Channel correcting method and system

A channel correction, channel technology, applied in the field of channel correction, can solve problems such as affecting system capacity

Inactive Publication Date: 2009-07-15
HUAWEI TECH CO LTD
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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 invention discloses a method for channel correction. In the method, different vacant subcarriers are used to carry known signals in different channels; the known signals carried by vacant subcarriers are sent to the local coupling through a corrected transceiver at the frequency point of the receiving channel. The device mixes the normal service signal from the antenna array with the signal from the correction transceiver, sends it to the normal transceiver for processing, and then sends it to the correction calculation unit. The correction calculation unit determines the estimated values ​​of the characteristics of different channels, and The determined estimated value is transmitted to the normal baseband processing unit, and the normal baseband processing unit corrects the corresponding channel according to the estimated value. The invention also discloses a transmitting channel correction system and a receiving channel correction system. The present invention adopts the mode of active transmission on the vacant orthogonal sub-carrier to automatically complete the channel correction, and the correction process has no influence on the normal business, thus does not affect the capacity of the system, and also does not affect the coverage of the system through the local loopback.

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 power and OFDM technolo...

Claims

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Application Information

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