A method including receiving, by an antenna combiner of a wireless communication system, a set of Random Access Channel (RACH) sequences of a first RACH signal from a first antenna and a set of RACH sequences of a second RACH signal from a second antenna. The method further including selecting, by the antenna combiner, each RACH sequence of the set of RACH sequences of a selected RACH signal from a selected antenna that has a best Signal to Interference plus Noise Ratio (SINR) from each RACH sequence of the set of RACH sequences of the first RACH signal from the first antenna that has a first SINR and each RACH sequence of the set of RACH sequences of the second RACH signal from the second antenna that has a second SINR.

A method includes: receiving, by a BBU, M groups of signals, where each group of signals includes N signals, M is an integer greater than 0, and N is a maximum quantity of signals supported when a physical cell of the BBU demodulates a signal; determining, by the BBU, H groups of signals that carry data and that are in the M groups of signals, where 0<H≤M; combining, by the BBU, the H groups of signals into one group of data; and demodulating, by the BBU, the combined group of data.

A method of controlling a multi-antenna communication system includes: obtaining a first baseband signal through a first antenna; performing a cross-correlation calculation on the first baseband signal and default information during a period of time, thereby to obtain a plurality of cross-correlation calculation results; calculating energy of the first baseband signal to obtain a first energy value; determining connectivity state of the first antenna according to the first energy value and the cross-correlation calculation results; and controlling a signal processing circuit of the multi-antenna communication system according to the connectivity state of the first antenna.

Examples described herein include examples of wireless communication devices, systems, and methods which may employ multicarrier frequency division duplexing (multicarrier-FDD) techniques. Such techniques may enhance capacity and/or latency of example beamforming and MIMO systems. In some examples, the techniques described herein may be particularly advantageous in fast changing channels. Example channel duplexing techniques and methods described herein may achieve more efficient handling of fast fading channels by space-time adaptive (STAP) and/or adaptive array systems.

A wireless communication device can include an antenna array configured to receive a plurality of radio frequency (RF) signals, RF circuitry, and digital baseband receive circuitry. The RF circuitry is configured to process the plurality of RF signals received via the antenna array to generate a single RF signal. The digital baseband receive circuitry is coupled to the RF circuitry and is configured to generate a downconverted signal based on the single RF signal, amplify the downconverted signal to generate an amplified downconverted signal, and convert the amplified downconverted signal to generate a digital output signal for processing by a wireless modem. The digital baseband receive circuitry further includes at least a first filtering system configured to filter the downconverted signal prior to amplification.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit a request, for an uplink transmission or a downlink transmission, for amplitude modulated phase tracking reference signals; and communicate the uplink transmission or the downlink transmission based at least in part on the request. Numerous other aspects are provided.

A radio-frequency integrated chip (RFIC) is described which provides a number of low noise amplifiers (LNAs) and load circuits. The low noise amplifiers are organized in groups. In some embodiments, a load circuit may be dedicated to a group or shared between groups. The RFIC includes an LNA group including a plurality of LNAs configured to amplify carrier signals related to a plurality of frequency bands, a second LNA group configured to amplify a plurality of second carrier signals, a first load circuit group dedicated to the first LNA group, a second load circuit group dedicated to the second LNA group, and a third load circuit group shared between the first LNA group and the second LNA group. In some embodiments the third load circuit group adaptively performs frequency down-conversion on a carrier signal amplified by at least one of the first LNA group and the second LNA group.

In an embodiment, a wireless device receives configuration parameters of a plurality of uplink (UL) transmission configuration indicator (TCI) codepoints. A first codepoint of the plurality of UL TCI codepoints indicates that an activated downlink (DL) TCI state is applicable for UL signal transmission. A second codepoint of the plurality of UL TCI codepoints indicates that a sounding reference signal resource indicator (SRI) is applicable for UL signal transmission. The wireless device receives a control command indicating a codepoint and determines a spatial domain filter based on the indicated codepoint being one of the plurality of UL TCI codepoints. The spatial domain filter is determined using: the activated DL TCI state based on the indicated codepoint being the first codepoint; and the SRI based on the indicated codepoint being the second codepoint. The wireless device transmits the UL signal using the determined spatial domain filter.

The smart multiband antenna system is used in a communications system having an array of multiple identical antennas configured to operate as a single multiband antenna, such as a phased array. A tunable or variable capacitor, such as a varactor, is integrated between each adjacent pair of antennas in the array to adjust the electrical length or spacing between the antennas in order to optimize antenna performance characteristics, such as beam steering. For a phased array, the tunable capacitor may be adjusted to maintain an antenna spacing of λ/2 between adjacent antennas. The multiband antenna is designed to operate on several bands, and may be used for efficient multiplexing.

The present invention relates to an electronic device and a method for controlling an amplifier on the basis of the state of the electronic device. According to various embodiments of the present invention, the electronic device comprises: a first antenna for transmitting and receiving a wireless signal; a second antenna for receiving the wireless signal and including a low noise amplifier (LNA) for amplifying the received wireless signal; and a processor electrically connected to the first antenna and the second antenna. The processor can be configured to control the LNA of the second antenna to be at least temporarily turned off during transmission of the wireless signal through the first antenna when the electronic device is in a first state. Various embodiments other than the various embodiments disclosed in the present invention are possible.