CN110838900B - Method for generating frequency domain main signal of leading symbol with variable bandwidth - Google Patents
Method for generating frequency domain main signal of leading symbol with variable bandwidth Download PDFInfo
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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
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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Abstract
The invention provides a method for generating a frequency domain main body signal of a leading symbol with variable bandwidth, which comprises the following steps: step 1: generating a frequency domain main sequence set according to a preset sequence generation rule; step 2: selecting one sequence as a frequency domain main sequence from the frequency domain main sequence set according to a signaling to be transmitted; and step 3: and loading the frequency domain main body sequence to a frequency domain subcarrier according to the selected frequency domain main body sequence by a preset filling rule to form a frequency domain main body signal of the preamble symbol. Based on the preamble symbol generated by the frequency domain main signal generation method provided by the invention, after the receiver finishes blind detection on the first OFDM symbol, the receiver can adaptively adjust the receiving scheme according to the analyzed bandwidth signaling, thereby fully utilizing the bandwidth resource during preamble symbol transmission on the premise of ensuring system compatibility.
Description
Technical Field
The present invention relates to the field of communication signal processing technologies, and in particular, to a method for generating a frequency domain main signal of a preamble symbol with a variable bandwidth. And more particularly, to a method for generating a frequency domain main signal of a preamble symbol applied to a scenario of cooperative transmission between a mobile communication network and a terrestrial digital television broadcasting network.
Background
The preamble symbol is an important component in a wireless communication system, and has extremely high design flexibility because the receiving method is almost independent from the data part. The signal has the functions of signal detection, synchronization, equalization, signaling transmission and the like, and is the part with the lowest threshold of the received signal-to-noise ratio in the whole system. With the increasing abundance of diversified media services and the rapid development of mobile terminal services. In recent years, the application of a terrestrial digital television broadcast transmission mode (DTTB) to mobile terminals has received much attention from the broadcasting industry. In addition, the cooperative transmission of DTTB with a mobile broadband communication system has attracted the attention of more and more researchers due to its high transmission efficiency. In the time division multiplexing mode, the preamble symbols can be used for system wake-up and fast blind detection, and carry system indication information to help a receiver perform corresponding configuration. Therefore, the high-robustness preamble symbol with the signaling transmission function and adapted to various mainstream wireless transmission systems is an important component of a future converged network system.
Compared with the traditional fixed reception, the channel environment experienced by the signal received by the mobile terminal is more complex, and the high doppler shift and strong multipath interference in a high-speed mobile scene put higher requirements on the robustness of system synchronization. In addition, as the application scenarios of wireless systems are becoming more abundant, the design of the current physical layer signal needs to meet different application requirements, such as adapting to different terminals and providing video services of different qualities. Therefore, signaling information needs to be added before the payload part to indicate the parameter configuration of the receiver, and as the applications become richer, the signaling transmission capacity needs to be continuously increased. The preamble symbol Bootstrap of the ATSC3.0 system adopts a mode that a plurality of OFDM symbols are cascaded on a time domain, each OFDM symbol transmits 8-bit system information, and signaling transmission with any capacity can be realized theoretically. Signaling can be demodulated for the Bootstrap signal in an iterative mode, namely after the former OFDM symbol is demodulated, the signal can be used as a known signal for channel estimation, then the channel estimation result is used for the next symbol for equalization, and finally signaling demodulation is carried out. By using the iterative method, the Bootstrap signal still has better signaling demodulation performance in a severe channel environment. Meanwhile, the bandwidth of Bootstrap signals is 4.5MHz, which is lower than the commonly used bandwidths of a terrestrial digital television broadcasting system, such as 6MHz and 8MHz, and is also lower than the commonly used bandwidth of a mobile broadband communication system, such as 5M/10M/20 MHz. Thus, the Bootstrap symbol is suitable as a unified preamble symbol for different wireless transmission systems.
Bootstrap of ATSC3.0 adopts a time domain cyclic shift mode to transmit signaling, and utilizes the autocorrelation characteristic of a time domain sequence, and the transmission performance of the signaling transmission scheme under a 0dB echo channel is poor. In addition, in order to achieve compatibility with the bandwidth of the mobile broadband communication system, the frequency domain sequence length of the Bootstrap signal occupying a 4.5MHz bandwidth is 1499, and thus up to 548 subcarriers are zero padded in addition to the dc component. The method limits the time-frequency domain autocorrelation characteristic of the sequence on one hand, and influences the frequency domain equalization performance during iteration on the other hand, thereby generating adverse influence on the signaling demodulation performance. In view of the above-mentioned problems of preamble symbols, we propose a method for generating a frequency domain main signal of preamble symbols adaptive to the bandwidth of a mobile communication network and a digital television broadcasting network, and a uniform preamble symbol having a better signaling demodulation performance can be generated by using this method compared with a Bootstrap symbol.
Disclosure of Invention
In view of the defects in the prior art, the present invention aims to provide a method for generating a frequency domain main signal of a preamble symbol with variable bandwidth.
The invention provides a method for generating a frequency domain main signal of a preamble symbol with variable bandwidth, which comprises the following steps:
step 1: generating a frequency domain main sequence set according to a preset sequence generation rule;
step 2: selecting one sequence as a frequency domain main sequence from the frequency domain main sequence set according to a signaling to be transmitted;
and step 3: and loading the frequency domain main body sequence to a frequency domain subcarrier according to the selected frequency domain main body sequence by a preset filling rule to form a frequency domain main body signal of the preamble symbol.
Preferably, the preamble symbol is composed of a plurality of OFDM symbols concatenated in the time domain;
the OFDM symbols are obtained by performing Fourier inversion on frequency domain main signals;
the bandwidth occupied by the frequency domain main body signal corresponding to each OFDM symbol is determined by the type of a transmission network;
a first OFDM symbol in the OFDM symbols carries a bandwidth indication signaling, and the bandwidth indication signaling represents the bandwidth occupied by the preamble symbol;
the bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is controlled by the preset sequence length N of the frequency domain main sequence set, and is characterized by the leading symbol bandwidth signaling carried by the first OFDM symbol, and the preset sequence length N of the frequency domain main sequence set is determined by the type of a transmission network.
Preferably, the step 1 comprises:
step 1.1: generating a constant envelope zero autocorrelation (CAZAC) sequence set with the sequence length of Ntot1 by using different root values to form a frequency domain sequence candidate set A; generating a Gold sequence set with the sequence length of Ntot2 by utilizing a pseudo-random m sequence optimization pair, and forming a frequency domain sequence candidate set B after binary phase shift keying BPSK modulation;
step 1.2: selecting Ntot elements in part or all of the sequences in the frequency domain sequence candidate set A to be correspondingly multiplied with Ntot elements in part or all of the sequences in the frequency domain sequence candidate set B, and forming a frequency domain combined sequence candidate set C with the sequence length of Ntot by using all the sequences obtained after multiplication;
step 1.3: sequencing elements in the frequency domain combined sequence candidate set C according to a preset sequencing rule, and taking part or all of the frequency domain combined sequence candidate set C according to a preset extraction rule to form a frequency domain combined sequence set;
step 1.4: and for each sequence in the frequency domain combined sequence set, continuously taking N elements with a preset length from a preset position m to obtain subsequences, and forming a frequency domain main sequence set with the sequence length of N.
Preferably, the step 1.1 of constructing the frequency domain sequence candidate set a includes:
A＝Z
wherein the content of the first and second substances,
z represents a sequence set with a length of Ntot1 formed by constant envelope zero autocorrelation CAZAC sequences with a root value of a;
z (k) denotes the value of the generated CAZAC sequence at index k;
e represents the base of the natural logarithm;
j represents an imaginary unit;
pi represents a circumferential ratio;
k denotes an index of an element in the generated CAZAC sequence;
a represents a root value;
a denotes a set of frequency domain sequences of length Ntot1 formed using constant-envelope zero-autocorrelation CAZAC sequences of root a.
Preferably, the step 1.1 of constructing the frequency domain sequence candidate set B includes:
g1(x)＝x11+x2+1
g2(x)＝x11+x8+x5+x2+1
B1＝[M,T1]
B＝1-2·B1
wherein the content of the first and second substances,
g1(x)、g2(x) A generator polynomial representing a preferred pair of m sequences;
x represents an element;
m represents a preferred pair T using the above M-sequence1And T2Generating an initial set of Gold sequences with the sequence length of Ntot2 by using a shift modulo two addition operation;
m (l, k1) represents the value of the k1 th element in the l-th sequence in the generated initial set of Gold sequences;
T1generator polynomial g representing preferred pairs using m-sequences1(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1);
T2generator polynomial g representing preferred pairs using m-sequences2(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1);
mod (k1+ l, Ntot2) denotes the remainder for the value of k1+ l divided by Ntot 2;
T1(mod (k1+ l, Ntot2)) represents the sequence T1Value at index mod (k1+ l, Ntot2)
l is the serial number index of the Gold sequence initial set, l is more than or equal to 0 and less than or equal to Ntot2-1, and l is an integer;
k1 denotes the index of the element in each sequence in the generated initial set of Gold sequences, k1 is a positive integer;
B1representing the initial set M of Gold sequences and the M-sequence T1Merging to form a frequency domain sequence initial candidate set B with the sequence length of Ntot2 and the sequence number of Ntot2+11；
B denotes an initial candidate set B of frequency domain sequences1The 0/1 sequences in (1) are converted into bipolar sequences, and a frequency domain sequence candidate set B is generated.
Preferably, said step 1.2 comprises:
wherein the content of the first and second substances,
Cl1representing the sequence with the sequence number index l1 in the generated frequency domain combined sequence candidate set C;
ANtotrepresenting a sequence consisting of Ntot elements of the sequences in the frequency domain sequence candidate set A;
x represents the one-to-one multiplication of elements in the two-sided sequence of the multiplication sign.
Preferably, the predetermined ordering rule comprises:
and respectively carrying out periodic autocorrelation operation on each sequence in the frequency domain combined sequence candidate set C, sequencing each sequence in the frequency domain combined sequence candidate set C from large to small according to the peak-to-average power ratio, and increasing the number from 0.
The predetermined extraction rule includes:
leading symbols are obtained by combining OFDM symbols obtained by performing inverse Fourier transform on frequency domain main signals and time domain main signals in a time domain, and the symbol number index of the time domain main signals corresponding to the frequency domain main signals one by one is set to be L, wherein L is a positive integer larger than 0;
when L is 1, when the L-th time domain main signal is generated, 2 sequences numbered 0 and 1 in the frequency domain combined sequence candidate set C are taken to form a frequency domain combined sequence set;
and when L is larger than 1, when the subsequent L-th time domain main body signal is generated, selecting 256 sequences numbered from 2+256 (L-2) to 1+256 (L-1) in the frequency domain combination sequence candidate set to form a frequency domain combination sequence set.
The predetermined sequence selection rule comprises:
step 2.1: converting the signaling to be transmitted into a decimal representation form;
step 2.2: and corresponding the decimal signaling information to elements in the frequency domain main sequence set according to the equivalent value of the number to obtain the frequency domain main sequences corresponding to the signaling information one by one.
Preferably, said step 2.1 comprises:
when the original signaling information is represented in a binary form, gray coding is carried out on the signaling information to obtain coded binary signaling information, and then the coded binary signaling information is converted into a decimal form to be represented;
when the original signaling information is represented in a non-binary manner, the original signaling information is firstly converted into a binary form to be represented, then the converted binary signaling information is gray coded to obtain coded signaling information, and then the coded signaling information is converted into a decimal form to be represented.
Preferably, the predetermined filling rule comprises:
the preset sequence length N of the main sequence set is not more than the Fourier transform length Nfft of the main signal in the frequency domain, and the main sequence in the frequency domain is mapped into a positive frequency subcarrier and a negative frequency subcarrier by referring to the preset sequence length N;
and filling a preset number of virtual subcarriers and direct current subcarriers at the outer edges of the positive frequency subcarriers and the negative frequency subcarriers according to the Fourier transform length Nfft to generate a frequency domain main body signal.
Preferably, the expression for generating the frequency domain subject signal is:
wherein the content of the first and second substances,
l represents a symbol number index value of the time domain body signal corresponding one-to-one to the frequency domain body signal;
tau is a decimal representation form of the signaling to be transmitted;
k2 denotes a subcarrier index value;
ntot represents the length of each sequence in the frequency domain combined sequence candidate set C;
n represents a predetermined sequence length N of the set of frequency domain subject sequences;
a predetermined sequence length N representing a set of frequency domain subject sequences divided by 2;
Compared with the prior art, the invention has the following beneficial effects:
based on the preamble symbol generated by the frequency domain main signal generation method provided by the invention, after the receiver finishes blind detection on the first OFDM symbol, the receiver can adaptively adjust the receiving scheme according to the analyzed bandwidth signaling, thereby fully utilizing the bandwidth resource during preamble symbol transmission on the premise of ensuring system compatibility.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of an application of preamble symbols generated by a frequency domain main signal in a scenario of cooperative transmission between a mobile communication network and a terrestrial digital television broadcasting network in a time division multiplexing manner according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of a method for generating a frequency domain main signal of preamble symbols adaptive to bandwidths of a mobile communication network and a digital television broadcasting network according to a preferred embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the signaling transmission performance of the preamble symbol generated by the frequency domain main signal according to the preferred embodiment of the present invention compared with the preamble symbol bootstrapping of the ATSC3.0 standard under the 0dB multipath channel;
fig. 4 is a schematic diagram of the performance of signaling transmission of the preamble symbol generated by the frequency domain main signal according to the preferred embodiment of the present invention compared with the preamble symbol bootstrapping of the ATSC3.0 standard under the TU6 channel;
fig. 5 is a flowchart illustrating a method for generating a frequency domain main signal of variable bandwidth preamble symbols according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 5, the present invention provides a method for generating a frequency domain main signal of a preamble symbol with variable bandwidth, including:
step S101: generating a frequency domain main sequence set according to a preset sequence generation rule;
step S102: selecting one sequence as a frequency domain main sequence from the frequency domain main sequence set according to a signaling to be transmitted;
step S103: and loading the frequency domain main body sequence to a frequency domain subcarrier according to the selected frequency domain main body sequence by a preset filling rule to form a frequency domain main body signal of the preamble symbol.
Specifically, the preamble symbol is formed by cascading a plurality of OFDM symbols in a time domain;
the OFDM symbols are obtained by performing Fourier inversion on frequency domain main signals;
the bandwidth occupied by the frequency domain main body signal corresponding to each OFDM symbol is determined by the type of a transmission network;
a first OFDM symbol in the OFDM symbols carries a bandwidth indication signaling, and the bandwidth indication signaling represents the bandwidth occupied by the preamble symbol;
the bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is controlled by the preset sequence length N of the frequency domain main sequence set, and is characterized by the leading symbol bandwidth signaling carried by the first OFDM symbol, and the preset sequence length N of the frequency domain main sequence set is determined by the type of a transmission network.
Specifically, the step S101 includes:
step 1.1: generating a constant envelope zero autocorrelation (CAZAC) sequence set with the sequence length of Ntot1 by using different root values to form a frequency domain sequence candidate set A; generating a Gold sequence set with the sequence length of Ntot2 by utilizing a pseudo-random m sequence optimization pair, and forming a frequency domain sequence candidate set B after binary phase shift keying BPSK modulation;
step 1.2: selecting Ntot elements in part or all of the sequences in the frequency domain sequence candidate set A to be correspondingly multiplied with Ntot elements in part or all of the sequences in the frequency domain sequence candidate set B, and forming a frequency domain combined sequence candidate set C with the sequence length of Ntot by using all the sequences obtained after multiplication;
step 1.3: sequencing elements in the frequency domain combined sequence candidate set C according to a preset sequencing rule, and taking part or all of the frequency domain combined sequence candidate set C according to a preset extraction rule to form a frequency domain combined sequence set;
step 1.4: and for each sequence in the frequency domain combined sequence set, continuously taking N elements with a preset length from a preset position m to obtain subsequences, and forming a frequency domain main sequence set with the sequence length of N.
Specifically, the step 1.1 of constructing the frequency domain sequence candidate set a includes:
A＝Z
wherein the content of the first and second substances,
z represents a sequence set with a length of Ntot1 formed by constant envelope zero autocorrelation CAZAC sequences with a root value of a;
z (k) denotes the value of the generated CAZAC sequence at index k;
e represents the base of the natural logarithm;
j represents an imaginary unit;
pi represents a circumferential ratio;
k denotes an index of an element in the generated CAZAC sequence;
a represents a root value;
a denotes a set of frequency domain sequences of length Ntot1 formed using constant-envelope zero-autocorrelation CAZAC sequences of root a.
Specifically, the step 1.1 of constructing the frequency domain sequence candidate set B includes:
g1(x)＝x11+X2+1
g2(x)＝x11+x8+x5+x2+1
B1＝[M,T1]
B＝1-2·B1
wherein the content of the first and second substances,
g1(X)、g2(X) a generator polynomial representing a preferred pair of m sequences;
x represents an element; further, x represents an indeterminate element;
m represents a preferred pair T using the above M-sequence1And T2Generating an initial set of Gold sequences with the sequence length of Ntot2 by using a shift modulo two addition operation;
m (l, k1) represents the value of the k1 th element in the l-th sequence in the generated initial set of Gold sequences;
T1generator polynomial g representing preferred pairs using m-sequences1(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1);
T2generator polynomial g representing preferred pairs using m-sequences2(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1); further, referring to the prior art, those skilled in the art can realize that the m-sequence T can be generated according to the generating polynomial of the m-sequence preferred pair and the state of the shift register1、T2Herein do notAre described in detail;
mod (k1+ l, Ntot2) denotes the remainder for the value of k1+ l divided by Ntot 2;
T1(mod (k1+ l, Ntot2)) represents the sequence T1Value at index mod (k1+ l, Ntot2)
l is the serial number index of the Gold sequence initial set, l is more than or equal to 0 and less than or equal to Ntot2-1, and l is an integer;
k1 denotes the index of the element in each sequence in the generated initial set of Gold sequences, k1 is a positive integer;
B1representing the initial set M of Gold sequences and the M-sequence T1Merging to form a frequency domain sequence initial candidate set B with the sequence length of Ntot2 and the sequence number of Ntot2+11；
B denotes an initial candidate set B of frequency domain sequences1The 0/1 sequences in (1) are converted into bipolar sequences, and a frequency domain sequence candidate set B is generated.
Specifically, the step 1.2 includes:
wherein the content of the first and second substances,
Cl1representing the sequence with the sequence number index l1 in the generated frequency domain combined sequence candidate set C;
ANtotrepresenting a sequence consisting of Ntot elements of the sequences in the frequency domain sequence candidate set A;
x represents the one-to-one multiplication of elements in the two-sided sequence of the multiplication sign.
Specifically, the predetermined ordering rule includes:
and respectively carrying out periodic autocorrelation operation on each sequence in the frequency domain combined sequence candidate set C, sequencing each sequence in the frequency domain combined sequence candidate set C from large to small according to the peak-to-average power ratio, and increasing the number from 0.
The predetermined extraction rule includes:
leading symbols are obtained by combining OFDM symbols obtained by performing inverse Fourier transform on frequency domain main signals and time domain main signals in a time domain, and the symbol number index of the time domain main signals corresponding to the frequency domain main signals one by one is set to be L, wherein L is a positive integer larger than 0;
when L is 1, when the L-th time domain main signal is generated, 2 sequences numbered 0 and 1 in the frequency domain combined sequence candidate set C are taken to form a frequency domain combined sequence set;
and when L is larger than 1, when the subsequent L-th time domain main body signal is generated, selecting 256 sequences numbered from 2+256 (L-2) to 1+256 (L-1) in the frequency domain combination sequence candidate set to form a frequency domain combination sequence set.
The predetermined sequence selection rule comprises:
step 2.1: converting the signaling to be transmitted into a decimal representation form;
step 2.2: and corresponding the decimal signaling information to elements in the frequency domain main sequence set according to the equivalent value of the number to obtain the frequency domain main sequences corresponding to the signaling information one by one.
In particular, said step 2.1 comprises:
when the original signaling information is represented in a binary form, gray coding is carried out on the signaling information to obtain coded binary signaling information, and then the coded binary signaling information is converted into a decimal form to be represented; further, those skilled in the art can implement gray coding on the signaling information by referring to the prior art, which is not described herein again.
When the original signaling information is represented in a non-binary manner, the original signaling information is firstly converted into a binary form to be represented, then the converted binary signaling information is gray coded to obtain coded signaling information, and then the coded signaling information is converted into a decimal form to be represented.
Specifically, the predetermined filling rule includes:
the preset sequence length N of the main sequence set is not more than the Fourier transform length Nfft of the main signal in the frequency domain, and the main sequence in the frequency domain is mapped into a positive frequency subcarrier and a negative frequency subcarrier by referring to the preset sequence length N;
and filling a preset number of virtual subcarriers and direct current subcarriers at the outer edges of the positive frequency subcarriers and the negative frequency subcarriers according to the Fourier transform length Nfft to generate a frequency domain main body signal.
Specifically, the expression for generating the frequency domain subject signal is:
wherein the content of the first and second substances,
l represents a symbol number index value of the time domain body signal corresponding one-to-one to the frequency domain body signal;
tau is a decimal representation form of the signaling to be transmitted;
k2 denotes a subcarrier index value;
ntot represents the length of each sequence in the frequency domain combined sequence candidate set C;
n represents a predetermined sequence length N of the set of frequency domain subject sequences;
a predetermined sequence length N representing a set of frequency domain subject sequences divided by 2;
Further, when the sampling rate of 6.144MHz and the fourier transform length Nfft of the frequency domain subject signal are 2048, and when the preamble symbol bandwidth signaling represents 4.5MHz, a frequency domain subject sequence set is formed by subsequences obtained by continuously taking 1498 elements from the 275 th position of each sequence in the frequency domain combined sequence set; when the preamble symbol bandwidth signaling represents 6MHz, a frequency domain main body sequence set is formed by taking sequences obtained by continuously taking all 2047 elements from the 1 st position of each sequence in the frequency domain combination sequence set.
The invention is described in more detail below by way of preferred examples:
example 1:
the invention provides a frequency domain main signal generating method based on a leading symbol of an OFDM system under the scene of carrying out cooperative transmission by a mobile communication network and a ground digital television broadcasting network in a time division multiplexing mode, wherein the leading symbol is formed by cascading a plurality of OFDM symbols, the bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is determined by the type of a transmission network, wherein the first OFDM symbol needs to carry a bandwidth signaling to represent the bandwidth occupied by the leading symbol; under different transmission networks, the frequency domain main body signal corresponding to each OFDM symbol is generated by adopting the same generation rule.
The generation rule of the frequency domain main body signal comprises the following steps:
step S1, generating a frequency domain subject sequence set according to a predetermined sequence generation rule;
step S2, selecting a sequence from the frequency domain subject sequence set as a frequency domain subject sequence according to a preset sequence selection rule;
step S3, loading the frequency domain main body sequence on the frequency domain subcarrier according to the preset filling rule to form a frequency domain main body signal;
alternatively, the predetermined sequence generation rule in step S1 includes the following two steps:
step SA 1: generating a constant-envelope zero autocorrelation (CAZAC) sequence with a sequence length Ntot1 of 2047 by using different root values a to form a frequency domain sequence candidate set a, where optionally, the value of the root value a is 139, the number of sequences in the frequency domain sequence candidate set a is 1, and may be represented as:
wherein the content of the first and second substances,
e denotes the base of the natural logarithm
Pi denotes the circumferential ratio
k denotes an index of an element in the generated CAZAC sequence
Z (k) denotes the value of the generated CAZAC sequence at index k
Generating a Gold sequence set with a sequence length Ntot2 of 2047 by using an m-sequence preferred pair, and then forming a frequency domain sequence candidate set B after BPSK modulation, wherein optionally, a generator polynomial of the m-sequence preferred pair is expressed as follows, and initial states of two shift registers are [ 00000000001 ]:
g1(x)＝x11+x2+1
g2(x)＝x11+x8+x5+x2+1
the number of sequences in the frequency domain sequence candidate set B is 2048.
And step SA2, the sequences in the frequency domain sequence candidate set A are taken and correspondingly multiplied with all 2048 sequences in the frequency domain sequence candidate set B respectively to obtain a frequency domain combined sequence candidate set with the sequence length of 2047.
And step SA3, after the elements in the frequency domain combined sequence candidate set are sorted according to a preset sorting rule, and a part or all of the frequency domain combined sequence candidate set is selected according to a preset extraction rule to form a frequency domain combined sequence set.
Optionally, a periodic autocorrelation operation is performed on each sequence in the frequency domain combined sequence candidate set, the peak-to-average power ratio is taken as a parameter, and each sequence is sorted from large to small according to the peak-to-average power ratio and is numbered in an increasing manner from 0.
Alternatively, the preamble symbol is obtained by combining OFDM symbols, which are obtained by performing inverse fourier transform on the frequency domain main signal, i.e., time domain main signals in the time domain, and when the preamble symbol is generated by a plurality of time domain main signals, the number of symbols of the time domain main signals corresponding to the frequency domain main signals one to one is incremented from 1 and is numbered L.
Optionally, when L is 1, 2 sequences numbered 0 and 1 in the frequency domain combined sequence candidate set are taken to form a frequency domain combined sequence set; and when L is larger than 1, taking 256 sequences numbered from 2+256 (L-2) to 1+256 (L-1) in the frequency domain combined sequence candidate set to form a frequency domain combined sequence set.
Step SA4: continuously taking N elements with preset length from a preset position m for each sequence in the frequency domain combined sequence set to obtain subsequences which form a frequency domain main sequence set;
the bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is controlled by a predetermined sequence length N of the frequency domain main sequence set, and is indicated by a signaling carried by the first OFDM symbol, and the sequence length N is determined by the type of the transmission network.
Optionally, when the sampling rate of 6.144MHz and the fourier transform length Nfft of the frequency domain subject signal are 2048, and when the preamble symbol bandwidth signaling represents 4.5MHz, forming a frequency domain subject sequence set by subsequences obtained by continuously taking 1498 elements from the 275 th position of each sequence in the frequency domain combined sequence set;
when the preamble symbol bandwidth signaling represents 6MHz, a frequency domain main body sequence set is formed by taking sequences obtained by continuously taking all 2047 elements from the 1 st position of each sequence in the frequency domain combination sequence set.
Optionally, the predetermined sequence selection rule in step S2 includes the following two steps:
step SC 1: converting the signaling to be transmitted into a decimal representation form according to a preset conversion rule;
optionally, when the original signaling information is represented in a binary form, gray coding is performed on the signaling information to obtain coded binary signaling information, and then the coded binary signaling information is converted into a decimal form to be represented;
when the original signaling information is represented in a non-binary manner, the original signaling information is firstly converted into a binary form to be represented, then the converted binary signaling information is gray coded to obtain coded signaling information, and then the coded signaling information is converted into a decimal form to be represented.
Step SC 2: and the decimal signaling information corresponds to the sequences in the frequency domain main body sequence set according to a preset corresponding rule to obtain the frequency domain main body sequences corresponding to the signaling information one by one.
Optionally, the predetermined correspondence rule in step SC2 is further characterized by taking, as the frequency domain subject sequence, a sequence in the set of frequency domain subject sequences whose sequence number is equal to the decimal signaling information.
Alternatively, when the mobile communication network is used for transmission, the decimal signaling information of L ═ 1 is 0, and when the digital television broadcast network is used for transmission, the decimal signaling information of L ═ 1 is 1.
Optionally, the predetermined filling rule in step S3, wherein:
the frequency domain main body sequence has a predetermined length N which is not greater than a Fourier transform length Nfft of the time domain main body signal, the Nfft is 2048, and the frequency domain main body sequence is mapped into a positive frequency subcarrier and a negative frequency subcarrier by referring to the predetermined sequence length N;
with reference to the fourier transform length 2048, a predetermined number of virtual subcarriers and dc subcarriers are filled in the outer edges of the positive frequency subcarriers and negative frequency subcarriers to generate a frequency domain main signal. Wherein, let tau be decimal representation form of signaling to be transmitted, L be symbol number index of time domain subject signal corresponding to frequency domain subject signal one by one,
in order to generate the frequency-domain subject sequence,
in order to carry out the upper rounding operation,
for the rounding-down operation, the frequency domain main signal
The expression of (a) is:
k represents a subcarrier index value
Example 2:
the design of the preamble symbol is mainly divided into two steps: generation of a frequency domain main signal and insertion of a time domain guard interval. The insertion of the time domain guard interval mainly considers the insertion scheme of the prefix and the suffix, and is used for resisting multipath channel fading and realizing rapid signal detection and time-frequency domain coarse synchronization. The generation of the frequency domain main signal mainly considers the selection of a frequency domain sequence and a transmission scheme of system signaling, and is used for realizing high-precision time-frequency synchronization and high-robustness signaling transmission. The embodiment provides a method for generating a frequency domain main signal of a unified preamble symbol in a scenario where a mobile communication network and a terrestrial digital television broadcast network perform cooperative transmission in a time division multiplexing manner, where the preamble symbol may flexibly configure a bandwidth and has the characteristics of high robustness and high flexibility.
As shown in fig. 1, the preamble symbol is composed of a concatenation of a plurality of OFDM symbols, and appears at the forefront of the payload signal. The first OFDM symbol carries signaling representing a network type, and the signaling determines a frequency bandwidth occupied by the preamble symbol. Specifically, when the preamble symbol appears before the digital television broadcast frame, the bandwidth occupied by the preamble symbol is the same as the bandwidth occupied by the broadcast signal payload portion; when the preamble symbol occurs before the mobile communication frame, the preamble symbol occupies the same bandwidth as the smaller bandwidth occupied by the payload portion of the mobile communication signal. Since the mobile communication signal has a plurality of transmission modes, each of which occupies a large difference in bandwidth, considering compatibility in most cases, the preamble symbol occupies a bandwidth of 4.5MHz when it appears before the mobile communication frame. Because the preamble symbols are generated by adopting a uniform generation method in different systems, a uniform receiving method can be adopted at a receiving end to analyze signals. The occupied bandwidth is determined by the length of the frequency domain main body sequence corresponding to the frequency domain main body signal. The method for generating the frequency domain principal signal will be described in detail below.
As shown in fig. 2, the method for generating a frequency domain main signal of a preamble symbol according to this embodiment includes the following steps:
step S1, generating a frequency domain subject sequence set according to a predetermined sequence generation rule;
step S2, selecting a sequence from the frequency domain subject sequence set as a frequency domain subject sequence according to a preset sequence selection rule;
step S3, loading the frequency domain main body sequence on the frequency domain subcarrier according to the preset filling rule to form a frequency domain main body signal;
the step S1 includes:
step SA 1: generating a frequency domain sequence candidate set A with a sequence length of 2047 according to a predetermined sequence generating formula 1, and generating a frequency domain sequence candidate set B with a sequence length of 2047 according to a predetermined sequence generating formula 2;
the step SA1 includes:
step a1, a frequency domain sequence candidate set a of length 2047 is formed using constant envelope zero autocorrelation (CAZAC) sequences with a root value of 139, which set contains only one sequence element, i.e., a ═ Z:
step A2, generating two m-sequences T with length of 2047 respectively by using coefficients of generator polynomials of the following m-sequence preferred pairs1And T2The initial shift register state is [ 00000000001 ]]：
g1(x)＝x11+x2+1
g2(x)＝x11+x8+x5+x2+1
Step A3 preference for T using the two m-sequences1And T2Generating an initial set M of Gold sequences using a shift modulo two addition operation as follows:
where l is the sequence number index of the initial set of Gold sequences, and l is 0,1, …, 2046;
k denotes the index of the element in each sequence in the generated initial set of Gold sequences
mod (k + l,2047) denotes taking the remainder for the value of k + l divided by 2047
Step A4, initial set M of Gold sequences and M sequence T1Merging to form a frequency domain sequence initial candidate set B with the sequence length of 2047 and the sequence number of 20481I.e. B1＝[M,T1]；
Step A5, the frequency domain sequence is initially selected as a candidate set B1The 0/1 sequences in (1) are converted into bipolar sequences to generate a frequency domain sequence candidate set B, namely B is 1-2 · B1。
Step SA2: correspondingly multiplying the sequence elements in the frequency domain sequence candidate set A with all the sequence elements in the frequency domain sequence candidate set B to obtain a frequency domain combined sequence candidate set C with the sequence length of 2047, namely Cl＝A×BlWherein l is the sequence number index of the frequency domain sequence candidate set B;
Clrepresenting the sequence with sequence number index l in the generated frequency domain combined sequence candidate set C
BlSequence with sequence number index l in representing frequency domain sequence candidate set B
X represents the one-to-one multiplication operation of elements in the two-side sequence of the multiplication sign
And step SA3, performing periodic autocorrelation operation on each sequence in the frequency domain combined sequence candidate set C, sequencing each sequence from large to small according to the peak-to-average power ratio by taking the peak-to-average power ratio as a parameter, numbering the sequences in an increasing manner from 0, and numbering the time domain main body signals in an increasing manner from 1 to 4 to L. When L is 1, 2 sequences numbered 0 and 1 in the frequency domain combined sequence candidate set are taken to form a frequency domain combined sequence set; when L is more than 1, taking 256 sequences numbered from 2+256 (L-2) to 1+256 (L-1) in the frequency domain combined sequence candidate set to form a frequency domain combined sequence set;
step SA4, when the sampling rate of 6.144MHz and the Fourier transform length Nfft of the frequency domain main signal are 2048 and the pilot symbol bandwidth signaling represents 4.5MHz, forming a frequency domain main sequence set by subsequences obtained by continuously taking 1498 elements from the 275 th position of each sequence in the frequency domain combined sequence set; when the preamble symbol bandwidth signaling represents 6MHz, continuously taking all 2047 elements from the 1 st position of each sequence in the frequency domain combined sequence set to form a frequency domain main sequence set;
the step S2 includes:
step SC 1: converting the signaling to be transmitted into a decimal representation form, and specifically operating as follows:
when the original signaling information is represented in a binary form, gray coding is carried out on the signaling information to obtain coded binary signaling information, and then the coded binary signaling information is converted into a decimal form to be represented;
when the original signaling information is represented in a non-binary manner, the original signaling information is firstly converted into a binary form to be represented, then the converted binary signaling information is gray coded to obtain coded signaling information, and then the coded signaling information is converted into a decimal form to be represented.
The gray coding described above is described in detail as follows: assume binary signaling is represented as
NbFor signaling capacity, this embodiment takes N b8. Numbering the Gray coded signaling information in an increasing way from 0 according to bits to be i, wherein the bit number of the lowest bit information is 0, and then expressing the Gray coded signaling information as
The specific operation is as follows:
i denotes a position index of signaling information per bit after gray coding
miValue representing ith bit signaling information after Gray coding
mod2 represents a divide by 2 and remainder operation
And converting the gray coded binary signaling information into decimal system and expressing the decimal system as D.
Step SC 2: and taking the sequence with the sequence number equal to the decimal signaling information D in the frequency domain main sequence set as the frequency domain main sequence.
The step S3 includes:
and mapping the frequency domain main body sequence into positive frequency subcarriers and negative frequency subcarriers, and then filling a preset number of virtual subcarriers and direct current subcarriers in the outer edges of the positive frequency subcarriers and the negative frequency subcarriers by referring to the Fourier transform length 2048 to generate a frequency domain main body signal. Wherein, N is the length of the frequency domain main body sequence, 2047 and 1498 can be selected, which are respectively corresponding to 6MHz and 4.5MHz systems, tau is the decimal signal to be transmitted after conversion, L is the symbol number index of the time domain main body signal corresponding to the frequency domain main body signal one by one,
in order to generate the frequency-domain subject sequence,
in order to carry out the upper rounding operation,
for the rounding-down operation, the frequency domain main signal
The expression of (a) is:
as can be seen from fig. 3 and fig. 4, the preamble symbol obtained by the generation method according to the present invention can achieve better signaling transmission performance than boottrap under the condition of smaller bandwidth resources. In addition, in the terrestrial digital television broadcasting system, the bandwidth resource is fully utilized, so that the working threshold of the preamble symbol can be further reduced, and better signaling transmission performance can be obtained.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A method for generating a frequency domain main signal of variable bandwidth preamble symbols, comprising:
step 1: generating a frequency domain main sequence set according to a preset sequence generation rule;
step 2: selecting one sequence as a frequency domain main sequence from the frequency domain main sequence set according to a signaling to be transmitted;
and step 3: loading the frequency domain main body sequence to a frequency domain subcarrier according to the selected frequency domain main body sequence by a preset filling rule to form a frequency domain main body signal of a preamble symbol;
the preamble symbol is formed by cascading a plurality of OFDM symbols in a time domain;
the OFDM symbols are obtained by performing Fourier inversion on frequency domain main signals;
the bandwidth occupied by the frequency domain main body signal corresponding to each OFDM symbol is determined by the type of a transmission network;
a first OFDM symbol in the OFDM symbols carries a bandwidth indication signaling, and the bandwidth indication signaling represents the bandwidth occupied by the preamble symbol;
the bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is controlled by the preset sequence length N of the frequency domain main sequence set, and is characterized by the leading symbol bandwidth signaling carried by the first OFDM symbol, and the preset sequence length N of the frequency domain main sequence set is determined by the type of a transmission network.
2. The method for generating a frequency domain main signal of preamble symbols with variable bandwidth as claimed in claim 1, wherein said step 1 comprises:
step 1.1: generating a constant envelope zero autocorrelation CAZAC sequence set with the sequence length of Ntotl by using different root values to form a frequency domain sequence candidate set A; generating a Gold sequence set with the sequence length of Ntot2 by utilizing a pseudo-random m sequence optimization pair, and forming a frequency domain sequence candidate set B after binary phase shift keying BPSK modulation;
step 1.2: selecting Ntot elements in part or all of the sequences in the frequency domain sequence candidate set A to be correspondingly multiplied with Ntot elements in part or all of the sequences in the frequency domain sequence candidate set B, and forming a frequency domain combined sequence candidate set C with the sequence length of Ntot by using all the sequences obtained after multiplication;
step 1.3: sequencing elements in the frequency domain combined sequence candidate set C according to a preset sequencing rule, and taking part or all of the frequency domain combined sequence candidate set C according to a preset extraction rule to form a frequency domain combined sequence set;
step 1.4: and for each sequence in the frequency domain combined sequence set, continuously taking N elements with a preset length from a preset position m to obtain subsequences, and forming a frequency domain main sequence set with the sequence length of N.
3. The method of claim 2, wherein the step 1.1 of forming the frequency domain sequence candidate set a comprises:
A＝Z
wherein the content of the first and second substances,
z represents a sequence set with a length of Ntot1 formed by constant envelope zero autocorrelation CAZAC sequences with a root value of a;
z (k) denotes the value of the generated CAZAC sequence at index k;
e represents the base of the natural logarithm;
j represents an imaginary unit;
pi represents a circumferential ratio;
k denotes an index of an element in the generated CAZAC sequence;
a represents a root value;
a represents a frequency domain sequence set with the length of Ntotl formed by constant-envelope zero autocorrelation CAZAC sequences with the root value of a.
4. The method of claim 3, wherein the step 1.1 of forming the frequency domain sequence candidate set B comprises:
g1(x)＝x11+x2+1
g2(x)＝x11+x8+x5+x2+1
B1＝[M，T1]
B＝1-2·B1
wherein the content of the first and second substances,
g1(x)、g2(x) A generator polynomial representing a preferred pair of m sequences;
x represents an element;
m represents a preferred pair T using the above M-sequence1And T2Generating an initial set of Gold sequences with the sequence length of Ntot2 by using a shift modulo two addition operation;
m (l, k1) represents the value of the k1 th element in the l-th sequence in the generated initial set of Gold sequences;
T1generator polynomial g representing preferred pairs using m-sequences1(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1);
T2generator polynomial g representing preferred pairs using m-sequences2(x) And the state is [ 00000000001]The m-sequence generated by the shift register of (1);
mod (k1+ l, Ntot2) denotes the remainder for the value of k1+ l divided by Ntot 2;
T1(mod (k1+ l, Ntot2)) represents the sequence T1Value at index mod (k1+ l, Ntot2)
l is the serial number index of the Gold sequence initial set, l is more than or equal to 0 and less than or equal to Ntot2-1, and l is an integer;
k1 denotes the index of the element in each sequence in the generated initial set of Gold sequences, k1 is a positive integer;
B1representing the initial set M of Gold sequences and the M-sequence T1Merging to form a frequency domain sequence initial candidate set B with the sequence length of Ntot2 and the sequence number of Ntot2+11；
B denotes an initial candidate set B of frequency domain sequences1The 0/1 sequences in (1) are converted into bipolar sequences, and a frequency domain sequence candidate set B is generated.
5. The method for generating a frequency domain main signal of pilot symbols with variable bandwidth as claimed in claim 4, wherein said step 1.2 comprises:
wherein the content of the first and second substances,
Cl1representing the sequence with the sequence number index l1 in the generated frequency domain combined sequence candidate set C;
ANtotrepresenting a sequence consisting of Ntot elements of the sequences in the frequency domain sequence candidate set A;
x represents the one-to-one multiplication of elements in the two-sided sequence of the multiplication sign.
6. The method of claim 2, wherein the predetermined ordering rule comprises:
respectively carrying out periodic autocorrelation operation on each sequence in the frequency domain combined sequence candidate set C, sequencing each sequence in the frequency domain combined sequence candidate set C from large to small according to the peak-to-average power ratio, and carrying out incremental numbering from 0;
the predetermined extraction rule includes:
leading symbols are obtained by combining 0FDM symbols obtained by performing Fourier inversion on frequency domain main signals, namely time domain main signals in a time domain, and the symbol number index of the time domain main signals corresponding to the frequency domain main signals one to one is set to be L, wherein L is a positive integer larger than 0;
when L is 1, when the L-th time domain main signal is generated, 2 sequences numbered 0 and 1 in the frequency domain combined sequence candidate set C are taken to form a frequency domain combined sequence set;
when L is more than 1, when the subsequent L-th time domain main body signal is generated, 256 sequences from 2+256 (L-2) to 1+256 (L-1) in the frequency domain combination sequence candidate set are selected to form a frequency domain combination sequence set;
the predetermined sequence selection rule comprises:
step 2.1: converting the signaling to be transmitted into a decimal representation form;
step 2.2: and corresponding the decimal signaling information to elements in the frequency domain main sequence set according to the equivalent value of the number to obtain the frequency domain main sequences corresponding to the signaling information one by one.
7. The method of claim 6, wherein the step 2.1 comprises:
when the original signaling information is represented in a binary form, gray coding is carried out on the signaling information to obtain coded binary signaling information, and then the coded binary signaling information is converted into a decimal form to be represented;
when the original signaling information is represented in a non-binary manner, the original signaling information is firstly converted into a binary form to be represented, then the converted binary signaling information is gray coded to obtain coded signaling information, and then the coded signaling information is converted into a decimal form to be represented.
8. The method of claim 7, wherein the predetermined padding rule comprises:
the preset sequence length N of the main sequence set is not more than the Fourier transform length Nfft of the main signal in the frequency domain, and the main sequence in the frequency domain is mapped into a positive frequency subcarrier and a negative frequency subcarrier by referring to the preset sequence length N;
and filling a preset number of virtual subcarriers and direct current subcarriers at the outer edges of the positive frequency subcarriers and the negative frequency subcarriers according to the Fourier transform length Nfft to generate a frequency domain main body signal.
9. The method of claim 8, wherein the expression for generating the frequency domain main signal is as follows:
wherein the content of the first and second substances,
l represents a symbol number index value of the time domain body signal corresponding one-to-one to the frequency domain body signal;
tau is a decimal representation form of the signaling to be transmitted;
k2 denotes a subcarrier index value;
ntot represents the length of each sequence in the frequency domain combined sequence candidate set C;
n represents a predetermined sequence length N of the set of frequency domain subject sequences;
a predetermined sequence length N representing a set of frequency domain subject sequences divided by 2;
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