A method for indicating a frame structure, a method for updating a frame structure, and related devices are provided. The method for indicating a frame structure, performed by a first device, includes: determining a first frame structure based on user data to be transmitted; and when the first frame structure is different from a second frame structure corresponding to a second device, sending indication information, where the indication information is used to indicate the first frame structure.

A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t), wherein an average transmission power of the 16-QAM modulation signal s2(t) being the same as an average transmission power of the QPSK modulation signal s1(t), and (iv) transmits the transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency.

A method and apparatus are disclosed to reduce MU-MIMO complexity in a receiver. In one embodiment, a method implemented in a network node includes determining a frequency dispersion of a channel for a wireless device (WD); and based at least in part on the determination of the frequency dispersion, determining at least one frequency spacing for at least one weight associated with the channel. In another embodiment, a method implemented in a WD includes transmitting a signal to the network node; and receiving an allocation of at least one time-frequency resource based at least in part on a determination of a frequency dispersion on the transmitted signal, the at least one time-frequency resource being shared between the WD and at least one other WD.

Disclosed is a method for estimating a channel of a terminal by a base station in a wireless communication system supporting multiple antennas, the method comprising the steps of: estimating a moving speed of the terminal on the basis of a first channel value acquired at a current time point and a second channel value acquired at a previous time point; determining, on the basis of the estimated moving speed, a complexity degree corresponding to the number of channel values for multiple time points including the current time point; and estimating a channel of the terminal at a next time point on the basis of the determined complexity degree.

Aspects of the subject disclosure may include, for example, determining a coherence block for each user equipment (UE) of a plurality of UEs being served by the first cell, resulting in a plurality of coherence blocks, responsive to the determining, identifying a smallest coherence block from the plurality of coherence blocks, identifying a pilot sequence length based on the smallest coherence block, determining a plurality of orthogonal pilot sequences based on the identifying the pilot sequence length, designating, from the plurality of orthogonal pilot sequences, a first group of orthogonal pilot sequences for use in the first cell, and distributing, to each neighboring cell of a plurality of neighboring cells adjacent to the first cell, a respective group of orthogonal pilot sequences from a remainder of the plurality of orthogonal pilot sequences, to prevent pilot contamination between the first cell and the plurality of neighboring cells. Other embodiments are disclosed.

An operation method of a terminal using a channel estimation artificial intelligence (AI) model may comprise: receiving, from a base station, information on the channel estimation AI model; performing first channel estimation using the channel estimation AI model by receiving a first signal A from a base station; and receiving, from the base station, data based on the estimated channel.

A wireless communication device includes an estimation observation unit that observes a channel condition by estimating a tendency of a long delay wave and a channel fluctuation from a received signal in which a training signal is added to a data frame, a first equalizer that compensates for the received signal, a second equalizer that compensates for the received signal with a property of having a higher long delay wave tolerance and a lower channel fluctuation tolerance than the first equalizer, and a control unit that performs control which switches such that the first equalizer or the second equalizer performs compensation for the received signal, on the basis of the channel condition observed by the estimation observation unit.

A delay doppler domain transformation can be used to estimate characteristics of a channel between a base station and a user equipment or alternatively, between the user equipment and another user equipment. Thus, the velocity and the distance position of the user equipment can be calculated. For example, a signal received in the time-frequency domain, can be converted to the delay doppler domain by the base station. In response to the conversion, the base station can estimate the velocity of the user equipment. The velocity can be utilized by various applications. For example, the velocity can be utilized to alert the other user equipment to the location or an anticipated location of the user equipment.

A radio communication device that receives signals by using a plurality of reception antennas in a radio communication system employing multi-station simultaneous transmission includes: processing circuitry that estimates channel information on the basis of training symbol sequences, which are different depending on the base-station antennas, included in received signals, and outputs a channel information estimation result; performs a channel matrix extending process of extending dimension of a channel matrix on the basis of the channel information estimation result and a coding rule of the received signals, and extending array's degree of freedom; generates an interference suppression weight by using the channel matrix resulting from the channel matrix extending process; and extends dimension of a received signal vector by using a result of observation over symbol duration time for a plurality of symbols, and multiplies the received signal vector resulting from the extension of dimension by the interference suppression weight.

An electronic device and a method for estimating a channel based on a fading channel in an electronic device are provided. The electronic device includes at least one antenna, a communication circuit, and at least one processor operably coupled with the at least one antenna and the communication circuit, wherein the at least one processor is configured to obtain a channel characteristic of a reception signal received through the at least one antenna, set a weight and a channel estimation interval for channel estimation based on the channel characteristic of the reception signal, estimates a channel of the reception signal by applying the set weight to at least one subcarrier included in the set channel estimation interval among a plurality of subcarriers included in a reference signal included in the reception signal.