CN103595677B - The generation method and device of beacon signal in communication system - Google Patents

Abstract

The invention discloses the generation method and apparatus of beacon signal in a kind of communication system.Specifically include: frequency domain synchronization signal generation module generates a length of L × N according to the transmission mode of communication system_IFrequency domain synchronization signal, wherein N_ISubband number shared by the spectrum mode that signal to be sent uses, L is the effective subcarrier number carried on each subband of beacon signal；Mapping block carries out subcarrier mapping to described frequency domain synchronization signal afterwards；Frequency domain symbol after the mapping of described subcarrier is carried out inverse Fourier transform and obtains Domain Synchronous signal by inverse Fourier transform module again；Described Domain Synchronous signal is carried out repeating to obtain time domain beacon signal with splicing by last Domain Synchronous signal processing module.Utilize the present invention, the signal peak-to-average power power ratio in communication system can be reduced, improve communication quality.

Description

The generation method and device of beacon signal in communication system

Technical field

The present invention relates to communications processing field, particularly relate to the beacon signal in a kind of communication system Generation method and apparatus.

Background technology

In Modern Communication System, peak-to-average power ratio (PAPR, the Peak to Average of signal of communication Power Ratio) refer to the power of signal peak and the ratio of mean power.Peak-to-average power ratio is impact One important factor of communication quality.

Especially, based on Multicarrier Transmission Technology, such as OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology, communication system in, it will usually exist higher Peak-to-average power ratio, thus the efficiency and quality to communication system causes large effect.

Orthogonal frequency division multiplexi obtains the most widely should in audio droadcasting system such as at present With, but a major defect based on orthogonal FDM communication system is height power ratio, system Output signal power fluctuation range is very big, and this requires the power amplifier in system, digital to analog converter etc. Parts have sufficiently large dynamic range, otherwise inevitably result in the poor efficiency of these parts；The most once The dynamic range of these parts can not reach requirement, then can cause the clipping distortion sending signal, system Communication quality declines.Therefore, the suppression to the peak-to-average power ratio in communication system is requisite.

Beacon signal is not in digital communication system is such as the physical layer frame structure of digital audio broadcasting signal The part that can lack, it refers to segment signal when each subframe initiates, can be fast with auxiliary reception machine Speed effective deadline and Frequency Synchronization.In a communications system, generally will pending delivering letters after modulation Number inserting and to constitute logical frame after beacon signal, logical frame forms physical layer signal again after subframe is distributed Frame, then launch after base band to rf conversion.

Current communication system, in China Mobile multimedia broadcasting (CMMB) system, is used Beacon signal generation method in frequency-domain sync sequence mainly use straight binary pseudorandom PN sequence, generator polynomial is x¹¹+x⁹+1.But, this beacon signal is to the peak in communication system All inhibitory action of power ratio are the most weak, cause signal peak-to-average power power higher, and communication quality is relatively Low.

Summary of the invention

In view of this, the generation side of beacon signal in a kind of communication system of offer is provided Method and device, to reduce the signal peak-to-average power power ratio in communication system, improve communication quality.

The technical scheme is that and be achieved in that:

A kind of generation method of beacon signal in communication system, the method includes:

Transmission mode according to communication system generates a length of L × N_IFrequency domain synchronization signal, wherein N_IFor treating Sending the subband number shared by spectrum mode that signal uses, L is to carry on each subband of beacon signal Effectively subcarrier number；

Described frequency domain synchronization signal is carried out subcarrier mapping；

Frequency domain symbol after being mapped by described subcarrier carries out inverse Fourier transform and obtains Domain Synchronous signal；

Carry out Domain Synchronous signal repeating to obtain time domain beacon signal with splicing.

Preferably, the described transmission mode according to communication system generates a length of L × N_IFrequency domain synchronization signal Method particularly includes:

The transmission mode used according to communication system, (1) generates a length of L × N according to the following equation_IFrequency Territory synchronizing signal:

$P_b\left(n\right)=\exp [-j{(-1)}^{n}2\mathrm{\πq}\frac{n(n+1)2}{\mathrm{Nzc}}]---\left(1\right)$

N=0,1 in described formula (1) ..., L × N_I-1, Mzc are the parameter relevant to described transmission mode with q.

Preferably, described communication system is digital audio broadcast system, and described transmission mode is that DAB is wide First transmission mode of broadcast system and the 3rd transmission mode, described Nzc=967, described q=48, described L=120。

Preferably, described communication system is digital audio broadcast system, and described transmission mode is that DAB is wide Second transmission mode of broadcast system, described Nzc=487, described q=12, described L=60.

Preferably, described frequency domain synchronization signal is carried out subcarrier mapping, specifically includes:

The spectrum mode index information used according to communication system finds current all effective subband positions, will Described a length of L × N_IFrequency domain synchronization signal be sequentially filled effective son of time domain synchronizing signal from left to right On carrier index position, wherein the 1st element is filled into the effective of Domain Synchronous channel distortion experienced index minimum On subcarrier, wherein virtual subnet carrier wave is filled to 0, thus obtains the frequency domain symbol after subcarrier maps.

Preferably, described described subcarrier is mapped after frequency domain symbol carry out inverse Fourier transform and obtain time domain Synchronizing signal, specifically includes:

Frequency domain symbol X after utilizing following formula (2) that described subcarrier is mapped_bCarry out inverse Fourier transform Obtain Domain Synchronous signal S_b(t):

$S_b\left(t\right)=\frac{1}{N_b}\underset{i=-N_b/2}{\overset{N_b/2-1}{\mathrm{\Σ}}}{X}_b\left(i\right)e^{j2\mathrm{\πi}{\left(\mathrm{\Δf}\right)}_{b}t},0\≤t\≤T_b---\left(\text{2}\right)$

In above-mentioned formula (2), described N_bFor Domain Synchronous signal total subcarrier number, described X_b(i) be time The i-th subcarrier of territory synchronizing signal, described (Δ f)_bFor the subcarrier spacing of Domain Synchronous signal, described T_bFor The time span of Domain Synchronous signal.

Preferably, described being carried out by Domain Synchronous signal repeats to obtain time domain beacon signal with splicing, tool Body includes:

Described Domain Synchronous signal is repeated twice, adds in the front end of these two the Domain Synchronous signals repeated Cyclic Prefix, as protection, obtains time domain beacon signal.

The generating means of beacon signal in a kind of communication system, this device includes:

Frequency domain synchronization signal generation module, generates a length of L × N for the transmission mode according to communication system_I Frequency domain synchronization signal, wherein N_ISubband number shared by the spectrum mode that signal to be sent uses, L For the effective subcarrier number carried on each subband of beacon signal；

Mapping block, for carrying out subcarrier mapping to described frequency domain synchronization signal；

Inverse Fourier transform module, the frequency domain symbol after being mapped by described subcarrier carries out Fourier's inversion Get time domain synchronizing signal in return；

Domain Synchronous signal processing module, obtains for described Domain Synchronous signal carries out repetition and splicing To time domain beacon signal.

Preferably, described frequency domain synchronization signal generation module specifically for:

The transmission mode used according to communication system, (1) generates a length of L × N according to the following equation_IFrequency Territory synchronizing signal:

$P_b\left(n\right)=\exp [-j{(-1)}^{n}2\mathrm{\πq}\frac{n(n+1)2}{\mathrm{Nzc}}]---\left(1\right)$

N=0,1 in described formula (1) ..., L × N_I-1, Nzc are the parameter relevant to described transmission mode with q.

Preferably, described communication system is digital audio broadcast system；

When the first transmission mode that described transmission mode is digital audio broadcast system and three transmission modes, Described Nzc=967, described q=48, described L=120；

When the second transmission mode that described transmission mode is digital audio broadcast system, described Nzc=487, Described q=12, described L=60.

Compared with prior art, the present invention generates a length of L × N according to the transmission mode of communication system_ISpy Different frequency domain synchronization signal, carries out subcarrier mapping to described frequency domain synchronization signal afterwards, then by described subcarrier Frequency domain symbol after mapping carries out inverse Fourier transform and obtains Domain Synchronous signal, finally by Domain Synchronous signal Carry out repeating to obtain time domain beacon signal with splicing.The present invention can be according to different transmission modes to institute The generation parameter stating frequency domain synchronization signal is adjusted, such that it is able to effectively reduce the peak-to-average power ratio of signal, Reduce and send the signal requirement to parts such as the power amplifier in communication system, digital to analog converters, thus change The communication quality of kind communication system.

Accompanying drawing explanation

Fig. 1 is a kind of flow chart of the generation method of beacon signal in communication system of the present invention；

Fig. 2 is the physical layer frame structure figure in OFDM digital audio broadcast system；

Fig. 3 be the generating means of beacon signal in communication system of the present invention a kind of composition and Position view in a communications system；

Fig. 4 is the schematic diagram that a kind of frequency domain synchronization channel distortion experienced maps；

The structural representation of the time domain beacon signal that Fig. 5 is generated by the present invention；

Fig. 6 is the assist in synchronization FB(flow block) of the beacon signal that a kind of receiver generates based on the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawings and specific embodiment the present invention is further described in more detail.

Fig. 1 is a kind of flow chart of the generation method of beacon signal in communication system of the present invention.See Fig. 1, the method includes:

101, a length of L × N is generated according to the transmission mode of communication system_IFrequency domain synchronization signal, wherein N_I Subband number shared by the spectrum mode that signal to be sent uses, L is to take on each subband of beacon signal Effective subcarrier number of band, this L is the parameter relevant to transmission mode.

102, described frequency domain synchronization signal is carried out subcarrier mapping；Will map by described frequency domain synchronization signal On effective subcarrier of time domain synchronizing signal.

103, the frequency domain symbol after being mapped by described subcarrier carries out inverse Fourier transform and obtains Domain Synchronous letter Number.

104, carry out Domain Synchronous signal repeating and splicing obtains time domain beacon signal.

The communication system that the present invention is suitable for can be the communication system that any employing beacon signal carries out synchronizing System, include, but are not limited to: use OFDM audio droadcasting system, use OFDM DVB-T, The digit broadcasting systems such as DRM, HD-Radio and CMMB, asymmetrical DSL (ADSL) communication system, digital audio broadcasting (DAB) system of etsi standard, fine definition TV (HDTV) broadcast system, wireless lan (wlan) communication system, and other are non- The communication system etc. of the Multicarrier Transmission Technology of OFDM.

In embodiments of the invention as a example by OFDM digital audio broadcast system, beacon therein is believed Number generation method illustrate.

Fig. 2 is the physical layer frame structure figure in OFDM digital audio broadcast system.See Fig. 2, often Individual physical layer signal frame includes that the subframe of 4 a length of 160ms, each subframe include 1 beacon (i.e. Beacon signal, referred to as beacon) and S_NIndividual OFDM symbol.Each physical layer signal frame carries one and patrols Collect the data of frame.Described beacon signal is tied in the physical layer frame of digital communication system such as digital audio broadcasting signal Being an indispensable part in structure, it refers to segment signal when each subframe initiates, can be with auxiliary reception Machine deadline fast and effectively and Frequency Synchronization.In logical frame framing procedure, it is necessary first to generate beacon Signal.

Fig. 3 be the generating means of beacon signal in communication system of the present invention a kind of composition and Position view in communication system.Seeing Fig. 3, the generating means 300 of this beacon signal includes:

Frequency domain synchronization signal generation module 301, for performing the step 101 in described method, i.e. according to logical The transmission mode of communication system generates a length of L × N_IFrequency domain synchronization signal, wherein N_IAdopt for signal to be sent The subband number shared by spectrum mode, L is the effective subcarrier carried on each subband of beacon signal Number, this L is the parameter relevant to transmission mode.

Mapping block 302, for performing the step 102 in described method, i.e. to described frequency domain synchronization signal The frequency domain synchronization signal that generation module 301 generates carries out subcarrier mapping.

Inverse Fourier transform module 303, for performing the step 103 in described method, will be through described Frequency domain symbol after the mapping of mapping block 302 subcarrier carries out inverse Fourier transform and obtains Domain Synchronous signal.

Domain Synchronous signal processing module 304, for performing the step 104 in described method, will be described Domain Synchronous signal carries out repeating to obtain time domain beacon signal with splicing.This time domain beacon signal is exactly this Invention needs the beacon signal generated.

Signal of communication to be sent is modulated into OFDM symbol by described data OFDM modulation module 305 exactly Number.The described time domain beacon signal of described Domain Synchronous signal processing module 304 output will be inserted into described The front end of OFDM symbol, thus constitute subframe, subframe forms physical layer signal again after subframe is distributed Frame, then after base band to rf conversion, carry out radio-frequency transmissions.

During the generation of described beacon signal is described in detail below, the concrete methods of realizing of each step.

First, in a step 101, the transmission mode used according to digital audio broadcast system, according to Following formula (1) generates a length of L × N_IFrequency domain synchronization signal:

$P_b\left(n\right)=\exp [-j{(-1)}^{n}2\mathrm{\πq}\frac{n(n+1)2}{\mathrm{Nzc}}]---\left(1\right)$

Wherein N_ISubband number shared by the spectrum mode that signal to be sent uses, L is that beacon signal is every The effective subcarrier number carried on individual subband；N=0,1 in described formula (1) ..., L × N_I-1, Nzc and q For the parameter relevant to described transmission mode.

Introduce above-mentioned each determination method for parameter separately below.

For L, need to determine according to transmission mode.Described transmission mode refers to transmission ginseng in communication system The set of number, such as number of carrier wave, OFDM symbol length etc..Such as in digital audio broadcast system, can To be divided into three kinds of transmission modes, wherein the first transmission mode is transmission mode 1, and the second transmission mode is transmission Pattern 2, the 3rd transmission mode is transmission mode 3, and the systematic parameter of every kind of transmission mode is as shown in table 1 below:

Table 1

In the present invention, described L will be determined, then first it needs to be determined that presently used transmission mode, then root According to the value of the L being described in table 2 below with the relation of transmission mode to determine L:

Transmission mode 1	Transmission mode 2	Transmission mode 3
			120	60	120

Table 2

That is: during currently used transmission mode 1 and 3, L=120；During currently used transmission mode 2, L=60.

For N_I, use the subband number shared by spectrum mode for signal to be sent, it is therefore desirable to according to The spectrum mode that current demand signal uses determines.In OFDM digital audio broadcast system, DAB is wide Broadcast a width of 100kHz of name band of subband, for a kind of segmentation of digital audio broadcasting signal frequency spectrum.Numeral sound Frequently broadcast singal is made up of most 8 nominal subbands with a width of 100kHz.If table 3 below is that DAB is wide Broadcast spectrum mode and the corresponding table of subband position that signal allows to use, wherein the block table of white in spectrum mode Show that the frequency spectrum not taken, diagonal line hatches block represent the lower half subband of an effective subband, horizontal line shaded block table Show that the frequency band that simulation table takies, every pair of diagonal line hatches block form a subband with vertical line shaded block.DAB Broadcast singal defines two class spectrum modes, i.e. A class spectrum mode and B class spectrum mode.Wherein A class frequency Spectral model each subband nominal frequency is ± (i × 100+50) kHz, i=0,1,2,3(A class spectrum mode in RED sector Frequency band is reserved) for analog broadcast signal；B class spectrum mode each subband nominal frequency is the integer of 100kHz Times, i.e. ± i*100kHz, i=0,1,2,3.Different spectrum modes provides different bandwidth combinations and to existing The compatibility of analog broadcast signal.

Table 3 lists spectrum mode, the spectrum mode index of its correspondence and corresponding N_IValue.Above-mentioned public affairs NI value described in formula (1) can be searched according in the spectrum mode that signal to be sent is used to table 3 Obtain.

Table 3

For Nzc and q in described formula (1), it is also desirable to determine according to current transmission mode.? During transmission mode 1 and 3 of digital audio broadcasting signal, Nzc=967, q=48, when transmission mode 2 Nzc=487, q=12.By combining parameter Nzc needed for concrete application in the present invention, and choose suitably Parameter q, so that this frequency domain sequence obtained through formula (1) is through Fourier transformation then The time-domain signal obtained after territory has the lowest peak-to-average power ratio.

It follows that in described step 102, by described frequency domain synchronization signal P_bN () is mapped to Domain Synchronous signal Effective subcarrier on.Specifically include: the spectrum mode index letter used according to digital audio broadcasting signal Breath, the most described table 3, finds current all effective subband positions；Then comparison such as following table 41 and table 42 will be long Degree is L × N_IFrequency-domain sync sequence P_bN () is sequentially filled the effectively son of time domain synchronizing signal from left to right and carries On ripple index position, the 1st element is filled into effective subcarrier that Domain Synchronous channel distortion experienced index is minimum On, wherein virtual subnet carrier wave is filled to 0, thus obtains frequency domain symbol X_b.Such as Fig. 4 is that a kind of frequency domain is same The schematic diagram that step channel distortion experienced maps.In this Fig. 4, it is to index 1, as a example by transmission mode 1 with spectrum mode Frequency domain synchronization channel distortion experienced map signal.

Table 4 below 1 is the sub-carrier indices table of B class spectrum mode synchronizing signal, and table 42 is Table A class frequency spectrum mould The sub-carrier indices table of formula synchronizing signal.

Table 41

Table 42

It follows that in step 103, specifically include: utilize following formula (2) that described subcarrier is mapped After frequency domain symbol X_bCarry out inverse Fourier transform and obtain Domain Synchronous signal S_b(t):

$S_b\left(t\right)=\frac{1}{N_b}\underset{i=-N_b/2}{\overset{N_b/2-1}{\mathrm{\Σ}}}{X}_b\left(i\right)e^{j2\mathrm{\πi}{\left(\mathrm{\Δf}\right)}_{b}t},0\≤t\≤T_b---\left(\text{2}\right)$

In above-mentioned formula (2), described N_bFor Domain Synchronous signal total subcarrier number, described X_b(i) be time The i-th subcarrier of territory synchronizing signal, described (Δ f)_bFor the subcarrier spacing of Domain Synchronous signal, described T_bFor The time span of Domain Synchronous signal.

Wherein, described T_b、N_b(Δ f)_bConcrete value relevant with transmission mode, its concrete value and biography The relation of defeated pattern such as table 5 below, can inquire described parameter according to current transmission mode from table 5 below Value.

Parameter	Transmission mode 1	Transmission mode 2	Transmission mode 3
				Tb(ms)	1.255(1024T)	0.627(512T)	1.255(1024T)
Nb	1024	512	1024
				(Δf)b(Hz)	796.875	1593.75	796.875

Table 5

Finally, at step 104, described by Domain Synchronous signal S_bT () carries out repeating to obtain with splicing Time domain beacon signal.Such as the structural representation that Fig. 5 is time domain beacon signal.Seeing Fig. 5, this step 105 has Body includes: by described Domain Synchronous signal S_bT () is repeated twice, at these two the Domain Synchronous signals repeated S_bT the front end interpolation Cyclic Prefix of (), as protection, obtains time domain beacon signal.In Fig. 5, described T_BcpFor following The length of ring prefix, T_uIt is two Domain Synchronous signal S repeated_bThe length of (t), T_BFor final time domain beacon The entire length of signal.

After generating described time domain beacon signal, as shown in Figures 2 and 3, by described time domain beacon signal Insert the front end of the OFDM symbol to be sent that described data OFDM modulation module 305 is modulated into, from And constituting subframe, subframe forms physical layer signal frame again after subframe is distributed, then becomes through base band to radio frequency Radio-frequency transmissions is carried out after changing.

At the signal receiver end of communication system, the time domain beacon signal utilizing described transmitting terminal to send is needed to enter Row assist in synchronization.Fig. 6 is the assist in synchronization flow chart element of the beacon signal that a kind of receiver generates based on the present invention Figure.Specifically include:

First, radiofrequency signal is changed into baseband signal by receiver；

Then, in step 601, receiver utilizes time domain beacon signal described in digital audio broadcasting signal (as shown in Figure 5) two the identical Domain Synchronous signal S comprised_bT the feature of (), completes subframe head Search with synchronization, i.e. search out two identical Domain Synchronous signal S_bT () is it is determined that be subframe Head；

Then, in step 602, receiver is by Domain Synchronous signal S_bT () carries out Fourier transformation and recovers The frequency domain symbol X sent_b；

Then, in step 603 and 604, from the frequency domain symbol X recovered_bIn extract frequency domain synchronization Signal P_bN (), utilizes the P that generation method of the present invention is generated_bN good auto-correlation that () sequence has and Cross correlation thus complete the sampled point synchronized tracking of Frequency Synchronization and digital audio broadcasting signal；

Finally, carry out digital audio and video signals data demodulation, until completing reception process.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap Within being contained in the scope of protection of the invention.

Claims (8)

1. the generation method of beacon signal in a communication system, it is characterised in that the method includes:

Transmission mode according to communication system generates a length of L × N_IFrequency domain synchronization signal, wherein N_IFor treating Sending the subband number shared by spectrum mode that signal uses, L is to carry on each subband of beacon signal Effectively subcarrier number；

Described frequency domain synchronization signal is carried out subcarrier mapping；

Frequency domain symbol after being mapped by described subcarrier carries out inverse Fourier transform and obtains Domain Synchronous signal；

Carry out Domain Synchronous signal repeating to obtain time domain beacon signal with splicing；

Wherein, the described transmission mode according to communication system generates a length of L × N_IFrequency domain synchronization signal Method particularly includes:

The transmission mode used according to communication system, (1) generates a length of L × N according to the following equation_IFrequency Territory synchronizing signal:

$P_b\left(n\right)=\exp \[-j{(-1)}^{n}2\mathrm{\π}q\frac{n(n+1)/2}{Nzc}\]---\left(1\right)$

N=0,1 in described formula (1) ..., L × N_I-1, Nzc are the parameter relevant to described transmission mode with q.

Method the most according to claim 1, it is characterised in that described communication system is DAB Broadcast system, described transmission mode is the first transmission mode and the 3rd transmission mould of digital audio broadcast system Formula, described Nzc=967, described q=48, described L=120.

Method the most according to claim 1, it is characterised in that described communication system is DAB Broadcast system, described transmission mode is the second transmission mode of digital audio broadcast system, described Nzc=487, Described q=12, described L=60.

Method the most according to claim 1, it is characterised in that described frequency domain synchronization signal is carried out Subcarrier maps, and specifically includes:

The spectrum mode index information used according to communication system finds current all effective subband positions, will Described a length of L × N_IFrequency domain synchronization signal be sequentially filled effective son of time domain synchronizing signal from left to right On carrier index position, wherein the 1st element is filled into the effective of Domain Synchronous channel distortion experienced index minimum On subcarrier, wherein virtual subnet carrier wave is filled to 0, thus obtains the frequency domain symbol after subcarrier maps.

Method the most according to claim 1, it is characterised in that described by after the mapping of described subcarrier Frequency domain symbol carry out inverse Fourier transform and obtain Domain Synchronous signal, specifically include:

Frequency domain symbol X after utilizing following formula (2) that described subcarrier is mapped_bCarry out inverse Fourier transform Obtain Domain Synchronous signal S_b(t):

$S_b\left(t\right)=\frac{1}{N_b}\underset{i=-N_b/2}{\overset{N_b/2-1}{\Σ}}{X}_b\left(i\right)e^{j2\mathrm{\π}i{\left(\mathrm{\Δ}f\right)}_{b}t},0\≤t\≤T_b---\left(2\right)$

In above-mentioned formula (2), described N_bFor Domain Synchronous signal total subcarrier number, described X_b(i) be time The i-th subcarrier of territory synchronizing signal, described (Δ f)_bFor the subcarrier spacing of Domain Synchronous signal, described T_bFor The time span of Domain Synchronous signal.

Method the most according to claim 1, it is characterised in that described Domain Synchronous signal is carried out Repeat and splicing obtain time domain beacon signal, specifically include:

Described Domain Synchronous signal is repeated twice, adds in the front end of these two the Domain Synchronous signals repeated Cyclic Prefix, as protection, obtains time domain beacon signal.

7. the generating means of beacon signal in a communication system, it is characterised in that this device includes:

Frequency domain synchronization signal generation module, generates a length of L × N for the transmission mode according to communication system_I Frequency domain synchronization signal, wherein N_ISubband number shared by the spectrum mode that signal to be sent uses, L For the effective subcarrier number carried on each subband of beacon signal；

Mapping block, for carrying out subcarrier mapping to described frequency domain synchronization signal；

Inverse Fourier transform module, the frequency domain symbol after being mapped by described subcarrier carries out Fourier's inversion Get time domain synchronizing signal in return；

Domain Synchronous signal processing module, obtains for described Domain Synchronous signal carries out repetition and splicing To time domain beacon signal；

Wherein, described frequency domain synchronization signal generation module specifically for:

The transmission mode used according to communication system, (1) generates a length of L × N according to the following equation_IFrequency Territory synchronizing signal:

$P_b\left(n\right)=\exp \[-j{(-1)}^{n}2\mathrm{\π}q\frac{n(n+1)/2}{Nzc}\]---\left(1\right)$

N=0,1 in described formula (1) ..., L × N_I-1, Nzc are the parameter relevant to described transmission mode with q.

Device the most according to claim 7, it is characterised in that described communication system is DAB Broadcast system；

When the first transmission mode that described transmission mode is digital audio broadcast system and three transmission modes, Described Nzc=967, described q=48, described L=120；

When the second transmission mode that described transmission mode is digital audio broadcast system, described Nzc=487, Described q=12, described L=60.