A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. Spatial channel state information is measured at receiving equipment and then decomposed into components. The components are then quantized using codebook(s) and fed back as multiple indices to transmitting equipment.

Method and system for spatial channel state information feedback based on a kronecker product

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

A method for determining a precoding matrix indicator, user equipment, and a base station are disclosed in embodiments of the present invention. The method includes: receiving a first reference signal set sent by a base station, where the first reference signal set is associated with a user equipment-specific matrix or matrix set; selecting a precoding matrix based on the first reference signal set, where the precoding matrix is a function of the user equipment-specific matrix or matrix set; and sending a precoding matrix indicator to the base station, where the precoding matrix indicator corresponds to the selected precoding matrix. In the embodiments of the present invention, CSI feedback precision can be improved without excessively increasing feedback overhead, thereby improving system performance.

Method for determining precoding matrix indicator, user equipment, and base station

The present application relates to the technical field of radio communications, and relates specifically to a method, system, and device for transmitting coding instruction information and for determining a pre-coding matrix, for use in solving the problem that direct application of current codebooks to a three-dimensional beamforming/pre-coding technology causes performance degradation. The method of embodiments of the present application comprises: a user equipment determines and transmits first pre-coding instruction information, second pre-coding instruction information, and third pre-coding instruction information, where the first pre-coding instruction information, the second pre-coding instruction information, and the third pre-coding instruction information correspond to a pre-coding matrix, a first component pre-coding matrix is a block diagonal matrix, a third component pre-coding matrix is constituted by a weighted column selection vector, and, with the exception of a P-number of nonzero elements, the remainder of the weighted column selection vector is all zeros. Employment of the solution of the embodiments of the present application increases the performance of the three-dimensional beamforming/pre-coding technology.

Method, system, and device for transmitting coding instruction information and for determining pre-coding matrix

A system and method for multiple point transmission in a communications system are provided. A method for multiple point transmission operation comprises modifying a configuration of a radio bearer for use in a multiple point transmission to a user equipment according to operating condition information of the user equipment, reconfiguring the radio bearer according to the modified configuration, and initiating a multiple point transmission to the user equipment using the reconfigured radio bearer.

System and Method for Multiple Point Transmission in a Communications System

The invention provides a pre-coding method for an MIMO (multi-input multi-output) system of 8 transmitting antennas. A dual code text is adopted in the method, and the dual code text is determined by selectively succeeding partial code words of LTE (long term evolution) and then performing certain extension. The method for pre-coding by using the dual code text reduces the feedback overhead of the system, acquires good performance gain, and is suitable for a multi-user multi-input multi-output (MU-MIMO) system.

Pre-coding method for MIMO system of 8 transmitting antennas

The invention relates to an adaptive automatic repeat request method, belonging to the wireless communication technology, which aims to combine channel coding with space-time coding, adjust the transmission modes adaptively, reduce repeat times effectively and improve the spectrum efficiency of the system. The invention is characterized in that a sending end is connected with a receiving end via a transmission link; the sending end has a plurality of transmission modes; a corresponding table of the transmission modes is formed; each transmission mode has a certain range of transmission times;a mode transmission graph of the transmission modes is formed. The invention has the advantages of adjusting channel coding mode, modulation mode and space-time coding mode via adjusting the transmission modes adaptively, reducing repeat times effectively, improving the channel utilization and the spectrum efficiency, reducing the implementation complexity and improving the performance of the system via ACK or NACK feedback choosing transmission modes flexibly when the slow channel is fading.

Self-adaptive mixture automatic request retransmission method

The invention discloses a self-adapting fountain code multicast transmission system based on modulation, which comprises a base station and a plurality of user sides. The base station comprises a base station data memory, a fountain coder, a user classification processor, a superposition coder, a modulator, a base station duplex transceiver and a feedback information processing module; and each user side comprises a terminal duplex transceiver, a serial interference cancellation decoder, a terminal data memory, a fountain decoder and a feedback generator. In a correcting and deleting channel, a mode of digital fountain codes is adopted for transmission so as to reduce the feedback in a multicast environment and improve the throughput rate of the system. According to a multi-user channel state, modulation modes are self-adaptively switched and selected. When the performance difference among the users is small, a common modulation mode is adopted; and when the performance difference among the users is large, superposition coding for different user information is carried out through power distribution so that the system still can keep good transmission performance. The combination of the digital fountain code and the superposition coding exerts the advantages of the digital fountain code and improves the performances.

Self-adapting fountain code multicast transmission system based on modulation

The invention provides a multi-input and multi-output (MIMO) transmission method as well as the system thereof. In the method, a transmitting end transmits the information estimated by a signal path, each receiving end generates random beam shaping feedback information and sends out the random beam shaping feedback information to the transmitting end, and the transmitting end carries out user preselection to generate an alternative scheduling user collection, which is sent to each receiving end; each receiving end carries out feedback judgement, if the feedback is allowed, zero forcing beam shaping feedback information is generated, and is sent to the transmitting end; the transmitting end carries out user scheduling to obtain scheduling users, and transmits user data to the scheduling users. The invention has the advantages of the random beam shaping feedback information and the zero forcing beam shaping feedback information at the same time, reduces the feedback spending of the system and the complexity of the implementation, and improves the system capacity.

Method and system of MIMO transmission

A method for reducing delay in multiple base station cooperation belongs to the methods of multiple base station cooperation in the third generation mobile communication long-term evolution project, solving the problem of too large delay in multiple base station cooperation and reducing waiting delay of cooperative users. The method comprises the steps of transmitting by base stations, data sending, judging, positive acknowledgement, negative acknowledgement, retransmitting and failure treating. By arranging the automatic retransmission request protocol following the general packet radio service tunnel protocol, the method realizes consistency of the data on the packet data convergence protocol (PDCP) layer; when receiving the cooperative user data from the service gateway, a service base station transmits the data to a cooperative base station on the PDCP layer; and compared with the existing methods, in the method of the invention, the wire delay of transmitting the retransmitted data from the service base station to the cooperative base station is contained in the radio resource distribution process delay, thereby reducing the sending delay of the retransmitted data of the cooperative user.

Method for reducing delay in multiple base station cooperation

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