CN102307074B - Communication system - Google Patents
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- CN102307074B CN102307074B CN201110221377.6A CN201110221377A CN102307074B CN 102307074 B CN102307074 B CN 102307074B CN 201110221377 A CN201110221377 A CN 201110221377A CN 102307074 B CN102307074 B CN 102307074B
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Abstract
The invention provides a communication system comprising a sending device and a receiving device, wherein the sending device uses two-dimensional extended codes extending in a time direction and a frequency direction to send signals, and the receiving device is used for receiving the signals sent by the sending device; the sending device comprises a selection unit and a sending unit; the selection unit is used for selecting mutually-orthogonal extended codes in at least one direction of the time direction and the frequency direction; and the sending unit uses the selected extended codes to extend the signals and sends the signals, the extended codes can be segmented into more than two parts respectively, and the more than two parts are mutually orthogonal to the same part of the other selected extended codes in the at least one direction of the time direction and the frequency direction.
Description
The application is that original bill application number is 200480044600.2 application for a patent for invention (international application no: PCT/JP2004/018661, the applying date: on December 14th, 2004, denomination of invention: extended code allocating method, contrary extended method, dispensing device, receiving system, communicator, radio base station apparatus and mobile terminal apparatus) divisional application.
Technical field
The present invention relates to use the two-dimensional expansion code of expanding in time orientation and frequency direction to carry out the technology of the data transmit-receive of channel unit.
Background technology
In recent years at moving communicating field, as multi-carrier modulation, for example combined OFDM(Orthogonal Frequency Division Multiplexing, OFDM) modulation system and CDMA(Code Division Multiple Access, code division multiple access access) the OFDM-CDMA mode of mode receives publicity.OFDM modulation system is to use the high modulation system of efficiency of frequency employment of orthogonal multiple subcarriers, and CDMA mode is to use the modulation system of the spread spectrum communication mode of strong interference immunity.The OFDM-CDMA mode that has combined these two kinds of modes is used the two-dimensional expansion code of the expansion that can carry out time orientation and frequency direction, carrys out at least one party in expansion time direction and frequency direction.About this mode, be for example recorded in patent documentation 1,2.
In mobile communication, the state in transmission path changes along with situation.If transmission path state deteriorating causes transmission characteristic to worsen or power system capacity reduces.In the prior art described in patent documentation 1, in order to suppress the deterioration of transmission characteristic or the reduction of power system capacity, corresponding to the state in transmission path, in the rate of spread of transmitter side setting-up time direction and frequency direction.The for example maximum delay time on transmission path is longer to be set littlely by the rate of spread of frequency direction, has suppressed the deterioration of the orthogonality between extended code.In addition, maximum Doppler (Doppler) frequency on transmission path is higher to be set the rate of spread of time orientation littlely, has suppressed the deterioration of the orthogonality between extended code.
In the prior art described in patent documentation 1, when inferring pilot frequency code element (pilot symbol) of use etc. at transmitter side transmitting channel, according to the state of transmission path, each user (receiver side) is applied to the different rates of spread, or multiple users are applied to the identical rate of spread.
In a kind of front method, need the several extended codes of user, cause the capacity of entire system to diminish.Thereby reduced the utilization ratio of power system capacity.And need to the corresponding electric power of number of users, so that power consumption also becomes is large.
On the other hand, in a kind of rear method, each user utilizes the identical rate of spread to carry out contrary expansion, so can relatively suppress power consumption.But each user's receiving feature is due to transmission path state separately and therefore difference will directly determine that the best rate of spread is very difficult to each user.Thereby think and focus on when maintaining the high utilization ratio of power system capacity, multiple users can be utilized corresponding to the rate of spread of transmission path state separately and receive data.
Patent documentation 1: TOHKEMY 2003-46474 communique
Patent documentation 2: TOHKEMY 2004-48117 communique
Summary of the invention
The object of the present invention is to provide a kind of technology, this technology can be in the communication mode that the such use two-dimensional expansion code of OFDM-CDMA mode is expanded, when maintaining the high utilization ratio of power system capacity, multiple users can be utilized corresponding to the rate of spread of transmission path state separately and receive data.
Communication system of the present invention comprises dispensing device and receiving system, this dispensing device is used at the two-dimensional expansion code of time orientation and frequency direction expansion and is carried out transmitted signal, this receiving system receives the described signal sending from described dispensing device, it is characterized in that, described dispensing device has: selected cell, and it is chosen in orthogonal extended code at least one direction in described time orientation and described frequency direction; And transmitting element, it utilizes selected described extended code to expand signal, and send this signal, selected described extended code can be divided into plural part, in each part at least one direction in described time orientation and described frequency direction, there is the rate of spread less than the rate of spread of each selected extended code, and in each part at least one direction in described time orientation and described frequency direction, orthogonal with selected other extended code.
In addition, be preferably divided into two above part described extended code at least one direction in described time orientation and described frequency direction, there is the rate of spread less than the former rate of spread respectively.
In the present invention, when at least one party in time orientation and frequency direction is carried out to contrary expansion with the former rate of spread in orthogonal and at least one direction in described time orientation and frequency direction when being less than the rate of spread of the described former rate of spread and carrying out contrary expansion also orthogonal two-dimensional expansion code as alternative, from the extended code as alternative, determine to distribute to the extended code of each channel.Owing to carrying out the expansion of the code element of channel by the extended code of distributing like this, therefore at receiver side, can utilize all the time multiple rates of spread to carry out the contrary expansion to this code element.Can realize thus and can select the environment that more suitably rate of spread is carried out contrary expansion according to transmission path state.
The code element receiving can utilize multiple rates of spread to carry out contrary expansion, and therefore multiple users (receiving system) can carry out selecting based on carrying out this contrary rate of spread of expanding the result obtaining from a channel.Except carrying out result that contrary expansion obtains, be conceived to affect other factors of transmission path state, such as receiver side also can dynamically carry out the appropriate selection (comprising renewal) of the rate of spread at any time with respect to the translational speed of code element transmitter side etc.Can utilize thus for transmission path state the more suitably rate of spread to carry out contrary expansion, and can maintain all the time high power system capacity utilization ratio.By the transmission path state notifying of confirming at receiver side or infer to transmitter side and transmission path state is reflected to point mixing of extended code, can distribute more reliably extended code more suitable for the state of the transmission path to receiver side.Therefore, carrying out against expanding the result obtaining is that receiving feature can maintain on high level more reliably all the time.
Accompanying drawing explanation
Fig. 1 is the figure in the code territory of the two-dimensional expansion code of explanation present embodiment employing.
Fig. 2 A is the figure (situations of SF1 × 4) that a part of method is taken out in explanation from two-dimensional expansion code.
Fig. 2 B is the figure (situations of SF4 × 4) that a part of method is taken out in explanation from two-dimensional expansion code.
Fig. 2 C is the figure (situations of SF2 × 2) that a part of method is taken out in explanation from two-dimensional expansion code.
Fig. 3 is the figure of the distribution method of the two-dimensional expansion code of explanation present embodiment.
Fig. 4 is when two-dimensional expansion code has been described two channel allocation, becomes the figure of the two-dimensional expansion code of the object of distributing to other channels.
Fig. 5 is when two-dimensional expansion code has been described three channel allocation, becomes the figure of the two-dimensional expansion code of the object of distributing to other channels.
Fig. 6 is the figure of the structure of the communicator of explanation the first execution mode.
Fig. 7 is the figure of the structure of explanation extended code generating unit and two-dimensional expansion portion.
Fig. 8 be the content example of explanation extended code allocation table figure (one of).
Fig. 9 is the figure (two) of the content example of explanation extended code allocation table.
Figure 10 is the figure of the relation in the code territory occupied of the two-dimensional expansion code of channel in the extended code allocation table shown in key diagram 8 and the distribution object that becomes this channel.
Figure 11 is that extended code allocation table generates the flow chart of processing.
Figure 12 is the figure that the structure of the communicator communicating with the communicator shown in Fig. 6 is described.
Figure 13 is the figure of the pilot tone shown in explanation Figure 12 against the structure of extension.
Figure 14 is the figure of the renewal unit of the explanation rate of spread.
Figure 15 illustrates the figure shifting between the rate of spread of the renewal of following the rate of spread.
Figure 16 is the figure of the structure of the communicator of explanation the second execution mode.
Figure 17 is the figure that the structure of the communicator communicating with the communicator shown in Figure 16 is described.
Figure 18 is the figure of the structure of the communicator of explanation the 3rd execution mode.
Figure 19 is the figure of the structure of the communicator of explanation the 4th execution mode.
Figure 20 is the figure of the structure of the dispensing device of explanation the 5th execution mode.
Figure 21 is the figure of the structure of the dispensing device of explanation the 6th execution mode.
Figure 22 A is the figure (situation of SF4 × 1) that the rate of spread in explanation the 6th execution mode is distributed example.
Figure 22 B is the figure (situations of SF2 × 2) that the rate of spread in explanation the 6th execution mode is distributed example.
Figure 22 C is the situation that the rate of spread in explanation the 6th execution mode is distributed the figure (SFN × 4(N=1,2,4) of example).
Figure 23 is the figure of the structure of the dispensing device of explanation the 7th execution mode.
Embodiment
Below, the execution mode that present invention will be described in detail with reference to the accompanying.
< the first execution mode >
Fig. 1 is the figure in the code territory of the two-dimensional expansion code of explanation present embodiment employing.
This yard of territory is to make largest extension rate in time orientation and frequency direction, be 16 situation.Even if adopting, extended code in time orientation and frequency direction, all utilize the rate of spread different from the former rate of spread (rate of spread of transmitter side for expanding) to carry out contrary expansion or orthogonal extended code.This extended code can be used OVSF(Orthogonal Variable Spreading Factor, orthogonal variable spreading factor) code generation.Before the explanation of carrying out Fig. 1, the extended code of using this ovsf code to generate is specifically described.
Well-known ovsf code can by following formula (1) generate successively code length be 2 times yard.
[numerical expression 1]
The code generating by this formula (1) is no doubt much less between identical code length, even between different code length, so long as not derive from the character with maintenance orthogonality obtaining from tree.
For the extended code (ovsf code) of carrying out two-dimensional expansion, can be expressed as C
m,k× C
n,l.Wherein, C
m,k, C
n,lrepresent respectively the extended code of time orientation, frequency direction.Its subscript represents the rate of spread (being also labeled as below " SF ") and code numbering.For example " m, j " represents j the extended code that the rate of spread is m.Wherein, the Kronecker of "×" representing matrix (Kronecker) long-pending (direct product).Its object lesson is as follows.
[numerical expression 2]
In the matrix notation of two-dimensional expansion code, conventionally take line direction (laterally) as frequency axis, column direction (longitudinally) represents for time shaft.Being multiplied by mutually 2 carries out for method.In 4 × 4 matrixes in formula (2), omitted transposition mark.This formula (2) is illustrated in by the rate of spread of time orientation and frequency direction and is respectively in the two-dimensional expansion code that 4 extended code forms, and a code element after expansion is by adding up to 16(4 × 4) individual chip forms.In this extended code, the relation table of the rate of spread of time orientation and frequency direction is shown " SF4 × 4 "." 4 " that are positioned at before "×" represent the rate of spread of time orientation, and are positioned at the rate of spread of " 4 " expression frequency direction thereafter.The relation of other rates of spread is also used identical representation.
Different extended code C
m1, k1× C
n1, l1and C
m2, k2× C
n2, l2at C
m1, k1⊥ C
m2, k2and C
n1, l1⊥ C
n2, l2relation at least any relation situation about setting up under orthogonal.That is, at least any direction in time orientation and frequency direction is orthogonal, orthogonal as a whole.
Use the code territory of the extended code of ovsf code generation to become intrinsic yard territory according to the rate of spread of extended code and code numbering.Fig. 1 represents the relation in the extended code that adopts in time orientation and frequency direction respectively and code territory thereof.For example two-dimensional expansion code C
8,6× C
4,0because the extended code of time orientation is C
8,6and the extended code of frequency direction is C
4,0, therefore occupy the code territory corresponding with them.The longitudinal axis and transverse axis are all that the larger scope of occupying on code space of the rate of spread is less.Also make thus a yard territory diminish.
In order to make, not only two-dimensional expansion code (chip) entirety is orthogonal, even if it is also orthogonal with other two-dimensional expansion code only to take out this part of a part, as long as select, want the part of taking out from this extended code as a two-dimensional expansion code, generate two-dimensional expansion code and make orthogonal.The two-dimensional expansion code of selecting taking-up part is equivalent to the little extended code of either party than the former rate of spread in time orientation and the frequency direction of the two-dimensional expansion code for expanding.
For example two-dimensional expansion code C
4,3× C
4,1the rate of spread that is time orientation and frequency direction is 4, is the extended code of SF4 × 4.In this two-dimensional expansion code, can consider as shown in Fig. 2 A～C, using a part take out as SF1 × 4, the extended code of SF4 × 1 or SF2 × 2.Thus, in the case of with in this part of extended code any all orthogonal two-dimensional expansion code come multiplexing multiple channels, as long as select to meet completely the extended code of following three conditions.
On time orientation with extended code C
4,3orthogonal (condition 1).
In frequency direction with extended code C
4,1orthogonal (condition 2).
In the 2 dimensional region of time orientation and frequency direction with two-dimensional expansion code C
2,1× C
2,0orthogonal (condition 3).
Fig. 3 is the figure of the distribution method of the two-dimensional expansion code of explanation present embodiment.In this Fig. 3, only distributing two-dimensional expansion code C
4,3× C
4,1situation under, with code domain representation as the two-dimensional expansion code of the distribution object of other channels.
In Fig. 3, with the extended code that the region A4 of dotted line is time orientation be C
4,3region, with the extended code that the region A3 of round dot dotted line is frequency direction be C
4,1region.Region A4 does not satisfy condition 1, and region A3 does not satisfy condition 2.With solid line surround region A1 be that two-dimensional expansion code is C
2,1× C
2,0region, do not satisfy condition 3.
The extended code C of frequency direction
4,1the extended code C that is 2 by extension frequency
2,0generate.Thus, extended code C
2,0for extended code C
4,1the extended code of upper layer.Thus, the two-dimensional expansion code that has yard territory in the A4 of region can utilize extended code C
4,3× C
2,0the rate of spread that is SF4 × 2 is carried out contrary expansion.Equally, the two-dimensional expansion code that has yard territory in the A3 of region can be used extended code C
2,1× C
4,1carry out contrary expansion.The two-dimensional expansion code in the A1 of region with yard territory can utilize extended code C
4,3× C
2,0and C
2,1× C
4,1in either party carry out contrary expansion.
In the region suitable with above-mentioned zone part in addition, use in the region A2 shown in oblique line two-dimensional expansion code C
4,3× C
4,1certainly with SF1 × 4, SF4 × 1 and SF2 × 2(Fig. 2 A～C from wherein taking out) extended code also orthogonal.In addition also orthogonal with the extended code of SF2 × 4 and SF4 × 2.
Can meet respectively to each channel allocation of the transmission for code element (data) like this two-dimensional expansion code of full terms 1～3.
Fig. 4 be explanation to two channel allocation become the figure of the two-dimensional expansion code of the object of distributing to other channels two-dimensional expansion code in the situation that.In this Fig. 4, as two-dimensional expansion code, distributed C
8,0× C
8,0, C
8,2× C
8,1.Region B1, B3 are equivalent to their code territory.
With solid line surround B2Jiang region, region B1 be contained in inside, do not satisfy condition 3 here.Equally, in the region B6 surrounding with solid line, contain region B3, do not satisfy condition 3.In the region B5 of the region of inner inclusion region B1 B4 and inner inclusion region B3, do not satisfy condition 2 respectively.In the region B8 of the region of inner inclusion region B1 B7 and inner inclusion region B3, do not satisfy condition 1 respectively.Thus, the two-dimensional expansion code that only has a yard territory in the region B9 with shown in oblique line becomes the object of distributing to other channels.
Fig. 5 be explanation to three channel allocation become the figure of the two-dimensional expansion code of the distribution object of other channels two-dimensional expansion code in the situation that.In this Fig. 5, from state shown in Fig. 4, further distributed C
8,1× C
8,2as two-dimensional expansion code.
In this Fig. 5, region C1, C2 are equivalent to respectively region B1, the B3 in Fig. 4.Region C3 is equivalent to two-dimensional expansion code C
8,1× C
8,2code territory.The region C4 vertical line that does not become distribution object due to region C1 represents.The same region C5 horizontal line that does not become distribution object due to region C2 represents, the region C6 oblique line that does not become distribution object due to region C3 represents.C4Nei region, region C7 is due to region C1 and C2 and do not become the region of distribution object.Equally, region C8 is due to region C1 and C3 and got rid of from distribution object, and region C9 is got rid of from distribution object due to region C1～C3.Its result, the two-dimensional expansion code in the region 10 that utilizes the oblique line different from region C6 to represent with yard territory becomes the object of distributing to other channels.
At transmitter side, carry out the distribution of the two-dimensional expansion code to each channel as mentioned above.By carrying out such distribution, receiving (user) side, the code element of the channel receiving not only can all utilize the former rate of spread to carry out contrary expansion in time orientation and frequency direction, but also can utilize all the time at least one party's rate of spread less than the former rate of spread in time orientation and frequency direction to carry out contrary expansion.Therefore, can positively utilize the contrary expansion of carrying out receiving symbol corresponding to the more suitably rate of spread of transmission path state at receiver side.This means and can carry out more high-precision detection (recovery) to receiving symbol, can maintain all the time high receiving feature.
Owing to can changing at receiver side for the rate of spread of contrary expansion, therefore avoided each receiver side transmitting channel to infer the necessity with pilot frequency code element etc.Therefore also can maintain all the time the high utilization ratio of power system capacity.
Fig. 6 is the figure of the structure of the communicator of explanation the first execution mode.This communicator 60 has been installed the dispensing device that carries out as mentioned above the distribution of two-dimensional expansion code.For example be applied to radio base station apparatus.Below with reference to Fig. 6, this communicator 60 is elaborated.
In data to be sent (code element), conventionally except the data of receiving and dispatching between user, also there is pilot frequency code element or control data.Pilot frequency code element can not applied the different rates of spread to each user, so can use the common rate of spread to each user.After in data are stored in to buffer memory 612 temporarily, to multiplexing unit 601, export.
Multiplexing unit 601 is for example carried out multiplexing to the data of input, be converted to the serial data of each channel.The extended code of extended code generating unit 602 difference rise time directions and frequency direction.Two-dimensional expansion portion 603 is from extended code generating unit 602 to each channel input expanding code, and from multiplexing unit 601 to each channel input serial data.Thus, use the extended code of input, according to each channel, carry out the expansion for the serial data of inputting from multiplexing unit 601.
Fig. 7 is the figure of the structure of explanation extended code generating unit 602 and two-dimensional expansion portion 603.
As shown in Figure 7, extended code generating unit 602 has: for the F extended code dispenser 611 of the extended code of each channel generated frequency direction; And for the T extended code dispenser 612 of the extended code of each channel rise time direction.Another two-dimensional expansion portion 603 has: the extended code of frequency of utilization direction and time orientation, take channel as unit, data are expanded to multiple expansion modulation portion 701 of modulating; The addition portion 702 data the expansion modulation of exporting from each expansion modulation portion 701 being added take subcarrier as unit; And the data from 702 inputs of each addition portion are added are carried out IFFT(invert fast fourier transformation) IFFT portion 703.Thus, two-dimensional expansion portion 603 exports the data after the expansion modulation of each channel has been carried out to multiplexing signal to sending part 604.
Sending part 604 is loaded in the signal of inputting from two-dimensional expansion portion 603 carrier wave, and exports after amplification.The analog signal of output is sent out via duplexer 605 and antenna 606.
On the other hand, the signal that antenna 606 receives is exported to acceptance division 607 via duplexer 605, as digital signal, is extracted out.The reception signal that extracts is through demodulation section 608 demodulation, and infer portion 610 to detection section 609 and transmission path, exports.Detection section 609 is used through the reception signal of demodulation and carries out detection, using its result as receiving data output.Here, suppose that transmission (user) side (Figure 12) do not used the expansion of two-dimensional expansion code.
Transmission path is inferred portion 610 according to such as incoming level or decline etc. through the reception signal of demodulation, each channel is inferred to the state of transmission path, and this is inferred to result and exports to rate of spread control part 611.Rate of spread control part 611 is inferred result corresponding to this, decides the extended code of distributing to each channel, and makes extended code generating unit 602 generate extended code.In addition the information (code information) and the rate of spread thereof that represent the extended code of distributing are exported to buffer 612 as controlling data.Thus these information are sent to receiver side with the form of controlling data.
Rate of spread control part 611 for example decides with reference to the extended code allocation table shown in Fig. 8 or Fig. 9 the extended code of distributing to each channel.Such table is stored in built-in nonvolatile memory.
In Fig. 8 and Fig. 9, the channel of state the best of transmission path (can obtain the channel of highest communication speed) is corresponding to data A, and the poorest channel of its state is corresponding to data C.Thus, rate of spread control part 611 also can be distributed to each channel by the best two-dimensional expansion code of the state corresponding to transmission path with reference to any one table in Fig. 8 and Fig. 9.Table shown in Fig. 8 has gathered becomes the two-dimensional expansion of the object of distributing to each channel code, and the table shown in Fig. 9 has gathered two-dimensional expansion code with the form that limits the rate of spread that becomes the object of distributing to each channel.Fig. 8 and Fig. 9 table shown in is separately an example, and its content can suitably determine.For example send pilot frequency code element channel (pilot channel), sending the quantity separately of channel (data channel) that controls the channel (control data channel) of data and send data can arbitrary decision with the two-dimensional expansion code etc. that can distribute to these channels.
Figure 10 is for the channel of table shown in key diagram 8 and become the relation in the code territory that the two-dimensional expansion code of the distribution object of this channel occupies.By this Figure 10, obviously known whole channels are orthogonal.Sending in the channel of common pilot code element, except SF4 × 4, even if utilize the either party in SF1 × 4, SF2 × 2 and SF4 × 1 to carry out contrary expansion, also orthogonal with other all channels.This is also same in the table shown in Fig. 9.In Fig. 8～Figure 10, the rate of spread of extended code and code numbering are marked in bracket.
Figure 11 is that extended code allocation table generates the flow chart of processing.
Need to guarantee all the time to send the channel (pilot channel) of pilot frequency code element.Therefore wish that the code territory that pilot channel occupies is as far as possible little.Generation processing shown in Figure 11 is considered this situation and generation table.The program that for example can make computer (data processing equipment) starting develop for generating this table is carried out this processing." N " in Figure 11 represents the sum of pilot channel.
First in step S1, for pilot channel, from there is the set U of two-dimensional expansion code of the required rate of spread, select extended code arbitrarily, distribute to the first pilot channel, by 1 substitution variable n.In follow-up step S2, whether the value of decision variable n is below total N.When the value of variable n is larger than total N, result of determination is "No", and finishes a series of processing at this.In addition situation result of determination is "Yes", proceeds to step S3.
In step S3, calculate and completed the whole yards of territories that the pilot channel of distribution occupies.In step S4 below, be subordinated to the adjacent whole extended codes in code territory that extract on code space in the unappropriated extended code of gathering U and calculate, for extracted each extended code, calculate this extended code is distributed to all codes territories in the situation of pilot channel, the extended code of the code territory minimum calculating is distributed to n pilot channel, the value of variable n is increased.Then return to above-mentioned steps S2.Can distribute successively two-dimensional expansion code and make all codes territory minimum each pilot channel thus.
In the present embodiment, the extended code of distributing to other channels except pilot channel dynamically changes with reference to the extended code allocation table shown in Fig. 8 or Fig. 9, but also can dynamically change not with reference to this table the extended code of distributing to each channel.This change can be carried out as the extended code allocation table as shown in Figure 11 generates the algorithm being adopted in processing by application examples.This application examples limits and should become the two-dimensional expansion of distribution object table corresponding to the state of the transmission path of being inferred as needed only, and the two-dimensional expansion table that extracts former code territory minimum from the two-dimensional expansion table limiting distributes.
Figure 12 is the figure of the structure of the communicator that shown in explanation and Fig. 6, communicator communicates.This communicator 1200 is mobile terminal apparatus that for example user carries.The communicator 60 arranging that aptly supposition is fixed is called radio base station apparatus later, and the communicator communicating with it 1200 is called to mobile terminal apparatus.Below by mobile terminal apparatus 1200 referred to as " mobile terminal ".
The signal being received by antenna 1201 is exported to acceptance division 1203 via duplexer 1202, and is extracted out as digital signal.The reception signal extracting is by FFT(fast fourier transform) portion 1204 carries out FFT, and extracts data for each subcarrier.The data of each subcarrier respectively to pilot tone against extension 1205, control data inverse extension 1206 and data inverse extension 1207 and export.
Pilot tone, against extension 1205 take pilot channel as object carries out contrary expansion, is controlled equally data inverse extension 1206 and is sent control data.Contrary expansion is carried out respectively in channel, data inverse extension 1207 take data channel as object.
Figure 13 is the figure of explanation pilot tone against the structure of extension 1205.
As shown in figure 13, pilot tone has against extension 1205: multiple pilot tones of carrying out contrary expansion take the pilot channel rate of spread different as object utilizes are against extension 1301; With from each pilot tone against extension 1301 input carry out the result that contrary expansion obtains, select the selection control part 1302 of the best rate of spread.This selection control part 1302 is exported the synchronous detection signal calculating according to the result of the rate of spread of pilot tone utilization the best being carried out obtain against expansion and the information that represents the selected rate of spread to synchronous detection portion 1208.Synchronous detection portion 1210 is only exported to synchronous detection signal.
The radio base station apparatus 60 of transmitter side sends code information and the rate of spread with the form of controlling data.Controlling data inverse extension 1206 exports the data after contrary expansion to synchronous detection portion 1208.Making thus these information exchanges cross synchronous detection portion 1208 is extracted out by synchronous detection.These information are exported to extended code generating unit 1209.
Extended code generating unit 1209 identifies extended code and the rate of spread for contrary expansion from the information being sent as control data by transmitter side.In data inverse extension 1207, use the extended code and the rate of spread that identify to carry out contrary expansion to data.The data that obtain by contrary expansion are exported to synchronous detection portion 1210, used by the optimal synchronisation detection signal of selecting control part 1302 to export and carry out synchronous detection.The former data that extracted by this synchronous detection are output as receiving data.
Here the variation of the rate of spread for the contrary expansion of pilot tone is elaborated.
Figure 14 is the figure of the renewal unit of the explanation rate of spread.In figure mark the region of D on code space, represent to upgrade unit.
Can upgrade the rate of spread of at least one party in time orientation and frequency approach.Upgrading the D of unit should upgrade the rate of spread of the one party of time orientation and frequency direction to which direction for judging.On time orientation, for example corresponding to the variable quantity during certain, carry out the renewal of the rate of spread.The variable quantity for example producing in corresponding to the subcarrier at different frequency in identical timing in frequency direction upgrades.Can adopt big or small dispersion, the SNR(power signal-to-noise ratio of phase place, signal amplitude) dispersion etc. as variable quantity.
Figure 15 is that the figure shifting between the rate of spread of rate of spread renewal is followed in explanation.In figure, a～f of mark represents to carry out along the condition that is marked with the transfer between the rate of spread of arrow of this label a～f.Particularly, be respectively following condition.Here, the variable quantity of time orientation is expressed as to g_SF, the variable quantity of frequency direction is expressed as to h_SF, the rate of spread in application is shown to Th(SF in the permission variable quantity upper limit tables of time orientation, U, t), its lower limit tables is shown to Th(SF, L, t), the rate of spread in application is shown to Th(SF in the permission variable quantity upper limit tables of frequency direction, U, f), its lower limit tables is shown to Th(SF, U, f), the content example of each condition a～f is shown.Wherein, the rate of spread in application is expressed as SF.Utilizing the rate of spread that this SF represents is the such rate of spread in SF1 × 4.Its upper limit, lower limit are redefined for threshold value.
A: meet g_SF<Th (SF, L, t)
B: meet g_SF>Th (SF, U, t)
C: meet h_SF>Th (SF, U, f)
D: meet h_SF<Th (SF, L, f)
E: meet g_SF<Th (SF, L, t) and h_SF>Th (SF, U, f)
F: meet g_SF>Th (SF, U, t) and h_SF<Th (SF, L, f)
Thus, the rate of spread that Figure 17 shows in application is SF2 × 2 o'clock, when satisfied for example condition e, transfers to SF4 × 1, and the rate of spread of time orientation becomes 4 from 2 upgradings, and the rate of spread of frequency direction becomes 1 situation from 2 degradations.Same Figure 17 also shows and when satisfying condition a, transfers to SF4 × 2, transfers to SF2 × 4 when satisfying condition d, transfers to SF1 × 4 when satisfying condition f.Other too.Must only in the case of existing the rate of spread that should shift, just carry out this transfer.
Even the rate of spread is upgraded described in above, also can carry out contrary expansion with the best rate of spread.Also can multiple rates of spread carry out respectively contrary expansion to pilot channel thus.
Also can in transmitter side (wireless base station) 60, take the channel outside pilot channel as object, carry out the transfer shown in timing application drawing 15 that divides of above-mentioned two-dimensional expansion code.As long as now make rate of spread control part 611 have, obtain the function of variable quantity g_SF, h_SF and the variable quantity g_SF, the h_SF that by this function, are obtained and each threshold value are compared to the function that decides the rate of spread that shift.
As the variable quantity of time orientation, also can be conceived to postpone expansion.The state of the less transmission path of this delay expansion is better in frequency direction.Preferred in the situation that being conceived to postpone expansion thus, delay expansion is less just more upgrades the rate of spread take frequency direction as preferential form.Receiving feature can be maintained under high state all the time thus.
Mobile terminal 1200 is to be carried as prerequisite by user.The state of transmission path also changes along with translational speed (with the relative moving speed of the radio base station apparatus 60 communicating).Also can infer this translational speed in the variation of the incoming level of the mobile terminal 1200 lateral root numbers of it is believed that or decline etc.Also can be conceived to thus translational speed and upgrade the rate of spread.When this translational speed hour, conventionally can on time orientation, obtain enough rates of spread, so the rate of spread of frequency direction can adopt the Comparatively speaking less rate of spread.On the other hand, when this translational speed is large, the state deteriorating of the transmission path of time orientation, so preferably the rate of spread of time orientation adopts the rate of spread less than the former rate of spread.Also can be conceived in addition multiple because usually carrying out rate of spread renewal in factor.
Even if carried out as mentioned above the renewal for the rate of spread of contrary expansion, also receiving feature can be maintained to higher state, can all the time the utilization ratio of power system capacity be maintained to high utilization ratio.Also the information of so having carried out the rate of spread of upgrading can be sent to radio base station apparatus 60.
< the second execution mode >
In the above-described first embodiment, radio base station apparatus 60 is inferred the state of transmission path according to reception signal.On the other hand, in the second execution mode, from mobile terminal by the state notifying of transmission path to radio base station apparatus.
Each self-structure major part of the radio base station apparatus in the second execution mode and mobile terminal is basic identical with the each structure in the first execution mode.Move also identical.Therefore to the essentially identical part mark of the first execution mode same numeral, and only the part different from the first execution mode described.
Figure 16 is the figure of the structure of the communicator (radio base station apparatus) 60 of explanation the second execution mode.
As mentioned above in the second execution mode, from the state in mobile terminal 1200 notification transmission paths.Therefore do not have transmission path to infer portion 610, and the rear class at detection section 609 in generation has configured separation unit 1601.
The notice of the state of transmission path is undertaken by control data.Detection section 609 carries out the detection of the data of each channel, and its result is exported to separation unit 1601.Separation unit 1601 therefrom extracts the data for the control data channel of the state in notification transmission path, and exports to rate of spread control part 1602.Thus the state of the transmission path detecting in mobile terminal 1200 sides is reflected to and mixes dividing of extended code.
Figure 17 is the figure of the structure of the communicator (mobile terminal) 1200 of explanation the second execution mode.
In the second execution mode, by sending the rate of spread information exported against extension 1205 of pilot tone, thereby to the state in radio base station apparatus 60 notification transmission paths.Therefore the rate of spread information exchange that pilot tone is exported against extension 1205 is crossed multiplexing unit 1701 quilt and data-reusings.
Rate of spread information to be sent represents to carry out according to actual the determined best rate of spread information of result that contrary expansion obtains.By sending (feedback) this rate of spread information, can in radio base station apparatus 60, carry out more rightly the distribution of two-dimensional expansion code.
Also can only when changing, the rate of spread send rate of spread information.Pilot tone against the selection control part 1302 of extension 1205 each while receiving pilot channel, all confirm the pilot channel from newly receiving that whether the selected rate of spread equates with the selected rate of spread before this, the information of output selected rate of spread from the pilot channel newly receiving in unequal situation.Upgrade at any time as required thus the rate of spread for the contrary expansion of data channel.
Also can carry out by sending other information outside the above-mentioned rate of spread information notice of the transmission path state to radio base station apparatus 60.Particularly, can be also conceived to data channel and select the rate of spread of (renewal) information, can also be to be conceived to postpone expansion or self device translational speed of 1200 and the information of selecting the rate of spread of (renewal).Also can be wherein multiple.
< the 3rd execution mode >
In above-mentioned the first and second execution modes, the data between mobile terminal 1200 → radio base station apparatus 60 send does not carry out with two-dimensional expansion code.The 3rd execution mode is all used two-dimensional expansion code in two-way data send.
Figure 18 is the figure of the structure of the communicator of explanation the 3rd execution mode.This communicator on the communicator shown in Figure 17 (mobile terminal) 1200 according to the function of carrying out data transmission with two-dimensional expansion code.Therefore to the label identical with the essentially identical part mark of structure shown in Figure 17.
In the 3rd execution mode, the rate of spread information that pilot tone is exported against extension 1205 is directly input into extended code generating unit 1209.This extended code generating unit 1209 generates by the specified extended code of rate of spread information of inputting and exports to two-dimensional expansion portion 1801 and data inverse extension 1207.Data inverse extension 1207 is used the extended code of inputting from extended code generating unit 1209 to control the contrary expansion of data channel and data channel.
Another two-dimensional expansion portion 1801 is used the extended code of exporting from extended code generating unit 1209 to carry out the expansion of data, identical with the two-dimensional expansion portion 603 shown in Figure 16, to sending part 1212 output signals.Thus this signal is sent by sending part 1212 and via duplexer 1202 and antenna 1201.
Like this, in the 3rd execution mode, making that the contrary spreading result of pilot channel is reflected to data sends.Owing to substantially not considering to make due to the direction of transmission data the significantly different situation of state in identical traffic path, even independently determined respectively the rate of spread for the contrary expansion of this signal so receive a side of signal, also can carry out contrary expansion with the suitable rate of spread.
< the 4th execution mode >
Above-mentioned the 3rd execution mode is, on the communicator shown in Figure 17 (mobile terminal) 1200, the situation of carrying out the function of data transmission with two-dimensional expansion code has been installed.The 4th execution mode is the situation of having installed on example radio base station apparatus 60 as shown in Figure 6 for the function corresponding to the data of using two-dimensional expansion code to send.
Figure 19 is the figure of the structure of the communicator (radio base station apparatus) 60 of explanation the 4th execution mode.
The function of the data of expanding by two-dimensional expansion code as reception and send, can adopt example each portion 1202～1210 as shown in figure 12.Therefore in Figure 19 to the essentially identical part mark of the structure same numeral shown in Fig. 6 or Figure 12.
As shown in figure 19, in the 4th execution mode, the signal receiving by antenna 606 is exported to acceptance division 1203 via duplexer 605.The rate of spread information replacement transmission path that pilot tone is exported against extension 1205 is inferred portion 610 and is inferred the result that the state of transmission path obtains, and is output to rate of spread control part 611.Can distribute thus for being that best two-dimensional expansion code is as the two-dimensional expansion code of expanding for data by sending for the state of the transmission path that the mobile terminal of these data infers out.
This mobile terminal can be also the structure shown in Figure 18.Or also can be configured to rate of spread control part 611 and carry out the distribution of extended code according to the detection result of synchronous detection portion 1208, replace according to the rate of spread information of inputting against extension 1205 from pilot tone and carry out the distribution of extended code.In the communicator of the structure shown in Figure 19 and Figure 18, can also communicate as prerequisite can and have between other communicators of same structure.This communicator also comprises transmitter-receiver.
Other execution modes of < >
In the communication technology, exist for obtaining the various technology of wishing performance.Here the situation that application is arranged on to the representational communication technology in the dispensing device on example radio base station apparatus (communicator) 60 as shown in Figure 6 describes as the execution mode beyond above-mentioned.To with the essentially identical part mark of the structure shown in Fig. 6 same numeral.
Figure 20 is the figure of the structure of the dispensing device of explanation the 5th execution mode.This dispensing device has been applied diversity transmission technology.
In the 5th execution mode shown in Figure 20, there is respectively two two-dimensional expansion portions 603, sending part 604 and antenna 606.From the diversity processing section 2001 of for example each channel being prepared, each two-dimensional expansion portion 603 is exported respectively to data (code element).Extended code generating unit 602 is exported identical extended code for identical data to each two-dimensional expansion portion 603.
Each diversity processing section 2001 is inputted data from the multiplexing unit 601 shown in Fig. 6, and these data are converted to orthogonal sequence, and the data after conversion are exported to each two-dimensional expansion portion 603.Each two-dimensional expansion portion 603, after identical data (channel) being expanded with identical spreading codes, exports the data after expansion to sending part 604 thus.Its result, sends respectively identical signal from each antenna 606.
Figure 21 is the figure of the structure of the dispensing device of explanation the 6th execution mode.This dispensing device is by additive method application diversity transmission technology.
In the 6th execution mode shown in Figure 21, from the multiplexing unit 601 shown in Fig. 6, respectively each two-dimensional expansion portion 603 is inputted to identical data.Extended code generating unit 601 is exported orthogonal extended code for identical data to each two-dimensional expansion portion 603 thus.By such extended code being exported to each two-dimensional expansion portion 603, thereby do not need the diversity processing section 2001 shown in Figure 20.
In the structure shown in Figure 21, if make multiple user's common pilot channel (code element), need to generate the two-dimensional expansion code of the number more than radical of antenna 606, these two-dimensional expansion codes not only two-dimensional expansion code entirety are orthogonal, even if it is also orthogonal with other extended code to take out a part, all meet above-mentioned condition 1～3.If for example consider the extended code of SF4 × 4, as shown in Figure 22 A～Figure 22 C, can distribute simultaneously reach four with SF4 × 1, SF4 × 2, SF2 × 2 and SFN × 4(N=1,2,4) in any rate of spread carry out contrary expansion or orthogonal extended code.By making the quantity that yard territory further increases or further inhibition can be carried out the rate of spread of contrary expansion, thereby can further increase the quantity of this extended code.A～the D representing in Figure 22 A～Figure 22 C represents respectively the code territory of the extended code that can distribute 4.
Figure 23 is the figure of the structure of the dispensing device of explanation the 7th execution mode.This dispensing device has been applied MIMO(Multiple Input and Multiple Output, multiple-input and multiple-output) technology.
In the 7th execution mode shown in Figure 23, multiplexing unit 601 is exported to each two-dimensional expansion portion 603 to multiple sequence allocation data (code element).Therefore, identical with above-mentioned the 6th execution mode, if make multiple user's common pilot channel (code element), need to generate the two-dimensional expansion code of the number more than radical of antenna 606, not only two-dimensional expansion code whole-body quadrature of these two-dimensional expansion codes, even if it is also orthogonal with other extended code to take out a part, all meet above-mentioned condition 1～3.
Here, other execution modes of having applied in the situation of diversity transmission technology and MIMO technology are illustrated as the five～seven execution mode, but also can extensive use other technologies in addition.
Claims (1)
1. a communication system, it comprises dispensing device and receiving system, and this dispensing device is used at the two-dimensional expansion code of time orientation and frequency direction expansion and is carried out transmitted signal, and this receiving system receives the described signal sending from described dispensing device, it is characterized in that,
Described dispensing device has:
Selected cell, it is chosen in orthogonal extended code at least one direction in described time orientation and described frequency direction; And
Transmitting element, it utilizes selected described extended code to expand signal, and sends this signal,
Selected described extended code can be divided into plural part, in each part at least one direction in described time orientation and described frequency direction, there is the rate of spread less than the rate of spread of each selected extended code, and in each part at least one direction in described time orientation and described frequency direction, orthogonal with selected other extended code.
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| CN1273732A (en) * | 1998-07-07 | 2000-11-15 | 松下电器产业株式会社 | Transmitter and receiver and data transmission method |
| CN1364358A (en) * | 2000-03-17 | 2002-08-14 | 松下电器产业株式会社 | Radio communication apparatus and method |
| CN1386344A (en) * | 2000-07-26 | 2002-12-18 | 三菱电机株式会社 | Multi-carrier CDMA communication device, multi-carrier CDMA transmitting device, and multi-carrier CDMA receiving device |
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| CN100568789C (en) * | 2001-08-30 | 2009-12-09 | 株式会社Ntt都科摩 | Wireless transmission system and method and sending station device that in this wireless transmission system, uses and receiving platform device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1273732A (en) * | 1998-07-07 | 2000-11-15 | 松下电器产业株式会社 | Transmitter and receiver and data transmission method |
| CN1364358A (en) * | 2000-03-17 | 2002-08-14 | 松下电器产业株式会社 | Radio communication apparatus and method |
| CN1386344A (en) * | 2000-07-26 | 2002-12-18 | 三菱电机株式会社 | Multi-carrier CDMA communication device, multi-carrier CDMA transmitting device, and multi-carrier CDMA receiving device |
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