CN106161315A - Signal processing method and wireless signal transceiver - Google Patents

Abstract

The embodiment of the invention discloses a kind of signal processing method and wireless signal transceiver, described method includes: by modulates baseband signals to be transmitted at least one subcarrier；Base band molding filtration parameter and spectral expansion coefficients is determined for being modulated with at least one subcarrier described in described baseband signal to be transmitted；Described base band molding filtration parameter is carried out time domain and frequency domain shifting processing；Based on the described base band molding filtration parameter after shifting processing, at least one subcarrier described is filtered, it is thus achieved that the first modulated sub-carriers；Based on described spectral expansion coefficients, described first modulated sub-carriers is carried out spread spectrum, obtain described second modulated sub-carriers；Carry out data transmission based on described second modulated sub-carriers.

Description

Signal processing method and wireless signal transceiver

Technical field

The present invention relates to signal processing technology, be specifically related to a kind of signal processing method and wireless signal transmitting-receiving sets Standby.

Background technology

5th Generation Mobile Communication System 5G higher requirement to the technology of eating dishes without rice or wine, wherein waveform technology is to eat dishes without rice or wine The basis of technology.When by GFDM waveform transmission sub-frame data, exist when carrying out sub-frame data modulation Nonorthogonality between the subcarrier used i.e. there are carrier-in-interference (ICI, Inter-Carrier Interference).Further, system can be caused to process complexity by GFDM transmission data the highest.How Reduce ICI and reduction processes the technical problem that complexity becomes urgently to be resolved hurrily.

Summary of the invention

The embodiment of the present invention provides a kind of signal processing method and wireless signal transceiver.

The technical scheme of the embodiment of the present invention is achieved in that

A kind of signal processing method, is applied to wireless signal transceiver, and described method includes:

By modulates baseband signals to be transmitted at least one subcarrier；

Determine that base band molding filtration is joined for being modulated with at least one subcarrier described in described baseband signal to be transmitted Number and spectral expansion coefficients；

Described base band molding filtration parameter is carried out time domain and frequency domain shifting processing；

Based on the described base band molding filtration parameter after shifting processing, at least one subcarrier described is filtered Ripple, it is thus achieved that the first modulated sub-carriers；

Based on described spectral expansion coefficients, described first modulated sub-carriers is carried out spread spectrum, obtain described Two modulated sub-carriers；

Carry out data transmission based on described second modulated sub-carriers.

A kind of wireless signal transceiver, described equipment includes: modulating unit, determine unit, shift unit, First filter unit, expanding element and transmission unit, wherein:

Modulating unit, is used for modulates baseband signals to be transmitted at least one subcarrier；

Determining unit, at least one subcarrier described being used for being to be modulated with described baseband signal to be transmitted determines Base band molding filtration parameter and spectral expansion coefficients；

Shift unit, for carrying out time domain and frequency domain shifting processing to described base band molding filtration parameter；

First filter unit, for based on the described base band molding filtration parameter after shifting processing to described at least One subcarrier is filtered, it is thus achieved that the first modulated sub-carriers；

Expanding element, for carrying out frequency spectrum expansion based on described spectral expansion coefficients to described first modulated sub-carriers Exhibition, obtains described second modulated sub-carriers；

Transmission unit, for carrying out data transmission based on described second modulated sub-carriers.

In the embodiment of the present invention, by extending the interval between the subcarrier in former GFDM system so that every PSD (Power Spectrum Density) after individual subcarrier data channel filtering molding entirely without overlap, Thus eliminate the interference of ICI, for improving the utilization rate of carrier wave, by the parameter of design FTN modulation compression, Thus improve bandwidth availability ratio, offset and cause system because of the interval between extension GFDM sub-carriers The decline of band efficiency.In the embodiment of the present invention, above-mentioned extension subcarrier spacing and carrier frequency is compressed Technology so that the complexity of signal transmission is higher, therefore, when being filtered carrier wave processing, logical Cross the spreading coefficient that frequency domain filtering is set, make filtered signal complexity be substantially reduced.The embodiment of the present invention Reduce the interference of intercarrier, the utilization rate of carrier wave can't be caused to reduce, and make what wireless signal processed to answer Miscellaneous degree controls at zone of reasonableness.

Accompanying drawing explanation

Fig. 1 is the flow chart of the signal processing method of the embodiment of the present invention one；

Fig. 2 is the flow chart of the signal processing method of the embodiment of the present invention two；

Fig. 3 is the wireless signal transmitter principle schematic of the embodiment of the present invention；

Fig. 4 is the flow chart of the signal processing method of the embodiment of the present invention three；

Fig. 5 is another principle schematic of wireless signal transmitter of the embodiment of the present invention；

Fig. 6 is the composition structural representation of the wireless signal transceiver of the embodiment of the present invention.

Detailed description of the invention

In order to more fully hereinafter understand feature and the technology contents of the present invention, below in conjunction with the accompanying drawings to this Bright realization is described in detail, appended accompanying drawing purposes of discussion only for reference, is not used for limiting the present invention.

Fig. 1 is the flow chart of the signal processing method of the embodiment of the present invention one, as it is shown in figure 1, this example Signal processing method is applied to wireless signal transceiver.In the embodiment of the present invention, wireless signal transceiver Can be antenna system, this antenna system can be applicable in base station, mobile terminal, it is also possible to is applied to wireless In the wireless transmitting-receiving equipments such as router, relay station.The signal processing method of the embodiment of the present invention includes following step Rapid:

Step 101, by modulates baseband signals to be transmitted at least one subcarrier.

In the embodiment of the present invention, it is thus achieved that baseband signal waiting for transmission, by this modulates baseband signals to corresponding son On carrier wave.

Step 102, determines base band for being modulated with at least one subcarrier described in described baseband signal to be transmitted Molding filtration parameter and spectral expansion coefficients.

The embodiment of the present invention combines FTN (First Than Nquist) technology on the basis of GFDM, proposes A kind of new waveform: GFDM-FTN.It is fixed that this waveform can break through BLT (Bailian-Low theorem) The restriction of reason, keep base band molding pulse motility and orthogonality between subcarrier while, When signal to noise ratio (SNR, Signal Noise Ratio) tends to infinity, GFDM-FTN can reach Nai Kui Si Te (Nquist) maximum bandwidth utilization rate.

In the embodiment of the present invention, GFDM signal discrete mathematical model is represented by:

If (k, m) for being modulated the complex symbol of the information of carrying, in following K × M rank matrix represents a subframe for s Modulated complex signal set^[6]:

Subcarrier base band formed filter g (n) can be selected for SINC function, RC (Raised Cosine) function, RRC (Root Raised Cosine) function etc..But sinc filter hangover is relatively big, and RC wave filter is at a The when of being worth less, hangover decay is quickly, it is contemplated that the situation of sending and receiving end one, due to RC wave filter not Meet Nquist criterion, bigger intersymbol interference can be caused.RRC wave filter meets Nquist criterion, but Hangover decay is fast not, considers, designs the base band formed filter on each subcarrier, obtain base band Molding filtration parameter g (n), and spectral expansion coefficients (rolloff-factor) a.

In the embodiment of the present invention, involved parameter and implication thereof are as follows:

G (n) represents the discrete series of subcarrier formed filter.

A represents the rolloff-factor (spectral expansion coefficients) of g (n).

Wa represents the actual bandwidth after GFDM subcarrier molding filtration.

f_cRepresent the interval between GFDM subcarrier.

T_sFor code-element period on subcarrier each in GFDM.

K represents the subcarrier number of the modulation in mono-subframe of GFDM.

The up-sampling multiple of N ptototype filter g (n).

M represents the number of timeslots in the subframe of an original GFDM.

F_gfRepresent that GFDM conversion obtains the interval between the subcarrier of new waveform GFDM-FTN.

R represents the time domain data compression coefficient in FTN technology.

T_gfSymbol sample interval on the new each subcarrier of waveform GFDM-FTN after representing conversion.

K_gfInterior subcarrier number in new mono-subframe of waveform GFDM-FTN after representing conversion.

M_gfRepresent that conversion forms the number of timeslots in mono-subframe of new waveform GFDM-FTN.

Step 103, carries out time domain and frequency domain shifting processing to described base band molding filtration parameter.

Specifically, it is assumed that m (m=0,1,2 ... M-1) and k (k=0,1,2 ... K-1) represents a subframe respectively The index of subcarrier in interior time slot index and pre-set bandwidths, on each time slot at corresponding each subcarrier, G (n) carries out time domain and frequency domain displacement, and the expression formula after displacement is

Step 104, based on the described base band molding filtration parameter after shifting processing at least one sub-load described Ripple is filtered, it is thus achieved that the first modulated sub-carriers.

K≤N, 0≤n≤NM (1)

Now, according to GFDM generating principle, obtain K subcarrier.

Step 105, carries out spread spectrum based on described spectral expansion coefficients to described first modulated sub-carriers, Obtain described second modulated sub-carriers, carry out data transmission with described second modulated sub-carriers.

In the embodiment of the present invention, after group baseband ptototype filter has designed, further determine and roll-off Coefficient a.And extending subcarrier spacing for (1+a) again, the interval between subcarrier after both extending becomes F_f, K can be accommodated under pre-designed system bandwidth simultaneously_fIndividual subcarrier.

f_gf=(1+a) f_c

$K_{\mathrm{gf}}=\frac{K}{1+a}$

By total bandwidth fc and the value of a of appropriate design system so that the subcarrier number after extension is also Integer.The signal of extension, non-overlapping between subcarrier, the most orthogonal, thus can remove ICI's completely Interference.

In the embodiment of the present invention, by the subcarrier of above-mentioned transmission base band being filtered process, can make Interval between subcarrier becomes big, makes to produce ICI interference between each subcarrier, but due to subcarrier it Between interval relatively big, the utilization rate that can cause carrier frequency is at a fairly low.

Fig. 2 is the flow chart of the signal processing method of the embodiment of the present invention two, as in figure 2 it is shown, this example Signal processing method is applied to wireless signal transceiver.In the embodiment of the present invention, wireless signal transceiver Can be antenna system, this antenna system can be applicable in base station, mobile terminal, it is also possible to is applied to wireless In the wireless transmitting-receiving equipments such as router, relay station.The signal processing method of the embodiment of the present invention includes following step Rapid:

Step 201, by modulates baseband signals to be transmitted at least one subcarrier.

In the embodiment of the present invention, it is thus achieved that baseband signal waiting for transmission, by this modulates baseband signals to corresponding son On carrier wave.

Step 202, determines base band for being modulated with at least one subcarrier described in described baseband signal to be transmitted Molding filtration parameter and spectral expansion coefficients.

The embodiment of the present invention combines FTN (First Than Nquist) technology on the basis of GFDM, proposes A kind of new waveform: GFDM-FTN.It is fixed that this waveform can break through BLT (Bailian-Low theorem) The restriction of reason, keep base band molding pulse motility and orthogonality between subcarrier while, When signal to noise ratio (SNR, Signal Noise Ratio) tends to infinity, GFDM-FTN can reach Nai Kui Si Te (Nquist) maximum bandwidth utilization rate.

In the embodiment of the present invention, GFDM signal discrete mathematical model is represented by:

If (k, m) for being modulated the complex symbol of the information of carrying, in following K × M rank matrix represents a subframe for s Modulated complex signal set^[6]:

Subcarrier base band formed filter g (n) can be selected for SINC function, RC (Raised Cosine) function, RRC (Root Raised Cosine) function etc..But sinc filter hangover is relatively big, and RC wave filter is at a The when of being worth less, hangover decay is quickly, it is contemplated that the situation of sending and receiving end one, due to RC wave filter not Meet Nquist criterion, bigger intersymbol interference can be caused.RRC wave filter meets Nquist criterion, but Hangover decay is fast not, considers, designs the base band formed filter on each subcarrier, obtain base band Molding filtration parameter g (n), and spectral expansion coefficients (rolloff-factor) a.

In the embodiment of the present invention, involved parameter and implication thereof are as follows:

G (n) represents the discrete series of subcarrier formed filter.

A represents the rolloff-factor (spectral expansion coefficients) of g (n).

Wa represents the actual bandwidth after GFDM subcarrier molding filtration.

f_cRepresent the interval between GFDM subcarrier.

T_sFor code-element period on subcarrier each in GFDM.

K represents the subcarrier number of the modulation in mono-subframe of GFDM.

The up-sampling multiple of N ptototype filter g (n).

M represents the number of timeslots in the subframe of an original GFDM.

F_gfRepresent that GFDM conversion obtains the interval between the subcarrier of new waveform GFDM-FTN.

R represents the time domain data compression coefficient in FTN technology.

T_gfSymbol sample interval on the new each subcarrier of waveform GFDM-FTN after representing conversion.

K_gfInterior subcarrier number in new mono-subframe of waveform GFDM-FTN after representing conversion.

M_gfRepresent that conversion forms the number of timeslots in mono-subframe of new waveform GFDM-FTN.

Step 403, carries out time domain and frequency domain shifting processing to described base band molding filtration parameter.

Specifically, it is assumed that m (m=0,1,2 ... M-1) and k (k=0,1,2 ... K-1) represents a subframe respectively The index of subcarrier in interior time slot index and pre-set bandwidths, on each time slot at corresponding each subcarrier, G (n) carries out time domain and frequency domain displacement, and the expression formula after displacement is

Step 404, based on the described base band molding filtration parameter after shifting processing at least one sub-load described Ripple is filtered, it is thus achieved that the first modulated sub-carriers.

K≤N, 0≤n≤NM

Now, according to GFDM generating principle, obtain K subcarrier.

Step 405, carries out spread spectrum based on described spectral expansion coefficients to described first modulated sub-carriers, Obtain described second modulated sub-carriers.

In the embodiment of the present invention, after group baseband ptototype filter has designed, further determine and roll-off Coefficient a.And extending subcarrier spacing for (1+a) again, the interval between subcarrier after both extending becomes F_f, K can be accommodated under pre-designed system bandwidth simultaneously_fIndividual subcarrier.

f_gf=(1+a) f_c

$K_{\mathrm{gf}}=\frac{K}{1+a}$

Value by the total bandwidth of appropriate design system, fc, and a so that the subcarrier number after extension Also it is integer.The signal of extension, non-overlapping between subcarrier, the most orthogonal, thus ICI can be removed completely Interference.

Step 406, determines the time domain data compression system of described second modulated sub-carriers according to described spectral expansion coefficients Number.

The FTN time domain data compression coefficient designed on each subcarrier is r, 0 < r < 1.

And the code-element period on subcarrier becomes T_gf, introduce ISI by artificial, every height in making a frame The number of timeslots that can accommodate in carrier wave is M_gf。

The spaced relationship of parameters is as follows:

$r=\frac{1}{1+a}(0<r\&le;1),$

In the embodiment of the present invention, say, that using the inverse of described spectral expansion coefficients and 1 sum as institute State time domain data compression coefficient r.

$T_{\mathrm{gf}}=r{T}_s=\frac{T_s}{1+a}$

$M_{\mathrm{gf}}=\frac{M}{r}=(1+a)M$

Now, provable, after above-mentioned process, Nquist theoretical maximum bandwidth availability ratio can be reached.Card Bright as follows:

$r=\frac{1}{1+a}=\frac{\frac{1}{2T_s}}{\frac{1}{2T_s}(1+a)}=\frac{\frac{1}{2T_s}}{f_c(1+a)}=\frac{1}{2T_s{W}_a}$

WhenFor optimum, the theoretical maximum channel capacity of Nquist can be reached.

Step 407, carries out time domain data compression based on described time domain data compression coefficient to described second modulated sub-carriers, Obtain the 3rd modulated sub-carriers；Carry out data transmission with described 3rd modulated sub-carriers.

Described time domain data compression is for making the narrower intervals between described second modulated sub-carriers.

Modulated data (K × Metzler matrix) in mono-subframe of the original GFDM of new mappings, for new matrix K_gf×M_gfIf, s_gf(k m) represents a complex symbol the most modulated in set.Then have:

$K_{\mathrm{gf}}\&times;M_{\mathrm{gf}}=\frac{K}{1+a}\&times;(1+a)M=K\&times;M$

I.e. in unit sub-frame frame, the quantity of information of transmission is not changed in.

G (n) is base band pulse formed filter, the up-sampling multiple of N ptototype filter g (n), new after conversion N value in waveform GFDM-FTN keeps constant, and GFDM-FTN transmission signal is expressed as:

K_gf≤ rN, 0≤n≤NM (NM_gf/ r=NM)

Above-mentioned formula is the signal to be transmitted having carried out time domain data compression.Be may determine that by above-mentioned formula The transmitter architecture that the direct time-domain of GFDM-FTN signal realizes, as shown in Figure 3.

Fig. 4 is the flow chart of the signal processing method of the embodiment of the present invention three, as shown in Figure 4, this example Signal processing method is applied to wireless signal transceiver.In the embodiment of the present invention, wireless signal transceiver Can be antenna system, this antenna system can be applicable in base station, mobile terminal, it is also possible to is applied to wireless In the wireless transmitting-receiving equipments such as router, relay station.The signal processing method of the embodiment of the present invention includes following step Rapid:

Step 401, by modulates baseband signals to be transmitted at least one subcarrier.

In the embodiment of the present invention, it is thus achieved that baseband signal waiting for transmission, by this modulates baseband signals to corresponding son On carrier wave.

Step 402, determines base band for being modulated with at least one subcarrier described in described baseband signal to be transmitted Molding filtration parameter and spectral expansion coefficients.

The embodiment of the present invention combines FTN (First Than Nquist) technology on the basis of GFDM, proposes A kind of new waveform: GFDM-FTN.It is fixed that this waveform can break through BLT (Bailian-Low theorem) The restriction of reason, keep base band molding pulse motility and orthogonality between subcarrier while, When signal to noise ratio (SNR, Signal Noise Ratio) tends to infinity, GFDM-FTN can reach Nai Kui Si Te (Nquist) maximum bandwidth utilization rate.

In the embodiment of the present invention, GFDM signal discrete mathematical model is represented by:

If (k, m) for being modulated the complex symbol of the information of carrying, in following K × M rank matrix represents a subframe for s Modulated complex signal set:

Subcarrier base band formed filter g (n) can be selected for SINC function, RC (Raised Cosine) function, RRC (Root Raised Cosine) function etc..But sinc filter hangover is relatively big, and RC wave filter is at a The when of being worth less, hangover decay is quickly, it is contemplated that the situation of sending and receiving end one, due to RC wave filter not Meet Nquist criterion, bigger intersymbol interference can be caused.RRC wave filter meets Nquist criterion, but Hangover decay is fast not, considers, designs the base band formed filter on each subcarrier, obtain base band Molding filtration parameter g (n), and spectral expansion coefficients (rolloff-factor) a.

In the embodiment of the present invention, involved parameter and implication thereof are as follows:

G (n) represents the discrete series of subcarrier formed filter.

A represents the rolloff-factor (spectral expansion coefficients) of g (n).

Wa represents the actual bandwidth after GFDM subcarrier molding filtration.

f_cRepresent the interval between GFDM subcarrier.

T_sFor code-element period on subcarrier each in GFDM.

K represents the subcarrier number of the modulation in mono-subframe of GFDM.

The up-sampling multiple of N ptototype filter g (n).

M represents the number of timeslots in the subframe of an original GFDM.

F_gfRepresent that GFDM conversion obtains the interval between the subcarrier of new waveform GFDM-FTN.

R represents the time domain data compression coefficient in FTN technology.

T_gfSymbol sample interval on the new each subcarrier of waveform GFDM-FTN after representing conversion.

K_gfInterior subcarrier number in new mono-subframe of waveform GFDM-FTN after representing conversion.

M_gfRepresent that conversion forms the number of timeslots in mono-subframe of new waveform GFDM-FTN.

Step 403, carries out time domain and frequency domain shifting processing to described base band molding filtration parameter.

Specifically, it is assumed that m (m=0,1,2 ... M-1) and k (k=0,1,2 ... K-1) represents a subframe respectively The index of subcarrier in interior time slot index and pre-set bandwidths, on each time slot at corresponding each subcarrier, G (n) carries out time domain and frequency domain displacement, and the expression formula after displacement is

Step 404, arranges spreading coefficient for the frequency domain filtering parameter in described base band molding filtration, makes described The frequency response broadening of base band molding filtration parameter.

Step 405, carries out Fourier transformation by least one subcarrier described, by least one sub-load described Wave conversion is frequency-region signal；

Step 406, based on the described base band molding filtration parameter after described spreading coefficient and shifting processing to institute State frequency-region signal to be filtered, filtered signal is carried out inversefouriertransform and obtains described first modulation Subcarrier.

Step 407, carries out spread spectrum based on described spectral expansion coefficients to described first modulated sub-carriers, Obtain described second modulated sub-carriers.

In the embodiment of the present invention, after group baseband ptototype filter has designed, further determine rolling Fall coefficient a.And extending subcarrier spacing for (1+a) again, the interval between subcarrier after both extending becomes F_f, K can be accommodated under pre-designed system bandwidth simultaneously_fIndividual subcarrier.

f_gf=(1+a) f_c

$K_{\mathrm{gf}}=\frac{K}{1+a}$

Value by the total bandwidth of appropriate design system, fc, and a so that the subcarrier number after extension Also it is integer.The signal of extension, non-overlapping between subcarrier, the most orthogonal, thus ICI can be removed completely Interference.

Step 808, determines the time domain data compression system of described second modulated sub-carriers according to described spectral expansion coefficients Number.

The FTN time domain data compression coefficient designed on each subcarrier is r, 0 < r < 1.

And the code-element period on subcarrier becomes T_gf, introduce ISI by artificial, every height in making a frame The number of timeslots that can accommodate in carrier wave is M_gf。

The spaced relationship of parameters is as follows:

$r=\frac{1}{1+a}(0<r\&le;1)$

In the embodiment of the present invention, say, that using the inverse of described spectral expansion coefficients and 1 sum as institute State time domain data compression coefficient r.

$T_{\mathrm{gf}}=r{T}_s=\frac{T_s}{1+a}$

$M_{\mathrm{gf}}=\frac{M}{r}=(1+a)M$

Now, provable, after above-mentioned process, Nquist theoretical maximum bandwidth availability ratio can be reached.Card Bright as follows:

$r=\frac{1}{1+a}=\frac{\frac{1}{2T_s}}{\frac{1}{2T_s}(1+a)}=\frac{\frac{1}{2T_s}}{f_c(1+a)}=\frac{1}{2T_s{W}_a}$

WhenFor optimum, the theoretical maximum channel capacity of Nquist can be reached.

Step 409, carries out time domain data compression based on described time domain data compression coefficient to described second modulated sub-carriers, Obtain the 3rd modulated sub-carriers；Carry out data transmission with described 3rd modulated sub-carriers.

Described time domain data compression is for making the narrower intervals between described second modulated sub-carriers.

In the present embodiment, a GFDM-FTN sub-frame data is by matrix K_f×M_fRepresent, if s_f(k m) represents collection A complex symbol the most modulated in conjunction.Then have:

$K_{\mathrm{gf}}\&times;M_{\mathrm{gf}}=\frac{K}{1+a}\&times;(1+a)M=K\&times;M---\left(7\right)$

G (n) is base band pulse molding filtration parameter, and N distributes in representing original GFDM systemic presupposition bandwidth Sub-carrier channels quantity, the N value in the new waveform GFDM-FTN after conversion keeps constant, Filtering Processing After GFDM-FTN transmission signal be expressed as:

$x_{\mathrm{gf}}\left(n\right)=\underset{m=0}{\overset{M_{\mathrm{gf}}-1}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{K_{\mathrm{gf}}-1}{\mathrm{\&Sigma;}}}{s}_{\mathrm{gf}}(k,m)g(n-m\&CenterDot;\mathrm{rN})e^{j2\mathrm{\&pi;}\frac{\mathrm{nk}}{\mathrm{Nr}}}$

$K_{\mathrm{gf}}\&le;\mathrm{rN},0\&le;n\&le;\mathrm{NM}(\frac{{\mathrm{NM}}_f}{r}=\mathrm{NM})$

Generally, on the basis of the number of the complex multiplier that complexity needs during realizing, it is considered to GFDM-FTN signal and the discrete models of ofdm signal, can obtain the direct real of two kinds of signals Existing complexity is:

GFDM-FTN:

$C_{\mathrm{GFDM}-\mathrm{FTN},\&CircleTimes;}=K_{\mathrm{gf}}{\mathrm{NM}}_{\mathrm{gf}}^2---\left(9\right)$

Orthogonal frequency division multiplex OFDM symbol table is shown as:

$C_{\mathrm{OFDM},\&CircleTimes;}=K_{\mathrm{gf}}N{\log }_{2}N$

Modulated complex signal baseband molding on subcarrier, logical producing can replace linear convolution with cyclic convolution, then Aforesaid transmission signal x_gfN () is transformed to:

G (n) is ptototype filter,Represent corresponding subcarrier deviation post in frequency domain, s_f(k, m) δ (n-rmN) then represents the complex symbol data stream modulated after up-sampling on each subcarrier.According to Time-domain and frequency-domain equivalence principle, aforementioned transmission signal is equivalent to:

In aforementioned formula, DFT_NM(.) and IDFT_NM(.) represents in NM point discrete Fourier leaf transformation and discrete respectively Inverse Fourier transform.Its implication is as follows:

The result of FFT is equal toCan be understood as ptototype filter in frequency domain Displacement.

${\mathrm{DFT}}_{\mathrm{NM}}\left(s_{\mathrm{gf}}(k,m)\mathrm{\&delta;}(n-m\&CenterDot;\mathrm{rN})\right)={\mathrm{DFT}}_{\mathrm{rN}\&CenterDot;M_f}\left(s_{\mathrm{gf}}(k,m)\mathrm{\&delta;}(n-m\&CenterDot;\mathrm{rN})\right)$ It is equivalent to first doThen by the result that obtains with M_fRepeat rN time for the cycle.

DFT_NM(g(<n>_NM-1)) represent ptototype filter g (n) frequency domain transform.

By above-mentioned transformation for mula, in upper spectrum distribution after g (n) discrete NM point Fourier transformation, Great majority are all zero, and ideally, g (n) (wave filter g (n) of loop structure) is through NM point FFT After conversion in frequency domain effectively, non-zero number is (1+a) M=M_gf。

But, for being wirelessly transferred, time domain prototype Pulse shaped filter g (n) length is time-limited, I.e. there is the truncation effect of time domain, correspond to frequency domain, the frequency response of g (n) understands broadening accordingly, whole PSD (the Power Spectrum Density) distribution situation of raw base band Pulse shaped filter in NM point (in the case of normalization).The frequency domain filter coefficient going up a little correspondence is all not zero.Thus doing frequency domain filter During ripple (multiplication), if only taking (1+a) M=M_fPoint does multiplication, is equivalent to the truncation effect of frequency domain, corresponding To time domain, (ISI, Inter-Symbol Interference) can be disturbed between created symbol.Thus at frequency filtering Time, can suitably extend the length that frequency domain filtering multiplication calculates, this is to sacrifice complexity and introduce ISI certainly For cost.

If L is the spreading coefficient of frequency domain filtering, then there is 1≤L≤rN.The multiplication of each sub-carrier frequency domain filtering Length becomes LM_gfIndividual, there is M_gf≤LM_gf≤rNM_gf=NM, now structure such as Fig. 5 of the corresponding transmitter simplified Shown in.

The value of L can be come according to the size of the spreading coefficient a of prototype Pulse shaped filter g (n) of design Choosing, such as a value is smaller when, and spread spectrum is less, and L-value can take less value, otherwise The most anti-.

It is (based on FFT) that analysis can obtain the complexity of realization now:

$\begin{array}{c}{C}_{\mathrm{GFDM}-\mathrm{FTN},\mathrm{FFT}}=K_{\mathrm{gf}}\&CenterDot;M_{\mathrm{gf}}{\log }_2{M}_{\mathrm{gf}}+K_{\mathrm{gf}}\&CenterDot;L\&CenterDot;M_{\mathrm{gf}}+\mathrm{rN}\&CenterDot;M_{\mathrm{gf}}{\log }_2\mathrm{rN}\&CenterDot;M_{\mathrm{gf}}\\ ={\mathrm{KM}\log }_2\frac{M}{r}+\mathrm{KLM}+\mathrm{NM}{\log }_2\mathrm{NM}\\ =\mathrm{MN}{\log }_{2}N+(K+N){\log }_{2}M+\mathrm{KM}{\log }_2\frac{1}{r}+\mathrm{KLM}\end{array}$

In existing LTE standard, subframe structure is as foundation, as shown in table 1 below, each in a subframe Data parameters is as follows.

Parameter	Value	Describe
			B	20MHz	Channel width
BSC	15kHz	Subcarrier spacing
			N	2048	Maximum number of subcarriers
K	1200	Effectively number of subcarriers
			Wave filter	RRC	Formed filter
a	0.25	Rolloff-factor
			r	0.8	FTN coefficient of compressibility
BSCgf	18.75kHz	Subcarrier spacing after extension
			Kgf	960	Subcarrier number after extension
Mgf	{15,17.5}	After time domain data compression, timeslot number in subframe

		Amount
			L	1≤L≤rN=1638.4	Frequency domain filtering multiplication spreading coefficient

Table 1

LTE system comprises 12, or 14 ofdm in one TTI (Tranmission time interval) Symbol, i.e. M=12,14.

Fig. 6 is the composition structural representation of the wireless signal transceiver of the embodiment of the present invention, as shown in Figure 6, The wireless signal transceiver of this example includes: modulating unit 60, first determine unit 61, shift unit 62, the first filter unit 63, expanding element 64 and transmission unit 65, wherein:

Modulating unit 60, is used for modulates baseband signals to be transmitted at least one subcarrier；

First determines unit 61, at least one the sub-load described for being modulated with described baseband signal to be transmitted Ripple determines base band molding filtration parameter and spectral expansion coefficients；

Shift unit 62, for carrying out time domain and frequency domain shifting processing to described base band molding filtration parameter；

First filter unit 63, for based on the described base band molding filtration parameter after shifting processing to described extremely A few subcarrier is filtered, it is thus achieved that the first modulated sub-carriers；

Expanding element 64, for carrying out frequency spectrum based on described spectral expansion coefficients to described first modulated sub-carriers Extension, obtains described second modulated sub-carriers；

Transmission unit 65, for carrying out data transmission based on described second modulated sub-carriers.

On the basis of the wireless signal transceiver shown in Fig. 6, the wireless signal transmitting-receiving of the embodiment of the present invention Equipment also includes: second determines unit (not shown in Fig. 6) and compression unit (not shown in Fig. 6), its In:

Second determines unit, for according to described spectral expansion coefficients determine described second modulated sub-carriers time Territory coefficient of compressibility；

Compression unit, for carrying out time domain pressure based on described time domain data compression coefficient to described second modulated sub-carriers Contracting, obtains the 3rd modulated sub-carriers；Described time domain data compression is between making between described second modulated sub-carriers Every narrowing；

Transmission unit, is additionally operable to carry out data transmission with described 3rd modulated sub-carriers.

Above-mentioned second determines unit, is additionally operable to the inverse of described spectral expansion coefficients and 1 sum as described Time domain data compression coefficient.

On the basis of the wireless signal transceiver shown in Fig. 6, the wireless signal transmitting-receiving of the embodiment of the present invention Equipment also includes: arrange unit (not shown in Fig. 6), the first converter unit (not shown in Fig. 6), Two filter units (not shown in Fig. 6) and the second converter unit (not shown in Fig. 6), wherein:

Unit is set, for based on the described base band molding filtration parameter after shifting processing to described at least one When individual subcarrier is filtered, spreading coefficient is set for the frequency domain filtering parameter in described base band molding filtration, Make the frequency response broadening of described base band molding filtration parameter；

First converter unit, at least one subcarrier described is carried out Fourier transformation, by described at least One sub-carrier transformation is frequency-region signal；

Second filter unit, the described base band molding filter after being additionally operable to based on described spreading coefficient and shifting processing Described frequency-region signal is filtered by wave parameter；

Second converter unit, is used for filtered signal being carried out inversefouriertransform and obtaining described first and adjust Subcarriers.

In the embodiment of the present invention, described spectral expansion coefficients and described spectral expansion coefficients positive correlation.

It will be appreciated by those skilled in the art that and the wireless signal transceiver shown in Fig. 6 respectively processes list The function that realizes of unit can refer to aforementioned signal processing method and the associated description of embodiment and understands.This area It will be appreciated by the skilled person that the function of each processing unit can be passed through in the wireless signal transceiver shown in Fig. 6 Run on the program on processor and realize, it is possible to realized by concrete logic circuit.

Between technical scheme described in the embodiment of the present invention, in the case of not conflicting, can be in any combination.

In several embodiments provided by the present invention, it should be understood that disclosed method, device and electricity Subset, can realize by another way.Apparatus embodiments described above is only schematically, Such as, the division of described unit, be only a kind of logic function and divide, actual can have when realizing other Dividing mode, such as: multiple unit or assembly can be in conjunction with, or are desirably integrated into another system, or some Feature can be ignored, or does not performs.It addition, the coupling each other of shown or discussed each ingredient, Or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, equipment or unit or communication Connect, can be electrical, machinery or other form.

The above-mentioned unit illustrated as separating component can be or may not be physically separate, as The parts that unit shows can be or may not be physical location, i.e. may be located at a place, it is possible to To be distributed on multiple NE；Part or all of unit therein can be selected according to the actual needs Realize the purpose of the present embodiment scheme.

It addition, each functional unit in various embodiments of the present invention can be fully integrated in a processing unit, Can also be that each unit is individually as a unit, it is also possible to two or more unit are integrated in one In individual unit；Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ hardware adds should Realize by the form of functional unit.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can Completing with the hardware relevant by programmed instruction, aforesaid program can be stored in an embodied on computer readable and deposit In storage media, this program upon execution, performs to include the step of said method embodiment；And aforesaid storage Medium includes: movable storage device, read only memory (ROM, Read-Only Memory), deposit at random Access to memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.

Or, if the above-mentioned integrated unit of the embodiment of the present invention realizes with the form of applied function module and makees During for independent production marketing or use, it is also possible to be stored in a computer read/write memory medium.Base In such understanding, prior art is contributed by the technical scheme of the embodiment of the present invention the most in other words Part can embody with the form of application product, and these computer application products are stored in a storage medium In, including some instructions with so that computer equipment (can be personal computer, server or Person's network equipment etc.) perform all or part of of method described in each embodiment of the present invention.And aforesaid storage Medium includes: movable storage device, read only memory (ROM, Read-Only Memory), deposit at random Access to memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.

Protection scope of the present invention is not limited thereto, and those familiar with the art takes off in the present invention In the technical scope of dew, change can be readily occurred in or replace, all should contain within protection scope of the present invention.

The above, only presently preferred embodiments of the present invention, it is not intended to limit the protection model of the present invention Enclose.

Claims (10)

1. a signal processing method, is applied to wireless signal transceiver, and described method includes:

By modulates baseband signals to be transmitted at least one subcarrier；

Determine that base band molding filtration is joined for being modulated with at least one subcarrier described in described baseband signal to be transmitted Number and spectral expansion coefficients；

Described base band molding filtration parameter is carried out time domain and frequency domain shifting processing；

Based on the described base band molding filtration parameter after shifting processing, at least one subcarrier described is filtered Ripple, it is thus achieved that the first modulated sub-carriers；

Based on described spectral expansion coefficients, described first modulated sub-carriers is carried out spread spectrum, obtain described Two modulated sub-carriers；

Carry out data transmission based on described second modulated sub-carriers.

Method the most according to claim 1, it is characterised in that described based on described second modulation son load Ripple carries out data transmission, including:

The time domain data compression coefficient of described second modulated sub-carriers is determined according to described spectral expansion coefficients；

Based on described time domain data compression coefficient, described second modulated sub-carriers is carried out time domain data compression, obtain the 3rd tune Subcarriers；Described time domain data compression is for making the narrower intervals between described second modulated sub-carriers；

Carry out data transmission with described 3rd modulated sub-carriers.

Method the most according to claim 2, it is characterised in that described according to described spectral expansion coefficients Determine the time domain data compression coefficient of described second modulated sub-carriers, including:

Using the inverse of described spectral expansion coefficients and 1 sum as described time domain data compression coefficient.

Method the most according to claim 1, it is characterised in that described based on described in after shifting processing At least one subcarrier described is filtered by base band molding filtration parameter, it is thus achieved that the first modulated sub-carriers, bag Include:

Spreading coefficient is set for the frequency domain filtering parameter in described base band molding filtration, makes described base band molding filter The frequency response broadening of wave parameter；

At least one subcarrier described is carried out Fourier transformation, at least one subcarrier described is transformed to frequency Territory signal；

Based on the described base band molding filtration parameter after described spreading coefficient and shifting processing to described frequency-region signal It is filtered, filtered signal is carried out inversefouriertransform and obtains described first modulated sub-carriers.

Method the most according to claim 4, it is characterised in that described spectral expansion coefficients and described frequency Spectrum spreading coefficient positive correlation.

6. a wireless signal transceiver, described equipment includes: modulating unit, first determine unit, shifting Bit location, the first filter unit, expanding element and transmission unit, wherein:

Modulating unit, is used for modulates baseband signals to be transmitted at least one subcarrier；

First determines unit, at least one subcarrier described for being modulated with described baseband signal to be transmitted Determine base band molding filtration parameter and spectral expansion coefficients；

Shift unit, for carrying out time domain and frequency domain shifting processing to described base band molding filtration parameter；

First filter unit, for based on the described base band molding filtration parameter after shifting processing to described at least One subcarrier is filtered, it is thus achieved that the first modulated sub-carriers；

Expanding element, for carrying out frequency spectrum expansion based on described spectral expansion coefficients to described first modulated sub-carriers Exhibition, obtains described second modulated sub-carriers；

Transmission unit, for carrying out data transmission based on described second modulated sub-carriers.

Equipment the most according to claim 6, it is characterised in that described equipment also includes: second determines Unit and compression unit, wherein:

Second determines unit, for according to described spectral expansion coefficients determine described second modulated sub-carriers time Territory coefficient of compressibility；

Compression unit, for carrying out time domain pressure based on described time domain data compression coefficient to described second modulated sub-carriers Contracting, obtains the 3rd modulated sub-carriers；Described time domain data compression is between making between described second modulated sub-carriers Every narrowing；

Transmission unit, is additionally operable to carry out data transmission with described 3rd modulated sub-carriers.

Equipment the most according to claim 7, it is characterised in that described second determines unit, is additionally operable to Using the inverse of described spectral expansion coefficients and 1 sum as described time domain data compression coefficient.

Equipment the most according to claim 6, it is characterised in that described equipment also includes: arrange unit, First converter unit, the second filter unit and the second converter unit, wherein:

Unit is set, for based on the described base band molding filtration parameter after shifting processing to described at least one When individual subcarrier is filtered, spreading coefficient is set for the frequency domain filtering parameter in described base band molding filtration, Make the frequency response broadening of described base band molding filtration parameter；

First converter unit, at least one subcarrier described is carried out Fourier transformation, by described at least One sub-carrier transformation is frequency-region signal；

Second filter unit, the described base band molding filter after being additionally operable to based on described spreading coefficient and shifting processing Described frequency-region signal is filtered by wave parameter；

Second converter unit, is used for filtered signal being carried out inversefouriertransform and obtaining described first and adjust Subcarriers.

Equipment the most according to claim 9, it is characterised in that described spectral expansion coefficients is with described Spectral expansion coefficients positive correlation.