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Estimation and processing method for frequency offset in OFDMA system

A technology of frequency offset and processing method, which is applied in the field of OFDMA technology, can solve problems such as SER performance degradation, and achieve the effect of improving utilization rate and efficiency

Inactive Publication Date: 2008-10-29
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

It can be clearly seen from the figure that when this frequency offset is greater than 0.05, the SER performance will be seriously degraded

Method used

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  • Estimation and processing method for frequency offset in OFDMA system
  • Estimation and processing method for frequency offset in OFDMA system
  • Estimation and processing method for frequency offset in OFDMA system

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Embodiment Construction

[0030] How to complete the estimation of the frequency offset by using one OFDM symbol. The present invention uses super-resolution estimation at the receiving end. Therefore, the allocation of subcarriers in a short OFDM symbol is at most half of the total number of subcarriers, and the distribution is equally spaced. Such as Figure 4 shown.

[0031] How to design guard bandwidth. It can be measured through simulation and calculation that when the frequency offset is not greater than 5%, the guard bandwidth is 4 subcarriers. Such as Figure 5 shown.

[0032] How to effectively use the guard bandwidth, so as to improve the utilization efficiency of subcarriers. The self-channel assigned to each user is divided into two parts, the middle part is the same as the original processing mode, and the two sides part adopts the frequency diversity method in two consecutive OFDM symbols.

[0033] Figure 6 An embodiment of processing at the transmitting end of the system ...

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Abstract

The invention discloses a processing method of the estimation of frequency offset in an OFDMA system. The steps at a transmitting terminal comprise that: firstly, all sub-carriers in sub-channels are divided into a middle part and two side parts; secondly, according to the means of frequency diversity, the sub-carriers at the two side parts are processed, and according to the means of multiplexing or frequency diversity, the sub-carriers at the middle part is processed; thirdly, IDFT conversion is carried out; fourthly, CP is increased; fifthly, an OFDM symbol loaded with Pilot is laid. The processing method of the invention has the advantages of protecting the processing of the sub-carriers in bandwidth and avoiding simply discarding, thus improving the utilization rate of frequency; the utilization rate can be improved to one second of the protection bandwidth according to judgment.

Description

technical field [0001] The present invention relates to the field based on OFDMA technology, in particular to the estimation and processing method of frequency offset in OFDMA system. Background technique [0002] Such as figure 1 As shown, when the carrier frequency of the transmitting end is different from that of the receiving end, a frequency offset will result. This phenomenon is more severe on the uplink in FDD mode. [0003] figure 2 The SER performance of the system in the presence of frequency offset is given in . It can be clearly seen from the figure that when the frequency offset is greater than 0.05, the SER performance will be severely degraded. [0004] Therefore, it is necessary to find an effective solution to estimate the frequency offset between the transmitting end and the receiving end, and perform frequency offset compensation correctly. [0005] Generally speaking, the frequency offset estimation needs to use 2 OFDM symbols to transmit the same i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 梁宗闯
Owner BEIJING SAMSUNG TELECOM R&D CENT