CN102026219B - Method and corresponding device for generating and transmitting wireless channel measurement reference signal - Google Patents

Abstract

The invention relates to a method for generating a wireless channel measurement reference signal, which is used for a multifrequency wave communication system. In the method, a first subsequence and a second subsequence are selected according to reference signal sequence length NSeq, wherein, NSeq=N1+N2, N1 is the length of the first subsequence, N2 is the length of the second subsequence, R=N1/N2, Nseq, N1, N2 and R are natural numbers, and the length is represented by bit numbers; and signal reference sequence is generated according to the first subsequence and the second subsequence, wherein R numbered bits among the [i(R+1)]th-[i(R+1)+R]th bits of the signal reference sequence are the (i.R)th-(i.R+R-1)th bits of the first subsequence, the rest one bit is the i-th bit of the second subsequence, i is equal to 0,1,...,M2-1, and when the values of i are different, the relative positions of the one bit and the R numbered bits are fixed. In the invention, when limiting factors exist in the reference signal sequence, the original mean ratio performance of the sequences can be well kept.

Description

A kind of generation of wireless channel measurement reference signal, sending method and related device

Technical field

The present invention relates to the communications field, particularly, relate to generation, sending method and the device of wireless channel measurement reference signal.

Background technology

Channel measurement is the requisite part of communication system, as use the wireless communication system of OFDM (OFDM:Orthogonal Frequency Division Multiplexing) and/or MIMO (Multiple InputMultiple Output, multiple-input and multiple-output) technology.Present communication system is generally used reference signal, and namely pilot tone, be used for channel measurement.The called reference signal refers to itself not carry user data information, and is used for the signal of estimating user data place channel or other channel parameters.In the MIMO-OFDM system, need the situation (i.e. feedback) of receiving terminal report wireless channel, adjust the sending strategy of signal to facilitate transmitting terminal, improve the performance of system.At present the reference signal in system mainly contains: general pilot, dedicated pilot, leading, intermediate pilot and Sounding (without general middle translation) signal.

Intermediate pilot refers to: in the MIMO-OFDM system, take the reference signal of an OFDM symbol in a downlink radio resource frame.So-called descending, refer to that wireless signal sends to user terminal from the base station.The Sounding signal refers to: in the MIMO-OFDM system, take the reference signal of an OFDM symbol in the ascending wireless resource frame.So-called up, refer to that wireless signal sends to the base station from user terminal.The channel content that needs to measure mainly comprises order information (RI, Rank Information), channel quality information (CQI, Channel Quality Information) and pre-coding matrix sequence number (PMI, Preferred Matrix Index).

The base station numbering sum that uses in the number of reference signal sequence and communication system is relevant, if but corresponding independent pilot frequency sequence of each numbering, need larger memory space in terminal, by constructing two sub-arrangement sets, then respectively select respectively a subsequence and can reduce memory space according to certain rule composition pilot frequency sequence from two sub-arrangement sets.Simultaneously, due to ofdm system itself, powerful situation can appear in the transmitting terminal signal, even surpasses the linear working range of transmitting terminal power amplifier, causes the distortion of signal and affects the effect of channel measurement.

Therefore, need to select the low sequence of power PAR (PAPR), reduce the time domain power peak of reference signal, in order to promote reference signal with respect to the power of data-signal, increase the accuracy of channel measurement.Present existing sequence or sequence pair, as the Golay sequence, peak-to-average force ratio is not more than 2.But in specific communication system, the applicable elements of these sequences can not satisfy usually, and such as expanding carrying out brachymemma or (by conversion) single sequence or sequence according to available sub-carrier number, the character of sequence can be destroyed.When sending pilot frequency sequence, need to adopt rational multiplex mode to avoid the interference of neighbor cell, improve the accuracy of channel measurement, also will avoid (being mainly leading, preamble) obscuring with other reference signals.So-called subcarrier mapping refers to that a data (as sequence) are put on the subcarrier of frequency domain symbol correspondingly.How to consider these limiting factor design pilot frequency sequences, rational solution is not yet arranged at present.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of generation method of wireless channel measurement reference signal, when there are some limiting factors in reference signal sequence, also can keep preferably the character of the original peak-to-average force ratio of these sequences.

In order to address the above problem, the invention provides a kind of generation method of wireless channel measurement reference signal, be used for the multi-frequency waves communication system, this generation method comprises:

According to the reference signal sequence length N _SeqSelect one first subsequence and one second subsequence, and N is arranged _Seq=N ₁+ N ₂, N ₁Be the length of the first subsequence, N ₂Be the length of the second subsequence, R=N ₁/ N ₂, N _seq, N ₁, N ₂, R is natural number, described length represents with bit number;

According to described the first subsequence and the second subsequence generating reference signal sequence, there be R bit to be the iR of this first subsequence～iR+R-1 bit in this reference signal sequence i (R+1)～i (R+1)+R bit, all the other 1 bits are i the bit of this second subsequence, i=0,1,, N ₂-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed.

Further, above-mentioned generation method also can have following characteristics:

Described N _SeqDetermine according to following formula: N _Sc=N _Dec* N _Seq+ N ₀, wherein, N _ScBe the subcarrier number that reference signal sequence can be used, N _DecBe natural number, N ₀Integer, 0≤N ₀＜N _Dec

And, N ₁And N ₂Value follow following agreement:

${\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">N</figure-callout>}}_1=2^{{\mathrm{\&alpha;}}_1}{10}^{{\mathrm{\&beta;}}_1}{26}^{{\mathrm{\&gamma;}}_1},$ ${\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">N</figure-callout>}}_2=2^{{\mathrm{\&alpha;}}_2}{10}^{{\mathrm{\&beta;}}_2}{26}^{{\mathrm{\&gamma;}}_2}$

Wherein, α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂〉=0, α ₁〉=α ₂

Further, above-mentioned generation method also can have following characteristics: the formula during according to described the first subsequence and the second subsequence generating reference signal sequence is as follows:

Wherein,

Be the reference signal sequence that will generate,

Be the first subsequence, from the first subsequence set ${\mathrm{<figure-callout\; id="1"\; label="G"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">G</figure-callout>}}_1=\{{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{1,0}},<figure-callout\; id="1"\; label="...\; g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">.</figure-callout>..g_{}{}_{1,{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1}...,{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>}}_{1,M_1-1}\}$ Select, Be the second subsequence, from the second subsequence set ${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">G</figure-callout>}}_2=\{{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{2,0}},<figure-callout\; id="2"\; label="...\; g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">.</figure-callout>..g_{}{}_{2,{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">m</figure-callout>}}_2}...,{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2,M_2-1}\}$ Select m ₁=0,1 ..., M ₁-1, m ₂=0,1 ..., M ₂-1, M ₁, M ₂Be respectively G ₁, G ₂In the subsequence number that comprises, L=R+1, m=0,1 ..., N _Seq-1, m ₀Integer, and 0≤m ₀≤ R, subscript g (m ₁, m ₂) be m ₁, m ₂Function, mod (x, y)=xmody, the expression modular arithmetic.

Further, above-mentioned generation method also can have following characteristics:

Described g (m ₁, m ₂) equaling Cell_ID, Cell_ID is that the sequence number of base station, sector or residential quarter has:

m ₁＝Cell_ID _b(m′:1)，m ₂＝Cell_ID _b(m″:m′+1)

Wherein, Cell_ID _bThe binary representation of Cell_ID, Cell_ID _b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM ' to the 1st, Cell_ID _b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM " to m '+1, m ', m " being natural number, m '＜m ", M ₁=2 ^m', M ₂=2 ^{M " m '}

Further, above-mentioned generation method also can have following characteristics: m ₀=0, R or R/2.

Further, above-mentioned generation method also can have following characteristics: described the first subsequence and the second subsequence are the Golay complementary series.

Further, above-mentioned generation method also can have following characteristics: described reference signal is intermediate pilot or Sounding signal.

Further, above-mentioned generation method also can have following characteristics:

The subcarrier number N that described communication system is supported _FFT512 multiple, the sub-carrier number N that reference signal can be used _Sc=432 * [1+log ₂(N _FFT/ 512)];

N _DecThe placement interval of expression reference signal when frequency domain is uniformly-spaced placed represents N with sub-carrier number _DecBe a fixed value or the N between 0～9 _Dec=3 * N _t, N _tNumber of transmit antennas for the dispensing device configuration that sends reference signal;

At definite N ₁, N ₂The time, make β ₁, γ ₁, β ₂, γ ₂Be 0, M ₁=8,16 or 32, M ₂=8,16 or 32.

Such scheme uses the pilot frequency sequence of the identical or not identical subsequence of two length (or sequence to) configurations, compare existing program, can be applicable to more application scenarios, in some limiting factors that exist in satisfying pilot frequency sequence (as sequence is carried out brachymemma or expansion), the character that can keep preferably these subsequence low peak average ratios is conducive to measure exactly channel and feed back.

The another technical problem that the present invention will solve is to provide a kind of generation and sending method and device of wireless channel measurement reference signal, can keep the character of subsequence low peak average ratio, and makes a distinction with the targeting signal of wireless communication system.

In order to address the above problem, the invention provides a kind of generation and sending method of wireless channel measurement reference signal, be used for multi-carrier communications systems, this sending method comprises:

Generate the reference signal sequence that will send according to the generation method of above-mentioned arbitrary wireless channel measurement reference signal;

Dispensing device equally spaced is mapped on frequency domain on all available subcarriers except the direct current subcarrier with reference to burst or to the sequence that obtains after this reference signal sequence conversion, obtain the frequency domain reference signal, send after this frequency domain reference signal is transformed to time-domain symbol.

Further, above-mentioned generation and sending method also can have following characteristics:

Described dispensing device is mapped to for subcarrier corresponding to the symbol of transmission of reference signals with reference to burst by following formula:

Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on subcarrier,

Be Function;

Expression is not more than the maximum integer of x, k ₀Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N _UsedIt is the available sub-carrier number that comprises the direct current subcarrier.

Further, above-mentioned generation and sending method also can have following characteristics:

$f\left[G_{g({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1,m_2)}\left(m\right)\right]=1-2*G_{\mathrm{Cell}\_\mathrm{ID}}\left(m\right)$

Wherein, Cell_ID is the sequence number of base station, sector or residential quarter, k ₀A kind of in the following manner comes value:

The first, k ₀=n _t-1;

The second, k ₀For satisfying the value of following two conditions:

Wherein, k ₀=0,1 ..., 8, n is frame number, BRO (x, 3) is the inverted order of 3 bit x;

The third, k ₀For satisfying the value of following condition:

k ₀＝n _t-1+mod(Cell_ID，3)×N _Dec

Above various in, N _tBe the number of transmit antennas of described dispensing device configuration, n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

Correspondingly, the generation of wireless channel measurement reference signal provided by the invention and dispensing device comprise:

Subsequence provides module, is used for providing the first subsequence set ${\mathrm{<figure-callout\; id="1"\; label="G"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">G</figure-callout>}}_1=\{{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{1,0}},<figure-callout\; id="1"\; label="...\; g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">.</figure-callout>..g_{}{}_{1,{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1}...,{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>}}_{1,M_1-1}\}$ With the second subsequence set ${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">G</figure-callout>}}_2=\{{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{2,0}},<figure-callout\; id="2"\; label="...\; g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">.</figure-callout>..g_{}{}_{2,{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">m</figure-callout>}}_2}...,{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2,M_2-1}\},$ G ₁In comprise M ₁Individual length is N ₁The first subsequence, G ₂In comprise M ₂Individual length is M ₂The second subsequence, m ₁=0,1 ..., M ₁-1, m ₂=0,1 ..., M ₂-1, N _SeqBe the length of reference signal sequence, R=N ₁/ N ₂, N _seq, N ₁, N ₂, R is natural number, length represents with bit number;

Subsequence is selected module, is used for selecting one first subsequence from the first subsequence set

Select one second subsequence from the second subsequence set

The sequence generation module is used for basis

With

The generating reference signal sequence has R bit to be in this reference signal sequence i (R+1)～i (R+1)+R bit

An iR～iR+R-1 bit, all the other 1 bits are I bit, i=0,1 ..., N ₂-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed;

The sequence sending module, be used for the reference signal sequence that will generate or the sequence that obtains after this reference signal sequence conversion equally spaced is mapped to all available subcarriers except the direct current subcarrier on frequency domain, obtain the frequency domain reference signal, then send after transforming to time-domain symbol.

Further, said apparatus also can have following characteristics:

Described subsequence provides the first subsequence that module provides and the length N of the second subsequence ₁, N ₂Value follow following agreement:

${\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">N</figure-callout>}}_1=2^{{\mathrm{\&alpha;}}_1}{10}^{{\mathrm{\&beta;}}_1}{26}^{{\mathrm{\&gamma;}}_1},$ ${\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">N</figure-callout>}}_2=2^{{\mathrm{\&alpha;}}_2}{10}^{{\mathrm{\&beta;}}_2}{26}^{{\mathrm{\&gamma;}}_2}$

Wherein, α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂〉=0, α ₁〉=α ₂, and N is arranged _Sc=N _Dec* N _Seq+ N ₀, N _ScBe the subcarrier number that reference signal sequence can be used, N _DecBe natural number, the expression placement interval of reference signal when frequency domain is uniformly-spaced placed, N ₀Integer, 0≤N ₀＜N _Dec

Described sequence generation module basis

With

The generating reference signal sequence The time formula as follows:

Wherein, L=R+1, m=0,1 ..., N _Seq-1, m ₀Integer, and m ₀=0, R or R/2, subscript g (m ₁, m ₂) be m ₁, m ₂Function, mod (x, y)=xmod y, the expression modular arithmetic.

Further, said apparatus also can have following characteristics:

Described subsequence selects module to select from the first subsequence set and the second subsequence set according to following formula

With

m ₁＝Cell_ID _b(m′:1)，m ₂＝Cell_ID _b(m″:m′+1)

Wherein, Cell_ID _bThe binary representation of Cell_ID, described g (m ₁, m ₂) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or residential quarter, Cell_ID _b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM ' to the 1st, Cell_ID _b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM " to m '+1, m ', m " being natural number, m '＜m ", M ₁=2 ^m', M ₂=2 ^{M " m '}

Further, said apparatus also can have following characteristics:

Described sequence sending module is mapped to for subcarrier corresponding to the symbol of transmission of reference signals with reference to burst by following formula:

Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on subcarrier,

Expression is not more than the maximum integer of x, k ₀Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N _UsedBe the available sub-carrier number that comprises the direct current subcarrier, Cell_ID is the sequence number of base station, sector or residential quarter, k ₀A kind of in the following manner comes value:

The first, k ₀=n _t-1;

The second, k ₀For satisfying the value of following two conditions:

Wherein, k ₀=0,1 ..., 8, n is frame number, BRO (x, 3) is the inverted order of 3 bit x;

The third, k ₀For satisfying the value of following condition:

k ₀＝n _t-1+mod(Cell_ID，3)×N _Dec

Above various in, N _tBe the number of transmit antennas of described dispensing device configuration, n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

Further, said apparatus also can have following characteristics:

It is the Golay complementary series that described subsequence provides the first subsequence and the second subsequence that module provides; Described sequence sending module sends described reference signal sequence as intermediate pilot or Sounding signal.

The pilot frequency sequence that such scheme sends, compare existing program, the character that can keep the subsequence low peak average ratio, because Sequence is multiplexing, has lower memory space, and these subcarrier mapping modes can avoid time domain periodic signal to occur, thereby can make a distinction with other reference signals of wireless communication system (being mainly leading).Further, be set to reduce area interference for transmission intermediate pilot sequence by the part available subcarrier that satisfies the such scheme condition, improve the accuracy of channel estimating.

Description of drawings

Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, jointly is used for explaining the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of time domain OFDM symbol.

Fig. 2 is R=2, m ₀The schematic diagram of the reference signal sequence constructive method of=2 o'clock.

Fig. 3 is two couples of k of the embodiment of the present invention ₀=1, N _Dec=3, N _Used=433, N _FFTThe schematic diagram of the reference signal subcarrier mapping pattern of=512 o'clock certain antennas.

Fig. 4 is the schematic diagram of the cumulative distribution function (CDF) of the sequence peak-to-average force ratio that consists of of table 1, obtains by emulation experiment.

Fig. 5 is before the Golay sequence mapping of 3096 128 bits and the contrast of the PAPR after mapping, obtains by emulation experiment, and CDF represents cumulative distribution function, N1/N2=2.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.

In embodiments of the present invention, reference signal refers to intermediate pilot or Sounding signal, but the present invention is not limited to this.The intermediate pilot distribution of carriers is on whole OFDM symbol.Intermediate pilot is used for terminal and carries out channel measurement, in order to obtain the down channel coefficient, at open loop MIMO (Multi Input MultiOutput, multiple-input and multiple-output) in, intermediate pilot can be used for channel quality indication (Channel QualityIndication is referred to as CQI) to be estimated, in closed-loop MIMO, intermediate pilot can be used for the calculating of pre-coding matrix sequence number (Preferred Matrix Index, PMI).The base station utilizes the downlink precoding matrix sequence number of Sounding calculated signals user data, to improve the descending performance of system.

Embodiment one

For having N _FFTIn an OFDM frequency domain symbol of individual subcarrier, operable subcarrier number is N _Used, reject the direct current subcarrier, reference signal sequence can with sub-carrier number be N _Sc=N _Used-1, choose specific reference signal sequence length N _Seq, make:

N _Sc=N _Dec* N _Seq+ N ₀, N _Seq=N ₁+ N ₂=(R+1) N ₂, N wherein _Dec, N ₁, N ₂, R=N ₁/ N ₂Be natural number, 0≤N ₀＜N _DecIt is integer.

Generate two sub-arrangement sets $G_{}$ ${}_1=\{{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{1,0}},...{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>}}_{1,{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1}...,{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>}}_{1,M_1-1}\},$

For length is N ₁Sequence, m ₁=0,1 ..., M ₁-1, the subsequence set ${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">G</figure-callout>}}_2=\{{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="g"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">g</figure-callout>\; </figure-callout>}}_{\mathrm{2,0}},...,{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2,\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">m</figure-callout>}2},...,{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2,M_2-1}\},$

For length is N ₂Sequence, m ₂=0,1 ..., M ₂-1.Subsequence in these two sub-arrangement sets has the character of low peak average ratio.

Utilize two new reference signal sequences that sub-arrangement set generates that generate

As shown in (1.1):

L=R+1 wherein, m=0,1 ..., N _Seq-1, m ₀Integer, and 0≤m ₀≤ R, subscript g (m ₁, m ₂) be m ₁, m ₂Function, mod (x, y)=xmod y is modular arithmetic.According to this formula, in i (R+1) in this reference signal sequence～i (R+1)+R bit, have R bit to be the iR of this first subsequence～iR+R-1 bit, all the other 1 bits are i the bit of this second subsequence, and the relative position of this 1 bit and this R bit is fixed, as being the 1st bit or last 1 bit or certain the middle bit in each group, wherein, i=0,1,, N ₂-1.As shown in Figure 2, show R=2, m ₀, generated the schematic diagram of new reference signal sequence S by subsequence A and B at=2 o'clock.

In the present embodiment, g (m ₁, m ₂) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or residential quarter, uses y=x _b(m ': 1) expression press m ' that the order of big-endian intercepts binary number x to the 1st, has:

m ₁＝Cell_ID _b(m′:1)，m ₂＝Cell_ID _b(m″:m′+1)，(1.2)

Wherein, m ', m " being natural number, m '＜m ", M ₁=2 ^m', M ₂=2 ^{M " m '}Because the sequence number that adopts base station, sector or residential quarter is determined from the selected subsequence of subsequence set, the interference that can avoid neighbor cell to adopt identical reference signal sequence to produce.

Dispensing device is mapped to for subcarrier corresponding to the symbol of transmission of reference signals by the mode shown in (1.3) with reference to burst:

Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on subcarrier,

Be

Function;

Expression is not more than the maximum integer of x; k ₀Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, by N ₀, transmitting antenna the factors such as sequence number of sequence number, residential quarter (or sector, base station, segmentation) sequence number, subframe sequence number, frame number, OFDM symbol among one or more decision.

According to following formula, can be evenly distributed on N except the direct current subcarrier with reference to burst _Sc-N ₀On individual available subcarrier, the signal that the direct current subcarrier sends is 0.

Frequency domain reference signal S needs to transform to the time domain OFDM symbol before transmission, as adopting:

$s\left(t\right)=\mathrm{Re}\{{\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">e</figure-callout>}}^j\underset{\begin{array}{c}k=0\\ k\&NotEqual;\frac{N_{\mathrm{used}}-1}{2}\end{array}}{\overset{k=N_{\mathrm{used}}-1}{\mathrm{\&Sigma;}}}S\left(k\right)\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">e</figure-callout>}}^j\}---\left(1.4\right)$

In formula, f _cBe the center carrier frequencies of system, Δ f is the sub-carrier frequencies interval, T _gThe prefix length of OFDM symbol, 0≤t≤T _S, T _SThe length of OFDM symbol, referring to Fig. 1; K element of S (k) expression sequence, k=0,1 ..., N _Used-1.The present invention also can adopt other existing modes that frequency domain reference signal sequence S is transformed to the time domain OFDM symbol, no longer explanation in aftermentioned embodiment.

Above-mentioned dispensing device can have the system equipment of control function or the dispensing device of the terminal equipments such as mobile phone, palmtop PC for base station or relay station etc.

The G of the present embodiment ₁, G ₂In subsequence be Golay complementary series (also referred to as the Golay sequence), certainly be not limited to this sequence, also can make other sequences that has arbitrarily the low-power peak-to-average force ratio, wherein the definition of Golay sequence and generation method are as follows:

The non-periodic autocorrelation function of defined nucleotide sequence a is:

${\mathrm{\&rho;}}_a\left(k\right)=\underset{i=0}{\overset{N-k-1}{\mathrm{\&Sigma;}}}a\left(i\right)a(i+k),0\&le;k\&le;N-1---\left(1.5\right)$

Wherein N is the length of sequence.If sequence satisfies following condition to (a, b), be called the Golay complementary series:

ρ _a(k)+ρ _b(k)＝0，k≠0(1.6)

In the present embodiment, N ₁And N ₂Value follow following agreement:

${\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">N</figure-callout>}}_1=2^{{\mathrm{\&alpha;}}_1}{10}^{{\mathrm{\&beta;}}_1}{26}^{{\mathrm{\&gamma;}}_1},$ ${\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">N</figure-callout>}}_2=2^{{\mathrm{\&alpha;}}_2}{10}^{{\mathrm{\&beta;}}_2}{26}^{{\mathrm{\&gamma;}}_2}---\left(1.7\right)$

Be natural number, α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂〉=0.Especially, work as β ₁=γ ₁=β ₂=γ ₂=0 o'clock, have $R={\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">N</figure-callout>}}_1/{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">N</figure-callout>}}_2=2^{{\mathrm{\&alpha;}}_1-{\mathrm{\&alpha;}}_2},$ α ₁≥α ₂。Utilize formula (1.7) and N _Seq(N _Seq=N ₁+ N ₂) can calculate corresponding N ₁And N ₂

G ₁In sequence be that length is N ₁The Golay sequence, G ₂In sequence be that length is N ₂The Golay sequence, N ₁, N ₂Satisfy formula (1.7), utilize formula (1.1) generating reference signal sequence.

Below each embodiment be based on the concrete utilization of embodiment one.

Embodiment two

The subcarrier number of supposing a MIMO-OFDM wireless communication system is N _FFT=512, configuration N _t=2 transmitting antennas, residential quarter, sector or base station be numbered Cell_ID, reject the direct current subcarrier, reference signal is at N _ScPress N on individual subcarrier _Dec=3 uniformly-spaced place, i.e. every N _DecHave 1 subcarrier be used for to place reference signal in individual subcarrier, reference signal can with sub-carrier number be 432, corresponding N ₁=128, N ₂=16.

Corresponding reference signal sequence is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Represent a subsequence, x is the lateral coordinates of table 1, and y is the along slope coordinate of table 1, such as ∏ _0,1=9AC0." others " expression " when m is worth for other ", " others " in other formulas herewith.

Suppose Cell_ID=(110011101) _b=413, Cell_ID is arranged _b(8:5)=(1001) _b=9, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1 has:

Table 1

Reference signal sequence is mapped on subcarrier by following rule:

k ₀For satisfying the value of following condition: k ₀=n _t-1 (1.11)

Wherein, N _tBe the number of transmit antennas that the dispensing device that sends reference signal configures, n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

Fig. 3 is k ₀=1, N _Dec=3, N _Used=433, N _FFTThe schematic diagram of the reference signal subcarrier mapping pattern of=512 o'clock certain antennas.N wherein _FFTCounting of the discrete Fourier transform of frequency domain when transforming to time domain, that is the subcarrier number of frequency domain symbol.

Embodiment three

If the subcarrier number that MIMO-OFDM wireless communication system can be supported is N _FFT=512,1024,2,048 three kinds, each N _FFTCorresponding different system bandwidth, residential quarter, sector or base station be numbered Cell_ID, the reference signal on every antenna is pressed N except the direct current carrier wave _Dec=9 uniformly-spaced place, reference signal can with sub-carrier number be 432 * [1+log ₂(N _FFT/ 512)], corresponding N ₁=N _FFT/ 16, N ₂=N _FFT/ 32.

Reference signal sequence corresponding under the different system bandwidth is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Be a subsequence, x is the lateral coordinates of table 2, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, Cell_ID _b(8:5)=(1001) _b=9, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1, M ₁=M ₂=16, have:

Table 2 ∏ _{X, y}Hexadecimal representation (left side is low level)

Reference signal sequence is mapped on subcarrier by following rule:

k ₀For satisfying the value of following two conditions:

Wherein, k ₀=0,1 ..., 8, n _t=1,2 ..., N _tBe the transmitting antenna sequence number, n is frame number, and BRO (x, 3) is the inverted order of 3 bit x.

First becomes example, and the subsequence set G1 of this change row has 16 subsequences, and 32 subsequences are arranged in G2, and other parameters are all identical with embodiment three, becomes in example M at this ₁=16, m '=4, M ₂=32, m "=9, correspondingly, reference signal sequence corresponding under the different system bandwidth is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Be a subsequence, x is the lateral coordinates of table 2, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, Cell_ID _b(9:5)=(1001) _b=25, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1 has:

The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).

Second becomes example, and the subsequence set G1 of this changes example has 32 subsequences, and 16 subsequences are arranged in G2, other parameters all with the embodiment three-phase while, in this change example, due to M ₁=32, m '=5, M ₂=16, m "=9.Correspondingly, under the different system bandwidth, corresponding reference signal sequence is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Be a subsequence, needing table 2 lateral coordinates be that subsequence number in the subsequence set of 2 row correspondence is increased to 32, and x is the lateral coordinates of this table, and y is along slope coordinate, such as H _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, Cell_ID _b(9:6)=(1100) _b=12, Cell_ID _b(5:1)=(11101) _b=29, log ₂(N _FFT/ 512)=1 has:

The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).

The 3rd becomes example, the M of this change example ₀Value be mod (Cell_ID, 3), other parameters are all identical with embodiment three, correspondingly, reference signal sequence corresponding under the different system bandwidth is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Represent a sequence, x is the lateral coordinates of table 2, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, Cell_ID _b(8:5)=(1001) _b=9, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1, mod (Cell_ID, 3)=2 has:

The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).

Embodiment four

The subcarrier number that MIMO-OFDM wireless communication system can be supported is N _FFT=512,1024,2,048 three kinds, each N _FFTCorresponding different system bandwidths can be configured to N _t=2,4,8 antennas, residential quarter, sector or base station be numbered Cell_ID, reject the direct current subcarrier, reference signal is at N _ScPress N on individual subcarrier _Dec=3 * N _tUniformly-spaced place, reference signal can with sub-carrier number be 432 * [1+log ₂(N _FFT/ 512)], corresponding N ₁=N _FFT/ (4 * N _t), N ₂=N _FFT/ (32 * N _t).

Reference signal sequence corresponding under the different system bandwidth is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Be a subsequence, x is the lateral coordinates of table 3, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, N _t=2, Cell_ID _b(8:5)=(1001) _b=9, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1, M ₁=M ₂=16, have:

Table 3 ∏ _{X, y}Hexadecimal representation (left side is low level)

Continued 3

∏ x，y	5
		0	0505363639390A0AFA05C936C639F50A50AF639C6C935FA0AFAF9C9C9393A0A0
1	555A00F05A550FFF666933C39699C333666933C369663CCC555A00F0A5AAF000
		2	114B1E44EEB4E1BB114BE 1BBEEB41E4422782D7722782D772278D2882278D288
3	05363605F5C6C6F50536C9FAF5C6390A509C63AFA06C935F509C9C50A06C6CA0
		4	1122447711DD44881E2D4B78E12DB478E1D2B487E12DB478EEDDBB8811DD4488
5	1111EE1122DDDDDD4B4BB44B788787871E1EE11E2DD2D2D24444BB4477888888
		6	111111EE22DD22224B4B4BB478877878E1E1E11ED22DD2D2BBBBBB4488778888
7	00CC559933FF66AA0FC35A96C30F965A0FC3A5693CF0965A00CCAA66CC0066AA
		8	121212EDED12EDED4747B847B84747471D1D1DE2E21DE2E24848B748B7484848
9	050AC9C63639FAF505F5C939C93905F5505F9C93636CAFA050A09C6C9C6C50A0
		10	000F555A5A550F0033C3669669993CCC000FAAA55A55F0FF33C399696999C333
11	050A36393639050A05F5C93936C6FA0AAFA09C939C93AFA0AF5F63939C6C50A0
		12	1212E2E24747B7B712EDE21D47B8B74812EDE21DB84748B71212E2E2B8B84848
13	00335A690F3C55663300695A3C0F665500CC5A96F03CAA6633FF69A5C30F9955
		14	00550F5A5A0F55003366C396693C99CC00AA0FA55AF055FF3399C36969C39933
15	14271B28EBD8E4D714D81BD7EB27E4281427E4D71427E4D714D8E42814D8E428

16	00330F3C3C0F330055995A9669A566AA0033F0C33C0FCCFF5599A56969A59955
		17	141414EB14EB14141B1B1BE4E41BE4E4D8D8D827D827D8D8D7D7D72828D72828
18	00330F3C0FC300CC6655695A69A566AA0033F0C30FC3FF33665596A569A59955
		19	00F066960FFF699955A533C35AAA3CCC33C355A5C333A555669600F09666F000
20	000F33C3333C00F0AAA599699996AA5A5A55699969665AAAF0FFC333C3CCF000
		21	00330F3C0FC300CC5566A5965A96AA66AA99A596A569AA66FFCC0F3CF03C00CC
22	124712471D481D48EDB81247E2B71D4812B8ED471DB7E248ED47ED47E248E248
		23	00333C0F0F3C33005566695AA59699AA00CC3CF00FC333FF559969A5A5699955
24	141414EB1B1B1BE414EB14141BE41B1B141414EBE4E4E41BEB14EBEB1BE41B1B
		25	00F033C30FFFC333669655A56999A55555A566965AAA966633C300F03CCCF000
26	0536AF9C36059CAF0536AF9CC9FA63500A39A093390A93A0F5C65F6C390A93A0
		27	0536360550636350FA36C905AF639C500536C9FAAF9C6350FA3636FA509C9C50
28	000F3C33333C0F00555A696666695A55000F3C33CCC3F0FFAAA5969966695A55
		29	005566330F5A693C00AA66CC0FA569C300556633F0A596C3FF5599330FA569C3
30	00553399336600AA5A0F69C3693C5AF000553399CC99FF555A0F69C396C3A50F
		31	00550F5A0F5A00556633693C693C663300AAF05A0FA5FF5566CC963C69C39933

Reference signal sequence is mapped on subcarrier by following rule:

Wherein: k ₀For satisfying the value of following condition:

k ₀＝n _t-1+mod(Cell_ID，3)×N _Dec (1.26)

n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

First becomes example, and the subsequence set G1 of this change example has 16 subsequences, and 32 subsequences are arranged in G2, and other parameters are all identical with embodiment four.Become in example, due to M at this ₁=16, m '=4, M ₂=32, so m "=9.Correspondingly, under the different system bandwidth, corresponding reference signal sequence is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Represent a sequence, x is the lateral coordinates of table 3, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, N _t=2, Cell_ID _b(9:5)=(11001) _b=25, Cell_ID _b(4:1)=(1101) _b=13, log ₂(N _FFT/ 512)=1 has:

The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).

Second becomes example, and the subsequence set G1 of this change example has 32 subsequences, and 16 subsequences are arranged in G2, and other parameters are all identical with embodiment four.Become in example, due to M at this ₁=32, m '=5, M ₂=16, so m "=9.Correspondingly, under the different system bandwidth, corresponding reference signal sequence is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Represent a sequence, x is the lateral coordinates of table 3, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=413, N _FFT=1024, N _t=2 Cell_ID _b(9:6)=(1100) _b=12, Cell_ID _b(5:1)=(11101) _b=29, log ₂(N _FFT/ 512)=1 has:

The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).

The 3rd becomes example, the M of this change example ₀Value be 4*mod (Cell_ID, 3), other parameters are all identical with embodiment four, correspondingly, reference signal sequence corresponding under the different system bandwidth is obtained by following formula:

Cell_ID wherein _bBinary representation, ∏ _{X, y}Be a subsequence, x is the lateral coordinates of table 3, and y is along slope coordinate, such as ∏ _0,1=9AC0.Cell_ID=(110011101) for example _b=412, N _FFT=1024, N _t=2, Cell_ID _b(8:5)=(1001) _b=9, Cell_ID _b(4:1)=(1100) _b=12, log ₂(N _FFT/ 512)=Isosorbide-5-Nitrae * mod (Cell_ID, 3)=4 has:

The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).

The below illustrates the PAPR of the reference signal sequence of such scheme generation theoretically.

PAPR is defined as:

$\mathrm{PAPR}=\frac{\max {\left|\right|x_n\left|\right|}^2}{{\left|\right|x\left|\right|}^2/N}---\left(2.1\right)$

X=[x wherein ₀, x ₁, x ₂..., x _N-1] ^TThe signal on time domain, and

$x_n=\frac{1}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{c}_{\mathrm{<figure-callout\; id="2"\; label="k\; e\; j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}{e}^j{\frac{2\mathrm{\&pi;kn}}{N}}^{},n=\mathrm{1,2},...,N-1---\left(2.2\right)$

Wherein, c _kBe the data on subcarrier k.In real system, digital signal finally transfers analog signal to, and the oversampling that generally carries out four times gets final product.Adopt 8 times of oversamplings when supposing emulation.That is:

$X_{\mathrm{oversample}}=\left\{\begin{array}{c}X\left(k\right),k\&Element;\{-(N_{\mathrm{used}}-1)/2,...,\mathrm{0,1},...,(N_{\mathrm{used}}-1)/2\}\\ 0,\mathrm{others}\end{array}\right.---\left(2.3\right)$

Corresponding inverse discrete Fourier transform (IDFT) is:

$x\left(n\right)=\frac{1}{\sqrt{\mathrm{LN}}}\underset{k=-\mathrm{LN}/2}{\overset{\mathrm{LN}/2-1}{\mathrm{\&Sigma;}}}{X}_{\mathrm{oversample}}\left(k\right){\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">e</figure-callout>}}^j---\left(2.4\right)$

L=8 wherein.

The non-periodic autocorrelation function of defined nucleotide sequence a (Aperiodic Auto-Correlation Function, AACF) is:

${\mathrm{\&rho;}}_a\left(k\right)=\underset{i=0}{\overset{N-k-1}{\mathrm{\&Sigma;}}}{a}_i{a}_{i+k},0\&le;k\&le;N-1---\left(2.5\right)$

Or

${\mathrm{\&rho;}}_a\left(k\right)=\underset{i=k}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_i{a}_{i-k},0\&le;k\&le;N-1---\left(2.6\right)$

Wherein N is the length of sequence.If sequence satisfies following condition to (a, b), be called Golay complementary series (or Golay sequence):

ρ _a(k)+ρ _b(k)＝0，k≠0(2.7)

If the related polynomial of (a, b) is a (z), b (z), namely

$a\left(z\right)=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_i{z}^i---\left(2.8\right)$

Have

a(z)a(z ^-1)+b(z)b(z ^-1)＝2N (2.9)

Formula (2.7) and (2.9) equivalence, because:

$a\left(z\right)a\left(z^{-1}\right)=\underset{p=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_p{z}^p\underset{q=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_q{z}^{-q}$

$={\mathrm{\&rho;}}_a\left(0\right)+\underset{p=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\underset{q=0,p\&NotEqual;q}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_p{a}_q{z}^{p-q}$

$={\mathrm{\&rho;}}_a\left(0\right)+\underset{p=0}{\overset{N-2}{\mathrm{\&Sigma;}}}\underset{q=p+1}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_q{a}_p{z}^{p-q}+\underset{p=1}{\overset{N-1}{\mathrm{\&Sigma;}}}\underset{q=0}{\overset{p-1}{\mathrm{\&Sigma;}}}{a}_q{a}_p{z}^{p-q}$

$={\mathrm{\&rho;}}_a\left(0\right)+\underset{p=0}{\overset{N-2}{\mathrm{\&Sigma;}}}\underset{k=1}{\overset{N-1-p}{\mathrm{\&Sigma;}}}{a}_{p+k}{a}_p{z}^{-k}+\underset{p=1}{\overset{N-1}{\mathrm{\&Sigma;}}}\underset{k=1}{\overset{p}{\mathrm{\&Sigma;}}}{a}_p{a}_{p-k}{z}^k---\left(2.10\right)$

$={\mathrm{\&rho;}}_a\left(0\right)+\underset{k=1}{\overset{N-1}{\mathrm{\&Sigma;}}}{z}^{-k}\underset{p=0}{\overset{N-k-1}{\mathrm{\&Sigma;}}}{a}_{p+k}{a}_p+\underset{k=2}{\overset{N-1}{\mathrm{\&Sigma;}}}{z}^k\underset{p=k}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_p{a}_{p-k}$

$={\mathrm{\&rho;}}_a\left(0\right)+\underset{k=1}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{\&rho;}}_a\left(k\right)(z^k+z^{-k})$

If order $z=e^{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;<figure-callout\; id="1"\; label="n\; N"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">n</figure-callout>}}{N_{}}},$ And N=N ₁,

The IDFT of expression sequence a, so time-domain signal a _tPAPR be:

See again the situation when the golay sequence is uniformly-spaced placed,

By formula (2.11), its PAPR is:

$=\frac{\frac{1}{N_{\mathrm{fft}}^2}a\left(z\right)a\left(z^{-1}\right){|}_{z=e^{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}{n}_1}{N_{\mathrm{fft}}}}=e^{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;d}*n}{d*N}}=e^{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;n}}{N}}}}{\frac{N}{N_{\mathrm{fft}}^2}}\&le;\frac{2N/N_{\mathrm{fft}}^2}{N/{\mathrm{<figure-callout\; id="2"\; label="N\; fft"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">N</figure-callout>}}_{\mathrm{fft}}^{}}\&le;2---\left(2.14\right)$

Be provided with Golay sequence a, the following formation of sequence a ':

m ₀=0,2 ^p-q, 2 ^P-q-1Have:

PAPR(a′)≤2(2.16)

Prove as follows:

Formula (2.8) is slightly made an amendment:

$a^{\&prime;}\left(z\right)=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{a}_i{z}^{f_{a^{\&prime;}}\left(i\right)}---\left(2.18\right)$

And

f ₀(i-j)＝f _a′(i-j)-k ₀＝f _a′(i)-f _a′(j)(2.19)

Make k ₀=m ", following formula satisfies formula (2.19):

Formula (2.18) substitution (2.10) has:

$a^{\&prime;}\left(z\right)a^{\&prime;}\left(z^{-1}\right)={\mathrm{\&rho;}}_a\left(0\right)+\underset{k=1}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{\&rho;}}_a\left(k\right)(z^{f_0\left(k\right)}+z^{f_0(-k)})---\left(2.21\right)$

Thereby for a ' (z), formula (2.9) is set up.

Fig. 4 is L=3, m ₀The CDF of the PAPR of=0,1,2: 3096 Golay sequence.

If two Golay sequence [a ₁, a ₂] form a new sequence a, suppose that the maximum of its time domain is respectively m ₁, m ₂And drop on the same quadrant of complex plane, because DFT is linear transformation, have:

$\mathrm{PAPR}\left(a\right)\&le;\frac{{({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1+m_2)}^{*}({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1+m_2)}{{\stackrel{\&OverBar;}{P}}_1+{\stackrel{\&OverBar;}{P}}_2}=\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1\right|}^2+{\left|{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">m</figure-callout>}}_2\right|}^2+2\&times;\mathrm{real}\left({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1^{*}{m}_2\right)}{{\stackrel{\&OverBar;}{P}}_1+{\stackrel{\&OverBar;}{P}}_2}$ (1.8)

$\&le;2\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H2009101760379E00012.png"\; state="\{\{state\}\}">m</figure-callout>}}_1\right|}^2+{\left|{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H2009101760379E00012.png,H2009101760379E00021.png"\; state="\{\{state\}\}">m</figure-callout>}}_2\right|}^2}{{\stackrel{\&OverBar;}{P}}_1+{\stackrel{\&OverBar;}{P}}_2}=4$

Fig. 5 is the forward and backward PAPR contrast of mapping, can find out that the forward and backward PAPR of mapping changes very little.

Can be found out by above explanation, embodiments of the invention when having limiting factor as expansion or brachymemma, can keep the character of low peak average ratio with the reference signal sequence of the subsequence formation of two low peak average ratios.

Such scheme also can use at wireless communication system of multicarrier code division multiplexing (MC-CDMA:Multi-Carrier CodeDivision Multiple Access) and/or MIMO technology etc.

Claims (8)

1. the generation method of a wireless channel measurement reference signal, be used for the multi-frequency waves communication system, and this generation method comprises:

According to the reference signal sequence length N _SeqSelect one first subsequence and one second subsequence, and N is arranged _Seq=N ₁+ N ₂, N ₁Be the length of the first subsequence, N ₂Be the length of the second subsequence, R=N ₁/ N ₂, N _seq, N ₁, N ₂, R is natural number, described length represents with bit number;

According to described the first subsequence and the second subsequence generating reference signal sequence, there be R bit to be the iR of this first subsequence～iR+R-1 bit in this reference signal sequence i (R+1)～i (R+1)+R bit, all the other 1 bits are i the bit of this second subsequence, i=0,1, ..., N ₂-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed;

Described N _SeqDetermine according to following formula: N _Sc=N _Dec* N _Seq+ N ₀, wherein, N _ScBe the subcarrier number that reference signal sequence can be used, N _DecBe natural number, N ₀Integer, 0≤N ₀＜N _Dec

And, N ₁And N ₂Value follow following agreement:

Wherein, α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂〉=0, α ₁〉=α ₂

Formula during according to described the first subsequence and the second subsequence generating reference signal sequence is as follows:

Wherein,

Be the reference signal sequence that will generate, Be the first subsequence, from the first subsequence set

Select, Be the second subsequence, from the second subsequence set

Select m ₁=0,1 ..., M ₁-1, m ₂=0,1 ..., M ₂-1, M ₁, M ₂Be respectively G ₁, G ₂In the subsequence number that comprises, L=R+1, m=0,1 ..., N _Seq-1, m ₀Integer, and 0≤m ₀≤ R, subscript g (m ₁, m ₂) be m ₁, m ₂Function, mod (x, y)=xmody, the expression modular arithmetic;

Described g (m ₁, m ₂) equaling Cell_ID, Cell_ID is that the sequence number of base station, sector or residential quarter has:

m ₁＝Cell_ID _b(m′：1)，m ₂＝Cell_ID _b(m″：m′+1)

Wherein, Cell_ID _bThe binary representation of Cell_ID, Cell_ID _b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM ' to the 1st, Cell_ID _b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM " to m '+1, m ', m " being natural number, m '＜m ", M ₁=2 ^m′, M ₂=2 ^{M " m '}

2. generation method as claimed in claim 1, is characterized in that m ₀=0, R or R/2.

3. generation method as claimed in claim 1, is characterized in that, described the first subsequence and the second subsequence are the Golay complementary series.

4. generation method as claimed in claim 1, is characterized in that, described reference signal is intermediate pilot or Sounding signal.

5. generation method as claimed in claim 1 is characterized in that:

The subcarrier number N that described communication system is supported _FFT512 multiple, the sub-carrier number N that reference signal can be used _Sc=432 * [1+log ₂(N _FFT/ 512)];

N _DecThe placement interval of expression reference signal when frequency domain is uniformly-spaced placed represents N with sub-carrier number _DecBe a fixed value or the N between 0～9 _Dec=3 * N _t, N _tNumber of transmit antennas for the dispensing device configuration that sends reference signal;

At definite N ₁, N ₂The time, make β ₁, γ ₁, β ₂, γ ₂Be 0, M ₁=8,16 or 32, M ₂=8,16 or 32.

6. the generation of a wireless channel measurement reference signal and sending method, be used for multi-carrier communications systems, and this sending method comprises:

According to claim 1, in～5 the described generation method of arbitrary claim generates the reference signal sequence that will send;

Dispensing device equally spaced is mapped on frequency domain on all available subcarriers except the direct current subcarrier with reference to burst or to the sequence that obtains after this reference signal sequence conversion, obtain the frequency domain reference signal, send after this frequency domain reference signal is transformed to time-domain symbol;

Described dispensing device is mapped to for subcarrier corresponding to the symbol of transmission of reference signals with reference to burst by following formula:

Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on subcarrier,

Be

Function;

Expression is not more than the maximum integer of x, k ₀Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N _UsedIt is the available sub-carrier number that comprises the direct current subcarrier;

Wherein, Cell_ID is the sequence number of base station, sector or residential quarter, k ₀A kind of in the following manner comes value:

The first, k ₀=n _t-1;

The second, k ₀For satisfying the value of following two conditions:

Wherein, k ₀=0,1 ..., 8, n is frame number, BRO (x, 3) is the inverted order of 3 bit x;

The third, k ₀For satisfying the value of following condition:

k ₀＝n _t-1+mod(Cell_ID，3)×N _Dec

Above various in, N _tBe the number of transmit antennas of described dispensing device configuration, n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

7. the generation of a wireless channel measurement reference signal and dispensing device, comprise that subsequence provides module, is used for providing the first subsequence set With the second subsequence set G ₁In comprise M ₁Individual length is N ₁The first subsequence, G ₂In comprise M ₂Individual length is N ₂The second subsequence, m ₁=0,1 ..., M ₁-1, m ₂=0,1 ..., M ₂-1, N _SeqBe the length of reference signal sequence, R=N ₁/ N ₂, N _seq, N ₁, N ₂, R is natural number, length represents with bit number;

Subsequence is selected module, is used for selecting one first subsequence from the first subsequence set

Select one second subsequence from the second subsequence set

The sequence generation module is used for basis

With

The generating reference signal sequence has R bit to be in this reference signal sequence i (R+1)～i (R+1)+R bit

An iR～iR+R-1 bit, all the other 1 bits are

I bit, i=0,1 ..., N ₂-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed;

The sequence sending module, be used for the reference signal sequence that will generate or the sequence that obtains after this reference signal sequence conversion equally spaced is mapped to all available subcarriers except the direct current subcarrier on frequency domain, obtain the frequency domain reference signal, then send after transforming to time-domain symbol;

Described subsequence provides the first subsequence that module provides and the length N of the second subsequence ₁, N ₂Value follow following agreement:

Wherein, α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂〉=0, α ₁〉=α ₂, and N is arranged _Sc=N _Dec* N _Seq+ N ₀, N _ScBe the subcarrier number that reference signal sequence can be used, N _DecBe natural number, the expression placement interval of reference signal when frequency domain is uniformly-spaced placed, N ₀Integer, 0≤N ₀＜N _Dec

Described sequence generation module basis

With

The generating reference signal sequence

The time formula as follows:

Wherein, L=R+1, m=0,1 ..., N _Seq-1, m ₀Integer, and m ₀=0, R or R/2, subscript g (m ₁, m ₂) be m ₁, m ₂Function, mod (x, y)=xmody, the expression modular arithmetic;

Described subsequence selects module to select from the first subsequence set and the second subsequence set according to following formula

With

m ₁＝Cell_ID _b(m′：1)，m ₂＝Cell_ID _b(m″：m′+1)

Wherein, Cell_ID _bThe binary representation of Cell_ID, described g (m ₁, m ₂) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or residential quarter, Cell_ID _b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM ' to the 1st, Cell_ID _b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression _bM " to m '+1, m ', m " being natural number, m '＜m ", M ₁=2 ^m′, M ₂=2 ^{M " m '}

Described sequence sending module is mapped to for subcarrier corresponding to the symbol of transmission of reference signals with reference to burst by following formula:

Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on subcarrier,

Expression is not more than the maximum integer of x, k ₀Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N _UsedBe the available sub-carrier number that comprises the direct current subcarrier, Cell_ID is the sequence number of base station, sector or residential quarter, k ₀A kind of in the following manner comes value:

The first, k ₀=n _t-1;

The second, k ₀For satisfying the value of following two conditions:

Wherein, k ₀=0,1 ..., 8, n is frame number, BRO (x, 3) is the inverted order of 3 bit x;

The third, k ₀For satisfying the value of following condition:

k ₀＝n _t-1+mod(Cell_ID，3)×N _Dec

Above various in, N _tBe the number of transmit antennas of described dispensing device configuration, n _t=1,2 ..., N _tBe the transmitting antenna sequence number.

8. generation as claimed in claim 7 and dispensing device is characterized in that:

It is the Golay complementary series that described subsequence provides the first subsequence and the second subsequence that module provides; Described sequence sending module sends described reference signal sequence as intermediate pilot or Sounding signal.

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