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

A technology of frequency offset estimation and subcarriers, which is applied in the field of OFDMA frequency offset estimation, can solve the problems of high spectrum utilization, low spectrum utilization, timing synchronization and separation of frequency offset estimation, etc., to increase the number of subspaces, timing Synchronization and frequency offset estimation are unified and the effect of reducing computational complexity
CN100562000CInactive Publication Date: 2009-11-18XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2009-11-18
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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