Downlink signal transmission system, method and related device
A signal and sending technology, which is applied in the field of mobile terminal equipment and a downlink signal sending device, can solve problems such as lack of reciprocity and inability to realize coordinated transmission of downlink signals
Active Publication Date: 2011-07-20
CHINA MOBILE COMM GRP CO LTD
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[0007] The embodiment of the present invention provides a system for transmitting downlink signals, which is used to solve the problem that the coordinated transmission of downlink signals cannot be realized in the communication system without reciprocity in the prior art
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[0082] For simplicity, it is assumed that there are two users in the current system, user A and user B respectively, the serving base station of user A is base station 1, the serving base station of user B is base station 2, and the cooperative base station of user A and user B is base station 1 , base station 2, attached Figure 7 A schematic diagram of the system. with H A1 Represents the downlink channel impulse response matrix between base station 1 and user A, similarly there is the downlink channel impulse response matrix H between base station 2 and user A A2 , the downlink channel impulse response matrix H between base station 1 and user B B1 , and the downlink channel impulse response matrix H between base station 2 and user B B2 .
[0083] User A determines H from the downlink common pilot signals of base station 1 and base station 2 detected from the received superposition A1 、H A2 , according to H A1 Select the optimal codebook matrix T 1 (The corresponding...
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The invention discloses a downlink signal transmission system, a downlink signal transmission method and a related downlink signal transmission device, which are used for solving the problem that a communication system without reciprocity in the prior art cannot realize the cooperative transmission of downlink signals. The system comprises mobile terminals, a joint processing device and cooperative base stations, wherein the mobile terminal is used for determining a downlink channel matrix corresponding to each cooperative base station, selecting an optimal codebook matrix, and compressing the downlink channel matrix corresponding to each cooperative base station according to the selected optimal codebook matrix and the downlink channel matrix of a serving base station; the joint processing device is used for determining an equivalent downlink channel matrix corresponding to the mobile terminal according to an identifier of the compressed downlink channel matrix corresponding to each cooperative base station, the identifier of the selected optimal codebook matrix and the identifiers of the optimal codebook matrixes transmitted by the other mobile terminals, and determining a pre-weighted value corresponding to the mobile terminal based on the equivalent downlink channel matrix; and the cooperative base station is used for transmitting the pre-weighted downlink signal to the mobile terminal according to the pre-weighted value.
Description
technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a downlink signal transmission system, a downlink signal transmission method, a method for compressing a downlink channel matrix, a mobile terminal device and a downlink signal transmission device . Background technique [0002] According to current research on 3GPP LTE (Long Term Evolution), an Orthogonal Frequency Division Multiple Access (OFDMA, Orthogonal Frequency Division Multiple Access) access method will be used in an LTE-Advanced system. With this access method, within the coverage of the same cell, the subcarriers carrying signals of different users are orthogonal to each other, so multiple access interference between signals of different users in the same cell can be avoided. However, the OFDMA access method cannot suppress the interference between signals of users belonging to different cell coverage areas, so in the LTE-Advanced system, the int...
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IPC IPC(8): H04L1/06H04L1/00
Inventor 王启星刘建军金婧史志华刘光毅
Owner CHINA MOBILE COMM GRP CO LTD