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Method and apparatus for distributing carrier of OFDM access system

An access system and orthogonal frequency division technology, which is applied in the field of carrier allocation in OFDM access systems, can solve the problem of pilot frequency occupying carrier resources, etc., and achieve the effect of improving transmission rate and saving carrier resources

Inactive Publication Date: 2009-07-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pilots also occupy carrier resources, and the subcarriers configured with pilots will no longer carry valid data. Therefore, the improvement of channel estimation effect is often at the cost of carrier overhead.

Method used

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  • Method and apparatus for distributing carrier of OFDM access system
  • Method and apparatus for distributing carrier of OFDM access system
  • Method and apparatus for distributing carrier of OFDM access system

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Embodiment Construction

[0027] The core idea of ​​the present invention is that although the configuration of the pilot frequency is beneficial to user channel estimation, improves the channel estimation effect, and is beneficial to data reception, the use of the pilot frequency also occupies valuable subcarrier resources. For mobile systems, the proportion of high-speed mobile users is quite limited. In most cases, the user's channel quality is relatively high, and more pilot configurations are not particularly helpful for channel estimation. In view of this situation, the present invention first determines the user's downlink channel quality, and allocates pilotless downlink dedicated subcarriers to users whose downlink channel quality reaches a set threshold, so that all the dedicated subcarriers carry user data. The invention is simple to implement and saves the carrier resource of the system on the premise that the user communication effect is not affected. The present invention will be described in...

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Abstract

The invention discloses a method for carrier distribution in an orthogonal frequency division multiplexing access system, which relates to the technology of carrier distribution in an OFDMA system and aims at solving the problem that the carrier distribution of part of the current users is not reasonable. The technical proposal is as follows: users where the down channel quality of each sector reaches threshold are determined; down private subchannels are distributed for the determined users; and the down private subchannels only carry the data of the determined data but is not inserted by pilot frequency. The invention discloses a device for realizing the method simultaneously. The invention has simple realization and saves the carrier resources of the system under the premise that the communication effect of the users is not impacted.

Description

Technical field [0001] The invention relates to a carrier distribution technology in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system, and in particular to a method and device for carrier distribution in an Orthogonal Frequency Division Multiplexing Access system. Background technique [0002] In recent years, in the new generation of broadband wireless communication systems, Orthogonal Frequency Division Multiplexing (OFDM) technology has replaced single-carrier spread spectrum technology (such as CDMA) and has become the mainstream basic transmission technology. Early adopters of OFDM technology include digital broadcasting (DAB) and digital television (DVB). Subsequently, broadband wireless access systems IEEE 802.11g / a / n, 802.16d / e, and 802.20 are also based on OFDM / OFDMA technology. At present, almost all emerging technologies in the field of wireless communication use OFDM as the core. As we all know, the OFDM signal is composed of a number of orthogonal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02H04L27/26
Inventor 张海卓
Owner ZTE CORP
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