In order to cancel any interference due to the second signal (e.g., from a non-serving cell) from a signal received at a UE, without receiving additional control information, the UE blindly estimates parameters associated with decoding the second signal. This may include determining a metric based on sets of symbols associated with the signals in order to determine parameters for the second signal, e.g., the transmission mode, modulation format, and/or spatial scheme of the second signal. The parameters for the signal may be determined based on a comparison of the metric with a threshold. When a spatial scheme and a modulation format is unknown, the blind estimation may include determining a plurality of constellations of possible transmitted modulated symbols associated with a potential spatial scheme and modulation format combination. Interference cancellation can be performed using the constellations and a corresponding probability weight.

A control apparatus includes a determination unit configured to determine first and second reception weight matrixes by using first and second channel matrixes between first and second radio apparatuses and the first and second terminals, a first calculation unit configured to calculate a data channel matrix of a data signal transmitted from the first radio apparatus to the first terminal by using the first channel matrix and the first reception weight matrix, a second calculation unit configured to calculate an interference channel matrix of interference to the second terminal caused by the first radio apparatus by using a third channel matrix between the first radio apparatus and the second terminal and the second reception weight matrix, and a third calculation unit configured to calculate a transmission weight matrix for transmitting a data signal so that the interference is suppressed by using the data channel matrix and the interference channel matrix.

A terrestrial high frequency data communication system and method for implementing a pointing algorithm for endpoint nodes are described. The system includes an aggregation node and one or more endpoint nodes. In one example, a pointing direction for an endpoint node is determined based on a number of packet error rate (PER) measurements associated with a high frequency data communication link between the endpoint node and an aggregation node. Preferably, the endpoint node includes a steerable antenna module that includes one or more antennas. The steerable antenna module is configured to receive an azimuth value and an elevation value determined based on PER measurements associated with the high frequency data communication link, and to steer its one or more antennas based on the azimuth value and the elevation value to point to the aggregation node.

Systems and methods relating to cell detection are disclosed. In some embodiments, systems and methods are disclosed for performing cell detection while suppressing interference from either a current serving cell or a previous serving cell of a wireless device depending on whether the wireless device is approaching the current serving cell or leaving the current serving cell. In this manner, cell detection is improved in a manner that is particularly suitable for, e.g., high speed train scenarios, but the systems and methods disclosed herein are not limited thereto.

A terrestrial high frequency data communication system and method for implementing a pointing algorithm for endpoint nodes are described. The system includes an aggregation node and one or more endpoint nodes. In one example, a pointing direction for an endpoint node is determined based on a number of packet error rate (PER) measurements associated with a high frequency data communication link between the endpoint node and an aggregation node. Preferably, the endpoint node includes a steerable antenna module that includes one or more antennas. The steerable antenna module is configured to receive an azimuth value and an elevation value determined based on PER measurements associated with the high frequency data communication link, and to steer its one or more antennas based on the azimuth value and the elevation value to point to the aggregation node.

A front-end antenna system for transmitting and receiving one or more beams and including at least one of a radio frequency (RF) stage, an intermediate frequency (IF) stage, and a digital stage includes one or more beam networks configured to form one or more signal streams over the one or more beams, where each beam network from among the one or more beam networks comprises a beamformer network, a switching network, or a combination thereof. The front-end antenna system includes an array of antennas configured to output each of the beams in a selected spatial region from among a plurality of spatial regions, where one or more antennas from among the array of antennas are multiport antennas. The front-end antenna system includes a plurality of transceivers that electrically couple the array of antennas and the one or more beam networks.

The beamforming system includes a plurality of beamformers operatively coupled to each other. Each beamformer includes a plurality of signal generation units and a plurality of respective delaying units. Each beamformer includes a plurality of multipliers assigned to each delaying unit. Each beamformer includes a plurality of summers configured to receive a respective group of conditioned signals from a respective group of the plurality of multipliers, combine the respective group of conditioned signals and generate a respective phased array output signal. Each of the summers is configured to receive at least another input other than the respective group of conditioned signals. The plurality of beamformers are interconnected such that each of the plurality of summers within each beamformer receives, as the at least another input, a respective phased array output signal from a summer of a different one of the plurality of beamformers. As associated method is also provided.

According to one example embodiment, a method is provided including initializing a first recurrent neural network with a first vector; iteratively training a weight matrix for one or more layers of the first recurrent neural network, wherein W(t) is the weight matrix of the layer of the first recurrent neural network corresponding to iteration t, and wherein W(t) is based at least on a channel covariance matrix; the first vector; and an output from a previous layer of the first recurrent neural network corresponding to iteration, t−1: and determining a first eigenvector based on a converged output from the first recurrent neural network, wherein the first eigenvector is used to perform beamforming for multiple input multiple output reception and/or transmission.

An equipment comprising an array of radio antennas and a switching device placed as a cutoff between the antennas and the associated reception channels, the switching device comprising a first so-called operational operating mode wherein each input interface is then connected directly to a different output interface so as to connect each antenna with at least the associated reception channel thereof, and a second so-called calibration operating mode, wherein an input interface corresponding to a predetermined antenna is then connected to all the output interfaces so as to transmit the electrical signal coming from the predetermined antenna to all the reception channels, the equipment being adapted for implementing a method for autocalibration of the reception channels when the switching device is in the second operating mode.

In one implementation, a wireless communications terminal includes a multi-element antenna. In addition, the terminal includes preliminary signal combiners to combine received signals output by corresponding pairs of antenna elements. For each preliminary signal combiner, the signal output by a first of the pair of elements provides a model of interference present in the received signal output by the second of the pair of elements. The preliminary signal combiner is configured to combine the signal output by the first element with the signal output by the second element to produce an initial interference-mitigated signal. The terminal also includes phase shifters to apply complex weights to interference-mitigated signals to produce complex-weighted versions of the interference-mitigated signals and effectively steer a main beam of the antenna to facilitate reception of a desired signal and another signal combiner to combine the complex-weighted versions of the interference-mitigated signals to produce an interference-mitigated output signal.