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Method for protecting sub-carrier in distributing orthogonal multi-path frequency-division duplicating system

A technology of frequency division multiplexing and subcarrier spacing, which is applied in the directions of frequency division multiplexing system components and multi-frequency code systems. , to achieve the effect of improving utilization and increasing system capacity

Inactive Publication Date: 2007-04-04
HUAWEI TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although this solution is very simple to implement and can ensure that the bandwidth higher than the middle bandwidth meets the requirements of the spectrum mask, it may cause the bandwidth lower than the middle bandwidth to fail to meet the requirements of the spectrum mask
Another solution is to obtain the proportion of subcarriers according to the minimum bandwidth requirements. For this solution, although all bandwidths can be guaranteed to meet the requirements of the spectrum template, it will obviously bring a greater impact on other bandwidths larger than the minimum bandwidth. bandwidth waste
[0011] To sum up, the current protection subcarrier allocation scheme often wastes precious spectrum resources in the case of high system bandwidth, and the situation that the allocated subcarriers may not meet the requirements of the spectrum mask in the case of low system bandwidth

Method used

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  • Method for protecting sub-carrier in distributing orthogonal multi-path frequency-division duplicating system
  • Method for protecting sub-carrier in distributing orthogonal multi-path frequency-division duplicating system
  • Method for protecting sub-carrier in distributing orthogonal multi-path frequency-division duplicating system

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Embodiment Construction

[0037] From the perspective of medium and radio frequencies, reserving the same fixed guard bandwidth under different bandwidths satisfies the spectrum mask in the same way, that is, under different bandwidths, the reserved guard bandwidth can be the same and all Can meet the requirements of the spectrum template. Therefore, the solution of the present invention is mainly to determine the guard frequency width that should be reserved at both ends of the frequency band according to the index requirements of the system or standard spectrum template, and then define the subcarrier interval according to the mobile speed and time delay extension supported by the OFDM system. The spacing can be realized by determining the number of FFT points under different bandwidths, and then determining the number of guard sub-carriers at both ends according to the defined sub-carrier spacing and the reserved guard frequency bandwidth.

[0038] The solution of the present invention will be furth...

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Abstract

The method comprises: at first, defining the width of guard band reserved at both ends of frequency band according to the requirement of spectrum mask; then getting the carrier separation according to the traveling speed and delay spread supported by OFDM; finally, defining the numbers of guard subcarriers at both ends according to the defined guard band width and subcarrier separation.

Description

technical field [0001] The present invention relates to an Orthogonal Multiplexing Frequency Division Multiplexing (OFDM) system, and more precisely relates to a method for allocating guard subcarriers in the OFDM system. Background technique [0002] OFDM technology is a wireless communication technology that has received widespread attention in recent years. Its main feature is to disperse data on a group of orthogonal subcarriers for parallel transmission. Since the interval between subcarriers is only half of the subcarrier bandwidth, OFDM technology can provide better spectrum utilization than traditional frequency division multiplexing technology, and the higher the bandwidth of the system, the more the number of subcarriers, the greater the spectrum utilization. The more obvious the effect is. Therefore, OFDM technology is more and more used in broadband wireless data transmission, for example, it has been used in Wireless Metropolitan Area Network (WMAN), Digital Au...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J1/10
Inventor 李云岗王吉滨吴建军
Owner HUAWEI TECH CO LTD
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