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Frequency offset estimation method and device for user terminal and user terminal

A frequency offset estimation and user terminal technology, applied in the field of communication, can solve problems such as reducing UE and increasing UE power consumption, and achieve the effects of shortening time, improving accuracy and improving quality

Active Publication Date: 2016-06-29
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this process, the UE needs to keep receiving signals, so the standby time of the UE will be reduced, resulting in increased power consumption of the UE

Method used

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  • Frequency offset estimation method and device for user terminal and user terminal
  • Frequency offset estimation method and device for user terminal and user terminal
  • Frequency offset estimation method and device for user terminal and user terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , this embodiment provides a method for estimating a frequency offset of a user terminal, the method for estimating a frequency offset includes the following steps:

[0037] Step 100: Receive pilot symbols.

[0038] In the paging process of WCDMA, the UE receives the P-CPICH radio frame sent by the base station through the P-CPICH channel, and the PICH radio frame sent by the base station through the PICH channel, and the PICH radio frame can carry multiple PIs.

[0039] Among them, see figure 2 , the UE may include at least two multipath demodulation units 01, and the multiple multipath demodulation units 01 may be connected in parallel. The P-CPICH radio frame is despread by the multipath demodulation unit 01 to obtain P-CPICH symbols, that is, pilot symbols, and the PICH radio frame is despread by the multipath demodulation unit 01 to obtain PICH symbols. The pilot symbols and PICH symbols are coherently demodulated by the multiplier 02 to obtain cor...

Embodiment 2

[0065] see Figure 4 , this embodiment provides a frequency offset estimation device 10 for a user terminal, and the frequency offset estimation device 10 includes:

[0066] a receiving unit 102, configured to receive pilot symbols;

[0067] An adjustment unit 104, configured to adjust the pilot symbols in the pilot symbol window according to the preset I frequency offset estimation values ​​when the pilot symbols received by the receiving unit 102 meet the preset pilot symbol window correspondingly obtain the adjusted I group of pilot symbols, the pilot symbol window includes more than two pilot symbols received continuously, and at least part of the pilot symbols correspond to the paging indication to be demodulated at the current moment, The I is an integer greater than 1;

[0068] The calculation unit 106 is configured to calculate the energy value of the sum of the adjusted pilot symbols of each group respectively, and compare the energy values ​​of the sum of the adjus...

Embodiment 3

[0072] see Figure 5 , this embodiment provides a UE, and the UE may include the frequency offset estimation apparatus 10 described in the second embodiment.

[0073] In a specific implementation, the UE may further include at least two multipath demodulation units 01, and the frequency offset estimation device 10 may be connected to the multipath demodulation units 01. Specifically, the receiving unit of the frequency offset estimation device 10 may be connected to the multipath demodulation unit 01 . After the pilot symbols in the pilot symbol window pass through each multipath demodulation unit 01 at the same time, the frequency offset estimation device 10 estimates the frequency offset generated by the pilot symbols.

[0074] In a specific implementation, when the UE includes M multipath demodulation units 01, the energy value of the sum of each group of adjusted pilot symbols calculated by the calculation unit of the frequency offset estimation device 10 may be M A sum ...

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Abstract

The invention discloses a method and a device for estimating frequency offset of a user terminal, and a user terminal. The method comprises: receiving a pilot symbol; when the received pilot symbol satisfies a preset pilot symbol window, in accordance with preset I frequency offset estimating values, adjusting phase of the pilot symbol in the pilot symbol window, to obtain correspondingly adjusted I groups of pilot symbols, the pilot symbol window including more than two consecutively received pilot symbols, and at least a part of the pilot symbols corresponding to a paging instruction to be demodulated currently; calculating respectively an energy value of a sum of each group of adjusted pilot symbols, comparing the energy values of the sum of said I groups of adjusted pilot symbols to obtain a maximum energy value, and making the frequency offset estimating value corresponding to the maximum energy value as a best frequency offset estimating value. By the method and device, the frequency offset generated during paging process can be estimated quickly to prolong a standby time of a user terminal and reduce power consumption of the user terminal.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for estimating frequency offset of a user terminal and the user terminal. Background technique [0002] In the paging process of the mobile communication system, the base station needs to send a paging indication (PagingIndication, PI) to the user terminal (UserEquipment, UE), and the UE needs to demodulate the received PI to obtain the correct PI, so as to obtain the correct Paging message, establish corresponding communication. [0003] For example, in a paging process of a Wideband Code Division Multiple Access (WCDMA) communication system, the base station needs to send PI to the UE through a paging indication channel (PagingIndicationChannel, PICH). Usually, the base station combines multiple UEs into a receiving group, and the PI is used to identify the specific receiving group to which the UE belongs. Multiple PIs can be carried in each...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7073H04L27/00
Inventor 陈军伟
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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