CN110299980B - Method, device and system for transmitting reference signal - Google Patents
Method, device and system for transmitting reference signal Download PDFInfo
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- CN110299980B CN110299980B CN201810247807.3A CN201810247807A CN110299980B CN 110299980 B CN110299980 B CN 110299980B CN 201810247807 A CN201810247807 A CN 201810247807A CN 110299980 B CN110299980 B CN 110299980B
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- 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
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- 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
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- 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
Abstract
The embodiment of the application discloses a method and a device for transmitting reference signals, wherein the method comprises the following steps: generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block; the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1; the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, wherein L is smaller than N; and transmitting the pilot signal. In the embodiment of the application, the pilot sequence corresponding to the second time-frequency pilot block is expanded, and then the pilot signal is generated based on the expanded pilot sequence (i.e., the pilot sequence corresponding to the first time-frequency pilot block), so that the number of the original pilot sequences is increased, i.e., the number of pilot frequencies (i.e., pilot frequency resources) which can be pre-configured is increased, thereby reducing the collision probability of the pilot frequency resources and improving the system performance.
Description
Technical Field
The present application relates to the field of wireless communications, and more particularly, to a method, apparatus, and system for transmitting reference signals.
Background
Demodulation Reference Signal (DMRS) is an important Reference Signal and can be used for channel estimation or multi-user detection.
In a DMRS-based transmission mode in a Long Term Evolution (LTE) system, a control channel or a data channel generally includes DMRS symbols and data symbols; whether the DMRS resources are uplink or downlink, DMRS resources need to be configured; for example, a 4 th last Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) symbol for each slot is configured as a DMRS symbol, and a pilot sequence adopted is a ZC (Zadoff-Chu) sequence.
Disclosure of Invention
The application provides a method, a device and a system for transmitting reference signals, which can increase the pre-configured pilot frequency, thereby reducing the collision probability of pilot frequency resources.
An embodiment of the present application provides a method for transmitting a reference signal, including:
generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, wherein L is smaller than N;
and transmitting the pilot signal.
Optionally, the j-th part of the pilot sequence corresponding to the first time-frequency pilot block is obtained by multiplying the i-th element of the spreading sequence by all elements of the pilot sequence corresponding to the second time-frequency pilot block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I.
Optionally, the first time-frequency pilot block includes L × J time-domain symbols.
Optionally, the pilot sequence corresponding to the first time frequency pilot block includes at least one of:
a pilot frequency sequence is obtained by time domain expansion of the pilot frequency sequence corresponding to the second time frequency pilot frequency block;
and time domain spreading a pilot frequency sequence obtained by a sequence orthogonal to the pilot frequency sequence corresponding to the second time frequency pilot frequency block.
Optionally, the sequence orthogonal to the pilot sequence corresponding to the second time-frequency pilot block is determined according to cyclic shift and the pilot sequence corresponding to the second time-frequency pilot block.
Optionally, the time domain resource position of the pilot sequence corresponding to the first time frequency pilot block is any of:
the first N time domain symbols of each time slot, the first N time domain symbols of each two time slots;
optionally, the frequency domain resource position of the pilot sequence is in a comb structure.
Optionally, the pilot sequence corresponding to the first time frequency pilot block includes any one of:
a complex sequence; a Walsh sequence; discrete fourier sequences; a ZC sequence; a PN sequence.
Optionally, the elements of the complex sequence are a + bj, and a and b are integers.
Alternatively to this, the first and second parts may,
a is 1, b is 0;
or, a is-1 and b is 0;
or, a is 0 and b is 1;
or a is 0 and b is-1.
An embodiment of the present application provides a method for transmitting a reference signal, including:
receiving a pilot signal; detecting all the pre-configured pilot frequencies to obtain pilot frequency sequences in the pilot signals;
the pilot frequency comprises a first time frequency pilot frequency block and a pilot frequency sequence corresponding to the first time frequency pilot frequency block, wherein the first time frequency pilot frequency block comprises N time domain symbols, and N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot block includes L time-domain symbols, L being less than N.
Optionally, the method further includes:
and determining a transmitting terminal for transmitting the pilot signal according to the pilot frequency of the detected pilot frequency sequence.
Optionally, the determining, according to the pilot of the detected pilot sequence, the sending terminal for transmitting the pilot signal includes:
and searching the sending terminal corresponding to the pilot frequency of the detected pilot frequency sequence in the corresponding relation between the sending terminal and the pilot frequency.
Optionally, the j-th part of the pilot sequence is obtained by multiplying the spreading sequence by the i-th element of all elements of the pilot sequence corresponding to the second time-frequency pilot block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I.
Optionally, the detecting all the pre-configured pilots to obtain the pilot sequences in the pilot signals includes:
detecting 4NX/I pre-configured pilot frequencies to obtain a pilot frequency sequence in a pilot frequency signal;
or detecting 6NX/I pre-allocated pilots to obtain a pilot sequence in the pilot signal; wherein X is the number of spreading sequences, X is greater than or equal to 2, and I is the length of the spreading sequences.
Optionally, the pilot sequence corresponding to the first time frequency pilot block includes at least one of:
a pilot frequency sequence is obtained by time domain expansion of the pilot frequency sequence corresponding to the second time frequency pilot frequency block;
and time domain spreading a pilot frequency sequence obtained by a sequence orthogonal to the pilot frequency sequence corresponding to the second time frequency pilot frequency block.
An embodiment of the present application provides an apparatus for transmitting a reference signal, including:
the generating module is used for generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block;
a sending module, configured to send the pilot signal;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot block includes L time-domain symbols, L being less than N.
An embodiment of the present application provides an apparatus for transmitting a reference signal, including:
a receiving module for receiving a pilot signal;
the detection module is used for detecting all the pre-configured pilot frequencies to obtain pilot frequency sequences in the pilot signals;
the pilot frequency comprises a first time frequency pilot frequency block and a pilot frequency sequence corresponding to the first time frequency pilot frequency block, wherein the first time frequency pilot frequency block comprises N time domain symbols, and N is an integer greater than 1;
the pilot sequence corresponding to the first time-frequency pilot frequency block can be obtained from the pilot sequence corresponding to the second time-frequency pilot frequency block; the second time-frequency pilot block includes L time-domain symbols, L being less than N.
An embodiment of the present application provides an apparatus for transmitting a reference signal, which includes a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the method for transmitting a reference signal is implemented.
Embodiments of the present application propose a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of any of the above-mentioned methods of transmitting reference signals, or the steps of any of the methods of transmitting reference signals according to claims 11 to 16.
The embodiment of the application comprises the following steps: generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block; the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1; the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, and L is less than N; a pilot signal is transmitted. According to the method and the device, the pilot sequence corresponding to the second time-frequency pilot frequency block is expanded, and then the pilot signals are generated based on the expanded pilot sequence (namely the pilot sequence corresponding to the first time-frequency pilot frequency block), so that the number of the original pilot sequences is increased, namely the number of pilot frequencies (namely pilot frequency resources) which can be pre-configured is increased, the collision probability of the pilot frequency resources is reduced, and the system performance is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present application;
FIG. 2 is a diagram of a second time-frequency pilot block according to an embodiment of the present application;
fig. 3 (a) is a first schematic diagram illustrating time domain resource locations of a first time frequency pilot block according to an embodiment of the present application;
fig. 3 (b) is a diagram illustrating a time domain resource location of a first time frequency pilot block according to an embodiment of the present application;
fig. 4 (a) is a schematic diagram of a time domain resource location of a first time frequency pilot block according to an embodiment of the present application;
FIG. 4 (b) is a diagram of a time domain resource location of a first time frequency pilot block according to an embodiment of the present application;
fig. 4 (c) is a diagram illustrating a time domain resource location of a first time frequency pilot block according to an embodiment of the present application;
fig. 5 (a) is a first schematic diagram illustrating frequency-domain resource locations of a first time-frequency pilot block according to an embodiment of the present application;
fig. 5 (b) is a schematic diagram of frequency domain resource locations of a first time-frequency pilot block according to an embodiment of the present application;
fig. 5 (c) is a schematic diagram illustrating frequency-domain resource locations of a first time-frequency pilot block according to an embodiment of the present application;
fig. 6 is a flowchart of a method for transmitting a reference signal according to another embodiment of the present application;
fig. 7 is a flowchart of a method for transmitting a reference signal according to another embodiment of the present application;
fig. 8 is a flowchart of a method for transmitting a reference signal according to another embodiment of the present application;
fig. 9 is a schematic structural diagram of an apparatus for transmitting a reference signal according to another embodiment of the present application;
fig. 10 is a schematic structural diagram of an apparatus for transmitting a reference signal according to another embodiment of the present application;
fig. 11 is a schematic structural diagram of a system for transmitting a reference signal according to another embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
For some harsh scenario requirements, in order to ensure the performance of channel estimation, more time domain resources or frequency domain resource overhead may be generally adopted to place the pilot sequence, but this may result in lower spectrum efficiency. For a scheduling-free scene with a large number of users, when the users randomly select pilot frequency resources (including time domain resources, frequency domain resources and pilot frequency sequences), the collision probability is high due to the limited pilot frequency resources.
Referring to fig. 1, an embodiment of the present application provides a method for transmitting a reference signal, including:
In an embodiment of the present application, the pilot sequence corresponding to the first time-frequency pilot block is obtained from a pilot sequence corresponding to a second time-frequency pilot block.
The second time-frequency pilot frequency block comprises L time domain symbols, each time domain symbol comprises m Resource Element (RE) symbols, and L and m are integers greater than or equal to 1. For example, a typical second time-frequency pilot block includes 1 time-domain symbol, and each time-domain symbol includes 12 RE symbols, or 6 RE symbols, or 3 RE symbols. L and m can also be other positive integers. As shown in fig. 2, the second time-frequency pilot block includes 1 time-domain symbol. In fig. 2, the white time domain symbols are data symbols, and the grey time domain symbols are reference symbols or pilot symbols.
The time resource location of the time domain symbol comprised by the second time-frequency pilot block may be any location, for example, as shown in fig. 2, the time domain symbol comprised by the second time-frequency pilot block is located in the 4 th symbol in each time slot.
The time resource locations of different time symbols in the second time-frequency pilot block may be continuous or discontinuous.
In the embodiments of the present application, the pilot sequence corresponding to the first time-frequency pilot block may be obtained in a variety of ways according to the pilot sequence corresponding to the second time-frequency pilot block.
For example, the pilot sequence corresponding to the first time frequency pilot block includes at least one of the following:
a pilot frequency sequence is obtained by time domain expansion of the pilot frequency sequence corresponding to the second time frequency pilot frequency block;
and time domain spreading a pilot frequency sequence obtained by a sequence orthogonal to the pilot frequency sequence corresponding to the second time frequency pilot frequency block.
The j-th part of the pilot sequence obtained by time-domain spreading the pilot sequence corresponding to the second time-frequency pilot frequency block may be obtained by multiplying the i-th element of the spreading sequence by all elements of the pilot sequence corresponding to the second time-frequency pilot frequency block.
The j-th part of the pilot sequence obtained by time-domain spreading the pilot sequence corresponding to the second time-frequency pilot frequency block may be obtained by multiplying the i-th element of the spreading sequence by all elements of a sequence orthogonal to the pilot sequence corresponding to the second time-frequency pilot frequency block.
Wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I.
For another example, the j-th part of the pilot sequence corresponding to the first time-frequency pilot block is obtained by multiplying the i-th element of the spreading sequence by all elements of the pilot sequence corresponding to the second time-frequency pilot block.
The pilot sequence corresponding to the first time-frequency pilot block can be regarded as a hierarchical structure or a secondary sequence structure, that is, the obtained pilot sequence is formed by spreading two or more than two short sequences. For example, a pilot sequence with length of 12 is spread by a spreading sequence with length of 4 to obtain a pilot sequence with length of 48, and the pilot sequence with length of 48 has a hierarchical structure, i.e. the pilot sequence with length of 48 can be regarded as 4 parts, part 1 is the product of the pilot sequence with length of 12 times the 1 st element of the spreading sequence with length of 4, part 2 is the product of the pilot sequence with length of 12 times the 2 nd element of the spreading sequence with length of 4, part 3 is the product of the pilot sequence with length of 12 times the 3 rd element of the spreading sequence with length of 4, and part 4 is the product of the pilot sequence with length of 12 times the 4 th element of the spreading sequence with length of 4.
The method has the advantages that the pilot sequence corresponding to the first time-frequency pilot block can provide more pilot frequencies relative to the pilot sequence corresponding to the second time-frequency pilot block, and the pilot sequence corresponding to the first time-frequency pilot block is thinned in the time domain, so that the overhead of the pilot sequence corresponding to the second time-frequency pilot block can be the same as that of the pilot sequence corresponding to the second time-frequency pilot block, and even the overhead is lower.
The method has the advantages that the pilot frequency sequence corresponding to the first time frequency pilot frequency block has a hierarchical structure, and the hierarchical structure can greatly reduce detection complexity, namely the hierarchical structure enables a receiver to perform hierarchical detection, namely the detection problem of the pilot frequency sequence corresponding to the first time frequency pilot frequency block is simplified into the detection problems of a plurality of short sequences. As an example, when detecting the pilot sequence with the length of 48, the first step is: the first, second, third, and fourth portions of the pilot sequence may be detected in parallel; the second step is that: and performing correlation operation on the correlation value obtained in the first step and the spreading sequence to obtain a detection value.
In the embodiments of the present application, the specific form of the spreading sequence is not limited. For example, the spreading sequence used for pilot spreading may employ a spreading sequence used for spreading of data symbols. The method can use the spreading sequence to do user discovery, and simplifies the realization of the receiver.
The following list of 20 possible values of the spreading sequence is merely an example, and is not intended to limit the specific values of the spreading sequence.
{1 1 1 1}；{1-1 1-1}；{1 1-1-1}；{1-1-1 1}；{1-i i 1}；{1 i i-1}；
{1-i-i-1}；{1i-i 1}；{1-1-i-i}；{1 1-i i}；{1-1i i}；{1 1i-i}；
{1 i-1 i}；{1-i-1-i}；{1 i 1-i}；{1-i 1 i}；{1 0 0 0}；{0 1 0 0}；
{0 0 1 0}；{0 0 0 1}。
In the embodiment of the present application, on the premise of not increasing the overhead of the pilot sequence, the pilot sequence is extended, and the number of the original pilot sequence is increased, for example, the original pilot sequence with the length of 12 may provide 12 pilots, and after being extended, 12 × 20=240 pilots may be provided, so that the collision probability of the pilot resources is reduced, and the system performance is improved.
In the embodiment of the application, the pilot frequency sequence can be expanded by increasing the overhead of the pilot frequency sequence, so that the number of the original pilot frequency sequence is increased, and the collision probability of the pilot frequency resource is reduced.
The first time frequency pilot block includes N of the time domain symbols. For example, the first time pilot block includes L × J of the time domain symbols.
For example, the second time-frequency pilot block comprises 1 time-domain symbol, spreading sequence(s) 1 ，s 2 ) Has a length of 2, the first time frequency pilot block comprises 2 time domain symbols, that is, as shown in fig. 3 (a) and 3 (b), the 1 st part (i.e., the 1 st time domain symbol) of the first time frequency pilot block is all elements of the second time frequency pilot block multiplied by the 1 st element s of the spreading sequence 1 The 2 nd portion (i.e., the 2 nd time domain symbol) of the first time frequency pilot block is the multiplication of all elements of the second time frequency pilot block by the 2 nd element s of the spreading sequence 2 . In the figure, the white time domain symbols are data symbols, and the grey time domain symbols are reference symbols or pilot symbols.
As another example, the second time-frequency pilot block includes 1 time-domain symbol, the spreading sequence(s) 1 ，s 2 ，s 3 ) Is 3, then the first time frequency pilot block includes 3 time domain symbols,that is, portion 1 (i.e., the 1 st time domain symbol) of the first time frequency pilot block is the multiplication of all elements of the second time frequency pilot block by the 1 st element s of the spreading sequence 1 The 2 nd portion (i.e., the 2 nd time domain symbol) of the first time frequency pilot block is the multiplication of all elements of the second time frequency pilot block by the 2 nd element s of the spreading sequence 2 The 3 rd part (i.e. the 3 rd time domain symbol) of the first time frequency pilot block is the multiplication of all elements of the second time frequency pilot block by the 3 rd element s of the spreading sequence 3 。
The time domain resource location of the time domain symbol included in the first time domain pilot block is not limited in the embodiments of the present application, that is, the time domain resource location of the time domain symbol included in the first time domain pilot block may be any location. For example, the time domain resource position of the pilot sequence corresponding to the first time frequency pilot block is any one of the following: the first N time domain symbols of each slot, the first N time domain symbols of every two slots.
As shown in fig. 4 (a), the time domain resource positions of the 4 time domain symbols included in the first time frequency pilot block are from 1 st time domain symbol to 4 th time domain symbol of each slot; as shown in fig. 4 (b), the time domain resource positions of the 4 time domain symbols included in the first time frequency pilot block are from 1 st time domain symbol to 4 th time domain symbol of every two time slots. As shown in fig. 4 (c), the time domain resource positions of the 4 time domain symbols included in the first time frequency pilot block are the first two time domain symbols of the odd number of slots and the first two time domain symbols of the even number of slots. In the figure, the white time domain symbols are data symbols, and the grey time domain symbols are reference symbols or pilot symbols.
The time domain resource location of the time domain symbol contained in the first time frequency pilot block can be represented by a pilot start location plus a location offset. For example, as shown in fig. 3 (a), the pilot start position of the time resource position of the time domain symbol included in the first time/frequency pilot block is 3, the position offset is 0 and 1, and the period is 1 slot (slot). As shown in fig. 3 (b), the pilot start position of the time domain resource position of the time domain symbol included in the first time frequency pilot block is 3, the position offset is 0 and 3, and the period is 1 slot. The pilot start position of the time domain resource position of the time domain symbol included in the first time frequency pilot block shown in fig. 4 (a) is 0, the position offsets are 0,1,2 and 3, and the period is 1 slot. As shown in fig. 4 (b), the pilot start position of the time domain resource position of the time domain symbol included in the first time/frequency pilot block is 0, the position offsets are 0,1,2 and 3, and the period is 2 slots. The pilot start position of the time domain resource position of the time domain symbol included in the first time frequency pilot block shown in fig. 4 (c) is 0, the position offsets are 0,1,14 and 15, and the period is 2 slots.
The time domain resource locations of different time domain symbols in the first time frequency pilot block may be continuous or discontinuous. For example, as shown in fig. 3 (a), the time domain resource positions of the 2 time domain symbols included in the first time frequency pilot block are consecutive, i.e., the 4 th time domain symbol and the 5 th time domain symbol of each slot. As shown in fig. 3 (b), the time domain resource locations of the 2 time domain symbols included in the first time frequency pilot block are non-consecutive, i.e. the 4 th time domain symbol and the 7 th time domain symbol of each slot.
Wherein, the frequency domain resource position of the pilot frequency sequence is a comb structure. The smaller the interval of the sub-carriers for placing the pilot RE symbols in the comb structure is, the higher the channel estimation precision is, and the better the system performance is.
For example, the frequency domain resource location of the pilot sequence is a comb structure as shown in fig. 5 (a), i.e. one pilot sequence places one pilot RE symbol every 1 subcarrier in 12 subcarriers in the frequency domain.
For another example, the frequency domain resource position of the pilot sequence is a comb structure as shown in fig. 5 (b), that is, one pilot sequence places one pilot RE symbol every 2 subcarriers in 12 subcarriers in the frequency domain; or, one pilot RE symbol is placed every other 1 subcarrier in 12 subcarriers of the frequency domain for the first time domain symbol and the second time domain symbol, and one pilot RE symbol is placed every other 2 subcarriers in 12 subcarriers of the frequency domain for the third time domain symbol and the fourth time domain symbol.
For another example, the frequency domain resource position of the pilot sequence is a comb structure as shown in fig. 5 (c), and one pilot RE symbol is placed in every 1 subcarrier among 12 subcarriers in the frequency domain; alternatively, pilot RE symbols are placed every 2 subcarriers in the frequency domain 12 subcarriers.
And determining the orthogonal sequence of the pilot sequence corresponding to the second time-frequency pilot frequency block according to the cyclic shift and the pilot sequence corresponding to the second time-frequency pilot frequency block.
For example, the pilot sequence corresponding to the second time-frequency pilot block is a ZC sequence, and its cyclically shifted sequence can be represented as r (n) = e jan e jφ(n)π/4 Where a is an integer and represents the step size of cyclic shift, and the value of phi (n) is shown in table 1.
TABLE 1
And the sequence r (n) is mutually orthogonal with the pilot frequency sequence corresponding to the second time-frequency pilot frequency block.
In an embodiment of the present application, a pilot sequence corresponding to a first time frequency pilot block includes any one of: a sequence of complex numbers; walsh (Walsh) sequences; a discrete fourier sequence; a ZC sequence; a PN sequence.
The embodiment of the present application does not limit the specific form of the elements of the complex sequence, for example, the real part and the imaginary part of the elements of the complex sequence are both integers, that is, the elements of the complex sequence are a + bj, and a and b are integers.
For example, a is 1 and b is 0;
or, a is-1 and b is 0;
or a is 0 and b is 1;
or a is 0 and b is-1.
For example, one pilot sequence corresponding to the first time frequency pilot block may be a ZC sequence or PN sequence with a length of 12, and the other pilot sequences corresponding to the first time frequency pilot block may be orthogonal sequences of the ZC sequence or PN sequence with a length of 12.
For another example, one pilot sequence corresponding to the first time-frequency pilot block may be a ZC sequence or a PN sequence with a length of 8, and the other pilot sequences corresponding to the first time-frequency pilot block may be orthogonal sequences of the ZC sequence or the PN sequence with a length of 8.
For another example, one pilot sequence corresponding to the first time-frequency pilot block may be a ZC sequence or a PN sequence with a length of 8, and the other pilot sequences corresponding to the first time-frequency pilot block are low-correlation non-orthogonal sequences of the ZC sequence or the PN sequence with a length of 8.
The correlation operation between the two sequences is dot multiplication of the two sequences, that is, the elements corresponding to the two sequences are multiplied and added.
The correlation between three or more sequences is the average of the results of the correlation operation between any two sequences.
When the correlation is less than a preset threshold (e.g., 0.5), it is considered to be low;
when the correlation is greater than or equal to a preset threshold, it is considered to be a high correlation.
In an embodiment of the present application, the reference signal corresponding to the pilot sequence corresponding to the first time frequency pilot block may be represented as:
wherein the content of the first and second substances,
wherein k =4n +2k '+ delta or k =6n + k' + delta,
wherein, P j Which represents the jth pilot sequence, is,
a reference signal corresponding to the jth pilot sequence corresponding to the first time frequency pilot block,
is a reference signal, beta, corresponding to the jth pilot sequence corresponding to the second time-frequency pilot block DMRS As a power parameter, w f (k') is a parameter associated with a pilot frequency Orthogonal Cover Code (OCC)Number, w t (l') is a parameter related to the pilot time domain OCC,
for the jth pilot sequence or the precoded jth pilot sequence, k' and delta are parameters related to the pilot frequency domain position k,
is the pilot starting position, l' is the position offset based on the pilot starting position, and s is the length of the spreading sequence.
Wherein, w t (l') may be any one of i, -1, -i, w t (0) And w t (1) The correlation of the composed length-2 sequences is small.
The pilot start position may be any position, for example, any one of 0 to 13.
Wherein, for example, the element in the spreading sequence may be one of i, -i,1, -1, and a set of spreading sequences with length 4 is as described in the previous embodiment.
An example of an alternative specific value is shown in table 2, where k '=0,1, l' =0,1 in table 2.
TABLE 2
In this embodiment, the pilot sequence corresponding to the second time-frequency pilot block is expanded, and then the pilot signal is generated based on the expanded pilot sequence (i.e., the pilot sequence corresponding to the first time-frequency pilot block), so that the number of the original pilot sequences is increased, that is, the number of the pilot carriers (i.e., the pilot resources) that can be pre-configured is increased, thereby reducing the collision probability of the pilot resources and improving the system performance.
Referring to fig. 6, another embodiment of the present application provides a method for transmitting a reference signal, including:
601, generating a pilot signal according to a pilot sequence of a pilot;
In an embodiment of the present application, the pilot includes a first time-frequency pilot block and a pilot sequence corresponding to the first time-frequency pilot block, where the pilot sequence corresponding to the first time-frequency pilot block is obtained according to a pilot sequence corresponding to a second time-frequency pilot block.
In the embodiment of the present application, reference may be made to the description of the foregoing embodiment for the description of the first time frequency pilot block and the second time frequency pilot block, which is not described herein again.
In the embodiment of the application, 4NX/I configured pilot frequencies are provided, or 6NX/I configured pilot frequencies are provided; wherein, X is the number of the spreading sequences, namely the number of the possible values of the spreading sequences, X is more than or equal to 2, and I is the length of the spreading sequences.
For example, there are 12 configured pilots, where the first time-frequency pilot block of the pilot includes 2 consecutive time-domain symbols, and the starting position is the 1 st time-domain symbol in one or more time slots;
or 12 × 6 configured pilots are provided, wherein the first time-frequency pilot block of the pilots includes 4 consecutive time-domain symbols, and the starting position is the 1 st time-domain symbol in one or more time slots;
or 12 × 8 configured pilots are provided, wherein a first time-frequency pilot block of the pilots includes 4 consecutive time-domain symbols, and the starting position is the 1 st time-domain symbol in one or more time slots;
or 12 × 16 configured pilots are configured, wherein the first time frequency pilot block of the pilots includes 8 consecutive time domain symbols, and the starting position is the 1 st time domain symbol in one or more time slots.
Or 12 × 20 configured pilots, wherein the first time-frequency pilot block of the pilots includes 8 consecutive time-domain symbols, and the starting position is the 1 st time-domain symbol in one or more time slots.
In step 601, a pilot signal may be generated according to a configured pilot sequence of some or all pilots.
Referring to fig. 7, another embodiment of the present application provides a method for transmitting a reference signal, including:
For example, correlation detection results in a pilot sequence in the pilot signal; or the problem of detecting the pilot frequency sequence corresponding to the first time frequency pilot frequency block is simplified into the problem of detecting a plurality of short sequences. As an example, when detecting a pilot sequence with a length of 48, the first step is: the first part, the second part, the third part and the fourth part can be detected in parallel; the second step is that: and performing correlation operation on the correlation value obtained in the first step and the extended sequence to obtain a detection value.
Optionally, the method further includes:
In the embodiment of the present application, the pilot includes a first time frequency pilot block and a pilot sequence corresponding to the first time frequency pilot block, where the pilot sequence corresponding to the first time frequency pilot block is obtained according to a pilot sequence corresponding to a second time frequency pilot block.
In the embodiment of the present application, reference may be made to the description of the foregoing embodiment for the description of the first time frequency pilot block and the second time frequency pilot block, which is not described herein again.
In an embodiment of the present application, detecting all the pre-configured pilots to obtain a pilot sequence in a pilot signal includes:
detecting 4NX/I pre-allocated pilot frequencies to obtain a pilot frequency sequence in a pilot frequency signal;
or detecting 6NX/I pre-allocated pilots to obtain a pilot sequence in the pilot signal; wherein X is the number of the spreading sequences, X is more than or equal to 2, and I is the length of the spreading sequences.
In the embodiment of the present application, the pilot sequence corresponding to the first time-frequency pilot block has a hierarchical structure, which can greatly reduce the detection complexity, that is, the hierarchical structure enables the receiver to perform hierarchical detection, that is, the detection problem of the pilot sequence corresponding to the first time-frequency pilot block is simplified into the detection problem of a plurality of short sequences.
In the embodiments of the present application, the specific form of the spreading sequence is not limited. For example, the spreading sequence used for pilot spreading may employ a spreading sequence used for spreading of data symbols. The method can use the extended sequence to discover the user, and simplifies the realization of the receiver.
In step 702, a transmitting terminal for transmitting the pilot signal is determined according to the pilot of the detected pilot sequence, and the transmitting terminal corresponding to the pilot of the detected pilot sequence can be searched in the correspondence between the transmitting terminal and the pilot. Wherein, the sending terminal in the corresponding relationship can be represented by the identity of the sending terminal.
Referring to fig. 8, another embodiment of the present application provides a method for transmitting a reference signal, including:
Optionally, the method further comprises: step 803, determining the transmitting terminal for transmitting the pilot signal according to the pilot of the detected pilot sequence.
In the embodiments of the present application, one or more pilots may be configured for one transmitting terminal, for example, one pilot may be configured for one transmitting terminal, or two pilots may be configured for one transmitting terminal, and so on. When two or more pilot frequencies are configured for one sending terminal, the collision probability of pilot frequency resources is further reduced, and the detection reliability is improved.
In the embodiment of the present application, a corresponding pilot may be configured for a sending terminal according to a distance from the sending terminal. For example, the comb structure corresponding to the pilot is selected according to the distance to the transmitting terminal.
Or grouping the pilot sequences corresponding to the first time frequency pilot block, configuring different groups to different sending terminals, and selecting the pilot sequences from different groups by different sending terminals. Specifically, the grouping may be performed according to a comb structure, or according to the type of the pilot sequences, or according to the correlation characteristics.
In step 803, a transmitting terminal that transmits the pilot signal is determined according to the pilot of the detected pilot sequence, and the transmitting terminal corresponding to the pilot of the detected pilot sequence can be searched in the correspondence between the transmitting terminal and the pilot.
If two or more pilots are configured for the sending terminal, it is detected that the number of the pilots of the same sending terminal is the same as the number of the configured pilots, or that the number of the pilots of the same sending terminal is smaller than the number of the configured pilots, and the detected pilots sent by the same sending terminal need to be combined. The method further reduces the collision probability of the pilot frequency resource and improves the detection reliability.
Two or more pilots of the same transmitting terminal may be combined in the following manner.
The two or more pilot sequences transmitted by the same transmitting terminal are weighted-averaged, that is, each pilot sequence is multiplied by corresponding weight and then added.
Referring to fig. 9, another embodiment of the present application provides an apparatus for transmitting a reference signal, including:
the generating module is used for generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block;
a sending module, configured to send the pilot signal;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot block includes L time-domain symbols, L being less than N.
Referring to fig. 10, another embodiment of the present application provides an apparatus for transmitting a reference signal, including:
a receiving module, configured to receive a pilot signal;
the detection module is used for detecting all the pre-configured pilot frequencies to obtain pilot frequency sequences in the pilot signals;
the pilot frequency comprises a first time frequency pilot frequency block and a pilot frequency sequence corresponding to the first time frequency pilot frequency block, wherein the first time frequency pilot frequency block comprises N time domain symbols, and N is an integer greater than 1;
the pilot sequence corresponding to the first time-frequency pilot block can be obtained from the pilot sequence corresponding to the second time-frequency pilot block; the second time-frequency pilot block includes L time-domain symbols, L being less than N.
Optionally, the method further includes:
and the processing module is used for determining a sending terminal for sending the pilot signal according to the detected pilot frequency of the pilot sequence.
Referring to fig. 11, another embodiment of the present application provides a system for transmitting a reference signal, including:
the transmitting terminal is used for generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block; transmitting the pilot signal;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, wherein L is smaller than N;
a receiving terminal for receiving a pilot signal; and detecting all the pre-configured pilots to obtain a pilot sequence in the pilot signal.
Optionally, the receiving terminal is further configured to:
and determining a transmitting terminal for transmitting the pilot signal according to the pilot frequency of the detected pilot frequency sequence.
The sending terminal and the receiving terminal may be any communication nodes, for example, the sending terminal is a User Equipment (UE), and the receiving terminal is a base station.
Another embodiment of the present application provides an apparatus for transmitting reference signals, which includes a processor and a computer-readable storage medium, wherein the computer-readable storage medium has instructions stored therein, and when the instructions are executed by the processor, the method for transmitting reference signals according to any one of the above methods is implemented.
Another embodiment of the present application proposes a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of any of the above-mentioned methods of transmitting reference signals.
Wherein the computer readable storage medium comprises at least one of: flash Memory, a hard disk, a multimedia Card, a Card type Memory (e.g., a Secure Digital Memory Card (SD Card) or a Data Register (DX) Memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic Memory, a magnetic disk, an optical disk, etc.
The processor may be a Central Processing Unit (CPU), a controller, a microcontroller, a microprocessor, or other data Processing chip, etc.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (15)
1. A method of transmitting reference signals, comprising:
generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, and L is less than N;
transmitting the pilot signal;
the j part of the pilot sequence corresponding to the first time frequency pilot frequency block is obtained by the product of the ith element of the spreading sequence and all elements of the pilot sequence corresponding to the second time frequency pilot frequency block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I; the extended sequences are { 11 1}, { 1-1-1 }, { 1-ii 1}, {1 i-1 }, { 1-i-1 }, {1 i-i 1}, { 1-1-i-i }, and { 1-ii }, { 1-1 i }, {1 i-1 i }, { 1-i-1-i }, {1 i 1-i }, { 1-i 1 i }, { 100 }, { 01 00 00 }, { 01 0} or { 00 00 01 };
the pilot sequence corresponding to the first time frequency pilot block comprises any one of the following:
a complex sequence; a Walsh sequence; discrete fourier sequences; a ZC sequence; PN sequence;
the elements of the complex sequence are a + bj, and a and b are integers;
a is 1, b is 0;
or, a is-1, b is 0;
or, a is 0 and b is 1;
or a is 0 and b is-1.
2. The method of claim 1, wherein the first time frequency pilot block comprises L x J time domain symbols.
3. The method of claim 1, wherein the pilot sequence corresponding to the first time-frequency pilot block comprises at least one of:
a pilot frequency sequence is obtained by time domain expansion of the pilot frequency sequence corresponding to the second time frequency pilot frequency block;
and time domain spreading a pilot frequency sequence obtained by a sequence orthogonal to the pilot frequency sequence corresponding to the second time frequency pilot frequency block.
4. The method of claim 3, wherein the sequence orthogonal to the pilot sequence corresponding to the second time-frequency pilot block is determined according to a cyclic shift and the pilot sequence corresponding to the second time-frequency pilot block.
5. The method of claim 1, wherein the time domain resource position of the pilot sequence corresponding to the first time frequency pilot block is any one of:
the first N time domain symbols of each slot, the first N time domain symbols of every two slots.
6. The method of claim 1, wherein the frequency-domain resource locations of the pilot sequences are in a comb structure.
7. A method of transmitting reference signals, comprising:
receiving a pilot signal; detecting all the pre-allocated pilot frequencies to obtain a pilot frequency sequence in the pilot frequency signal;
the pilot frequency comprises a first time frequency pilot frequency block and a pilot frequency sequence corresponding to the first time frequency pilot frequency block, wherein the first time frequency pilot frequency block comprises N time domain symbols, and N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, and L is less than N;
the j part of the pilot sequence is obtained by the product of the extension sequence and the ith element of all elements of the pilot sequence corresponding to the second time-frequency pilot frequency block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I; the extended sequences are { 11 1}, { 1-1-1 }, { 1-ii 1}, {1 i-1 }, { 1-i-1 }, {1 i-i 1}, { 1-1-i-i }, and { 1-ii }, { 1-1 i }, {1 i-1 i }, { 1-i-1-i }, {1 i 1-i }, { 1-i 1 i }, { 100 }, { 01 00 00 }, { 01 0} or { 00 00 01 };
the pilot sequence corresponding to the first time frequency pilot block comprises any one of the following:
a sequence of complex numbers; a Walsh sequence; a discrete fourier sequence; a ZC sequence; a PN sequence;
the elements of the complex sequence are a + bj, and a and b are integers;
a is 1, b is 0;
or, a is-1 and b is 0;
or, a is 0 and b is 1;
or a is 0 and b is-1.
8. The method of claim 7, further comprising:
and determining a sending terminal for sending the pilot signal according to the pilot frequency of the detected pilot frequency sequence.
9. The method of claim 8, wherein determining a transmitting terminal to transmit the pilot signal based on detecting the pilot of the pilot sequence comprises:
and searching a sending terminal corresponding to the pilot frequency of the detected pilot frequency sequence in the corresponding relation between the sending terminal and the pilot frequency.
10. The method of claim 7, wherein the detecting all the pre-configured pilots to obtain pilot sequences in the pilot signals comprises:
detecting 4NX/I pre-configured pilot frequencies to obtain a pilot frequency sequence in a pilot frequency signal;
or detecting 6NX/I pre-configured pilots to obtain a pilot sequence in the pilot signal; wherein X is the number of the spreading sequences, X is more than or equal to 2, and I is the length of the spreading sequences.
11. The method of any of claims 7-9, wherein the pilot sequence corresponding to the first time-frequency pilot block comprises at least one of:
a pilot frequency sequence is obtained by time domain expansion of the pilot frequency sequence corresponding to the second time frequency pilot frequency block;
and time domain spreading a pilot frequency sequence obtained by a sequence orthogonal to the pilot frequency sequence corresponding to the second time frequency pilot frequency block.
12. An apparatus for transmitting reference signals, comprising:
the generating module is used for generating a pilot signal according to a pilot sequence corresponding to the first time frequency pilot block;
a transmitting module, configured to transmit the pilot signal;
the first time frequency pilot frequency block comprises N time domain symbols, wherein N is an integer greater than 1;
the pilot frequency sequence corresponding to the first time frequency pilot frequency block is obtained from the pilot frequency sequence corresponding to the second time frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, and L is less than N;
the j part of the pilot sequence corresponding to the first time frequency pilot frequency block is obtained by the product of the ith element of the spreading sequence and all elements of the pilot sequence corresponding to the second time frequency pilot frequency block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I; the extended sequences are { 11 1}, { 1-1-1 }, { 1-ii 1}, {1 i-1 }, { 1-i-1 }, {1 i-i 1}, { 1-1-i-i }, and { 1-ii }, { 1-1 i }, {1 i-1 i }, { 1-i-1-i }, {1 i 1-i }, { 1-i 1 i }, { 100 }, { 01 00 00 }, { 01 0} or { 00 00 01 };
the pilot sequence corresponding to the first time frequency pilot block comprises any one of the following:
a complex sequence; a Walsh sequence; discrete fourier sequences; a ZC sequence; PN sequence;
the elements of the complex sequence are a + bj, and a and b are integers;
a is 1, b is 0;
or, a is-1 and b is 0;
or, a is 0 and b is 1;
or a is 0 and b is-1.
13. An apparatus for transmitting a reference signal, comprising:
a receiving module for receiving a pilot signal;
the detection module is used for detecting all the pre-configured pilot frequencies to obtain pilot sequences in the pilot signals;
the pilot frequency comprises a first time frequency pilot frequency block and a pilot frequency sequence corresponding to the first time frequency pilot frequency block, wherein the first time frequency pilot frequency block comprises N time domain symbols, and N is an integer greater than 1;
the pilot sequence corresponding to the first time-frequency pilot frequency block can be obtained from the pilot sequence corresponding to the second time-frequency pilot frequency block; the second time-frequency pilot frequency block comprises L time-domain symbols, wherein L is smaller than N;
the j part of the pilot sequence is obtained by the product of the spreading sequence and the ith element of all elements of the pilot sequence corresponding to the second time-frequency pilot frequency block;
wherein J is an integer from 1 to J, I is an integer from 1 to I, I is the length of the spreading sequence, and J is greater than or equal to I; the extended sequences are { 11 1}, { 1-1-1 }, { 1-ii 1}, {1 i-1 }, { 1-i-1 }, {1 i-i 1}, { 1-1-i-i }, and { 1-ii }, { 1-1 i }, {1 i-1 i }, { 1-i-1-i }, {1 i 1-i }, { 1-i 1 i }, { 100 }, { 01 00 00 }, { 01 0} or { 00 00 01 };
the pilot sequence corresponding to the first time frequency pilot block comprises any one of the following:
a complex sequence; a Walsh sequence; a discrete fourier sequence; a ZC sequence; a PN sequence;
the elements of the complex sequence are a + bj, and a and b are integers;
a is 1, b is 0;
or, a is-1 and b is 0;
or, a is 0 and b is 1;
or a is 0 and b is-1.
14. An apparatus for transmitting a reference signal, comprising a processor and a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and wherein the instructions, when executed by the processor, implement the method for transmitting a reference signal according to any one of claims 1 to 6, or the method for transmitting a reference signal according to any one of claims 7 to 11.
15. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of transmitting reference signals according to any one of claims 1 to 6 or the steps of the method of transmitting reference signals according to any one of claims 7 to 11.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810247807.3A CN110299980B (en) | 2018-03-23 | 2018-03-23 | Method, device and system for transmitting reference signal |
| PCT/CN2019/075332 WO2019179268A1 (en) | 2018-03-23 | 2019-02-18 | Method, device and system for transmitting reference signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810247807.3A CN110299980B (en) | 2018-03-23 | 2018-03-23 | Method, device and system for transmitting reference signal |
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| CN101467375A (en) * | 2006-02-14 | 2009-06-24 | 摩托罗拉公司 | Pilot signal transmission method and apparatus |
| EP2252027A1 (en) * | 2005-06-16 | 2010-11-17 | Qualcomm Incorporated | Pilot and data transmission in a MIMO system applying subband multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002164810A (en) * | 2000-09-12 | 2002-06-07 | Katsuyoshi Azeyanagi | Cyclic shift code division multiplex communication system |
| CN103944685B (en) * | 2013-01-18 | 2017-10-10 | 华为技术有限公司 | Method, equipment and the communication system of extended reference signal |
| CN106961408B (en) * | 2016-01-11 | 2020-04-24 | 中兴通讯股份有限公司 | Uplink signal sending method and device |
| CN107332796B (en) * | 2016-04-29 | 2021-11-02 | 中兴通讯股份有限公司 | Blind detection and uplink access method and device, receiver, transmitter and base station |
| CN107548094B (en) * | 2016-06-23 | 2020-08-25 | 华为技术有限公司 | Method for transmitting user sequence, network equipment and terminal equipment |
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|---|---|---|---|---|
| EP2252027A1 (en) * | 2005-06-16 | 2010-11-17 | Qualcomm Incorporated | Pilot and data transmission in a MIMO system applying subband multiplexing |
| CN101467375A (en) * | 2006-02-14 | 2009-06-24 | 摩托罗拉公司 | Pilot signal transmission method and apparatus |
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| R1-072803 "Reference signal generation method for E-UTRA uplink";Panasonic;《3GPP tsg_ran\WG1_RL1》;20070620;全文 * |
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