CN108282421B - Method for estimating frequency offset of uplink control channel - Google Patents

Method for estimating frequency offset of uplink control channel Download PDF

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CN108282421B
CN108282421B CN201710006422.3A CN201710006422A CN108282421B CN 108282421 B CN108282421 B CN 108282421B CN 201710006422 A CN201710006422 A CN 201710006422A CN 108282421 B CN108282421 B CN 108282421B
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symbol
despreading
time slot
frequency offset
value
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CN108282421A (en
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于小红
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Abstract

The application discloses a frequency offset estimation method of an uplink control channel, which comprises the following steps: setting a memory k for each user, storing the latest frequency offset value measured by the user within a set time, and if the frequency offset is positive, setting k to be 0; otherwise k is 1; receiving data of PRB where PUCCH format 2a or PUCCH format 2b is located, and performing data despreading aiming at each user; despreading the 1 st time slot symbol 1 to obtain H11, despreading the 1 st time slot symbol 5 to obtain G15, despreading the 2 nd time slot symbol 1 to obtain H21, and despreading the 2 nd time slot symbol 5 to obtain G25; calculating phase angle
Figure DDA0001203217130000012
And according to the k value pair
Figure DDA0001203217130000011
Correcting; and respectively calculating the channel estimation value of each other orthogonal frequency division multiplexing OFDM symbol by taking the channel estimation value of the symbol 1 in each time slot as a reference. By applying the technical scheme disclosed by the application, the problem of frequency offset estimation when the uplink control channel transmits Channel State Information (CSI) under a high-speed condition can be solved.

Description

Method for estimating frequency offset of uplink control channel
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method for estimating an uplink control channel frequency offset.
Background
In a communication system, doppler shift is caused by high-speed motion of a terminal. For example, if the terminal is driven at a speed of 300km/h and the carrier frequency is 2.6GHz, the maximum Doppler shift generated is approximately 722 Hz. In the uplink, the doppler shift caused by the movement of the terminal will be twice the maximum doppler shift at most, that is, when the terminal is running at 300km/h, the uplink shift can reach 1444Hz at most without considering the downlink synchronization error. Under the condition of the frequency offset, uplink data cannot be correctly received if some measures are not taken.
In the existing frequency offset estimation algorithm, some frequency offsets are estimated by using a pilot frequency, for example, in LTE, the frequency offset is estimated by using the phase difference between two columns of pilot frequencies in one subframe of a Physical Uplink Shared Channel (PUSCH); there are also techniques for performing frequency offset estimation in the time domain using a Cyclic Prefix (CP). However, the LTE uplink control channel is code division multiplexed by multiple users, and control information of multiple users is transmitted on the same Resource Block (RB), so that the frequency offset estimation cannot be performed by the above-mentioned conventional method, that is, the frequency offsets of multiple users in the LTE uplink control channel cannot be calculated, and therefore, the frequency offset compensation cannot be performed, which results in poor receiving performance of the LTE uplink control channel at a high speed.
Disclosure of Invention
The application provides a method for estimating frequency offset of an uplink control channel, which aims to solve the problem of frequency offset estimation when the uplink control channel transmits Channel State Information (CSI) at a high speed.
The application provides an uplink control channel frequency offset estimation method, which comprises the following steps:
setting a memory k for each user, storing the latest frequency offset value measured by the user within a set time, and if the frequency offset is positive, setting k to be 0; otherwise k is 1;
receiving data of a physical resource block PRB where a physical uplink control channel PUCCH format 2a or PUCCH format 2b is located, and performing data despreading aiming at each user;
despreading the 1 st time slot symbol 1 to obtain H11, despreading the 1 st time slot symbol 5 to obtain G15, despreading the 2 nd time slot symbol 1 to obtain H21, and despreading the 2 nd time slot symbol 5 to obtain G25;
calculating phase angle
Figure GDA0002517740180000021
And according to the k value pair
Figure GDA0002517740180000022
Correcting;
and respectively calculating the channel estimation value of each other orthogonal frequency division multiplexing OFDM symbol by taking the channel estimation value of the symbol 1 in each time slot as a reference.
Preferably, the value according to k is
Figure GDA0002517740180000023
The correcting comprises the following steps: if it is not
Figure GDA0002517740180000024
And k is 1, then
Figure GDA0002517740180000025
If it is not
Figure GDA0002517740180000026
And k is 0, then
Figure GDA0002517740180000027
In other cases
Figure GDA0002517740180000028
The value is unchanged.
Preferably, the calculating the channel estimation values of other OFDM symbols respectively based on the channel estimation value of symbol 1 in each timeslot includes:
calculating the phase difference between adjacent symbols:
Figure GDA0002517740180000029
according to
Figure GDA00025177401800000210
The channel estimate for each slot symbol 0 is calculated and so on.
According to the technical scheme, the method for estimating the frequency offset of the uplink control channel comprises the steps that a memory k is arranged for each user, the latest frequency offset value measured by the user within set time is stored, and if the frequency offset is positive, k is 0; otherwise k is 1; receiving data of PRB where PUCCH format 2a/2b is located, and carrying out data de-spreading for each user; despreading H11, G15, H21 and G25 by the symbol 1 and the symbol 5 of the 1 st and the 2 nd time slots respectively, and calculating the phase angle
Figure GDA00025177401800000211
Then according to the k value pair
Figure GDA00025177401800000212
Correcting; and the channel estimation value of the symbol 1 in each time slot is taken as a reference, and the channel estimation values of other orthogonal frequency division multiplexing OFDM symbols are respectively calculated, so that the problem of frequency offset estimation when the uplink control channel transmits CSI information under the high-speed condition can be solved.
Drawings
Fig. 1 is a schematic diagram of symbol occupancy of a conventional PUCCH format 2;
fig. 2 is a flowchart illustrating a method for estimating uplink control channel frequency offset according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
In LTE, the uplink control channel Physical Uplink Control Channel (PUCCH) format 2, 2a, 2b transmits Channel State Information (CSI) of the downlink channel. In PUCCH format 2, data occupies 5 symbols and pilot occupies 2 symbols in each slot, as shown in fig. 1: symbols 1 and 5 are used to transmit pilot and symbols 0, 2, 3, 4 and 6 are used to transmit data.
In PUCCH formats 2a and 2b, ACK/NACK information is transmitted at the pilot position of symbol 5 of each slot, and thus there is only one column of pilots per slot in PUCCH formats 2a and 2 b.
In LTE, downlink CSI information for multiple users is code division multiplexed together by spreading sequences and then transmitted on PUCCH 2X. In a high speed case, the reception performance of PUCCH 2X is degraded due to the influence of doppler shift, and CSI information of the user cannot be accurately obtained. Therefore, the invention provides a frequency offset estimation method when PUCCH2a and PUCCH2b are transmitted, so that channel information of high-speed users can be improved. The specific method is shown in fig. 2, and comprises the following steps:
step 1: each user sets a memory k, stores the latest frequency offset value measured by the user in a period of time, and if the frequency offset is positive, k is 0; otherwise k is 1.
Step 2: and receiving data of a Physical Resource Block (PRB) where the PUCCH format 2a/2b is located.
And step 3: data despreading is performed for each user. Here, data despreading and channel estimation are performed using the local sequence.
And 4, step 4: the 1 st slot symbol 1 is despread to obtain H11, the 1 st slot symbol 5 is despread to obtain G15, and the 2 nd slot symbol 1 and symbol 5 are despread to obtain H21 and G25, respectively.
And 5: performing correlation operations with H11 and G15, and H21 and G25 respectively, and summing the two to obtain a phase angle
Figure GDA0002517740180000031
Step 6: value pair according to k
Figure GDA0002517740180000032
The value is corrected, specifically, the following judgment is carried out: if it is not
Figure GDA0002517740180000033
And k is 1, then
Figure GDA0002517740180000034
If it is not
Figure GDA0002517740180000035
And k is 0, then
Figure GDA0002517740180000036
Other cases
Figure GDA0002517740180000037
The value is unchanged. Where pi represents the circumferential ratio pi.
And 7: calculating the phase difference between adjacent symbols:
Figure GDA0002517740180000038
and respectively calculating the channel estimation value of each other OFDM symbol by taking the channel estimation value of the symbol 1 in each time slot as a reference. For example, symbols 0, 2, 3 are calculated based on the channel estimate for symbol 1 of the 1 st slot,. . . And 6, a channel estimation value. As shown in the following formula:
Figure GDA0002517740180000039
and 8: and detecting the received CSI and the ACK/NACK information according to the channel estimation value.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (2)

1. A frequency offset estimation method of an uplink control channel is characterized by comprising the following steps:
setting a memory k for each user, storing the latest frequency offset value measured by the user within a set time, and if the frequency offset is positive, setting k to be 0; otherwise k is 1;
receiving data of a physical resource block PRB where a physical uplink control channel PUCCH format 2a or PUCCH format 2b is located, and performing data despreading aiming at each user;
despreading the 1 st time slot symbol 1 to obtain H11, despreading the 1 st time slot symbol 5 to obtain G15, despreading the 2 nd time slot symbol 1 to obtain H21, and despreading the 2 nd time slot symbol 5 to obtain G25;
calculating phase angle
Figure FDA0002648335660000011
And according to the k value pair
Figure FDA0002648335660000012
Correcting; the value according to k
Figure FDA0002648335660000013
The correcting comprises the following steps: if it is not
Figure FDA0002648335660000014
And k is 1, then
Figure FDA0002648335660000015
If it is not
Figure FDA0002648335660000016
And k is 0, then
Figure FDA0002648335660000017
In other cases
Figure FDA0002648335660000018
The value is unchanged;
and respectively calculating the channel estimation value of each other orthogonal frequency division multiplexing OFDM symbol by taking the channel estimation value of the symbol 1 in each time slot as a reference.
2. The method of claim 1, wherein:
the calculating the channel estimation values of other OFDM symbols respectively based on the channel estimation value of symbol 1 in each timeslot includes:
calculating the phase difference between adjacent symbols:
Figure FDA0002648335660000019
according to
Figure FDA00026483356600000110
Calculating a channel estimation value of each time slot symbol 0 according to
Figure FDA00026483356600000111
The channel estimate for each slot symbol 3 is calculated and so on.
CN201710006422.3A 2017-01-05 2017-01-05 Method for estimating frequency offset of uplink control channel Expired - Fee Related CN108282421B (en)

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CN110011945B (en) * 2019-04-22 2021-10-29 武汉虹信科技发展有限责任公司 PUCCH processing method and device
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