CN101515809B - Method and device for reducing reference signal CM in carrier wave polymerization scene - Google Patents

Abstract

The invention discloses a method and device for reducing reference signal CM in carrier wave polymerization scene. The method includes steps of generating long sequence according to LTE-A system carrier wave configure and cell specific descending reference signal sequence in LTE Release 8, grouping the generated long sequence, and distributing the long sequence according to cell carrier wave property to reduce base station terminal CM. The technical solution provided by the present invention can reduce CM of transmitting terminal at the premise of not changing the LTE standard basically, thereby reducing power consumption of device.

Description

In carrier aggregation scene, reduce the method and apparatus of reference signal CM

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of senior Long Term Evolution (Long TermEvolution Advanced, LTE-A) in system, in carrier aggregation scene, reduce the method and apparatus of reference signal cubic measure (Cubic Metric, CM).

Background technology

In radio communication, the nonlinear distortion of high power amplifier (HPA) and peak amplitude restriction can cause imbalance (Inter-modulation) effect between carrier wave and in system, introduce extra interference.In order to prevent and treat this negative effect, just should make power amplifier be operated in its range of linearity.Conventionally, wireless communication terminal, in order to save device cost, can not configure a power amplifier that has the very large range of linearity.In this case, if the larger signal of amplitude is carried out to peak clipping (Clipping), will produce the interference to inband signaling and neighboring trace signal.If improve the linear characteristic of power amplifier by " rollback ", can reduce the power efficiency of power amplifier.

Papr (peak to-average power ratio, PAPR) is the measurement method of relatively commonly using traditionally, the ratio between the amplitude peak of main transmitted signal and mean value.Tradition multi-transceiver technology, as OFDM (Orthogonal Furequency Division Multiplexity, OFDM), its signal is formed by stacking by the signal with different carrier frequency of a large amount of separate modulation, has very large PAPR.Under extreme case, if N the signal stack with same phase, the amplitude of the peak value producing is N times of average signal amplitude.Therefore, the transmission technology with high PAPR can reduce the power efficiency of radio-frequency (RF) power amplification, and requires transmitter power amplifier to have a very large range of linearity, thereby greatly improves the complexity of D/A and A/D converter, increases the cost of terminal.More adopt traditionally the PAPR under 99.9% probability indirectly to weigh transmission technology to the nonlinear impact of power amplifier.

But in fact, CM is than PAPR measure more accurately.CM directly characterizes the reduction of power amplifier power efficiency, or is called power degeneration (Power De-Rating).In amplifier circuit, the cube nonlinear component of gain amplifier is the main cause that produces channel ACLR (ACLR).As shown in the formula:

v ₀(t)＝G ₁v _I(t)+G ₃[v _I(t)] ³

Power amplifier output signal v ₀(t) by two, form: one and v _i(t) be directly proportional, namely linear component; One and v _i(t) cube be directly proportional, namely nonlinear component.This cube of item is to cause channel distortion, triple-frequency harmonics, thereby causes the reason of the interior interference of band and monkey chatter.Therefore with CM value directly this cube of item of measurement be than PAPR more directly, balancing method accurately.

Due to the structure of weighing with PAPR and CM and be not exclusively directly proportional, some technology has obvious effect to the reduction of PAPR, but undesirable to the reduction of CM, and LTE finally determines that CM is the accurate way of weighing power amplifier power efficiency.

In 3GPP LTE-A system, when up-downgoing adopts spectrum aggregating technology, if descending all polymerization carrier wave (Component Carrier, CC) all use same cells identification number (Cell ID), the descending carrier of each polymerization will produce identical downlink reference signal (RS) pattern so, in the situation that transmitting terminal is used a power amplifier and radio frequency, the repeatability of downlink reference signal on frequency domain, by cause using spectrum aggregating technology CM value with do not use the CM value of spectrum aggregating technology to compare, there is very large increase, will bring great burden to the power amplifier (Power Amplifier) of base station end like this.

Some companies propose each descending carrier in 3GPP LTE-A system and use different Cell Identity CI (Cell ID).Because each descending carrier is used different districts identification number, the sequence of the downlink reference signal of generation is also thereupon different, and therefore, the problem that CM raises can be too not serious.But this method also can be with the problem of serving, for example, the in the situation that of the asymmetric polymerization of up-downgoing, the sequence that can have influence on PUCCH generates, and the PUCCH that causes a plurality of users to produce is different, and between user, the orthogonality of PUCCH sequence is destroyed.In addition, use different Cell Identity CIs also can serve trouble to plot planning band.

Company of Texas Instrument (TI) proposes, need on different carrier waves, not broadcast different Physical Cell Identifier number (Cell ID), the problem that CM raises simultaneously can be by simple method, and namely different descending carriers are used the method for different phase rotatings to solve.In motion, TI is for a simple example, and emulation has illustrated the benefit of its scheme.Concrete scheme is as follows:

When there are 5 descending carriers ●Dang community: only have the 4th carrier wave to carry out phasing back.

When there are 4 descending carriers ●Dang community: only have the 4th carrier wave to carry out phasing back.

When there are 3 descending carriers ●Dang community: only have the 3rd carrier wave to carry out phasing back.

When there are 2 descending carriers ●Dang community: do not have carrier wave to carry out phasing back.

When there is 1 descending carrier ●Dang community: do not have carrier wave to carry out phasing back.

But the shortcoming of the scheme of TI is phase rotating informational needs informs LTE-Advanced user terminal by base station end, and this information is transparent to LTE Release 8 users.Therefore TI proposes, and the user of LTE Release 8 does not access the descending carrier of phasing back, has so just limited the access of LTE Release 8, and the CM value of the scheme of TI is still higher.

Summary of the invention

The technical problem to be solved in the present invention overcomes while configuring a plurality of carrier wave in LTE-A system small area exactly, because each the polymerization carrier wave under same power amplifier generates identical reference signal sequence according to Cell Identity CI, and then cause the problem of the increase of equipment CM, propose to reduce in carrier aggregation scene the method and apparatus of reference signal CM value, can substantially not change under the prerequisite of LTE standard, reduce the CM of transmitting terminal, thereby reduce the power consumption of equipment.

In order to solve the problems of the technologies described above, the invention provides a kind of method that reduces reference signal cubic measure CM in carrier aggregation scene, be applied to advanced long-term evolution system, comprising:

Base station generates a long sequence according to following formula:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer, N _rB ^{max, DL}for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Base station is divided into K by described long sequence and organizes short sequence, and the reference signal sequence of selecting wherein one group of short sequence to use as the descending carrier of backward compatibility, the reference signal sequence of selecting one or more groups short sequence wherein to use as non-backward compatible carrier waves.

Further, said method also can have following characteristics:

Described K=2, the long sequence that base station generates is:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,{4N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station is divided into 2 groups of short sequences by described long sequence, and selects short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m={2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,{4N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles.

Further, said method also can have following characteristics:

Described K=N _{non_Max}+ 1, N _{non_Max}for the maximum number of the descending carrier of non-backward compatible, the long sequence that base station generates is:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station is divided into N by described long sequence _{non_Max}+ 1 group of short sequence, and select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Base station selected N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility.

Further, said method also can have following characteristics:

Base station is according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{non_Max}the reference signal sequence that+1 group of short sequence is used as the descending carrier of non-backward compatible.

Further, said method also can have following characteristics:

Described base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier;

Terminal, according to the attribute of the descending carrier using, adopts corresponding reference signal sequence to detect;

The attribute of described descending carrier refers to: described descending carrier is backward compatibility or non-backward compatible.

In order to solve the problems of the technologies described above, the present invention also provides the device that reduces reference signal CM in a kind of carrier aggregation scene, is applied to the base station of advanced long-term evolution system, comprising: connected generation module, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),n=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer, N _rB ^{max, DL}for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Described grouping module is organized short sequence for described long sequence is divided into K, sends to selection module;

Described selection module, for selecting described K to organize one group of short sequence of short sequence as the reference signal sequence of the descending carrier use of backward compatibility, selects K to organize the reference signal sequence that one or more groups the short sequence in short sequence is used as non-backward compatible carrier waves.

Further, said apparatus also can have following characteristics:

Described generation module is used for generating following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is for being divided into 2 groups of short sequences by described long sequence;

Described selection module is used for selecting short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles.

Further, said apparatus also can have following characteristics:

Described generation module is used for generating following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

N wherein _{non_Max}maximum number for the descending carrier of non-backward compatible; Described grouping module is for being divided into N by described long sequence _{non_Max}+ 1 group of short sequence;

Described selection module is used for selecting short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Described selection module is used for selecting N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility.

Further, said apparatus also can have following characteristics:

Described selection module is also for according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{non_Max}the reference signal sequence that+1 group of short sequence is used as the descending carrier of non-backward compatible.

In order to solve the problems of the technologies described above, the present invention also provides the device that reduces reference signal CM in a kind of carrier aggregation scene, be applied to base station and the terminal of advanced long-term evolution system, described base station comprises connected successively generation module, grouping module and selection module, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer, N _rB ^{max, DL}for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Described grouping module is organized short sequence for described long sequence is divided into K, sends to selection module;

Described selection module, for selecting described K to organize one group of short sequence of short sequence as the reference signal sequence of the descending carrier use of backward compatibility, selects K to organize the reference signal sequence that one or more groups the short sequence in short sequence is used as non-backward compatible carrier waves;

The corresponding relation of the reference signal sequence that described detection module is appointed for basis and base station and the attribute of descending carrier, and the attribute of the descending carrier using, adopt corresponding reference signal sequence to detect.

The present invention is in carrier aggregation scene, according to the configuration of LTE-A system carrier and LTE Release 8 small area specific downlink reference signal sequence formula, generate long sequence, and the long sequence generating is divided into groups, according to cell carrier attribute, distribute, and then reduce base station end CM.Adopt technical scheme of the present invention, can substantially not change under the prerequisite of LTE standard, reduce the CM of transmitting terminal, thereby reduce the power consumption of equipment.

Accompanying drawing explanation

Fig. 1 is the flow chart of the embodiment of the present invention one;

Fig. 2 is the flow chart of the embodiment of the present invention two;

Fig. 3 is the device block diagram of the embodiment of the present invention.

Embodiment

In the present invention, base station generates formula according to the descending cell specific reference signal sequence of LTE Release 8 and generates a long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer,

for the long sequence generating, N _rB ^{max, DL}for the maximum resource piece number of downlink transfer, n _sbe time slot (Slot) label in a radio frames in LTE frame structure, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence, with the definition in 3GPP TR36.211;

Base station is divided into K by described long sequence and organizes short sequence, and the reference signal sequence of selecting wherein one group of short sequence to use as the descending carrier of backward compatibility, the reference signal sequence of selecting one or more groups short sequence wherein to use as non-backward compatible carrier waves.

Below in conjunction with drawings and the specific embodiments, the present invention is described in detail.

Embodiment mono-(scheme 1)

For example, LTE-A cell downlink configuration carrier wave number is N _total, wherein non-backward compatible carrier waves number is N _non, backward compatibility carrier wave number is N _total-N _non, N wherein _total-N _non> 0.

As shown in Figure 1, the embodiment of the present invention comprises the steps:

Step 101, the sequence generating mode of first take in LTE Release 8 produces long sequence as basis, but different from LTE Release 8, we have changed the m length in formula (1):

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(1\right)$

As shown in formula (2), we make the extended length of m to 4N _rB ^{max, DL}, i.e. K=2.

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(2\right)$

Step 102, after long sequence generates, is divided into two groups the long sequence generating;

Step 103, base station down when transmitting, selects reference signal sequence: the descending carrier of backward compatibility is used first group in the sequence that formula (2) produces, namely the downlink reference signal sequence S the same with formula (1) ₁, so just can guarantee that LTE Release 8 terminals can detect the downlink reference signal on backward compatibility carrier wave; And non-backward compatible carrier waves is used the 2nd group of sequence that formula (2) produces, i.e. sequence S shown in formula (3) ₂.

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(3\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier, respectively sequence information are stored in the reference signal sequence memory of base station end and LTE-A terminal.

Terminal is according to the attribute of the descending carrier using, and descending carrier is backward compatibility or non-backward compatible, adopts corresponding reference signal sequence to detect.For example,, when having used the descending carrier of backward compatibility to use the 1st group in the sequence that formula (2) produces, namely the downlink reference signal sequence S the same with formula (1) ₁detect; When using non-backward compatible carrier waves, use sequence that formula (2) produces the 2nd group, i.e. sequence S shown in formula (3) ₂carry out the detection of reference signal.

Embodiment bis-(scheme 2)

For example,, as certain LTE-A cell downlink configuration N _totalduring individual carrier wave, N wherein _nonfor the non-backward compatible carrier waves number of this LTE-A cell downlink configuration, N _{non_Max}for the maximum number of non-backward compatible carrier waves in LTE-A system, and N _{non_Max}>=N _non, so the backward compatibility carrier number of this LTE-A cell configuration is N _total-N _non, and N _total-N _non> 0.

As shown in Figure 2, the embodiment of the present invention comprises the steps:

Step 201, the sequence generating mode of first take in LTE Release 8 produces long sequence as basis, but different from LTE Release 8, we have changed the m length in formula (1):

As shown in formula (4), we make extended length to the 2 (N of m _{non_Max}+ 1) N _rB ^{max, DL}, i.e. K=N _{non_Max}+ 1:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(4\right)$

Step 202, after long sequence generates, is divided into N in order long sequence _{non_Max}+ 1 group;

Step 203, in LTE-A community, during base station down transmitting, select reference signal sequence: the carrier wave of backward compatibility is used first group in the sequence that formula (4) produces, namely the downlink reference signal sequence the same with formula (1), so just can guarantee that LTE Release 8 terminals can detect the downlink reference signal on backward compatibility carrier wave; And N _{non_Max}individual non-backward compatible carrier waves is according to carrier frequency point height, the sequence that the formula that uses in order (4) produces below the 2nd to N _non+ 1 part of sequence, i.e. sequence shown in formula (5) (6) (7).

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(5\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$S_3=r_{l,n_3}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(6\right)$

$m=4N_{\mathrm{RB}}^{\max ,\mathrm{DL}},4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,6N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$S_{N_{\mathrm{Non}}+1}{r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(7\right)$

$m=2N_{\mathrm{Non}}{N}_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{Non}}{N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,2(N_{\mathrm{Non}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier, respectively sequence information are stored in the reference signal sequence memory of base station end and LTE-A terminal.

Terminal is according to the attribute of the descending carrier using, and descending carrier is backward compatibility or non-backward compatible, adopts corresponding reference signal sequence to detect.If what use is backward compatibility carrier wave, use the downlink reference signal sequence the same with formula (1) to detect, if what use is non-backward compatible carrier waves, carrier frequency point order or other mapping relations in non-backward compatible carrier waves according to this carrier wave, select corresponding reference signal sequence to detect, for example the carrier frequency point of certain non-backward compatible carrier waves, according to order from high to low, is arranged i, selects S _i+1.

As shown in Figure 3, the application of installation of the embodiment of the present invention, in the base station of advanced long-term evolution system, comprising: connected generation module, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer;

Described grouping module is organized short sequence for described long sequence is divided into K, sends to selection module;

Described selection module, for selecting described K to organize one group of short sequence of short sequence as the reference signal sequence of the descending carrier use of backward compatibility, selects K to organize the reference signal sequence that one or more groups the short sequence in short sequence is used as non-backward compatible carrier waves.

Specifically, corresponding scheme 1,

Described generation module is used for generating following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is for being divided into 2 groups of short sequences by described long sequence;

Described selection module is used for selecting short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles.

Corresponding scheme 2,

Described generation module is used for generating following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is for being divided into N by described long sequence _{non_Max}+ 1 group of short sequence;

Described selection module is used for selecting short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Described selection module is used for selecting N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility.

Described selection module is also for according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{non_Max}the reference signal sequence that+1 group of short sequence is used as the descending carrier of non-backward compatible.

The application of installation of the embodiment of the present invention is in base station and the terminal of advanced long-term evolution system, and described base station comprises connected successively generation module, grouping module and selection module, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is greater than 1 integer;

Described grouping module is organized short sequence for described long sequence is divided into K, sends to selection module;

Described selection module, for selecting described K to organize one group of short sequence of short sequence as the reference signal sequence of the descending carrier use of backward compatibility, selects K to organize the reference signal sequence that one or more groups the short sequence in short sequence is used as non-backward compatible carrier waves;

The corresponding relation of the reference signal sequence that described detection module is appointed for basis and base station and the attribute of descending carrier, and the attribute of the descending carrier using, adopt corresponding reference signal sequence to detect.

For the ease of understanding the present invention, below in conjunction with concrete application example, the present invention is further set forth.

Suppose that LTE-A cell downlink has 4 carrier waves, CC ₁, CC ₂, CC ₃and CC ₄.CC wherein ₁and CC ₂for backward compatibility carrier wave, CC ₃and CC ₄for non-backward compatible carrier waves, and in this LTE-A system, the maximum non-backward compatible carrier waves number in single subdistrict is 2.

Scheme 1 application example is as follows:

First according to the descending specific reference signals sequence in LTE Release 8, generate formula and produce long sequence, long sequence is shown in formula (8).

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(8\right)$

Then the reference signal sequence generating unit in Fig. 1 is divided into two groups long sequence, is designated as S ₁and S ₂.

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(9\right)$

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(10\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Two groups of sequences are deposited in to the reference signal sequence memory of base station end and terminal.

During base station end downlink, select corresponding reference signal sequence, CC ₁and CC ₂select the S in reference signal sequence memory ₁, CC ₃and CC ₄select the S in reference signal sequence memory ₂.

LTE-A terminal selects suitable reference sequences to detect according to the attribute of used descending carrier.When using CC ₁or CC ₂time, control part is selected reference signal sequence S ₁detect; When using CC ₃or CC ₄time, control part is selected reference signal sequence S ₂carry out the detection of reference signal.

Scheme 2 application examples are as follows:

First according to the descending specific reference signals sequence in LTE Release 8, generate formula and produce long sequence, long sequence is shown in formula (8).

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2\×(2+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(11\right)$

Then the reference signal sequence generating unit in Fig. 1 is divided into three groups long sequence, is designated as S ₁, S ₂and S ₃.

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(12\right)$

$S_2=r_l,n_s\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(13\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$S_3=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=4N_{\mathrm{RB}}^{\max ,\mathrm{DL}},4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,6N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(14\right)$

Three groups of sequences are deposited in to the reference signal sequence memory of base station end and terminal.

During base station end downlink, select corresponding reference signal sequence, CC ₁and CC ₂select the S in reference signal sequence memory ₁, CC ₃select the S in reference signal sequence memory ₂, CC ₄select the S in reference signal sequence memory ₃.

LTE-A terminal selects suitable reference sequences to detect according to the attribute of used descending carrier.When using CC ₁or CC ₂time, control part is selected reference signal sequence S ₁detect; When using CC ₃time, control part is selected reference signal sequence S ₂carry out the detection of reference signal, when using CC ₄time, control part is selected reference signal sequence S ₃carry out the detection of reference signal.

We have carried out CM emulation experiment, and simulating scenes is the transmission of downlink reference signal in LTE-A system, and simulation parameter is in Table 1.

Table 1 simulation parameter

Note: for justice comparison, when the situation of imitative 1 non-backward compatible carrier waves, when cell downlink carrier wave is two, we also reverse to one of them descending carrier when the scheme of imitative TI.When the situation of imitative 2 non-backward compatible carrier waves, the scheme that we suppose TI is reversed for 2 descending carriers wherein.The scene of 3 above non-backward compatible carrier waves may occur hardly in LTE-A system, therefore at this, has omitted the emulation of this kind of scene.

Table 2 only has the situation of reference signal

N cc(carrier number)	1	2	3	4	5
						Basic scheme	3.24	6.49	8.40	9.75	10.50
The scheme of TI (1 non-backward compatible	N/A	6.41	4.30	3.22	4.30

Carrier wave)
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.25	4.01	5.97	7.67
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.25	4.01	5.97	7.67
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	4.30	6.49	6.31
Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	4.18	4.94	5.88
						Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	2.92	3.62	4.75

Table 3 data+reference signal (0dB)

N cc(carrier number)

1

2

3

4

5

Basic scheme	3.37	3.44	3.50	3.56	3.63
						The scheme of TI (1 non-backward compatible carrier waves)	N/A	3.43	3.39	3.38	3.39
Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.38	3.39	3.42	3.47
						Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.38	3.39	3.42	3.47
The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.39	3.44	3.43
						Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.39	3.41	3.43
Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	3.38	3.38	3.40

Table 4 data+reference signal (3dB)

N cc(carrier number)	1	2	3	4	5
						Basic scheme	3.40	3.64	3.87	4.11	4.35
The scheme of TI (1 non-backward compatible carrier waves)	N/A	3.62	3.46	3.42	3.46
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.42	3.46	3.59	3.75
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.42	3.46	3.59	3.75
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.46	3.64	3.60
Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.46	3.53	3.60

Scheme 2 (2 non-backward compatible carrier waves)

N/A

N/A

3.41

3.43

3.49

Table 5 data+reference signal (6dB)

N cc(carrier number)	1	2	3	4	5
						Basic scheme	3.64	4.36	5.02	5.64	6.21
The scheme of TI (1 non-backward compatible carrier waves)	N/A	4.33	3.82	3.66	3.79
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.67	3.82	4.23	4.75
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.67	3.82	4.23	4.75
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.81	4.35	4.25

Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.85	4.03	4.26
						Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	3.63	3.72	3.92

Wherein, basic scheme refers to traditional each polymerization carrier wave under same power amplifier and according to Cell Identity CI, generates the scheme of identical reference signal sequence.

From table 2 to table 5, we can obtain drawing a conclusion:

When LTE-A community only configures a non-backward compatible carrier waves, our scheme 1 is low with the CM value of comparing when cell configuration is descending 2 and 3 carrier waves of TI, high but the CM value when cell configuration is descending 4,5 carrier waves is wanted.Compare with basic scheme, all lower in any situation CM value.When two non-backward compatible carrier waves of LTE-A cell configuration, our scheme 1 and scheme 2 are substantially all good than the scheme of TI, and wherein the performance of scheme 2 is best.From the angle realizing, our scheme does not need that the sequence of LTE Release 8 is generated to formula and carries out any change, be only the sequence used of non-backward compatible carrier waves in long sequence, the sequence except first paragraph.And the scheme of TI will be reversed to the sequence generation of downlink reference signal, be therefore to larger change of LTE Release 8 standard.In addition, in LTE-A system configuration, three of the single frequency range configurations scenes with up-downgoing polymerization carrier wave are rare, so comprehensively, at LTE-A system configuration descending carrier number, be not a lot of in the situation that, our scheme has obvious advantage.

Certainly; scheme 1 and scheme 2 be preferred embodiment just; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1. in carrier aggregation scene, reduce a method of reference signal cubic measure CM, be applied to advanced long-term evolution system, comprising:

Base station generates a long sequence according to following formula:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein,

for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Base station is divided into 2 groups of short sequences by described long sequence, and selects short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles.

2. the method for claim 1, is characterized in that,

Described base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier;

Terminal, according to the attribute of the descending carrier using, adopts corresponding reference signal sequence to detect;

The attribute of described descending carrier refers to: described descending carrier is backward compatibility or non-backward compatible.

3. in carrier aggregation scene, reduce a method of reference signal cubic measure CM, be applied to advanced long-term evolution system, comprising:

Base station generates a long sequence according to following formula:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein,

for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence, N _{non_Max}maximum number for the descending carrier of non-backward compatible;

Base station is divided into N by described long sequence _{non_Max}+ 1 group of short sequence, and select short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Base station selected N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility.

4. method as claimed in claim 3, is characterized in that, base station is according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{non_Max}the reference signal sequence that+1 group of short sequence is used as the descending carrier of non-backward compatible.

5. the method as described in any one in claim 3～4, is characterized in that,

Described base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier;

Terminal, according to the attribute of the descending carrier using, adopts corresponding reference signal sequence to detect;

The attribute of described descending carrier refers to: described descending carrier is backward compatibility or non-backward compatible.

6. in carrier aggregation scene, reduce a device for reference signal CM, be applied to the base station of advanced long-term evolution system, it is characterized in that, comprising: connected generation module, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein,

for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Described grouping module, for described long sequence is divided into 2 groups of short sequences, sends to selection module;

Described selection module is used for selecting short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles.

7. in carrier aggregation scene, reduce a device for reference signal CM, be applied to the base station of advanced long-term evolution system, it is characterized in that, comprising: connected generation module, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence, N _{non_Max}maximum number for the descending carrier of non-backward compatible;

Described grouping module is for being divided into N by described long sequence _{non_Max}+ 1 group of short sequence; Send to selection module;

Described selection module is used for selecting short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Described selection module is used for selecting N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility.

8. device as claimed in claim 7, is characterized in that,

Described selection module is also for according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{non_Max}the reference signal sequence that+1 group of short sequence is used as the descending carrier of non-backward compatible.

9. in a carrier aggregation scene, reduce the device of reference signal CM, be applied to base station and the terminal of advanced long-term evolution system, it is characterized in that, described base station comprises connected successively generation module, grouping module and selection module, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein,

for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence;

Described grouping module, for described long sequence is divided into 2 groups of short sequences, sends to selection module;

Described selection module is used for selecting short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,\·\·\·,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all non-backward compatibles;

The corresponding relation of the reference signal sequence that described detection module is appointed for basis and base station and the attribute of descending carrier, and the attribute of the descending carrier using, adopt corresponding reference signal sequence to detect.

10. in a carrier aggregation scene, reduce the device of reference signal CM, be applied to base station and the terminal of advanced long-term evolution system, it is characterized in that, described base station comprises connected successively generation module, grouping module and selection module, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein,

for the maximum resource piece number of downlink transfer, n _sbe a time slot label in radio frames, l is an OFDM symbol sequence number in time slot, and c (i) is a pseudo random sequence, N _{non_Max}maximum number for the descending carrier of non-backward compatible;

Described grouping module is for being divided into N by described long sequence _{non_Max}+ 1 group of short sequence, sends to selection module;

Described selection module is used for selecting short sequence S ₁:

$S_1{=r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},\·\·\·,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence using as the descending carrier of all backward compatibility;

Described selection module is used for selecting N _{non_Max}in+1 group of short sequence, remove short sequence S ₁the reference signal sequence that other short sequence is in addition used as the descending carrier of each non-backward compatible respectively, the corresponding short sequence of descending carrier of each backward compatibility;

The corresponding relation of the reference signal sequence that described detection module is appointed for basis and base station and the attribute of descending carrier, and the attribute of the descending carrier using, adopt corresponding reference signal sequence to detect.

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