Resource allocation method of MIMO-OFDMA system

A MIMO-OFDMA, resource allocation technology, applied in the directions of allocation standards, transmission systems, payload allocation, etc., can solve problems such as only considering but not considering fairness among users

Inactive Publication Date: 2015-01-07
UNIV OF SCI & TECH BEIJING
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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
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[0151]In order to illustrate the technical effect of the present invention, an experiment simulation is carried out on the resource allocation method of the MIMO-OFDMA system proposed by the present invention. In the simulation, six Rayleigh multipath models are used to form a frequency-selective channel. In the simulation system, the number of transmitting antennas of the base station is 2, the number of receiving antennas of each user is 2, and the number of users is 5. The maximum power of the system is 2W, and the available bandwidth of the system is 2MHz and is divided into 128 sub-channels (carriers). The number of subcarriers in each subcarrier block is 4, therefore, the number of subcarrier blocks is n=128 / 4=32. The fairness factor of each user is γ 1 =1,γ 2 =2,γ 3 =4,γ 4 =8,γ 5 =16.

[0152] Figure 4 It is a comparison curve of spectrum efficiency between the present invention and the traditional algorithm under different carrier-to-noise ratios. As shown in...

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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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Application Information

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IPC IPC(8): H04L5/00H04W72/08
CPCH04L5/0044H04L5/006
Inventor 刘健林孟渊张唯炯朱彦志
Owner UNIV OF SCI & TECH BEIJING
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