CN101815047B

CN101815047B - Method and device for mapping demodulation pilots and physical resource block

Info

Publication number: CN101815047B
Application number: CN2009100047882A
Authority: CN
Inventors: 姜静; 孙云锋; 段亚军
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-02-25
Filing date: 2009-02-25
Publication date: 2013-12-04
Anticipated expiration: 2029-02-25
Also published as: CN101815047A

Abstract

The invention discloses a method and a device for mapping demodulation pilots and physical resource block, wherein the method comprises the steps of: setting an initial position: an initial position group is set; setting frequency domain interval: for the demodulation pilots mapped to the same time domain, the frequency domain interval of the demodulation pilots in the same path is set as 2 to 5 subcarriers and the frequency domain interval of the demodulation pilots in the different paths is set as 2 subcarriers; setting time domain interval: the demodulation pilots in the same path are mapped to different time domains and the frequency domain interval thereof is set as 2 or 3 OFDM symbols; initial mapping: for the demodulation pilots in each path, the first demodulation pilot thereof is mapped to any initial position in the initial position group; and mapping all the demodulation pilots, except for the first demodulation pilot, in each path according to the initial position, the frequency domain interval setting and the time domain interval setting of the demodulation pilots in each path as well as according to predetermined rules. The method and the device enhance system performance in case of the same pilot overhead.

Description

The mapping method of demodulation pilot frequency and Physical Resource Block and device

Technical field

The present invention relates to the communications field, and especially, relate to a kind of mapping method and device of demodulation pilot frequency.

Background technology

In order to improve the throughput of community, carry out the interference coordination of minizone, the new generation of wireless way system, for example, advanced long-term evolution system (Long-Term Evolution advanced, referred to as LTE-Advance) and senior international wireless communication system (InternationalMobile Telecommunication advanced, referred to as IMT-Advanced) etc., cooperation transmission technology (Coordinate MultipointTransmission and Reception, referred to as COMP) and the multi-flow beam all introduced between network level form technology.

At third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) carried out as given a definition in LTE,, the special demodulating signal that using descending special pilot frequency as mobile terminal, (can be called again subscriber equipment (User Equipment, referred to as UE)).

The LTE standard definition mapping method of descending special pilot frequency and Physical Resource Block.In this system, the mapping method of demodulation pilot frequency and Physical Resource Block is when adopting wave beam to form descending special pilot frequency, inserts four road public guide frequencies, for the detection of omnidirectional's control channel, wherein, the mapping relations of four road public guide frequencies and minimum Physical Resource Block as shown in Figure 1.In Fig. 1, show public guide frequency that antenna port 0 to 3 transmits respectively and the situation of resource element, and, on frequency domain, comprise on 12 subcarriers, time domain in the Physical Resource Block that comprises 12 OFDM symbols (on time domain, length is 1ms), descending special pilot frequency R on a plurality of resource elements (k, l) and antenna port 5 is arranged _d.

But, in current LTE system, dedicated pilot has only defined a road, so this descending special pilot frequency only can form and provide support the wave beam of single current; And in the situation that multi-cell cooperating transmission, the demodulation that descending special pilot frequency only can the Dui Yige community provides support, or support a plurality of communities to adopt identical pilot tone and the receiving terminal cooperation transmission mode merged of directly being eated dishes without rice or wine.

In order to support abundanter cooperation transmission technology or multi-flow beam to form in the LTE-Advanced system, need the definition demodulation pilot frequency as each community demodulated reference signal independently, thereby make a plurality of communities can adopt different demodulation pilot frequencies to carry out independent demodulation.

Yet, not yet propose at present to realize that a plurality of communities adopt different demodulation pilot frequencies to carry out the resource block mapping scheme of independent demodulation.

Summary of the invention

Consider in correlation technique owing to lacking and can realize that the problem that resource block mapping scheme that a plurality of communities adopt different demodulation pilot frequencies to carry out independent demodulation affects the demodulation performance of demodulation pilot frequency makes the present invention, for this reason, main purpose of the present invention is to provide a kind of mapping scheme of demodulation pilot frequency.

According to an aspect of the present invention, the mapping method of a kind of demodulation pilot frequency and Physical Resource Block is provided, the method can be for the mapping of long evolving system multi-channel demodulator pilot tone and Physical Resource Block, wherein, Physical Resource Block comprises 12 subcarriers at frequency domain, comprising 12 OFDM symbols in time domain is the OFDM symbol, and every road demodulation pilot frequency includes a plurality of demodulation pilot frequencies.

According to the mapping method of demodulation pilot frequency of the present invention and Physical Resource Block, comprise: the initial position set handling arranges the initial position group, wherein, the initial position group comprises a plurality of initial positions, and wherein, initial position means with A and D, A is frequency domain initial position, and D is the time domain initial position; The frequency domain interval set handling, for the demodulation pilot frequency that is mapped to same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers; The time domain interval set handling, during to different time domain, be set to 2 or 3 OFDM symbols by its time domain by same road demodulation pilot frequency mapping; Initial mapping processing, for each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in the initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical; The mapping of carrying out other demodulation pilot frequencies except first demodulation pilot frequency in the demodulation pilot frequency of every road according to initial position, frequency domain interval set handling and time domain interval set handling and the pre-defined rule of every road demodulation pilot frequency is processed.

Wherein, the initial position in the initial position group comprises: A=1, D=4; A=2, D=4; A=3, D=4; A=4, D=4; A=5, D=4; A=6, D=4; A=1, D=5; A=2, D=5; A=3, D=5; A=4, D=5; A=5, D=5; A=6, D=5; A=1, D=6; A=2, D=6; A=3, D=6; A=4, D=6; A=5, D=6; A=6, D=6.

Preferably, above-mentioned pre-defined rule is: on same time domain, shine upon 4 demodulation pilot frequencies; For the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, M=A+2, or M=A 1; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, perhaps, M=A+5, or, M=A 1, or M=A 4; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; Perhaps, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+4) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, M=A+4, or M=A 2; The frequency domain position that is mapped to first demodulation pilot frequency of (D+7) individual OFDM symbol in time domain is set to be positioned at N subcarrier, wherein, and N=A+2, or, N=A+1.

Wherein, for the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the mapping processing of carrying out other demodulation pilot frequencies except first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+3) individual subcarrier; The 3rd demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier; The 4th demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+9) individual subcarrier; The 5th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier; The 6th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+3) individual subcarrier; The 7th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier; The 8th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+9) individual subcarrier; The 9th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to A subcarrier; The tenth demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+3) individual subcarrier; The 11 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier; The 12 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+9) individual subcarrier.

Wherein, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the mapping processing of carrying out other demodulation pilot frequencies except first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier; The 3rd demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier; The 4th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier; The 5th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to A subcarrier; The 6th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier.

In addition, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the mapping processing of carrying out other demodulation pilot frequencies except first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier; The 3rd demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier; The 4th demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier; The 5th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, at frequency domain, is mapped to N subcarrier; The 6th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier.

According to another aspect of the present invention, the mapping device of a kind of demodulation pilot frequency and Physical Resource Block is provided, this device can be for the mapping of long evolving system multi-channel demodulator pilot tone and Physical Resource Block, wherein, Physical Resource Block comprises 12 subcarriers at frequency domain, comprising 12 OFDM symbols in time domain is the OFDM symbol, and every road demodulation pilot frequency includes a plurality of demodulation pilot frequencies.

According to the mapping device of demodulation pilot frequency of the present invention and Physical Resource Block, comprise: initial position set handling module, for the initial position group is set, wherein, the initial position group comprises a plurality of initial positions, and wherein, initial position means with A and D, A is frequency domain initial position, and D is the time domain initial position; Frequency domain interval set handling module, for to being mapped to the demodulation pilot frequency of same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers; Time domain interval set handling module, for during to different time domain, being set to 1 or 5 OFDM symbols by its time domain by same road demodulation pilot frequency mapping; The initial mapping processing module, for to each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in the initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical; The mapping processing module, carry out the mapping processing of other demodulation pilot frequencies of every road demodulation pilot frequency except first demodulation pilot frequency for the initial position according to every road demodulation pilot frequency, frequency domain interval set handling and time domain interval set handling and pre-defined rule.

By technique scheme of the present invention, position by clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, while having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, in the version of existing LTE standard, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow, can be in the situation that the same pilot expense realizes higher systematic function; And, the processing weights that comprise real channel information and wave beam formation by the channel information that makes the multi-channel demodulator pilot frequency acquisition, many antenna weightings weights of each data flow while making each community form without feedback many antenna weightings weights of each community or wave beam, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that a plurality of communities adopt different dedicated pilots to carry out independent demodulation and Shi Ge road dedicated pilot is uniformly distributed in time domain and frequency domain, thereby can improve the overall performance of the quality improvement system of channel estimating.

The accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:

Fig. 1 is the mapping schematic diagram of descending special pilot frequency on Physical Resource Block according to correlation technique;

Fig. 2 is the flow chart according to the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 3 is the schematic diagram according to the processing example 1 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 4 is the schematic diagram according to the processing example 2 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 5 is the schematic diagram according to the processing example 3 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 6 is the schematic diagram according to the processing example 4 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 7 is the schematic diagram according to the processing example 5 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 8 is the schematic diagram according to the processing example 6 of the mapping method of the demodulation pilot frequency of the inventive method embodiment and Physical Resource Block;

Fig. 9 is the structured flowchart according to the mapping device of the demodulation pilot frequency of apparatus of the present invention embodiment and Physical Resource Block.

Embodiment

Functional overview

In the version of existing Long Term Evolution (LTE) standard, when the base station end adopts the wave beam that is greater than 4 antennas to form, public guide frequency can't obtain whole channel informations, also can exist wave beam to form the feedback overhead problem of weights.Consider that wave beam forms descending special pilot frequency through the too much weighting processing of antenna, not only many transmit antennas can be processed to a synthetic antenna port by the weighting of many antennas, can estimate the channel information of all transmitting antennas by a road descending special pilot frequency, and descending special pilot frequency can estimate the channel information of processing through too much antenna weighting, therefore adopting descending special pilot frequency is that an expense is little, the solution that performance is good.

But, according to correlation technique, the mapping method of descending special pilot frequency in Physical Resource Block can not realize that a plurality of communities adopt different dedicated pilots to carry out the problem of independent demodulation, the present invention is with reference to the design of descending special pilot frequency, a kind of expense has been proposed little, the long loop prefix frame structure demodulation pilot frequency that performance is excellent and the mapping scheme of Physical Resource Block, the clear and definite position of frequency pilot sign in Physical Resource Block, , defined on which position of the long loop prefix frame structure of demodulation pilot frequency in the LTE system and sent, how are the time domain interval of its transmission and frequency domain interval, for demodulation pilot frequency is worked and is provided the foundation in the LTE system, make existing LTE version when the dedicated pilot design of using according to the embodiment of the present invention, can be with less expense, simultaneously with performance preferably, support wave beam to form.Above-mentioned long loop prefix frame structure refers to Resource Block (Resource Block is called for short RB), and it comprises 12 subcarriers on frequency domain, in time domain, comprises 12 OFDM symbols.Based on Physical Resource Block as described herein, will provide the embodiment of the present invention for the frame structure of long loop prefix (Extend cyclic prefix).Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.

According to the embodiment of the present invention, a kind of demodulation pilot frequency mapping method is provided, the method can adopt the frame structure of long loop prefix for the LTE system, and (RB comprises 12 subcarriers at frequency domain, comprise 12 OFDM symbols in time domain) in the mapping of demodulation pilot frequency and Physical Resource Block, for at long evolving system by least one road demodulation pilot frequency mapping of long loop prefix frame structure to Physical Resource Block, wherein ，Mei road demodulation pilot frequency includes a plurality of demodulation pilot frequencies.

Fig. 2 is the flow chart according to the mapping method of the demodulation pilot frequency of the embodiment of the present invention and Physical Resource Block, and as shown in Figure 2, the method comprises following processing (step S202 is to step S210).

Step S202, the initial position set handling, arrange the initial position group, and wherein, described initial position group comprises a plurality of initial positions, and wherein, described initial position means with A and D, and A is frequency domain initial position, D is the time domain initial position;

Step S204, the frequency domain interval set handling, for the demodulation pilot frequency that is mapped to same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers;

Step S206, the time domain interval set handling, during to different time domain, be set to 1 or 5 OFDM symbols by its time domain by same road demodulation pilot frequency mapping;

Step S208, initial mapping processing, for each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in the initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical;

Step S210, the mapping of carrying out other demodulation pilot frequencies except first demodulation pilot frequency in the demodulation pilot frequency of every road according to initial position, frequency domain interval set handling and time domain interval set handling and the pre-defined rule of every road demodulation pilot frequency is processed.

Below describe the processing of above-mentioned each step in detail:

(1) step S202: initial position set handling

At first, set in advance the initial position group, this initial position group comprises a plurality of initial positions, D is set to the time domain initial position, A is set to: identical with the position on the residing subcarrier of first public guide frequency on each OFDM symbol of minimal physical Resource Block, that is, A is for to be positioned at same sub-carrier with the first row public guide frequency of Resource Block.Particularly, the initial position in the initial position group can be: A=1, D=4; A=2, D=4; A=3, D=4; A=4, D=4; A=5, D=4; A=6, D=4; A=1, D=5; A=2, D=5; A=3, D=5; A=4, D=5; A=5, D=5; A=6, D=5; A=1, D=6; A=2, D=6; A=3, D=6; A=4, D=6; A=5, D=6; A=6, D=6.

(2) step S204: frequency domain interval set handling (or being called frequency domain density set handling)

The present invention determines in a RB, and for each road demodulation pilot frequency, each wave beam forms demodulation pilot frequency at 2 of frequency domain interval or 5 subcarriers; When a plurality of RB send together, the frequency domain density of dedicated pilot keeps being uniformly distributed, 2 or 5, interval subcarrier.

The dedicated pilot symbol density slotting at frequency domain is determined by coherence bandwidth, is therefore the distortion of avoiding channel estimating, and the minimum of pilot density is determined by nyquist sampling theorem.Specially for the scene of large covering, more obvious in the frequency choosing decline of this scene lower channel due to the frame structure of long CP, be further to guarantee the performance of channel estimating, we use the number of pilot symbols of four times of sampling thheorems, the frequency domain interval S of pilot tone in the present invention _fShown in (1):

Formula (1)

In formula 1, Δ f is subcarrier spacing, τ _maxFor the maximum delay of channel, this parameter is with reference to 3GPP TR25.996.Therefore, the design of the dedicated pilot of frequency domain interval 2 subcarriers can meet the requirement of channel estimating fully.

(3) step S206: time domain interval set handling (or being called the time domain density set handling);

The frequency pilot sign density slotting in time domain is by determining coherence time, and for avoiding the distortion of channel estimating, the minimum of pilot density is determined by nyquist sampling theorem.In order further to improve the performance of channel estimating, use the number of pilot symbols of sampling thheorem twice in the present invention, the time domain interval S of pilot tone _tShown in (2):

Formula (2)

In formula (2), f _dFor maximum doppler frequency, the maximum translational speed of LTE regulation UE is 350km/h, at this, and f _d=648Hz.T _fIt is the time of an OFDM symbol.Two～tri-, demodulation pilot frequency interval OFDM symbol, meet the requirement of channel estimating under can be at a high speed.

By above-mentioned time domain interval and the set handling of frequency domain interval, make dedicated pilot very even in time domain and frequency domain distribution, can guarantee the quality of channel estimating.

(4) step S206, initial mapping processing

For each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in described initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical.This dedicated pilot is reasonable in design in the original position of time domain, in the situation that the same pilot expense, performance is more excellent.

(1) frequency domain original position

The first row wave beam form demodulation pilot frequency at frequency domain from first subcarrier, dedicated pilot and public guide frequency position are closed on, as Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Fig. 7, wave beam forms weights to be estimated to obtain after real channel by the upstream or downstream public guide frequency, and the pilot tone that is used further to adjacent position will be recovered channel information more accurately.

(2) time domain original position

The frequency domain original position of demodulation pilot frequency is the 4th, 5,6 OFDM symbols, can guarantee that dedicated pilot is uniform in Physical Resource Block, realizes better channel estimating performance.

(5) step S210

In this step, on same time domain, shine upon 4 demodulation pilot frequencies;

For the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, or, M=A-1; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol;

For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, perhaps, M=A+5, or, M=A-1, or, M=A-4; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol;

For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+4) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+4, or, M=A-2; The frequency domain position that is mapped to first demodulation pilot frequency of (D+7) individual OFDM symbol in time domain is set to be positioned at N subcarrier, wherein, and N=A+2, or, N=A+1.

Wherein, for every road demodulation pilot frequency, the operation that the mapping of other demodulation pilot frequencies except described first demodulation pilot frequency is processed can be divided into following two kinds of situations:

Situation one: for the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is treated to:

Second demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+3) individual subcarrier;

The 3rd demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier;

The 4th demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+9) individual subcarrier;

The 5th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier;

The 6th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+3) individual subcarrier;

The 7th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier;

The 8th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+9) individual subcarrier;

The 9th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to A subcarrier;

The tenth demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+3) individual subcarrier;

The 11 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier;

The 12 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+9) individual subcarrier.

Situation two: for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is treated to:

Second demodulation pilot frequency is mapped to D OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier;

The 3rd demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier;

The 4th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier;

The 5th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to A subcarrier;

The 6th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier.

Situation three:

For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is processed and is comprised:

The 3rd demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, at frequency domain, is mapped to M subcarrier;

The 4th demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, at frequency domain, is mapped to (M+6) individual subcarrier;

The 5th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, at frequency domain, is mapped to N subcarrier;

The 6th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, at frequency domain, is mapped to (A+6) individual subcarrier.

By technique scheme of the present invention, position by clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, while having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, in the version of existing LTE standard, demodulation pilot frequency can't obtain the problem of the channel information of a plurality of data flow, can be in the situation that the same pilot expense realizes higher systematic function; And, the processing weights that comprise real channel information and wave beam formation by the channel information that makes the multi-channel demodulator pilot frequency acquisition, many antenna weightings weights of each data flow while making each community form without feedback many antenna weightings weights of each community or wave beam, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that a plurality of communities adopt different dedicated pilots to carry out independent demodulation and Shi Ge road dedicated pilot is uniformly distributed in time domain and frequency domain, thereby can improve the overall performance of the quality improvement system of channel estimating.

According to above step and design principle, further illustrate the mapping process of demodulation pilot frequency of the present invention below by concrete example, wherein, and in Fig. 3 to Fig. 8 of following description institute combination, the R in figure ₁Mean the 1st road demodulation pilot frequency, R ₀Expression in figure the 2nd road demodulation pilot frequency, the R in figure ₂Mean the 3rd road demodulation pilot frequency, the R in figure ₃Mean the 4th road demodulation pilot frequency.

Example 1

The mapping relations schematic diagram of descending special pilot frequency as shown in Figure 3 and Physical Resource Block, as shown in Figure 3, comprise 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Mean the 1st road descending special pilot frequency, R ₁Mean the 2nd road descending special pilot frequency, R ₂Mean the 3rd road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, below respectively the mapping of this 3 road descending special pilot frequency is processed and is elaborated.

The 1st road descending special pilot frequency R ₁:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A1=1, D1=5, can be respectively be mapped to D1=5, D1+3=8, a D1+6=11 OFDM symbol by descending special pilot frequency in time domain.

Based on foregoing, the operation of carrying out the mapping processing of other descending special pilot frequencies except first descending special pilot frequency in this road descending special pilot frequency in step S210 is specially:

Second descending special pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A1+3=4 subcarrier;

The 3rd descending special pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A1+6=7 subcarrier;

The 4th descending special pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A1+9=10 subcarrier;

The 5th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M=A1+2=3 subcarrier;

The 6th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M+3=6 subcarrier;

The 7th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M+6=9 subcarrier;

The 8th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M+9=12 subcarrier;

The 9th descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1=1 subcarrier;

The tenth descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1+3=4 subcarrier;

The 11 descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1+6=7 subcarrier;

The 12 descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1+9=10 subcarrier.

The 2nd road descending special pilot frequency R ₂:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A2=1, D2=4, can be respectively be mapped to D2=4, D2+3=7, a D2+6=10 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=4 subcarrier;

The 3rd descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=7 subcarrier;

The 4th descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=10 subcarrier;

The 5th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M=A2+2=3 subcarrier;

The 6th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+3=6 subcarrier;

The 7th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+6=9 subcarrier;

The 8th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+9=12 subcarrier;

The 9th descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2=1 subcarrier;

The tenth descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=4 subcarrier;

The 11 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=7 subcarrier;

The 12 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=10 subcarrier.

The 3rd road descending special pilot frequency R ₃:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A3=1, D3=6, can be respectively be mapped to D3=6, D3+3=9, a D3+6=12 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+3=4 subcarrier;

The 3rd descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+6=7 subcarrier;

The 4th descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+9=10 subcarrier;

The 5th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A3+2=3 subcarrier;

The 6th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+3=6 subcarrier;

The 7th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=9 subcarrier;

The 8th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+9=12 subcarrier;

The 9th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3=1 subcarrier;

The tenth descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+3=4 subcarrier;

The 11 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+6=7 subcarrier;

The 12 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+9=10 subcarrier.

It should be noted that, when system is only used a road descending special pilot frequency, can adopt the pilot tone pattern of Fig. 1, when system is used three road descending special pilot frequency Zhong De bis-road descending special pilot frequencies, can only send the two road descending special pilot frequencies that use, the resource element that another road descending special pilot frequency takies still sends data, and for example, system is used the descending special pilot frequency R in Fig. 3 ₀And R ₁, R ₂The resource element taken sends data.

Example 2

The mapping relations schematic diagram of descending special pilot frequency as shown in Figure 4 and Physical Resource Block, as shown in Figure 4, comprise 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Mean the 1st road descending special pilot frequency, R ₁Mean the 2nd road descending special pilot frequency, R ₂Mean the 3rd road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, below respectively the mapping of this 3 road descending special pilot frequency is processed and is elaborated.

The 1st road descending special pilot frequency R ₀:

The 2nd road descending special pilot frequency R ₁:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A2=3, D2=4, can be respectively be mapped to D2=4, D2+3=7, a D2+6=10 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=6 subcarrier;

The 3rd descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=9 subcarrier;

The 4th descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=12 subcarrier;

The 5th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M=A2-1=2 subcarrier;

The 6th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+3=5 subcarrier;

The 7th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+6=8 subcarrier;

The 8th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+9=11 subcarrier;

The 9th descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2=3 subcarrier;

The tenth descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=6 subcarrier;

The 11 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=9 subcarrier;

The 12 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=12 subcarrier.

The 3rd road descending special pilot frequency R ₂:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A3=2, D3=6, can be respectively be mapped to D3=6, D3+3=9, a D3+6=12 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+3=5 subcarrier;

The 3rd descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+6=8 subcarrier;

The 4th descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+9=11 subcarrier;

The 5th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A3-1=1 subcarrier;

The 6th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+3=4 subcarrier;

The 7th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=7 subcarrier;

The 8th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+9=10 subcarrier;

The 9th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3=2 subcarrier;

The tenth descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+3=5 subcarrier;

The 11 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+6=8 subcarrier;

The 12 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+9=11 subcarrier.

Example 3

The mapping relations schematic diagram of descending special pilot frequency as shown in Figure 5 and Physical Resource Block, as shown in Figure 5, comprise 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Mean the 1st road descending special pilot frequency, R ₁Mean the 2nd road descending special pilot frequency, R ₂Mean the 3rd road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, below respectively the mapping of this 3 road descending special pilot frequency is processed and is elaborated.

The 1st road descending special pilot frequency R ₀:

The 2nd road descending special pilot frequency R ₁:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A2=2, D2=4, can be respectively be mapped to D2=4, D2+3=7, a D2+6=10 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=5 subcarrier;

The 4th descending special pilot frequency is mapped to the 4th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=11 subcarrier;

The 5th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M=A2-1=1 subcarrier;

The 6th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+3=4 subcarrier;

The 7th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+6=7 subcarrier;

The 8th descending special pilot frequency is mapped to the 7th OFDM symbol in time domain, at frequency domain, is mapped to M+9=10 subcarrier;

The 9th descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2=2 subcarrier;

The tenth descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+3=5 subcarrier;

The 11 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=8 subcarrier;

The 12 descending special pilot frequency is mapped to the 10th OFDM symbol in time domain, at frequency domain, is mapped to A2+9=11 subcarrier.

The 3rd road descending special pilot frequency R ₂:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A3=3, D3=6, can be respectively be mapped to D3=6, D3+3=9, a D3+6=12 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+3=6 subcarrier;

The 3rd descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+6=9 subcarrier;

The 4th descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+9=12 subcarrier;

The 5th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A3-1=2 subcarrier;

The 6th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+3=5 subcarrier;

The 7th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=8 subcarrier;

The 8th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+9=11 subcarrier;

The 9th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3=3 subcarrier;

The tenth descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+3=6 subcarrier;

The 11 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+6=10 subcarrier;

The 12 descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+9=12 subcarrier.

Example 4

The mapping relations schematic diagram of descending special pilot frequency as shown in Figure 6 and Physical Resource Block, as shown in Figure 6, comprise 4 road descending special pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Mean the 1st road descending special pilot frequency, R ₁Mean the 2nd road descending special pilot frequency, R ₂Mean the 3rd road descending special pilot frequency, R ₃Mean the 4th road descending special pilot frequency, and, include 12 descending special pilot frequencies in the 1st road descending special pilot frequency and the 2nd road descending special pilot frequency, include 6 descending special pilot frequencies in the 3rd road descending special pilot frequency and the 4th road descending special pilot frequency, below respectively the mapping of this 4 road descending special pilot frequency is processed and is elaborated.

The 1st road descending special pilot frequency R ₀:

The 2nd road descending special pilot frequency R ₁:

The 3rd road descending special pilot frequency R ₂:

Second descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A3+6=9 subcarrier;

The 3rd descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A3+2=5 subcarrier;

The 4th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=11 subcarrier;

The 5th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3=3 subcarrier;

The 6th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A3+6=9 subcarrier;

The 4th road descending special pilot frequency R ₃:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A4=6, D4=6, can be respectively be mapped to D4=6, D4+3=9, a D4+6=12 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 6th OFDM symbol in time domain, at frequency domain, is mapped to A4+6=12 subcarrier;

The 3rd descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A4-4=2 subcarrier;

The 4th descending special pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=8 subcarrier;

The 5th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A4=6 subcarrier;

The 6th descending special pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to A4+6=12 subcarrier.

It should be noted that, when system is only used a road descending special pilot frequency, can adopt the pilot tone pattern of Fig. 1; When system is used three road descending special pilot frequency Zhong De bis-road descending special pilot frequencies, can only send the two road descending special pilot frequencies that use, the resource element that another road descending special pilot frequency takies still sends data, and for example, system is used the descending special pilot frequency R in Fig. 3 ₀And R ₁, R ₂The resource element taken sends data; When system is used four road descending special pilot frequency Zhong De bis-road descending special pilot frequencies, can only send the two road descending special pilot frequencies that use, the resource element that other two road descending special pilot frequencies take still sends data, and for example, system is used the descending special pilot frequency R in Fig. 6 ₀And R ₁, R ₂And R ₃The resource element taken sends data; When system is used four road descending special pilot frequency Zhong De tri-road descending special pilot frequencies, can only send the three road descending special pilot frequencies that use, the resource element that an other road descending special pilot frequency takies still sends data, and for example, system is used the descending special pilot frequency R in Fig. 6 ₀, R ₁And R ₂, R ₃The resource element taken sends data.

Example 5

The mapping relations schematic diagram of descending special pilot frequency as shown in Figure 7 and Physical Resource Block, as shown in Figure 7, comprise 4 road descending special pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Mean the 1st road descending special pilot frequency, R ₁Mean the 2nd road descending special pilot frequency, R ₂Mean the 3rd road descending special pilot frequency, R ₃Mean the 4th road descending special pilot frequency, and, and, include 6 descending special pilot frequencies in each road descending special pilot frequency, below respectively the mapping of this 4 road descending special pilot frequency is processed and is elaborated.

The 1st road descending special pilot frequency R ₀:

Second descending special pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A1+6=7 subcarrier;

The 3rd descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M=A1+5=6 subcarrier;

The 4th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M+6=12 subcarrier;

The 5th descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1=1 subcarrier;

The 6th descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A1+6=7 subcarrier;

The 2nd road descending special pilot frequency R ₁:

At first the initial position of this road descending special pilot frequency is set, be specially: the position of first descending special pilot frequency of Jiang Gai road descending special pilot frequency is set to A2=4, D2=5, can be respectively be mapped to D2=5, D2+3=8, a D2+6=11 OFDM symbol by descending special pilot frequency in time domain.

Second descending special pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=10 subcarrier;

The 3rd descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M=A2-1=3 subcarrier;

The 4th descending special pilot frequency is mapped to the 8th OFDM symbol in time domain, at frequency domain, is mapped to M+6=9 subcarrier;

The 5th descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A2=4 subcarrier;

The 6th descending special pilot frequency is mapped to the 11st OFDM symbol in time domain, at frequency domain, is mapped to A2+6=10 subcarrier.

The 3rd road descending special pilot frequency R ₂:

The 4th road descending special pilot frequency R ₃:

Example 6

The mapping relations schematic diagram of demodulation pilot frequency as shown in Figure 8 and Physical Resource Block, as shown in Figure 8, comprise 4 road demodulation pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Mean the 1st road demodulation pilot frequency, R ₁Mean the 2nd road demodulation pilot frequency, R ₂Mean the 3rd road demodulation pilot frequency, R ₃Mean the 4th road demodulation pilot frequency, and, and, include 6 demodulation pilot frequencies in each road demodulation pilot frequency, below respectively the mapping of this 4 road demodulation pilot frequency is processed and is elaborated.

The 1st road demodulation pilot frequency R ₀:

At first the initial position of this road demodulation pilot frequency is set, be specially: the position of first demodulation pilot frequency of Jiang Gai road demodulation pilot frequency is set to A1=1, D1=5, can be respectively be mapped to D1=5, D1+4=9, a D1+7=12 OFDM symbol by demodulation pilot frequency in time domain.

Based on foregoing, the operation of carrying out the mapping processing of other demodulation pilot frequencies except first demodulation pilot frequency in this road demodulation pilot frequency in step S210 is specially:

Second demodulation pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A1+6=7 subcarrier;

The 3rd demodulation pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A1+4=5 subcarrier;

The 4th demodulation pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=11 subcarrier;

The 5th demodulation pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to N=A1+2=3 subcarrier;

The 6th demodulation pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to N+6=9 subcarrier;

The 2nd road demodulation pilot frequency R ₁:

At first the initial position of this road demodulation pilot frequency is set, be specially: the position of first demodulation pilot frequency of Jiang Gai road demodulation pilot frequency is set to A2=4, D2=5, can be respectively be mapped to D2=5, D2+4=9, a D2+7=12 OFDM symbol by demodulation pilot frequency in time domain.

Second demodulation pilot frequency is mapped to the 5th OFDM symbol in time domain, at frequency domain, is mapped to A2+6=10 subcarrier;

The 3rd demodulation pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M=A2-2=2 subcarrier;

The 4th demodulation pilot frequency is mapped to the 9th OFDM symbol in time domain, at frequency domain, is mapped to M+6=8 subcarrier;

The 5th demodulation pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to N=A3+3=6 subcarrier;

The 6th demodulation pilot frequency is mapped to the 12nd OFDM symbol in time domain, at frequency domain, is mapped to N+6=12 subcarrier.

It should be noted that, when system is only used a road demodulation pilot frequency, can adopt the pilot tone pattern of Fig. 1; When system is used three road demodulation pilot frequency Zhong De bis-road demodulation pilot frequencies, can only send the two road demodulation pilot frequencies that use, the resource element that another road demodulation pilot frequency takies still sends data, and for example, system is used the demodulation pilot frequency R in Fig. 3 ₀And R ₁, R ₂The resource element taken sends data; When system is used four road demodulation pilot frequency Zhong De bis-road demodulation pilot frequencies, can only send the two road demodulation pilot frequencies that use, the resource element that other two road demodulation pilot frequencies take still sends data, and for example, system is used the demodulation pilot frequency R in Fig. 6 ₀And R ₁, R ₂And R ₃The resource element taken sends data; When system is used four road demodulation pilot frequency Zhong De tri-road demodulation pilot frequencies, can only send the three road demodulation pilot frequencies that use, the resource element that an other road demodulation pilot frequency takies still sends data, and for example, system is used the demodulation pilot frequency R in Fig. 6 ₀, R ₁And R ₂, R ₃The resource element taken sends data.

Device embodiment

According to the embodiment of the present invention, a kind of demodulation pilot frequency mapping device is provided, this device can adopt the frame structure of long loop prefix for the LTE system, and (RB comprises 12 subcarriers at frequency domain, comprise 12 OFDM symbols in time domain) in the mapping of demodulation pilot frequency and Physical Resource Block, for at long evolving system by least one road demodulation pilot frequency mapping of long loop prefix frame structure to Physical Resource Block, wherein ，Mei road demodulation pilot frequency includes a plurality of demodulation pilot frequencies.

Fig. 9 is the structured flowchart according to the mapping device of the demodulation pilot frequency of the embodiment of the present invention and Physical Resource Block, as shown in Figure 9, this device comprises following initial position set handling module 10, frequency domain interval set handling module 20, time domain interval set handling module 30, initial mapping processing module 40 and mapping processing module 50.

Initial position set handling module 10, for the initial position group is set, wherein, described initial position group comprises a plurality of initial positions, and wherein, described initial position means with A and D, and A is frequency domain initial position, and D is the time domain initial position;

Frequency domain interval set handling module 20, for to being mapped to the demodulation pilot frequency of same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers;

Time domain interval set handling module 30, for during to different time domain, being set to 1 or 5 OFDM symbols by its time domain by same road demodulation pilot frequency mapping;

Initial mapping processing module 40, this module can be connected to initial position set handling module 10, for to each road demodulation pilot frequency, by its first demodulation pilot frequency mapping to the arbitrary initial position in described initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical;

Mapping processing module 50, this module can be connected to frequency domain interval set handling module 20, time domain interval set handling module 30 and initial mapping processing module 40, for the initial position according to every road demodulation pilot frequency, described frequency domain interval set handling and described time domain interval set handling and pre-defined rule, carries out the mapping processing of other demodulation pilot frequencies of every road demodulation pilot frequency except described first demodulation pilot frequency.

In sum, by above-mentioned mapping of the present invention, process, the mapping of demodulation pilot frequency that not only can single channel, also contribute to adopt the demodulated reference signal of multi-channel demodulator pilot tone as cooperation cell, wherein, position by clear and definite frequency pilot sign in Physical Resource Block, while having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, in the version of existing LTE standard, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow; Secondly, the processing weights that comprise real channel information and wave beam formation by the channel information that makes the multi-channel demodulator pilot frequency acquisition, many antenna weightings weights of each data flow while making each community without the many antenna weightings weights that feed back each community or wave beam formation, thus avoided wave beam to form the feedback overhead of weights; In addition, the dedicated pilot mapping method that dedicated pilot proposes than before in the design of the original position of time domain is more reasonable, in the situation that the same pilot expense, performance is more excellent; And, because each road dedicated pilot is very even in time domain and frequency domain distribution, therefore guarantee the quality of channel estimating.

In addition, by technique scheme of the present invention, position by clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, while having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, in the version of existing LTE standard, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow, can be in the situation that the same pilot expense realizes higher systematic function; And, the processing weights that comprise real channel information and wave beam formation by the channel information that makes the multi-channel demodulator pilot frequency acquisition, many antenna weightings weights of each data flow while making each community form without feedback many antenna weightings weights of each community or wave beam, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that a plurality of communities adopt different dedicated pilots to carry out independent demodulation and Shi Ge road dedicated pilot is uniformly distributed in time domain and frequency domain, thereby can improve the overall performance of the quality improvement system of channel estimating.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively to each integrated circuit modules, perhaps a plurality of modules in them or step being made into to the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. the mapping method of a demodulation pilot frequency and Physical Resource Block, mapping for long evolving system multi-channel demodulator pilot tone and Physical Resource Block, wherein, described Physical Resource Block comprises 12 subcarriers at frequency domain, comprising 12 OFDM symbols in time domain is the OFDM symbol, and every road demodulation pilot frequency includes a plurality of demodulation pilot frequencies, it is characterized in that, described method comprises:

The initial position set handling, arrange the initial position group, and wherein, described initial position group comprises a plurality of initial positions, and wherein, described initial position means with A and D, and A is frequency domain initial position, and D is the time domain initial position;

The frequency domain interval set handling, for the demodulation pilot frequency that is mapped to same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers;

The time domain interval set handling, during to different time domain, be set to 2 or 3 OFDM symbols by its time domain by same road demodulation pilot frequency mapping;

Initial mapping processing, for each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in described initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical;

Carry out the mapping processing of other demodulation pilot frequencies except described first demodulation pilot frequency in the demodulation pilot frequency of every road according to the initial position of every road demodulation pilot frequency, described frequency domain interval set handling and described time domain interval set handling and pre-defined rule, wherein, described pre-defined rule is: on same time domain, shine upon 4 demodulation pilot frequencies; For the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, or, M=A-1; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, perhaps, M=A+5, or, M=A-1, or, M=A-4; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; Perhaps, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+4) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+4, or, M=A-2; The frequency domain position that is mapped to first demodulation pilot frequency of (D+7) individual OFDM symbol in time domain is set to be positioned at N subcarrier, wherein, and N=A+2, or, N=A+1.

2. method according to claim 1, is characterized in that, the initial position in described initial position group comprises: A=1, D=4; A=2, D=4; A=3, D=4; A=4, D=4; A=5, D=4; A=6, D=4; A=1, D=5; A=2, D=5; A=3, D=5; A=4, D=5; A=5, D=5; A=6, D=5; A=1, D=6; A=2, D=6; A=3, D=6; A=4, D=6; A=5, D=6; A=6, D=6.

3. method according to claim 1, is characterized in that, for the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is processed and comprised:

4. method according to claim 1, is characterized in that, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is processed and comprised:

5. method according to claim 1, is characterized in that, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the described mapping of carrying out other demodulation pilot frequencies except described first demodulation pilot frequency in this road demodulation pilot frequency is processed and comprised:

6. the mapping device of a demodulation pilot frequency and Physical Resource Block, mapping for long evolving system multi-channel demodulator pilot tone and Physical Resource Block, wherein, described Physical Resource Block comprises 12 subcarriers at frequency domain, comprising 12 OFDM symbols in time domain is the OFDM symbol, and every road demodulation pilot frequency includes a plurality of demodulation pilot frequencies, it is characterized in that, described device comprises:

Initial position set handling module, for the initial position group is set, wherein, described initial position group comprises a plurality of initial positions, and wherein, described initial position means with A and D, and A is frequency domain initial position, and D is the time domain initial position;

Frequency domain interval set handling module, for to being mapped to the demodulation pilot frequency of same time domain, the frequency domain interval of same road demodulation pilot frequency is set to 2 or 5 subcarriers; The frequency domain interval of not going the same way between demodulation pilot frequency is set to 2 subcarriers;

Time domain interval set handling module, for during to different time domain, being set to 1 or 5 OFDM symbols by its time domain by same road demodulation pilot frequency mapping;

The initial mapping processing module, for to each road demodulation pilot frequency, by its first demodulation pilot frequency mapping, to the arbitrary initial position in described initial position group, wherein the initial position of ，Ge road demodulation pilot frequency is all not identical;

The mapping processing module, for according to the initial position of every road demodulation pilot frequency, described frequency domain interval set handling and described time domain interval set handling and pre-defined rule, carrying out the mapping processing of other demodulation pilot frequencies of every road demodulation pilot frequency except described first demodulation pilot frequency, wherein, described pre-defined rule is: on same time domain, shine upon 4 demodulation pilot frequencies; For the arbitrary road demodulation pilot frequency that comprises 12 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, or, M=A-1; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; For the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+3) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+2, perhaps, M=A+5, or, M=A-1, or, M=A-4; To be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol; Perhaps, for the arbitrary road demodulation pilot frequency that comprises 6 demodulation pilot frequencies, the frequency domain position that is mapped to first demodulation pilot frequency of (D+4) individual OFDM symbol in time domain is set to be positioned at M subcarrier, wherein, and M=A+4, or, M=A-2; The frequency domain position that is mapped to first demodulation pilot frequency of (D+7) individual OFDM symbol in time domain is set to be positioned at N subcarrier, wherein, and N=A+2, or, N=A+1.