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Method and device for estimating carrier frequency offset

A carrier frequency offset, estimation module technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system and other directions, can solve the problem of CFO estimation performance degradation, etc., to achieve the effect of solving the CFO estimation performance degradation

Active Publication Date: 2017-06-09
SANECHIPS TECH CO LTD
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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a CFO estimation method and device, which can solve the problem of CFO estimation performance degradation when there is no downlink traffic scheduling

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  • Method and device for estimating carrier frequency offset
  • Method and device for estimating carrier frequency offset
  • Method and device for estimating carrier frequency offset

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Embodiment Construction

[0033] The basic idea of ​​the present invention is: since the detection of CFO is after the PSS, the uplink and downlink configuration of the base station is unknown, at this time, the UE only has half-frame timing of 5ms, and the frame timing of 10ms needs to be determined after SSS detection; and some signals, such as A broadcast channel (Physical Broadcast CHannel, PBCH) is performed with a transmission period of 10 ms, but at this time, the UE has not obtained frame timing. Therefore, in order to maximize the use of available signals, it is also necessary to pre-set the frame timing to perform frame synchronization on the received subframes, and perform correlation and accumulation respectively, and finally select the one with a larger modulus value for CFO estimation;

[0034] According to different frame timings and CP modes, perform autocorrelation estimation and accumulation on the non-service downlink signals in the received downlink subframes; compare the modulus of ...

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Abstract

The invention discloses a method for estimating carrier frequency spectrum (CFO). The method includes: according to different frame timings and CP modes, respectively performing autocorrelation estimation and accumulation on non-service downlink signals in received downlink subframes; comparing The modulus of the cumulative result obtained, and the cumulative result with a large modulus is selected for CFO estimation. According to the characteristics of the LTE system, the present invention uses the non-service downlink signal in the downlink subframe to perform CFO estimation, which can solve the problem of CFO estimation performance degradation when there is no downlink service scheduling, and can avoid affecting subsequent SSS detection.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a carrier frequency offset (Carrier Frequency Offset, CFO) estimation method and device. Background technique [0002] In a wireless communication system, when the carrier frequencies of the base station and the user equipment (UE) are inconsistent, it will appear as CFO on the receiver. Most wireless systems, especially Orthogonal Frequency Division Multiplexing (OFDM) systems, are very sensitive to CFO. [0003] CFO will seriously affect the performance of the receiver, so the estimation of initial CFO is very important. During the initial synchronization in the Long Term Evolution (LTE) system, usually a primary synchronization signal (Primary Synchronization Signal, PSS) is used for correlation first, and a timing of 5 ms can be obtained. [0004] Since OFDM symbols have a cyclic prefix (Cyclic Prefix, CP), frequency offset estimation can be performed in an aut...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657
Inventor 李焱
Owner SANECHIPS TECH CO LTD
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