Abstract: An apparatus, method and computer program is described comprising: transmitting signals from a transmitter of a multiple-input single-output transmission system to a receiver of the transmission system, wherein the transmitter communicates with the receiver over a plurality of channels of the transmission system, wherein the transmitter includes a transmitter algorithm having at least some trainable weights, wherein said transmitter algorithm converts a sequence of coded bits into time domain baseband symbols for transmission over said channels; updating weights of said transmitter algorithm based on a loss function, said loss function having a first loss term, a second loss term and a variable defining a weighting of those loss terms, wherein the first parameter relates to an information rate of communications from the transmitter to the receiver; and repeating the transmitting and updating until a first condition is reached.

Abstract: It is provided a method, comprising identifying a value of an onsite channel characteristic of a receive channel; requesting a neural network parameter, wherein the request comprises an indication of the onsite channel characteristic; monitoring if the neural network parameter is received in response to the request; estimating the receive channel by a neural network using the neural network parameter if the neural network parameter is received.

Abstract: A method of channel estimation for an antenna array is disclosed. The method includes, receiving a signal transmitted by the antenna array, obtaining a neural network model trained for channel estimation using the received signal, inputting a representation of the received signal into the neural network model and generating a channel estimate for the received signal, and deciding whether to employ a further neural network model for the channel estimation.

Abstract: An apparatus comprises: a first plurality of first radio frequency chains; a second plurality of second radio frequency chains, the first radio frequency chains being configured to produce wider side-band emissions than the second radio frequency chains; at least one antenna array comprising antenna elements, each of a first plurality of the antenna elements being coupled with a corresponding one of the first plurality of first radio frequency chains, the first plurality of first radio frequency chains being configured to cause transmissions predominately in a first band within a channel, each of a second plurality of the antenna elements being coupled with a corresponding one of the second plurality of second radio frequency chains, the second plurality of second radio frequency chains being configured to cause transmissions predominately in at least one second band within the channel.

Abstract: It is provided a method, comprising identifying a value of an onsite channel characteristic of a receive channel; requesting a neural network parameter, wherein the request comprises an indication of the onsite channel characteristic; monitoring if the neural network parameter is received in response to the request; estimating the receive channel by a neural network using the neural network parameter if the neural network parameter is received.

Abstract: According to embodiments of the present disclosure, downlink beamforming in MU-MIMO systems is proposed. Embodiments of the present disclosure take practical receivers into consideration, to further mitigate the interferences sensed by terminal devices. The beamforming scheme according to embodiments of the present disclosure has many advantages. For example, embodiments of the present disclosure tackle interferences from terminal device view, to mitigate the interferences which really affect the received signals of terminal devices. Embodiments of the present disclosure do not assume that terminal devices utilize Eigen receivers but consider more practical receivers used by the terminal devices to mitigate the interferences. Embodiments of the present disclosure have high flexibility, different interference cancelling methods can be used to replace the ZF method.

Abstract: An apparatus is provided that includes circuitry for decomposing an input signal to multiple substantially constant-envelope components and an outphasing path for each substantially constant-envelope component. The apparatus also includes a modulator for discrete phase control in each outphasing path, an amplifier in each outphasing path and a combiner for combining output signals from the outphasing paths. A system and method are also provided.

Abstract: Embodiments of the present disclosure relate to compressed channel state information transfer. According to embodiments of the present disclosure, the radio unit at the base station receives signals from the terminal device. The radio unit (RU) compresses the signal based on the weights of beams and transmits the compressed signal to the baseband unit (BBU) at the base station. The baseband unit reconstructs the channel based on the compressed signal and the coefficients. In this way, the amount of information conveyed across the RU-BBU interface is reduced, and the accuracy of channel estimation is improved. Further, the sounding reference signal (SRS) channel can be obtained at the BBU with reduced number of SRS transmissions.

Abstract: An apparatus, method and computing program is described including: receiving one or more received symbols and one or more received bits, wherein the received symbols are received at a receiver of a transmission system including a transmitter, a channel, and the receiver; converting one or more of the received bits that are deemed to be correct into one or more estimated transmission symbols; generating an estimated channel transfer function based on one or more of the estimated transmission symbols and corresponding received symbols; and providing training data pairs, each training data pair including a first element based on the estimated channel transfer function and a second element based on the corresponding received symbols.

Abstract: An apparatus, method, and non-transitory computer readable medium performing estimating spatial overlap of beams associated with one or more combinations of at least two user devices of a plurality of user devices of a mobile communications system based, at least in part, on angular direction of radiated power of the user devices, wherein the user devices include candidate user devices to be scheduled on a network resource for multi user channel transmission; and determining scheduling metrics associated with the one or more combinations of the at least two user devices of the plurality of user devices based on the estimated spatial overlap.

Abstract: An apparatus comprises: a first plurality of first radio frequency chains; a second plurality of second radio frequency chains, the first radio frequency chains being configured to produce wider side-band emissions than the second radio frequency chains; at least one antenna array comprising antenna elements, each of a first plurality of the antenna elements being coupled with a corresponding one of the first plurality of first radio frequency chains, the first plurality of first radio frequency chains being configured to cause transmissions predominately in a first band within a channel, each of a second plurality of the antenna elements being coupled with a corresponding one of the second plurality of second radio frequency chains, the second plurality of second radio frequency chains being configured to cause transmissions predominately in at least one second band within the channel.

Abstract: An apparatus is provided that includes circuitry for decomposing an input signal to multiple substantially constant-envelope components and an outphasing path for each substantially constant-envelope component. The apparatus also includes a modulator for discrete phase control in each outphasing path, an amplifier in each outphasing path and a combiner for combining output signals from the outphasing paths. A system and method are also provided.

Abstract: A method and device, the method comprising receiving (S1) sounding reference signal (SRS) information or demodulation reference signal (DMRS) information, determining (S2) a channel estimate of a channel for a set of users depending on the information, determining (S3) an active user subset ({1, . . . , K}) of the set of users depending on the information, determining (S4) weights (W(i)) for long term beamforming depending on the channel estimate and on the active user subset ({1, . . . , K}).

Abstract: The invention relates to a method for channel estimation in a wireless communication system. The communication system includes a communication unit provided with a plurality of antennas, and one or more terminals. First, pilot signals are transmitted from each antenna towards the one or more terminals. At the terminals correlative coding is performed with respect to the transmitted pilot signals to form correlatively coded pilot signals. The correlatively coded pilot signals are then retransmitted from the one or more terminals to the plurality of antennas of the communication unit. The communication unit then estimates uplink channels between the one or more terminals and the plurality of antennas based on the correlatively coded pilot signals. Finally, estimates of the downlink channels between the plurality of antennas and the one or more terminals are obtained based on the estimated uplink channels.

Abstract: A system, apparatus, method, and non-transitory computer readable medium for haptic augmented reality (AR) based feedback for user-centric wireless network may include a mobile device including a display device configured to display an AR user interface of a user's physical location, a location sensor configured to obtain real-time physical location information related to the mobile device, at least one wireless transceiver configured to determine characteristics of at least one wireless network, a camera configured to obtain at least one image of the user's physical location, a memory having computer readable instructions stored thereon, and at least one processor configured to execute the computer readable instructions to provide haptic AR based feedback for user-centric wireless networks.

Abstract: The invention relates to a method for channel estimation in a wireless communication system. The communication system includes a communication unit provided with a plurality of antennas, and one or more terminals. First, pilot signals are transmitted from each antenna towards the one or more terminals. At the terminals correlative coding is performed with respect to the transmitted pilot signals to form correlatively coded pilot signals. The correlatively coded pilot signals are then retransmitted from the one or more terminals to the plurality of antennas of the communication unit. The communication unit then estimates uplink channels between the one or more terminals and the plurality of antennas based on the correlatively coded pilot signals. Finally, estimates of the downlink channels between the plurality of antennas and the one or more terminals are obtained based on the estimated uplink channels.

Abstract: A cellular telecommunication system comprising at least two communicatively coupled radio transmitter stations is described, wherein the stations are communicatively coupled via a backhaul link. Each base station is capable of beamforming, i.e. controlling the propagation direction of a transmitted radio signal. The radio base stations mutually exchange information regarding the beamforming in order to iteratively optimize the system performance (e.g. throughput, fairness, etc.).

Abstract: A cellular telecommunication system comprising at least two communicatively coupled radio transmitter stations is described, wherein the stations are communicatively coupled via a backhaul link. Each base station is capable of beamforming, i.e. controlling the propagation direction of a transmitted radio signal. The radio base stations mutually exchange information regarding the beamforming in order to iteratively optimize the system performance (e.g. throughput, fairness, etc.).