The present invention discloses a multi-user (MU) transmission method for a multiple input multiple output (MIMO) transmission system comprising a first station and a plurality of second stations. The MU transmission method includes the step of the first station performing simultaneous transmission to a first group of stations of the plurality of second stations in a first transmission interval.

Multi-user Transmission Method, Multiple Input Multiple Output Transmission System Using the Same, Scheduling Method and Access Point Using the Same

Methods and apparatuses for transmitting coding indication information and determining a precoding matrix, for use in resolving the problem that the resolution of code words in a codebook generated by using a combination of a beam vector subgroup and column selection cannot be flexibly adjusted. The method comprises: determining first precoding indication information and second precoding indication information, the first precoding indication information corresponding to a first-stage precoding matrix, the second precoding indication information corresponding to a direction weighting vector and a phase adjustment factor, the direction weighting vector being used for performing interpolation processing on parts representing angles corresponding to beam vectors in the all beam vectors in each polarization direction in the first-stage precoding matrix, the phase adjusting factor being used for performing phase adjustment on different polarization directions of the first-stage precoding matrix, and the first-stage precoding matrix, the direction weighting vector, and the phase adjustment factor being used for generating a precoding matrix. The resolution of a precoding matrix is flexibly adjusted by using a direction weighting vector.

Methods and apparatuses for transmitting coding indication information and determining precoding matrix

The embodiment of the invention provides a precoding method comprising the following steps: a pilot signal transmitted by a transmitting end is received; channel state information estimation is performed according to the pilot signal to acquire a channel mean and a channel covariance; a precoding matrix is calculated according to the channel mean and the channel covariance; and the transmitting end precodes a data signal needing to be transmitted according to the precoding matrix, and the receiving end de-precodes a received precoded signal according to the precoding matrix. Better MIMO precoding reliability performance and higher MIMO system capacity can be obtained for MIMO-OFDM precoding based on the average signal to interference and noise ratio criterion under the condition of channel state information statistics, and reliability performance and MIMO system capacity better than those of codebook-based precoding can be obtained in a low-correlation environment.

Precoding method and device

The invention relates to a transmission method of non-codebook pre-coding in a long term evolution-advanced (LTE-A) system, which belongs to the field of wireless mobile communications. The method comprises the following steps that: a terminal utilizes the obtained channel information to perform geometric mean decomposition to obtain a pre-coding matrix and complete the pre-coding of sent signals; in a base station, a unitary matrix Q and an upper triangular matrix R can be obtained by calculation and then a quick response (QR) decomposition based particle in cell (PIC) algorithm is adopted to perform the multi-input and multi-output (MIMO) detection and decoding of received signals, and then channel sub-space tracking technology is used, and the signals are pre-coded by the unitary matrix Q and then are sent to the terminal; and at the terminal, a unitary matrix P can be obtained by calculation in the same method, and the received signals are detected by the unitary matrix P and simultaneously are pre-coded. In the method, the algorithm has low complexity, and the feedback codebook sequence number occupies less channel resources, so that the channel utilization can be improved, the interference of the front layer sub-channel to a certain sub-channel signal can be eliminated without amplifying noise, and further, the error propagation effect is effectively reduced.

Transmission method of non-codebook pre-coding in long term evolution-advanced (LTE-A) system

The invention provides a non-codebook-precoding-based transmission method for a multi-input multi-output (MIMO) system, which comprises the following steps that: a transmitting end acquires the channel information of the previous time by using feedback or specific channel reciprocity of a time division duplexing (TDD) system, acquires a unitary matrix Q and a lower triangular matrix L in which elements on a diagonal are arranged in a descending order of the probability by performing sequential LQ decoding (SLQD) operation on the channel information, and then finishes precoding of transmission signals and a pilot frequency; the receiving end performs channel estimation on the pilot frequency signal which finishes precoding, acquires the lower triangular matrix L in which elements on a diagonal are arranged in a descending order of the probability, which is obtained after the transmitting end performs the SLQD, processes the received signal by a successive interference cancellation (SIC) technology, eliminates interference of some layer of sub-channel signals from the front layers of sub-channels, and finishes data stream detection of each sub-channel layer by layer. According to the technical scheme of the invention, the MIMO sub-channel detection performance of the receiving end is efficiently improved and the complexity of the processing operation of the receiving end is reduced.

Non-codebook-precoding-based transmission method for multi-input multi-output (MIMO) system

The invention discloses a method for feeding back channel state information in a multi-user multi-input multi-output system, which comprises that when a base station uses identical time-frequency resource to transmit data to N user equipment (UE), in each predefined time window, the base station real-timely monitors NACK information number fed back by UE, and determines number of downlink time slot producing error of transmission according to the NACK information number, when the number of downlink time slot is larger than a predefined threshold, notifies current UE to be scheduled to upload channel state information, shuts down current time window and starts a new time window, the UE to be scheduled feed back the channel state information to the base station according to received notification.

Method for feeding back channel state information in a multi-user multi-input multi-output system

Transmission method based on non-codebook precoding in time-varying channel

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Method for feeding back channel state information in a multi-user multi-input multi-output system

Transmission method based on non-codebook precoding in time-varying channel