MIMO (Multi-Input Multi-Output) power distribution method and system based on MRT (max ratio transmission) precoding
An allocation method and precoding technology, applied in transmission systems, radio transmission systems, transmission monitoring, etc., can solve problems such as waste of system communication resources, difficulty in maintaining channel reciprocity, unreasonable allocation of communication system resources, etc., and achieve improved Rationality, the effect of saving communication resources
Active Publication Date: 2017-06-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
Therefore, random changes in the RF circuit of the transceiver will cause the uplink and downlink signals to be difficult to maintain the reciprocity of the channel even if they are in the same frequency band.
Therefore, in the prior art, directly configuring the downlink power according to the uplink signal model will cause unreasonable allocation of communication system resources, resulting in waste of system communication resources
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] In the actual MIMO communication system, it includes not only the wireless propagation channel, but also the RF circuit part of the transceiver at both ends of the link. Usually, the gain of the RF circuit of the transceiver is changed due to the influence of the external environment, such as temperature and humidity, on the transceiver circuit of the RF circuit. This makes it impossible to satisfy the reciprocity of the channel even if the uplink chann...
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Embodiments of the invention provide an MIMO power distribution method and system based on MRT precoding. The method comprises: obtaining the amplitudes and phases of radiofrequency circuit gains of a terminal and a base station of an MIMO system of the MRT precoding and determining an uplink channel model and a downlink channel model; according to the uplink channel model and the downlink channel model, determining an approximate sum rate; according to the approximate sum rate, establishing a non-convexity optimal function by talking maximization of the approximate sum rate as an objective; by a formula that converts the function to convexity from non-convexity, converting the non-convexity optimal function to a convexity optimal function; and when the approximate sum rate is maximal, determining an optimal solution of the convexity optimal function, and configuring downlink power of the MIMO system according to the optimal solution. By the MIMO power distribution method based on the MRT precoding, reasonability of resource configuration of a communication system is improved, and communication resources of the system are saved.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a MIMO power allocation method and system based on maximum ratio transmission precoding. Background technique [0002] Compared with the single-antenna system, the MIMO (Multiple-Input Multiple-Output) system has superior performance such as diversity and multiplexing gain, higher rate and reliability, and is considered as a kind of cellular communication system. important technology. In recent years, the massive MIMO system, that is, the base station installs a large number of antennas, and the number of antennas is increased to several hundred to serve dozens of users at the same time, so as to obtain higher speed and reliability. Massive MIMO system is considered to be an important key technology of 5G communication system. [0003] The base station uses downlink CSI (Channel State Information, channel state information) to perform precoding to better ...
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Login to View More IPC IPC(8): H04W72/04H04B7/0456H04B17/391
CPCH04B7/0456H04B17/391H04W72/0473H04W72/23Y02D30/70
Inventor 王莹王心水孙瑞锦孟萨出拉
Owner BEIJING UNIV OF POSTS & TELECOMM