Abstract: Apparatus includes a receiver and a processor. The receiver includes at least first and second processing chains. The processor is configured to select a mode from a set of modes and to operate the receiver in accordance with the selected mode. The set of modes includes a first mode and at least one of a second mode and a third mode. In the first mode the first processing chain is configured to receive and demodulate serving cell signals from at least one serving cell that serves the apparatus, and the second processing chain is configured to receive and measure signals from the one or more neighbor cells. In the second mode the first and second processing chains are configured to receive and demodulate the serving cell signals. In the third mode the first and second processing chains are configured to receive and measure the signals from the neighbor cells.

Abstract: A method includes, in a mobile communication terminal, receiving signals from a base station in a sequence of time frames. Based on the received signals, a classification of the time frames into first and second types is determined in the terminal, such that a level of interference in the time frames of the first type is lower than the level of interference in the time frames of the second type. The received signals are decoded based on the time frames and the corresponding classification.

Abstract: A method for communication includes modulating data in a wireless communication terminal to produce an aggregated-spectrum signal, which includes multiple component carriers in multiple respective spectral bands, each component carrier including a respective plurality of sub-carriers in respective frequency bins, wherein the component carriers are grouped in one or more groups. The modulated data in transmitted on the multiple component carriers at respective power levels. A single instruction, to set a power level of the component carriers in a given group, is received at the wireless communication terminal. The power level of the component carriers in the given group is set based on the single instruction, and while preserving relative power ratios among the sub-carriers within each of the component carriers.

Abstract: A mobile user equipment includes a user equipment clock and a dual mode time tracker. The clock periodically wakes up the user equipment. The dual mode time tracker uses a serving cell reference signal to correct timing errors of the user equipment clock with respect to a network clock while timing errors remain minimal and otherwise uses a serving cell synchronization signal to correct timing errors of the user equipment clock. The dual mode time tracker also sets a next wakeup time as a function at least of the size of the timing errors.

Abstract: A method includes, in a receiver, computing soft decoding metrics for decoding a received signal. The soft decoding metrics are stored in compressed form in a memory buffer. The soft decoding metrics in the compressed form are retrieved from the memory buffer, the retrieved soft decoding metrics are decompressed, and the received signal is decoded using the decompressed soft decoding metrics.

Abstract: A method includes receiving at a receiver a signal including reference symbols that is sent over a communication channel from a transmitter to the receiver. A response of the communication channel is estimated by applying one or more weighting values to the reference symbols. A noise correction factor is computed based on the weighting values. An estimate of a noise level in the received signal is computed based on the estimated response of the communication channel and the noise correction factor. The received signal is decoded based on the estimate of the noise level.

Abstract: A method includes, in a mobile communication terminal, receiving a signal including multiple instances of a synchronization signal transmitted in multiple respective time periods, wherein each instance is precoded with a respective precoding scheme that is selected from a set of precoding schemes in accordance with a precoding alternation pattern. A subset of the instances of the synchronization signal is selected, in accordance with an instance selection pattern that ensures that at least one of the instances of the synchronization signal is received in the terminal with at least a predefined quality. Only the instances belonging to the selected subset are decoded.

Abstract: A method includes receiving reference signals in a mobile communication terminal, which is designed to receive data-carrying signals that are transmitted from a base station using one of multiple predefined Modulation and Coding Schemes (MCSs). One or more pre-calculated mappings between Signal-to-Noise Ratio (SNR) and error rate for one or more of the MCSs are held in the communication terminal. The pre-calculated mappings are adjusted according to one or more transmission parameters of the data-carrying signals. Measures indicative of respective actual spectral efficiencies that are achievable by the MCSs are estimated based on the adjusted mappings using the received reference signals. A preferred MCS is selected based on the estimated measures, and feedback that is indicative of the preferred MCS is sent to the base station.

Abstract: A method for communication includes, in a transmitter having a first number of transmit antenna ports, setting an upper limit on a second number of spatial layers to be used by the transmitter to be less than the first number. An actual number of the spatial layers, which does not exceed the upper limit, is allocated for transmission to a given receiver. One or more streams of modulated symbols are mapped onto the allocated actual number of the spatial layers. The actual number of the spatial layers are transmitted from the transmitter to the given receiver.

Abstract: A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.

Abstract: A method for communication includes providing a first transceiver configured to communicate with a second transceiver over a bi-directional link having a first aggregation of frequencies that are assigned to carry first communication traffic in a first link direction from the first transceiver to the second transceiver and a second aggregation of frequencies that are assigned to carry second communication traffic in a second link direction from the second transceiver to the first transceiver. Communication feedback is transmitted from the first transceiver to the second transceiver communication feedback at an adaptive feedback rate. The feedback rate is determined so as to achieve a desired balance between the information carrying capacities of the first and second aggregations. An information carrying capacity of the second aggregation is controlled responsively to the communication feedback.

Abstract: A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.

Abstract: Briefly, a method and apparatus to calculate cross-correlation values of complex binary sequences are provided. The apparatus may include a transformation unit and a cross-correlator. The cross-correlator may include a cross-correlation controller to provide, based on a type bit and a sign bit, a real component and/or an imaginary component of signals of complex binary sequences to a real accumulator and/or to an imaginary accumulator.

Abstract: A method includes receiving signals that are transmitted over a communication channel in multiple blocks that are transmitted in respective frequency bins during respective time intervals, some of the blocks in a predefined subset of the frequency bins containing reference signals. An estimate of the communication channel, for a given block transmitted during a respective time interval, is computed by (i) computing respective interim filtering results for the blocks transmitted in the respective time interval in the respective frequency bins belonging to the predefined subset, by filtering one or more of the reference signals transmitted in the respective frequency bins of the block; and (ii) combining the interim filtering results to produce the estimate of the communication channel.

Abstract: A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.

Abstract: A communication terminal includes a receiver, a transmitter and control circuitry. The receiver is configured to receive an aggregated-spectrum downlink signal including two or more component carriers in respective spectral bands. The transmitter is configured to transmit an uplink signal to a serving base station that serves the communication terminal. The control circuitry is configured to evaluate respective channel measures of the two or more component carriers of the aggregated-spectrum downlink signal and to transmit to the serving base station a report, which is based on the channel measures and includes a respective channel quality metric for each of at least two of the component carriers.

Abstract: Briefly, according to embodiments of the invention, there is provided a wireless communication system and a method to receive by a base station from a first mobile station a first chain of data symbols transmitted by at least two antennas and having a first transmit diversity, to receive from a second mobile station a second chain of data symbols transmitted by at least two antennas and having a second transmit diversity. Both first and second chains of data symbols are transmitted from the first and second mobile stations at the same time, modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and encoded by a space time block codes scheme.

Abstract: A method includes receiving at a receiver a signal including reference symbols that is sent over a communication channel from a transmitter to the receiver. A response of the communication channel is estimated by applying one or more weighting values to the reference symbols. A noise correction factor is computed based on the weighting values. An estimate of a noise level in the received signal is computed based on the estimated response of the communication channel and the noise correction factor. The received signal is decoded based on the estimate of the noise level.

Abstract: A method in a receiver includes receiving from a transmitter an aggregated-spectrum signal including at least first and second component carriers in respective spectral bands. Information related to processing one or more of the component carriers is buffered in at least one shared buffer, such that storage locations in the shared buffer are selectably assignable for storing at least first information related to the processing of the first component carrier and second information related to the processing of the second component carrier. The one or more of the component carriers are processed in the receiver using the information buffered in the shared buffer.

Abstract: A mobile user equipment includes a user equipment clock and a dual mode time tracker. The clock periodically wakes up the user equipment. The dual mode time tracker uses a serving cell reference signal to correct timing errors of the user equipment clock with respect to a network clock while timing errors remain minimal and otherwise uses a serving cell synchronization signal to correct timing errors of the user equipment clock. The dual mode time tracker also sets a next wakeup time as a function at least of the size of the timing errors.