Method for SM (save mode) users to receive multi-user MIMO (multiple input multiple output) data in SDMA (space divide multiple access) system
A multi-user and user technology, applied in transmission systems, digital transmission systems, diversity/multi-antenna systems, etc., can solve the problems of sending multi-user data, not being able to use multi-user MIMO gain, and only receiving one data stream, etc., to achieve The effect of improving performance and improving system throughput
Active Publication Date: 2014-07-02
SOUTHEAST UNIV
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Problems solved by technology
The AP cannot send multi-user data for users in the SM state, and needs additional time to send data for them alone. This approach cannot take advantage of the gains brought by multi-user MIMO technology, reduces transmission efficiency, and is not conducive to improving system throughput.
[0005] In addition, users in dynamic SM power saving usually only open one receiving link. Since a receiving link can only receive one data stream at most, even if the AP can send multi-user data for it, the user can only Can receive a data stream, when the amount of data is large, it cannot meet the user's business needs
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[0018] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail by giving specific embodiments and referring to the accompanying drawings.
[0019] In order to enable the SM user to obtain the gain of receiving multi-user MIMO data, in the SM power control frame sent by the SM user to the AP in the method of the present invention, the number information corresponding to the opening of the receiving link (such as image 3 shown in figure 2 Based on the frame structure of the existing SM power control frame shown above, the active link number field is added), and the access point obtains the accurate channel corresponding to the activated receiving link from all channel information of the user according to this number. The AP uses this channel information and the channel information of other users to design a multi-user precoding matrix, and then sends the multi-user MIMO data c...
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The invention discloses a method for SM (save mode) users to receive multi-user MIMO (multiple input multiple output) data in an SDMA (space divide multiple access) system. The method includes that: SM power control frames in a save mode are sent to an access point by the SM users while receiving link serial numbers invoked in a save mode are fed back to the access point; a multi-user pre-coding matrix is designed at the access point according to channel state information corresponding to the receiving link serial numbers invoked by the SM users; multi-user MIMO data including SM users data are sent; and required data are demodulated by the SM users by the aid of the invoked receiving link. The method has the advantages that the multi-user MIMO gains can be acquired, the system throughput can be increased, and the performance of the SDMA system can be improved.
Description
technical field [0001] The invention relates to a method for solving the problem of SM (save mode, save mode) users receiving multi-user MIMO (multiple input multiple output) data. Background technique [0002] In a multi-antenna broadcast channel, space resources can be used to send data to multiple user terminals at the same time. This technology is called multi-user MIMO, that is, SDMA (space divide multiple access). Compared with traditional time division Multiple access (TDMA) access, which can double the system throughput. At present, in SDMA, the common method of allocating space resources is to adopt multi-user precoding technology, such as zero-breaking (ZF) multi-user precoding technology, minimum mean square error (MMSE) multi-user precoding technology or multi-user precoding technology based on generalized eigenvalues. User precoding technology and iterative precoding technology, etc. These technologies can obtain better performance when allocating space resourc...
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IPC IPC(8): H04L1/00H04L1/06H04B7/06
CPCY02D30/70
Inventor 黄永明李浩何世文杨绿溪
Owner SOUTHEAST UNIV