CN101102298B - Use method and system of partial bandwidth in multi-carrier transmission system - Google Patents

Use method and system of partial bandwidth in multi-carrier transmission system Download PDF

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Publication number
CN101102298B
CN101102298B CN2006100987201A CN200610098720A CN101102298B CN 101102298 B CN101102298 B CN 101102298B CN 2006100987201 A CN2006100987201 A CN 2006100987201A CN 200610098720 A CN200610098720 A CN 200610098720A CN 101102298 B CN101102298 B CN 101102298B
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sub
band
targeting sequencing
transmitting terminal
setting quantity
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CN101102298A (en
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戎军
吕林军
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XFusion Digital Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2007/070253 priority patent/WO2008014701A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

The method comprises: dividing the sub-band of multi carrier transmission system into preset amounts of continuous sub frequency bands; selecting the sub frequency band to be used from said sub frequency bands to insert into the leader sequence; transmitting the leader sequence and data on said selected sub frequency band inserted into the leader sequence. The system thereof comprises: send end used for dividing the sub-band of multi carrier transmission system into preset amounts of continuous sub frequency bands and selecting the sub frequency band from said sub frequency bands to insert into the leader sequence, and sending the leader frequency and data on the sub frequency band inserted into the leader frequency sequence.

Description

The using method of part bandwidth and system in the multicarrier transmission systems
Technical field
The present invention relates to network communication field, relate in particular to the using method and the system of part bandwidth in a kind of multicarrier transmission systems.
Background technology
OFDM (OFDM, orthogonal frequency division multiplexing) is a kind of modulation system of digital signal, is modulated with quadrature amplitude modulation or other method simultaneously by the subcarrier of one group of equidistant orthogonal arrangement after the signal packets.At present, be that the multi-carrier modulation wideband transmit technology of representative has been subjected to extensive concern with OFDM.Multi-carrier transmission is divided into several independently sub data flows to data flow, and each sub data flow will have much lower bit rate.Then, remove to modulate corresponding subcarrier, thereby constitute the transmission system of the parallel a plurality of low rate symbols that send with low bit rate multimode symbol.
OFDM is one of implementation of multi-carrier transmission scheme, and OFDM is also referred to as the Discrete Multitone modulation in asymmetric subscribers feeder (ADSL, asymmetric digital subscriber line) system.OFDM utilizes fast fourier transform that multichannel data is modulated on mutually orthogonal a plurality of sub-carrier set, a plurality of data flow of parallel again transmission, and above-mentioned a plurality of sub-carrier set constitute our a said subband.At receiving terminal a plurality of data flow of above-mentioned parallel transmission are carried out invert fast fourier transformation, thereby a plurality of data flow that just can send walking abreast decompose out the realization demodulation.
Ofdm system based on Fourier transform/invert fast fourier transformation is minimum, the most widely used a kind of multi-carrier transmission scheme of present implementation complexity.Compare with traditional single carrier and code division multiple access (CDMA, codedivision multiple access) system, the main advantage of ofdm system is:
1, can effectively resist the intersymbol interference that multipath transmisstion causes, and implementation complexity is lower relatively;
2, change on the relatively slow channel at time orientation, ofdm system can according to the noise of each subcarrier when disturbed condition come the information bit that transmits on each subcarrier of optimized distribution, thereby improve the capacity and the validity of system transmissions information;
3, can effectively resist narrow band interference, because this interference only influences the sub-fraction subcarrier, ofdm system is dispatching services on these subcarriers not;
4, in broadcasted application, ofdm system can be realized very attractive Single Frequency Network.
Because OFDM has above-mentioned multipath antagonism, and can be combined into flavor with other access way neatly, therefore, OFDM has been included in the multiple wired and wireless access standard such as ADSL, IEEE802.11a, 802.16d/e, HIPERLAN-2 and digital audio-video-frequency broadcast as core technology, and is received in the solution of 4G wireless communication system.
In recent years, in short supply day by day along with the fast development of wireless technology and universal frequency spectrum resource, distribute under the system in traditional fixed frequency spectrum, the frequency spectrum owner be not all regions and institute free all continuously use to the frequency spectrum of its distribution, so just having caused the use of frequency spectrum resource actual is very poor efficiency and waste.In order to address this problem, some frequency spectrum share strategies have appearred at present, such as, (the IEEE of IEEE, Institute for Electrical and Electronics Engineers) 802.22 exempts from licensing system radio area network (WRAN, wireless Radio Access Network) system, IEEE 802.16H system and WLAN (wireless local area network) (WLAN, Wireless Local AreaNetwork) system etc.
The above-mentioned feature of exempting from licensing system is that its working frequency range does not need to authorize.In working frequency range, these are exempted from, and licensing system needs and authoring system coexists and utilize the temporary transient idle frequency range of authoring system.Coexist such as WRAN system needs and Part74 wireless telecommunications systems such as authoring system wireless digital TV-set or wireless microphone.The work prerequisite of exempting from licensing system is to cause interference to the operate as normal of licensing system, and be present in certain its frequency range of using in case detect permission system, exempt from licensing system and must unconditionally withdraw from this frequency range, and jump on other frequency ranges that do not have licensed system to take and work on.This mode of operation, the just common spectrum pool system that says, permitted user (LU user, Licensed User) has the preferential right of using frequency spectrum, exempt from permitted user (also cry and lease the user, second user) and under the prerequisite that does not influence LU user, can use LU user's temporary transient idle frequency range.
In addition, when stating function in realization, LU user does not have obligation to detect the frequency spectrum operating position lease the user, leases the user and need bear that frequency spectrum operating position to LU user detects, institute is obligated to carry out that frequency range is dodged etc.
Early stage ofdm system is not the spectrum pool system, all is to take fixing frequency range such as digital audio-video-frequency broadcast, WLAN etc.At present, along with the increase of wireless application, cognitive radio technology has appearred in day being becoming tight of spectrum application resource, utilizes the cognitive radio technology can be flexible, effectively and reliably uses frequency spectrum resource.Below we briefly introduce WRAN system based on cognitive radio and OFDM.
The WRAN network is a kind of emerging network technology based on OFDM, can for remote districts, provide high bandwidth to cover on a large scale than low-density population area.The WRAN network is a kind of operation system of exempting to permit, the idle frequency band that uses cognitive radio technology to seek LU user communicates.Such as in the licensed band such as VHF/UHF of DTV, seeking does not have occupied frequency range to be used as the carrying frequency range of WRAN network.
At present, the WRAN system uses the OFDMA technology based on time division duplex (TDD, Time Division Duplex) to communicate, and its working sub-band is temporary transient idle television channel.The frame structure of WRAN system as shown in Figure 1, each frame structure is divided into two subframes: a descending sub frame and a sub-frame of uplink.Descending sub frame is followed a sub-frame of uplink through a transmitting-receiving switch protecting after the time.Sub-frame of uplink comprises range finding, bandwidth application (BW request), urgent coexistent notice (UCS Notification), and the upstream physical layer protocol Data Unit (PHY PDU, Physical LayerDevice Protocol Data Unit) that sends by different user terminals.Wherein ranging slot is used for timing offset and power correction, bandwidth application time slot is used for user terminal to base station (BS, base station) the request upstream bandwidth distributes, and the urgent coexistent announcement slot is used for the urgent coexistent situation of user terminal when the BS report detects LU user.In every frame the inside, insert a TTG protection time slot between from the descending sub frame to the sub-frame of uplink, the main effect of this time slot is that the radio frequency for BS can have the sufficient time to change reception into by transmission.Equally, a RTG protection time slot is arranged also between the descending sub frame for the sub-frame of uplink of present frame and next frame, this protection time slot mainly is the signal that can receive all user terminals in order to ensure BS.
The time-frequency structure schematic diagram of WRAN frame as shown in Figure 2.In existing OFDM technology, dispatch the distribution of all subcarriers by BS one side, BS can dynamically be terminal, traffic assignments subcarrier according to channel, disturbed condition, can distribute the upstream or downstream business equally on the subcarrier that does not have interference or deep fading.Along with 802.11,802.16 and based on the development of technology such as 802.22 of cognitive radio, the WRAN system will no longer be confined to consider how to avoid disturbing or the deep fading, whether further system need detect periphery electromagnetic environment, and find and discern the existence of other system and need and how to avoid these systems are produced pernicious interference.The most direct also is that the method for avoiding disturbing that adopts is at present extensively exempted from permitted user exactly and abdicated present located working frequency points (subband), but tends to cause frequency spectrum waste like this.Such as, other system is that frequency band that narrow-band user or both sides clash (shared) is the sub-fraction in the used subband.
A kind of avoiding the method for LU user's interference is in the prior art: permit ofdm system (such as the WRAN system) for general exempting from; when having LU user on the subband of finding its work at present; then this exempt to permit ofdm system abandon immediately this subband that is using and frequency hopping to other not by the subband of LU CU, thereby very simply, directly protected the LU custom system.The principle schematic of this method as shown in Figure 3.
The shortcoming of the method for above-mentioned prior art is: when the working frequency range of LU custom system does not always occupy whole when exempting from the working sub-band of licensing system just, the above-mentioned mode of directly abandoning subband often causes slatterning in the subband not by the portions of the spectrum of LU CU, thereby causes the reduction of the availability of frequency spectrum.In addition, the generation that this frequency spectrum switches often can not estimate that just the base station has been carried out frequency hopping but can't have been notified relevant terminal by explicitly, and terminal must be finished subband search and access procedure again before recovering operate as normal.Therefore, the frequency hopping mode of above-mentioned this method was both dumb, also can cause service disconnection and loss of data.
Another kind of avoiding the method for LU user's interference is in the prior art: the self adaptation OFDMA method of using based on the part bandwidth.This method is divided into the individual frequency sub-band of 8 (they also can be 6 or 7 according to the subband width) with the WRAN subband in frequency domain, and by using different frame preamble (Preamble) sequences to indicate ensuing OFDM frame to use which frequency sub-band.
The detailed technology scheme of this method is as follows: at an embodiment of this method: promptly the schematic diagram that cognitive radio users is used the part bandwidth in Digital Television subband as shown in Figure 4; have arrowband LU user in the Digital Television subband, the cognitive radio users of this WRAN system can be used remaining idle frequency sub-band under the prerequisite isolated by enough boundary belts and arrowband LU.The WRAN system can not occupy the subband that wireless digital TV-set occurs and adjoin subband.In addition, if wireless microphone appears in certain subband, the WRAN system must abdicate whole subbands, even if system can support above-mentioned part bandwidth using method.
Above-mentioned part bandwidth using method can be brought a lot of benefits to us.At first, traditional approach (just abandoning subband as long as LU occurs) the down component frequency resource of waste can be used effectively, and promptly the maximum throughput of system will be improved and a large amount of bandwidth can be distributed to each user.The schematic diagram that use to improve throughput of system by the part bandwidth as shown in Figure 5.Above-mentioned part bandwidth using method equally also is applicable to the transmission of point-to-multipoint.
Above-mentioned part bandwidth using method can also minimize the WRAN system to adjoining the interference of arrowband LU on the subband; reduce as shown in Figure 6 by part bandwidth using method the schematic diagram that adjoins arrowband LU user's interference on the subband; when arrowband LU appears at when adjoining subband; by using the part bandwidth and vacating enough boundary belts; WRAN can reduce to very little to the influence of the narrow band service on the adjacent sub-bands, and this is very helpful to arrowband LU user especially wireless microphone.(this scene can not dealt with problems by the part bandwidth fully, as long as BS not on corresponding boundary belt dispatching services just passable)
In addition, above-mentioned part bandwidth using method can also be used for explicit channel (subband) to be switched, and part bandwidth using method is used for schematic diagram that explicit channel switches as shown in Figure 7.When arrowband LU user occurred, except the part bandwidth that need use, the WRAN system can abandon/remove the signal transmitting and receiving on other subcarrier on the whole TV subband.Then, system will finish the information transmission that explicit channel switches by the rest parts bandwidth.Like this, the WRAN system can significantly reduce the interference of arrowband LU system in the channel transfer time (in the WRAN demand＜2 seconds), and this method also can be used in the occasion that wireless microphone occurs.
In above-mentioned part bandwidth using method, the minimum particle size of part bandwidth (resolving accuracy) is 1MHz, just can partly use 1,2,3,4,5,6,7 or the bandwidth of 8MHz on a subband.Available sub-carrier number direct ratio and part bandwidth.For list band situation (corresponding many subbands binding and polymerization), no matter whether use the part bandwidth, employed sample frequency all is the same, so subcarrier spacing and fft block size can not change.
The pattern that the part bandwidth is used is to determine by different preamble.Beginning frequency (subcarrier) position that the corresponding respectively part bandwidth of various part bandwidth is used always has beginning frequency location schematic diagram that 8 kinds of part bandwidth and 8 kinds of part bandwidth thereof use as shown in Figure 8.In Fig. 8, starting position 8 is the situation of 1MHz for the part bandwidth, uses for the part bandwidth of 1MHz, and starting position 1-8 can be as the beginning frequency of bandwidth use.Yet, to use for the part bandwidth of 2MHz, the frequency starting position just can only be 7 positions of removing the starting position 1～7 of position 8.In like manner, when the part bandwidth was 8MHz, the starting position is remaining position 1 only just.Therefore, to use pattern will be 36 kinds of patterns shown in black region among Fig. 9 for total part bandwidth.The choosing of sequence depended on bandwidth and the frequency starting position that the part bandwidth is used.
Avoid in the above-mentioned prior art the shortcoming of the method for LU user's interference be: this method is only supported limited portion bandwidth occupation mode (36 kinds).For the situation that a bandwidth is divided into 8 one's share of expenses for a joint undertaking bands, disturb the kind number of existing way to be Σ i = 1 8 C 8 i = 2 8 Kind, therefore, the flexibility that the part bandwidth in this method is used is very limited.Problem for arrowband LU interference avoidance, when as shown in figure 10 arrowband LU occurring and be positioned at the centre of subband (6MHz bandwidth) or the scene of arrowband LU of a plurality of different frequent points occurs occurring on as shown in figure 11 the subband, this method can't be made the most of the advantage, and system still can abandon too many bandwidth because of the arrowband LU appearance of minority.
In addition; though this method has been used the part bandwidth; but still need on whole subcarriers of used subband, send Preamble sequence (have the parton carrier wave and can also have uniformly-spaced zero insertion in zero filling and the sequence) as boundary belt; therefore; in fact in the Preamble of each frame sequence in launch time; the BS of WRAN can launch the Preamble sequence on the frequency range that LU is working, bring very important interference so just for arrowband LU system.
If the frame period of the BS of WRAN is 20ms, the Preamble sequence that this method sends on the frequency range that LU is working can to LU (as wireless microphone) system bring low frequency (50Hz) " drone " background noise, the interference waveform that this method is brought to wireless microphone is as shown in figure 12.And more can bring periodic packet loss/mistake bag for digital LU system, this method cause the comparison serious disturbance can for arrowband LU system in a word.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the using method and the system that the purpose of this invention is to provide part bandwidth in a kind of multicarrier transmission systems, thereby can be so that exempting from permitted user and can share same subband in the multicarrier transmission systems, and reduce interference to permitted user with permitted user as far as possible.
The objective of the invention is to be achieved through the following technical solutions:
The using method of part bandwidth in a kind of multicarrier transmission systems comprises step:
A, be the sub-band of continuous setting quantity with the sub-band division of multicarrier transmission systems;
Insert targeting sequencing on the sub-band of B, selection use in the sub-band of described setting quantity, and send targeting sequencing and data on the sub-band that has inserted targeting sequencing, so that the receiving terminal of system is determined the sub-band information that the transmitting terminal selection of described system is used according to described targeting sequencing.
The sub-band of described setting quantity is wide or not wide.
Described step B specifically comprises:
Insert a targeting sequencing on the sub-band that the transmitting terminal of system each in the sub-band of described setting quantity is selected to use, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
Described step B specifically comprises:
The sub-band that the transmitting terminal of system uses the selection in the sub-band of described setting quantity carries out segmentation, inserts the targeting sequencing of a correspondence on each sub-band after the segmentation, and sends targeting sequencing and data on the sub-band that has inserted targeting sequencing.
Described step B also comprises:
The receiving terminal of system according to the judgement sequence and the judging threshold that are provided with, is discerned the targeting sequencing that receives after receiving the targeting sequencing that the transmitting terminal of described system sends, and the transmitting terminal of determining described system is selected the sub-band information used.
Described step B also comprises:
Do not carry out the emission of targeting sequencing, pilot tone and business datum on the sub-band that the transmitting terminal of system does not have to use in the sub-band of described setting quantity.
Described multicarrier transmission systems comprises: orthogonal frequency division multiplex OFDM system.
The using system of part bandwidth in a kind of multicarrier transmission systems comprises:
Transmitting terminal: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, insert targeting sequencing on the sub-band of in the sub-band of described setting quantity, selecting to use, and send targeting sequencing and data on the sub-band that has inserted targeting sequencing, so that the receiving terminal of system is determined the sub-band information that the transmitting terminal selection of described system is used according to described targeting sequencing.
Also comprise:
Receiving terminal: after receiving the targeting sequencing of described transmitting terminal transmission,, the targeting sequencing that receives is discerned, determined the sub-band information that described transmitting terminal selection is used according to the judgement sequence and the judging threshold that are provided with.
Described transmitting terminal specifically comprises: the sub-band division module: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, and the sub-band information of dividing is passed to sending module;
Sending module: in the sub-band information that described sub-band division module passes over, need to select the sub-band of use, on the sub-band of selecting, insert targeting sequencing, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
As seen from the above technical solution provided by the invention, the present invention is the sub-band of continuous setting quantity by the sub-band division with system, on the sub-band that will use, insert targeting sequencing, and inserting transmission targeting sequencing and data on the leading sub-band.Compare with prior art, have following advantage:
1, make the permitted user system that exempts from system's (such as ofdm system) of multi-carrier transmission to share same subband (such as TV band), and can closely measure the interference of minimizing with some LU (such as the Part74 of arrowband work, wireless microphone etc.) system to permitted user.
2, increase the usable spectrum of WRAN system, with the shared television channel of LU system (subband) rather than abdicate whole subband, make the optional frequency spectrum of WRAN system increase to some extent.
3, increase the flexibility that system spectrum is used, the combination of part bandwidth use flexibly is provided.
Even 4 under relatively poor signal to noise ratio environment, system still can provide enough part bandwidth to use the identification capability of pattern by long sequence related operation.
5, under the urgent coexistent situation, BS can utilize the part bandwidth mode to carry out LU and detect recovery and its part bandwidth use pattern of notice receiving terminal, can reduce service disconnection and loss of throughput when the urgent coexistent situation occurring.
Description of drawings
Fig. 1 is based on the WRAN frame structure schematic diagram of TDD in the prior art;
Fig. 2 is the time-frequency structure schematic diagram of WRAN frame in the prior art;
Fig. 3 is a kind of principle schematic of avoiding the method for LU user's interference in the prior art;
Fig. 4 in the prior art in the TV subband CR user use the schematic diagram of part bandwidth;
Fig. 5 uses the schematic diagram that improves throughput of system by the part bandwidth in the prior art;
Fig. 6 is for reducing adjoining the schematic diagram of arrowband LU user's interference on the subband by part bandwidth using method in the prior art;
Fig. 7 is used for the schematic diagram that explicit channel switches for part bandwidth using method in the prior art;
Fig. 8 is 8 kinds of part bandwidth and 8 kinds of beginning frequency location schematic diagrames that the part bandwidth is used thereof in the prior art;
Fig. 9 is that the part bandwidth of 8 kinds of part bandwidth in the prior art is used pattern diagram;
Figure 10 is positioned at the scene schematic diagram of the centre of subband (6MHz bandwidth) for arrowband LU;
Figure 11 is the scene schematic diagram that occurs the arrowband LU of a plurality of different frequent points on the subband;
The interference waveform schematic diagram that Figure 12 brings to wireless microphone for the self adaptation OFDMA scheme of using based on the part bandwidth of the prior art;
Figure 13 is the concrete process chart of the embodiment of the method for the invention;
Figure 14 is the schematic diagram of Fractional Preamble inserted mode of the present invention;
Figure 15 is the schematic diagram of complete leading inserted mode of the present invention;
Figure 16 is the structural representation of the part bandwidth mode discriminating gear of receiving terminal of the present invention;
Figure 17 is the schematic diagram of the relevant court verdict sequence that obtains at receiving terminal among the embodiment of the present invention;
Figure 18 is in embodiment of the present invention, the schematic diagram of the physical frame time-frequency structure when using in conjunction with channel (subband) binding situation lower part bandwidth;
Figure 19 is the structural representation of the embodiment of system of the present invention.
Embodiment
The invention provides the using method and the system of part bandwidth in a kind of multicarrier transmission systems, core of the present invention is: be the sub-band of continuous setting quantity with the sub-band division of multicarrier transmission systems, on the sub-band that will use, insert targeting sequencing, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
Describe the method for the invention in detail below in conjunction with accompanying drawing, the method for the invention is applicable to multicarrier transmission systems (such as ofdm system).With the ofdm system is example, and the concrete handling process of the embodiment of the method for the invention comprises the steps: as shown in figure 13
Step 13-1, be the sub-band of continuous setting quantity with the OFDM sub-band division.
It is the sub-band of continuous setting quantity that the present invention at first needs the OFDM sub-band division, sets the concrete numeral of quantity and decide according to actual conditions, and sub-bands of these setting quantity can be wide, also can be not wide.
Insert targeting sequencing on the residue sub-band that the transmitting terminal of step 13-2, system is selected to use in the system outside the sub-band that is taken by LU, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
In the sub-band of above-mentioned setting quantity, on the residue sub-band outside the sub-band that is taken by LU, select need to determine the sub-band of use, then, the transmitting terminal of system has inserted the pseudo random sequence of leading effect on these sub-bands of selecting to use, the inserted mode of these pseudo random sequences comprises: segmentation inserted mode and complete inserted mode.
The processing method of segmentation inserted mode is: insert a pseudorandom PN sequence that plays leading effect at this on each sub-band that select to use, these PN sequences can be identical also can be different.The schematic diagram of Fractional Preamble inserted mode as shown in figure 14.
The processing method of complete inserted mode is: be that granularity is divided into the frequency range (may not be continuous) that will use and the frequency range that will abandon using with subband with the frequency sub-band on frequency, on the frequency band that will use, insert the pseudorandom PN sequence that play leading effect of one or more length greater than frequency sub-band, these PN sequences can be identical also can be different.The schematic diagram of complete leading inserted mode as shown in figure 15.
The relatively long PN targeting sequencing of above-mentioned complete insertion can provide the frequency deviation and the timing estimation precision of better synchronizing process for system receiving terminal as ofdm system synchronous (comprising that carrier wave, symbol and sample value are synchronous) and channel estimating.
The transmitting terminal of system after selecting to have inserted leading PN sequence on the residue sub-band that uses, sends targeting sequencing and data by above-mentioned segmentation inserted mode or complete inserted mode on the sub-band that has inserted leading PN sequence.The leading PN sequence of above-mentioned each sub-frequency bands will be synthesized a final OFDM targeting sequencing.
On not inserting the sub-band of leading PN sequence, other does not carry out the emission of any leading, pilot tone, data etc.These sub-bands that do not insert leading PN sequence comprise the sub-band of that taken by LU and necessary protection subcarrier.
Step 13-3, above-mentioned targeting sequencing is discerned, determined that the part bandwidth of the transmitting terminal of system is used pattern at the receiving terminal of system.
Receiving terminal in system is discerned above-mentioned targeting sequencing, checks whether the locational PN sequence of corresponding frequency sub-band exists, and then the part bandwidth of definite system is used pattern.Whether above-mentioned inspection PN sequence exists can be by carrying out related operation at frequency domain to the leading symbol that receives after the OFDM demodulation, and the result of corresponding relevant peaks position and default thresholding compared finish.
The structural representation of the part bandwidth mode discriminating gear of receiving terminal as shown in figure 16, the course of work to this device is described below:
If the OFDM sub-carrier number of M sub-frequency bands correspondence is respectively Ni, i=1 wherein, 2 ..., M;
Transmitting terminal BS inserts a pseudo random sequence PNi who plays leading effect at this on each sub-band of selecting to use, and the value of the setting quantity of the sub-band of the corresponding above-mentioned division of i then on this subband by the synthetic leading symbol of a plurality of Fractional Preamble sequence PNi is:
x ( n ) = η 1 P N 1 , n ∈ [ 1 , N 1 ] η 2 PN 2 , n ∈ [ N 1 + 1 , N 1 + N 2 ] . . . . . . η M PN M , n ∈ [ 1 + Σ i = 1 M - 1 N i , N i ] , η when not using sub-band wherein i=0, otherwise equal 1;
If choose different segmentation PN sequences, then should satisfy quadrature between the sequence PNi as far as possible, this identification separating capacity to receiving terminal is considerable.
The reception leading symbol that obtains that receiving terminal finishes after the OFDM demodulation is:
R (n)=x (n)+v (n), wherein v (n) is a white noise;
Pre-defined and the preservation differentiation aligned sequences at receiving terminal: p ( n ) = Σ i = 1 M PN i , When each PNi is not isometric, then in the zero padding of corresponding PN afterbody up to isometric with the longest PN.
According to above-mentioned reception leading symbol and differentiation aligned sequences, the relevant court verdict sequence that obtains at receiving terminal is:
I ( n ) = Σ i = 1 N + 2 N m - 1 r ( i ) p ( n + i ) , R (n) sequence has been carried out the zero padding operation at two ends in the formula.
If do not contain any Fractional Preamble sequence in the received signal, then above-mentioned relevant court verdict sequence all is a white noise.Otherwise, as long as contain a Fractional Preamble in the received signal, in the relevant position of above-mentioned correlated results sequence correlation peak will appear.Therefore, just can from the correlated results sequence, use which sub-band by the identification transmitting terminal by preestablishing certain threshold value, then, these sub-bands enterprising row decoding of receiving terminal in follow-up OFDM symbol and work such as read.
The invention allows for an embodiment of the described method of the invention described above.In this embodiment, the 3rd, 4 frequency sub-band in 8 of transmitting terminal BS frequency sub-band need be taken by the LU system.So on transmitting terminal BS, adopt above-mentioned segmentation inserted mode, on the 1st, 2,5,6,7,8 frequency sub-band, insert targeting sequencing PN, and inserting transmission targeting sequencing and data on the 1st, 2,5,6,7,8 frequency sub-band of targeting sequencing PN.
After the receiving terminal of system received the targeting sequencing that the transmitting terminal of described system sends, according to the judgement sequence and the judging threshold that are provided with, the schematic diagram of the above-mentioned relevant court verdict sequence of acquisition as shown in figure 17.Correlation peak do not occur as can be seen from Figure 17 on 3,4 corresponding positions of sub-band, receiving terminal can judge that the part bandwidth use pattern that transmitting terminal BS adopts is 1,2,5,6,7,8 thus.
The schematic diagram of the physical frame time-frequency structure when using in conjunction with channel (subband) binding situation lower part bandwidth in this embodiment, as shown in figure 18.Can see that on the sub-band 4 of second subband, BS does not carry out any scheduling in order to get out of the way the LU system.
Describe system of the present invention in detail below in conjunction with accompanying drawing, in the multicarrier transmission systems of the present invention the structural representation of the embodiment of the using system of part bandwidth as shown in figure 19, this system comprises: transmitting terminal and receiving terminal.
Transmitting terminal: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, insert targeting sequencing on the sub-band of in the sub-band of described setting quantity, selecting to use, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.Transmitting terminal comprises: sub-band division module and sending module.
Wherein, the sub-band division module: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, and the sub-band information of dividing is passed to sending module;
Wherein, sending module: in the sub-band information that described sub-band division module passes over, need to select the sub-band of use, on the sub-band of selecting, insert targeting sequencing, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
Receiving terminal: after receiving the targeting sequencing of described transmitting terminal transmission,, the targeting sequencing that receives is discerned, determined the sub-band information that described transmitting terminal selection is used according to the judgement sequence and the judging threshold that are provided with.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (10)

1. the using method of part bandwidth in the multicarrier transmission systems is characterized in that, comprises step:
A, be the sub-band of continuous setting quantity with the sub-band division of multicarrier transmission systems;
Insert targeting sequencing on the sub-band of B, selection use in the sub-band of described setting quantity, and send targeting sequencing and data on the sub-band that has inserted targeting sequencing, so that the receiving terminal of system is determined the sub-band information that the transmitting terminal selection of described system is used according to described targeting sequencing.
2. method according to claim 1 is characterized in that, the sub-band of described setting quantity is wide or not wide.
3. method according to claim 1 is characterized in that, described step B specifically comprises:
Insert a targeting sequencing on the sub-band that the transmitting terminal of system each in the sub-band of described setting quantity is selected to use, and only on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
4. method according to claim 1 is characterized in that, described step B specifically comprises:
The sub-band that the transmitting terminal of system uses the selection in the sub-band of described setting quantity carries out segmentation, inserts the targeting sequencing of a correspondence on each sub-band after the segmentation, and sends targeting sequencing and data on the sub-band that has inserted targeting sequencing.
5. according to claim 3 or 4 described methods, it is characterized in that described step B also comprises:
The receiving terminal of system according to the judgement sequence and the judging threshold that are provided with, is discerned the targeting sequencing that receives after receiving the targeting sequencing that the transmitting terminal of described system sends, and the transmitting terminal of determining described system is selected the sub-band information used.
6. according to claim 3 or 4 described methods, it is characterized in that described step B also comprises:
Do not carry out the emission of targeting sequencing, pilot tone and business datum on the sub-band that the transmitting terminal of system does not have to use in the sub-band of described setting quantity.
7. method according to claim 1 is characterized in that described multicarrier transmission systems comprises: orthogonal frequency division multiplex OFDM system.
8. the using system of part bandwidth in the multicarrier transmission systems is characterized in that, comprising:
Transmitting terminal: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, insert targeting sequencing on the sub-band of in the sub-band of described setting quantity, selecting to use, and send targeting sequencing and data on the sub-band that has inserted targeting sequencing, so that the receiving terminal of system is determined the sub-band information that the transmitting terminal selection of described system is used according to described targeting sequencing.
9. system according to claim 8 is characterized in that, also comprises:
Receiving terminal: after receiving the targeting sequencing of described transmitting terminal transmission,, the targeting sequencing that receives is discerned, determined the sub-band information that described transmitting terminal selection is used according to the judgement sequence and the judging threshold that are provided with.
10. according to Claim 8 or 9 described systems, it is characterized in that, described transmitting terminal specifically comprises: the sub-band division module: with the sub-band division of multicarrier transmission systems is the sub-band of continuous setting quantity, and the sub-band information of dividing is passed to sending module;
Sending module: in the sub-band information that described sub-band division module passes over, need to select the sub-band of use, on the sub-band of selecting, insert targeting sequencing, and on the sub-band that has inserted targeting sequencing, send targeting sequencing and data.
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