A CBSR configuration can include a set of restricted beams. Each restricted beam can be constrained by a maximum gain. A set of beams including one or more restricted beams can be selected based on received reference signals. A set of precoder coefficients, each forming a beam gain, can be determined for each selected beam. A function of the set of precoder coefficients can satisfy the maximum gain constraint. The function can be proportional to an average of amplitudes of members of a subset of the set of precoder coefficients or a square root of an average of squared values of amplitudes of members of the subset. A CSI report including at least an indicator of the set of selected beams, an indicator of the set of precoding coefficients, and coefficients of the selected beams can be transmitted.

A CBSR configuration can include a set of restricted beams. Each restricted beam of the set of restricted beams can be associated with a restricted beam gain coefficient. A plurality of sets of quantized coefficients can be determined based on the CBSR configuration. A set of quantized coefficients corresponding to a particular restricted beam can generate a set of quantized weights at a set of frequencies based on a least a Fourier transform of the set of quantized coefficients of the particular restricted beam. The plurality of sets of quantized coefficients can be determined such that quantized weights of the particular restricted beam satisfy a constraint based on at least the set of quantized coefficients corresponding to the particular restricted beam and the restricted beam gain coefficient. A CSI report can be transmitted. The CSI report can include the plurality of sets of quantized coefficients.

An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.

A beam former module includes a package base and an interconnect structure formed within the package base. The beam former module also includes a first true time delay (TTD) module attached to the package base. The first TTD module includes a plurality of switching elements configured to define a signal transmission path between a signal input and a signal output of the first TTD module by selectively activating a plurality of time delay lines. The signal input and the signal output of the first TTD module are electrically coupled to the interconnect structure. In some embodiments, the interconnect structure includes at least one TTD meander line and at least one of the time delay lines of the first TTD module is electrically coupled to the at least one TTD meander line.

Systems, methods, and apparatus receive a signal from a first wireless device through a first antenna, of a plurality of antennas, the signal including a first segment and a second segment. Responsive to detecting a change in the signal from the first segment to the second segment, embodiments traverse the plurality of antennas to receive the second segment through each of the plurality of antennas. Embodiments determine a plurality of phase samples, each associated with the second segment received through one of the plurality of antennas. Embodiment then use the plurality of phase samples to calculate direction data associated with the first wireless device.

Various aspects of the present disclosure generally relate to wireless communication. A first wireless communication device determines a co-phasing factor between at least two transmit beams transmitted by a second wireless communication device. The co-phasing factor is determined for generation of at least one co-phased beam by the second wireless communication device. The first wireless communication device transmits information to the second wireless communication device identifying the co-phasing factor. Numerous other aspects are provided.

Various aspects of the present disclosure generally relate to wireless communication. A first wireless communication device determines a co-phasing factor between at least two transmit beams transmitted by a second wireless communication device. The co-phasing factor is determined for generation of at least one co-phased beam by the second wireless communication device. The first wireless communication device transmits information to the second wireless communication device identifying the co-phasing factor. Numerous other aspects are provided.

The present disclosure includes systems and techniques relating to multi-antenna coherent combining (MACC) for carrier sensing (CS) and symbol timing (ST) in a wireless communication system. In some implementations, a device includes a receiver and processor electronics. The receiver is configured to receive two or more signals from two or more antennas, each of the two or more signals including a known, periodic reference signal that has gone through a respective wireless channel via one of the two or more antennas. The processor electronics are configured to obtain estimated phases of the two or more signals from the two or more antennas; obtain a combined signal by combining the two or more signals with coherent estimated phases of the two or more signals; and perform carrier sensing and symbol timing of the two or more signals based on the combined signal.

This disclosure provides methods, devices, and systems for a wireless communication device to perform signal phase rotation. In some implementations, the wireless communication device may determine a number of phase rotation parameters to be applied to a number of tones of a transmission signal. In some aspects, each of the phase rotation parameters indicates a phase rotation to be applied to each of the tones according to a carrier index range for each of the tones and a bandwidth mode for the transmission signal. In some implementations, the wireless communication device may apply the phase rotation parameters to respective ones of the tones according to the specified phase rotations and the carrier index ranges, and transmit the transmission signal from the wireless communication device according to the applied phase rotation parameters.

In described examples, a quadrature phase shifter includes digitally programmable phase shifter networks for generating leading and lagging output signals in quadrature. The phase shifter networks include passive components for reactively inducing phase shifts, which need not consume active power. Output currents from the transistors coupled to the phase shifter networks are substantially in quadrature and can be made further accurate by adjusted by a weight function implemented using current steering elements. Example low-loss quadrature phase shifters described herein can be functionally integrated to provide low-power, low-noise up/down mixers, vector modulators and transceiver front-ends for millimeter wavelength (mmwave) communication systems.