WO2016165099A1

WO2016165099A1 - Method for generating pilot frequency sequence, and channel demodulation method and device

Info

Publication number: WO2016165099A1
Application number: PCT/CN2015/076725
Authority: WO
Inventors: 吴涛
Original assignee: 华为技术有限公司
Priority date: 2015-04-16
Filing date: 2015-04-16
Publication date: 2016-10-20

Abstract

The present invention relates to the technical field of networks. Provided are a method for generating a pilot frequency sequence, and a channel demodulation method and device. The method comprises: dividing a pilot frequency sequence specified by a specific protocol into a first number of sub-sequences; selecting, from the first number of sub-sequences, a second number of successive sub-sequences as basic sequences; cyclically shifting the basic sequences by using a quantity of symbols comprised by a sub-sequence as a shift displacement so as to obtain a third number of shift sequences; obtaining, according to the third number of shift sequences and symbols comprised by a designated sub-sequence in each shift sequence among the third number of shift sequences, a third number of pilot frequency sequences; and using the pilot frequency sequence specified by the specific protocol and the third number of pilot frequency sequences as pilot frequency sequences of different streams among a plurality of streams, respectively. A plurality of pilot frequencies obtained by means of the present invention can be applied to a multi-stream sending scenario, and can be compatible with an original protocol.

Description

Method for generating pilot sequence, channel demodulation method and device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method for generating a pilot sequence, a channel demodulation method, and a device.

Background technique

With the development of network technology, the existing network can provide more and more system transmission speed, and due to its unique flexibility, it has been used more and more in home and business environments.

802.11ad is a subsystem in the IEEE 802.11 system. It works in the 60 GHz high frequency band and is mainly used to realize the transmission of wireless HD audio and video signals in the home. It brings a more complete HD video solution for home multimedia applications, also known as WiGig. (60GHz Wi-Fi). Compared with the current WiFi technology, 802.11ad technology has high capacity, high speed, low latency and low power consumption in multimedia applications. For example, when the OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier scheme is adopted, the maximum transmission rate can reach 7 Gbps, and when the single carrier modulation scheme is adopted, the maximum transmission rate can reach 4.6 Gbps. However, as the demand for transmission speed increases, in order to further improve network performance, the current system needs to support a MIMO (Multiple-Input Multiple-Out-put) scheme, that is, the receiving end can The pilots from different streams are identified and the channels corresponding to the respective streams are estimated based on these pilots. At present, 802.11ad only supports Single-Input Single-Output (SISO), and its Channel Estimation Field (CE) itself does not support pilots of multiple streams. Therefore, it is urgent to provide a forward-compatible multi-stream pilot scheme based on the existing 802.11ad system.

Summary of the invention

In order to support a multi-stream transmission scenario, an embodiment of the present invention provides a method, a channel demodulation method, and a device for generating a pilot sequence. The technical solution is as follows:

In a first aspect, an embodiment of the present invention provides a method for generating a pilot sequence, including:

Dividing a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, the first subsequence being the same as the symbol included in the last subsequence;

Selecting, from the first number of subsequences, a second number of consecutive subsequences as a base sequence, the second number being less than the first number, and the difference between the second number and the first number is 1;

Performing a cyclic shift on the number of symbols included in one subsequence, shifting the base sequence to obtain a third number of shift sequences, the third number being less than the second number, and the third The difference between the number and the second number is greater than or equal to 1;

Obtaining a third number of pilot sequences according to the symbols included in the third sub-shift sequence and the specified sub-sequence in each of the third sequence of shift sequences;

The pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different streams in the plurality of streams.

With reference to the first aspect, in a first possible implementation manner of the first aspect, selecting, from the first number of sub-sequences, the second number of consecutive sub-sequences as the basic sequence includes:

Selecting, from the first to the subsequences, a second number of consecutive subsequences as a base sequence in a front-to-back order; or

From the first number of subsequences, a second number of consecutive subsequences are selected as the base sequence in order from back to front.

In combination with any of the foregoing possible implementation manners, in a second possible implementation manner of the first aspect, according to the third number of shifting sequences and the third number of shifting sequences in each of the shifting sequences The symbols included in the specified subsequence, resulting in a third number of pilot sequences including:

Adding, to each of the third number of shifted sequences, a symbol in a last subsequence of the shifted sequence to a front of the shifted sequence, to obtain a corresponding sequence of the shifted sequence Pilot sequence; or,

Adding, to each of the third number of shift sequences, a symbol in the first subsequence of the shift sequence to the rear of the shift sequence, to obtain the shift sequence corresponding Pilot sequence.

In combination with any of the foregoing possible implementation manners, in a third possible implementation manner of the foregoing aspect, the pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as different flows in multiple flows. The pilot sequence includes:

The pilot sequence specified by the specific protocol is used as the pilot sequence of the first stream.

In a fourth possible implementation manner of the foregoing aspect, the pilot sequence specified by the specific protocol is a pilot sequence in 802.11ad, and the first number is 9.

In a second aspect, an embodiment of the present invention provides a method for generating a pilot sequence, including:

Performing phase shift on a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

Determining, according to the correlation between the pilot sequence specified by the specific protocol and the plurality of pilot sequences of each stream, for each stream, selecting one pilot sequence from the plurality of pilot sequences as the Streaming pilot sequence;

The pilot sequence specified by the specific protocol is used as a pilot sequence of the first of the plurality of streams.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the preset phase shift sequence is

Where m = 1, ..., M, M is the number of streams, Δ _m ∈ {0, N-1}, n = 0, ..., 1151.

In combination with any of the above possible implementation manners, in a second possible implementation manner of the second aspect, the correlation between the pilot sequence specified by the specific protocol and the multiple pilot sequences of each stream is For each stream, selecting a pilot sequence from the plurality of pilot sequences as the pilot sequence of the stream includes:

For each stream, from among the plurality of pilot sequences of the stream, a pilot sequence that minimizes the value of the correlation of the pilots of the different streams to each other is minimized.

In a third possible implementation manner of the second aspect, in combination with the foregoing second possible implementation manner, selecting, from a plurality of pilot sequences of the stream, selecting a value that minimizes correlation between pilots of different streams. The derived pilot sequence is obtained using the following formula:

Where cε _m1 (n) is the pilot sequence of the m1th stream, N _g =128, 0≤l≤N-1, N=1024, 0≤n≤N.

In combination with the first aspect or the second aspect, the method further includes:

When the multi-stream transmission is used, the indication field is carried in the transmission frame sent by the first stream, and the indication field is used to indicate that the scene is currently sent in multiple streams and the number of streams.

In a third aspect, an embodiment of the present invention provides a channel demodulation method, including:

Receiving a transmission frame, the transmission frame carrying a pilot sequence specified by a specific protocol;

Performing channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information;

Demodulating a specified bit of the transmission frame according to the first channel information, and determining whether it is a multi-stream transmission scenario;

If the scenario is currently sent for multiple streams, channel information of other streams is estimated according to the received pilot sequence, and after obtaining channel information of other streams, the data portion of the transmission frame of each stream is first demodulated;

If the scene is currently transmitted for a single stream, a second demodulation is performed on the data portion of the transmission frame.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the first demodulation is a multiple input multiple output MIMO mode, and the second demodulation is a single input single output SISO mode.

In a fourth aspect, an embodiment of the present invention provides an apparatus for generating a pilot sequence, including:

a dividing module, configured to divide a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, the first subsequence being the same as the symbol included in the last subsequence;

a selection module, configured to select, from the first number of sub-sequences obtained by the dividing module, a second number of consecutive sub-sequences as a base sequence, where the second number is smaller than the first number, and The difference between the second number and the first number is 1;

a shifting module, configured to cyclically shift the base sequence selected by the selection module by using a number of symbols included in one subsequence as a shift displacement, to obtain a third number of shift sequences, and the third The number is smaller than the second number, and the difference between the third number and the second number is greater than or equal to 1;

a pilot sequence generating module, configured to be included according to the third number of shift sequences obtained by the shifting module and the specified subsequence in each of the third number of shift sequences Symbol, obtaining a third number of pilot sequences;

And an allocating module, configured to use the pilot sequence specified by the specific protocol and the third number of pilot sequences obtained by the pilot sequence generating module as pilot sequences of different streams in the multiple streams.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the selecting module is configured to select, from the first number of sub-sequences, a second number of consecutive sub-subjects in a front-to-back order The sequence is used as a base sequence; or, the selection module is configured to select a second number of consecutive sub-sequences from the first number of sub-sequences in a back-to-front order as a base sequence.

In conjunction with any of the foregoing possible implementation manners, in a second possible implementation manner of the fourth aspect, the pilot sequence generating module is configured to: for each of the third sequence of the shift sequences, a symbol in a last subsequence of the shift sequence is added to the front of the shift sequence to obtain a pilot sequence corresponding to the shift sequence; or the pilot sequence generating module is configured to use the a shift sequence in the first subsequence of the shift sequence is added to the shift sequence to obtain a pilot sequence corresponding to the shift sequence. .

In conjunction with any of the foregoing possible implementation manners, in a third possible implementation manner of the fourth aspect, the allocating module is configured to use the pilot sequence specified by the specific protocol as a pilot sequence of the first stream.

In a fifth aspect, an embodiment of the present invention provides an apparatus for generating a pilot sequence, including:

a phase shifting module, configured to phase shift a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

a selection module for selecting a pilot sequence according to the specific protocol and a correlation between a plurality of pilot sequences of each stream, for each stream, selecting a guide from the plurality of pilot sequences a frequency sequence as a pilot sequence of the stream;

And an allocation module, configured to use the pilot sequence specified by the specific protocol as a pilot sequence of the first one of the multiple streams.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the preset phase shift sequence is

In combination with any of the foregoing possible implementation manners, in a second possible implementation manner of the fifth aspect, the selecting module is configured to, for each stream, select a guide that causes different flows from a plurality of pilot sequences of the flow A pilot sequence whose frequency is minimized by the maximum correlation between each other.

In conjunction with the second possible implementation manner described above, in a third possible implementation manner of the fifth aspect, the selecting module is configured to apply the following formula:

In combination with the fourth aspect or the fifth aspect, the method further includes:

The device also includes:

The sending module is configured to carry an indication field in the transmission frame sent by the first stream when the multi-stream transmission is used, where the indication field is used to indicate that the scenario is currently sent by the multi-stream and the number of streams.

In a sixth aspect, an embodiment of the present invention provides a channel demodulation apparatus, including:

a receiving module, configured to receive a transmission frame, where the transmission frame carries a pilot sequence specified by a specific protocol;

a channel estimation module, configured to perform channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information;

a first demodulation module, configured to demodulate a specified bit of the transmission frame according to the first channel information, and determine whether the scenario is a multi-stream transmission scenario;

The channel estimation module is further configured to: if the scenario is currently being sent by the multi-stream, estimate channel information of other streams according to the received pilot sequence, and after obtaining channel information of other streams, the first demodulation module For performing first demodulation on a data portion of a transmission frame of each stream;

And a second demodulation module, configured to perform second demodulation on the data portion in the transmission frame if the scenario is currently sent for a single stream.

In a first possible implementation manner of the sixth aspect, the first demodulation is a multiple input multiple output MIMO mode, and the second demodulation is a single input single output SISO mode.

In a seventh aspect, an embodiment of the present invention provides a site device, including:

a processor and a plurality of antennas;

The processor is configured to divide a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, and symbols included in the first subsequence and the last subsequence the same;

In an eighth aspect, an embodiment of the present invention provides a site device, including:

a processor and a plurality of antennas;

The processor is configured to phase shift a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

In a ninth aspect, an embodiment of the present invention provides a site device, including:

a processor and a plurality of antennas;

Wherein the processor is configured to receive a transmission frame, the transmission frame carrying a pilot sequence specified by a specific protocol;

The beneficial effects of the technical solutions provided by the embodiments of the present invention are:

By performing cyclic shifting on a partial subsequence in the original pilot sequence based on a specific protocol and complementing the length of the pilot sequence with symbols in the specified subsequence, multiple pilot sequences are obtained, since during the generation process, Only the order relationship between the sub-sequences is changed, and the basic composition rules of the symbols in the pilot sequence are not changed. Therefore, the obtained multiple pilots can be applied to the scenario of multi-stream transmission, and can be compatible with the original pilot. Sequence protocol.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

FIG. 1A is a schematic structural diagram of an implementation environment according to an embodiment of the present invention.

FIG. 1B is a flowchart of a method for generating a pilot sequence according to an embodiment of the present invention.

2 is a schematic diagram of an existing frame structure of 802.11ad.

FIG. 3A is a schematic diagram of a configuration of a CE in an 802.11ad single carrier according to an embodiment of the present invention.

FIG. 3B is a schematic diagram of a configuration manner of a CE in an 802.11ad multi-carrier, that is, OFDM according to an embodiment of the present invention.

FIG. 4A is a schematic diagram of another configuration manner of a CE in an 802.11ad single carrier according to an embodiment of the present invention.

FIG. 4B is a schematic diagram of another configuration manner of a CE in an 802.11ad multi-carrier, that is, OFDM according to an embodiment of the present invention.

FIG. 5A is a schematic diagram of a data structure of a single carrier according to an embodiment of the present invention.

FIG. 5B is a schematic diagram of a data structure of a multi-carrier according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a pilot expression form according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a shift sequence according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a pilot sequence according to an embodiment of the present invention.

FIG. 8B is a schematic structural diagram of another pilot sequence according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of a correspondence between a stream and a pilot sequence according to an embodiment of the present invention.

FIG. 10 is a flowchart of a method for generating a pilot sequence according to an embodiment of the present invention.

FIG. 11 is a schematic flowchart diagram of a channel demodulation method according to an embodiment of the present invention.

FIG. 12 is a schematic structural diagram of an apparatus for generating a pilot sequence according to an embodiment of the present invention.

FIG. 13 is a schematic structural diagram of an apparatus for generating a pilot sequence according to an embodiment of the present invention.

FIG. 14 is a schematic structural diagram of a channel demodulating apparatus according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1A is a schematic structural diagram of an implementation environment according to an embodiment of the present invention. Referring to FIG. 1A, in the implementation environment, a plurality of STAs (Stations) may be included, and each of the plurality of STAs has a function of receiving data and transmitting data, where each STA may have multiple antennas. To support multi-stream scenarios.

FIG. 1B is a flowchart of a method for generating a pilot sequence according to an embodiment of the present invention. Referring to FIG. 1B, the method specifically includes:

101. Divide a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, and the first subsequence is the same as the symbol included in the last subsequence.

The pilot sequence specified by the specific protocol may refer to a pilot sequence used in the current network system. By performing a first number of aliquots on the pilot sequences specified by the particular protocol, a first number of subsequences can be obtained, and the number of symbols included in each subsequence is the same. In the embodiment of the present invention, the symbols included in the first subsequence and the last subsequence are the same, and the order of the symbols is also the same. For example, the pilot sequence specified by a specific protocol is {a, b, c, d, e, f, g, h, a}, wherein a to h represent subsequences including 128 symbols, respectively.

102. Select, from the first number of sub-sequences, a second number of consecutive sub-sequences as a base sequence, where the second number is smaller than the first number, and the difference between the second number and the first number The value is 1.

In order to ensure that the subsequently generated pilot sequence contains the same symbols as the symbols in the pilot sequence specified by the specific protocol, a certain number of subsequences may be selected from the first number of subsequences as the base sequence of the displacement, due to the specific The nature of the pilot sequence specified by the protocol, that is, the first subsequence is the same as the symbol included in the last subsequence, and therefore, the second number may be the first number minus one.

If the pilot sequence specified by the specific protocol can be divided into 9 sub-sequences based on the pilot sequence specified by the specific protocol in the

above step

101, 8 consecutive sub-sequences can be selected as the base sequence.

103. Perform cyclic shifting on the base sequence by using a number of symbols included in one sub-sequence as a shift displacement, to obtain a third number of shift sequences, where the third number is smaller than the second number, and The difference between the third number and the second number is greater than or equal to one.

Shifting the number of symbols included in a subsequence means shifting each symbol in the first sub-sequence to the second-to-last sub-sequence in the base sequence by 128 each time the base sequence is shifted. Bit, the last subsequence is shifted to the position of the original first subsequence. Still based on the pilot sequence specified by the specific protocol in step 101 above, if the last 8 consecutive subsequences are selected as the base sequence, the base sequence {b, c, d, e, f, g, h, a} can be obtained. , the base sequence is shifted once to obtain {a, b, c, d, e, f, g, h}. At this point, it can be seen that the subsequence included in the shifted sequence is in fact The partial subsequences included in the pilot sequence specified by the specific protocol are the same except for the order in which the subsequences are arranged.

Here, the third number is smaller than the second number, and the difference between the third number and the second number is greater than or equal to 1. For a pilot sequence specified by a specific protocol, the number of generated shift sequences may be The value range of {1, the second number -1}, that is, the cyclic shift of the base sequence can be generated according to the number of streams or the number of streams currently used, to generate a required number of shift sequences.

For example, for a system with 8 antennas, only 5 antennas are in use, then it can be based on Cycling, generating 4 shift sequences, based on the 4 shift sequences, performing subsequent steps to generate 4 pilot sequences, and the 4 pilot sequences and the pilot sequence specified by the specific protocol are respectively taken as 5 The pilot sequence of the stream.

104. Obtain a third number of pilot sequences according to the symbols included in the third sub-shift sequence and the specified sub-sequence in each of the third sequence of shift sequences.

The length of the shift sequence obtained by the above steps 101-103 is different from the pilot sequence specified by the specific protocol by a subsequence. In order to ensure that the subsequently generated pilot sequence can be compatible with the current communication system, the sequence length needs to be complemented. Therefore, for each shift sequence, a designated subsequence needs to be selected from the shifted sequence, and the pilot sequence corresponding to the shifted sequence is obtained by using the symbols included in the designated subsequence.

105. The pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different streams in the multiple streams.

The different sequences correspond to different pilot sequences. In the embodiment of the present invention, the pilot sequence specified by the specific protocol may be used as the pilot sequence of the first stream, and the shift sequence may be randomly allocated to different allocated streams. Of course, the shift sequence can be allocated according to the shift bit number of the base sequence, for example, the shift sequence obtained by the first shift is allocated to the second stream, and the shift sequence obtained by the second shift is allocated to The third stream and the like are not limited in this embodiment of the present invention.

The method provided by the embodiment of the present invention obtains multiple pilot sequences by cyclically shifting a partial subsequence in the original pilot sequence based on a specific protocol and complementing the length of the pilot sequence with symbols in the specified subsequence. In the process of generating, only the order relationship between the sub-sequences is changed, and the basic composition rules of the symbols in the pilot sequence are not changed. Therefore, the obtained multiple pilots can be applied to the scenario of multi-stream transmission. And can be compatible with the protocol of the original pilot sequence.

Optionally, obtaining, according to each of the third sequence of the shift sequence and the symbol included in the specified subsequence in the shift sequence, obtaining the third number of pilot sequences includes:

Adding, to each of the third number of shift sequences, a symbol in the first subsequence of the shift sequence corresponding to the shift sequence, to obtain the shift sequence Pilot sequence.

Optionally, the pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different flows in the multiple streams, including:

Optionally, the pilot sequence specified by the specific protocol is a pilot sequence in 802.11ad, and the first number is 9.

Example 1

In order to explain the above method of generating a pilot sequence, the following description of the existing CE of 802.11ad will be given.

As shown in FIG. 2, the existing frame structure of 802.11ad specifically includes:

STF (Short Training Field), short training field synchronization at the receiver;

CE (Channel Estimation Field), channel estimation domain is used for channel estimation;

Header (frame header) for transmitting control signaling, such as the code modulation mode of the Date part;

Data (data) used to carry data;

TRN-R (Receive training) Field/TRN-T (Transmit training) Field for beamforming training of transmitters and receivers to help transmitters and receivers find the best beamforming method.

In the above frame structure, the CE may have different configurations in different transmission modes. 3A and FIG. 3B, FIG. 3A is a schematic diagram of a configuration of a CE in an 802.11ad single carrier according to an embodiment of the present invention. FIG. 3B is a schematic diagram of a configuration manner of a CE in an 802.11ad multi-carrier, that is, OFDM according to an embodiment of the present invention.

_{_{Wherein, Gu 512 = [- Gb 128}} -Ga 128 Gb 128 -Ga 128],

Gv ₅₁₂ = [-Gb ₁₂₈ Ga ₁₂₈ - Gb _{128 -} Ga ₁₂₈ ].

The sequence corresponding to Ga ₁₂₈ can be the following sequence (sequence from left to right, top to bottom):

{+1 +1 -1 -1 -1 -1 -1 -1 -1 +1 -1 +1 +1 -1 -1 +1 +1 +1 -1 -1 +1 +1 +1 +1 - 1 +1 -1 +1 -1 +1 +1 -1 -1 -1 +1 +1 +1 +1 +1 +1 +1 -1 +1 -1 -1 +1 +1 -1 +1 + 1 -1 -1 +1 +1 +1 +1 -1 +1 -1 +1 -1 +1 +1 -1 +1 +1 -1 -1 -1 -1 -1 -1 -1 +1 - 1 +1 +1 -1 -1 +1 +1 +1 -1 -1 +1 +1 +1 +1 -1 +1 -1 +1 -1 +1 +1 -1 +1 +1 -1 - 1 -1 -1 -1 -1 -1 +1 -1 +1 +1 -1 -1 +1 -1 -1 +1 +1 -1 -1 -1 -1 +1 -1 +1 -1 + 1 -1 -1 +1}.

The sequence corresponding to Gb ₁₂₈ can be the following sequence (sequence from left to right, top to bottom):

{-1 -1 +1 +1 +1 +1 +1 +1 +1 -1 +1 -1 -1 +1 +1 -1 -1 -1 +1 +1 -1 -1 -1 -1 + 1 -1 +1 -1 +1 -1 -1 +1 +1 +1 -1 -1 -1 -1 -1 -1 -1 +1 -1 +1 +1 -1 -1 +1 -1 - 1 +1 +1 -1 -1 -1 -1 +1 -1 +1 -1 +1 -1 -1 +1 +1 +1 -1 -1 -1 -1 -1 -1 -1 +1 - 1 +1 +1 -1 -1 +1 +1 +1 -1 -1 +1 +1 +1 +1 -1 +1 -1 +1 -1 +1 +1 -1 +1 +1 -1 - 1 -1 -1 -1 -1 -1 +1 -1 +1 +1 -1 -1 +1 -1 -1 +1 +1 -1 -1 -1 -1 +1 -1 +1 -1 + 1 -1 -1 +1}.

Further, the sequence in the above table is multiplied by the corresponding phase shifted signal to obtain pilots corresponding to single carrier and multiple carrier (OFDM):

Wherein, the pilot corresponding to the single carrier is:

n=0,1,...,1151

Wherein, the pilot corresponding to multi-carrier (OFDM) is:

n=0,1,...,1151

Among them, Gu ₅₁₂ (n) and Gv ₅₁₂ (n) are valid only in the range of 0 ≤ n ≤ 511, and values outside the range are 0.

According to equations (1) and (2), we can re-express the composition of CE in 802.11ad single carrier and multi-carrier as in the form of FIG. 4A and FIG. 4B.

In Figures 4A and 4B,

0≤n≤128

Through the above analysis, it can be seen that the data structure design in a single carrier is as shown in FIG. 5A, and 512 symbols generated after modulation constitute one data block, and the last 128 symbols of the data block are copied to the forefront of the data block to become a GI. (Guard Interval, guard interval). The data structure design in the multi-carrier is similar to that of the single carrier. As shown in FIG. 5B, the modulated 512 symbols form a data block in the frequency domain, and the inverse Fourier transform is performed on the 512 symbols to the time domain. The 512 symbols copy the last 128 symbols of the 512 symbols in the time domain to the front end of the data block to become a CP (Cyclic Prefix).

Based on the CE configuration modes provided in FIGS. 3A, 3B and formulas (1) and (2), the CE can be collectively represented in the form of FIG.

In the first step, a CE can be divided into 9 sub-sequences, each sub-sequence consisting of 128 symbols, and the first sub-sequence and the last sub-sequence contain the same symbols. For the convenience of subsequent description, the second sub-sequence to the last sub-sequence are denoted by a, b, c, d, e, f, g, h, respectively, since the first sub-sequence and the last sub-sequence contain the same symbol. Therefore, they are all represented by h. Each subsequence is composed of 128 symbols, that is, a total of 1152 symbols of a CE. The sampling interval is T _{c. For} example, a symbol occupies a length of T _c , and each subsequence occupies 128 T _c .

For ease of subsequent description, definition, _{N = 1024, N g = 128} , the second to ninth subsequences subsequences represented as cε (n), where, 0≤n <N. For distinguishing, the second sub-sequence to the ninth sub-sequence of the single carrier may be expressed as: cε(n)=cε _SC (n), and the second sub-sequence to the ninth sub-sequence when multi-carrier is expressed as: Cε(n)=cε _OFDM (n).

Based on the above expression, the formula (1) is simplified to obtain:

Based on the above expression, the formula (2) is simplified to obtain:

And if formulas (1) and (2) are not considered, for a single carrier, you can get:

Cε(n)=(Gu ₅₁₂ (n)+Gv ₅₁₂ (n-512+N _g )

+Gv ₅₁₂ (n-1024+N _g ), 0≤n≤N

For a single carrier, you can get:

Cε(n)=(Gv ₅₁₂ (n+N _g )+Gu ₅₁₂ (n-512+N _g )

+Gu ₅₁₂ (n-1024+N _g ), 0≤n≤N

Among them, Gu ₅₁₂ (n) and Gv ₅₁₂ (n) are valid only in the range of 0 ≤ n ≤ 511, and the values outside the range are all 0.

In the second step, the eight consecutive subsequences of the second to ninth subsequences may be selected as the base sequence from the back to the top of the nine subsequences divided into the above, that is, the above cε(n) .

In the third step, the base sequence cε(n) is cyclically shifted by 128 symbols, and seven shift sequences are obtained. The seven shift sequences are shown in FIG. 7, and each of FIG. 7 is shown in FIG. One line is the shift sequence obtained after cyclic shift. It should be noted that the embodiment of the present invention does not limit the left loop or the right loop.

The cyclic shift can be performed by the following formula: cε _l (n)=cε(mod(n+l,N)), 0≤n≤N, where l is an integer and satisfies 0≤l≤N-1.

In the fourth step, for each of the seven shift sequences and the base sequence obtained in the third step above, 128 symbols in the last subsequence in the sequence are added to the front of the sequence to obtain 1152 symbols. The pilot sequence CE _l (n).

This process can be performed using the following formula:

For example, taking the shift sequence obtained by the first shift as an example, the last one of the shift sequences can be The 128 symbols in the subsequence g are added to the front of the shifted sequence to obtain a pilot sequence containing 1152 symbols, as shown in Fig. 8A.

Of course, in the fourth step, the symbols in the last subsequence of the shift sequence are added to the front of the shift sequence for each of the third number of shift sequences. The process of obtaining the pilot sequence corresponding to the shift sequence is performed by adding 128 symbols in the last subsequence of the sequence to the front of the sequence. In an actual scenario, the following may also be adopted. Alternatively, for each of the third number of shifted sequences, adding a symbol in the first subsequence of the shifted sequence to the rear of the shifted sequence, The pilot sequence of the shifted sequence.

Specifically, 128 symbols in the first subsequence in the sequence are added to the sequence to obtain a pilot sequence of the sequence. This process can be performed using the following formula:

For example, the shift sequence obtained by the first shift is taken as an example, and 128 symbols in the first sub-sequence g in the shift sequence may be added to the rear of the shift sequence to obtain 1152. The pilot sequence of the symbol is shown in Figure 8B.

Based on the steps in the first step to the fourth step, eight pilot sequences can be obtained. After the eight pilot sequences are obtained, the eight pilot sequences can be respectively used as pilot sequences of different streams in multiple streams. For example, the correspondence between each stream and the pilot sequence may be as shown in FIG.

To more clearly illustrate the correspondence between the stream and the pilot sequence, reference can be made to the single-carrier CE-based multi-stream CE design scheme as shown in Table 1. In Table 1, an example is given after the introduction of the formula (1), in which the first subsequence of each pilot sequence is GI.

Table 1

Of course, if Equation (1) is not considered, Ga ₁₂₈ and Gb ₁₂₈ may be used instead of the correlation sequence.

Table 2 shows a multi-stream CE based multi-stream CE design. In Table 2, the following is given by introducing the formula (1)(2), in which the first subsequence of each pilot sequence is CP.

Table 2

Of course, if Equation (2) is not considered, Ga ₁₂₈ , -Ga ₁₂₈ , Gb ₁₂₈ , and -Gb ₁₂₈ may be used instead of the correlation sequence.

It should be noted that, in the above embodiments, the seven shift sequences are generated as an example. In an actual scenario, less than seven shift sequences may be generated based on the cyclic shift according to the transmission requirement. The embodiment of the invention does not limit this.

Example 2

In the foregoing embodiment 1, the second sub-sequence to the ninth sub-sequence divided by the pilot sequence specified by the specific protocol are taken as an example of the basic sequence, and in another embodiment provided by the embodiment of the present invention, The pilot design may be performed by taking the first sub-sequence to the eighth sub-sequence of the pilot sequence specified by the specific protocol as the basic sequence as an example. The specific process of this embodiment includes:

The first subsequence to the eighth subsequence are expressed as cε(n), where 0≤n<N. Based on In the description, the formula (1) is simplified, and you can get:

Based on the above expression, the formula (2) is simplified to obtain:

Cε(n)=(Gu ₅₁₂ (n)+Gv ₅₁₂ (n-512)+Gv ₅₁₂ (n-1024), 0≤n≤N

For a single carrier, you can get:

Cε(n)=(Gv ₅₁₂ (n)+Gu ₅₁₂ (n-512)+Gu ₅₁₂ (n-1024), 0≤n≤N

In the second step, eight consecutive sub-sequences of the first to eighth sub-sequences may be selected as the base sequence from the top-to-back sequence of the nine sub-sequences divided into the above, that is, the above-mentioned cε(n).

In the third step, the base sequence cε(n) is cyclically shifted by using 128 symbols as shift displacements to obtain 7 shift sequences. This step is the same as the third step corresponding to the embodiment 1, and will not be described herein.

The process for generating the pilot sequence in the second embodiment is the same as the fourth step in the embodiment 1, and is not described herein.

To more clearly illustrate the correspondence between the stream and the pilot sequence, reference can be made to the single-carrier CE-based multi-stream CE design scheme as shown in Table 3. In Table 3, an example is given after the introduction of the formula (1), in which the first subsequence of each pilot sequence is GI.

table 3

Of course, if Equation (1) is not considered, Ga ₁₂₈ , -Ga ₁₂₈ , Gb _{128 ,} and -Gb ₁₂₈ may be used instead of the correlation sequence.

Table 4 shows a multi-stream CE based multi-stream CE design. In Table 4, the equation (1)(2) is introduced as an example, in which the first subsequence of each pilot sequence is CP.

Of course, if Equation (1)(2) is not considered, Ga ₁₂₈ , -Ga ₁₂₈ , Gb _{128 ,} and -Gb ₁₂₈ may be used instead of the correlation sequence.

For the two different design criteria in Examples 1 and 2, by comparing Table 1 and Table 3, Table 2 and Table 4, it can be found that the pilot sequence results obtained under the two different design criteria are the same.

Embodiment 1 and Embodiment 2 provided by the embodiments of the present invention obtain multiple times by cyclically shifting based on partial subsequences in the original pilot sequence and complementing the length of the pilot sequence by symbols in the specified subsequence. The pilot sequence, since only the order relationship between the sub-sequences is changed during the generation process, the basic composition rules of the symbols in the pilot sequence are not changed, and thus the obtained multiple pilots can be applied to multi-stream transmission. The scenario is compatible with the 802.11ad protocol of the original pilot sequence.

Example 3

This embodiment 3 provides another method of generating a pilot sequence. Referring to FIG. 10, the method includes:

1001. Perform phase shift on a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain multiple pilot sequences of each stream.

Wherein, the preset phase shift sequence can be

1002. Select, according to the correlation between the pilot sequence specified by the specific protocol and the multiple pilot sequences of each stream, for each stream, select one pilot sequence from the multiple pilot sequences as The pilot sequence of the stream.

In order to minimize the mutual interference between the stream pilots on the basis of ensuring compatibility, a pilot sequence that minimizes the correlation between the pilots of different streams with the greatest correlation between each other may be selected when selecting the pilot sequence.

1003. Use a pilot sequence specified by a specific protocol as a pilot sequence of a first one of the plurality of streams.

Taking the single carrier in 802.11ad as an example, the pilots of the M flows are described as follows:

among them,

Δ _m ∈{0, N-1}, m=1, . . . , M, wherein the M selection is satisfied such that the pilots of different streams are minimized from each other, and the condition can be obtained by the following formula:

The meaning of the above formula is to minimize the value of the maximum correlation between the CEs of different streams, and the Δ _m satisfying the above relationship can be obtained in an exhaustive manner. When Δ _m is determined according to the above formula, one pilot sequence may be selected from the plurality of pilot sequences corresponding to each stream as the pilot sequence of the stream, so that it is possible. Since the pilot generation method of the multi-carrier is the same as that of the above single carrier, it will not be described here.

Based on the above description, reference can be made to the multi-stream CE design scheme based on single carrier CE as shown in Table 5.

table 5

Based on the above description, reference can be made to the multi-stream CE design based on multi-carrier CE as shown in Table 6.

Table 6

Embodiment 3 provided by the embodiment of the present invention performs phase shift based on a partial subsequence in the original pilot sequence, and considers a correlation problem between different stream pilots, and therefore, based on the generation process Multiple pilot sequences can be applied not only to the scenario of multi-stream transmission, but also to the 802.11ad protocol of the original pilot sequence.

The embodiment of the present invention provides a channel demodulation method applied to a receiving end. Referring to FIG. 11, the method includes:

1101. Receive a transmission frame, where the transmission frame carries a pilot sequence specified by a specific protocol.

Generally, the transmission frame transmitted by the first stream is demodulated, and the first stream is a stream having a header in the frame structure of the transmission frame.

Before the step 1101, the method further includes a STF synchronization, a single carrier or a multi-carrier detection process, and the specific process is the same as the prior art, and is not described herein.

1102. Perform channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information.

The process of channel estimation is the same as that of the prior art, and will not be described herein.

1103. Demodulate a specified bit of the transmission frame according to the first channel information, and determine whether the scenario is a multi-stream transmission scenario.

The designated bit may be a header (frame header), and is used to carry an indication field, which is used to indicate a multi-stream transmission scenario and a number of streams.

1104. If the scenario is currently sent by the multi-stream, the channel information of the other stream is estimated according to the pilot sequence specified by the received specific protocol, and after obtaining the channel information of the other stream, the data part of the transmission frame of each stream is obtained. Perform the first demodulation.

1105. Perform a second demodulation on the data part in the transmission frame if the scenario is currently sent in a single stream.

The first demodulation is a MIMO (Multiple-Input Multiple-Output) method, and the second demodulation is a SISO (Single-Input Single-Output) method.

On the basis of the foregoing Embodiment 1 - Embodiment 3, in order to facilitate the multi-stream reception by the receiving system, the frame structure of the multi-stream concurrency is improved, that is, an indication field is added to the transmission frame, and the indication field is added. It is used to indicate the multi-stream transmission scenario and the number of streams (that is, the multi-stream transmission scenario and the number of streams corresponding to multiple streams). Correspondingly, on the basis of the method for generating pilots of Embodiment 1 to Embodiment 3, the method further includes: when transmitting by using multiple streams, carrying an indication field in a transmission frame sent by the first stream, the indication The field is used to indicate the multi-stream transmission scene and the number of streams. Preferably, the indication field may be located in a header (such as a header), and if the indication field is carried in the header, the current scenario is determined to be a multi-stream transmission scenario. If the number of the included flows is 4, the flow transmission scenario is multi-stream transmission, and The number of streams used is four. When the receiving end determines that the stream sending scenario is multi-stream transmission, the receiving end may estimate the channel according to the pilot of the first stream, so that the receiving end may be configured according to the receiving end. The frequency sequence, the received pilot signal, and the number of streams are used to estimate channel information of other streams. After obtaining channel information of other streams, the data portion of the transmission frame of each stream is demodulated.

In the above embodiment, by improving the frame structure of the transmission frame, the current bit is indicated by the field of the specified bit. The flow sending scenario enables the receiving end to distinguish the current streaming sending scenario, thereby performing flexible demodulation. Since the modification of the frame structure only involves the meaning of the indication field, it can be compatible with the 802.11ad protocol and effectively support the MIMO technology. Implementation.

FIG. 12 is a schematic structural diagram of an apparatus for generating a pilot sequence according to an embodiment of the present invention. Referring to Figure 12, the apparatus includes:

a dividing module 1201, configured to divide a pilot sequence specified by a specific protocol into a first number of sub-sequences, each sub-sequence including the same number of symbols, the first sub-sequence being the same as the symbol included in the last sub-sequence;

The selecting module 1202 is configured to select, from the first number of sub-sequences obtained by the dividing module, a second number of consecutive sub-sequences as a base sequence, where the second number is smaller than the first number, and The difference between the second number and the first number is 1;

a shifting module 1203, configured to cyclically shift the base sequence selected by the selection module by using a number of symbols included in one subsequence as a shift displacement, to obtain a third number of shift sequences, where The third number is smaller than the second number, and the difference between the third number and the second number is greater than or equal to 1;

a pilot sequence generating module 1204, configured to include, according to the third number of shift sequences obtained by the shifting module and the specified subsequence in each of the third number of shift sequences Symbol, obtaining a third number of pilot sequences;

The allocating module 1205 is configured to use the pilot sequence specified by the specific protocol and the third number of pilot sequences obtained by the pilot sequence generating module as pilot sequences of different streams in the multiple streams.

Optionally, in another embodiment, the selecting module 1202 is configured to select, from the first number of sub-sequences, a second number of consecutive sub-sequences as a base sequence in a front-to-back order; or The selecting module 1202 is configured to select, from the first number of sub-sequences, a second number of consecutive sub-sequences as a base sequence in a back-to-front order.

Optionally, in another embodiment, the pilot sequence generating module 1204 is configured to: for each of the third number of shifted sequences, the last subsequence in the shifted sequence middle a symbol is added to the front of the shifted sequence to obtain a pilot sequence corresponding to the shifted sequence; or the pilot sequence generating module 1204 is configured to move each of the third number of shifted sequences a bit sequence that adds a symbol in the first subsequence of the shifted sequence to the rear of the shifted sequence to obtain a pilot sequence corresponding to the shifted sequence.

Optionally, in another embodiment, the allocating module 1205 is configured to use the pilot sequence specified by the specific protocol as a pilot sequence of the first stream.

Optionally, in another embodiment, the pilot sequence specified by the specific protocol is a pilot sequence in 802.11ad, and the first number is 9.

FIG. 13 is a schematic structural diagram of an apparatus for generating a pilot sequence according to an embodiment of the present invention. Referring to Figure 13, the apparatus includes:

The phase shifting module 1301 is configured to perform phase shifting on a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain multiple pilot sequences of each stream;

a selection module 1302, configured to select, according to the pilot sequence specified by the specific protocol, and a correlation between a plurality of pilot sequences of each stream, for each stream, select one of the plurality of pilot sequences a pilot sequence as a pilot sequence of the stream;

The allocating module 1303 is configured to use the pilot sequence specified by the specific protocol as a pilot sequence of the first one of the multiple streams.

Optionally, in another embodiment, the preset phase shift sequence is

Optionally, in another embodiment, the selecting module 1302 is configured for each stream from the Among the plurality of pilot sequences of the stream, a pilot sequence that minimizes the value of the maximum correlation between the pilots of the different streams is selected.

Optionally, in another embodiment, the selecting module 1302 is configured to apply the following formula:

Optionally, the device further includes:

FIG. 14 is a schematic structural diagram of a channel demodulating apparatus according to an embodiment of the present invention. Referring to Figure 14, the apparatus includes:

The receiving module 1401 is configured to receive a transmission frame, where the transmission frame carries a pilot sequence specified by a specific protocol;

The channel estimation module 1402 is configured to perform channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information.

The first demodulation module 1403 is configured to demodulate a specified bit of the transmission frame according to the first channel information, and determine whether the scenario is a multi-stream transmission scenario;

The channel estimation module 1402 is further configured to: if the scenario is currently sent for multiple streams, estimate channel information of other streams according to the received pilot sequence, and after obtaining channel information of other streams, the first demodulation Module 1403 is configured to perform first demodulation on a data portion of a transmission frame of each stream;

The second demodulation module 1404 is configured to perform second demodulation on the data portion in the transmission frame if the scenario is currently sent for a single stream.

Optionally, the first demodulation is a multiple input multiple output MIMO mode, and the second demodulation is a single input single output SISO mode.

A site device provided by the embodiment of the present invention includes: a processor and multiple antennas; of course, the site device may further include a common component such as a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention There are no restrictions here.

A site device provided by an embodiment of the present invention, where the site device includes:

The processor and the plurality of antennas; of course, the site device may further include a common component such as a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention is not limited thereto.

The embodiment of the present invention further provides a site device, where the site device includes: a processor and multiple antennas; of course, the site device may further include a baseband processing component, a central radio frequency processing component, and an input and output device, and the like. There is no longer any limit here.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A method for generating a pilot sequence, comprising:

Dividing a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, the first subsequence being the same as the symbol included in the last subsequence;

Selecting, from the first number of subsequences, a second number of consecutive subsequences as a base sequence, the second number being less than the first number, and the difference between the second number and the first number is 1;

Performing a cyclic shift on the number of symbols included in one subsequence, shifting the base sequence to obtain a third number of shift sequences, the third number being less than the second number, and the third The difference between the number and the second number is greater than or equal to 1;

Obtaining a third number of pilot sequences according to the symbols included in the third sub-shift sequence and the specified sub-sequence in each of the third sequence of shift sequences;

The pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different streams in the plurality of streams.
The method according to claim 1, wherein selecting a second number of consecutive subsequences as the base sequence from the first number of subsequences comprises:

Selecting, from the first to the subsequences, a second number of consecutive subsequences as a base sequence in a front-to-back order; or

From the first number of subsequences, a second number of consecutive subsequences are selected as the base sequence in order from back to front.
The method according to claim 1, wherein, according to the symbols included in the specified subsequence in each of the third number of shift sequences and the third number of shift sequences, Obtaining a third number of pilot sequences includes:

For each of the third number of shifted sequences, the last of the shifted sequences A symbol in a subsequence is added to the front of the shifted sequence to obtain a pilot sequence corresponding to the shifted sequence; or

Adding, to each of the third number of shift sequences, a symbol in the first subsequence of the shift sequence to the rear of the shift sequence, to obtain the shift sequence corresponding Pilot sequence.
The method according to claim 1, wherein the pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different streams in the plurality of streams, including:

The pilot sequence specified by the specific protocol is used as the pilot sequence of the first stream.
The method according to claim 1, wherein the pilot sequence specified by the specific protocol is a pilot sequence in 802.11ad, and the first number is 9.
A method for generating a pilot sequence, comprising:

Performing phase shift on a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

Determining, according to the correlation between the pilot sequence specified by the specific protocol and the plurality of pilot sequences of each stream, for each stream, selecting one pilot sequence from the plurality of pilot sequences as the Streaming pilot sequence;

The pilot sequence specified by the specific protocol is used as a pilot sequence of the first of the plurality of streams.
The method of claim 6 wherein said predetermined phase shift sequence is
Where m = 1, ..., M, M is the number of streams, Δ m ∈ {0, N-1}, n = 0, ..., 1151.
The method of claim 6 wherein the guidance is based on said specific protocol a frequency sequence and a correlation between the two pilot sequences of each stream, for each stream, selecting a pilot sequence from the plurality of pilot sequences as the pilot sequence of the stream includes:

For each stream, from among the plurality of pilot sequences of the stream, a pilot sequence that minimizes the value of the correlation of the pilots of the different streams to each other is minimized.
The method according to claim 8, wherein for each stream, from among a plurality of pilot sequences of the stream, a guide that minimizes a value that minimizes correlation between pilots of different streams is selected. The frequency sequence is obtained by applying the following formula:

Where cε m1 (n) is the pilot sequence of the m1th stream, N g =128, 0≤l≤N-1, N=1024, 0≤n≤N.
The method according to claim 1 or 6, wherein the method further comprises:

When the multi-stream transmission is used, the indication field is carried in the transmission frame sent by the first stream, and the indication field is used to indicate that the scene is currently sent in multiple streams and the number of streams.
A channel demodulation method, comprising:

Receiving a transmission frame, the transmission frame carrying a pilot sequence specified by a specific protocol;

Performing channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information;

Demodulating a specified bit of the transmission frame according to the first channel information, and determining whether it is a multi-stream transmission scenario;

If the scenario is currently sent for multiple streams, channel information of other streams is estimated according to the received pilot sequence, and after obtaining channel information of other streams, the data portion of the transmission frame of each stream is first demodulated;

If the scene is currently transmitted for a single stream, a second demodulation is performed on the data portion of the transmission frame.
The method according to claim 11, wherein the first demodulation is a multiple input multiple output MIMO mode, and the second demodulation is a single input single output SISO mode.
An apparatus for generating a pilot sequence, comprising:

a dividing module, configured to divide a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, the first subsequence being the same as the symbol included in the last subsequence;

a selection module, configured to select, from the first number of sub-sequences obtained by the dividing module, a second number of consecutive sub-sequences as a base sequence, where the second number is smaller than the first number, and The difference between the second number and the first number is 1;

a shifting module, configured to cyclically shift the base sequence selected by the selection module by using a number of symbols included in one subsequence as a shift displacement, to obtain a third number of shift sequences, and the third The number is smaller than the second number, and the difference between the third number and the second number is greater than or equal to 1;

a pilot sequence generating module, configured to be included according to the third number of shift sequences obtained by the shifting module and the specified subsequence in each of the third number of shift sequences Symbol, obtaining a third number of pilot sequences;

And an allocating module, configured to use the pilot sequence specified by the specific protocol and the third number of pilot sequences obtained by the pilot sequence generating module as pilot sequences of different streams in the multiple streams.
The apparatus according to claim 13, wherein said selecting module is configured to select a second number of consecutive sub-sequences as a base sequence from the first to the following sub-sequences in a front-to-back order; Alternatively, the selecting module is configured to select, from the first number of sub-sequences, a second number of consecutive sub-sequences as a base sequence in a back-to-front order.
The apparatus according to claim 13, wherein said pilot sequence generating module is Adding, to each of the third number of shifted sequences, a symbol in a last subsequence of the shifted sequence to a front of the shifted sequence, to obtain a corresponding a pilot sequence generating module; or the pilot sequence generating module is configured to add a symbol in a first subsequence of the shifted sequence for each of the third number of shifted sequences After the shift sequence, a pilot sequence corresponding to the shifted sequence is obtained.
The apparatus according to claim 13, wherein said allocating module is configured to use the pilot sequence specified by said specific protocol as a pilot sequence of the first stream.
The apparatus according to claim 13, wherein the pilot sequence specified by the specific protocol is a pilot sequence in 802.11ad, and the first number is 9.
An apparatus for generating a pilot sequence, comprising:

a phase shifting module, configured to phase shift a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

a selection module for selecting a pilot sequence according to the specific protocol and a correlation between a plurality of pilot sequences of each stream, for each stream, selecting a guide from the plurality of pilot sequences a frequency sequence as a pilot sequence of the stream;

And an allocation module, configured to use the pilot sequence specified by the specific protocol as a pilot sequence of the first one of the multiple streams.
The device according to claim 18, wherein said preset phase shift sequence is
Where m = 1, ..., M, M is the number of streams, Δ m ∈ {0, N-1}, n = 0, ..., 1151.
The device of claim 18 wherein said selection module is for each The stream, from among the plurality of pilot sequences of the stream, selects a pilot sequence that minimizes the value of the maximum correlation between the pilots of the different streams.
The apparatus of claim 20 wherein said selection module is operative to apply the following formula:

Where cε m1 (n) is the pilot sequence of the m1th stream, N g =128, 0≤l≤N-1, N=1024, 0≤n≤N.
The device according to claim 13 or 18, wherein the device further comprises:

The sending module is configured to carry an indication field in the transmission frame sent by the first stream when the multi-stream transmission is used, where the indication field is used to indicate that the scenario is currently sent by the multi-stream and the number of streams.
A channel demodulating device, comprising:

a receiving module, configured to receive a transmission frame, where the transmission frame carries a pilot sequence specified by a specific protocol;

a channel estimation module, configured to perform channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information;

a first demodulation module, configured to demodulate a specified bit of the transmission frame according to the first channel information, and determine whether the scenario is a multi-stream transmission scenario;

The channel estimation module is further configured to: if the scenario is currently being sent by the multi-stream, estimate channel information of other streams according to the received pilot sequence, and after obtaining channel information of other streams, the first demodulation module For performing first demodulation on a data portion of a transmission frame of each stream;

And a second demodulation module, configured to perform second demodulation on the data portion in the transmission frame if the scenario is currently sent for a single stream.
The apparatus according to claim 23, wherein said first demodulation is a multiple input multiple output MIMO mode, and said second demodulation is a single input single output SISO mode.
A site device, comprising: a processor and a plurality of antennas;

The processor is configured to divide a pilot sequence specified by a specific protocol into a first number of subsequences, each subsequence including the same number of symbols, and symbols included in the first subsequence and the last subsequence the same;

Selecting, from the first number of subsequences, a second number of consecutive subsequences as a base sequence, the second number being less than the first number, and the difference between the second number and the first number is 1;

Performing a cyclic shift on the number of symbols included in one subsequence, shifting the base sequence to obtain a third number of shift sequences, the third number being less than the second number, and the third The difference between the number and the second number is greater than or equal to 1;

Obtaining a third number of pilot sequences according to the symbols included in the third sub-shift sequence and the specified sub-sequence in each of the third sequence of shift sequences;

The pilot sequence specified by the specific protocol and the third number of pilot sequences are respectively used as pilot sequences of different streams in the plurality of streams.
A site device, comprising:

a processor and a plurality of antennas;

The processor is configured to phase shift a pilot sequence specified by a specific protocol based on a preset phase shift sequence to obtain a plurality of pilot sequences for each stream;

Determining, according to the correlation between the pilot sequence specified by the specific protocol and the plurality of pilot sequences of each stream, for each stream, selecting one pilot sequence from the plurality of pilot sequences as the Streaming pilot sequence;

The pilot sequence specified by the specific protocol is used as a pilot sequence of the first of the plurality of streams.
A site device, comprising:

a processor and a plurality of antennas;

Wherein the processor is configured to:

Receiving a transmission frame, the transmission frame carrying a pilot sequence specified by a specific protocol;

Performing channel estimation according to the pilot sequence specified by the specific protocol, to obtain first channel information;

Demodulating a specified bit of the transmission frame according to the first channel information, and determining whether it is a multi-stream transmission scenario;

If the scenario is currently sent for multiple streams, channel information of other streams is estimated according to the received pilot sequence, and after obtaining channel information of other streams, the data portion of the transmission frame of each stream is first demodulated;

If the scene is currently transmitted for a single stream, a second demodulation is performed on the data portion of the transmission frame.