Optimal frame length selection method of downlink communication of multi-user MIMO system
An optimal frame, multi-user technology, applied in diversity/multi-antenna systems, wireless communication, space transmit diversity and other directions, can solve the problems of multi-system resources, the inability of the scheduler to follow well, and the loss of multi-user diversity. Guaranteed effect of delay requirements
Inactive Publication Date: 2014-08-20
SOUTHEAST UNIV
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Problems solved by technology
On the one hand, a shorter frame length enables the scheduler to better explore multi-user diversity, but the relatively large proportion of control information in a short frame will consume more system resources, resulting in a decrease in system throughput
On the other hand, a longer system frame length can improve system throughput, but for channels that change rapidly in a multi-antenna broadcast system, a longer system frame length will make the scheduler unable to follow channel changes well , resulting in the loss of multi-user diversity
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[0011] A method for selecting an optimal frame length for downlink communication in a multi-user MIMO system, the method comprising steps: each user feeds back its maximum delay default probability constraint to a central control node; the central control node combines the statistical channel state information of each user with the The feedback demand information is for each user to calculate the required optimal frame length; the central control node selects the maximum frame length from the aforementioned optimal frame length set as the optimal frame length of the system.
[0012] The optimal frame length selection method utilizes concepts such as effective bandwidth and effective capacity, and converts the user maximum delay default probability constraint into a constraint including frame length and user average rate, and calculates the user average rate through user statistical channel state information, thereby Get the optimal frame length.
[0013] The system optimal fra...
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The invention provides an optimal frame length selection method of downlink communication of a multi-user MIMO system. The largest time delay default probability constraints of all users in the system are fed back to a central control node; according to the statistic channel state information of all the users and the demand information fed back by all the users, the optimal frame lengths required by all the users are calculated by the central control node on the premise that the largest time delay default probability constraints are guaranteed; the largest frame length is selected from the optical frame length set by the central control node to be used as the optimal frame length of the system. Through the method, the relations between the largest time delay default probability constraints of the users and the frame length of the system as well as between the largest time delay default probability constraints of the users and the average rate of the users can be quantitatively reflected, and the selected optimal frame length of the system can effectively guarantee the time delay demands of all the users.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an optimal frame length selection method for downlink communication of a multi-user MIMO system. Background technique [0002] In the key technology research of multi-antenna broadcasting systems, how to select the optimal frame length for data transmission is one of the key points, and the optimal frame length selection can effectively deal with burst data services and ensure the delay requirements of each user , so as to further improve the throughput of the system. [0003] The system frame length in a multi-antenna broadcast system has a non-negligible impact on the effective throughput of the system. On the one hand, a shorter frame length enables the scheduler to better explore multi-user diversity, but the relatively large proportion of control information in a short frame will consume more system resources, resulting in a decrease in system thr...
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IPC IPC(8): H04W28/18H04W28/22H04B7/04
Inventor 沈连丰李俊超夏玮玮谭雨凤刘诚毅陈赓鲍楠张瑞
Owner SOUTHEAST UNIV