Abstract: A receiver may be operable to generate estimates of transmitted symbols using a sequence estimation process that may incorporate a non-linear model. The non-linear model may be adapted by the receiver based on particular communication information that may be indicative of non-linearity experienced by the transmitted symbols. The receiver may generate a reconstructed signal from the estimates of the transmitted symbols. The receiver may adapt the non-linear model based on values of an error signal generated from the reconstructed signal, and the values of the error signal may be generated from a portion of the generated estimates that may correspond to known symbols and/or information symbols. The values of the error signal corresponding to the known symbols may be given more weight in an adaptation algorithm, and the values of the error signal corresponding to the information symbols may be given less weight in the adaptation algorithm.

Abstract: A method for detecting multi-user signals including conducting a first energy burst detection detecting a first plurality of user signals as a first energy burst, attempting to decode a user signal from the first plurality of signals within the first energy burst, cancelling out a first user signal from the first energy burst if the first user signal is successfully decoded from the first energy burst, determining a second user signal to be discarded if the second user signal is not successfully decoded from the first energy burst, conducting a second energy burst detection detecting a second plurality of signals as a second burst, and iteratively cancelling out the first user signal successfully decoded from the first energy burst from the second energy burst, wherein the second energy burst detection is conducted when all user signals within the first energy burst are either cancelled out or determined to be discarded.

Abstract: The present invention relates to a method and apparatus for monitoring an antenna system comprising at least two antenna branches providing antenna diversity. At least a first signal branch measure and a second signal branch measure are repeatedly generated in response to a first signal branch and a second signal branch received by a respective one of the at least two antenna branches, thus generating a first plurality of second signal branch measure values in a manner so that the first and second pluralities reflect the quality of the first and second signal branches, respectively, at different points in time. The first and second pluralities are analysed in order to distinguish any differences in the performance of the first and second antenna branches.

Abstract: A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being at a first position in an in-phase quadrature-phase plane. A second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, and an OFDM modulation signal including the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers.

Abstract: A receiver timing error recovery loop expands the bandwidth of a received signal and determines the timing error based on the bandwidth expanded received signal.

Abstract: A method for communicating comprises generating at least one spreading code from a preferred Golay generator and/or a preferred generalized Golay generator. The preferred generalized Golay generator may comprise a plurality of preferred Golay generators. The outputs of the preferred Golay generator are logic 0 and 1. Each stage of the preferred Golay generator may comprise a single basic storage unit, such as a Flip-Flop. Generalized Golay codes comprise pseudo-complementary sequences having code lengths that differ from Golay complementary sequences and are characterized by low autocorrelation sidelobes relative to the autocorrelation peak.

Abstract: A method and arrangement are disclosed for acquiring a spread spectrum signal produced by means of transmitter-end spreading of a bit sequence using a spread code signal, which provide for the reception of the spread spectrum signal; provision of a receiver-end spread code signal which corresponds to the transmitter-end spread code signal; performance of polyphase correlations for respective different code phases which give rise to polyphase correlation results which are each associated with different code phases; filtration using at least two of the code phases; determination of an extreme value in the filtered polyphase correlation results, and determination of the code phase which is associated with the extreme value.

Abstract: Methods and systems for processing signals in a receiver are disclosed herein and may comprise generating at least one control signal that may be utilized to control a first received signal. A phase of the first received signals may be adjusted via the generated control signal so that the phase of the first received signal may be equivalent to a phase of a second received signal, where the phase of the first signal may be adjusted within a processing path used to process the first received signal. An amplitude of the first received signal may be adjusted via the generated control signal so that the amplitude of the first received signal may be equivalent to an amplitude of a second received signal, where the amplitude of the first signal is adjusted within the processing path used to process the first received signal.

Abstract: A transmitter generates and transmits a low rate signal to its intended receiver. Upon receiving the low rate signal, the intended receiver generates and transmits a channel sounding response (CSR), said CSR being a short burst having a predefined transmit format and carrying predetermined information. The transmitter then analyzes the CSR and determines uplink channel response, estimates downlink channel response, and determines appropriate transmit parameter settings based on the analysis and downlink response estimate. Adjustment of the transmit parameters can be made in either the MAC or PHY layer or in a combination of both. After adjusting its transmit parameters and modulating sub-carriers with user-data according to the determined transmit settings, the transmitter transmits the user-data to the receiver on a preferred portion of bandwidth.

Abstract: Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in an OFDM system are described. M disjoint “interlaces” are formed with U usable subbands. Each interlace is a different set of S subbands, where U=M·S. The subbands for each interlace are interlaced with the subbands for each of the other M?1 interlaces. M slots may be defined for each symbol period and assigned slot indices 1 through M. The slot indices may be mapped to interlaces such that (1) frequency diversity is achieved for each slot index and (2) the interlaces used for pilot transmission have varying distances to the interlaces used for each slot index, which improves channel estimation performance. Each data stream may be processed as data packets of a fixed size, and different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for the data packet.

Abstract: A wideband interference suppression system comprises at least one signal conditioning device receiving at least one input signal having a signal of interest portion and an interference signal portion, wherein the at least one signal conditioning device is adapted to provide selective, independent, and variable control of one of a phase, a time delay, an amplitude, a radio frequency signal division, and a radio frequency signal summation of the at least one input signal to produce a modified signal. A tunable cross correlator receives a signal representative of the modified signal and is adapted to estimate one of an amplitude, a time delay and a phase delay parameter of the interference signal portion and to generate a control logic signal therefrom, wherein the control logic signal is received by the at least one signal conditioning device for independently and selectively activating and adjusting the various components thereof to suppress the interference signal portion.

Abstract: A technique for reducing interference between a direct-sequence ultra-wideband communications system and a narrowband communications system uses interference-rejecting spreading codes to reduce signal power in a frequency band associated with the narrowband communications system. A method of operating an ultra-wideband communications system includes applying an interference-rejecting spreading code to a signal for transmission. The interference-rejecting spreading code is configured to reduce power in a particular frequency band of a transmit or receive power spectral density associated with the ultra-wideband signal without substantially reducing power outside that particular frequency band of the transmit or receive power spectral density associated with the ultra-wideband signal.

Abstract: A controller for advanced receivers configures a plurality of advanced receiver modules based on figures of merit computed on the input signal. The controller also selects the appropriate output signal based on figures of merit of either the input or the output signals. The controller decisions can also be made in a bursty manner, where only a subset of the decisions to be made are made at a given time, thereby limiting the processing load of the control processor.

Abstract: Aspects of a method and system for diversity processing utilizing a programmable interface suppression module may include one or more circuits that are operable to program an interference suppression module based on one or more interference cancellation parameters. A plurality of weighting factor values may be computed based on the one or more interference suppression parameters and a received plurality of multipath signals. A plurality of estimated signals may be generated based on the plurality of weighting factor values. A plurality of updated estimated signals may be generated based on the plurality of estimated signals. A plurality of interference suppressed signals may be generated based on the plurality of updated estimated signals.

Abstract: A signal detection apparatus 23 for determining whether a detection target signal is included in a received radio signal, includes: a waveform feature amount calculation unit 31 configured to calculate a waveform feature amount Rx? representing a waveform feature; a test statistic calculation unit 32 configured to calculate test statistic Zx? of each detection target signal by using the waveform feature amount; and a signal decision unit 33 configured to determine presence or absence of each detection target signal by comparing the test statistic Zx? of each detection target signal with a threshold ?, wherein, under a condition where a specific detection target signal is removed, the test statistic calculation unit calculates a test statistic for a detection target signal which is not removed, and the signal decision unit determines presence or absence of the detection target signal by comparing the calculated test statistic with the threshold.

Abstract: A method for providing precoding weights for data symbols of data control subframes includes generating a downlink frame having control subframes which individually correspond to one of a plurality of downlink data subframes, and inserting weight information into each of the control subframes, such that the weight information is to be applied to data symbols present in the corresponding one of the data subframes. The method further includes transmitting the control subframes and the inserted weight information to a receiving device.

Abstract: Aspects of a method and system for interference suppression in WCDMA systems may include one or more circuits that are operable to receive a plurality of multipath signals via one or more receiving antennas. A plurality of weighting factor values may be computed based on the received multipath signals. Estimated signals may be based on the weighting factor values. Residual signals may be generated based on received signals and the estimated signals. Addback signals may be generated based on the estimated signals and the residual signals. Updated estimated signals may be generated based on the addback signals and the weighting factor values. Incremental signals may be generated based on the updated estimated signals and addback signals. Updated residual signals may be generated based on the incremental signals and previous residual signals. The interference suppressed signals may be generated based on the updated residual signals and updated estimated signals.

Abstract: The present invention discloses a method of improved impairment covariance matrix estimation for a received signal in a Generalized Rake receiver arrangement. The method comprises providing for a plurality of despread pilot symbols representative of the signal and determining an estimate of an impairment covariance matrix R for the received signal. Subsequently, providing an estimate of scaling parameters ?, ? for the estimate of R by means of a weighted least squares estimate based on the color of a residual noise vector for the impairment covariance matrix estimate R, and forming an improved estimate of the impairment covariance matrix based on the weighted squares estimate.

Abstract: A maximum signal energy level among a plurality of individual distinct path signals in a wirelessly received signal cluster is detected. An early aggregate power level associated with at least a portion of the plurality of individual distinct path signals received at time instants preceding a first moment time, and a late aggregate power level associated with at least a portion of the plurality of individual distinct path signals received at time instants subsequent to the first moment time are computed. The first moment time, which corresponds to the detected maximum signal energy level, is adjusted based on the early aggregate power level and the late aggregate power level. At least a portion of the plurality of individual distinct path signals is received at a corresponding plurality of time instants within a duration comprising a delay spread of the wirelessly received signal cluster based on the adjusted first moment time.

Abstract: A method for suppressing interference in a wireless communication is provided. The method comprises receiving a burst of symbols, generating a plurality of timing hypotheses for the burst of symbols, and calculating, for each timing hypothesis, a plurality of weights for an interference suppression filter based upon a subset of the burst of symbols. The method further comprises, for each timing hypothesis, filtering the subset of the burst of symbols using the interference suppression filter with the corresponding plurality of weights, and selecting one of the plurality of timing hypotheses corresponding to a selection criteria. The method further comprises equalizing and decoding the filtered burst of symbols based upon the selected one of the plurality of timing hypotheses.

Abstract: A communication device according to an embodiment of the present invention includes a communication antenna that receives a transmission signal where a spectrum spread signal subjected to a spectrum spread is modulated; an intermediate frequency converting unit that converts the transmission signal received by the communication antenna into an intermediate frequency signal having a predetermined frequency; an analog to digital converting unit that discretizes the intermediate frequency signal and outputs a discretization signal; a noise removing unit that detects a noise other than a normal thermal noise included in the discretization signal and removes the detected noise from the discretization signal; and a demodulating unit that demodulates the spectrum spread signal, based on the discretization signal that is output from the noise removing unit.

Abstract: A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, measuring leakage of a reference signal from the first component carrier onto the second component carrier, receiving a signal on the aggregated carrier, and compensating for leakage of the signal from the first component carrier to the second component carrier based on the measurement of the leakage of the reference signal.

Abstract: Provided are a modulation method and a demodulation method for satellite communication using a widespread signal-to-noise ratio (SNR), the method including: adding a dummy frame to a broadcasting/communication signal frame for signal transmission of a digital video broadcasting-satellite second generation (DVB-S2) modulator; verifying a spreading factor; adding the same physical layer header to the broadcasting/communication signal frame to which the dummy frame is added, repeatedly the number of times corresponding to the verified spreading factor; and repeating the same data, for example, PL frame data as the physical layer header.

Abstract: Aspects of a method and system for interference suppression between multipath signals utilizing a programmable interface suppression module may include one or more processors and/or circuits that are operable to program an interference suppression module based on one or more interference cancellation parameters. A plurality of weighting factor values may be determined based on the one or more interference suppression parameters and a received plurality of multipath signals. A plurality of estimated signals may be generated based on the plurality of weighting factor values. A plurality of updated estimated signals may be generated based on the plurality of estimated signals. A plurality of interference suppressed signals may be generated based on the plurality of updated estimated signals and/or a plurality of updated residual signals.

Abstract: A novel ultra-wide bandwidth receiver structure dubbed the “zonal” receiver is proposed to detect time-hopping ultra-wide bandwidth signals in multiple access interference channels. The zonal receiver outperforms the conventional matched filter ultra-wide bandwidth receiver and the recently proposed soft-limiting ultra-wide bandwidth receiver when only MAI is present, or AWGN is negligible compared to MAI. In more practical mixed MAI-plus-AWGN environments, the zonal ultra-wide bandwidth receiver achieves better performance than the conventional matched filter ultra-wide bandwidth receiver, the recently proposed soft-limiting ultra-wide bandwidth receiver, and the recently proposed adaptive threshold soft-limiting ultra-wide bandwidth receiver. In multipath fading UWB channels, a new Rake receiver based on the zonal UWB receiver design has been proposed, this new Rake receiver can achieve better BER performance than the conventional matched filter based Rake receiver.

Abstract: A wireless system may receive a plurality of multipath signals from a plurality of transmitters and sequentially process each of a plurality of data symbols in the received multipath signals utilizing a plurality of shared hardware modules within a chip. Desired information may be recovered from data transmitted by one or more of the transmitters utilizing the interference suppressed signal. Chips of data may be cell combined utilizing one or more of shared hardware modules. The shared modules may include channel rotation modules and sum and difference modules. One or more fast Hadamard transforms and/or inverse Hadamard transforms may be performed utilizing shared hardware modules. Data symbols may be interpolated, scrambled, descrambled, and/or weighted and added back utilizing the shared hardware modules.

Abstract: The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that minimizes the probability of interfering with existing legacy users. Interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum are provided. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at multiple transceivers in a wireless network.

Abstract: Systems and methods for inter-cell interference cancellation are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a cell computation unit configured to compute receive chips for a first interfering cell and a subtraction unit configured to remove the computed receive chips for the first interfering cell from received chips at a receiver. The apparatus further comprises a processing unit configured to process the received chips with the computed receive chips for the first interfering cell removed into received symbols and a detection unit configured to detect user symbols for a target cell from the received symbols.

Abstract: Methods and systems for multi-user detection in the presence of multiple spreading factors are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises an interference computation unit configured to compute a combined interference based on detected user symbols for a first spreading factor and detected user symbols for a second spreading factor, wherein the combined interference accounts for multi-user interference from user symbols for the first and second spreading factors. The apparatus further comprises an interference cancellation unit configured to remove the computed combined interference from a plurality of received symbols corresponding to the first spreading factor and a redetection unit configured to redetect the user symbols for the first spreading factor from the plurality of received symbols with the computed combined interference removed.

Abstract: A mobile device in an OFDM system receives an OFDM signal comprising a plurality of RS tones and data OFDM symbols. The received RS tones are extracted for channel estimation, which is performed by masking channel responses of the extracted RS tones. Pointers of the extracted RS tones are shifted so that the extracted RS tones are spaced in a subcarrier at regular intervals. Pointers of associated positive counted or indexed subcarriers are shifted one subcarrier lower while no pointer shifting on associated negative counted or indexed subcarriers. IFFT operation is applied to the resulting pointer shifted RS tones to determine the channel impulse responses. Desired channel taps are weighted using non-zero masking values, while undesired channel taps and/or channel tap replicas are weighted using zero. The masked channel impulse responses are back shifted in subcarrier prior to channel equalization.

Abstract: A multi-channel receiver (200) comprises: an input (111) for receiving a wideband signal potentially comprising multiple channels, a tuner stage (110), a wideband amplifier (201) connected between the input (111) and the tuner (110), a controllable switch (202) bridging the amplifier (201) and a switch controller (203) designed to generate a switch control signal (BSC). For controlling the switch, the switch controller (203) is designed to measure at least one signal quality parameter and to generate its switch control signal (BSC) on the basis of the measured parameter. The decision of switching the switch (202) to its open state (amplifier active) is exclusively taken during at least one time interval when the receiver is switched to a channel.

Abstract: A digital receiver system to recover signals from inter-symbol-interference includes a finite impulse response (FIR) filter using convolution to recover signals; and a channel estimator coupled to the FIR filter to estimate FIR coefficients, wherein the channel estimator uses a second order expectation and a fourth order expectation from a convolution to calculate error function.

Abstract: Certain aspects of a method and system for achieving space and time diversity gain are disclosed. Aspects of one method may include modifying a generalization code of at least one pilot channel, to measure signal strengths for each of a plurality of received multipath signals. A portion of the plurality of received multipath signals may be combined based on the measured signal strengths. The signal strengths of the plurality of received multipath signals may be measured on a primary pilot channel by assigning its generalization code to zero. The signal strengths of the plurality of received multipath signals on a secondary pilot channel may measured by assigning its generalization code to a non-zero value.

Abstract: A method and apparatus for reducing the computational load associated with computing weighting factors for wireless signals received at a wireless receiver is disclosed herein. The method and apparatus reuses a covariance factor matrix to compute multiple sets of weighting factors for multiple received signals. Particular embodiments factor a covariance matrix determined for a first received signal to determine a covariance factor matrix, and use the covariance factor matrix to determine a set of weighting factors for the first received signal as well as to determine additional sets of weighting factors for one or more additional received signals. The different received signals may be associated with different times, different channelization codes, and/or different frequencies. The weighting factors may be used to weight and combine received signals in a GRAKE receiver or chip equalizer. The weighting factors may also be used to determine a signal quality metric.

Abstract: A method of controlling sampling frequency and sampling phase of a sampling device from a value generated by an equalizer coupled to the sampling device includes the steps of generating a complex representation of the value developed by the equalizer and generating a representation of a decision from an output of the equalizer. The complex representation and the decision representation are correlated to obtain a sampling error estimate. The sampling error estimate is used to adjust the sampling frequency and sampling phase of the sampling device.

Abstract: A method for encrypting an information carrier comprising generating a sequence of data using a sequence generator, modulating, using a first modulator an output from the sequence generator such that an interference signal results, encoding the interference generator's synchronization information using an encoder, modulating, using a second modulator, the encoded synchronization information such that a synchronization carrier signal results, spreading the synchronization carrier signal using a spreader such that a spread sub-carrier synchronization signal results, and combining the modulated information carrier signal, interference signal, and spread sub-carrier synchronization signal using a signal combiner such that a composite signal results, the interference signal having one or more signal characteristics that results in obfuscation of the information carrier signal when the information carrier signal and interference signal are combined.

Abstract: A receiver includes a select module, an enable module, and a receiver module. The select module is configured to detect (i) a number of antennas in the receiver, or (ii) a number of enabled receiver paths in the receiver. The select module is also configured to generate a receiver select signal and an adjustment signal based on (i) the number of antennas detected, or (ii) the number of enabled receiver paths detected. The enable module is configured to, based on the receiver select signal, (i) determine that at least one of the enabled receiver paths is an unnecessary receiver path, and (ii) disable the at least one of the enabled receiver paths. The receiver module is configured to, based on the adjustment signal, adjust a bandwidth of the receiver or coefficient values of the receiver.

Abstract: Direct detection of wireless interferers in a communication device for multiple modulation types. One or more radios implemented within a communication device is/are operative to receive and process wireless communications. A wireless communication signal is processed to extract symbols there from. Various symbols groups are processed in accordance with correlation processing to identify potential interferers (e.g., other communication devices using common portions of frequency spectra). Alternatively, matched filter processing (e.g., using a Barker matched filter in some embodiments) operates on the various symbol groups to identify some potential interferers. Various combinations of correlation processing and matched filter processing may be employed in other instances (e.g., using any of a desired means of comparison, combining, etc.) in considering interferers identified in accordance with each of these two means.

Abstract: A method for estimating hidden channel parameters of a GNSS navigation signal received in a multipath environment includes a sequential Bayesian estimation. A movement model forms the basis of the estimation and is designed especially for dynamic channel scenarios and takes into account the speeds of change and the variable life cycles of the path. The estimator is implemented as a recursive Bayesian filter for a combined determination of positions and suppression of multipaths. The binding of the delay of the direct path is taken into consideration via position and clock parameters. The method is carried out with GNSS satellite navigation receivers, e.g. GPS and Galileo. With the method, multipath error of received GNSS navigation signals is reduced. The multipath channel includes a direct path and Nm-I echo signals and each of these paths may be considered on or off for the estimation.

Abstract: A baseband processing module includes an RX interface, a rake receiver combiner module, and may include additional components. The RX interface receives the baseband signals from an RF front end and creates baseband RX signal samples there from. The rake receiver combiner module includes control logic, an input buffer, a rake despreader module, and an output buffer. The rake despreader module is operable to despread the baseband RX signal samples in a time divided fashion to produce channel symbols including pilot channel symbols and physical channel symbols.

Abstract: A method for identifying a transmitter in a digital broadcasting system includes: receiving a broadcast signal in which a TxID sequence for identification of a transmitter is embedded; correlating the received broadcast signal with a plurality of elementary code sequences of a pseudo-random sequence sequentially; and identifying the transmitter by using the correlation results.

Abstract: A receiver is provided that can receive a first signal transmitted on a first carrier and a second signal transmitted on a second carrier. The receiver includes a channel estimation portion, a multicarrier nonlinear equalizer, a first log likelihood computing portion and a second log likelihood computing portion. The channel estimation portion can output a first estimation. The multicarrier nonlinear equalizer can output a first equalized signal and a second equalized signal. The first log likelihood ratio computing portion can output a first log likelihood ratio signal based on the first equalized signal. The second log likelihood ratio computing portion can output a second log likelihood ratio signal based on the second equalized signal. The multicarrier nonlinear equalizer can further output a third equalized signal and a fourth equalized signal. The third equalized signal is based on the first signal, the second signal and the first estimation.

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: Communication signal processing entails generating an overall signal correlation estimate that reflects overall impairment present in a received signal before despreading. Processing further includes parametrically constructing one or more component-specific correction terms as a function of one or more component signal correlation estimates, each estimate reflecting a particular component of the overall impairment. Combining weights are derived, as a function of this overall estimate and the correction term(s), so that they exclude the contribution of the impairment component(s) to the overall impairment. These weights are used to combine signal samples in an equalization process. As the combining weights exclude the contribution of the impairment component(s) to the overall impairment, the equalization process utilizing the weights exclusively suppresses impairment that is not attributable to the component(s).

Abstract: Systems and methods are disclosed herein to use sieving to reduce the number of hypotheses and the length of time for acquisition of GPS satellite signals. In sieving, hypothesis testing is performed after a short non-coherent integration duration on a first set of hypotheses. At the end of the non-coherent integration time, multiple candidate hypotheses having high likelihood of signal detection are identified. Further non-coherent integration of each candidate hypothesis is performed by using a tracking loop to remove Doppler frequency and code phase variations on the signal. In parallel, additional hypotheses testing is performed on a second set of hypotheses. At the end of the next non-coherent integration time, the best candidate hypotheses among the candidate hypotheses sieved from the first set of hypotheses running in the tracking loops and the candidate hypotheses from the second set of hypotheses are identified.

Abstract: A method and device for multi-user detecting of an OFDM transmission signal are provided. The method includes: combining received signals, at corresponding time-frequency symbol positions in all of multiple repeated Block Units in relation to the same data symbol, into a received data sequence; determining a combined repeated channel response sequence array corresponding to the received data sequence; and detecting the received data sequence using the combined repeated channel response sequence array to obtain data symbols of multiple users. The technical solution can effectively restrain the multi-address interference and the interference between symbols during OFDM transmitting signal and improve the system performance greatly.

Abstract: Methods and apparatuses for decoding codewords received over a MIMO channel are provided. According to one aspect of the disclosure, a cost function is computed for each constellation point of an Mth rank or spatial layer, and Ncand of those constellation points having minimum cost are preserved as candidate points, where Ncand is a parameter specified to the decoding algorithm. In addition, a cost function may be computed for all possible transitions from the Ncand candidate points of the Mth rank to all possible constellation points of the (M?1)th spatial layer, and Ncand of those transitions having minimum cost are preserved as candidate points. The process is repeated for all spatial layers, resulting in the identification of Ncand candidate codewords and their associated cost functions.

Abstract: Methods and apparatus for dynamically allocating processing resources between low rate, e.g., standard rate, and high rate data channel processing chains are described. This allows for different numbers of high data rate and standard data rate uplink users to be supported at different times using the same set of hardware.

Abstract: Techniques for transmitting signaling with localized spreading are described. In one design, a transmitter (e.g., a base station) spreads multiple signaling symbols to obtain multiple sets of output symbols and further maps the multiple sets of output symbols to multiple time frequency blocks. The spreading may be localized to each time frequency block. Prior to the spreading, the transmitter may scale the multiple signaling symbols with multiple gains determined based on the transmit power for these signaling symbols. The transmitter may scramble the scaled signaling symbols to obtain scrambled symbols and may spread the scrambled symbols to obtain the multiple sets of output symbols. The transmitter may map each set of output symbols to a respective time frequency block.

Abstract: A transmitter includes a resistor, a protection unit, and a transmission unit. The resistor control unit controls a connection of a termination resistor between first and second transmission lines. The protection unit reduces first and second voltages, respectively, from the first and second transmission lines during a power-down mode. The transmission unit receives the dropped first and second voltages during the power-down mode and transmits first and second signals through the protection unit during a power-on mode. The resistor control unit connects the termination resistor to the first and second transmission lines when a transmission rate of the first and second signals is equal to or greater than a predetermined value. The resistor control unit is disconnected from at least one of the first and second transmission lines when the transmission rate is less than the predetermined value.