CN106330799A - FBMC system equalization method based on auxiliary data - Google Patents

Abstract

The invention discloses an FBMC system equalization method based on auxiliary data, and provides a channel estimation method suitable for an FBMC system and a sending data structure in combination with a real number field orthogonal condition of the FBMC system, two symbols s1 and s2 of the structure at a certain moment are transmitted by two continuous time slots, the sent data of the structure comprises original data for sending and auxiliary data for counteracting data interference, the original data is randomly released, the auxiliary data is a conjugate or a negative conjugate of the original data, that is (the formula is as shown in the specification) or (the formula is as shown in the specification). Compared with the prior art, the FBMC system equalization method disclosed by the invention is simple and convenient to operate, and meanwhile, the inter-symbol interference and subcarrier interference in receiving data can be eliminated by the system interference properties.

Description

FBMC system equalization method based on assistance data

Technical field

The invention belongs to wireless communication technology field, be specifically related to FBMC system equalization technology.

Background technology

In existing communication technology, filter bank multi-carrier (FBMC) system is with its higher availability of frequency spectrum, good Time-frequency focus characteristics, become one of major candidate of following mobile multimedia communication.It is discussed in detail and 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,Jun.1995.)。

The mathematic(al) representation of transmission signal s (t) of FBMC system is:

$\begin{array}{c}s\left(t\right)=\underset{n}{\Σ}\underset{m=0}{\overset{M-1}{\Σ}}{a}_{m,n}g(t-{\mathrm{n\τ}}_0)j^{m+n}{e}^{j2{\mathrm{\πm\υ}}_{0}t}\\ g_{m,n}=g(t-{\mathrm{n\τ}}_0)j^{m+n}{e}^{j2{\mathrm{\πm\υ}}_{0}t}\end{array}---\left(1\right)$

Wherein, a_m,nRepresent data on the m-th subcarrier of the n-th transmitting symbol, υ₀And τ₀Represent FBMC system subcarrier Interval and transmission signal interval, g (t) is expressed as mode filter function.Compared to traditional orthogonal frequency division multiplexi, FBMC system only meets strict orthogonality condition in real number field, as follows:

Assuming that FBMC signal experienced by a multidiameter fading channel, channel pulse shock response is h (t), white Gaussian noise The mathematic(al) representation receiving signal for n (t), FBMC system is:

$y\left(t\right)=h\left(t\right)*s\left(t\right)+n\left(t\right)={\∫}_0^{\mathrm{\Δ}}h(t,\mathrm{\τ})s(t-\mathrm{\τ})d\mathrm{\τ}+n\left(t\right)---\left(3\right)$

When receiving terminal receives the transmission signal after multidiameter fading channel, after it is carried out matched filtering operation, receive Signal y (t) is expressed as:

$\begin{array}{c}y\left(t\right)\mathrm{Re}(\underset{n}{\&Sigma;}\underset{n^{\&prime;}}{\&Sigma;}\underset{m=0}{\overset{M-1}{\&Sigma;}}\underset{m^{\&prime;}=0}{\overset{M-1}{\&Sigma;}}{a}_{m,n}<g_{m,n}|g_{m^{\&prime;},n^{\&prime;}}>H_m)+n^{\&prime;}\left(t\right)\\ =H_m{a}_{m,n}+\mathrm{Re}(\underset{m^{\&prime;}\&NotEqual;m,n^{\&prime;}\&NotEqual;n}{\&Sigma;}{a}_{m^{\&prime;},n}<g_{m,n}|g_{m^{\&prime;},n^{\&prime;}}>H_m)+n^{\&prime;}\left(t\right)\end{array}---\left(4\right)$

Wherein,AndRepresent all symbols Interference between number and subcarrier interference, the interference of this part has considerable influence to the characteristic of system, is to need in various technical research Problem to be solved.

Summary of the invention

The present invention solves above-mentioned technical problem, it is proposed that a kind of FBMC system equalization method based on assistance data, logical Cross use assistance data to offset the interference of data symbol.

The technical solution used in the present invention is: FBMC system equalization method based on assistance data, including:

S1, transmitting terminal data process；Specifically include following step by step:

S11, according to originally transmitted data produce assistance data；

S12, assistance data to originally transmitted data Yu step S11, carry out quadrature amplitude modulation；

S13, step S12 modulate after data block header add pilot frequency sequence；

S14, the data obtaining step S13 are orthogonalized phase mapping；

S15, the data obtaining step S14 carry out IFFT conversion；

S16, step S15 is obtained data it is filtered processing, and launch；

S2, receiving terminal data process, specifically include following step by step:

S21, the data received are carried out matched filtering process；

S22, the data obtaining step S21 carry out FFT, obtain originally transmitted data and auxiliary sends data；

S23, the originally transmitted data obtaining step S22 and auxiliary send data, do coherent operations and divided by 2；

S24, the data obtaining step S23, extract channel information according to pilot frequency sequence, then according to the channel letter extracted Breath, does equilibrium treatment and eliminates multi-path jamming；

S25, the data obtaining step S24 carry out recovering orthogonalization phase mapping and process；

S26, the data obtaining step S25 carry out QAM demodulation.

Further, assistance data described in step S11 is the conjugation data of originally transmitted data or negative conjugation data.

Further, coherent operations described in step S23, if particularly as follows: the conjugation data that assistance data is initial data, then Do phase reducing；If the negative conjugation data that assistance data is initial data, then do phase add operation.

Beneficial effects of the present invention: the FBMC system equalization method based on assistance data of the present invention, in conjunction with FBMC system Real number field orthogonality condition, it is proposed that a kind of channel estimation methods being applicable to FBMC system, at two symbols sometime s₁And s₂, it is launched at two continuous print time slots, sends data and include the initial data for sending and do for offsetting data The assistance data two parts disturbed, initial data provides at random, and assistance data is the conjugation of initial data, or negative is conjugated, I.e.OrThe present invention is the most easy and simple to handle, utilizes system interference characteristic, it is possible to disappear simultaneously Except receiving intersymbol interference and subcarrier interference in data.

Accompanying drawing explanation

The schematic diagram of the most typical FBMC system that Fig. 1 provides for the present invention.

The schematic diagram of the MIMO-FBMC system that Fig. 2 provides for the present invention.

The antenna structure view based on filter bank multi-carrier system that Fig. 3 provides for the present invention.

The originally transmitted data structure diagram that Fig. 4 provides for the present invention.

The auxiliary that Fig. 5 provides for the present invention sends data one of which structure chart.

The auxiliary that Fig. 6 provides for the present invention sends data another kind structure chart.

The originally transmitted data structure diagram that Fig. 7 provides for the embodiment of the present invention.

The auxiliary that Fig. 8 provides for the embodiment of the present invention sends data structure diagram.

Detailed description of the invention

For ease of skilled artisan understands that the technology contents of the present invention, below in conjunction with the accompanying drawings present invention is entered one Step explaination.

Being illustrated in figure 1 the schematic diagram of the most typical FBMC system, Fig. 2 is the most typical MIMO-FBMC system Schematic diagram, the present invention increases assistance data generation module by the QAM modulation module money at transmitting terminal, and at receiving terminal Plus coherent operations module between FFT module and balance module, it is achieved offsetting the purpose of interference, the application invents offer substantially Antenna assumption diagram based on filter bank multi-carrier system as shown in Figure 3: including: transmitting terminal and receiving terminal；

The transmitting terminal of described every transmission antenna includes: assistance data generation module, QAM modulation module, pilot frequency sequence add Add module, orthogonalization phase mapping module, IFFT conversion module, filtration module and transmitter unit；Described assistance data produces Module is for according to originally transmitted data genaration assistance data, and described QAM modulation module is for originally transmitted data and auxiliary Data carry out quadrature amplitude modulation, and described pilot frequency sequence adds module for the data block head after QAM modulation module is modulated Portion adds pilot frequency sequence, and described orthogonalization phase mapping module is orthogonalized phase for the data that pilot tone is added module output Position maps, and described IFFT conversion module is for carrying out IFFT conversion, described filter to the data of orthogonalization phase mapping module output Mode block for being filtered processing to the data of IFFT conversion module output, defeated for by filtration module of described transmitter unit Go out data to launch；

The receiving terminal of described every reception antenna includes: receive unit, matched filtering module, FFT module, relevant behaviour Make module, balance module, remove orthogonalization phase mapping module and QAM demodulation module；Described reception unit for receive from The data of transmitting terminal；Described matched filtering module is for carrying out matched filtering process to the data received；Described FFT mould Block, for the data after matched filtering are carried out FFT process, obtains originally transmitted data and auxiliary sends data；Described phase Dry run module, for the originally transmitted data obtained and auxiliary are sent data, does coherent operations and divided by 2；Described equilibrium model Block, for according to channel information, does equilibrium treatment and eliminates multi-path jamming；Described go orthogonalization phase mapping module for equilibrium The data of module output carry out recovering orthogonalization phase mapping and process；Described QAM demodulation module is for going orthogonalization phase place to reflect The data penetrating module output carry out QAM demodulation.

If the coherent operations described in coherent operations module is particularly as follows: conjugation data that assistance data is initial data, then Do phase reducing；If the negative conjugation data that assistance data is initial data, then do phase add operation.

The present invention also provides for a kind of FBMC system equalization method based on assistance data, including:

S1, transmitting terminal data process；Specifically include following step by step:

S11, according to originally transmitted data produce assistance data；One transmission data resource is divided into two parts, first part Sending initial data, second part of resource, for pretreatment, is set to the conjugation data of first part of number of resource blocks evidence, for producing and The data that in data block 1, absolute value same-sign is contrary；

S12, assistance data to originally transmitted data Yu step S11, carry out quadrature amplitude modulation；

S13, step S12 modulate after data block header add pilot frequency sequence；

S14, the data obtaining step S13 are orthogonalized phase mapping；

S15, the data obtaining step S14 carry out IFFT conversion；

S16, step S15 is obtained data it is filtered processing, and launch；

S2, receiving terminal data process, specifically include following step by step:

S21, the data received are carried out matched filtering process；

S22, the data obtaining step S21 carry out FFT, obtain originally transmitted data and auxiliary sends data；

S23, the originally transmitted data obtaining step S22 and auxiliary send data, do coherent operations and divided by 2；

S24, the data obtaining step S23, extract channel information according to pilot frequency sequence, then according to the channel letter extracted Breath, does equilibrium treatment and eliminates multi-path jamming；Equalization operation is done, if being because first doing after receiving terminal first carries out plus-minus operation Equalization operation, is devious owing to channel is estimated in actual communication system, the most first does equilibrium and can increase dry Disturb.And first carry out plus-minus operation because in this communication environment, the channel between originally transmitted data and assistance data be Number it is believed that approximately the same, the most just eliminates the interference that channel estimation bias is brought.

S25, the data obtaining step S24 carry out recovering orthogonalization phase mapping and process；

S26, the data obtaining step S25 carry out QAM demodulation.

Above-mentioned interpolation pilot frequency sequence, orthogonalization phase mapping, IFFT conversion, Filtering Processing, matched filtering process, FFT become Change, QAM modulation demodulates the conventional treatment technology being communication technical field, does not do too much explanation at this.

The application uses assistance data to offset the principle disturbed as follows:

The present embodiment negative conjugation data instance with assistance data as initial data illustrates, and random citing is used as original Send data as it is shown in fig. 7, the assistance data that produces according to originally transmitted data of transmitting terminal as shown in Figure 8, described Fig. 7,8 be Data structure is described, the size of wherein time and frequency be there is no and do concrete plan.Ambiguity function is a kind of very important When signal is carried out-function of specificity analysis frequently.

First ambiguity in definition function A_g(τ, υ) is:

Wherein, υ and τ represents FBMC system subcarrier interval respectively and sends the variable of signal interval, and g (*) represents Forming filter function, g^*(*) conjugation of g (*) is represented.

If (m, n) the transmission signal at place is a to FBMC system transmitting terminal time-frequency lattice site_m,n, then corresponding to receiving terminal time-frequency The transmission signal received on lattice point (m ', n ') position can be expressed as:

${\hat{a}}_{m,n}=a_{m,n}+\underset{m\&NotEqual;m^{\&prime;},n\&NotEqual;n^{\&prime;}}{\&Sigma;}{a}_{m^{\&prime;},n^{\&prime;}}<g_{m,n}|g_{m^{\&prime;},n^{\&prime;}}>---\left(6\right)$

Formula (6) can be expressed as with ambiguity function:

${\hat{a}}_{m,n}=\underset{p,q}{\&Sigma;}{a}_{k+p,l+q}{j}^{p+q+p(q+2n)}{A}_g^{*}({\mathrm{q\&tau;}}_0,{\mathrm{p\&upsi;}}_0)---\left(7\right)$

Definition time-frequency coordinate is that (m, lattice point neighborhood n) is Ω_Δm,Δn=(p, q), | p |≤Δ m, | q |≤Δ n}, and There are (p, q) ≠ (0,0).Due to the time-frequency focusing of wave filter, wave filter interference mostlys come from (m-1, m+1), (n-4, n+4) These data symbols, therefore formula (7) can be further simplified as (part is omitted):

$\begin{array}{c}{\hat{a}}_{m,n}^1\&ap;\mathrm{...}+a_{m,n}{A}_g^{*}(0,0)+a_{m-1,n-1}{j}^{-2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)+a_{m-1,n}{j}^{-2n-1}{A}_g^{*}(0,-{\mathrm{\&upsi;}}_0)\\ +a_{m-1,n+1}{j}^{-2n-1}{A}_g^{*}({\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)+a_{m,n-1}{j}^{-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,0)+a_{m,n+1}{\mathrm{jA}}_g^{*}({\mathrm{\&tau;}}_0,0)\\ +a_{m+1,n-1}{j}^{2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)+a_{m+1,n}{j}^{2n+1}{A}_g^{*}(0,{\mathrm{\&upsi;}}_0)+a_{m+1,n+1}{j}^{2n+3}{A}_g^{*}({\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)+\mathrm{...}\end{array}---\left(8\right)$

For be positioned at time-frequency lattice (m, transmission symbol n), recycling ambiguity function character:

$A_g(0,0)=1,A_g(\&PlusMinus;\mathrm{\&tau;},\&PlusMinus;\mathrm{\&upsi;})=A_g(\mathrm{\&tau;},\mathrm{\&upsi;})=A_g^{*}(\mathrm{\&tau;},\mathrm{\&upsi;})---\left(9\right)$

Make initial data receive data beThen according to the reception data in Fig. 4 assistance data formula (8)For:

$\begin{array}{c}{\hat{a}}_{m,n}^2\&ap;\mathrm{...}+a_{m,n}{A}_g^{*}(0,0)+a_{m-1,n-1}{j}^{-2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)-a_{m-1,n}{j}^{-2n-1}{A}_g^{*}(0,-{\mathrm{\&upsi;}}_0)\\ +a_{m-1,n+1}{j}^{-2n-1}{A}_g^{*}({\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)-a_{m,n-1}{j}^{-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,0)-a_{m,n+1}{\mathrm{jA}}_g^{*}({\mathrm{\&tau;}}_0,0)\\ +a_{m+1,n-1}{j}^{2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)-a_{m+1,n}{j}^{2n+1}{A}_g^{*}(0,{\mathrm{\&upsi;}}_0)+a_{n+1,n+1}{j}^{2n+3}{A}_g^{*}({\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)+\mathrm{...}\end{array}---\left(10\right)$

According to the reception data in Fig. 5 assistance data formula (8)For:

$\begin{array}{c}{\hat{a}}_{m,n}^2\&ap;\mathrm{...}+a_{m,n}{A}_g^{*}(0,0)-a_{m-1,n-1}{j}^{-2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)+a_{m-1,n}{j}^{-2n-1}{A}_g^{*}(0,-{\mathrm{\&upsi;}}_0)\\ -a_{m-1,n+1}{j}^{-2n-1}{A}_g^{*}({\mathrm{\&tau;}}_0,-{\mathrm{\&upsi;}}_0)+a_{m,n-1}{j}^{-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,0)+a_{m,n+1}{\mathrm{jA}}_g^{*}({\mathrm{\&tau;}}_0,0)\\ -a_{m+1,n-1}{j}^{2n-1}{A}_g^{*}(-{\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)+a_{m+1,n}{j}^{2n+1}{A}_g^{*}(0,{\mathrm{\&upsi;}}_0)-a_{m+1,n+1}{j}^{2n+3}{A}_g^{*}({\mathrm{\&tau;}}_0,{\mathrm{\&upsi;}}_0)+\mathrm{...}\end{array}---\left(11\right)$

It can thus be seen that the interference of auxiliary signal receiving terminal data division is the most contrary with the interference in originally transmitted data Number, at receiving terminal, is first according to FBMC by receiving signal and does the demodulation process corresponding to transmitting terminal, originally transmitted to receive Data h₁s₁+n₁, and auxiliary transmission data h received₂s₂+n₂Do phase add operation, obtain:

$({\hat{a}}_{m,n}^1+{\hat{a}}_{m,n}^2)/2\&ap;+a_{m,n}{A}_g^{*}(0,0)+a_{m-1,n}{j}^{-2n-1}{A}_g^{*}(0,-{\mathrm{\&nu;}}_0)+a_{m+1,n}{j}^{2n+1}{A}_g^{*}(0,{\mathrm{\&nu;}}_0)---\left(12\right)$

Counteract the part interference in initial data, other operations such as equilibrium are not resulted in impact yet.As shown in Figure 6, When the interference of auxiliary signal receiving terminal data division is identical with the interference in originally transmitted data, only need to be at receiving terminal by both phases Subtract, the part interference counteracting in initial data can be realized equally, other operations such as equilibrium are not resulted in impact yet.

Those of ordinary skill in the art it will be appreciated that embodiment described here be to aid in reader understanding this Bright principle, it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.For ability For the technical staff in territory, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made Any modification, equivalent substitution and improvement etc., within should be included in scope of the presently claimed invention.

Claims (3)

1. FBMC system equalization method based on assistance data, it is characterised in that including:

S1, transmitting terminal data process；Specifically include following step by step:

S11, according to originally transmitted data produce assistance data；

S12, assistance data to originally transmitted data Yu step S11, carry out quadrature amplitude modulation；

S13, step S12 modulate after data block header add pilot frequency sequence；

S14, the data obtaining step S13 are orthogonalized phase mapping；

S15, the data obtaining step S14 carry out IFFT conversion；

S16, step S15 is obtained data it is filtered processing, and launch；

S2, receiving terminal data process, specifically include following step by step:

S21, the data received are carried out matched filtering process；

S22, the data obtaining step S21 carry out FFT, obtain originally transmitted data and auxiliary sends data；

S23, the originally transmitted data obtaining step S22 and auxiliary send data, do coherent operations and divided by 2；

S24, the data obtaining step S23, extract channel information according to pilot frequency sequence, then according to the channel information extracted, Do equilibrium treatment and eliminate multi-path jamming；

S25, the data obtaining step S24 carry out recovering orthogonalization phase mapping and process；

S26, the data obtaining step S25 carry out QAM demodulation.

FBMC system equalization method based on assistance data the most according to claim 1, it is characterised in that step S11 institute State conjugation data or negative conjugation data that assistance data is originally transmitted data.

FBMC system equalization method based on assistance data the most according to claim 1, it is characterised in that step S23 institute State coherent operations, if particularly as follows: the conjugation data that assistance data is initial data, then doing phase reducing；If assistance data is former The negative conjugation data of beginning data, then do phase add operation.