction based on the respective two bits received from the terminal devices.

Abstract: A method of COFDM demodulation of successive symbols, each symbol comprising data carriers and pilots. The method includes, for each symbol, the determination of estimates of the transfer function of the channel for the symbol carriers, including the steps of determining, for first carriers such that, for the frequency positions of the considered carriers, symbols different from the symbol include pilots, a first estimate based on second estimates obtained for pilots having the frequency of the carrier; and determining, for second carriers, a third estimate based on the first estimates. For at least one first carrier, the first estimate is further determined based on at least the third estimate determined for a carrier of a symbol received before the symbol at the same frequency as the carrier.

Abstract: A secondary station has a receiver capable of resolving signals received (504,510) as a plurality of multipath signals from a plurality of base stations during a soft handover process. In order to decode and act upon the received signals in a very short period of time, an initial subset of received multipath signals is processed (506) to provide an estimate of the action needing to be taken by the station, which action is then implemented by the station (508). Later arriving signals are processed separately (512) and used to update the estimate, as a result of which the action already taken may be corrected (514). Such a secondary station is particularly suitable for decoding and acting upon power control commands included in received signals in a UMTS system, for which a very limited period of time is provided by the UMTS specification.

Abstract: The present invention provides a method that is implemented in a base station. The method includes predicting a transmission rate adaptation associated with a mobile unit during a first time interval. The prediction is based on a signal-to-noise ratio for transmission associated with the mobile unit in the first time interval. The predicted request is for a transmission rate adaptation that is predicted to occur during a second time interval subsequent to the first time interval. The method also includes performing a system reconfiguration or a resource reallocation for communication between the base station and the mobile unit at the predicted transmission rate during the second time interval. The system reconfiguration or the resource reallocation is performed prior to the second time interval.

Abstract: A media device, a network element and a method of enhancing use of a media device are provided. The media device is configured to receive a broadcast media stream transmitted by a broadcast system at a given frequency and a service transmission over a radio interface of a cellular telecommunication system, the transmission being associated with the media stream and comprising information about frequencies used to transmit the media stream in different locations. The media device measures signal strength of the media transmission at the frequency the transmission is received and at least at one other frequency used for transmission of the transmission, compares the measured signal strengths and switches the reception of the media transmission to another frequency if the signal strength at said frequency is greater than the signal strength at the current frequency.

Abstract: A method and system for communicating information in a cooperative relay network of wireless nodes. The wireless nodes including a source, a set of relays, and a destination. Channel state information for each channel between a particular relay of the set of relays and the destination is estimated. A subset of the relays is selected based on the channel state information. The channel state information is fed back to the subset of relays. The source node can then broadcasting data packets from the source to the subset of relays, and the subset of relays forward coherently the data packets from the subset of relays to the destination using beamforming based on the channel state information, while adjusting power to minimize a total energy consumption in the network.

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: A Doppler compensation method is used for radio transmission between a mobile body possibly but not exclusively a train and some base station, both mobile body and base station comprise respectively a transceiver connected to an antenna for the radio transmission. The method comprises the step of determining the direction of motion of the mobile body with respect to the active base station i.e. the base station to which a radio transmission link is just built. The method is then followed by the step to apply a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without a Doppler compensation.

Abstract: A time-varying multi-path generating apparatus that generates time-varying characteristics of propagation path parameters, a multi-path fading simulator, and a multi-path generating method are disclosed. The generating apparatus for simulating multi-path fluctuations in radio communications consists of a parameter control unit for controlling generation conditions of propagation paths, a data storage unit for storing propagation path generation parameters and data files, and a propagation path generating unit for generating time-varying propagation paths. Multiple time-varying amplitude functions and multiple time-varying phase functions are generated based on the data files, the propagation path generation parameters, and random numbers generated by a random number generating unit. The time-varying amplitude functions are aligned serially in the time domain such that a time-varying shadow amplitude function is obtained, which is repeated N times where N represents the number of propagation paths.

Abstract: A communication system in which circuits for generating transmitting-end synchronizing signals and receiving-end synchronizing signals can be realized easily even in the case of a data transmission rate being high and in which power consumption is low. A transmitting-end synchronizing signal selector in a transmitter selects one of a plurality of transmitting-end synchronizing signals with different phases outputted from a transmitting-end synchronizing signal generator on the basis of code-spread data to be transmitted. A transmitting-end signal output unit outputs a radio signal in synchronization with the selected transmitting-end synchronizing signal. A receiving-end synchronizing signal selector in a receiver selects one of a plurality of receiving-end synchronizing signals which are outputted from a receiving-end synchronizing signal generator and which are the same as the plurality of transmitting-end synchronizing signals on the basis of a despreading code.

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: A mobile communication device comprises a plurality of spatially and/or polar diverse antenna configurations. Signals received by each of the plurality of antenna configurations are combined in a combiner and passed to a rake receiver that can be configured to combine the signals received by each of the plurality of antenna configurations for further processing. The mobile communication device can comprises a signal adjusting network that can be configured to adjust the phase and/or magnitude of signals being received by one of the antennas.

Abstract: A Node-B/base station has an access burst detector. The access burst detector comprises at least one antenna for receiving signals from users and a pool of reconfigurable correlators. Each correlator correlates an inputted access burst code at an inputted code phase with an inputted antenna output. An antenna controller selectively couples any output of the at least one antenna to an input of any of the correlators. A code controller provides to an input of each correlator an access burst code. The code controller controls the inputted code phase of each controller. A sorter/post processor sorts output energy levels of the correlators.

Abstract: A ‘smart’ sub-channel hopping control mechanism executes one or more sub-channel selection discriminators to enable the communications controller of a spectral reuse transceiver to delineate on which of a plurality sub-channels the spectral reuse transceiver may transmit, so as to substantially reduce the likelihood of triggering squelch circuits of silent radios of primary (licensed) channel users.

Abstract: A mobile communication system controls switching a transmission diversity system for each channel, and improves the quality of the channel. When the channel type in an uplink is a channel for transmitting voice, open loop transmission diversity is used (steps S1?S3). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S1?S2). Since the open loop transmission diversity or the closed loop transmission diversity which ever is more appropriate can be used, a transmission diversity system can be appropriately switched for each channel, thereby improving the quality of the channel.

Abstract: In a radio communication system having a primary station and a plurality of secondary stations, the power of uplink and downlink channels between the primary station and a secondary station is controlled in a closed loop manner by each station transmitting power control commands to the other station. In response to these commands the receiving station adjusts its output power in steps. By combining a plurality of received power control commands before adjusting its output power the receiving station may emulate the ability to use a smaller power control step size than its minimum, thereby improving performance under certain channel conditions. In one embodiment when the required power control step size is less than the minimum step size of a particular station, that station processes a group of power control commands to determine whether to adjust its output power by its minimum step size. In an alternative embodiment the power control step size is fixed when the combining algorithm is used.

Abstract: A wireless communication system includes an access point and first and second stations. The first station transmits a first message that includes an address of a second station as a destination address and an address of the first station as a source address. The access point forwards the message including the address of the second station address as the destination address and the address of the first station as the source address. The second station receives the message from the first station during a first time interval and receives the first message from the access point during a second time interval. The second station processes the duplicate received message to produce inbound data.

Abstract: A method and arrangement for noise variance and SIR estimation in a UTRAN Node B or User Equipment estimates the SIR (SIR(l) . . . SIR(K)) at the output of a detector by using an estimate ({circumflex over (?)}2) of the detector input noise variance to provide an estimate ({circumflex over (?)}z2) of the detector output noise variance. The detector input noise variance is derived from a midamble portion in the received signal. By deriving the transfer function of the detector an estimate of the detector output noise variance is estimated. The estimated output noise variance then allows an improved estimate of the SIR (SIR(l) . . . SIR(K)) at the detected output.

Abstract: Non-line-of-sight (NLOS) identification and mitigation are carried out in a wireless positioning system based on channel statistics derived from multipath components of a received signal. The statistics may be based on the kurtosis, the mean excess delay spread, or the root mean square delay spread. The results are justified using IEEE 802.15.4a ultrawideband channel models. Amplitude and delay statistics based on the IEEE models are shown to be log-normal random variables. A joint likelihood ratio test is presented for the LOS and NLOS identification.

Abstract: A method mitigates NLOS conditions based on weighted least squares (WLS) technique, in which the weights are derived from multipath components (MPCs) of the received signals. The weighting methodology can be used with both linear and non-linear least squares models, as well as different other NLOS mitigation schemes, such as residual based algorithms or maximum likelihood techniques.

Abstract: In a wireless communication system the receiver includes a first plurality of receive chains and a second plurality of antennas. Each receive chain is selectively connectable to selected antennas. The antennas are selected based on criteria obtained from a received RF signal to produce an antenna configuration connected to the receive chains to reduce RF fading at the receiver. An electronic switch connects the antennas to the receive chains. The receiver is programmed to determine which antenna should be connected to each receive chain by the switch by measuring characteristics of the received signal for each allowed antenna configuration and selecting the best antenna configuration. Transmitters may be similarly configured.

Abstract: A remote asset management system comprising a network of programmable wireless modules, each having an antenna and an identification module and configured to communicate via a radio communication protocol. The system further includes a plurality of assets each linked to one of the programmable wireless modules and configured to be managed by the linked programmable wireless module. A remote system server service platform is configured to receive remote asset data from at least one of the programmable wireless modules, pass the remote asset data to and from the wireless modules, send messages to at least one of the programmable wireless modules, monitor the programmable wireless modules by requesting and receiving current mode information, and remotely program the programmable wireless modules.

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: Adapting a wireless communications link between a transmitter and a receiver involves reducing the RF bandwidth of an uplink communications channel to achieve a desired channel quality. The RF bandwidth of the uplink communications channel is reduced when the desired channel quality is not achieved using the entire available RF bandwidth for uplink communications. Reducing the RF bandwidth of an uplink channel enables the uplink limit of a subscriber unit to be extended beyond what is possible when the entire available RF bandwidth is used for uplink communications. Additional uplink time slots can be allocated to the uplink communications channel with the reduced RF band so that a constant overall transmission rate can be maintained between the transmitter and the receiver.

Abstract: In a RAKE receiver delays associated with multipath signals are determined by subtracting power values associated with sidelobes of a peak value for each of the multipath signals. The determination can be performed in two stages, in the first stage the determination of the delays is made without accounting for a phase difference between adjacent multipath signals, while in the second stage the determinations are made accounting for the phase difference.

Abstract: Aspects of a method and system for a single antenna receiver system for HSDPA are provided. Aspects of a method for processing RF signals, the method may comprise computing channel estimates based on a plurality of received individual distinct path signals, generating timing reference signals indicating a location of at least one of the plurality of received individual distinct path signals, combining at least a portion of the plurality of received individual distinct path signals as a signal cluster based on at least one of the computed channel estimates and said generated timing reference signals, and selecting at least one of combining and equalization processing based on at least one of the computed channel estimates and the generated timing reference signals. Aspects of a system for processing RF signals may comprise circuitry that selects at least one of combining and equalization processing based the computed channel estimates and/or generated timing reference signals.

Abstract: Multipath relative channel estimations for weighting maximal ratio combining of RAKE detectors in wireless communication systems uses maximal eigenvectors of covariance matrices of path signals. Estimates for close-in and outlying sets of symbols provides linear time change channel estimation.

Abstract: A receiver in a wireless communication system utilizes a metric to minimize the error probability in transmitted information. The receiver may use a detector utilizing multiuser detection or rake detection. The output symbols of the detector are examined and a metric is obtained related to the noise and interference that may have distorted the transmission of the symbol. This metric is supplied to a channel decoder along with the symbol to improve decoding.

Abstract: A method of employing multipath propagation in wireless radio communications uses an omnidirectional transmitting/receiving antenna at one end of a transmission link to send an interrogating signal across an environment subject to multipath disturbances to a phase-conjugating retrodirective antenna, and the retrodirective antenna returns a communication signal along the multiple pathways taken by the interrogating signal to the omnidirectional antenna despite the multipath disturbances. In a simplex communication mode, the retrodirective antenna sends a return signal mixed with a communication signal to the omnidirectional antenna. In a duplex communication mode, both an omnidirectional antenna and a phase-conjugating retrodirective antenna are operated in tandem at each end of the transmission link to provide effective two-way wireless radio transmissions.

Abstract: A transmission and reception apparatus and method for use in a wireless communication system, and an apparatus and method for adaptively transmit and receive a signal according to channel state in a wireless communication system. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver includes a signal to interference ratio estimator for estimating a signal to interference ratio of the channel using a signal transmitted from the at least one receiver; and an adaptive transmitter for transmitting data to the at least one receiver on a basis of the estimated signal to interference ratio.

Abstract: In an orthogonal frequency division multiplexed (OFDM) system, a transmitter and/or receiver communicate separate data streams on non-orthogonal spatial channels. Each spatial channel may use the same set of OFDM subcarriers and may take advantage of the multipath characteristics of the spatial channel allowing the communication of additional data without an increase in frequency bandwidth. Space-frequency subcarrier modulation assignments may be dynamically assigned on a per subcarrier basis as well as a per spatial channel basis to help maximize the data-carrying capacity of the channel. In some embodiments, each of the spatial channels may be associated with one of a plurality of spatially diverse antennas. In other embodiments, beamforming may be performed to allow the transmission and/or reception of signals within the spatial channels.

Abstract: A path searcher used in a receiver includes a power delay profile generating unit configured to generate a power delay profile based on a signal received by the receiver, a sidelobe generating unit configured to identify a sidelobe component of a path contained in the power delay profile based on a response characteristic of a band-limiting filter of the receiver, a sidelobe removing unit configured to remove the sidelobe component from the power delay profile to produce a corrected power delay profile, and a path timing detection unit configured to detect a path timing based on the corrected power delay profile.

Abstract: A device and a method at a mobile communication system which provide a flexible and realistic way of emulating the time dispersive qualities and the broadband frequency correlation qualities of a radio channel. The device includes two or more flexible delay modules, and each module is arranged to emulate a tap and a continuously varying tap attenuation can be attained to describe the variation of the radio channel over the time. The modules may be realized in SAW-technology, and continuously varying tap attenuation may be achieved by the utilization of PIN-diode attenuators.