Abstract: A method and system for generating a space frequency block code relay signal includes a signal detection unit which detects a received signal by receiving a first and second source signals transmitted from a first and second source nodes, a relay signal generation unit which generates a relay signal cooperating with the first and second source signals using a space frequency block code (SFBC) scheme based on the received signal, and a signal transmitter which transmits the relay signal to a destination node.

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

Abstract: The present invention relates to a general active array antenna apparatus capable of environmentally and temporally controlling radio frequency (RF) polarization resource necessary for wireless communication in order to improve communication quality and increase communication capacity. The antenna according to the present invention has a form of an active array antenna element, wherein each active array antenna element has a structure in which it may generate orthogonal dual polarizations and includes two input terminals and output terminals. An end orthogonal dual polarization antenna is connected to a polarization control apparatus that may process analog or digital signals, and the polarization control apparatus is controlled by or communicate with an antenna main controlling apparatus performing a polarization control algorithm. Ultimately, an object of this antenna apparatus is to improve communication quality and increase communication capacity.

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

Abstract: To realize quick adaptation to a communication link between a transmitter and a receiver by using two different frequency carriers. A receiver detects a preamble from a transmission bit string. When determining that a total sum of the number of modified bits exceeds a certain threshold in a range of a payload following the preamble (when detecting that a reception state of a communication link has been degraded), the receiver issues, to a transmitter, a request for changing a transmission parameter (four parameters may be used for enhancement/lowering) for the transmission bit string by using a communication link, which is a relatively-low-frequency carrier. On the other hand, the transmitter receives the request for change, and executes the request for changing the transmission parameter for the transmission bit string while maintaining transmission of a payload in the transmission bit string.

Abstract: System and method for interference reduction in a broadband wireless access (BWA) network are disclosed. A mobile station performs a recursive process to update channel estimates of interfering channels on a symbol-by-symbol basis for use in canceling interference from data subcarriers received through two or more antennas.

Abstract: In a wireless apparatus, a first receiver receives, from a wireless reception apparatus, a transmit beam pattern with better reception quality among transmit beam patterns of a transmitter switched to by a first switching unit. A generation unit generates a transmit beam pattern obtained by rotating a phase of the received transmit beam pattern. A second switching unit switches a transmit beam pattern of the transmitter to the received transmit beam pattern and the generated transmit beam pattern. A second receiver receives, from the wireless reception apparatus, the transmit beam pattern of a combination with better reception quality out of combinations of the switched transmit beam patterns and receive beam patterns switched to by the wireless reception apparatus. A setting unit sets a transmit beam pattern of the transmitter in the transmit beam pattern received by the second receiver.

Abstract: According to one or more aspects, the teachings herein improve user equipment (UE) Channel State Information (CSI) feedback, by letting the precoder part of a CSI feedback report comprise factorized precoder feedback. In one or more such embodiments, the factorized precoder feedback corresponds to at least two precoder matrices, including a recommended “conversion” precoder matrix and a recommended “tuning” precoder matrix. The recommended conversion precoder matrix restricts the number of channel dimensions considered by the recommended tuning precoder matrix and, in turn, the recommended tuning precoder matrix matches the recommended precoder matrix to an effective channel that is defined in part by said recommended conversion precoder matrix.

Abstract: Disclosed is a digital broadcast receiver which includes a TS processing unit. The TS processing unit comprises reference packet detection units (162a, 162b), that detect timing information of two sets of received TS packet data, a delay adjustment unit (163) that aligns the processing timings of both sets of TS packet data by delaying one of the two sets of TS packet data based on the detected timing information, and a selection unit (165) that selects by packet one of the two sets of TS packet data for output.

Abstract: A low-complexity optimal soft MIMO detector is provided for a general spatial multiplexing (SM) systems with two transmit and NR receive antennas. The computational complexity of the proposed scheme is independent from the operating signal-to-noise ratio (SNR) and grows linearly with the constellation order. It provides the optimal maximum likelihood (ML) solution through the introduction of an efficient Log-likelihood ratio (LLR) calculation method, avoiding the exhaustive search over all possible nodes. The intrinsic parallelism makes it an appropriate option for implementation on DSPs, FPGAs, or ASICs. In specific, this MIMO detection architecture is very suitable to be applied in WiMax receivers based on IEEE 802.16e/m in both downlink (subscriber station) and uplink (base station).

Abstract: Techniques for sending a MIMO transmission in a wireless communication system are described. In one design, a transmitter sends a first reference signal to a receiver. The receiver selects a precoding matrix based on the first reference signal and in accordance with a selection criterion. The receiver estimates noise and interference at the receiver and determines channel quality indicator (CQI) or modulation and coding scheme (MCS) information based on the precoding matrix and the estimated noise and interference. The receiver sends the CQI or MCS information and a second reference signal to the transmitter. The transmitter selects the precoding matrix based on the second reference signal and in accordance with the same selection criterion used by the receiver. The transmitter then sends a MIMO transmission to the receiver based on the CQI or MCS information obtained from the receiver and the precoding matrix selected by the transmitter.

Abstract: Methods and apparatus for efficiently implementing a rake receiver which allows for rake receiver elements, e.g., fingers, to be dynamically assigned to antenna elements are described. In at least some embodiments multiple antennas are used. Rake elements are allocated to antennas in a dynamic manner with sets of weights also being assigned dynamically, e.g., based on channel estimates. Rake finger assignment to antenna's is made, in some embodiments, to maximize signal recovery taking into consideration the channel conditions detected by each antenna for the various delays that may be supported. Through the dynamic assignment of rake finger's to antenna's, a single rake finger may be coupled to different antennas at different times allowing for more efficient use as compared to systems where rake fingers are dedicated on a fixed basis to an individual antenna.

Abstract: Demodulation methods and apparatus for a multi-stage SLI demodulator are disclosed. Residual signals from each demodulation stage are modeled as finite sets of unresolved signals and a new metric is introduced for use in search of best candidate symbol estimates. The metric may be evaluated based on a probability distribution function of the residual signals or a probability mass function of the unresolved signals. The metric may also be approximated by the sum of a conventional Euclidean metric and a correction metric. The best candidate symbol estimates generated from each stage of the multi-stage SLI demodulator are summed to form cumulative symbol estimates.

Abstract: Techniques for assigning multipaths to finger processors to achieve the desired data performance and low power consumption are described. A search is initially performed to obtain a set of multipaths for a transmission from at least one base station. At least one multipath (e.g., the minimum number of multipaths) having a combined performance metric (e.g., a combined SNR) exceeding a threshold is identified. The at least one multipath is assigned to, and processed by, at least one finger processor to recover the transmission from the base station(s).

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

Abstract: A card device that is loaded in a mobile communication terminal and is used for wireless communication, includes a transmission and reception circuit that generates a transmission signal to be transmitted in a wireless manner based on transmission data, and processes a received signal that has been received in the wireless manner; a first antenna that is used for signal transmission and reception in the wireless manner; an antenna terminal that is connected with a second antenna that is provided in the outside of the card device; and a switch that connects in a switching manner one of the first antenna and the antenna terminal to the transmission and reception circuit.

Abstract: An RC generating unit generates a first ranging code by performing a logical operation to first seed data, repeats a process for generating a second ranging code by performing the logical operation to second seed data generated when generating the first ranging code until generation of a Nth ranging code, stores the 1st through Nth seed data corresponding to the 1st through Nth ranging codes in the memory. And the RC generating unit generates a transmission ranging code, in response to a reception of specification data of a transmission ranging code transmitted from a base station, by performing the logical operation to the seed data corresponding to the specification data.

Abstract: The diversity reception device includes an antenna switching unit configured to select and switch to a determined chain number of antennas out of a plurality of antennas; and an antenna interchange control unit configured to control the antenna switching unit to interchange an antenna. The antenna interchange control unit compares a carrier-to-noise ratio measured by a demodulation circuit of a demodulation unit of each chain, controls the antenna switching unit to sequentially switch connection with an antenna of a chain having a lowest carrier-to-noise ratio to connection with antennas connectable to the chain, and interchanges the antenna of the chain having a lowest carrier-to-noise ratio with an antenna estimated to have a highest carrier-to-noise ratio on the basis of the input level measured by the level detection unit or an antenna having a highest input level measured by the level detection unit among the connection-switched antennas.

Abstract: A method for frequency performing offset estimation and channel estimation includes performing frequency offset estimation on the received data, and obtaining a frequency offset estimation result when interference signals in received data are not obtained, After the interference signals in the received data are obtained, the method includes performing frequency offset estimation on the received data according to the interference signals, and obtaining a frequency offset estimation result. Channel estimation is performed on the received data according to the frequency offset estimation result, and a channel estimation result is obtained. Interference signals are obtained according to the frequency offset estimation result and the channel estimation result, where the interference signals are used as parameters of the frequency offset estimation.

Abstract: Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors from the same transmitted vector. For each received signal vector, the receiver evaluates a decoding metric using each possible value of the transmitted signal vector to produce a set of distances. The receiver then combines distances from across the received signal vectors to produce a combined distance associated with each possible value of the transmitted signal vector. Using the combined distances, the receiver may choose among the possible values of the transmit signal vector to determine the actual transmit signal vector.

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

Abstract: An apparatus includes Radio Frequency (RF) circuitry and baseband circuitry. The RF circuitry is configured to receive strobe messages that are based on a system clock over a digital interface, and to communicate synchronously with the system clock based on the received strobe messages in accordance with a Radio Access Technology (RAT) that is selected from among multiple different RATs. The baseband circuitry is configured to generate the strobe messages, to delay the strobe messages by a delay that depends on the selected RAT, and to send the delayed strobe messages to the RF circuitry over the digital interface.

Abstract: A received signal that includes a target signal and an interference signal is sampled in space and time and then filtered into a matched-filtered signal and into a mis-matched-filtered signal, which is orthogonal to, or nearly orthogonal to, the matched-filtered signal. The interference signal is present in both the matched-filtered signal and the mis-matched-filtered signal, whereas the target signal is present in only the matched-filtered signal. In the mis-matched-filtered signal, the interference signal is different from the matched-filtered signal in the temporal property, but is the same as the matched-filtered signal in the spatial property. After the matched-filtered signals and the mis-match-filtered signals have been obtained for the signals received by each antenna element of an array of antenna elements, they are processed to obtain a result vector, W, that is a representation of the target signal without the interference.

Abstract: The present invention relates to a method and system for communication in a mobile device. First and second OFDM symbols containing first and second received cell-specific reference subcarriers, respectively, are received. First and second received cell-specific reference subcarriers of the first and second OFDM symbols are extracted. A pair of received subcarriers is generated by computing the scalar product of the first received cell-specific reference subcarrier and the conjugate of the second received cell-specific reference subcarrier. A reference sequence is provided, that contains pairs of reference subcarriers for multiple, possible combinations of cell-IDs. The pair of received subcarriers is correlated with each pair of reference subcarriers of the reference sequence to generate cell-specific correlation values associated with each cell-ID of a plurality of cell-specific correlation values. The cell-ID of the strongest cell is determined by searching for the highest correlation value.

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

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

Abstract: A receiving station receives a waveform that includes at least a first symbol of a predetermined symbol length and comprising a first set of frequency components at predetermined carrier frequencies modulated with preamble information and a second set of frequency components at predetermined carrier frequencies modulated with information. The receiving station processes sampled values from the first symbol based on channel characteristics estimated from the first set of frequency components to decode information encoded on a first subset of the second set of frequency components. The receiving station processes sampled values from the first symbol based on channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode information encoded on a second subset of the second set of frequency components.

Abstract: A physical layer convergence protocol (PLCP) data structure transmitted in a multiple-input-multiple-output (MIMO) communication system. The PLCP data structure comprises a legacy portion including a legacy preamble and a legacy header, wherein the legacy preamble and the legacy header carry information compliant with at least a WiMedia standard; and a high throughput (HT) portion including a HT preamble and a HT header, and wherein the HT preamble carries information enabling a receiver of the MIMO communication system to decode received signals.

Abstract: Techniques for reporting channel state information (CSI) are described. A user equipment (UE) may receive data transmission from one or more cells among a plurality of cells and may report CSI for each of the plurality of cells. In an aspect, the UE may generate CSI with different quantization granularity (e.g., different codebook sizes), or different frequency granularity (e.g., different subband sizes), and/or different time granularity (e.g., different reporting intervals) for different cells based on the performance impact of each cell for data transmission to the UE. The performance impact of each cell may be determined based on a long-term channel gain or received power of the cell at the UE. The UE may quantize the CSI for each cell based on the codebook size for the cell. The UE may generate the CSI for each cell based on the subband size and/or the reporting interval for the cell.

Abstract: A quantization method for OFDM is described. In an embodiment, the method uses an objective function which is defined as a function of the quantization error of the OFDM signal in frequency summed over data subcarriers. A search algorithm is used to optimize the objective function and the solution found is quantized by rounding. The quantized value of the solution may then be fed back into the objective function to compute a value of that function and if the value is less than the value computed in a previous iteration of the method, the method is repeated using the quantized value of the solution as the new starting point for the search algorithm. If the value of the function is, however, not less than the value computed in a previous iteration, the new solution is discarded and the quantized value of the solution from the previous iteration is output.

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

Abstract: A semiconductor device includes a clock-and-data recovery circuit including a phase tracking loop that generates a phase difference signal indicating a phase difference between a reception clock generated from a transmission clock and an input signal and makes the reception clock track the input signal, a frequency tracking loop that performs control to make a frequency of the reception clock track a frequency of the input signal, the clock-and-data recovery circuit being configured to extract a data signal and a synchronization clock from the input signal and to control a phase and a frequency of the reception clock, a frequency error adjuster that increases or decreases a value indicated by a frequency adjustment signal according to a frequency difference signal generated based on the phase difference signal, and an oscillator that increases or decreases a frequency of the transmission clock based on the frequency adjustment signal.

Abstract: A method for generating a hybrid codebook for a Multi-User Multiple-input Multiple-Output (MU-MIMO) system includes the steps of: generating a parent matrix set including a plurality of M×M unitary matrices when the number of transmitter antennas is M; and generating a child matrix set dependent on the parent matrix set by using training vectors included in a random training set and each column for each unitary matrix of the parent matrix set as an initial vector codebook.

Abstract: A method and an arrangement (600) in a user equipment (140) for quantizing channel state information in a coordinated multi-point transmission radio communication system (100). A dominant path is between the user equipment (140) and a first network node (110) and a non-dominant path is between the user equipment (140) and a second network node (120, 130). A ratio of the non-dominant path channel response, such as fast fading, to the dominant path channel response is quantized by using a codebook disclosed herein. A method and an arrangement (400) for generating a codebook by applying a log squared error distortion measure in an iterative algorithm. A method and an arrangement (900) in a user equipment (140) for allocating available bits among at least two quantized ratios in a channel state information feedback procedure. The bits are allocated by means of selecting (270) at least one codebook based on statistic properties, such as path gain, of the non-dominant path.

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

Abstract: The present invention provides adjusting of a radio frequency (RF) receiver that includes processing that begins by enabling an initial setting of the RF receiver, wherein the initial setting is based on a bandwidth of a channel of a plurality of channels. The processing continues by receiving an RF signal containing a preamble of a frame via one of the plurality of channels. The processing continues by converting the RF signal to a baseband signal based on the initial setting. The processing continues by determining channel type of the one of the plurality of channels based on the baseband signal. The processing continues by determining whether the channel type corresponds to the bandwidth of the initial setting. The processing continues by, when the channel type does not correspond to the bandwidth of the initial setting, adjusting setting of the RF receiver based on the channel type.

Abstract: A multi-standby portable terminal reduces interference of the transmitting antenna by skewing electromagnetic waves of others antennas. The terminal includes: a plurality of communication modules for transmitting and receiving RF signals of different frequency bands to and from the plurality of RF communication networks; and a controller for controlling the plurality of communication modules so as to be coupled to an RF communication network selected by a user, via a communication module corresponding to the selected RF communication network. The controller performs a control operation such that the communication module corresponding to the selected RF communication network radiates electromagnetic waves corresponding to a frequency band of the selected RF communication network, and remaining communication modules radiate electromagnetic waves of frequency bands that differ from those of respective corresponding RF communication networks.

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

Abstract: A receiver is provided that is configured to estimate the symbol constellation of a signal modulated using a quaternary symbol constellation where data is transmitted to two mobile stations multiplexed on a shared channel comprising two branches, where the branches correspond to the real and imaginary parts of one complex-valued baseband signal. The receiver is configured to demodulate the modulated signal using the training sequences from both sub-channels.

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

Abstract: A system and method for optimizing the performance for MIMO are provided, the system including multiple antennas, including at least one modal antenna, wherein each of the at least one modal antenna has multiple modes corresponding to multiple radiation patterns, and a processor coupled to the multiple antennas and configured to select a mode among the multiple modes to optimize signal quality for each time interval based on a CQI by considering envelop correlation effects.

Abstract: The present disclosure provides a method and an apparatus for demodulating a downlink channel in a communication system, and a baseband chip. The demodulation method may include: obtaining RE data corresponding to the downlink channel successively from an OFDM symbol; demodulating the RE data to obtain demodulated data; filling the demodulated data to a corresponding position in a downlink channel buffer; and proceeding to obtain RE data corresponding to the downlink channel successively from a next OFDM symbol if a sequence number of the OFDM symbol does not reach a predetermined number. The present disclosure saves buffer space of the baseband chip in a UE.

Abstract: A wireless communication circuit is disclosed including: a transceiver for transmitting and receiving signals; and a control circuit coupled with the transceiver for controlling a switching circuit to switch the transceiver to a first antenna set for a first time period and then to switch the transceiver to a second antenna set for a second time period in a test period. If a throughput statistic of the first antenna set with respect to the test period is greater than that of the second antenna set, the control circuit configures the switching circuit to switch the transceiver to the first antenna set after the test period.

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

Abstract: A method implemented in a base station used in a wireless communications system is disclosed. The method comprises transmitting an index indicating data stream parameters, and transmitting an indication of the number of transmit antennas at the base station, wherein the data stream parameters for 8 transmit antennas are indicated by the index according to a first table, and wherein the data stream parameters for 4 transmit antennas are indicated by the index according to a second table. Other methods, apparatuses, and systems also are disclosed.

Abstract: The disclosure provides a multi-layer beam forming method. The method includes: according to an obtained transmitting weight value of each space channel layer, obtaining a signal-to-noise ratio of a data stream, arriving at a receiving side, of each layer; according the obtained signal-to-noise ratio of the data stream, arriving at the receiving side, of each layer, determining a data stream which is able to be transmitted; performing beam forming for the data stream which is able to be transmitted and transmitting the data stream subjected to the beam forming to the receiving side. The disclosure further provides User Equipment (UE) for implementing multi-layer beam forming. Only a data stream, which can be decoded by a receiving side, of each layer is transmitted, thereby utilizing channel capacity to the most extent while adequately and reasonably utilizing space channel resources.

Abstract: Provided is a communication system using a space division multi-user multiple input multiple output (SD-MIMO) communication method. A transmission apparatus may transmit, to each of terminals included within a coverage, common control information commonly transmitted to the terminals and individual control information individually transmitted to each of the terminals. The transmission apparatus does not precode the common control information and transmits the non-precoded common control information. The transmission apparatus precodes the individual control information and transmits the precoded individual control information.

Abstract: A method includes receiving a signal including first data precoded on the basis of a first codebook entry of a codebook, wherein the codebook includes at least one further codebook entry, averaging a set of matrices to obtain a mean matrix wherein each matrix of the set of matrices is determined on the basis of a respective other codebook entry of the at least one further codebook entry and determining a covariance matrix on the basis of the mean matrix.

Abstract: A transmitted signal estimate based on signals received in a layer i within a multiple input, multiple output transmission system and based upon selected constellation points for other, previously processed layers is quantized to a nearest constellation point. A list of candidates headed by the nearest constellation point and with remaining candidates presorted by proximity to the head is selected, for each such quantized estimate based on constellation point selections for previously processed layers. To select K best candidates for the transmitted signal estimates of the current layer i, the proximity of the candidates at the head of each list to the signal estimate for the current layer are compared, and the closest candidate is selected. The list containing the selected candidate is advanced, and proximity of the transmitted signal estimate to all list heads is again evaluated and the closest candidate selected.

Abstract: Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals.