Effective capacity-based optimization method for energy efficiency of MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing) system
A technology of MIMO-OFDM and effective capacity, applied in the field of wireless communication, can solve problems such as difficult to obtain energy efficiency indicators
Active Publication Date: 2013-04-17
HUAZHONG UNIV OF SCI & TECH
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However, existing MIMO-OFDM energy efficiency optimization schemes rarely measure system energy efficiency based on system-level actual output while taking into account system QoS requirements, so it is difficult to obtain scientific energy efficiency indicators
In addition, how to find an efficient power allocation optimization scheme based on the statistical characteristics of sub-channels is another challenge faced by current research on communication resource allocation.
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0036] Such as figure 1 As shown, consider an M r × M t MIMO-OFDM system with antenna array and N orthogonal subcarriers, M t is the number of transmitting antennas, M r is the number of receiving antennas. h k is the frequency domain channel matrix on the kth subcarrier, C is a complex number space. For a MIMO system, the data flow is equivalent to passing through M(M=min(M t ,M r )) parallel singular value channels for transmission. That is, for the channel matrix H k Singular value decomposition is performed to decompose the MIMO channel on each orthogonal subcarrier into M parallel ...
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The invention discloses an effective capacity-based optimization method for the energy efficiency of an MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing) system. The method comprises the following steps of: carrying out singular value decomposition on frequency domain channel matrixes on each carrier wave in the MIMO-OFDM system to totally obtain MN concurrent space-frequency sub-channels, grouping the obtained MN space-frequency sub-channels, computing the optimized effective capacity of each set of sub-channels, and computing the optimized energy efficiency Eta opt of the MIMO-OFDM system according to the optimized effective capacity Ce(theta)opt_i. According to the optimization method, the energy efficiency of the system is optimized into a target, the singular value decomposition is carried out on the frequency domain channel matrixes on each carrier wave in the system for obtaining the concurrent space-frequency sub-channels, grouping the sub-channels, obtaining the power of each set of the sub-channels according to a marginal probability density function of each set of the sub-channels, and distributing a threshold value of optimal solution to optimize the effective capacity of each set of the sub-channels, so that the effective capacity of the whole system can be maximized.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to an energy efficiency optimization method for an MIMO-OFDM system based on effective capacity. Background technique [0002] MIMO-OFDM technology is a new technology obtained by combining MIMO and OFDM technology. MIMO technology can generate independent parallel channels in space and transmit multiple data streams, increase spectral efficiency without increasing system bandwidth, and effectively improve system transmission rate. However, OFDM reduces the influence of multipath fading by converting the frequency selective multipath fading channel into a flat channel in the frequency domain. In this way, combining the two technologies of MIMO and OFDM can achieve two effects, one is to achieve a high data transmission rate, and the other is to achieve strong reliability through diversity. [0003] A key technology in system-level mobile communicatio...
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IPC IPC(8): H04L27/26
Inventor 葛晓虎王玉明黄曦张靖韩涛潘胜倪大建
Owner HUAZHONG UNIV OF SCI & TECH