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 object of the present invention is to provide effective technique to inform a subscriber who is a member of a communication service of ISDN about an activated communication service accurately. The present invention relates to the method and system in which the switching system provided to control communication with each ISDN subscriber terminal and where character string showing the names of communication services are stored, writes a character string showing the names of communication service activated for a subscriber terminal to a call setup request acknowledgment signal to be sent in response to a call setup request signal from the subscriber terminal.

Signal transmission method and device

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

Codebook generation method of MIMO (Multiple-Input Multiple-output) system

The invention discloses a method, device and system for providing and obtaining a pre-encoding matrix of a shaped beam. The method comprises a step of carrying out channel estimation when a detecting pilot signal sent by a central access point is received and obtaining a multipath channel gain matrix H, a step of carrying out matrix SVD on the matrix H by adopting a set matrix decomposition method to obtain the pre-encoding matrix V meeting the preset conditions, wherein the matrix V meeting the preset conditions is a matrix V with the selected part elements same or conjugated, the other part elements same or the real part symbols contrary, and a step of extracting one element from the selected part elements, extracting one element from the other part elements, packaging the extracted elements in a matrix V data package and providing the extracted elements for the central access point. The amount of transmitted information is reduced, the occupied system resources are reduced, and the performance of the system is improved.

Method, device and system for providing and obtaining pre-encoding matrix of shaped beam

Transmission method for precoding based on non-codebook in time-varying MIMO system

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Transmission method for precoding based on non-codebook in time-varying MIMO system