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An OFDMA system frequency deviation estimating method based on the sub-carrier interleaving allocation

A technology of frequency offset estimation and sub-carrier, which is applied in the field of OFDMA frequency offset estimation, can solve the problems of separation of timing synchronization and frequency offset estimation, high spectrum utilization rate, and low spectrum utilization rate, so as to reduce computational complexity and increase The effect of unifying the number of subspaces, timing synchronization and frequency offset estimation

Inactive Publication Date: 2007-10-17
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Aiming at the problems of timing synchronization and frequency offset estimation separation and low frequency spectrum utilization in the existing OFDMA system uplink blind frequency offset estimation method, the present invention uses subcarrier interleaving OFDMA system uplink signal spectrum characteristics to propose a method that does not require prior Blind estimation method of subcarrier frequency offset based on power spectrum superposition with timing synchronization and high spectrum utilization

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  • An OFDMA system frequency deviation estimating method based on the sub-carrier interleaving allocation
  • An OFDMA system frequency deviation estimating method based on the sub-carrier interleaving allocation
  • An OFDMA system frequency deviation estimating method based on the sub-carrier interleaving allocation

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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

[0030] In the OFDMA system, there are mainly two subcarrier allocation methods: block (Block) allocation and interleaving (Interleaved) allocation. The interweaving allocation method can provide the greatest frequency diversity and channel diversity, but because the subcarriers of different users are close to each other, it is also easy to cause interference between users.

[0031] The interleaving allocation method is shown in Figure 1: Assume a subcarrier interleaving OFDMA system with a total number of N subcarriers, and the number of users is U. Divide N subcarriers into Q subchannels {SC 1 , SC 2 ,...,SC Q}Each subchannel contains P=N / Q subcarriers {SC i，1 , SC i，2 ,...,SC i，P}. The p-th sub-carrier in each sub-channel constitutes the p-th sub-carrier group SC group p, where p=1, . . . , P. Assume that user i (i≤U) occupies ...

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Abstract

The invention discloses a sub-channel blind frequency deviation estimation method based on power spectrum stack with high frequency spectrum availability ratio, it does not need regularly synchronization in advance, which aims at problems of timing synchronization and frequency deviation estimate isolation and low availability ratio of frequency spectrum in present OFDMA system uplink blind frequency deviation estimation method. The invention utilizes characteristics of same carrier frequency deviation of same user on each sub-carrier and final circulation prefix, carries out appropriate extraction to the auto-correlation function, carries out the power spectrum stack with sub-carriers of same user, thereby makes the availability of frequency spectrum higher, estimation complexity is reduced and is more accurate.

Description

technical field [0001] The invention relates to a carrier frequency offset estimation method in OFDMA wireless communication, in particular to an OFDMA frequency offset estimation method based on subcarrier interleaving allocation. Background technique [0002] OFDMA (Orthogonal Frequency Division Multiplexing Access, Orthogonal Frequency Division Multiple Access) is a combination of OFDM (Orthogonal Frequency Division Multiplexing) and FDMA (Frequency Division Multiple Access) technology. Realize multi-user access. In an OFDMA system, users occupy different subcarriers, so multiple users perform data transmission at the same time to achieve multiple access; at the same time, due to the orthogonality between each subcarrier, there is no need to insert guard frequency bands between different users, and the user frequency band They overlap each other, thereby greatly improving the spectrum utilization rate compared with FDMA; the orthogonality between subcarriers can also red...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/707H04J11/00
Inventor 殷勤业王毅吉欣王慧明
Owner XI AN JIAOTONG UNIV
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