CN101364963B - Prefix channel data transmitting method and apparatus in frequency division multiplexing system - Google Patents
Prefix channel data transmitting method and apparatus in frequency division multiplexing system Download PDFInfo
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Abstract
The invention discloses a method for transmitting prefix channel data in a frequency division multiplexing system. The method comprises the following steps: firstly, the data to be transmitted of the prefix channel of each section is modulated into modulation symbols; then the modulation symbols of the identical prefix channel of the identical section are dispersively mapped on sub-carrier frequency resources; and finally, the modulation symbols of the prefix channels of the sections are transmitted after being mapped. The invention also discloses a device for transmitting prefix channel data in a frequency division multiplexing system. By adopting the technical proposal, the frequency diversity gain can be increased, and the ability of the system of overcoming the negative influence brought by the selective fading of the frequency can be further enhanced.
Description
Technical field
The present invention relates to Frequency Division Multiplexing system, relate in particular to the sending method and the dispensing device of prefix channel data in a kind of Frequency Division Multiplexing system.
Background technology
In OFDM (Orthogonal Frequency Division Multiplexing, OFDM) system, transmitting terminal is modulated to time-domain signal with data to be sent from frequency-region signal, then in channel, then carries out the inverse process demodulation at receiving terminal.The modulation and demodulation of ofdm system can be respectively by contrary DFT (Inverse Discrete Fourier Transform, IDFT) and DFT (Discrete Fourier Transform DFT) realizes.At transmitting terminal, through N point IDFT computing, be the frequency domain data sign reversing time domain data symbol, through after the carrier modulation, send in the channel; At receiving terminal, the signal that receives is carried out coherent demodulation, then baseband signal is carried out N point DFT computing, can obtain the data symbol of transmitting terminal.In practical application, IDFT/DFT can adopt contrary FFT (Inverse Fast Fourier Transform, IFFT) and FFT (Fast FourierTransform FFT) realizes.
In existing ofdm system, the forward channel of system is divided into superframe (superframe), each superframe is made up of a prefix frame (preamble) and 25 physical frames.The prefix frame comprises a plurality of forward direction prefix channels (taking 8 OFDM symbols altogether), is mainly used in and catches and broadcast system information.See also Fig. 1, it is the concrete structure sketch map of prefix frame in the prior art.
As can beappreciated from fig. 1, being mapped on the 0th the OFDM symbol is F-PBCCH (Forwardprimary broadcast control channel, the basic BCCH of forward direction) modulation symbol, and F-PBCCH is used for the basic broadcast control information of transmitting system; When superframe Index (superframe index) is odd number; Be mapped on the 1st to the 4th the OFDM symbol is F-SBCCH (Forward secondarybroadcast control channel; Forward direction second BCCH) modulation symbol, F-SBCCH is used to send second broadcast control information; When superframeIndex was even number, being mapped on the 1st to 4 the OFDM symbol was F-QPCH (Forward quick page channel, Forward Quick Paging Channel) modulation symbol, and F-QPCH is used to send Quick Paging information.Being mapped on the 5th the OFDM symbol is F-ACQCH (Forward Acquisition Channel, forward direction bid) modulation symbol, and F-ACQCH is mainly used in and catches and carry out system synchronization; Being mapped on the 6th and the 7th the OFDM symbol is F-OSICH (Forward other sector interference indication Channel, other sector interference channel of forward direction) modulation symbol, and F-OSICH is used to transmit other sector interference information.
In order to reduce the interference between adjacent sectors; In existing ofdm system, be provided with frequency reuse mode based on different Reuse Index (multiplexing index) parameter value for the prefix frame; Each adjacent sectors data is sent on different frequency resources, and said adjacent sectors number is generally determined by the system multiplexing factor.Under prefix frame rate multiplexer mode, each adjacent sectors Reuse Index value is different, and then the modulation symbol of the same channel of each adjacent sectors can be mapped to different frequency resource positions and send.
With F-PBCCH is example, and i the modulation symbol of F-PBCCH will be mapped to (the N that sequence number is 0 OFDM symbol
FFT/ 2-N
FFT, TDMPilot/ 2+ReuseIndex*N
FFT, TDMPilot/ 8+i) on the number of sub-carrier, wherein, N
FFTBe N point FFT, the sub-carrier number in the promptly whole bandwidth, N
FFT, TDMPilotFor sending the shared sub-carrier number of TDMPilot (time division multiplexed pilots) information.For example, the N of 5M system
FFTBe 512, N
FFT, TDMPilotAlso be all 512, the N of 10M system
FFTBe 1024, N
FFT, TDMPilotBe 512.There are 7 adjacent sectors in supposing the system, and is as shown in Figure 2 according to the F-PBCCH data map sketch map of above-mentioned mapping scheme formation so.Wherein, the Reuse Index=1 of first sector, the Reuse Index=2 of second sector, after this and the like, the Reuse Index=7 of the 7th sector.Label is that 1 time-frequency piece is specially the sub-carrier frequencies resource location that the F-PBCCH modulation symbol of first sector is shone upon among the figure; Label is that 2 time-frequency piece is specially the sub-carrier frequencies resource location that the F-PBCCH modulation symbol of second sector is shone upon, and all the other sectors in like manner.
5M (comprising 512 number of sub-carrier) system with comparatively commonly used is an example; The adjacent sectors number of supposing the system is 7; And the protection subcarrier that some is arranged, so, system is divided into 8 area segments (each area segments is included in 64 continuous on frequency domain number of sub-carrier) with 512 number of sub-carrier.If one of them area segments is as the protection subcarrier, so, remaining each area segments is used to send the F-PBCCH data of a sector at least.The inventor finds in realizing process of the present invention; The F-PBCCH data of each sector all are to be mapped on the area segments that comprises several continuous subcarriers to send in the prior art; Principle according to diversity gain; Frequency diversity gain in area segments on several continuous subcarriers is less, thus system to overcome the ability of the negative effect that frequency selective fading brings relatively poor.Other forward direction prefix channels in the prefix frame; Like F-SBCCH or F-QPCH etc.; The number that just takies the OFDM symbol is different with F-PBCCH; Be to be mapped to certain area segments that comprises several continuous subcarriers to send equally on frequency domain, therefore F-SBCCH data map sketch map as shown in Figure 3 also exists the frequency diversity gain problem of smaller.
Summary of the invention
The purpose of the embodiment of the invention is to provide the sending method and the dispensing device of prefix channel data in a kind of Frequency Division Multiplexing system, can improve frequency diversity gain, and then the raising system overcomes the ability of the negative effect that frequency selective fading brings.
The embodiment of the invention provides the sending method of prefix channel data in a kind of Frequency Division Multiplexing system: with the data-modulated to be sent of each sector prefix channel is modulation symbol; It is fast that each modulation symbol of each same prefix channel in different sectors is divided into a plurality of time-frequencies, adopts uniformly-spaced or the mode of random interval disperses to be mapped on the sub-carrier frequencies resource; The modulation symbol of each the sector prefix channel after the said mapping is sent.
The embodiment of the invention also provides the dispensing device of prefix channel data in a kind of ofdm system, comprising: modulating unit, and the data-modulated to be sent that is used for each sector prefix channel is a modulation symbol; Disperse map unit, be used for each modulation symbol of each same prefix channel in different sectors is divided into a plurality of time-frequency pieces, adopt uniformly-spaced or the mode of random interval disperses to be mapped on the sub-carrier frequencies resource; Transmitting element is used for the modulation symbol of each the sector prefix channel after the said mapping is sent.
Can find out through above technical scheme; The embodiment of the invention is sent after forward direction prefix channel data in the ofdm system is disperseed to be mapped to the sub-carrier frequencies resource; Rather than be mapped on the continuous a plurality of subcarriers in some area segments; Therefore strengthened frequency diversity gain, thereby the raising system overcomes the ability that frequency selective fading is brought negative effect.
Description of drawings
Fig. 1 is the concrete structure sketch map of prefix frame in the prior art;
Fig. 2 is a F-PBCCH data map sketch map in the prior art;
Fig. 3 is a F-SBCCH data map sketch map in the prior art;
Fig. 4 is the flow chart of data transmission method for uplink first embodiment in the ofdm system of the present invention;
Fig. 5 is the corresponding F-PBCCH modulation symbol mapping sketch map of first embodiment of the invention;
Fig. 6 is the flow chart of data transmission method for uplink second embodiment in the ofdm system of the present invention;
Fig. 7 is the corresponding F-PBCCH modulation symbol mapping sketch map of second embodiment of the invention;
Fig. 8 is the flow chart of data transmission method for uplink the 3rd embodiment in the ofdm system of the present invention;
Fig. 9 is the corresponding constant offset original position mapping sketch map of third embodiment of the invention;
Figure 10 is third embodiment of the invention corresponding random skew original position mapping sketch map;
Figure 11 is the flow chart of data transmission method for uplink the 4th embodiment in the ofdm system of the present invention;
Figure 12 is the corresponding F-SBCCH mapping sketch map of fourth embodiment of the invention;
Figure 13 is the structural representation of dispensing device embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing various embodiments of the present invention are elaborated.
See also Fig. 4, it is the flow chart of forward direction prefix channel data sending method first embodiment in the ofdm system of the present invention.
Step 110: with the data-modulated to be sent of each fan section forward prefix channel is modulation symbol.Because the concrete realization of this step can be referring to prior art, thereby no longer details.
Step 120: adopt equally spaced mode to disperse to be mapped on the sub-carrier frequencies resource modulation symbol of same sector same forward direction prefix channel.
For fear of the interference between adjacent sectors, each adjacent sectors modulation symbol need take different frequency resources and send, and said adjacent sectors number is generally determined by the system multiplexing factor.And then can think; If avoid the interference between adjacent sectors, then when carrying out the modulation symbol mapping, will satisfy the qualifications of a resource mapping: the sub-carrier frequencies resource that is mapped to the corresponding a plurality of sectors modulation symbol of system multiplexing number of factors is different.With regard to each sector, the modulation symbol of this sector a certain forward direction prefix channel is disperseed to be mapped on the sub-carrier frequencies resource with equally spaced mode.The dispersion mapping of so-called uniformly-spaced mode is meant that the modulation symbol of certain sector a certain forward direction prefix channel takies the subcarrier that there are fixed intervals each other in several, rather than takies several continuous sub-carriers (as shown in Figure 2) each other like prior art.Said fixed intervals, generally the multiplexing factor by system determines.
Step 130: the modulation symbol of each the fan section forward prefix channel after the said mapping is sent.The concrete process of transmitting of this step mainly comprises, through N point IDFT computing the data symbol of frequency domain is transformed to the data in time domain symbol, and existing conventional process such as carrier modulation, therefore no longer details.
The sending method of the invention described above first embodiment is applicable to multiple forward direction prefix channels such as including but not limited to F-PBCCH, F-SBCCH and F-QPCCH.Be example with F-PBCCH below, provide the F-PBCCH modulation symbol mapping sketch map that adopts the invention described above first embodiment.
See also Fig. 5, it is the corresponding F-PBCCH modulation symbol mapping sketch map of first embodiment of the invention.
One skilled in the art will appreciate that the F-PBCCH modulation symbol only need take an OFDM symbol (be like sequence number 0 OFDM symbol).In Fig. 5, label is that 1 time-frequency piece is the sub-carrier frequencies resource location of the first sector F-PBCCH modulation symbol mapping, and label is that 2 time-frequency piece is the sub-carrier frequencies resource location of the second sector F-PBCCH modulation symbol mapping, and all the other in like manner.Wherein, first sector is seven adjacent sectors in the system until the 7th sector, and the multiplexing factor of system is 7.No matter can find out, be that first sector or the F-PBCCH modulation symbol of the 7th sector all are mapped on the equally spaced subcarrier, because the multiplexing factor of system is 7, so the described interval of present embodiment is 7 number of sub-carrier.For example, to be mapped in sequence number be the 1st, the 8th of 0 OFDM symbol to the F-PBCCH modulation symbol of first sector ... on the n number of sub-carrier; It is the 2nd, the 9th of 0 OFDM symbol that the F-PBCCH modulation symbol of second sector is mapped in sequence number ... on the n+1 number of sub-carrier.
The mapping sketch map that provides through Fig. 5; Can clearerly find out; In first embodiment of the invention, the F-PBCCH modulation symbol of each sector is all equally spaced to be mapped on the sub-carrier frequencies resource, and the modulation symbol mapping position is intersected each other and staggered between each adjacent sectors.Can know according to the diversity gain principle; First embodiment of the invention is sent same signal through the bigger sub-carrier frequencies of a plurality of each intervals; Make that send data is dispersed on the frequency resource of whole system bandwidth full and uniformly; Existingly send, on frequency, can obtain bigger diversity gain, thereby improved the performance that system overcomes frequency selective fading through a plurality of continuous sub-carriers frequencies in certain area segments.
See also 6, it is the flow chart of data transmission method for uplink second embodiment in the ofdm system of the present invention.The main distinction of the present embodiment and first embodiment is concrete modulation symbol mapping step.Step 210 in the present embodiment, 230 successively with first embodiment in step 110,130 identical, so repeat no more, mainly introduce the step 220 in the present embodiment below.
Step 220: adopt the mode of random interval to disperse to be mapped on the sub-carrier frequencies resource modulation symbol of same sector same forward direction prefix channel, the sub-carrier frequencies resource that each adjacent sectors modulation symbol is mapped to is different.The mapping method of this step is applicable to multiple forward direction prefix channels such as including but not limited to F-PBCCH, F-SBCCH and F-QPCCH.
Find out the described random interval mapping mode of step 220 for vivider, please referring to Fig. 7, it is the corresponding F-PBCCH modulation symbol mapping sketch map of second embodiment of the invention.Can find out clearly that from Fig. 7 with regard to the F-PBCCH modulation symbol of certain sector, its interval that is mapped between a plurality of subcarriers on the sub-carrier frequencies resource is not changeless.F-PBCCH modulation symbol with first sector is an example, this sector F-PBCCH modulation symbol be mapped between a plurality of subcarriers on the sub-carrier frequencies resource between be separated with multiple, like 3 number of sub-carrier at interval, 8 number of sub-carrier etc. at interval.The F-PBCCH modulation symbol mapping situation of all the other sectors is similar, repeats no more.Can find out; Adopt the mode of random interval mapping can reach the purpose of same sector same forward direction prefix Channel Modulation symbol being disperseed to be mapped to the sub-carrier frequencies resource equally; With first embodiment only is uniformly-spaced to shine upon the difference of shining upon with random interval; Therefore according to the diversity gain principle, second embodiment has improved the diversity gain on the frequency equally, has strengthened the performance that system overcomes frequency selective fading.
Further; If the modulation symbol of same sector same forward direction prefix channel to be sent need take a plurality of OFDM symbols; So, for the effect of enhanced frequency diversity gain, can on the sub-carrier frequencies resource of different OFDM symbols, adopt different random interval modes.The F-SBCCH that takies 4 OFDM symbols with needs is an example; The interval that the F-SBCCH modulation symbol is mapped between a plurality of subcarriers on first OFDM symbol possibly be 5,7,2 successively ... subcarrier, and the interval that is mapped between a plurality of subcarriers of second OFDM symbol possibly be 3,6,7 successively ... subcarrier.
See also Fig. 8, it is the flow chart of data transmission method for uplink the 3rd embodiment in the ofdm system of the present invention.Delivery plan shown in the present embodiment is applicable to that mainly Channel Modulation symbol to be sent need take the situation of a plurality of OFDM symbols.Step 310 in the present embodiment, 330 successively with first embodiment in step 110,130 identical, so repeat no more, mainly introduce the step 320 in the present embodiment below.
Step 320: if the modulation symbol of said same sector same forward direction prefix channel need take a plurality of OFDM symbols; Then the modulation symbol with same sector same forward direction prefix channel adopts the mode of skew original position to be mapped on the subcarrier of a plurality of OFDM symbols; Wherein, the original position that is mapped on the sub-carrier frequencies resource of at least two OFDM symbols of said modulation symbol is different.Certainly, for fear of the interference between adjacent sectors, the sub-carrier frequencies resource that each adjacent sectors modulation symbol is mapped to is different.
Need to prove that the skew original position mode in the step 320 comprises constant offset original position mode and random offset original position mode.Below through two concrete Channel Modulation sign map sketch mapes, the mapping mode of above-mentioned two kinds of skew original positions is further specified.
See also Fig. 9, it is the corresponding constant offset original position mapping sketch map of third embodiment of the invention.In the present embodiment, the F-SBCCH that takies 4 OFDM symbols with needs is that example describes, and is equally applicable to F-QPCH certainly.In Fig. 9, label is that 1 time-frequency piece is the sub-carrier frequencies resource location of the first sector F-SBCCH modulation symbol mapping, and label is that 2 time-frequency piece is the position of second sector F-SBCCH mapping, after this and the like.As can be seen from the figure; In the corresponding sub-carrier frequencies resource of each OFDM symbol; The mapping position of the F-SBCCH modulation symbol of different sectors is arranged in order, and the mapping position of the F-SBCCH modulation symbol of each sector is the area segments that comprises several continuous subcarriers.Different with prior art is, with regard to the F-SBCCH modulation symbol of same sector, its original position that is mapped on the sub-carrier frequencies resource of the different OFDM symbol of sequence number is different.
The 3rd sector F-SBCCH modulation symbol Mapping Examples to provide among Fig. 9 specifies: it is that the original position of 1 OFDM symbol is the 129th number of sub-carrier that the F-SBCCH modulation symbol of the 3rd sector is mapped to sequence number; The original position that is mapped to sequence number and is 2 OFDM symbol is the 448th number of sub-carrier; The original position that is mapped to sequence number and is 3 OFDM symbol is the 65th number of sub-carrier, and the original position that is mapped to sequence number and is 4 OFDM symbol is the 1st number of sub-carrier.Need to prove that each original position that provides among Fig. 9 only is a kind of example, in practical application, is not limited thereto.Similar with the F-SBCCH modulation symbol mapping position of the 3rd sector, the F-SBCCH modulation symbol of all the other sectors be mapped to original position on the sub-carrier frequencies resource of the different OFDM symbol of sequence number also different, promptly exist each other and squint.
Need to prove; Though the original position that the F-SBCCH modulation symbol is mapped on the sub-carrier frequencies resource of the different OFDM symbol of sequence number among Fig. 9 is all different each other; But in practical application, be not limited thereto; Can also be to be mapped to the wherein original position difference of certain several (as two) OFDM symbol, and the original position of other OFDM symbols be identical.For example, the F-SBCCH modulation symbol of first sector be mapped to sequence number be 1 with sequence number be that the original position of 3 OFDM symbol all is the 1st number of sub-carrier, be mapped to sequence number and be 2 with sequence number be that the original position of 4 OFDM symbol all is the 65th number of sub-carrier.In addition; It can also be seen that from Fig. 9; Though adopt fixedly original position offset manner, the original position that is mapped on the sub-carrier frequencies resource of different OFDM symbols is different, and the adjacent position after the mapping between the F-SBCCH modulation symbol of different sectors concerns constant; For example; No matter on the sub-carrier frequencies resource of which OFDM symbol, the F-SBCCH modulation symbol of always second sector adjacent and the F-SBCCH modulation symbol of the 4th sector with the 3rd sector F-SBCCH modulation symbol, the mapping position neighbouring relations of other sector modulation symbols are also similar.
See also Figure 10, it is third embodiment of the invention corresponding random skew original position mapping sketch map.
Contrast Figure 10 and Fig. 9 can know that both something in commons are: the original position that the modulation symbol of same sector same forward direction prefix channel is mapped to the different OFDM symbol of sequence number is different, promptly has skew each other.Both difference parts are: the random fashion skew original position that Figure 10 adopts possibly change the neighbouring relations of the mapping position of different sectors modulation symbol; And the fixed form that Fig. 9 adopts skew original position, the neighbouring relations of the mapping position of different sectors modulation symbol generally can not change.
No matter be the mode that adopts the constant offset original position, or the mode of random offset original position the modulation symbol of same sector same forward direction prefix channel is disperseed to be mapped on the sub-carrier frequencies resource; All make the modulation symbol of same sector same forward direction prefix channel be mapped at least two original positions differences on the OFDM symbol; Existing relatively same Channel Modulation sign map is to all identical technology (like Fig. 3) of the original position on each OFDM symbol; Owing to data to be sent can be sent through a plurality of subcarriers that more disperse, therefore can obtain bigger frequency diversity gain.
Three specific embodiments that more than provide are in the practical application use that can also mutually combine.For example; The mapping mode of the skew original position that uniformly-spaced mapping mode that first embodiment provides and the 3rd embodiment provide; The modulation symbol of same forward direction prefix channel need take under the situation of a plurality of OFDM symbols in same sector, and use just can combine.Still be that example is elaborated below with F-SBCCH, but those skilled in the art will recognize that the technical scheme that is applicable to F-SBCCH is equally applicable to F-QPCH.
See also Figure 11, it is the flow chart of data transmission method for uplink the 4th embodiment in the ofdm system of the present invention.Present embodiment mainly is that use combines with first embodiment and the 3rd embodiment (mainly being constant offset original position scheme wherein).Step 410 in the present embodiment, 430 successively with first embodiment in step 110,130 identical, so repeat no more, mainly introduce the step 420 in the present embodiment below.
Step 420: adopt the mode that uniformly-spaced reaches the skew original position to disperse to be mapped on the sub-carrier frequencies resource modulation symbol of same sector same forward direction prefix channel.For fear of the interference between each adjacent sectors, the sub-carrier frequencies resource that each adjacent sectors modulation symbol is mapped to is different.
From single OFDM symbol, what adopt during mapping is the mode of shining upon of uniformly-spaced disperseing; From the relation between a plurality of OFDM symbols, the original position that is mapped on the sub-carrier frequencies resource of at least two OFDM symbols is different.Still be example with F-SBCCH below, this is elaborated.
See also Figure 12, it is the corresponding F-SBCCH mapping sketch map of fourth embodiment of the invention.Label is that 1 time-frequency piece is the sub-carrier frequencies resource location of first sector F-PBCCH modulation symbol mapping among the figure, and label is that 2 time-frequency piece is the sub-carrier frequencies resource location of the 7th sector F-PBCCH modulation symbol mapping, after this and the like.
F-SBCCH with first sector in scheming is mapped as example; The first sector F-SBCCH be mapped in sequence number be original position on 1 the OFDM symbol to be mapped in sequence number with it be that original position on 2 the OFDM symbol is different, being mapped in sequence number and being original position on 3 the OFDM symbol, to be mapped in sequence number with it be that original position on 4 the OFDM symbol is also different; The interval that the first sector F-SBCCH is mapped between a plurality of subcarriers on each OFDM symbol all is 6 number of sub-carrier.Can clearly find out thus,, can obtain bigger frequency diversity gain through will uniformly-spaced disperseing the use that combines of mapping mode and skew original position mapping mode.
Above-mentioned the 4th embodiment has provided the technical scheme that the constant offset original position is used in combination among first embodiment and the 3rd embodiment.In practical application; Do not get rid of situation with random offset original position scheme among first embodiment and the 3rd embodiment combines, second embodiment is used in combination with the 3rd embodiment yet; The concrete realization and the 4th embodiment of these several kinds of association schemes are similar, repeat no more.
First to fourth embodiment that more than provides all can use in a data transmission procedure, and for some data, like F-PBCCH, transmitting terminal generally need send repeatedly, therefore, can the thought of aforementioned dispersion mapping be extended to and repeatedly send data conditions.In this case, in the process of transmitting of homogeneous not, F-PBCCH modulation symbol to be sent is mapped to the diverse location on the sub-carrier frequencies resource.For example, when sending the F-PBCCH data for the first time, the F-PBCCH modulation symbol is mapped to first area segments sends (area segments that for example comprises the 1st to the 64th number of sub-carrier); When sending for the second time, said F-PBCCH modulation symbol is mapped to second area segments sends (area segments that for example comprises the 65th to the 128th number of sub-carrier); When sending for the third time, said F-PBCCH modulation symbol is mapped to the 3rd area segments sends (area segments that for example comprises the 129th to the 196th number of sub-carrier), after this can and the like.Can find out; Because being transmitting terminals, the F-PBCCH data that receiving terminal repeatedly receives pass through the transmission of different frequency resource; Therefore; The comprehensive F-PBCCH data that repeatedly receive can obtain bigger frequency diversity gain, thereby the raising system overcomes the performance of the negative effect that frequency selective fading brings.
More than provided a plurality of embodiment of the present invention; Need to prove; When no matter the modulation symbol of same sector same forward direction prefix channel being disperseed to shine upon through above-mentioned which embodiment; The sub-carrier frequencies resource that said dispersion is mapped to both possibly be a sub-carrier frequencies resource (being whole sub-carrier frequencies resource) whole in the system, also possibly be the available subcarrier frequency resource of removing outside the protection subcarrier (or frequency resource of other fixed-purpose).The scope no matter dispersion is shone upon is to whole sub-carrier frequencies resource; Or available subcarrier frequency resource; As long as can forward direction prefix channel data to be sent be sent through a plurality of sub-carrier frequencies of disperseing as far as possible, just can reach the purpose that improves frequency diversity gain.In addition, be the explanation that example is carried out though above-mentioned each embodiment all is Frequency Division Multiplexing systems with quadrature, one skilled in the art would recognize that do not get rid of yet with the embodiment of the invention use non-orthogonal Frequency Division Multiplexing system maybe.In addition; Because " forward direction " is just to a kind of custom appellation of base station side to the downlink data of user side; And do not have the branch of uplink and downlink for some special system, and then just do not have forward direction, reverse branch yet, so; It will be appreciated by those skilled in the art that various embodiments of the present invention are not limited to the prefix channel of " forward direction ".
One of ordinary skill in the art will appreciate that all or part of step that realizes among the said method embodiment is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer-readable recording medium; Described storage medium, as: ROM/RAM, magnetic disc, CD etc.
Please continue to consult Figure 13, it is the dispensing device example structure sketch map of forward direction prefix channel data in the ofdm system of the present invention.Dispensing device in the present embodiment comprises modulating unit 131, disperses map unit 132 and transmitting element 133.Below in conjunction with the operation principle of this dispensing device, further introduce its inner each part and inner annexation thereof.
When forward direction prefix channel data to be sent, be modulation symbol through modulating unit 131 with the data-modulated to be sent of each fan section forward prefix channel earlier; Then, through disperseing map unit 132 that the modulation symbol dispersion of same sector same forward direction prefix channel is mapped on the sub-carrier frequencies resource.If for fear of the interference between adjacent sectors, then the frequency resource that is mapped to of each adjacent sectors modulation symbol is different.And then transmitting element 133 will send through the modulation symbol of each the fan section forward prefix channel after disperseing map unit 132 mappings.Because modulating unit 131 can be achieved through existing related techniques with transmitting element 133, therefore no longer detail.
Need to prove that disperse map unit 132 when concrete the realization, kinds of schemes can be arranged, several kinds of main implementations of facing wherein down specifically describe.
For example; Disperseing map unit 132 can be uniformly-spaced to disperse map unit; Be used for adopting equally spaced mode to disperse to be mapped to the sub-carrier frequencies resource modulation symbol of same sector same forward direction prefix channel; Corresponding a kind of mapping sketch map is as shown in Figure 5, has carried out detailed description in front about the related notion that uniformly-spaced shines upon, so locate to repeat no more.
Again for example; Disperseing map unit 132 can also be that random interval is disperseed map unit; Be used for adopting the mode of random interval to disperse to be mapped to the sub-carrier frequencies resource modulation symbol of same sector same forward direction prefix channel, corresponding a kind of mapping sketch map is as shown in Figure 7.If said modulation symbol need take a plurality of OFDM symbols, then can adopt different random intervals to disperse map unit to different OFDM symbols.Random interval disperses map unit to realize through interleaver, if different OFDM symbols is adopted different interleavers, then can obtain bigger diversity gain.Certainly, also can adopt same interleaver to different OFDM symbols.Related notion about the random interval mapping has had detailed introduction at preamble, so locate to repeat no more.
Again for example; If the modulation symbol of same sector same forward direction prefix channel need take a plurality of OFDM symbols; Then disperseing map unit 132 can also be that start offset disperses map unit, is used for modulation symbol with same sector same forward direction prefix channel and adopts the mode of skew original position to be mapped to the sub-carrier frequencies resource of a plurality of OFDM symbols, wherein; The original position that said modulation symbol is mapped on the sub-carrier frequencies resource of two OFDM symbols at least is different, promptly has skew.Said start offset disperses map unit specifically can be achieved through two kinds of schemes again; First kind is that fixedly start offset disperses map unit; Adopt the mode of constant offset original position to carry out the modulation symbol mapping, corresponding a kind of mapping sketch map is as shown in Figure 9; Second kind is that start offset disperses map unit at random, adopts the mode of random offset original position to shine upon, and corresponding a kind of mapping sketch map is shown in figure 10.Related notion about constant offset original position and random offset original position has had detailed introduction at preamble, so locate to repeat no more.
In addition, disperse map unit 132 logically can also combine above-mentioned multiple concrete map unit to realize jointly.For example; Disperseing map unit 132 not only to comprise in logic uniformly-spaced disperses map unit but also comprises fixedly start offset dispersion map unit; And then; When modulation symbol is mapped to the sub-carrier frequencies resource, disperse map unit 132 can combine uniformly-spaced and the mode of constant offset original position, the modulation symbol of same sector same forward direction prefix channel is disperseed to be mapped on the sub-carrier frequencies resource; The concrete a kind of mapping sketch map that forms is shown in figure 12, can obtain bigger diversity gain.Certainly, disperse map unit 132 logically can also combine uniformly-spaced to disperse map unit and start offset at random to disperse map unit, or combine random interval to disperse map unit and start offset to disperse map unit (comprising fixedly start offset dispersion map unit and start offset dispersion map unit at random) to be achieved.
In addition, the data of some forward direction prefix channel need repeatedly to send, and F-PBCCH data for example then disperse the map unit 132 can be in the process of transmitting of homogeneous not, and the F-PBCCH modulation symbol of same sector is mapped to different subcarriers frequency resource position.Owing in process of transmitting repeatedly, same signal data is sent through the different subcarriers frequency resource, therefore can obtain bigger frequency diversity gain equally.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (9)
1. the sending method of prefix channel data in the Frequency Division Multiplexing system:
With the data-modulated to be sent of each sector prefix channel is modulation symbol;
Each modulation symbol of each same prefix channel in different sectors is divided into a plurality of time-frequency pieces, adopts uniformly-spaced or the mode of random interval disperses to be mapped on the different subcarriers frequency resource; If the modulation symbol of said each same prefix channel in different sectors need take a plurality of orthogonal frequency division multiplex OFDM symbols, the said random interval mode that then on the sub-carrier frequencies resource of different OFDM symbols, adopts is different;
The modulation symbol of each the sector prefix channel after the said mapping is sent.
2. method according to claim 1; It is characterized in that; If the modulation symbol of said each same prefix channel in different sectors need take a plurality of OFDM symbols, the then said step that the modulation symbol of each same prefix channel in different sectors is disperseed to be mapped on the sub-carrier frequencies resource comprises:
Adopt the mode of skew original position to be mapped on the sub-carrier resources of a plurality of OFDM symbols the modulation symbol of each same prefix channel in different sectors; Wherein, the original position that is mapped on the sub-carrier frequencies resource of at least two OFDM symbols of said modulation symbol is different.
3. method according to claim 2 is characterized in that, the mode of said skew original position is specially the mode of constant offset original position or the mode of random offset original position.
4. according to any described method in the claim 1 to 3; It is characterized in that; If the data of said prefix channel need be sent repeatedly, the then said step that the modulation symbol of each same prefix channel in different sectors is disperseed to be mapped on the sub-carrier frequencies resource comprises:
In the process of transmitting of homogeneous not, the modulation symbol of said prefix channel is mapped to the diverse location on the sub-carrier frequencies resource.
5. according to any described method in the claim 1 to 3, it is characterized in that the step that said modulation symbol with each same prefix channel in different sectors disperses to be mapped on the sub-carrier frequencies resource also comprises the qualifications that following resource is shone upon:
The sub-carrier frequencies resource that is mapped to the modulation symbol of the corresponding a plurality of sectors of system multiplexing number of factors is different.
6. method according to claim 1 is characterized in that, said prefix channel is specially the basic BCCH of forward direction or forward direction second BCCH or Forward Quick Paging Channel; Said Frequency Division Multiplexing system is specially ofdm system.
7. the dispensing device of prefix channel data in the ofdm system is characterized in that, comprising:
Modulating unit, the data-modulated to be sent that is used for each sector prefix channel is a modulation symbol;
Disperse map unit, be used for each modulation symbol of each same prefix channel in different sectors is divided into a plurality of time-frequency pieces, adopt uniformly-spaced or the mode of random interval disperses to be mapped on the different subcarriers frequency resource; If the modulation symbol of said each same prefix channel in different sectors need take a plurality of OFDM symbols, then adopt different random intervals to disperse map unit to different OFDM symbols;
Transmitting element is used for the modulation symbol of each the sector prefix channel after the said mapping is sent.
8. device according to claim 7; It is characterized in that; If the modulation symbol of said each same prefix channel in different sectors need take a plurality of OFDM symbols; Then said dispersion map unit comprises that start offset disperses map unit; Be used for adopting the mode of skew original position to be mapped to the sub-carrier frequencies resource of a plurality of OFDM symbols the modulation symbol of each same prefix channel in different sectors, wherein, the original position that said modulation symbol is mapped on the sub-carrier frequencies resource of two OFDM symbols at least is different.
9. device according to claim 7 is characterized in that, said prefix channel is specially the basic BCCH of forward direction or forward direction second BCCH or Forward Quick Paging Channel; Said Frequency Division Multiplexing system is specially ofdm system.
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| CN1633052A (en) * | 2003-12-22 | 2005-06-29 | 华为技术有限公司 | A method of signal transmission in OFDM system |
| CN1635725A (en) * | 2003-12-31 | 2005-07-06 | 华为技术有限公司 | A method for implementing synchronization in OFDM system |
| WO2005122458A1 (en) * | 2004-06-04 | 2005-12-22 | Qualcomm Incorporated | Coding and modulation for broadcast and multicast services in a wireless communication system |
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| CN1633052A (en) * | 2003-12-22 | 2005-06-29 | 华为技术有限公司 | A method of signal transmission in OFDM system |
| CN1635725A (en) * | 2003-12-31 | 2005-07-06 | 华为技术有限公司 | A method for implementing synchronization in OFDM system |
| WO2005122458A1 (en) * | 2004-06-04 | 2005-12-22 | Qualcomm Incorporated | Coding and modulation for broadcast and multicast services in a wireless communication system |
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