CN101005471B - Method, device and system for distributing pilot frequency channel time frequency source of multiple carrier communication system - Google Patents

Abstract

The method comprises: with a calculation in general finite field- GF (pm), one pseudo random sequence generates multi sequences in which there are multi orthogonal sequences composing a sequence set; each sequence in the sequence set generates a time-frequency pattern of pilot frequency channel; the generated time-frequency patterns are allocated to different cells, or the time-frequency resources of pilot frequency channel are allocated by users. By the invention, the interference of neighboring cells to the pilot frequency channel can be reduced.

Description

Pilot frequency channel time frequency source of multiple carrier communication system resource allocation methods, Apparatus and system

Technical field

The present invention relates to communication technical field, be specifically related to a kind of pilot frequency channel time frequency source of multiple carrier communication system resource allocation methods, device and application.

Background technology

For the communication system of high data rate, adopt the coherent demodulation mode to obtain desirable receptivity usually.So-called coherent demodulation is meant after modulated signal and coherent carrier multiply each other, obtains primary signal after low-pass filtering.The realization of coherent demodulation needs receiving terminal to know certain channel information, such as, the time domain of channel or frequency domain response.For this reason, need carry out channel estimating at receiving terminal, the receiving sequence that has produced the distortion and the white Gauss noise that superposeed according to the channel influence that receives on amplitude and phase place picks out channel time domain or frequency domain transmission characteristic.

In the high-speed radiocommunication system of OFDM (OFDM), data are parallel transmission on different orthogonal sub-carriers, and therefore, channel estimating will estimate the frequency response values of each subcarrier upper signal channel.The general mode that supplementary is arranged that adopts of the channel estimating of ofdm system promptly sends the known pilot signal of some receiving terminals at transmitting terminal, and receiving terminal utilizes these pilot signals to carry out channel estimating according to certain algorithm.

The pilot signal of ofdm system constitutes pilot channel with the form of time-frequency two-dimensional pattern.Utilize pilot frequency design to carry out channel estimating and comprise two steps: at first, obtain the frequency response sampled value of channel on different time and frequency by pilot sub-carrier; Then, between these sample values, carry out frequency domain and time domain interpolation, finally obtain the channel estimation value on the whole time-frequency plane.

In the cellular communication system based on OFDM, the OFDM pilot signal shows as up with the road pilot tone that down public guide frequency that base station in the sub-district sends and each user send.Be that different districts takies identical frequency resource under one the situation at frequency duplex factor as one, the interference that pilot channel is subjected to adjacent sub-district homogenous frequency signal can influence the accuracy of channel estimating, thereby reduces the receptivity of terminal.

Generally, the signal power of pilot channel will be higher than the signal power of other physical channel, if the pilot channel of neighbor cell adopts identical time-frequency two-dimensional pilot pattern, then pilot channel can be subjected to the strong jamming of adjacent district pilots channel.In order to reduce the adjacent presence of intercell interference that pilot channel is subjected to, guarantee performance for estimating channel, can distribute the different quadratures (not having intersection point) or the pilot frequency design of accurate quadrature (the intersection point number is limited) for the pilot channel of different districts.

Disclose the method that a kind of k of utilization rank multinomial generates the limited integer sequence of one group of intersection point number among patent application PCT/CN2005/000859, each sequence is corresponding to generate a frequency patterns.The generator polynomial of sequence can be expressed as:

$x\left(i\right)=p[a\left(i\right)]=\underset{j=0}{\overset{k}{\mathrm{\Σ}}}{n}_j{[a\left(i\right)]}^j---\left(1\right)$

Wherein, parameter a (i) is a certain sequence that is produced by finite field gf (Q).A (i) has following three kinds of forms:

A)a(i)＝i， i＝0，1，2，...，Q-1；(2)

Q is a prime number,

n _K-1It is determined value;

Every other parameter n _jGet all over the value among the GF (Q);

B)a(i)＝i， i＝0，1，2，...，Q-2；(3)

Q＝p ^m；

n ₁It is determined value;

Every other parameter n _jGet all over the value among the GF (Q);

C) $a\left(i\right)=\left\{\begin{array}{cc}1/i,& i=\mathrm{1,2},...,Q-1\\ 0,& i=0\end{array}\right.,---\left(4\right)$

Q is a prime number,

All parameter n _jGet all over the value among the GF (Q).

After the GF (Q) that generates a (i) and k are selected, change n _j, just having generated one group of sequence, the sequence number is Q ^K+1, maximum intersection point numbers are k between the sequence.

In the prior art, also have a kind of PN of utilization (pseudo random sequence) sequence (by 1 and 0 binary code sequence that constitutes) to generate the method for pilot frequency design.Because the PN sequence has good auto-correlation and their cross correlation, the frequency offset amount of pilot signal is determined according to a certain specific PN sequence in each sub-district, and the probability that the pilot frequency design of generation is collided mutually is very little, to reduce the adjacent area interference that pilot channel is subjected to.It is implemented as follows:

(1) generates the PN sequence.

The shift register that generates the PN sequence as shown in Figure 1, this shift register is 13 grades.[1 P ₁₁P ₀] be the initial condition of shift register.

(2) be the different [P of each cell allocation ₁₁P ₀], i.e. the initial condition difference of shift register.

(3) in each sub-district, with per 13 the output bit value corresponding of PN sequence generator to a certain special frequency band width (subcarrier number) delivery, with the numerical value behind the delivery as the frequency offset of pilot signal in the OFDM symbol of its place.

This method that (every 13) intercepting generates the PN sequence fragment of pilot offset in the fixed position does not make full use of the auto-correlation and the cross correlation of PN sequence, and the patterns available pattern data amount of generation is limited.

Summary of the invention

The purpose of this invention is to provide a kind of pilot frequency channel time frequency source of multiple carrier communication system resource allocation methods, make the shortcoming that the patterns available number of patterns is limited to overcome mode that PN sequence fragment that prior art generates pilot offset in fixed position intercepting generates the patterns available pattern, generate more mutually orthogonal or pilot frequency design that the intersection point number is limited.

Another object of the present invention provides a kind of pilot frequency channel time frequency source of multiple carrier communication system resource allocation device, to generate more mutually orthogonal or pilot frequency design that the intersection point number is limited in multi-carrier communications systems, improves systematic function.

Another object of the present invention provides a kind of orthogonal frequency division multiplex ransmitting and penetrates system, to obtain better system performance.

For this reason, the invention provides following technical scheme:

A kind of pilot frequency channel time frequency source of multiple carrier communication system resource allocation methods said method comprising the steps of:

A, by finite field gf (p ^m) interior computing, generate a plurality of sequences by a pseudo random sequence, comprising a plurality of mutually orthogonal sequences, the composition sequence set;

B, generate a time-frequency pattern of pilot frequency channel by each sequence in the described arrangement set;

C, the frequency patterns that generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

Described steps A comprises:

The shift register that a given m level has linear feedback is as pseudo-random sequence generator, and establishes described shift register state sometime and be $\stackrel{\→}{a}=(a_0,{,}_1,...,a_{m-1}),$ Generate described arrangement set as follows:

$f\left(i\right)=n_0+\underset{j=1}{\overset{z}{\mathrm{\Σ}}}{\left[n_{j}x\left(i\right)\right]}^j,$ I=0,1,2 ..., 2 ^m-2, z is less than 2 greater than zero ^mInteger, wherein,

X (i) is finite field gf (p ^m) interior multinomial

d _lThe sequence that ∈ [0,1] forms, and obtain in the following manner: any given x (0), then x (i)=X ^Ik[x (0)] modg (X), k=0,1,2 ... 2 ^m-2, wherein, g (X)=X ⁿ+ c _N-1X ^N-1+ ...+c ₁X+c ₀, be the generator polynomial of described pseudo-random sequence generator;

n _j, j=0,1 .., z are finite field gf (p ^m) in unit;

By n _jThe combination of different values, correspondingly generate different sequence f (i), composition sequence set.

As fixing n _j, the value of j ≠ 0 changes n ₀Value, the then corresponding sequence that generates is mutually orthogonal.

n _jX (i) is expressed as finite field gf (p ^m) in multinomial be n _j(X) x (i) modg (X).

Described step B comprises:

With the multinomial among the sequence f (i)

Act on described given buffer status

Obtain the sequence formed by different buffer status:

Wherein,

The expression pseudo-random sequence generator is from state

Bring into operation state in l backward shift register, add operation is finite field gf (p ^m) interior computing.

R (i) is mapped as the nonnegative integer sequence $s\left(i\right)=r_0^i{p}^{m-1}+r_1^i{p}^{m-2}+...+r_{m-1}^i,$ P is finite field gf (p ^m) unit;

In time-frequency plane, determine i j interior pilot sub-carrier place frequency domain position of orthogonal frequency division multiplex OFDM symbol that is inserted with pilot tone as follows:

p(i，j)＝(j-1)M+mod(s(i)，M)，

Wherein, and mod (s (i), M) expression s (i) is to the M delivery, and M is the frequency domain interval of adjacent pilot frequencies subcarrier in the OFDM symbol.

Described step C comprises:

C1, to different districts or the different frequency patterns of user's fixed allocation;

C2, according to the frequency patterns of distributing each sub-district or user are carried out the time-frequency resource allocating of pilot channel.Alternatively, described step C1 is specially:

According to systems organization, fixing different frequency patterns are distributed in different sub-districts or user.

Alternatively, described step C1 is specially:

At each Transmission Time Interval, choose different frequency patterns according to each sub-district or user's scrambler sequence.

A kind of pilot frequency channel time frequency source of multiple carrier communication system resource allocation device comprises:

The arrangement set generation unit is used to generate a plurality of quadratures or the limited sequence composition sequence set of intersection point number;

The pilot frequency design generation unit is coupled in described arrangement set generation unit, is used for generating the time-frequency pattern of pilot frequency channel corresponding with each sequence of this arrangement set according to described arrangement set;

The pilot frequency design allocation units are coupled in described pilot frequency design generation unit, are used for the frequency patterns that described pilot frequency design generation unit generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

Described arrangement set generation unit comprises:

Pseudo-random sequence generator is used to produce pseudo random sequence, and described pseudo-random sequence generator is the shift register that has linear feedback;

The sequence computation subunit is used for going out required sequence according to the state computation of described shift register.

A kind of orthogonal frequency division multiplex ransmitting is penetrated system, comprising:

The time-frequency resource allocating device is used to distribute different districts or user to carry out the running time-frequency resource of pilot channel;

Pilot tone and data multiplex equipment, be used for each sub-district or user need that pilot transmitted signal and data-signal be multiplexed into that described pilot frequency channel time frequency source resource allocation device determines to should the sub-district or the running time-frequency resource of user's pilot channel in;

Reflector is used to handle the signal that described pilot tone and data multiplex equipment are sent, and this signal is sent.

Described time-frequency resource allocating device comprises:

The arrangement set generation unit is used to generate the set of a plurality of quadratures or quasi-orthogonal sequence composition sequence;

The pilot frequency design generation unit is coupled in described arrangement set generation unit, is used for generating the time-frequency pattern of pilot frequency channel corresponding with each sequence of this arrangement set according to described arrangement set;

The pilot frequency design allocation units are coupled in described pilot frequency design generation unit, are used for the frequency patterns that described pilot frequency design generation unit generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel;

Described arrangement set generation unit comprises:

Pseudo-random sequence generator is used to produce pseudo random sequence, and described pseudo-random sequence generator is the shift register that has linear feedback;

The sequence computation subunit is used for according to the required sequence of the state computation of described shift register.

By above technical scheme provided by the invention as can be seen, the present invention has made full use of the auto-correlation and the their cross correlation of PN sequence, utilize a certain PN sequence, by it is calculated corresponding one group of mutually orthogonal sequence or the less sequence of intersection point number of generating in finite field, the composition sequence set, and utilize sequence in the arrangement set to generate more mutually orthogonal or pilot frequency design that the intersection point number is limited, the corresponding frequency patterns that generates of each sequence in this arrangement set is distributed to the time-frequency resource allocating that pilot channel is carried out in different sub-districts, thereby can reduce the probability that pilot channel is subjected to adjacent area interference effectively, improve systematic function.The present invention generates the mode simple and flexible of a plurality of mutually orthogonal or accurate orthogonal sequences.

Description of drawings

Fig. 1 is a PN sequence generator schematic diagram in the prior art;

Fig. 2 is an OFDM time-frequency two-dimensional floor map;

Fig. 3 is the realization flow figure of the inventive method;

Fig. 4 is a m level PN sequence generator schematic diagram;

Fig. 5 is 5 grades of PN sequence generator schematic diagrames;

Fig. 6 is apparatus of the present invention theory diagrams;

Fig. 7 is a system principle diagram of the present invention.

Embodiment

Core of the present invention is to utilize the auto-correlation and the their cross correlation of PN (pseudo random sequence) sequence, utilize a certain PN sequence, by it is calculated corresponding one group of mutually orthogonal sequence or the less sequence of intersection point number of generating in finite field, the composition sequence set, and utilize sequence in the arrangement set to generate more mutually orthogonal or pilot frequency design that the intersection point number is limited, generate time-frequency pattern of pilot frequency channel for different sub-districts each sequence allocation in this arrangement set, the frequency patterns that generates is distributed to the time-frequency resource allocating that different sub-districts or user carry out pilot channel.

In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.

Reference OFDM time-frequency two-dimensional floor map shown in Figure 2:

Wherein, time-domain is the unit with an OFDM symbol, and frequency domain is the unit with the subcarrier.T is the adjacent time domain interval that pilot tone OFDM symbol is arranged, and M is the frequency domain interval of adjacent pilot frequencies subcarrier in the OFDM symbol.

The grid of being filled by grey among Fig. 2 represents to transmit the subcarrier of pilot signal, and all these subcarriers are formed a frequency patterns.As seen, if neighbor cell adopts different frequency patterns to carry out the pilot frequency channel time frequency source resource allocation, can avoid pilot channel to be subjected to the interference of adjacent sub-district high power signal, thereby guarantee performance for estimating channel.

With reference to Fig. 3, Fig. 3 shows the realization flow of the inventive method, may further comprise the steps:

Step 301: by finite field gf (p ^m) interior computing, generate a plurality of quadratures or quasi-orthogonal sequence by a pseudo random sequence, the composition sequence set.

Suppose that x (i) is the sequence that is generated by the PN sequence.Concrete generating mode is as follows:

If the PN sequence generator is the shift register that a m level has linear feedback, as shown in Figure 4.Its generator polynomial is expressed as:

g(X)＝X ⁿ+c _n-1X ^n-1+...+c ₁X+c ₀(5)

Certain state of given shift register is $\stackrel{\→}{a}=(a_0,a_1,...,a_{m-1}),$ It is in proper order: a ₀It is the state value of first register.

Definition finite field gf (p ^m) interior multinomial

(b _l∈ [0,1]) be the effect to this state, the state representation after the effect is:

Wherein,

Expression PN sequence generator is from state State in l backward shift register brings into operation.

Be provided with confinement GF (p ^m) an interior multinomial d ₀X ^M-1+ d ₁X ^M-2+ ...+d _M-1For to state

An effect, be defined as x (0), with state

Be set to the initial condition of PN sequence generator shift register.

With the PN sequence generator from initial condition entry into service k (k=0,1,2 ..., 2 ^m-2) inferior, the state correspondence in the shift register that then obtains act as X ^k[x (0)] modg (X)=[X ^k(d ₀X ^M-1+ d ₁X ^M-2+ ...+d _M-1)] modg (X), be defined as x (1);

Rerun k time, obtain in the shift register the state value correspondence act as X ^2k[x (0)] modg (X)=[X ^2k(d ₀X ^M-1+ d ₁X ^M-2+ ...+d _M-1)] modg (X), be defined as x (2);

The rest may be inferred, obtains sequence x (i)=[X ^Ik(d ₀X ^M-1+ d ₁X ^M-2+ ...+d _M-1)] modg (X), i=0,1,2 ..., 2 ^m-2.

To sequence x (i) at finite field gf (p ^m) in carry out as the formula (7) computing, formation sequence f (i).

$f\left(i\right)=n_0+\underset{j=1}{\overset{z}{\mathrm{\Σ}}}{\left[n_{j}x\left(i\right)\right]}^j---\left(7\right)$

Wherein, z is less than 2 greater than zero ^mInteger, parameter n _jBe finite field gf (p ^m) in unit.

n ₁It is n that x (i) is expressed as multinomial ₁(X) x (i) modg (X).

Therefore, f (i) has defined a set by the sequence of PN sequence generation, and works as fixedly n _j, j＞=1 changes n ₀The time, the sequence of generation is mutually orthogonal.

The sequence that further describes below in the set has good correlation.

At first for sequence x (i), i=0,1, according to the characteristic of pseudo random sequence, there is the equal probability of l x (i) in .., reduces along with the increase of l.Make z=1, suppose two different sequence f (i)=n ₀+ n ₁X (i) and sequence f ' (i)=n ' ₀+ n ' ₁X (i) has intersection point, then must satisfy f (i)=f ' (i), i.e. n ₀-n ' ₀+ (n ₁-n ' ₁) x (i)=0.Theory according to solution of equation in the finite field, the linear function of non-trivial has only one to separate at most, therefore have only a value y=x (i) to satisfy above-mentioned equation at most, therefore the number that satisfies the i of above-mentioned equation depends on the number of times that x (i)=y repeats, characteristic according to the PN sequence, the equal probability of l x (i) occurs, reduce along with the increase of l.Therefore all have good intersection point character by the sequence that f (i) generates.Intersection point number between them can be 0,1,2,3 ... individual, but the probability that occurs along with the number increase is more little.In like manner, when z＞1, the z equation of n th order n of corresponding non-trivial has only z to separate at most, and the sequence that is generated by f (i) still has good intersection point character.

Step 302: generate time-frequency pattern of pilot frequency channel by the sequence in the arrangement set.The corresponding frequency patterns of each sequence.

Multinomial among the sequence f (i) is acted on given buffer status $\stackrel{\→}{a}=(a_0,a_1,...,a_{m-1}),$ Obtain the sequence formed by different buffer status

Again r (i) is corresponded to the nonnegative integer sequence $s\left(i\right)=r_0^i{p}^{m-1}+r_1^i{p}^{m-2}+...+r_{m-1}^i,$ P is finite field gf (p ^m) unit.

In time-frequency plane, i j interior pilot sub-carrier place frequency domain position of OFDM symbol that is inserted with pilot tone can be expressed as:

p(i，j)＝(j-1)M+mod(s(i)，M)(8)

Wherein, and mod (s (i), M) expression s (i) is to the M delivery, and M is the frequency domain interval of adjacent pilot frequencies subcarrier in the OFDM symbol.

Work as M=p ⁿ, n can be any nonnegative integer less than m, modulo operation can be expressed as finite field gf (p ^m) in value be mapped to finite field gf (p ⁿ) in, be about to finite field gf (p ^m) in high n position be mapped to GF (p ⁿ), perhaps get finite field gf (p ^m) in low n position be mapped to GF (p ⁿ) in.

Step 303: the frequency patterns that generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

When distributing frequency patterns, can specify in advance according to systems organization for sub-district or user; Also can utilize specific sub-district or user's scrambler in the different time interval, to choose.Such as, when optional sequence had four, getting sub-district binary system scrambler sequence sometime at interval two determined according to its value corresponding (0,1,2,3) which sequence this sub-district chooses; In next time interval, utilize other two of scrambler to choose sequence.Different sub-district adopts different scramblers to choose sequence, and when available sequences quantity was big, at a time neighbor cell was chosen identical sequence to generate the probability of pilot frequency design very little.

Further describe the present invention below for example:

Suppose that the PN sequence generator is one 5 grades (m=5) shift registers, as shown in Figure 5.

The generator polynomial of shift register is g (X)=1+X ³+ X ⁵, the state in the given a certain moment of register is { a0, a1, a2, a3, a4}={0,1,0,1,1}.Setting is to a certain finite field gf (2 that act as of this state ⁵) in multinomial x (0)=1, then state a0, a1, a2, a3, a4}={0,1,0,1,1} is the initial condition of PN sequence generator.Make k=3, then sequence x (i)=X ³ⁱModg (X), i=0,1,2...2 ⁵-2=0,1,2 ..., 30.

According to formula (7), make z=1 again, i.e. f (i)=n ₀+ n ₁X (i).

At first, make n ₀, n ₁Get finite field gf (2 respectively ⁵) in multinomial be n ₀=0, n ₁=X generates new sequence x ' (i):

x′(i)＝Xx(i)

Make n again ₀, n ₁Get finite field gf (2 respectively ⁵) in multinomial be n ₀=X+1, n ₁=X generates another new sequence x " (i):

x″(i)＝(X+1)+Xx(i)

X (i) corresponding the state value r (i) of register as the i row of following matrix, the state value of first first output register of behavior of each row.

0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0

1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0

0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1

1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0

1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1

X ' (i) the state value r ' of corresponding register (i) as the i row of following matrix, the state value of first first output register of behavior of each row.

1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1

0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0

1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1

1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1?1

1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1

X " (i) the state value r of corresponding register " is (i) as the i row of following matrix, the state value of first first output register of behavior of each row.

1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1

0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1?0?0?1?1?0?0?0?0?1?0

1?0?0?1?1?0?0?0?0?1?0?1?1?0?1?0?1?0?0?0?1?1?1?0?1?1?1?1?1?0?0?1

0?0?1?0?0?0?0?0?1?1?0?1?1?0?0?1?1?1?1?0?1?0?0?1?0?1?0?1?1?1?0?1

0?0?1?0?1?0?1?1?1?0?0?0?1?0?0?0?0?0?1?1?0?1?1?0?0?1?1?1?1?0?1?1

Respectively with r (i), r ' (i), r " (i) correspond to integer field, obtain nonnegative integer sequence s (i), s ' (i), s is " (i)

s(i)＝[11291233125139822114221715286204110232724730192618165]。

s′(i)＝[232724730192618165112912331251398221142217152862041]

s″(i)＝[20242742916251719683015028261410111221321181231523729]。

As seen, sequence s ' (i), " be mutually orthogonal (i), and sequence s (i), s ' has only an intersection point between (i) to s.

Then, utilize sequence s (i), generate pilot frequency design.

Suppose that the pilot sub-carrier frequency domain interval is M=8, then i j interior pilot sub-carrier place frequency domain position of OFDM symbol that is inserted with pilot tone can be expressed as:

p(i，j)＝8(j-1)+mod(s(i)，8)

When being the cell allocation frequency patterns, can specify in advance according to systems organization.Also can utilize specific cell scrambling in the different time interval, to choose.Such as, when optional sequence had four, getting sub-district binary system scrambler sequence sometime at interval two determined according to its value corresponding (0,1,2,3) which sequence this sub-district chooses; In next time interval, utilize other two of scrambler to choose sequence.Different sub-district adopts different scramblers to choose sequence, and when available sequences quantity was big, at a time neighbor cell was chosen identical sequence to generate the probability of pilot frequency design very little.

Reference apparatus of the present invention theory diagram shown in Figure 6:

Wherein, arrangement set generation unit S1 is used to generate a plurality of quadratures or the set of quasi-orthogonal sequence composition sequence; Pilot frequency design generation unit S2 is coupled in described arrangement set generation unit, is used for generating the time-frequency pattern of pilot frequency channel corresponding with each sequence of this arrangement set according to described arrangement set; Pilot frequency design allocation units S3 is coupled in described pilot frequency design generation unit, is used for the frequency patterns that described pilot frequency design generation unit generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

Arrangement set generation unit S1 comprises: pseudo-random sequence generator S11, be used to produce pseudo random sequence, and described pseudo-random sequence generator is the shift register that has linear feedback; Sequence computation subunit S12 is used for according to the required sequence of the state computation of described shift register.

In sequence computation subunit S12, calculate the sequence that the finite field multinomial is formed according to formula (7), again the multinomial in the sequence is acted on pseudo-random sequence generator S11, generate different shift register states, again the state of shift register is mapped to the nonnegative integer sequence and outputs to pilot frequency design generation unit S2, by this unit generate with this arrangement set in the corresponding time-frequency pattern of pilot frequency channel of each sequence.

Fig. 7 is that orthogonal frequency division multiplex ransmitting of the present invention is penetrated system principle diagram:

Wherein, time-frequency resource allocating device S0 is used to distribute different districts or user to carry out the running time-frequency resource of pilot channel, and its principle does not repeat them here as shown in Figure 6.

Pilot tone and data multiplex equipment S4 be used for each sub-district or user need that pilot transmitted signal and data-signal be multiplexed into that described pilot frequency channel time frequency source resource allocation device determines to should the sub-district or the running time-frequency resource of user's pilot channel in;

Reflector S5 is used to handle the signal that described pilot tone and data multiplex equipment are sent, and this signal is sent.

By above embodiment as seen, the present invention has made full use of the auto-correlation and the cross correlation of PN sequence, can generate a fairly large number of quadrature or quasi-orthogonal pilot frequency design, thereby can distribute different quadrature or quasi-orthogonal pilot frequency design for the pilot channel of different districts, reduced of the interference of adjacent sub-district, guaranteed performance for estimating channel pilot channel.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.

Claims (8)

1. a pilot frequency channel time frequency source of multiple carrier communication system resource allocation methods is characterized in that, said method comprising the steps of:

A, by finite field gf (p ^m) interior computing, generate a plurality of sequences by a pseudo random sequence, comprising a plurality of mutually orthogonal sequences, the composition sequence set specifically comprises:

The shift register that a given m level has linear feedback is as pseudo-random sequence generator, and establishes described shift register state sometime and be $\stackrel{\→}{a}=(a_0,a_1,...,a_{m-1}),$ Generate described arrangement set as follows: $f\left(i\right)=n_0+\underset{j=1}{\overset{z}{\mathrm{\Σ}}}{\left[n_{j}x\left(i\right)\right]}^j,$ I=0,1,2 ..., 2 ^m-2, z is less than 2 greater than zero ^mInteger, wherein, x (i) is finite field gf (p ^m) interior multinomial

d _lThe sequence that ∈ [0,1] forms, and obtain in the following manner: any given x (0), then x (i)=X ^Ik[x (0)] mod g (X), k=0,1,2 ... 2 ^m-2, wherein, g (X)=X ⁿ+ c _N-1X ^N-1+ ...+c ₁X+c ₀Generator polynomial for described pseudo-random sequence generator; n _j, j=0,1 ..., z is finite field gf (p ^m) in unit;

By n _jThe combination of different values, correspondingly generate different sequence f (i), composition sequence set;

B, generate a time-frequency pattern of pilot frequency channel, specifically comprise by each sequence in the described arrangement set:

With the multinomial among the sequence f (i)

Act on given buffer status

Obtain the sequence formed by different buffer status:

, wherein, The expression pseudo-random sequence generator is from state

Bring into operation state in l backward shift register, add operation is finite field gf (p ^m) interior computing;

R (i) is mapped as the nonnegative integer sequence $s\left(i\right)=r_0^i{p}^{m-1}+r_1^i{p}^{m-2}+...+r_{m-1}^i,$ P is finite field gf (p ^m) unit;

In time-frequency plane, determine i j interior pilot sub-carrier place frequency domain position: p (i of orthogonal frequency division multiplex OFDM symbol that is inserted with pilot tone as follows, j)=(j-1) M+mod (s (i), M), wherein, mod (s (i), M) expression s (i) is to the M delivery, and M is the frequency domain interval of adjacent pilot frequencies subcarrier in the OFDM symbol;

C, the frequency patterns that generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

2. method according to claim 1 is characterized in that, as fixing n _j, the value of j ≠ 0 changes n ₀Value, the then corresponding sequence that generates is mutually orthogonal.

3. method according to claim 1 is characterized in that n _jX (i) is expressed as finite field gf (p ^m) in multinomial be n _j(X) x (i) mod g (X).

4. method according to claim 1 is characterized in that, described step C comprises:

C1, to different districts or the different frequency patterns of user's fixed allocation;

C2, according to the frequency patterns of distributing each sub-district or user are carried out the time-frequency resource allocating of pilot channel.

5. method according to claim 4 is characterized in that, described step C1 is specially:

According to systems organization, fixing different frequency patterns are distributed in different sub-districts or user.

6. method according to claim 4 is characterized in that, described step C1 is specially:

At each Transmission Time Interval, choose different frequency patterns according to each sub-district or user's scrambler sequence.

7. a pilot frequency channel time frequency source of multiple carrier communication system resource allocation device is characterized in that, comprising:

The arrangement set generation unit is used to generate a plurality of quadratures or the limited sequence composition sequence set of intersection point number, and described arrangement set generation unit comprises: pseudo-random sequence generator and sequence computation subunit;

Described pseudo-random sequence generator is used to produce pseudo random sequence for the m level has the shift register of linear feedback;

Described sequence computation subunit is used for going out required sequence according to the state computation of described shift register, specifically comprises: establishing described shift register state sometime is $\stackrel{\→}{a}=(a_0,a_1,...,a_{m-1}),$ Generate described arrangement set as follows: $f\left(i\right)=n_0+\underset{j=1}{\overset{z}{\mathrm{\Σ}}}{\left[n_{j}x\left(i\right)\right]}^j,$ I=0,1,2 ..., 2 ^m-2, z is less than 2 greater than zero ^mInteger, wherein, x (i) is finite field gf (p ^m) interior multinomial

d _lThe sequence that ∈ [0,1] forms, and obtain in the following manner: any given x (0), then x (i)=X ^Ik[x (0)] mod g (X), k=0,1,2 ... 2 ^m-2, wherein, g (X)=X ⁿ+ c _N-1X ^N-1+ ...+c ₁X+c ₀Generator polynomial for described pseudo-random sequence generator; n _j, j=0,1 .., z are finite field gf (p ^m) in unit; By n _jThe combination of different values, correspondingly generate different sequence f (i), composition sequence set;

With the multinomial among the sequence f (i)

Act on given buffer status

Obtain the sequence formed by different buffer status:

, wherein, The expression pseudo-random sequence generator is from state

Bring into operation state in l backward shift register, add operation is finite field gf (p ^m) interior computing;

R (i) is mapped as the nonnegative integer sequence $s\left(i\right)=r_0^i{p}^{m-1}+r_1^i{p}^{m-2}+...+r_{m-1}^i,$ P is finite field gf (p ^m) unit;

The pilot frequency design generation unit is coupled in described arrangement set generation unit, is used for

In time-frequency plane, determine i j interior pilot sub-carrier place frequency domain position: p (i of orthogonal frequency division multiplex OFDM symbol that is inserted with pilot tone as follows, j)=(j-1) M+mod (s (i), M), wherein, mod (s (i), M) expression s (i) is to the M delivery, and M is the frequency domain interval of adjacent pilot frequencies subcarrier in the OFDM symbol;

The pilot frequency design allocation units are coupled in described pilot frequency design generation unit, are used for the frequency patterns that described pilot frequency design generation unit generates is distributed to the time-frequency resource allocating that different districts or user carry out pilot channel.

8. an orthogonal frequency division multiplex ransmitting is penetrated system, comprising:

The time-frequency resource allocating device is used to distribute different districts or user to carry out the running time-frequency resource of pilot channel;

Pilot tone and data multiplex equipment, be used for each sub-district or user need that pilot transmitted signal and data-signal be multiplexed into that described pilot frequency channel time frequency source resource allocation device determines to should the sub-district or the running time-frequency resource of user's pilot channel in;

Reflector is used to handle the signal that described pilot tone and data multiplex equipment are sent, and this signal is sent.

It is characterized in that,

Described time-frequency resource allocating device is the described pilot frequency channel time frequency source of multiple carrier communication system resource allocation device of claim 7.

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