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Device and method for adaptive compensation of SCO in LTE system

A self-adaptive compensation and self-adaptive technology, applied in the field of communication, can solve the problems of interference, system performance degradation, slow baseband signal convergence speed, etc., to achieve the effect of maintaining stable performance

Active Publication Date: 2016-04-13
合肥东芯通信股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If the RF clock crystal oscillator is compensated only by the estimated value of SCO, on the one hand, the clock crystal oscillator may not be able to achieve the estimation accuracy of SCO, and on the other hand, the convergence speed of the baseband signal is slow, resulting in a problem of system performance degradation
If only SCO is compensated by interpolation and filtering in the digital domain in the prior art, when the value of SCO is greater than 7.5kHz, the DC (central direct current) subcarrier is shifted by half a subcarrier or more, and the DC compensation module of the baseband is correct for DC / Signals of non-DC subcarriers will cause interference, which will also cause system performance degradation

Method used

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  • Device and method for adaptive compensation of SCO in LTE system
  • Device and method for adaptive compensation of SCO in LTE system
  • Device and method for adaptive compensation of SCO in LTE system

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Embodiment 1

[0068] Such as image 3 As shown, it is a schematic structural diagram of an apparatus for adaptively compensating SCO in an LTE system disclosed in Embodiment 1 of the present invention, which mainly includes: a first decision module 10 and an adaptive SCO compensation module 11;

[0069] in,

[0070] The first judgment module 10 is used to judge whether the current subframe is a normally received downlink DL subframe, and if it is judged that the current subframe is a normally received downlink DL subframe, then perform adaptive sampling clock offset SCO compensation Module 11;

[0071] The self-adaptive SCO compensation module 11 is used to obtain the CFO after dividing by 7.5kHz in the case of judging that the CFO is greater than or equal to 7.5kHz, and in the case of judging that the carrier frequency offset value CFO is greater than or equal to 7.5kHz. For the obtained integer part value, adjust the sampling clock frequency to synchronize with the carrier frequency, an...

Embodiment 2

[0089] Such as Figure 5 As shown, it is a schematic structural diagram of an apparatus for adaptively compensating SCO in an LTE system disclosed in Embodiment 2 of the present invention, which mainly includes: a first decision module 10, an adaptive SCO compensation module 11 and an SCO timing prediction and adjustment module 12;

[0090] in,

[0091] The first judgment module 10 is used to judge whether the current subframe is a normally received downlink DL subframe, and if it is judged that the current subframe is a normally received downlink DL subframe, then perform adaptive sampling clock offset SCO compensation Module 11, if it is judged that the current subframe is an uplink UL subframe or a discontinuous reception DRX subframe, then execute the SCO timing prediction adjustment module 12;

[0092] The adaptive SCO compensation module 11 is used to obtain the integer part value obtained after dividing CFO and 7.5kHz first when it is judged that CFO is greater than or...

Embodiment 3

[0104] Corresponding to the device for adaptively compensating for SCO in the LTE system disclosed in the above-mentioned embodiments of the present invention, the embodiment of the present invention also discloses a method for adaptively compensating for SCO in the LTE system, and the specific implementation of the method for adaptively compensating for SCO is The process includes:

[0105] First, judge whether the current subframe is a normally received downlink DL subframe, and if it is judged that the current subframe is a normally received downlink DL subframe, then perform an adaptive sampling clock offset SCO compensation process;

[0106] The adaptive SCO compensation process includes:

[0107] In the case of judging that CFO is greater than or equal to 7.5kHz, first obtain the integer part value obtained by dividing CFO by 7.5kHz, perform adjustment of sampling clock frequency and carrier frequency synchronization, and then obtain CFO and 7.5kHz modulo obtained CFO% ...

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Abstract

The invention discloses a device and a method for adaptive compensation of SCO in an LTE system. When a DL subframe is normally received, if it is determined that CFO is equal to or greater than 7.5 kHz, then the value of the integer part which is obtained after dividing CFO by 7.5 kHz is acquired, synchronization adjustment of the sampling clock frequency and the carrier frequency is executed, then the value of CFO%7.5 kHz is obtained after modulus of CFO and 7.5 kHz, and SCO compensation is executed; if it is determined that CFO is smaller than 7.5 kHz, then the value of CFO%7.5 kHz which is acquired after modulus of CFO and 7.5 kHz is directly obtained, and SCO compensation is executed. Therefore, based on the technical scheme of the invention, the performance of the whole system is guaranteed to be stable during the SCO compensation process.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a device and method for adaptively compensating SCO (Sampling Clock Offset, sampling clock offset) in LTE (Long Term Evolution system, long term evolution system). Background technique [0002] In the OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-carrier system of LTE (Long Term Evolution system, long-term evolution system), in order to correctly restore the OFDM symbol information at the sending end, timing synchronization must be achieved, because the sampling clock of the receiver and the transmitter The symbol clocks are independent of each other, and there are inherent deviations, and the frequency of the transceiver crystal oscillator is greatly affected by the outside world such as temperature, which causes the SCO (Sampling Clock Offset, sampling clock offset) to appear time-varying, which brings phase ro...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2662
Inventor 任江涛张国松吴齐发唐相国
Owner 合肥东芯通信股份有限公司
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