CN106341362B - Pilot frequency sending method, pilot frequency receiving method and device thereof - Google Patents

Pilot frequency sending method, pilot frequency receiving method and device thereof Download PDF

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CN106341362B
CN106341362B CN201510400884.4A CN201510400884A CN106341362B CN 106341362 B CN106341362 B CN 106341362B CN 201510400884 A CN201510400884 A CN 201510400884A CN 106341362 B CN106341362 B CN 106341362B
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pilot
value
frequency
data
pilot frequency
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CN106341362A (en
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胡苏�
袁航
喻斌
孙鹏飞
朱大琳
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

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Abstract

The application discloses a pilot frequency sending method, which is applied to an MIMO-FBMC system and comprises the following steps: executing A to C for each transmitting antenna respectively: A. generating a time domain orthogonal sequence used as a pilot, and extending the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system; B. transforming the spread time domain orthogonal sequence into a frequency domain sequence; C. and accumulating the values at the odd positions of the frequency domain sequence to the corresponding positions of the pilot frequency region for transmission. The application also provides a corresponding pilot frequency receiving method, a pilot frequency sending device and a pilot frequency receiving device. By applying the technical scheme disclosed by the application, the accuracy of channel estimation of the MIMO-FBMC system can be improved, and the time-frequency resource of the MIMO-FBMC system is saved.

Description

Pilot frequency sending method, pilot frequency receiving method and device thereof
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a pilot transmitting method, a pilot receiving method, and a pilot receiving apparatus for a filter bank based multi-carrier system.
Background
Among the existing communication technologies, a filter bank multi-carrier (FBMC) system becomes one of the main candidate technologies for future mobile multimedia communication due to its high spectrum utilization and good time-frequency focusing characteristics. A detailed description thereof can be found in (Le Floch, M.Alard, and C.Berrou, "Coded Orthogonal Frequency Division Multiplex," Proceedings of the IEEE, vol.83, pp.982-996, June 1995.).
The mathematical expression of the transmission signal s (t) of the FBMC system is:
Figure GDA0002779875110000011
wherein: a ism,nData on the m-th sub-carrier representing the n-th transmitted symbol, v0And τ0Respectively, the sub-carrier spacing and the transmission signal time spacing of the FBMC system, and g (t) the shaping filter function.
Compared with the conventional orthogonal frequency division multiplexing technology, the FBMC system only satisfies strict orthogonality conditions in the real number domain, as follows:
Figure GDA0002779875110000012
assuming that the FBMC signal experiences a multipath fading channel, the impulse response of the channel is h (t), and the gaussian white noise is n (t), the mathematical expression of the received signal of the FBMC system is:
Figure GDA0002779875110000013
when the receiving end receives the transmitted signal after passing through the multipath fading channel, and performs the matched filtering operation on the transmitted signal, the received signal y (t) is represented as:
Figure GDA0002779875110000021
wherein
Figure GDA0002779875110000022
While
Figure GDA0002779875110000023
Representing all inter-symbol interference and sub-carrier interference.
When a ism,nIs the data of the mth sub-carrier of the pilot sequence (known sequence designed specifically for estimating pilot), then the mathematical expression of the FBMC system for channel estimation based on the pilot sequence is:
Figure GDA0002779875110000024
MIMO (Multi-input Multi-output) technology is also becoming the focus of research, wherein a MIMO system based on VBLAST (Vertical Bell Labs layered Space-Time ) technology effectively improves the system capacity based on MIMO technology by using the combination of multiple transmitting antennas and multiple receiving antennas, as detailed in "V-BLAST: an architecture for reusing high data rates over the rich-addressing wireless channel", authors Wolniansky, P.W, fosschini, G.J, Golden, g.d, valencelela, R.A, published in 1998URSI International Symposium Systems, and Electronics. At present, a MIMO-FBMC system which combines a MIMO system based on VBLAST technology and an FBMC technology becomes a main framework of a more valuable future wireless communication system.
Fig. 1 is a transmitting end structure and a signal processing procedure of a MIMO-FBMC system based on VBLAST structure, including the steps of:
the method comprises the following steps: the serial data stream is input to a bit modulation module, and is modulated according to system parameters, such as a Quadrature Amplitude Modulation (QAM) scheme.
Step two: the modulated data stream is passed through a serial-to-parallel conversion process and then the input serial data is mapped to a different transmit data stream according to the transmitter structure of VBLAST.
Step three: and respectively adding a pilot sequence to the head of the data block modulated by each data stream, wherein the pilot sequence is used for channel estimation of the MIMO-FBMC system.
Step four: and (3) carrying out orthogonalization phase mapping on the data added with the pilot frequency sequence according to the formula (1).
Step five: and the IFFT transformation is completed on the data after the step four through an IFFT module.
Step six: and D, finishing the forming filtering process of the data passing the step five through a forming filter bank module.
Step seven: and mapping the different data streams after the step six to different sending antennas, and then transmitting.
Fig. 2 is a receiving end structure and a signal processing procedure of the MIMO-FBMC system, including the following steps:
the method comprises the following steps: firstly, the demodulation of different data streams is completed according to the demodulation process of the FBMC system, and the orthogonal phase information is removed.
Step two: and C, respectively carrying out channel estimation on the receiving signals of different receiving antennas by using the channel information obtained in the first step, so as to obtain the channel response between the transmitting antenna and the receiving antenna, and then eliminating the influence of multipath interference on the FBMC system by using an equalizer.
Step three: and inputting the data after the second step into a conventional interference suppression and detection module of the VBLAST system, and outputting the data after the interference elimination.
Step four: and D, carrying out QAM demodulation on the data passing through the step three in different data streams, and finally outputting the demodulated data bit information.
For an orthogonal frequency division multiplexing system based on a complex domain space, CP-OFDM (orthogonal frequency division multiplexing system with Prefix added, OFDM with Cyclic Prefix) eliminates inter-symbol interference by adding Prefix, so that a channel estimation method based on a hidden sequence of a conventional MIMO-OFDM system can obtain channel information between antennas by directly superimposing mutually orthogonal sequences (such as ZCZ sequences) as pilot frequencies and performing correlation operation with local sequences at a receiving end. However, for the MIMO-FBMC system under the real-number domain orthogonal condition, the complex characteristics of the multipath fading channel will destroy the orthogonal characteristics of the FBMC system, so the signals received by the receiving front end have inter-symbol interference and inter-subcarrier interference, and it is necessary to design a pilot signal sequence and a channel estimation method for the MIMO-FBMC real-number domain orthogonal characteristics to eliminate the inter-symbol interference and the inter-subcarrier interference.
Disclosure of Invention
The application provides a pilot frequency sending method, a pilot frequency receiving method and a device thereof, which are used for improving the accuracy of channel estimation of an MIMO-FBMC system and saving time-frequency resources of the MIMO-FBMC system.
The application discloses a pilot frequency sending method, which is applied to a filter bank multi-carrier FBMC system and comprises the following steps:
executing A to C for each transmitting antenna respectively:
A. generating a time domain orthogonal sequence used as a pilot, and extending the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system;
B. transforming the spread time domain orthogonal sequence into a frequency domain sequence;
C. and accumulating the values at the odd positions of the frequency domain sequence to the corresponding positions of the pilot frequency region for transmission.
Preferably, the pilot frequency region is a region where filter interference is zero.
Preferably, the two sides of the pilot frequency region are respectively auxiliary pilot frequency and data.
Preferably, the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
Preferably, C includes: and accumulating the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for transmission.
The present application further provides a pilot sending apparatus, which is applied to an FBMC system, and includes:
a first module of a transmitting end, which generates a time domain orthogonal sequence used as a pilot frequency and extends the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system;
the second module of the sending end transforms the time domain orthogonal sequence after the expansion into a frequency domain sequence;
and the third module of the sending end accumulates the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for sending.
The present application further provides a pilot receiving method, configured to process a pilot sent by the pilot sending method according to claim 1, including:
the following operations are performed for each receive antenna:
a1, extracting data corresponding to a pilot frequency area of a transmitting terminal from a received signal;
b1, obtaining a receiving value of a frequency domain according to the data;
c1, transforming the receiving value of the frequency domain to a time domain to obtain a receiving value of the time domain;
d1, calculating a time domain channel tap response estimation;
and E1, transforming the time domain channel tap response to the frequency domain to obtain the channel estimation response of the frequency domain.
Preferably, the pilot frequency region is a region where filter interference is zero.
Preferably, the B1 includes: and carrying out zero filling operation on the data at even positions to obtain a receiving value of a frequency domain.
Preferably, the two sides of the pilot frequency region are respectively auxiliary pilot frequency and data.
Preferably, the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
Preferably, the a1 includes: data at odd-numbered positions in the pilot region is extracted from the received signal.
The present application further provides a pilot receiving apparatus, which is applied to an FBMC system, and includes:
a first module of a receiving end, which extracts data corresponding to a pilot frequency area of a transmitting end from a received signal;
the second module of the receiving end obtains the receiving value of the frequency domain according to the data;
the third module of the receiving end, change the receiving value of the said frequency domain into the time domain, receive the value of the time domain;
the fourth module of the receiving end, calculate the channel tap response estimation of the time domain;
and the fifth module of the receiving end converts the time domain channel tap response to the frequency domain to obtain the channel estimation response of the frequency domain.
According to the technical scheme, the sequence structure suitable for MIMO-FBMC system channel estimation, and the corresponding pilot frequency sending method, the pilot frequency receiving method and the device are provided by combining the real number domain orthogonal characteristic of the MIMO-FBMC system. The pilots of the structure include a list of regular pilots and a list of auxiliary pilots. Where the regular pilots are used for channel information estimation and the auxiliary pilots are used to construct a region where the filter interference is zero.
Firstly, for each transmitting antenna, selecting one sequence in an orthogonal sequence set to obtain a required time domain sequence through the construction mode of the application; transforming the time domain sequence to the frequency domain by fourier transform; and then the frequency domain sequence is added to the pilot frequency region with zero interference to be used as a conventional pilot frequency for transmission. Because the sequence has orthogonality in the time domain, interference of pilot symbols of different antennas can be eliminated at a receiving end in the FBMC system through correlation operation, and therefore channel tap response is estimated. The channel estimation method provided by the application has the characteristic of pure real numbers in the frequency domain due to the special structure of the sequence, so that only two rows of real number resources are used as pilot frequencies, and the number of the pilot frequencies cannot be increased along with the increase of the number of the antennas, thereby saving the time-frequency resources of the MIMO-FBMC system.
Drawings
FIG. 1 is a diagram of a transmitting end structure of a MIMO-FBMC system;
FIG. 2 is a diagram of a receiving end structure of the MIMO-FBMC system;
FIG. 3(a) is a diagram illustrating a first preferred MIMO-FBMC pilot sequence structure according to the present application;
FIG. 3(b) is a diagram illustrating a second preferred MIMO-FBMC pilot sequence structure according to the present application;
fig. 4 is a diagram of a transmitting end structure of the MIMO-FBMC channel estimation process according to the present application;
fig. 5 is a receiving end structure diagram of the MIMO-FBMC channel estimation process of the present application;
FIG. 6 is a diagram of an orthogonal sequence used in an embodiment of the present application;
fig. 7 is a schematic diagram of spreading the orthogonal sequence of fig. 6 into a pilot time domain sequence according to an embodiment of the present application;
fig. 8 is a schematic diagram illustrating a result of transforming the time domain sequence of fig. 7 to the frequency domain after passing through an FFT module in an embodiment of the present application;
FIG. 9 is a diagram of a final transmitted pilot according to an embodiment of the present invention;
FIG. 10 is a diagram of an orthogonal sequence used in example two of the present application;
fig. 11 is a schematic diagram of spreading the orthogonal sequence of fig. 10 into a pilot time domain sequence according to a second embodiment of the present application;
fig. 12 is a schematic diagram illustrating a result of transforming the time domain sequence of fig. 11 to the frequency domain after passing through an FFT module in an embodiment of the present application;
fig. 13 is a schematic diagram of a final transmission pilot according to a second embodiment of the present application;
fig. 14 is a block diagram of a preferred pilot transmitting apparatus according to the present application;
fig. 15 is a block diagram of a preferred pilot receiver according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
Fig. 3(a) and fig. 3(b) respectively show the pilot structure of two preferred MIMO-FBMC systems of the present invention, the whole pilot part includes two columns: one is a Conventional pilot (conditional Preamble), the other is an Auxiliary pilot (Auxiliary Preamble), and a row of time-frequency resources where the Conventional pilot is located is also referred to as a pilot Zone (Preamble Zone) in the present application. The neighboring sides of the conventional pilot are a column of auxiliary pilots and a column of Data called Reference Data (Reference Data), respectively, wherein the values of the auxiliary pilots are determined by the values of the Reference Data. The pilot structure of fig. 3(a) has the auxiliary pilot located on the right side of the normal pilot and the reference data located on the left side of the normal pilot. The pilot structure of fig. 3(b) has the auxiliary pilot on the left side of the normal pilot and the reference data on the right side of the normal pilot.
The values of the positions in the two pilot structures are as follows:
the method comprises the following steps: the value of the odd position of the auxiliary pilot is equal to the value of the odd position corresponding to the reference data.
Step two: the values of the even positions of the secondary pilots are equal to the inverse of the values of the reference data corresponding to the even positions.
Step three: the even positions of the regular pilots have a value of zero.
For a sequence of length L (L is an even number) c ═ c (0), c (1),.., c (L-1)]TThe term "value at odd position" as used herein refers to the value at these positions c (0), c (2),.. c (L-2); "value of even position" refers to the value of these positions c (1), c (3). Because the filter interference cancels each other at odd-numbered positions of the pilot region according to the symmetry of the filter interference, the filter interference at odd-numbered positions of the pilot region is zero for the pilot structure shown in fig. 3(a) and 3(b), and the pilot region is referred to as a "region where the filter interference is zero" in the present application.
The technical scheme provided by the application is suitable for all FBMC systems, and particularly can obtain better beneficial effects on the MIMO-FBMC system. In the following description, the MMO-FBMC system will be mainly taken as an example. In addition, the present application needs to use orthogonal sequences to construct a time domain sequence set of a time domain, where correlation between the orthogonal sequences is zero or close to zero, and a ZCZ sequence is taken as an example in the following description. Also, suppose the MIMO-FBMC system is a MIMO system having t transmit antennas and r receive antennas, the subcarrier size is M, the number of channel taps is LhThe ZCZ sequence c used by the q-th (1, 2.. t) transmitting antennaq＝[cq(0),cq(1),...,cq(P-1)]TThe length of the zero correlation zone is equal to or more than L, and the length of the zero correlation zone is equal to or more than L, wherein the length of the zero correlation zone is equal to or more than 1/4M, the size of the ZCZ sequence set is N (N is more than or equal to t), and the size of the zero correlation zone is more than or equal toh-1。
Fig. 4 is a transmitting-end signal processing procedure (i.e., a pilot transmission method) of the channel estimation method of the present invention, which mainly improves the FBMC modulation scheme part compared with the procedure shown in fig. 1, and mainly includes the following steps:
for each transmit antenna q (q ═ 1, 2.., t), steps one to three are performed:
the method comprises the following steps: selecting a ZCZ sequence c from the residual ZCZ sequences in the ZCZ sequence setqThe sequence is extended according to formula (6) to a time domain sequence s of length M used as a pilot, with the length P-1/4Mq＝[sq(0),sq(1),...,sq(M-1)]T：
Figure GDA0002779875110000071
Here, the ZCZ sequence set may be predefined and includes several time-domain ZCZ sequences of length P1/4M, where the ZCZ sequences are orthogonal to each other and satisfy that the size of the zero correlation region is not less than the number of channel taps, i.e., Z ≧ Lh-1. The transmitting end can select a ZCZ sequence from the ZCZ sequence set as a pilot frequency for each antenna according to predefined or system scheduling authorization signaling.
Step two: for the sequence sqPerforming Fast Fourier Transform (FFT) of M points to obtain a frequency domain sequence S with the length of Mq＝[Sq(0),Sq(1),...,Sq(M-1)]TThe process can be represented by equation (7). At this time by the sequence sqAnd the nature of the Fourier transform, SqIs a purely real sequence and has an even position of zero. The Fourier Transform (FT) is a general term of a conversion method of converting a time domain signal into a frequency domain signal, and when the signal is a discrete signal, it is generally converted into a frequency domain signal by a Discrete Fourier Transform (DFT) or a Fast Fourier Transform (FFT). The present application takes FFT as an example for explanation.
Figure GDA0002779875110000081
Step three: will sequence SqIs odd number ofThe values at the positions are accumulated to the corresponding positions of the pilot frequency area to obtain a sending pilot frequency T ═ T (0), T (1),.. T, T (M-1)]T. This process can be expressed by equation (8):
Figure GDA0002779875110000082
and after the first step to the third step are carried out on all the transmitting antennas, the transmitting pilot frequency is obtained.
Step four: and respectively adding a transmission pilot frequency to the head of each data stream after modulation, wherein the transmission pilot frequency is used for channel estimation of the MIMO-FBMC system.
Step five: and after the data added with the pilot frequency is subjected to orthogonalization phase mapping and inverse Fourier transform and is subjected to filtering operation through a shaping filter, each data stream is respectively mapped to a corresponding transmitting antenna for transmission.
Fig. 5 shows a receiving end signal processing procedure (i.e., a pilot receiving method) of the channel estimation method of the present application, in which different antennas at the receiving end of the MIMO-FBMC system output received signals respectively to form different data streams, and the different data streams are processed according to the processing method of the FBMC system; the method specifically comprises the following steps: firstly, signals are received and processed into digital signals, then the digital signals are filtered through a matched filter, Fourier transform, synchronous receiving and the like are carried out. Compared with the process shown in fig. 2, the receiving end processing process mainly improves the channel estimation and equalization part, and comprises the following steps:
the method comprises the following steps: taking the p (p ═ 1, 2.., R) th receiving antenna as an example, data corresponding to the regular pilot region position of the transmitting antenna is extracted to obtain Rp＝[Rp(0),Rp(1),...,Rp(M-1)]T. Because the specific position of the signal in the time frequency domain dimension is known by both the transmitting end and the receiving end of the MIMO-FBMC system, the data of the corresponding position can be directly extracted at the receiving end. At this time, the value of the odd position of the received signal is taken out to obtain the sequence Yp＝[Yp(0),Yp(1),...,Yp(M-1)]TThe process is represented by the following formula(9) Expressed as:
Figure GDA0002779875110000091
step two: will sequence YpPerforming inverse Fourier transform to the time domain through M points to obtain a receiving value y of the time domainp＝[yp(0),yp(1),...,yp(M-1)]TThe process can be expressed by the following equation (10):
Figure GDA0002779875110000092
step three: constructing a demodulation matrix DqComprises the following steps:
Figure GDA0002779875110000093
step four: the final channel tap response estimate is:
Figure GDA0002779875110000094
wherein h isp,q＝[hp,q(0),…,hp,q(1),hp,q(Lh-1)]T。
Step five: the time domain channel tap response is transformed to the frequency domain through M-point FFT to obtain the channel estimation response H of the frequency domainp,q＝[Hp,q(0),…,Hp,q(1),Hp,q(Lh-1)]T. The receiver first utilizes Hp,qAnd equalizing the received signal so as to compensate the influence of a multipath channel on the transmitted signal, and then finishing the information symbol-level demodulation of each data stream according to the FBMC system demodulation process.
Step six: and inputting the data after the fifth step into an interference cancellation and detection module in the receiving structure of the traditional VBLAST, thereby eliminating the interference among the multiple antennae and outputting the effective data after the interference suppression.
Step seven: inputting the data after the sixth step into a QAM demodulation module, and then completing the output of effective bit information through parallel-serial conversion.
The technical solution of the present application is illustrated by two specific examples.
The first embodiment is as follows:
in this embodiment, it is assumed that the MIMO-FBMC system is a MIMO system having 2 transmitting antennas and 2 receiving antennas, and adopts 4QAM modulation, where the subcarrier size is M equal to 32, and the number of channel taps is LhTo achieve that the pilot sequence energy is the same as the data energy, 2 normalized ZCZ sequences with length P-8 are used:
Figure GDA0002779875110000101
Figure GDA0002779875110000102
the pilot structure has the structure of fig. 3(a), and the MIMO-FBMC system constructs a transmission pilot in the manner of fig. 6 to 9.
Fig. 6 shows orthogonal sequences used by the transmission antenna 1 and the transmission antenna 2 in the present embodiment. Firstly, constructing a pilot frequency time domain sequence shown in fig. 7 by the orthogonal sequence in fig. 6 according to a method of formula (6); performing FFT on the sequence in the figure 7 according to a formula (7) to obtain a frequency domain real number sequence shown in figure 8; then, the sequence in fig. 8 is used as a conventional pilot frequency and placed in the pilot frequency region, and the value of the corresponding position of the auxiliary pilot frequency is set according to the value of the reference data, and finally the transmission pilot frequency in fig. 9 is obtained.
In the processing at the receiving end, the received value at the pilot region position is extracted according to the structure of fig. 5, and the subsequent processing is performed according to equations (9) to (11).
Example two:
the present embodiment assumes that the MIMO-FBMC system is a MIMO system having 2 transmit antennas and 2 receive antennas, adopts 16QAM modulation,the size of subcarrier is M-32, and the number of channel taps is LhTo achieve that the pilot sequence energy is the same as the data energy, 2 normalized ZCZ sequences with length P-8 are used:
Figure GDA0002779875110000103
Figure GDA0002779875110000104
the pilot structure has the structure of fig. 3(b), and the MIMO-FBMC system constructs a transmission pilot in the manner of fig. 10 to 13.
Fig. 10 shows orthogonal sequences used by the transmission antenna 1 and the transmission antenna 2 in the present embodiment. Firstly, constructing a pilot time domain sequence shown in fig. 11 by the orthogonal sequence in fig. 10 according to a method of formula (6); performing FFT on the sequence in FIG. 11 according to a formula (8) to obtain a frequency domain real number sequence shown in FIG. 12; then, the sequence in fig. 12 is used as a conventional pilot and placed in the pilot region, and the value of the corresponding position of the auxiliary pilot is set according to the value of the reference data, so as to finally obtain the transmission pilot in fig. 13.
In the processing at the receiving end, the received value at the pilot region position is extracted according to the structure of fig. 5, and the subsequent processing is performed according to equations (9) to (11).
Corresponding to the pilot frequency transmission method of the present application, the present application further provides a pilot frequency transmission apparatus, which is applied to an FBMC system, and a module schematic diagram of the apparatus is as shown in fig. 14, where the apparatus includes:
a first module of a transmitting end, which generates a time domain orthogonal sequence used as a pilot frequency and extends the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system;
the second module of the sending end transforms the time domain orthogonal sequence after the expansion into a frequency domain sequence;
and the third module of the sending end accumulates the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for sending.
Corresponding to the pilot receiving method of the present application, the present application further provides a pilot receiving apparatus, applied to an FBMC system, where a module schematic diagram of the apparatus is as shown in fig. 15, and the apparatus includes:
a first module of a receiving end, which extracts data corresponding to a pilot frequency area of a transmitting end from a received signal;
the second module of the receiving end obtains the receiving value of the frequency domain according to the data;
the third module of the receiving end, change the receiving value of the said frequency domain into the time domain, receive the value of the time domain;
the fourth module of the receiving end, calculate the channel tap response estimation of the time domain;
and the fifth module of the receiving end converts the time domain channel tap response to the frequency domain to obtain the channel estimation response of the frequency domain.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (22)

1. A pilot frequency sending method is applied to a filter bank multi-carrier FBMC system and is characterized by comprising the following steps:
executing A to C for each transmitting antenna respectively:
A. generating a time domain orthogonal sequence used as a pilot, and extending the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system;
B. transforming the spread time domain orthogonal sequence into a frequency domain sequence;
C. and accumulating the values at the odd positions of the frequency domain sequence to the corresponding positions of the pilot frequency region for transmission.
2. The method of claim 1, wherein:
the pilot frequency area is an area with zero filter interference.
3. The method according to claim 1 or 2, characterized in that:
and auxiliary pilot frequency and data are respectively arranged at two sides of the pilot frequency area.
4. The method of claim 3, wherein:
the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
5. The method of claim 4, wherein:
the C comprises: and accumulating the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for transmission.
6. A pilot transmitting apparatus applied to an FBMC system, comprising:
a first module of a transmitting end, which generates a time domain orthogonal sequence used as a pilot frequency and extends the length of the time domain orthogonal sequence to be equal to the length of a subcarrier of the FBMC system;
the second module of the sending end transforms the time domain orthogonal sequence after the expansion into a frequency domain sequence;
and the third module of the sending end accumulates the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for sending.
7. The apparatus of claim 6, wherein:
the pilot frequency area is an area with zero filter interference.
8. The apparatus of claim 6 or 7, wherein:
and auxiliary pilot frequency and data are respectively arranged at two sides of the pilot frequency area.
9. The apparatus of claim 8, wherein:
the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
10. The apparatus of claim 9, wherein:
and the third module of the sending end is used for accumulating the values at the odd positions of the frequency domain sequence to the odd positions of the pilot region for sending.
11. A pilot receiving method, for processing the pilot transmitted by the pilot transmission method of claim 1, comprising:
the following operations are performed for each receive antenna:
a1, extracting data corresponding to a pilot frequency area of a transmitting terminal from a received signal;
b1, obtaining a receiving value of a frequency domain according to the data;
c1, transforming the receiving value of the frequency domain to a time domain to obtain a receiving value of the time domain;
d1, calculating a time domain channel tap response estimation;
and E1, transforming the time domain channel tap response to the frequency domain to obtain the channel estimation response of the frequency domain.
12. The method of claim 11, wherein:
the pilot frequency area is an area with zero filter interference.
13. The method according to claim 11 or 12, characterized in that:
the B1 includes: and carrying out zero filling operation on the data at even positions to obtain a receiving value of a frequency domain.
14. The method of claim 13, wherein:
and auxiliary pilot frequency and data are respectively arranged at two sides of the pilot frequency area.
15. The method of claim 14, wherein:
the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
16. The method of claim 15, wherein:
the A1 includes: data at odd-numbered positions in the pilot region is extracted from the received signal.
17. A pilot receiving apparatus, applied to an FBMC system for processing pilots transmitted by the pilot transmission method of claim 1, comprising:
a first module of a receiving end, which extracts data corresponding to a pilot frequency area of a transmitting end from a received signal;
the second module of the receiving end obtains the receiving value of the frequency domain according to the data;
the third module of the receiving end, change the receiving value of the said frequency domain into the time domain, receive the value of the time domain;
the fourth module of the receiving end, calculate the channel tap response estimation of the time domain;
and the fifth module of the receiving end converts the time domain channel tap response to the frequency domain to obtain the channel estimation response of the frequency domain.
18. The apparatus of claim 17, wherein:
the pilot frequency area is an area with zero filter interference.
19. The apparatus of claim 17 or 18, wherein:
the receiving end second module includes: and carrying out zero filling operation on the data at even positions to obtain a receiving value of a frequency domain.
20. The apparatus of claim 19, wherein:
and auxiliary pilot frequency and data are respectively arranged at two sides of the pilot frequency area.
21. The apparatus of claim 20, wherein:
the value of the odd position of the auxiliary pilot frequency is equal to the value of the odd position corresponding to the data, and the value of the even position of the auxiliary pilot frequency is equal to the opposite value of the even position corresponding to the data;
the value of the even position of the pilot region is 0.
22. The apparatus of claim 21, wherein:
the receiving end first module is used for extracting data at odd positions in the pilot region from a received signal.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107395544B (en) * 2017-07-18 2019-10-18 电子科技大学 Real number orthogonal pilot frequency sequence sending method based on MIMO-FBMC
CN109391403B (en) * 2017-08-10 2021-07-06 上海诺基亚贝尔股份有限公司 Method and apparatus for transmission and reception of wireless signals
CN107528803B (en) * 2017-10-13 2020-02-14 兰州理工大学 Channel estimation method of hidden sequence mode suitable for wireless optical communication
WO2019134164A1 (en) * 2018-01-08 2019-07-11 海能达通信股份有限公司 Reliable transmission method and device for broadband private network in high-speed mobile channel
CN109525290B (en) * 2019-01-11 2021-06-08 电子科技大学 Real number feedback iterative channel estimation method based on MIMO-FBMC system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103888406A (en) * 2014-03-28 2014-06-25 华中科技大学 Data transmission method for filter bank multi-carrier system
CN103997477A (en) * 2006-06-16 2014-08-20 夏普株式会社 Base station, base station communication method, mobile platform and mobile platform communication method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1049302B1 (en) * 1999-04-23 2006-06-28 Sony Deutschland GmbH Synchronization preamble in an OFDM system
CN1905546A (en) * 2005-07-25 2007-01-31 上海原动力通信科技有限公司 Method for determining pilot frequency symbol position of TDD OFDM system
CN1984107A (en) * 2005-12-12 2007-06-20 中国科学院上海微系统与信息技术研究所 Leading sequence of multi-carrier system and its use
CN101005475A (en) * 2006-12-14 2007-07-25 华为技术有限公司 Method and system for synchronizing time and frequency in orthogonal frequency division multiplex communication
CN101141143B (en) * 2007-09-04 2011-05-11 中兴通讯股份有限公司 Time-frequency RAKE receiving method and apparatus
CN101527583B (en) * 2009-04-17 2012-11-14 中山大学 WCDMA downlink channel parameter estimation method
FR3013928B1 (en) * 2013-11-28 2015-12-25 Commissariat Energie Atomique CHANNEL ESTIMATION METHOD FOR FBMC TELECOMMUNICATION SYSTEM

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103997477A (en) * 2006-06-16 2014-08-20 夏普株式会社 Base station, base station communication method, mobile platform and mobile platform communication method
CN103888406A (en) * 2014-03-28 2014-06-25 华中科技大学 Data transmission method for filter bank multi-carrier system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Discussion on LTE-based massive connectivity techniques;ZTE;《3GPP TSG RAN Meeting #68》;20150618;全文 *

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