Abstract: A network entity can be in a communications network that includes a plurality of network nodes communicatively coupled to the network entity via a cascaded topology. The network entity can transmit scheduling information to a first network node of the plurality of network nodes. The network entity can further receive an indication of an intermediate beamforming weight from the first network node. The network entity can further determine a part of a frequency-domain beamforming weight based on the indication of the intermediate beamforming weight. The network entity can further transmit an indication of the part of the frequency-domain beamforming weight to the first network node. The network entity can further communicate data with the communication device via the first network node.

Abstract: A method performed by a distributed base station system of a wireless communication network. The distributed base station system comprises a base band unit (BBU) and a remote radio unit (RRU) connected to each other over a fronthaul link. The method comprises receiving uplink signals at N antennas of the RRU from a number of user equipment (UEs) connected to the RRU. The BBU determines first beamforming weights based on a first reference signal that is has received from the UEs and sends the first beamforming weights to the RRU. The RRU then determines intermediate signals from the first beamforming weights and the uplink signals and sends the intermediate signals to the BBU. The BBU then determines second beamforming weights from a second reference signal it has received from the RRU. Then, the BBU determines an output signal based on the intermediate signal and the second beamforming weights.

Abstract: Disclosed is a method performed by a first radio unit, RU, of a distributed base station system. The distributed base station system further comprises a Baseband Unit, BBU, connected to the first RU over a fronthaul link and a second RU connected to the first RU over an RU link. The first RU determines first part of beamforming weights that it uses for performing a first part of the beamforming of uplink signals received at its antennas into intermediate signals. The first RU further determines intermediate beamforming weights to be used for a second part of beamforming at the BBU. The first RU further receives, from the second RU, intermediate signals and intermediate beamforming weights determined by the second RU. The first RU combines the intermediate signals and sends them to the BBU. The first RU further combines the intermediate beamforming weights and sends them to the BBU.

Abstract: Disclosed is a method performed by a first radio unit, RU, (140) of a distributed base station system (100), the first RU (140) comprising Ni antennas (141, 142), the distributed base station system (100) further comprising a first aggregation unit, AU, (120) connected to the first RU (140) via a first AU fronthaul, FH, link (145) and a second RU (150) connected to the first AU (120) via a second AU FH link (155), the second RU (150) comprising N2 antennas (151, 152), the distributed base station system (100) further comprising a BBU (110) connected to the first AU (120) over a first BBU FH link (115). The method comprises receiving, from a first number of UEs (181, 182, 183), uplink, UL, data streams comprising first user layers of the first number of UEs (181, 182, 183).

Abstract: Disclosed is a method performed by a first radio unit, RU, (140) of a distributed base station system (100), the first RU (140) comprising Ni antennas (141, 142), the distributed base station system (100) further comprising a first aggregation unit, AU, (120) connected to the first RU (140) via a first AU fronthaul, FH, link (145) and a second RU (150) connected to the first AU (120) via a second AU FH link (155), the second RU (150) comprising N2 antennas (151, 152), the distributed base station system (100) further comprising a BBU (110) connected to the first AU (120) over a first BBU FH link (115). The method comprises obtaining a first downlink, DL, channel estimate of a communication channel between the first RU (140) and a first number of UEs (181, 182, 183), determining first intermediate beamforming weights, BFW, and sending, to the first AU (120), the determined first intermediate BFW.

Abstract: A method by a RU node for performing frequency-domain beamforming for communication between a base station (BS) and UEs in a network using a multiple antenna system, the BS including a DU node connected to the RU node, the method including: obtaining uplink signals including K user-layer signals overlaid with interference signals and noise as received at N antennas from a number of UEs; determining: a channel estimation matrix H of wireless communication channels between a number of UEs and N antennas; an estimate of an Interference plus Noise covariance matrix Q based on H and other channel information; a first part beamforming weights, BFWs; an effective channel matrix Heff based on H and the first part BFWs; and intermediate uplink signals having K components and based on the uplink signals and the first part BFWs; and sending Heff and the intermediate uplink signals towards the DU node.

Abstract: A head-mounted device may have an inner display that displays images for a user and an outer display that informs nearby people of the status of the user and inner display. For example, the outer display may display an image of a face, an abstract layer, or both, depending on whether the inner display is operating in passthrough mode, mixed reality mode, or virtual reality mode. An ambient light sensor in the head-mounted device may be used to measure the brightness and color of ambient light. The white point of the face layer on the outer display may be adapted to the color of ambient light, whereas the white point of the abstract layer on the outer display may remain fixed. The white point of a display may be a correlated color temperature setting (e.g., measured in degrees Kelvin) that determines the warmth or coolness of displayed colors.

Abstract: This invention relates to a muffler having a purifying system for separating solid contents and eliminating poisonous gases such as carbon monoxide by means of an electrolysis apparatus which continuously provides oxygen separated from water to react with the carbon monoxide into carbon dioxide.