Cohere Technologies, Inc.

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

A method of wireless communication includes performing a first measurement of a wavefront received at a first antenna of a base station configured to provide a wireless communication access to user devices in a coverage area, performing a second measurement of the wavefront received at a second antenna of the base station, wherein the first antenna and the second antenna are separated by a separation distance along a direction, deriving a compensation factor from the first measurement and the second measurement, wherein the compensation factor is used for estimating an estimated angle of arrival (AOA) and performing the subsequent communication by applying the compensation factor to an outgoing or an incoming signal waveform to or from a user device.

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid. In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.