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Method for allocating sub-carrier and sub-carrier allocation system

A technology for allocating sub-carriers and sub-carriers, which is applied in the field of communication, can solve the problems of increasing channel capacity and not being able to truly reflect the quality of the channel, and achieve the effects of increasing system capacity, improving spectrum utilization, and improving performance

Inactive Publication Date: 2008-01-09
HUAWEI TECH CO LTD
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Problems solved by technology

[0015] The present invention provides a method for allocating subcarriers and a subcarrier allocating system. The present invention solves the problems existing in the prior art due to only considering the time CINR value flat, which leads to the fact that the quality of the channel cannot be truly reflected when the channel is selected according to the CINR value, thus limiting the improvement of the system channel capacity

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  • Method for allocating sub-carrier and sub-carrier allocation system
  • Method for allocating sub-carrier and sub-carrier allocation system
  • Method for allocating sub-carrier and sub-carrier allocation system

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Embodiment Construction

[0060] The AMC subcarrier allocation mode is to put adjacent consecutive subcarriers together. Its demodulation performance is closely related to subcarriers with low channel response. In a Band, the greater the fluctuation of the channel response, the worse the demodulation performance of the channel. Therefore, when starting the AMC allocation mode, it must be ensured that the subcarriers in the Band are within the coherent bandwidth in the frequency domain, so that the demodulation performance can be guaranteed. The present invention considers that the coherent bandwidth in the frequency domain is closely related to the channel delay extension, so using the close correlation between the channel delay extension and the coherent bandwidth in the frequency domain, it proposes that when the AMC allocation mode is started, the channel delay extension must be less than that according to the wireless communication interface. The channel delay extension threshold set by the bandwi...

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Abstract

The key ideal of the invention comprises: using the precious sync result obtained from downlink sync process to determine the time delay expansion of channel; based on the bandwidth preset by system, determining the time delay expansion threshold value; according to said time delay expansion value of channel and said time delay expansion threshold, determining the mode of allocating subcarrier; based on said subcarrier allocating mode, allocating the subcarrier to the terminal. The invention improves the performance of system demodulation and frequency spectrum.

Description

technical field [0001] The present invention relates to the communication field, in particular to subcarrier allocation technology. Background technique [0002] In recent years, a multi-carrier transmission technology represented by OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) has attracted widespread attention. Later, OFDMA (Orthogonal Frequency Division Multiplexing Access) technology was gradually developed on the basis of the OFDM technology. The OFDMA technology adopts a multiple access mode, which allows simultaneous access to multiple channels within one OFDM symbol. terminals, so the OFDM symbols need to be allocated to multiple terminals. [0003] In the 802.16e standard, subcarrier allocation modes are defined according to different channel environments, including distributed allocation mode and AMC (Adaptive Modulation and Coding, adaptive modulation and coding) allocation mode, and the mutual switching between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L27/26H04J13/02H04L1/00H04W72/04
Inventor 郑德来吴和兵王吉滨
Owner HUAWEI TECH CO LTD
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