CN1773897A - Resource distributing method and apparatus of dynamic time-frequency and code sequence - Google Patents

Abstract

A resource distribution method of dynamic time frequency and code sequence includes searching suitable time frequency resource block as per channel quality, finalizing time frequency resource distribution to channel; finalizing code sequence distribution according to distributed code sequence information in time frequency resource block.

Description

The resource allocation methods and the device of dynamic time-frequency and sign indicating number sequence

Technical field

The present invention relates to resource allocation techniques, specially refer in the OFDM-CDMA multi-address system, comprise the dynamic channel assignment method and the device of running time-frequency resource and sequence resource.

Background technology

Code division multiplexing (CDMA) is the radio spread spectrum communication technology that is used for a kind of advanced person of digital mobile cellular telecommunication in recent years.Code division multiplexing (CDMA) system adopts direct sequence spread spectrum (DS-SS), to overcome the frequency selective fading in the channel, disturbs (being called for short MAI) but its capacity is subject to multiple access, and MAI derives from the auto-correlation and the their cross correlation of incomplete spreading code.A kind of method that suppresses to cut general interference in frequency selective fading channels is with CDMA technology and multi-carrier modulation, and is combined as OFDM (OFDM) technology, forms various OFDM-CDMA system, to reach higher spectrum efficiency.CDMA multiple carrier (MC-CDMA) and orthogonal frequency domain code division multiplexing (OFCDM) are exactly typical case's representative of OFDM-CDMA system.Consider in the multi-carrier CDMA system, orthogonal spectrum expansion is the characteristics of carrying out at frequency domain, David Mottier and Damien Castelain are in " A spreadingsequence allocation procedure for MC-CDMA transmission systems " literary composition of delivering in IEEE VTC ' 2000 periodicals the 3rd volume in September, 2000, mentioned in CDMA multiple carrier (MC-CDMA) system based on Walsh (Walsh) sign indicating number, the method of the sign indicating number sequence allocation that provides is disturbed to reduce at the MAI between multichannel under the non-ideal communication channel equilibrium situation.Afterwards, Qinghua Shi and M.Latva-aho are in " Simple spreading code allocation scheme for downlink MC-CDMA " literary composition of delivering among the Electronicsletters in July, 2002, based on the characteristics of Walsh (Walsh) sign indicating number in frequency domain distribution, a sign indicating number sequence allocating method of more simplifying further is provided in the MC-CDMA system.

Based on CDMA technology and multi-carrier modulation technology, Liao Jingyi, people such as Wang Hai have proposed the code division multiple access access technology (VSFH-OTFCDM) based on the quadrature time-frequency domain of variable spread spectrum and frequency hopping in the patent application of " based on the CDMA access method of the quadrature time-frequency domain of variable spread spectrum and frequency hopping ".Its thinking is utilized frequency hopping exactly and is become spreading factor and controls the quadrature code channel jointly at time-frequency domain, adopts the variable Rate orthogonal spectrum expansion, and spread spectrum information is mapped to the subcarrier of time-frequency domain, and transmits by ofdm system.In the VSFH-OTFCDM system, time, frequency and orthogonal intersection have been formed the channel resource that is used for transfer of data jointly.Disturb for reducing multiple access, should guarantee each channel, the mutually orthogonal property in frequency and sign indicating number territory in the time.

VSFH-OTFCDM access scheme and a lot of OFDM-CDMA multi-address system are similar, and spread spectrum information all is to transmit with the subcarrier in one or more OFDM code elements, therefore disturb for reducing multiple access, and the orthogonality between the multi-user also need be maintained at time-frequency domain.A channel is gone up a transmission unit that orthogonal spreading sequence is formed that distributes by comprising one or more temporal frequency pieces (TFB) to give a definition.Wherein, each temporal frequency piece is made up of time-domain and the continuous or discontinuous subcarrier of frequency domain, and for ease of channel equalization and system design, the time of temporal frequency piece and frequency range should be less than channel coherence time and coherence bandwidths.

When the spreading factor (SF) of orthogonal intersection during greater than total number of sub carrier wave of a TFB piece, the running time-frequency resource of a channel will be made up of a plurality of temporal frequency pieces (TFB).According to the method for choosing, the TFB piece of channel is formed can adopt the static channel allocation method, and promptly each channel is by pre-set scheme or formula distribution T FB piece.The advantage of this distribution method is that resource allocation methods is simple, and shortcoming is that some TFB piece of forming this channel may suffer from deep fade, thereby influences systematic function.The method that another kind of channel is formed is to adopt the method for dynamic channel allocation, form the TFB piece of channel and can distribute to certain channel according to its characteristic of channel, such as the TFB piece that distribution has good channel quality, avoid its influence that meets with deep fade, thereby improve systematic function.

But adopt the method for this dynamic channel allocation, the TFB piece of distributing to each channel will present random distribution in the temporal frequency domain of OFDM, especially when the SF of the orthogonal intersection factor during greater than total number of sub carrier wave of a TFB piece, more need effectively to align and hand over spread spectrum code sequence to choose, to satisfy the time of channel allocation, the orthogonality in frequency and sign indicating number territory is disturbed thereby reduce MAI.Also promptly require newly assigned channel should guarantee orthogonal property with the spreading code of original distribution in these temporal frequency pieces in the distribution of the orthogonal intersection of a plurality of temporal frequency pieces of forming its channel.In the OFDM-CDMA multi-address system, when adopting orthogonal intersection to carry out spread spectrum transmission, keeping with the performance of channel equalization of its orthogonal property is closely bound up.Need further to propose under different situations such as desirable and non-ideal communication channel equilibrium, reduce the method that the MAI between multichannel disturbs.

Summary of the invention

The purpose of this invention is to provide a kind of dynamic channel assignment method and device that comprises running time-frequency resource and sequence resource, wherein sequence allocation is used for the multiple access interference of minimizing system.

According to an aspect of of the present present invention, the resource allocation methods of a kind of dynamic time-frequency and sign indicating number sequence comprises step:

Seek suitable temporal frequency Resource Block according to parameters such as channel qualities, finish time-frequency resource allocating channel;

According to the sign indicating number sequence information that has distributed in the temporal frequency Resource Block, finish the sign indicating number sequence allocation in the temporal frequency Resource Block that distributes.

According to another aspect of the present invention, the resource allocation device of a kind of dynamic time-frequency and sign indicating number sequence comprises:

Modulation module 304 is to the modulation treatment of the information source information 302 of no chnnel coding or chnnel coding;

Channel Mapping module 312 is carried out orthogonal spectrum expansion to modulation intelligence, and with the running time-frequency resource of the information mapping behind the spread spectrum to distribution;

Fu Liye inverse transform block 314 is carried out IFFT to the information after the channel Mapping and is handled, and transmits by ofdm system; TFB resource distribution module 310 decides the TFB piece of channel allocation according to the CQI information among each TFB;

A channel allocation and a sign indicating number allocation manager module 308 are with the information of assigned code collection among storage and the management TFB;

Sequence allocation module 306, according to the administration module 308 sign indicating number collection information of in corresponding running time-frequency resource TFB piece, having distributed of providing, according to the orthogonal property that satisfies multichannel sign indicating number sequence, and the demands such as MAI interference between the minimizing multichannel, in the running time-frequency resource that distributes, finish sequence allocation.

Present invention is directed at the multi-address system of OFDM-CDMA, utilize the dynamic time-frequency resource allocation to have the temporal frequency resource of good channel quality to channel; When the running time-frequency resource of time of channel allocation and frequency resource and other channels partly overlaps, distribute by sign indicating number sequence reasonable resources, safeguard the orthogonal property of multi channel all yards sequence in the temporal frequency resource of part overlapping, the MAI that reduces between multichannel disturbs, and improves the quality of signal transmission.Further provide according to MAI power respective function as judgment condition, under imperfect equilibrium situation, reduced the method that the MAI between multichannel disturbs.This MAI power respective function is used for the degree of correlation between definite sign indicating number sequence.

Description of drawings

Fig. 1 is based on the running time-frequency resource of the channel of ofdm system and forms;

Fig. 2 is that Walsh sign indicating number sequence is formed;

Fig. 3 is based on the dynamic channel allocation model of OFDM-CDMA multi-address system;

Fig. 4 is based on the dynamic time-frequency resource and the sequence allocation flow process of OFDM-CDMA multi-address system;

Fig. 5 is dynamic time-frequency resource and sequence allocation example (SF=8, TFB sub-carrier number=4).

Embodiment

The invention provides a kind of dynamic channel assignment method that comprises running time-frequency resource and sequence resource, wherein the sequence allocation multiple access that is used for the minimizing system disturb (Multiple Access Interference, MAI).Its core concept is the multi-address system for OFDM-CDMA, utilizes the dynamic time-frequency resource allocation to have the temporal frequency resource of good channel quality to channel; When the running time-frequency resource of time of channel allocation and frequency resource and other channels partly overlaps, distribute by sign indicating number sequence reasonable resources, safeguard the orthogonal property of multi channel all yards sequence in the temporal frequency resource of part overlapping, the MAI that reduces between multichannel disturbs.Further provide according to MAI power respective function as judgment condition, under imperfect equilibrium situation, reduced the method that the MAI between multichannel disturbs.This MAI power respective function is used for the degree of correlation between definite sign indicating number sequence.Based on the multi-address system of OFDM-CDMA, the distribution of channel resource will comprise the distribution of one or more temporal frequency Resource Block and sign indicating number sequence resource.

Dynamic channel and sequence allocating method that the present invention mentions are primarily aimed at the OFDM-CDMA multi-address system.Be illustrated in figure 1 as based on the channel of OFDM running time-frequency resource and form.Fig. 1-(a), Fig. 1-(b), Fig. 1-(c) are respectively three kinds of modes forming based on the running time-frequency resource of the channel of ofdm system.In running time-frequency resource structure 10 shown in Figure 1, constitute a temporal frequency piece (TFB) 104 by one or more subcarriers 102, wherein the temporal frequency piece TFB among Fig. 1-(a) is made up of the continuous a plurality of subcarriers of frequency domain, temporal frequency piece TFB among Fig. 1-(b) is made up of the continuous a plurality of subcarriers of time-domain, and the temporal frequency piece TFB among Fig. 1-(c) is made up of time and the continuous a plurality of subcarriers of frequency domain.

The running time-frequency resource that is distributed in channel 106 can be made up of one or more TFB pieces.Adopt the OFDM-CDMA multiple access technology, spread spectrum information will utilize the running time-frequency resource of the channel of being made up of one or more TFB pieces to transmit.

After spreading factor SF is greater than the number of sub carrier wave among the TFB, a channel will be made up of a plurality of TFB.When adopting dynamic channel allocation, a plurality of TFB pieces of forming each channel will show as random distribution in the temporal frequency domain of OFDM.The present invention will provide a dynamic channel allocation and the sign indicating number sequence allocation during greater than the number of sub carrier wave among the TFB as spreading factor SF.

The channel allocation that comprises time-frequency and sequence resource will be finished jointly to the time that comprises in the OFDM-CDMA multi-address system, and frequency and spreading code are in interior resource allocation.Wherein, dynamic time frequency chunks (TFB) resource allocation distributes responsible channel quality information parameters such as (CQI).Under the dynamic time-frequency resource allocation conditions,, will disturb minimum sign indicating number sequence allocation principle to carry out a yard sequence allocation according to MAI at different situations such as perfect balance and imperfect equilibriums.

(Spread Factor, during SF) greater than the number of sub carrier wave in the TFB piece, a channel will be made up of a plurality of TFB when the spreading factor of the frequency expansion sequence of forming channel.Under dynamic time frequency chunks (TFB) resource allocation, can determine to form the temporal frequency resource of a channel according to the information such as size of the CQI value of each TFB piece.Wherein, the CQI value of each TFB piece can be the signal to noise ratio (snr) parameter of this TFB piece or signal interference ratio (SIR) parameter etc.The method of determining the CQI value of each TFB piece can be to utilize Channel Detection information, to the blind Detecting of transmission information, and exploitable channel symmetry characteristic etc. more in time division duplex (TDD) system.

Walsh (Walsh) sequence is used to spread spectrum transmission, and utilizes the orthogonal property of Walsh sequence to finish despreading to spread spectrum information at receiving terminal.Fig. 2 is that 1,2,4,8 times Walsh sign indicating number sequences are formed mode for spreading factor SF.In order correctly to finish the orthogonal dispreading to the spread spectrum information in the OFDM-CDMA system, requirement can be kept the orthogonal property of spread spectrum information when the receiving terminal despreading.Suppose that system is under desirable equilibrium situation, also be that receiving terminal is carrying out under perfect estimation and the channel equalization transmission channel, when being not more than a number of sub carrier wave among the TFB for spreading factor SF, a channel will be made up of a TFB, and this orthogonal property will not be destroyed in transmission course.And as spreading factor SF during greater than the number of sub carrier wave among the TFB, a channel will be made up of a plurality of TFB, special under dynamic time frequency chunks (TFB) resource allocation, a plurality of TFB pieces of forming each channel will show as random distribution in the temporal frequency domain of OFDM.Like this, a plurality of channels may part overlap in the temporal frequency resource, even under perfect balance, the distribution of sign indicating number sequence had both needed to consider the distribution of original yard sequence in the TFB piece of forming channel also needs to consider Walsh (Walsh) sequence characteristic like this.To introduce the composing method of the following yard sequence of perfect balance below.Supposing spreading factor SF=8, also is that frequency expansion sequence length is 8, and each TFB piece contains 4 subcarriers, and the running time-frequency resource of a channel will be made up of 2 TFB.

TFB resource that table 1. distributes and sign indicating number example series

Channel number	TFB piece that distributes number and sequence	TFB piece that distributes number and sequence	TFB piece that distributes number and sequence	TFB piece that distributes number and sequence
					Channel 0	TFB A		TFB C
a 1，0a 1，1a 1，2a 1，3		a 1，4a 1，5a 1，6a 1，7
				Channel 1			TFB B		TFB D
	b 1，0b 1，1b 1，2 b 1，3		b 1，4b 1，5b 1，6 b 1，7
					Channel 2	TFB A			TFB D
c 1，0c 1，1c 1，2c 1，3			c 1，4c 1，5c 1，6c 1，7

Suppose that existing channel 0 and channel 1 are assigned with, wherein, channel 0 takies TFB piece A and C, and the sequence that is assigned with is A=(a _1,0a _1,1a _1,2a _1,3a _1,4a _1,5a _1,6a _1,7); Channel 1 takies TFB piece B and D, and the sequence that is assigned with is B=(b _1,0b _1,1b _1,2b _1,3b _1,4b _1,5b _1,6b _1,7).Suppose that newly assigned channel 2 will take TFB piece A and B, and supposition is C=(c with the sequence of distributing _1,0c _1,1c _1,2c _1,3c _1,4c _1,5c _1,6c _1,7).Channel 2 will overlap on TFB piece A top with channel 0, and 2 of channels will overlap on TFB piece D top with channel 1.Suppose S ₁, S ₂And S ₃Be respectively the data symbols of transmission on channel 0,1 and 2, make C '=[c _1,0, c _1,1, c _1,2, c _1,3, 0,0,0,0], C "=[0,0,0,0, c _1,4, c _1,5, c _1,6, c _1,7], and make C1 and C2 represent the first half and the latter half of sequence C respectively, be C1=c _1,0, c _1,1, c _1,2, c _1,3], C2=[c _1,4, c _1,5, c _1,6, c _1,7].Make expression formula " be expressed as two dot products between vector and.Then according to orthogonal dispreading, for the orthogonality that maintenance channel distributes, the sign indicating number sequence C of distributing for newly assigned channel 2 will satisfy following characteristic:

$\frac{1}{8}A\&CenterDot;(S_{1}A+S_3{C}^{\&prime;})={\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="A20041009049800182.png"\; state="\{\{state\}\}">S</figure-callout>}}_1...\left(1\right)$

$\frac{1}{8}B\&CenterDot;(S_{2}B+S_3{C}^{\&prime;\&prime;})=S_2...\left(2\right)$

Can push away by formula (1) and (2), $\left\{\begin{array}{c}A\&CenterDot;C^{\&prime;}=0\\ B\&CenterDot;C^{\&prime;\&prime;}=0\end{array}\right....\left(3\right)$ , also promptly require the left-half of sequence A and the right half part of sequence B to distinguish quadrature with the left-half C1 and the right half part C2 of sequence C.Simultaneously, because sign indicating number sequence C=[C1 C2] still is the Walsh sequence, therefore, C1 and C2 also will have following characteristics:

C2＝C1 or C2＝-C1 (4)

In conjunction with expression (3) and (4), can release the generation method of yard C:

$\mathrm{subject}.\left\{\begin{array}{ccc}C=[\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A20041009049800182.png"\; state="\{\{state\}\}">C</figure-callout>}1,C2]& & \\ & A\&CenterDot;C^{\&prime;}=0& \\ & B=C^{\&prime;\&prime;}=0& \\ C2=\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A20041009049800182.png"\; state="\{\{state\}\}">C</figure-callout>}1& \mathrm{or}& C2=-\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A20041009049800182.png"\; state="\{\{state\}\}">C</figure-callout>}1\end{array}\right....\left(5\right)$

Illustrate as spreading factor SF during by expression (5) greater than the sub-carrier number in the TFB piece, the transmission frequency expansion sequence transmits in a plurality of TFB, the TFB piece resource of different channels produces the distribution principle of frequency expansion sequence when overlapping, promptly when allocated channel and existing channel have overlapping on running time-frequency resource, should guarantee the orthogonal property of the sign indicating number at overlapping place on running time-frequency resource.Carry out a yard sequence according to this principle and distribute, with the orthogonal property that the sign indicating number that guarantees under the perfect balance distributes, system does not have MAI and disturbs.Further can determine the sign indicating number sequence allocating method under the perfect balance: as spreading factor SF during greater than the sub-carrier number in the TFB piece, in each the possible TFB piece that is certain channel allocation, according to the part or all of sequence of the Walsh sign indicating number that has distributed on it, calculate or table look-up and obtain part or all of sequence with other Walsh sign indicating numbers of its quadrature; Characteristic according to the Walsh sign indicating number is carried out combined sequence, and as being the situation of twice of the sub-carrier number of TFB piece for spreading factor SF, the sequence of only satisfy condition (4) can make up; Continuation is at calculating in the multiple TFB piece combination of distributing in this channel or tabling look-up, to determine the final frequency expansion sequence that distributes.This method can be further used for the situation of the integral multiple that spreading factor SF is the sub-carrier number of TFB piece (＞2), in these situations, the running time-frequency resource of forming channel will comprise a plurality of (＞2) TFB piece, and dynamically the orthogonal sequence resource allocation will need to satisfy the sequence allocation orthogonality of each channel in the TFB piece that overlaps.

In actual environment,, destroy its quadrature decoder because factors such as channel distortions cause MAI to disturb, and then destroy the orthogonality of Walsh sign indicating number.For the system of OFDM-CDMA combination, channel equalization will be finished at the frequency domain of OFDM.Detection technique commonly used, (Equal GainCombining, EGC), Minimum Mean Square Error merges that (Minimum Mean Square ErrorCombining, MMSEC) etc. method can be used to the OFDM-CDMA combined system is carried out channel equalization as equal gain combining.But these methods still can cause certain channel equalization deviation, thereby bring MAI to disturb, and then influence quadrature decoder.Below will utilize MAI power respective function to adjudicate, to determine the sign indicating number assigning process in the channel.Specifically, when producing part and overlap situation, should guarantee the spreading code found out the overlapping place and the orthogonal property of assigned code collection on running time-frequency resource with the running time-frequency resource of other channels; Further collect according to the sign indicating number that has distributed in the running time-frequency resource of each channel allocation, concentrate in residue code and find out suitable spreading code according to the method for MAI power respective function value minimum, this MAI power respective function is used for the degree of correlation between definite sign indicating number sequence.The minimum MAI power respective function of seeking that adopts is represented with formula (6).

${\mathrm{\&Omega;}}_K^{\left(\mathrm{opt}\right)}=\arg \underset{{\mathrm{\&Omega;}}_K\&Element;\mathrm{\&Omega;}}{\min }\left(\max \underset{j\&Element;{\mathrm{\&Omega;}}_K,K\&Element;{\mathrm{\&Omega;}}_K,j\&NotEqual;k}{(-T\left(W^{(j,k)}\right))}\right)...\left(6\right)$

Wherein $T\left(x\right)=\frac{1}{2}\underset{i=0}{\overset{\mathrm{Nc}-2}{\mathrm{\&Sigma;}}}|\mathrm{sgn}\left(x_{i+1}\right)-\mathrm{sgn}\left(x_i\right)|$

Wherein, W ^{(j, k)}Be j, the new vector that obtains after the k sequence multiplies each other, each vector location of new vector is j, the product value of k sequence corresponding unit, Ω _KFor all possible sequence sets closes, the conversion times of T (x) expression vector x zero passage.

Fig. 3 is the dynamic channel allocation model based on the OFDM-CDMA multi-address system.The information source information 302 of no chnnel coding or chnnel coding is carried out modulation treatment via modulation module 304, in channel Mapping module 312, with the orthogonal spectrum expansion of finishing modulation intelligence, and finish the information mapping behind the spread spectrum to the running time-frequency resource that distributes, the information after the channel Mapping finished will be carried out IFFT module 314 and be handled, and transmit by ofdm system the back.System will carry out channel allocation according to information such as assigned sequence resource and channel condition.Wherein, TFB resource distribution module 310 will decide according to CQI information; TFB block message after the selection will convey to channel allocation and sign indicating number allocation manager module 308; In channel allocation and sign indicating number allocation manager module 308, with the information of assigned code collection among storage and the management TFB; The sign indicating number collection information of in corresponding running time-frequency resource TFB piece, having distributed that sequence allocation module 306 provides according to administration module 308, and according to the orthogonal property that satisfies multichannel sign indicating number sequence, reduce the demands such as MAI interference between multichannel, in the running time-frequency resource that distributes, finish sequence allocation.Sequence allocation will be finished according to flow process separately according to desirable and imperfect equilibrium situation.

Based on the dynamic time-frequency resource of OFDM-CDMA system and sequence allocation flow process as shown in Figure 4.At first finish time-frequency resource allocating, can seek suitable TFB Resource Block 400, and therefrom draw the sign indicating number sequence information 402 that has distributed according to information such as channel quality CQI; Finish the sign indicating number sequence allocation under perfect balance afterwards.In this course, at first in module 404, judge newly assigned TFB resource whether and the TFB piece resource of allocated channel whether overlap, if overlap, then will be according to the assignable sign indicating number of the characteristic decision sequence 408 of Walsh sequence.If overlap, then can seek and merge feasible sign indicating number sequence 406 according to formula (5); In the judgement of equilibrium situation 410 modules, if the perfect balance condition, then exportable feasible TFB piece collection and the sequence sets of finding out closes.If not perfect balance, then 412 will be according to MAI power respective function (6) as judgment condition to seek and to determine final feasible sequence.

Under above-mentioned ideal and imperfect equilibrium situation, comprise that the sequence selection in the formula (5) is all only relevant with sequence itself with the MAI power respective function in the formula (6), and do not relate to the characteristic of channel, can select according to the sequence of having distributed or its part, in advance not homotactic combined situation is calculated and stored, needing in dynamic channel allocation, can obtain the sequence information of distribution more rapidly by tabling look-up.

Embodiment

Fig. 5 is 8 for spreading factor SF, and the TFB sub-carrier number is 4 times, dynamic time-frequency resource and sequence allocation example.Suppose that existing two channels have taken TFB piece A in the OFDM code element 1 and the TFB piece D in the OFDM code element 2 respectively, two channels have taken TFB piece B in the OFDM code element 1 and the TFB piece E in the OFDM code element 2 respectively, and two channels have also taken TFB piece C in the OFDM code element 1 and the TFB piece F in the OFDM code element 2 respectively in addition.Further represented among Fig. 5 at TFB piece A, B, the existing sequence among the F is distributed.Suppose in dynamic time frequency resource allocation process, the TFB piece A in the OFDM code element 1, the TFB piece F in B and the OFDM code element 2 meets the demands.The selection course of sign indicating number sequence sees Table 2,3.Wherein, table 2 has been listed under the perfect balance situation, the result of TFB piece that draws according to formula (5) and sign indicating number sequence allocation.Optionally the TFB piece be combined as TFB-A, TFB-F} and TFB-B, TFB-F}, the combination of TFB piece TFB-A, and among the TFB-F} optionally a sign indicating number sequence be c3 or c4, the combination of TFB piece TFB-B, and among the TFB-F} optionally a sign indicating number sequence be c1, c2, c7 or c8.

Table 3 has further been listed under the imperfect equilibrium situation, according to the result of formula (6) TFB piece and sign indicating number sequence allocation.Optionally the TFB piece is combined as { TFB B, TFB F}.The optional sign indicating number sequence that draws according to MAI power respective function is c1 or c2.

Optional TFB piece and sign indicating number sequence under table 2. perfect balance

In OFDM code element 1

In OFDM code element 2

According to the selected TFB piece of CQI	A	B		F
					The sequence of in each corresponding TFB piece, having distributed	(1，1，1，1) (1，-1，-1，1)	(1，-1，1，-1) (1，1，-1，-1)		(1，-1，1，-1)
Assignable sequence in each corresponding TFB piece	(1，-1，1，-1) (1，1，-1，-1)	(1，1，1，1) (1，-1，-1，1)		(1，1，-1，-1) (-1，-1，1，1) (1，-1，-1，1) (-1，1，1，-1) (1，1，1，1) (-1，-1，-1，-1)
					Optionally TFB piece combination	{TFB-A，TFB-F}，{TFB-B，TFB-F}
(5) optional sequence of drawing by formula	c4＝(1，1，-1，-1，-1，-1，1，1) c3＝(1，1，-1，-1，1，1，-1，-1)		C1＝(1，1，1，1，1，1，1，1) C2＝(1，1，1，1，-1，-1，-1，-1) C7＝(1，-1，-1，1，1，-1，-1，1) C8＝(1，-1，-1，1，-1，1，1，-1)

Optional TFB piece and sign indicating number sequence under the imperfect equilibrium of table 3.

Optional code sequence and (6) weights of obtaining by formula in the TFB piece			TFB-A			TFB-B
										Possible sign indicating number sequence		(1，1，-1，-1)			(1，-1，-1，1)		(1，1，1，1)
	The weights set omega (opt)		{-3，-1}			{-3，-1}		{-3，-1}
										TFB-F
	Possible sign indicating number sequence	(1，1， -1，- 1)		(-1，- 1，1， 1)	(1，- 1，- 1，1)	(-1，1， 1，-1)	(1，1， 1，1)		(-1，-1， -1，-1)
										The weights set omega (opt)	-2		-2	-1	-1	-3		-3
	Optional TFB piece combination	{TFB B，TFB F}
Optional sequence											{c1，c2}

The invention provides the method for channel allocation that comprises dynamic time-frequency resource allocation and sequence allocation, utilize the dynamic time-frequency resource allocation to have the temporal frequency resource of good channel quality to channel, the dynamic sequence branch be used in multiple access in the minimizing system disturb (Multiple Access Interference, MAI).Be provided under the perfect balance situation, safeguard the orthogonal property of multi channel all yards sequence, reduce the sequence allocating method that the MAI between multichannel disturbs in the temporal frequency resource of part overlapping.Wherein, sequence allocation should satisfy the orthogonal property of running time-frequency resource overlapping part in the multichannel distribution, finishes sequence allocation by combined sequence afterwards, thereby satisfies the orthogonality of the sequence allocation of whole system.Further be provided under the imperfect equilibrium situation, safeguard the orthogonal property of multi channel all yards sequence, reduce the sequence allocating method that the MAI between multichannel disturbs in the temporal frequency resource of part overlapping.Wherein, as judgment condition, sequence allocation should satisfy the orthogonal property of running time-frequency resource overlapping part in the multichannel distribution, and has the respective function value of minimum MAI power according to MAI power respective function, finish sequence allocation by combined sequence afterwards, the multiple access in the minimizing system disturbs.The channel allocation flow process of dynamic time-frequency resource allocation and sequence allocation is provided under perfect balance situation and the imperfect equilibrium situation.The distribution method that provides is only relevant with sequence itself, and does not relate to the characteristic of channel, thereby these parameters can be calculated in advance and stored, and needing can obtain the sequence information of distribution in dynamic channel allocation by tabling look-up more rapidly, is convenient to system applies.

Claims (12)

1. the resource allocation methods of dynamic time-frequency and sign indicating number sequence comprises step:

Seek suitable temporal frequency Resource Block (TFB piece) according to parameters such as channel qualities, finish time-frequency resource allocating channel;

According to the sign indicating number sequence information that has distributed in the temporal frequency Resource Block, finish the sign indicating number sequence allocation in the temporal frequency Resource Block that distributes.

2. by the described method of claim 1, it is characterized in that described sign indicating number sequence allocation comprises:

Judge newly assigned temporal frequency Resource Block whether and the temporal frequency Resource Block of allocated channel partly overlap;

Do not overlap if there is part, then the sign indicating number sequence of distributing with decision according to the orthogonal property that satisfies sequence.

3. by the described method of claim 1, it is characterized in that the described yard sequence allocation of finishing comprises:

If judge newly assigned temporal frequency Resource Block and the temporal frequency Resource Block of allocated channel part takes place overlaps;

Then according to sign indicating number sequence of having distributed in the temporal frequency Resource Block that overlaps or part sign indicating number sequence information, in the temporal frequency Resource Block that overlaps, seek assignable and satisfy the sign indicating number sequence or the part yard sequence of orthogonal property, and finish the sequence allocation in the whole newly assigned temporal frequency Resource Block by combined sequence.

4. by the described method of claim 3, it is characterized in that also comprising: if newly assigned temporal frequency Resource Block and the temporal frequency Resource Block of allocated channel the part overlapping takes place, and under imperfect equilibrium,

During sign indicating number sequence of distributing or part sequence sets close, seek the sign indicating number sequence or the part sign indicating number sequence that reach multiple access interference (MAI) power respective function minimum value in each temporal frequency Resource Block;

Finish the sequence allocation in the whole newly assigned temporal frequency Resource Block by combined sequence.

5. by the described method of claim 1, it is characterized in that, determine to form the temporal frequency resource of a channel according to the size of the channel quality value of each temporal frequency piece.

6. by the described method of claim 1, it is characterized in that the TFB piece of forming a channel is one or more.

7. by the described method of claim 3, it is characterized in that, in the Walsh orthogonal sequence distributes, when the spreading factor (SF) of the sequence of distributing equals 2N, and when equaling to form the twice of TFB piece sub-carriers number of channel, make C '=[c _1,0, c _1,1..., c _{1, N-1}, 0,0 ..., 0], C "=[0,0,0,0, c _{1, N}, c _{1, N+1}..., c _1,2N-1], C1 and C2 represent the first half and the latter half of sequence C, C1=[c respectively _1,0, c _1,1.., c _{1, N-1}], C2=[c _{1, N}, c _{1, N+1}..., c _1,2N-1], A and B represent to be assigned to the sequence in the TFB piece of sequence C 1 and C2 correspondence respectively.New assigned sequence C will be the combination of sequence C 1 and C2, and meet the following conditions:

$\mathrm{subject}.\left\{\begin{array}{ccc}C=[C1,C2]& & \\ & A\&CenterDot;C^{\&prime;}=0& \\ & B\&CenterDot;C^{\&prime;\&prime;=0}& \\ C2=C1& \mathrm{or}& C2=-C1\end{array}\right.$

8. by the described method of claim 7, it is characterized in that sequence selection is only relevant with sequence itself.

9. by the described method of claim 4, it is characterized in that, under imperfect equilibrium situation, adopt equalization methods such as equal gain combining and Minimum Mean Square Error merging.

10. by the described method of claim 4, it is characterized in that, seek minimum MAI power respective function and represent with following formula:

${\mathrm{\&Omega;}}_K^{\left(\mathrm{opt}\right)}=\arg \underset{{\mathrm{\&Omega;}}_K\&Element;\mathrm{\&Omega;}}{\min }\underset{j\&Element;{\mathrm{\&Omega;}}_K,k\&Element;{\mathrm{\&Omega;}}_{K,},j\&NotEqual;k}{\left(\max (-T\left(W^{(j,k)}\right))\right)}$

Wherein $T\left(x\right)=\frac{1}{2}\underset{i=0}{\overset{\mathrm{Nc}-2}{\mathrm{\&Sigma;}}}|\mathrm{sgn}\left(x_{i+1}\right)-\mathrm{sgn}\left(x_i\right)|$

W ^{(j, k)}Be j, the new vector that obtains after the k sequence multiplies each other, each vector location of new vector is j, the product value of k sequence corresponding unit, Ω _KFor all possible sequence sets closes, the conversion times of T (x) expression vector x zero passage.。

11., it is characterized in that MAI power respective function is all only relevant with sequence itself, and does not relate to the characteristic of channel by the described method of claim 10.

12. the resource allocation device of dynamic time-frequency and sign indicating number sequence comprises:

Modulation module (304) is to the modulation treatment of the information source information (302) of no chnnel coding or chnnel coding;

Channel Mapping module (312) is carried out orthogonal spectrum expansion to modulation intelligence, and with the running time-frequency resource of the information mapping behind the spread spectrum to distribution;

Fu Liye inverse transformation (IFFT) module (314) is carried out IFFT to the information after the channel Mapping and is handled, and transmits by ofdm system;

TFB resource distribution module (310) decides the TFB piece of channel allocation according to the CQI information among each TFB;

A channel allocation and a sign indicating number allocation manager module (308) are with the information of assigned code collection among storage and the management TFB;

Sequence allocation module (306), according to the administration module 308 sign indicating number collection information of in corresponding running time-frequency resource TFB piece, having distributed of providing, according to the orthogonal property that satisfies multichannel sign indicating number sequence, and the demands such as MAI interference between the minimizing multichannel, in the running time-frequency resource that distributes, finish sequence allocation.

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