Method and system for frequency offset estimation in a mobile communication system
A mobile communication system, frequency offset estimation technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve the problem that small frequency offset estimation can not meet the requirements and so on
Active Publication Date: 2019-10-29
ASR MICROELECTRONICS CO LTD
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Problems solved by technology
The small frequency offset estimation in the follow-up tracking stage often cannot meet the requirements, and at this time, if the initial large frequency offset estimation is started, additional hardware computing logic resources are required
Method used
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Embodiment Construction
[0048] see figure 2 , Embodiment 1 of the frequency offset estimation method in the mobile communication system provided by the present application includes the following steps.
[0049] Step S202: According to the pilot information, the channels h(t1), h(t2), h(t3), and h(t4) of the mobile terminal at four time points t1, t2, t3, and t4 are respectively estimated, as shown in formula 1 .
[0050] see image 3 , where each small square represents a resource unit (resource element, RE). The value requirements of the four selected moments t1, t2, t3, t4 are t1≠t2, t3≠t4, Δt1≠Δt2, and Δt'<min{Δt1, Δt2}. Among them, Δt1=t2-t1, Δt2=t4-t3, Δt'=|Δt1-Δt2|, the double vertical lines represent the absolute value, and the min function represents the minimum value. In addition to the above requirements, certain moments may be the same, for example, t2 and t3 may be the same, t1 and t3 may be the same, and t2 and t4 may be the same. The sequence of the four moments is not strictly re...
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The invention discloses a frequency offset estimation method in a mobile communication system. The method includes: respectively estimating channels of the mobile terminal at four moments according tothe pilot frequency information; performing first-order difference operation according to the channel estimation values at two different moments, and performing first-order difference operation according to the channel estimation values at the other two different moments; according to the phase information obtained by the two first-order difference operation results, obtaining first-order difference phase offset estimates through inverse trigonometric function operation; obtaining first-order difference frequency division offset estimates from the two first-order difference phase offset estimates respectively; carrying out second-order differential operation on the two first-order differential operation results and the two first-order differential frequency division offset estimates to obtain a second-order differential operation result; according to the phase information obtained by the second-order difference operation result, obtaining a second-order difference phase offset estimation amount through inverse trigonometric function operation; and obtaining a second-order difference frequency division offset estimation amount according to the second-order difference phase offset estimation amount. The frequency offset estimation method can enlarge the frequency offset estimation range and has the characteristic of high precision.
Description
technical field [0001] The present application relates to a frequency offset estimation method and system in a mobile communication system. Background technique [0002] In a mobile communication system, due to the effects of crystal oscillator (crystal oscillator, crystal oscillator) performance, Doppler shift (Doppler shift) and other factors, there is a frequency deviation (abbreviated as frequency deviation) in received signals. When the frequency error exceeds 0.05ppm (parts per million, parts per million), it will seriously affect the service quality, resulting in failure to transmit data or call drop. [0003] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system is sensitive to frequency offset. The traditional frequency offset estimation tracking often implements a complete frequency offset estimation tracking solution through the initial large frequency offset estimation in the network search dwell phase and the small...
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 储昭亮肖灯伟朱仕轶
Owner ASR MICROELECTRONICS CO LTD