Abstract: An enhanced Node B (eNB) for precoding is generally described. In some embodiments, a first precoding-matrix indicator (PMI) and a second PMI is received on an uplink channel from user equipment (UE). Symbols for multiple-input multiple output (MIMO) beamforming may be precoded by the eNB using a precoder matrix recommended by the first and second PMIs, for a MIMO downlink orthogonal frequency division multiple access (OFDMA) transmission. The first PMI and the second PMI are calculated by selecting a representative codeword that is indexed by i1 and i2 for a plurality of 2TX constituent beams, the 2TX constituent beam that provides the best system evaluation metric. The i1 index for wideband and the i2 index for each subband are identified from the defined 2TX constituent beam.

Abstract: A method and mobile communications device for receiving a composite signal composed of a plurality of resource elements, the plurality of resource elements including: a plurality of data resource elements subject to interference; measuring a first noise plus interference level on at least one predefined resource element from the plurality of resource elements; measuring a noise plus interference level on the plurality of data resource elements subject to interference; determining a baseline noise plus interference level common to the plurality of data resource elements subject to interference; and generating a hybrid noise plus interference level by replacing the baseline noise plus interference level with the first noise plus interference level from the at least one predefined resource element.

Abstract: A method for determining a performance of a MIMO communication is described comprising determining an estimate for the performance of the communication when using a first detection method, determining a measure of the orthogonality of a communication channel used in the communication and weighting the estimate for the performance of the communication when using the first detection method based on the orthogonality of the communication channel to generate an estimate for the performance of the communication when using a second detection method.

Abstract: A method and mobile communications device for receiving a composite signal composed of a plurality of resource elements, the plurality of resource elements including: a plurality of data resource elements subject to interference; measuring a first noise plus interference level on at least one predefined resource element from the plurality of resource elements; measuring a noise plus interference level on the plurality of data resource elements subject to interference; determining a baseline noise plus interference level common to the plurality of data resource elements subject to interference; and generating a hybrid noise plus interference level by replacing the baseline noise plus interference level with the first noise plus interference level from the at least one predefined resource element.

Abstract: A method (200) of determining mutual information of a composite receive signal, the composite receive signal comprising a reference signal and a data signal, includes the following acts: estimating (201) a base metric of the composite receive signal based on the reference signal, the base metric being indicative of a channel quality; and determining (202) the mutual information based on the base metric and the data signal.

Abstract: A method for determining a performance of a MIMO communication is described comprising determining an estimate for the performance of the communication when using a first detection method, determining a measure of the orthogonality of a communication channel used in the communication and weighting the estimate for the performance of the communication when using the first detection method based on the orthogonality of the communication channel to generate an estimate for the performance of the communication when using a second detection method.

Abstract: A method for determining a transmission direction for a communication of a network component of a radio communications network may include: determining a reference transmission direction based on a plurality of predetermined transmission directions that a network component of a radio communications network is configured to transmit at; selecting a plurality of candidate transmission directions in a spatial vicinity of the reference transmission direction, the plurality of candidate transmission directions being a subset of the plurality of predetermined transmission directions; and selecting a transmission direction for a communication of the network component from the reference transmission direction and the plurality of candidate transmission directions based on a selection criterion.

Abstract: A method for determining a transmission direction for a communication of a network component of a radio communications network may include: determining a reference transmission direction based on a plurality of predetermined transmission directions that a network component of a radio communications network is configured to transmit at; selecting a plurality of candidate transmission directions in a spatial vicinity of the reference transmission direction, the plurality of candidate transmission directions being a subset of the plurality of predetermined transmission directions; and selecting a transmission direction for a communication of the network component from the reference transmission direction and the plurality of candidate transmission directions based on a selection criterion.