Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system

A MIMO-OFDMA, distributed resource technology, applied in the field of wireless communication, can solve problems such as frequency selective fading, and achieve the effect of reducing the amount of calculation

Inactive Publication Date: 2013-07-24
SOUTHEAST UNIV
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Problems solved by technology

[0002] MIMO multi-antenna technology turns the multipath effect that originally caused interference into benefits. It can not only obtain spatial multip

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  • Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system
  • Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system
  • Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system

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Embodiment Construction

[0013] The distributed resource allocation method of the MIMO-OFDMA wireless relay system proposed by the present invention is described in detail as follows with reference to the accompanying drawings.

[0014] The MIMO-OFDMA wireless relay system to which the present invention is applicable is as figure 1 As shown, the system has a base station, and M relays are evenly deployed at the cell edge of the base station, and are respectively responsible for several user terminals in their respective sectors. All K users access the system in OFDMA multiple access mode, and can communicate only through relay assistance, and some of them are delay-sensitive users (k∈D m ), the rest are non-delay-sensitive users (D m Denotes the delay-sensitive user set, U m represents the entire set of users). The system contains n F subcarriers, and each entity uses N antennas to transmit and receive signals.

[0015] The present invention dynamically selects the following relay forwarding ...

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Abstract

The invention discloses a distributed resource distribution method for a multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system. The method comprises the following steps of: (1) initializing parameters of the MIMO-OFDMA wireless relay system; (2) sequentially calculating values of user terminals within a charge range of a relay node according to channel state information and lagrangian multipliers set by a base station, and sending calculation results of sub-carrier distribution values, equivalent system power distribution values and time delay sensitive user throughput capacity to the base station; (3) feeding back a new lagrangian multiplier result to the relay node through the base station; and (4) judging whether the sub-carrier distribution values and the power distribution values are converged or not by the relay node, and finally obtaining a final resource distribution result. According to the method, based on a multi-user and multi-carrier-system dual optimization theory and weights of multiple users, power and sub-carrier sources can be rational distributed by a rate adaptive distributed algorithm; and the calculation amount of the base station can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a distributed resource allocation method of a MIMO-OFDMA wireless relay system. Background technique [0002] MIMO multi-antenna technology turns the multipath effect that originally caused interference into benefits. It can not only obtain spatial multiplexing gain, thereby improving channel capacity, but also obtain spatial diversity gain, thereby improving channel reliability. Sexual decline is powerless. OFDMA technology can not only use the orthogonality of spectrum to improve spectrum utilization, but also bring multi-user diversity gain, and effectively combat frequency selective fading, cell interference and symbol interference. In addition, the LTE-A standard has explicitly adopted wireless relay technology to expand network coverage, reduce device power consumption, increase system capacity, and balance network loads. Since the performance g...

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Application Information

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IPC IPC(8): H04L5/00
CPCH04B7/0413H04W72/04H04W84/047Y02D30/70
Inventor 刘畅王江舟王向阳
Owner SOUTHEAST UNIV
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