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A Method of Obtaining Sampling Jitter

A last-time, correlation sequence technology, applied to the shaping network in the transmitter/receiver, baseband system components, etc., to achieve the effect of reducing the amount of calculation

Inactive Publication Date: 2016-09-28
北京电信技术发展产业协会 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, sampling jitter is a small value, but existing schemes often estimate large values ​​frequently at low SNR

Method used

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  • A Method of Obtaining Sampling Jitter
  • A Method of Obtaining Sampling Jitter
  • A Method of Obtaining Sampling Jitter

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0048] Step 101, calculating correlation sequences of channel estimation before and after sampling jittering.

[0049] In the LTE system, there are usually multiple antennas in the eNB and UE, and the channel estimation on multiple Tx-Rx paths is combined, and the correlation sequence is calculated using the following formula:

[0050] c k = Σ p ∈ Tx _ jitter Σ q ∈ Rx _ jitter h A , k ( p , q ) ( h B , k ...

specific Embodiment approach 2

[0058] In fact, the basic scheme can be optimized by introducing a binary search to quickly find the optimal dithering hypothesis. This can reduce the amount of computation to a great extent.

[0059] Taking the example in the specific implementation mode 1 as an example, in order to find the best jitter assumption, the number of binary searches is defined as N times =3, each search progress is [1 / 2, 1 / 4, 1 / 8]. Assuming that the sampling jitter is 1 / 4, then the optimization scheme using binary search is as follows image 3 shown.

[0060] Step 201, starting from 0, with 1 / 2 precision, try hypotheses -1 / 2 and 1 / 2 respectively. The correlation value corresponding to hypothesis 1 / 2 is relatively large, so hypothesis 1 / 2 is reserved for the next search.

[0061] Step 202, starting from 1 / 2, with 1 / 4 precision, try hypotheses 1 / 4 and 3 / 4 respectively. The correlation value corresponding to hypothesis 1 / 4 is relatively large, so hypothesis 1 / 4 is reserved for the next search. ...

specific Embodiment approach 3

[0066] The detailed procedure for obtaining sampling jitter includes the following steps:

[0067] Step 301, initializing the basic correlation sequence;

[0068] Step 302, initializing the variable for recording the maximum correlation value;

[0069] Step 303, initialize the best jitter estimate, the correlation value corresponding to the best jitter estimate is the maximum correlation value;

[0070] Step 304, initialize the jitter estimation obtained from the previous search;

[0071] Step 305, initialize the counter of the search times;

[0072] Step 306, adding the accuracy step size of this search on the basis of the previous jitter estimation to form a new jitter assumption and implementing the assumption;

[0073] Step 307, if the current jitter assumption is within the valid range, calculate the correlation value of the current jitter assumption, otherwise set the current jitter assumption to 0;

[0074] Step 308, if the correlation value is greater than the stor...

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Abstract

The invention provides a sampling jitter acquisition method applicable to an LTE system. The method includes: firstly calculating related sequences of channel estimations before and after a sampling jitter; and applying a predetermined number of predefined jitter hypothesis values to the related sequences and acquiring the most possible jitter hypothesis value. Through the sampling jitter acquisition method, an optimal jitter hypothesis can be found and calculations can be reduced in a great degree.

Description

【Technical field】 [0001] The invention relates to the technical field of wireless communication, in particular to a method for acquiring sampling jitter. 【Background technique】 [0002] In the LTE system, the UE will continuously shut down and restart the RFIC and BBIC during normal data reception and micro-sleep, which will cause the jitter of the sampling clock. That is, a restarted IC introduces a small timing offset compared to the IC during the previous working period. The range of this time offset depends on the RFIC, denoting the range as [-Δ max ,Δ max ]. [0003] figure 1 Timing offset due to sampling jitter is indicated. figure 1 In , squares represent OFDM symbols; squares 0 and 4 represent OFDM symbols carrying RS information; "gap" (interval) represents the time length of RFIC between two adjacent operations. [0004] Sampling jitter can have some bad effects on the system. For example, when the system calculates some important estimation operations, filt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 杨骅金毅敦陈晓忠
Owner 北京电信技术发展产业协会