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Method for optimizing downlink OFDMA cellular system

An optimization method and technology of a cellular system, applied in the field of optimization of downlink OFDMA cellular systems, can solve problems such as inability to apply OFDMA systems, without using relays to improve system throughput and fairness, etc.

Inactive Publication Date: 2010-05-05
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In "Opportunistic Relaying in Cellular Network for Capacity and Fairness Improvement" (Proceeding of IEEE GLOBECOM'07, 26-30 Page(s): 4407-4412), Seungho Song et al proposed that in a cellular network, an opportunistic relay method is used to Improve system capacity and fairness, but this method is mainly aimed at TDMA systems and cannot be applied to OFDMA systems
At present, in the downlink OFDMA cellular system, there is no resource allocation method that uses relay to improve system throughput and fairness

Method used

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  • Method for optimizing downlink OFDMA cellular system
  • Method for optimizing downlink OFDMA cellular system
  • Method for optimizing downlink OFDMA cellular system

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Embodiment Construction

[0054] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0055] Such as figure 1 As shown, the implementation environment of this embodiment includes: in the downlink of an OFDMA cellular system with a relay, where BS means a base station, UE means a user terminal, and R means a set relay node.

[0056] This embodiment is specifically realized through the following steps:

[0057] Step 1: collect direct transmission channel gain and relay channel gain respectively;

[0058] The direct transmission channel gain refers to: the channel gain of each subcarrier between the base station and each user Among them: k∈K represents the user number, n∈N represents the subcarrier...

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Abstract

The invention is a method for optimizing a downlink OFDMA cellular system, belonging to the technical field of wireless communication and comprising the steps as follows: respectively collecting direct channel gain and relay channel gain; distributing subcarriers to all users equally, determining a direct mode or a relay mode corresponding to each subcarrier, and determining the relay number of the corresponding subcarrier when the subcarrier adopts the relay mode; and distributing downlink transmitted power to all users respectively and distributing transmitted power for each subcarrier. The invention takes that the minimum velocity of all users is maximized by a base station as an aim, and distributes subcarriers to all users; each subcarrier distributed to a user preferentially selects a relay link according to the channel gains and is compared with a direct link to determine which transmission mode is adopted. Finally, total transmission power is distributed to relay and all subcarriers according to a certain way to improve the throughput of the system.

Description

technical field [0001] The invention relates to an optimization method in the technical field of wireless communication, in particular to an optimization method for a downlink OFDMA cellular system. Background technique [0002] Today's wireless communication is developing extremely rapidly, the number of users of various wireless services is increasing, and the requirements for the throughput and stability of wireless communication are also getting higher and higher. At present, the main challenge facing wireless communication is still whether wireless services can provide high-speed and high-performance services. People use Orthogonal Frequency Division Multiplexing (OFDM) technology to overcome the multipath interference of wireless channels. (MIMO) technology to increase the capacity of the wireless channel, so how to improve the data throughput of the wireless cell on the basis of ensuring the quality of service (QoS) has become an important index to measure the perform...

Claims

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Application Information

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IPC IPC(8): H04W52/14H04W52/46H04W72/04
Inventor 郭佳吴幼龙林意如罗汉文俞晖
Owner SHANGHAI JIAO TONG UNIV
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