CN110535594B - Pilot sequence configuration method and device, electronic equipment and storage medium - Google Patents

Pilot sequence configuration method and device, electronic equipment and storage medium Download PDF

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CN110535594B
CN110535594B CN201811230279.7A CN201811230279A CN110535594B CN 110535594 B CN110535594 B CN 110535594B CN 201811230279 A CN201811230279 A CN 201811230279A CN 110535594 B CN110535594 B CN 110535594B
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pilot
sequence
ofdm
orthogonal
sequences
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CN110535594A (en
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张毅
肖悦
康洁思
严春林
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/0008—Wavelet-division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention relates to the technical field of wireless communication, and discloses a pilot sequence configuration method, a pilot sequence configuration device, electronic equipment and a storage medium, wherein the method is used for configuring a pilot sequence for a data frame to be transmitted, the data frame to be transmitted comprises a series of sub-frames, each sub-frame comprises at least two Orthogonal Frequency Division Multiplexing (OFDM) pilot symbols, each pilot symbol comprises a plurality of sub-carriers, and the pilot sequence configuration method comprises the following steps: selecting different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe; and correspondingly adding the selected orthogonal pilot sequences into subcarriers of at least two OFDM pilot symbols. The embodiment of the invention selects different pilot sequences for different OFDM pilot symbols, so that even if one pilot symbol has pilot collision, channel information can be obtained through other pilot symbols, and the channel information can be updated more accurately.

Description

Pilot sequence configuration method and device, electronic equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to a pilot sequence configuration method and device, electronic equipment and a storage medium.
Background
ZC (Zadoff-Chu) sequences have the following characteristics: 1. constant envelope property: the amplitude of the ZC sequence with any length is constant; 2. ideal periodic autocorrelation properties: after any ZC sequence is shifted by n bits, when n is not an integral multiple of the period of the ZC sequence, the shifted sequence is irrelevant to the original sequence; 3. good cross-correlation properties: the cross-correlation and partial correlation values are close to 0;4. low peak-to-average ratio characteristic: the ratio of the peak value to the mean value of a signal consisting of any ZC sequence is very low; 5. the ZC sequence remains after fourier transform: any ZC sequence is still a ZC sequence after Fourier forward and backward transformation. Based on these characteristics of ZC sequences, ZC sequences have been widely used in LTE (Long Term Evolution). The ZC sequence is used as a synchronous training sequence, a preamble sequence of a PRACH (Physical Random Access channel), a Demodulation reference signal (DMRS) sequence of an uplink and a downlink, and a ZC sequence is used as an SRS (Sounding reference signal) sequence to detect channel quality.
When a ZC sequence is used as a pilot sequence for channel estimation, if different users use the same pilot sequence and occupy the same time-frequency domain resource, pilot collision may occur, and the accuracy of channel estimation may be greatly reduced.
The inventor finds that at least the following problems exist in the prior art: in order to reduce the pilot collision probability, the conventional LTE standard generally adopts an OCC (Orthogonal Cover Code) manner to configure the pilot sequences, and although the OCC can reduce the pilot collision probability by increasing the number of Orthogonal pilot sequences, since the pilot sequences configured for different OFDM (Orthogonal Frequency Division Multiplexing) pilot symbols in each subframe of the data frame are basically equivalent in terms of channel estimation, when one of the pilot symbols collides with a pilot, the pilot collision occurs in the subframe, and therefore, the pilot collision probability is very high.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for configuring a pilot sequence, an electronic device, and a storage medium, in which different pilot sequences are selected for different OFDM pilot symbols, so that even if one pilot symbol has a pilot collision, channel information can be obtained through other pilot symbols, and thus the channel information can be updated more accurately.
In order to solve the above technical problem, an embodiment of the present invention provides a pilot sequence configuration method, configured to configure a pilot sequence for a data frame to be transmitted, where the data frame to be transmitted includes a series of sub-frames, each sub-frame includes at least two Orthogonal Frequency Division Multiplexing (OFDM) pilot symbols, and each pilot symbol has a plurality of sub-carriers, and the pilot sequence configuration method includes: selecting different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe; correspondingly adding the selected orthogonal pilot sequences into subcarriers of the at least two OFDM pilot symbols.
The embodiment of the present invention further provides a pilot sequence configuration device, configured to configure a pilot sequence for a data frame to be sent, where the data frame to be sent includes a series of sub-frames, each sub-frame includes at least two OFDM pilot symbols, and each pilot symbol has a plurality of sub-carriers, and the pilot sequence configuration device includes: a selecting module, configured to select different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe; and an adding module, configured to correspondingly add the selected orthogonal pilot sequence to subcarriers of the at least two OFDM pilot symbols.
An embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the pilot sequence configuration method as described above.
An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program is configured to implement the pilot sequence configuration method according to any one of claims 1 to 7 when executed by a processor.
Compared with the prior art, when a sending end configures a pilot frequency sequence for a data frame to be sent, the embodiment of the invention respectively selects different orthogonal pilot frequency sequences for each OFDM pilot frequency symbol in each subframe, and adds the selected orthogonal pilot frequency sequences to the subcarriers of the corresponding OFDM pilot frequency symbols. Therefore, when the receiving end carries out channel estimation, as long as one pilot frequency symbol is not collided, the channel estimation can be carried out according to the pilot frequency symbol which is not collided, in other words, because the pilot frequency sequence on each pilot frequency symbol in each subframe can be independently used for channel estimation, compared with the existing OCC pilot frequency collision prevention method, the pilot frequency collision probability can be further reduced, and the receiving end is favorable for updating the channel information more accurately.
As an embodiment, the selecting different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe specifically includes: presetting an orthogonal pilot sequence set; wherein, theThe set of orthogonal pilot sequences comprises NtA plurality of different orthogonal pilot sequences; and randomly selecting corresponding orthogonal pilot sequences for the at least two OFDM pilot symbols of each sub-frame from the orthogonal pilot sequence set.
As an embodiment, the randomly selecting a corresponding orthogonal pilot sequence for the at least two OFDM pilot symbols of each subframe from the orthogonal pilot sequence set specifically includes: randomly generating a set from 1 to NtThe random number of the OFDM symbol is used as a sequence index of an orthogonal pilot sequence corresponding to the at least two OFDM pilot symbols; and selecting corresponding orthogonal pilot sequences from the orthogonal pilot sequence set for the at least two OFDM pilot symbols according to the sequence indexes.
As an embodiment, the length of the orthogonal pilot sequence is one half of the number of subcarriers of the pilot symbol.
As an embodiment, the correspondingly adding the selected orthogonal pilot sequences to the subcarriers of the at least two OFDM pilot symbols specifically includes: generating a parity flag bit; and respectively adding the selected orthogonal pilot sequences to subcarriers corresponding to the positions of the subcarriers of the pilot symbols and the parity flag bits.
As an embodiment, the generating the parity flag bit is specifically: and randomly generating the parity flag bit.
As an embodiment, the orthogonal pilot sequences are ZC sequences.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a flowchart of a pilot sequence configuration method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a pilot sequence configuration method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a pilot sequence configuration method according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of the placement of orthogonal pilot sequences for 4 users according to the present invention;
FIG. 5 is a plot of BLER versus BER performance of channel estimation under different pilot sequence configuration methods;
fig. 6 is a schematic structural diagram of a pilot sequence configuration apparatus according to a fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic apparatus according to a fifth embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the invention relates to a pilot sequence configuration method, which is applied to electronic equipment with high-speed wireless communication performance, wherein the electronic equipment comprises but is not limited to a smart phone and vehicle-mounted video. The pilot sequence configuration method of the present embodiment is used for configuring a pilot sequence for a data frame to be transmitted, where the data frame to be transmitted includes a series of subframes, each subframe includes at least two orthogonal pilot multiplexing OFDM pilot symbols, and each pilot symbol has a plurality of subcarriers. Specifically, the method is applied to a MIMO (Multiple-Input Multiple-Output) -OFDM system, where a modulation mode of a data frame in the system is QPSK (Quadrature Phase Shift keying), a modulation order is M, one subframe of each data frame has 14 OFDM symbols, orthogonal pilot sequences are placed on the 4 th symbol and the 11 th symbol in one subframe, that is, one subframe has two pilot symbols, and the number of subcarriers of one OFDM pilot symbol is 72. However, the present embodiment does not specifically limit these methods, and any suitable modulation method, modulation order and data frame structure all belong to the protection scope of the present invention.
Referring to fig. 1, a pilot sequence allocation method according to the present embodiment includes:
step 101: different orthogonal pilot sequences are selected for at least two OFDM pilot symbols in each sub-frame.
Step 102: and correspondingly adding the selected orthogonal pilot sequences into subcarriers of at least two OFDM pilot symbols.
In step 101, different orthogonal pilot sequences may be set for at least two OFDM pilot symbols in each sub-frame in a configuration manner, for example, different pilot sequences may be dynamically set for each OFDM pilot symbol in each sub-frame according to an ID number of a cell, an identification number of a transmitting end, and the like. Different pilot sequences mean that each pilot sequence can be independently used for channel estimation.
In this embodiment, the orthogonal pilot sequence may adopt a ZC sequence, but is not limited thereto, and any applicable orthogonal pilot sequence is within the scope of the present invention.
In step 102, the selected orthogonal pilot sequence may be correspondingly added to the corresponding sub-carriers of the OFDM pilot symbols according to the length of the orthogonal pilot sequence.
Compared with the prior art, when the transmitting end configures the pilot frequency sequence for the data frame to be transmitted, the transmitting end selects different orthogonal pilot frequency sequences for each OFDM pilot frequency symbol in each subframe respectively, and adds the selected orthogonal pilot frequency sequences to the subcarriers of the corresponding OFDM pilot frequency symbols. Therefore, when the receiving end carries out channel estimation, as long as one pilot frequency symbol does not collide, the channel estimation can be carried out according to the pilot frequency symbol which does not collide, in other words, because the pilot frequency sequences on each pilot frequency symbol in each subframe can be independently used for channel estimation, compared with the existing OCC pilot frequency collision prevention method, the method can further reduce the probability of pilot frequency collision, thereby being beneficial to more accurately updating channel information by the receiving end.
The second embodiment of the present invention relates to a pilot sequence configuration method. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: the first embodiment configures different orthogonal pilot sequences for different OFDM pilot symbols in each sub-frame in a configuration manner. In the second embodiment of the present invention, different orthogonal pilot sequences are configured for different OFDM pilot sequences in each subframe by presetting an orthogonal pilot sequence set and randomly selecting from the orthogonal pilot sequence set.
Referring to fig. 2, a pilot sequence configuration method according to the present embodiment includes:
step 201: randomly generating a set from 1 to NtAs a sequence index of the orthogonal pilot sequence corresponding to the at least two OFDM pilot symbols.
Step 202: and selecting corresponding orthogonal pilot sequences from the orthogonal pilot sequence set for at least two OFDM pilot symbols according to the sequence indexes.
Step 203: and correspondingly adding the selected orthogonal pilot sequences into subcarriers of at least two OFDM pilot symbols.
In this embodiment, a group of N orthogonal pilot sequences may be generated by selecting an orthogonal pilot sequence generation algorithmtSo as to obtain a preset orthogonal pilot sequence set phi = { p1, p2, \8230;, pNtAnd each orthogonal pilot frequency sequence in the set phi is different. The number and length of the orthogonal pilot sequences in the aggregate Φ may be set according to actual needs, and are not described herein again.
In this embodiment, step 201 and step 202 randomly select corresponding orthogonal pilot sequences for at least two OFDM pilot symbols of each sub-frame from an orthogonal pilot sequence set. Specifically, in step 201, a group from 1 to N is randomly generatedtThe random number of (2) is used as a sequence index of an orthogonal pilot sequence corresponding to at least two OFDM pilot symbols, namely the value of each random number is 1 and Nt(i.e., the number of orthogonal pilot sequences in the set of orthogonal pilot sequences Φ). Specifically, when N istEqual to 24, each random number is any integer between 1 and 24, so as to pass throughThe random number may determine the orthogonal pilot sequence corresponding to the OFDM pilot symbol. The number of the random numbers may be the same as the number of the OFDM pilot symbols in each subframe. For example, when the number of OFDM pilot symbols in each subframe is two, the number of random numbers is also two. In step 202, the first random number may be used as a sequence index of a first OFDM pilot symbol in each subframe, that is, the orthogonal pilot sequence corresponding to the orthogonal pilot sequence set Φ is selected as the pilot sequence of the first OFDM pilot symbol according to a value of the first random number, for example, if the value of the first random number is 3, the 3 rd orthogonal pilot sequence in the orthogonal pilot sequence set Φ is used as the pilot sequence of the first OFDM pilot symbol. Similarly, the second random number is used as a sequence index of an orthogonal pilot sequence corresponding to the second OFDM pilot symbol in the subframe, so as to select the orthogonal pilot sequence for the second OFDM pilot symbol. If there are more OFDM pilot symbols in each sub-frame, then corresponding orthogonal pilot sequences are similarly chosen for the remaining OFDM pilot symbols.
It should be noted that, in practical application, different random number generation algorithms may be further respectively adopted to randomly select a pilot sequence for each OFDM pilot symbol in each subframe, for example, a random number is generated by a first random number generation algorithm as an index of the pilot sequence of a first OFDM pilot symbol, a random number is generated by a second random number generation algorithm as an index of the pilot sequence of a second OFDM pilot symbol, or more random numbers are generated by different random number generation methods similarly as indexes of the pilot sequences of more OFDM pilot symbols, where the random number generation algorithm corresponding to a subsequent pilot symbol needs to exclude the random numbers generated by the prior random number generation algorithm. The present embodiment is not limited in any way to randomly select the corresponding orthogonal pilot sequence for at least two OFDM pilot symbols of each subframe from the orthogonal pilot sequence set.
Compared with the prior art, the method and the device have the advantages that the pilot sequence index of each OFDM pilot symbol in the subframe is obtained by generating the random number, different pilot sequences can be configured for each OFDM pilot symbol in each subframe, so that a receiving end can perform channel estimation according to the pilot sequence carried by the subcarrier of each OFDM pilot symbol in each subframe, the pilot collision probability can be reduced, and the channel estimation accuracy is improved.
The third embodiment of the present invention relates to a pilot sequence configuration method. The third embodiment is an improvement on the first or second embodiment, and the main improvement lies in that: in the third embodiment, the placement positions of the pilot sequences in the subcarriers of the pilot symbols are further determined according to the generated parity flag bits, so that the difference of the pilot sequences configured by different OFDM pilot symbols in the subframe can be further improved.
In this embodiment, the length of each orthogonal pilot sequence in the preset orthogonal pilot sequence set Φ is half of the number of subcarriers of a pilot symbol. Referring to fig. 3, a pilot sequence configuration method according to the present embodiment includes:
step 301: different orthogonal pilot sequences are selected for at least two OFDM pilot symbols in each sub-frame.
Step 302: parity flag bits are randomly generated.
Step 303: and respectively adding the selected orthogonal pilot sequences to the subcarriers corresponding to the subcarrier positions and the parity flag bits of the pilot symbols.
In this embodiment, the selected orthogonal pilot sequences are correspondingly added to the subcarriers of at least two OFDM pilot symbols in steps 302 and 303. The parity flag bit can be denoted as i, the value of i can be 0 or 1, and the values of i and 1 can represent odd bits or even bits. The odd bits and the even bits herein refer to positions of a plurality of subcarriers of one OFDM pilot symbol. In step 302, the random generation of the parity bit by the transmitting end means that the parity bit generated by the transmitting end is variable, that is, the parity bit indicating an odd number may be generated, or the parity bit indicating an even number may be generated. However, in practical applications, the parity flag generated by one transmitting end may be the same all the time, that is, the parity flag indicating the odd number is generated all the time or the parity flag indicating the even number is generated all the time.
In step 303, according to the value of the odd-even flag, the orthogonal pilot sequence of each OFDM pilot symbol is mapped to the subcarrier with the odd subcarrier number or the subcarrier with the even subcarrier number. If the odd-even flag bit i =0, the pilot sequence may be mapped to the subcarrier with odd subcarrier number on the corresponding pilot symbol, and if the odd-even flag bit i =1, the pilot sequence may be mapped to the subcarrier with even subcarrier number on the corresponding pilot symbol.
Compared with the foregoing embodiments, the present embodiment randomly generates the parity flag bits, and adds the selected orthogonal pilot sequences to the subcarriers corresponding to the parity flag bits and the subcarrier positions of the pilot symbols, respectively, so as to further improve the difference between the pilot sequences of different pilot symbols, thereby further reducing the probability of pilot collision.
The effect of reducing the pilot collision probability of the pilot sequence configuration method according to an embodiment of the present invention will be described with reference to fig. 4. Please refer to fig. 4, which illustrates a schematic diagram of an orthogonal pilot sequence placement manner for k users according to an embodiment of the pilot sequence configuration method of the present invention, where k is 4, i.e., users 1 to 4, and each sub-frame has 2 OFDM pilot symbols. Each user (i.e. transmitting end) respectively adopts an implementation mode of the pilot frequency sequence configuration method of the invention to configure the pilot frequency sequence for the data frame to be transmitted, and the orthogonal pilot frequency sequence group of each subframe of 4 users is { x }1,1,x1,2},{x2,1,x2,2},{x3,1,x3,2},{x4,1,x4,2}. More specifically, the set of orthogonal pilot sequences Φ = { p1, p2, \8230;, p24} for each user, and the length of each orthogonal pilot sequence in the set Φ is 36, which is half of the number of subcarriers of one pilot symbol. In a subframe, for the first pilot symbol, each user randomly generates a set of random numbers from 1 to 24, and takes the value of the first random number as the index of the pilot sequence of the first pilot symbol, so as to obtain a sequence index value j = {1,5, 20, 16} of 4 users. Then each user rootAccording to the index j of the user, a corresponding pilot sequence x1,1= p1, x2,1= p5, x3,1= p20, x4,1= p16 is selected from the orthogonal pilot sequence set Φ as the pilot sequence of the first pilot symbol of the 4 users. The second pilot symbol is selected in a similar way to the pilot sequence of the first pilot symbol, specifically, for the second pilot symbol, each user takes the value of the second random number as the index of the pilot sequence of the second pilot symbol, so as to obtain the sequence index value j = {2,5, 18, 10} of 4 users. Then, each user selects a corresponding pilot sequence x1,2= p2, x2,2= p5, x3,2= p18, x4,2= p10 from the orthogonal pilot sequence set Φ according to its own index j, as a pilot sequence of the 4 users in the second pilot symbol. Thereby obtaining the orthogonal pilot sequence set of 4 users as { x1,1,x1,2},{x2,1,x2,2},{x3,1,x3,2},{x4,1,x4,2}。
Each user randomly generates an odd-even flag bit i, and if the odd-even flag bit i =0 of 2 users, the selected pilot frequency sequences are respectively mapped to subcarriers with odd-numbered subcarrier numbers of the 4 th pilot frequency symbol and the 11 th pilot frequency symbol; and if the parity flag bit i =1 of the other 2 users, mapping the selected pilot sequences to subcarriers with even subcarrier numbers of the 4 th pilot symbol and the 11 th pilot symbol respectively. Thereby completing the configuration of the pilot sequences of 4 users.
As can be seen from the above, since each user independently randomly selects the pilot sequence placed on the pilot symbol from the orthogonal pilot sequence set Φ, the probability that the pilot sequences configured by one pilot symbol of the sub-frame of any two users in the plurality of users are the same is very low, and the probability that the pilot sequences configured by two pilot symbols in one sub-frame are the same is further reduced. For example, if each subframe has two pilot symbols and the probability of pilot collision of 1 pilot symbol is 0.1, the probability of pilot collision on one subframe is 0.1 squared, and if each subframe has 3 pilot symbols, the probability of pilot collision on each subframe will be 0.1 cubed accordingly, i.e. the probability of pilot collision on one subframe is Q power of the probability of pilot collision on one pilot symbol, and Q is the number of pilot symbols of the subframe. In the OCC mode, as only one pilot symbol in one subframe has pilot collision, the corresponding subframe is considered to have pilot collision, so that the embodiment of the invention can further reduce the pilot collision probability.
Please refer to fig. 5, which is a performance comparison diagram of block Error Rate (BLER) and Bit Error Rate (Bit Error Rate, BER) for channel estimation by respectively configuring different pilot sequences for two OFDM pilot symbols in each subframe by using the pilot sequence configuration method according to the third embodiment of the present invention and using one pilot symbol and one pilot sequence for OCC for the two pilot symbols in the subframe when the mobile speed of the transmitting end is 50 kilometers per hour (km/h). From this it can be seen that the overall performance of the embodiments of the present invention is superior.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of this patent to add insignificant modifications or introduce insignificant designs to the algorithms or processes, but not to change the core designs of the algorithms and processes.
A fourth embodiment of the present invention relates to a pilot sequence configuration apparatus 600, configured to configure a pilot sequence for a data frame to be sent, where the data frame to be sent includes a series of sub-frames, each sub-frame includes at least two OFDM pilot symbols, and each pilot symbol has several sub-carriers. As shown in fig. 6, pilot sequence mapping apparatus 600 according to the present embodiment includes:
a selecting module 601, configured to select different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe; and
an adding module 602, configured to correspondingly add the selected orthogonal pilot sequence to subcarriers of at least two OFDM pilot symbols.
In practical applications, the selecting module 601 mayPresetting an orthogonal pilot sequence set; wherein, the orthogonal pilot frequency sequence set comprises NtDifferent orthogonal pilot sequences, which can be ZC sequences, are used in the present embodiment; and randomly selecting corresponding orthogonal pilot sequences for at least two OFDM pilot symbols of each sub-frame from the orthogonal pilot sequence set. Further, randomly selecting a corresponding orthogonal pilot sequence for at least two OFDM pilot symbols of each subframe from the orthogonal pilot sequence set specifically includes: randomly generating a set from 1 to NtThe random number of the OFDM pilot symbol is used as a sequence index of an orthogonal pilot sequence corresponding to at least two OFDM pilot symbols; and selecting corresponding orthogonal pilot sequences from the orthogonal pilot sequence set for at least two OFDM pilot symbols according to the sequence indexes.
Further, the length of the available orthogonal pilot sequence in this embodiment may be one half of the number of subcarriers of the pilot symbol. The adding module 602 specifically includes: generating a parity flag bit; and respectively adding the selected orthogonal pilot sequences to the subcarriers corresponding to the subcarrier positions and the parity flag bits of the pilot symbols. The parity flag bit may be generated randomly.
Compared with the prior art, the method and the device have the advantages that when the sending end configures the pilot frequency sequence for the data frame to be sent, different orthogonal pilot frequency sequences are respectively selected for each OFDM pilot frequency symbol in each subframe, and the selected orthogonal pilot frequency sequences are added to the subcarriers of the corresponding OFDM pilot frequency symbols. Therefore, when the receiving end carries out channel estimation, as long as one pilot frequency symbol is not collided, the channel estimation can be carried out according to the pilot frequency symbol which is not collided, in other words, because the pilot frequency sequence on each pilot frequency symbol in each subframe can be independently used for channel estimation, compared with the existing OCC pilot frequency collision prevention method, the pilot frequency collision probability can be further reduced, and the receiving end is favorable for updating the channel information more accurately. And the odd-even flag bit is randomly generated, and the selected orthogonal pilot frequency sequences are respectively added to the sub-carriers corresponding to the sub-carrier positions of the pilot frequency symbols and the odd-even flag bit, so that the difference of the pilot frequency sequences of different pilot frequency symbols can be further improved, and the probability of pilot frequency collision is further reduced.
It should be understood that this embodiment is an example of the apparatus corresponding to the first, second, or third embodiment, and may be implemented in cooperation with the first, second, or third embodiment. The related technical details mentioned in the first, second or third embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first, second, or third embodiment.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, a unit which is less closely related to solving the technical problem proposed by the present invention is not introduced in the present embodiment, but it does not indicate that no other unit exists in the present embodiment.
A fifth embodiment of the present invention relates to an electronic device, such as a smartphone or a car audio/video device having a high-speed wireless communication capability. The present embodiment is not particularly limited as to the type of the electronic device. As shown in fig. 7, the electronic device of this embodiment includes at least one processor 701; and a memory 702 communicatively coupled to the at least one processor 701; wherein the memory 702 stores instructions executable by the at least one processor 701 to enable the at least one processor 701 to perform a pilot sequence configuration method as described above.
Where the memory and processor are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting together one or more of the various circuits of the processor and the memory. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium through an antenna, which further receives the data and transmits the data to the processor.
The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. While the memory may be used to store data used by the processor in performing operations.
A sixth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program realizes the above-described method embodiments when executed by a processor.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (9)

1. A method for configuring a pilot sequence, configured to configure a pilot sequence for a data frame to be transmitted, where the data frame to be transmitted includes a series of sub-frames, each sub-frame includes at least two OFDM pilot symbols, and each pilot symbol has a number of sub-carriers, and the method for configuring a pilot sequence includes:
selecting different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe;
correspondingly adding the selected orthogonal pilot frequency sequence into the subcarriers of the at least two OFDM pilot frequency symbols;
the correspondingly adding the selected orthogonal pilot sequence to the subcarriers of the at least two OFDM pilot symbols specifically includes:
generating a parity flag bit;
and respectively adding the selected orthogonal pilot sequences to subcarriers corresponding to the positions of the subcarriers of the pilot symbols and the parity flag bits.
2. The method according to claim 1, wherein the selecting different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe specifically includes:
presetting an orthogonal pilot sequence set; wherein the set of orthogonal pilot sequences comprises NtA plurality of different orthogonal pilot sequences;
and randomly selecting corresponding orthogonal pilot sequences for the at least two OFDM pilot symbols of each sub-frame from the orthogonal pilot sequence set.
3. The method as claimed in claim 2, wherein the randomly selecting the corresponding orthogonal pilot sequence for the at least two OFDM pilot symbols of each sub-frame from the set of orthogonal pilot sequences comprises:
randomly generating a set from 1 to NtThe random number of the OFDM symbol is used as a sequence index of an orthogonal pilot sequence corresponding to the at least two OFDM pilot symbols;
and selecting corresponding orthogonal pilot frequency sequences from the orthogonal pilot frequency sequence set for the at least two OFDM pilot frequency symbols according to the sequence indexes.
4. The method of any of claims 1 to 3, wherein the length of the orthogonal pilot sequence is one half of the number of subcarriers of the pilot symbol.
5. The method for configuring pilot sequences according to claim 1, wherein the generating parity flag bits specifically include: and randomly generating the parity flag bit.
6. The method of claim 1, wherein the orthogonal pilot sequence is a ZC sequence.
7. A pilot sequence configuration apparatus, configured to configure a pilot sequence for a data frame to be transmitted, where the data frame to be transmitted includes a series of sub-frames, each sub-frame includes at least two orthogonal frequency division multiplexing, OFDM, pilot symbols, and each pilot symbol has a number of sub-carriers, and the pilot sequence configuration apparatus includes:
a selecting module, configured to select different orthogonal pilot sequences for at least two OFDM pilot symbols in each subframe; and
an adding module, configured to correspondingly add the selected orthogonal pilot sequence to subcarriers of the at least two OFDM pilot symbols;
the adding module is further used for generating a parity flag bit; and respectively adding the selected orthogonal pilot sequences to the subcarriers corresponding to the subcarrier positions and the parity flag bits of the pilot symbols.
8. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a pilot sequence configuration method as claimed in any one of claims 1 to 6.
9. A storage medium storing a computer program, wherein the computer program when executed by a processor implements the pilot sequence configuration method according to any one of claims 1 to 6.
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EP2874363A1 (en) * 2013-11-14 2015-05-20 Alcatel Lucent A method for allocating a pilot sequence comprising cancellation carriers for sidelobe reduction
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