Abstract: Apparatus having corresponding methods and computer programs comprise: a plurality of antennas located in a first cellular telephone cell; an interference module to identify wireless cellular telephone signals received by the plurality of antennas from one or more cellular telephones located in one or more second cellular telephone cells; and a cell module to identify the one or more second cellular telephone cells based on the wireless cellular telephone signals received by the plurality of antennas from the one or more cellular telephones located in the one or more second cellular telephone cells.

Abstract: A method of mitigating interference from a transmitter of a communication device at a receiver of the same communication device, where the communication device operates according to at least a first and a second communication protocol, includes generating, in the transmitter, a transmit signal conforming to the second communication protocol, generating an interference estimate signal from the transmit signal using an adaptive filter, and receiving a receive signal at the receiver. The receive signal includes a desired component conforming to the first communication protocol and an interference component corresponding to the transmit signal. The method also includes processing the receive signal using the interference estimate signal to remove at least a portion of the interference component from the receive signal.

Abstract: In accordance with an embodiment, there is provided a method comprising receiving, at a receiver, a desired signal and an interfering signal, wherein the interfering signal was transmitted with a modulation unknown to the receiver; identifying a likely modulation corresponding to the modulation with which the interfering signal was transmitted; and decoding the desired signal using a modulation dependent multiple-input multiple output (MIMO) detection, wherein the modulation dependent MIMO detection is based at least in part on the identified likely modulation corresponding to the modulation with which the interfering signal was transmitted, wherein the modulation dependent MIMO detection includes maximum likelihood (ML) detection.

Abstract: A processing method and a transceiver for channel changing in a joint transceiving mode are provided. The method includes: performing fault detection for one or more direct channels; after a fault is detected on a direct channel, stopping sending signals on the direct channel; detecting whether the direct channel with fault has been recovered; and when recovery of the direct channel with fault is detected, resuming sending signals on the direct channel.

Abstract: A method and apparatus for crosstalk channel estimation based on a measured signal-to-noise (SNR) of a loaded line. The method for channel estimation includes: loading, on a newly added line K, a combination of K?1 signals sent on lines 1 to K?1; obtaining a measured SNR of the line K loaded with the combination of the K?1 signals sent on the lines 1 to K?1; and calculating crosstalk channels of the line K according to K?1 coefficients of the K?1 signals sent on the lines 1 to K?1 and the measured SNR. Embodiments of the present invention may be used for relevant network communications systems such as xDSL systems.

Abstract: In the field of communications technologies, a method, an apparatus, and a system for channel estimation are provided. The method for channel estimation includes the following steps. An error signal returned by a terminal is received, where the error signal is an error signal of at least two tones in a downlink frequency band. Channels of the at least two tones are obtained according to the error signal. The channels of the at least two tones are interpolated, and channels of remaining tones in the downlink frequency band are obtained. In the method, the apparatus, and the system for channel estimation, a convergence speed of the channel estimation is improved by reducing data of error signals returned by the terminal.

Abstract: A method and apparatus for crosstalk channel estimation based on a measured signal-to-noise (SNR) of a loaded line. The method for channel estimation includes: loading, on a newly added line K, a combination of K-1 signals sent on lines 1 to K-1; obtaining a measured SNR of the line K loaded with the combination of the K-1 signals sent on the lines 1 to K-1; and calculating crosstalk channels of the line K according to K-1 coefficients of the K-1 signals sent on the lines 1 to K-1 and the measured SNR. Embodiments of the present invention may be used for relevant network communications systems such as xDSL systems.

Abstract: Systems and methods for estimating characteristics of a channel are provided. A transmission of known reference data is received at a receiving device. The reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers. Characteristics of the channel are determined based on the known reference data, where the determining includes a joint estimation of the one or more desired layers and the one or more interfering layers. The determining includes selecting certain of the layers to be estimated at each of the known reference data and selecting certain of the layers to be estimated over a range of the known reference data. The determining includes solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections. The selections reduce a number of unknown values in the equation.

Abstract: A method, a system, and a device for rapidly exiting training are provided. The method includes: in a training procedure of a Vectored-Digital Subscriber Line (DSL) filter, comparing a feedback error value of the filter and/or a swing range of a filter coefficient with a preset threshold, and determining whether the filter meets a convergence condition according to a comparison result; and exiting the training procedure of the filter when the filter meets the convergence condition. The method, system, and device are applicable to a training procedure of a Vectored-DSL precoder or canceller, so as to rapidly exit the training procedure.

Abstract: A base station including a plurality of codebooks embodied on a computer readable storage medium. The base station further includes a transceiver configured to i) notify a first receiver of a first codebook of the plurality of codebooks to be used for transmissions between the base station and the first receiver, ii) notify a second receiver of a second codebook of the plurality of codebooks to be used for transmissions between the base station and the second receiver, iii) receive, from the first receiver, a first precoding vector from the set of precoding vectors in the first codebook, iv) receive, from the second receiver, a second precoding vector from the set of precoding vectors in the second codebook, v) transmit, in accordance with the first precoding vector, first data to the first receiver, and vi) transmit, in accordance with the second precoding vector, second data to the second receiver.

Abstract: A method, a system, and a device for power adjustment are provided. The method includes: determining whether transmission power of a line needs adjustment according to feedback errors during a training procedure of a Vectored-Digital Subscriber Line (Vectored-DSL) filter; and adjusting the transmission power when the transmission power of the line needs adjustment. By automatically determining whether the transmission power needs adjustment during a training procedure of a precoder or canceller, and adjusting the transmission power automatically when the transmission power needs adjustment, interference to other subscribers caused by the precoder or canceller during the training procedure is reduced, and call drops of the other subscribers are prevented.

Abstract: Systems and/or methods are described for use of progressively higher-resolution codebooks for communication with one or more receivers within a cell of a base station.

Abstract: The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation.

Abstract: The method is used for estimating a Far-End Crosstalk channel imposed by a first line onto a second line in a two-line pair scenario, and includes: activating a first line independently, and obtaining a line noise of the first line as a first line noise; activating the first line and a second line, and obtaining a line noise of the first line as a second line noise; and determining a Far-End Crosstalk channel imposed by the second line onto the first line to be: (the second line noise?the first line noise)/a transmit power spectral density of the second line, where the transmit power spectral density of the second line is known.

Abstract: The present invention provides a method, an apparatus and a system for managing a line between an access device and a terminal, where the provided method includes: receiving, by an access device, a port number, an event set and a collection period delivered by RDC; judging, according to the collection period, whether an event in the event set occurs to lines corresponding to the port number; if an event in the event set occurs to one or more of the corresponding lines, saving the corresponding port number, the event that occurs and a time when the event occurs; and uploading, according to a preset uploading number, the port number, the event that occurs and the time when the event occurs that are saved to the RDC, which are further uploaded to a line management center by the RDC for an analysis to identify positions of the lines.

Abstract: A communication system includes a transmitter. The transmitter transmits information by using a plurality of pre-coding codebooks.

Abstract: An equalization method and apparatus for a communication system having a first transceiver device that communicates with each of a plurality of second transceiver devices receives a data transmission over a subset of frequency sub-carriers allotted to each second transceiver device. The communication channel between first transceiver device and the plurality of second transceiver devices is partitioned in a plurality of frequency sub-carriers of which the frequency sub-carriers allotted to a second transceiver device is a subset. The data transmission is transformed from a time-domain transmission to a frequency domain transmission. An equalization filter is applied separately to each of the frequency sub-carriers within the subset of frequency sub-carriers.

Abstract: A method, a system, and a device for rapidly exiting training are provided. The method includes: in a training procedure of a Vectored-Digital Subscriber Line (DSL) filter, comparing a feedback error value of the filter and/or a swing range of a filter coefficient with a preset threshold, and determining whether the filter meets a convergence condition according to a comparison result; and exiting the training procedure of the filter when the filter meets the convergence condition. The method, system, and device are applicable to a training procedure of a Vectored-DSL precoder or canceller, so as to rapidly exit the training procedure.

Abstract: A method, a system, and a device for power adjustment are provided. The method includes: determining whether transmission power of a line needs adjustment according to feedback errors during a training procedure of a Vectored-Digital Subscriber Line (Vectored-DSL) filter; and adjusting the transmission power when the transmission power of the line needs adjustment. By automatically determining whether the transmission power needs adjustment during a training procedure of a precoder or canceller, and adjusting the transmission power automatically when the transmission power needs adjustment, interference to other subscribers caused by the precoder or canceller during the training procedure is reduced, and call drops of the other subscribers are prevented.

Abstract: A cellular system utilizes different codebooks of precoding vectors for different receivers within a particular cell. A set of different codebooks is designed and then used by a base station as a basis to allocate to various receivers in a dynamic fashion. In at least some embodiments, the codebooks are designed to be non-overlapping in angular space. For example, codebooks can be designed to be generally orthogonal to one another thereby increasing the separation between receivers that use the different codebooks. In at least some embodiments, codebooks can be allocated responsive to a determination that two or more receivers are geographically proximate one another in a manner which would permit an undesirable amount of interference. In yet other embodiments, codebooks can be allocated in a more random fashion.