Resource allocation method of MIMO-OFDMA system

Abstract

The invention discloses a resource allocation method of an MIMO-OFDMA system. In sub-carrier allocation, first, sub-carriers are partitioned into blocks, then, first sub-carrier blocks are allocated to users in sequence, the sub-carrier block with the largest sum of channel gain characteristic values of all the sub-carriers in the sub-carrier block of the users is selected, a simplified user capacity calculation formula is used for obtaining user capacities, the users with the lowest capacity are selected in sequence so that the remaining sub-carrier blocks can be allocated to the users, and the user capacities are updated till allocation is completed; in power allocation, the power of the first user is obtained first, then, the power of other users is obtained through calculation according to parameters such as a fairness factor, and finally the power of all the users is reallocated. According to the resource allocation method of the MIMO-OFDMA system, on the premise that fairness between the users and the limitation of the total power of the system are taken into full consideration, the calculation complexity is reduced while the system capacity can be maximized.

Description

technical field [0001] The invention belongs to the resource allocation technical field of MIMO-OFDMA system, and more specifically, relates to a resource allocation method of MIMO-OFDMA system. Background technique [0002] In the past decade, the need to realize high-speed communication and high-capacity communication has become more and more urgent. Effectively combining OFMDA (Orthogonal Frequency Division Multiple Access) technology and MIMO (Multiple-Input Multiple-Output) technology can solve this problem well. OFDMA technology is a wireless communication access method proposed based on OFDM technology. In future wireless communication systems, OFDMA technology is one of the most promising candidate technologies, because OFDMA technology can easily obtain high transmission rates and With flexible resource allocation. The use of MIMO technology can bring diversity gain and multiplexing gain, so that the capacity of the MIMO-OFDMA system can be greatly improved. For ...

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Problems solved by technology

[0003] In the literature G.Li, and H.Liu, "On the Optimality of Downlink OFDMA MIMO Systems," in Proc.Signals, Systems and Computers Conf, vol.1, Nov.2004, PP.324-328. In, the author proposed Two sub-optimal algorithm standards are proposed, which can reduce the computational complexity of the system well when used in the subcarrier allocation algorithm, but this strategy does not consider the fairness among users

In the paper Z.Shen, J.G.Andrews, and B.L.Evans, "Adaptive Resource Allocation in Multiuser OFDM Systems With Proportional Rate Constraints," IEEE Trans.wireless, the authors considered fairness among users and divided system resource allocation into power allocation and sub- Carrier allocation is used to reduce the computational complexity of the system, but this document only considers the case of multi-user SISO-OFDM system

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