Channel correcting method and system

A channel correction and channel technology, applied in the field of channel correction, can solve problems affecting system capacity, etc.

Inactive Publication Date: 2006-10-25
HUAWEI TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0005] The present invention provides a method and system for channel correction to solve the problem of affecting system capacity when correcting channels in the prior art

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Embodiment Construction

[0040] The way of allocating subcarriers determines the different modes of OFDMA system operation. If at a certain moment, not all of the subcarriers are used, there are idle subcarriers. Due to requirements such as sectorized networking, usually each sector of the OFDMA system reserves idle subcarriers in a dynamic or static manner. Taking the IEEE 802.16 standard as an example, under the PUSC (Partial Usage of SubChannel) mode in IEEE 802.16, three sectors share all subcarriers, so that each sector has a certain number of idle subcarriers, and for example In IEEE 802.16, the full usage of sub-channels is the FUSC (Full Usage of Sub-Channel) mode. In order to reduce the interference between sectors, the load of each sector will not reach 100%, that is, a part of idle sub-carriers will be reserved. Other modes of the IEEE 802.16 standard are similar. The relationship between the used subcarriers and idle subcarriers of the OFDMA system is as follows: figure 1 shown.

[004...

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Abstract

The method uses different vacant sub carrier waves to load given signals in different channels. The given signals carried by the said vacant sub carrier waves are sent to coupler; and through the coupler, a loop is formed locally. The method divides up vacant sub carrier signal through different channel at receiving end of the local loop according to different channels to pick up estimated values of reflecting different channel characteristics. Corrections of channels are carried out are based on the said estimated values. The invention also discloses a correction system of transmission channel and a correction system of reception channel. The invention uses initiative transmission mode, and accomplishes channel correction automatically. The correction procedure does not generate any influence on normal service and does not affect capacity of the system. In addition, using local loop also does not affect coverage of system.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a channel correction method and system. Background technique [0002] As a special way of multi-carrier transmission, the concept of Orthogonal Frequency Division Multiplexing (OFDM) appeared as early as the 1950s, and the first patent on OFDM technology was obtained by the US Patent Office in early 1970 Authorized OFDM is a high-speed transmission technology in a wireless environment. The main idea is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel. It not only has strong anti-interference ability, but also improves spectrum utilization. Due to limited processing capacity at that time, OFDM technology was not valued and applied by the industry when it appeared. Until the early 1990s, with the development of processing capability and OFDM tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L5/02H04L27/26
Inventor 叶四清曹爱军杨芳梁
Owner HUAWEI TECH CO LTD
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