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Frequency deviation estimating method and device

A technology of frequency offset estimation and estimated value, applied in the field of communication, can solve the problem of difficulty in MIMO frequency offset estimation, and achieve the effect of multi-user frequency offset estimation and effective multi-user frequency offset estimation

Inactive Publication Date: 2014-04-09
ZTE CORP
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Problems solved by technology

[0005] Therefore, the frequency offset problem has become one of the core problems of OFDM technology. At present, many communication engineers have proposed various solutions to the frequency offset problem. The frequency offset estimation method for a single user has relatively high accuracy and is relatively simple to implement; but Frequency offset estimation for multi-user MIMO is still difficult, especially for single-pilot multi-user MIMO

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  • Frequency deviation estimating method and device

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Embodiment Construction

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0016] figure 2 is a flowchart of a frequency offset estimation method according to an embodiment of the present invention. Such as figure 2 As shown, the frequency offset estimation method according to the embodiment of the present invention includes:

[0017] Step S102, obtaining channel estimation values ​​in the frequency domain of pilot bits superimposed by multiple users.

[0018] Step S104, performing separation and noise reduction on the above multi-user superimposed pilot bit frequency-domain channel estimation values, and obtaining un-noise-reduced and noise-reduced channel estimation values ​​of each of the multi-users.

[0019] Step S106, using the local frequency domain pilot bit d...

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Abstract

The invention discloses a frequency deviation estimating method and device. The frequency deviation estimating method comprises the following steps of: obtaining an estimated value of a frequency domain channel at a pilot frequency site which is overlapped by a plurality of users; carrying out separation and noise reduction on the estimated value of the frequency domain channel at the pilot frequency position which is overlapped by the plurality of the users to obtain channel estimated values without noise reduction and the noise-reduced channel estimated values of each user in the plurality of the users; and carrying out frequency deviation estimation by demodulation reference marks of the pilot frequency site in a local frequency domain of each user, the channel estimated values without noise reduction and the noise-reduced channel estimated values of each user. With the adoption of the technical scheme provided by the invention, the problem that the multi-user frequency deviation estimation is more difficult is solved, so that the multi-user frequency deviation estimation is simply and effectively realized.

Description

technical field [0001] The present invention relates to the communication field, in particular to a frequency offset estimation method and device. Background technique [0002] The Long Term Evolution (referred to as LTE) project is the largest new technology research and development project initiated by the 3rd Generation Partnership Project (3GPP) in the past two years. It improves and enhances the 3G air access into technology. Compared with 3G, LTE has more technical advantages, reflected in higher user data rate, packet transmission, reduced system delay, improved system capacity and coverage, and reduced operating costs. [0003] The LTE downlink adopts Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM has the characteristics of high spectrum utilization and anti-multipath interference. The OFDM system can effectively resist the impact of wireless channels. The LTE uplink transmission scheme adopts a single carrier-frequency division multiple access ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 李萍
Owner ZTE CORP