CN101815047A

CN101815047A - Method and device for mapping demodulation pilots and physical resource block

Info

Publication number: CN101815047A
Application number: CN200910004788A
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: 2010-08-25
Anticipated expiration: 2029-02-25
Also published as: CN101815047B

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 sub-district, 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, abbreviate LTE-Advance as) and senior international wireless communication system (InternationalMobile Telecommunication advanced, abbreviate IMT-Advanced as) etc., all introduce cooperation transmission technology (Coordinate MultipointTransmission and Reception abbreviates COMP as) and multi-flow beam formation technology between the network level.

At third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) carried out as giving a definition among the LTE, promptly, with descending special pilot frequency as the portable terminal special demodulating signal of (can be called subscriber equipment (User Equipment abbreviates UE as) again).

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

But in present LTE system, dedicated pilot has only defined one the tunnel, provides support so this descending special pilot frequency only can form the wave beam of single current; And under the situation of multi-cell cooperating transmission, descending special pilot frequency only can provide support to the demodulation of a sub-district, perhaps supports a plurality of sub-districts to adopt directly the eat dishes without rice or wine cooperation transmission mode that merges of identical pilot tone and receiving terminal.

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

Yet, the resource block mapping scheme that can realize that a plurality of sub-districts adopt different demodulation pilot frequencies to carry out independent demodulation is not proposed at present as yet.

Summary of the invention

Consider in the correlation technique owing to lacking and to realize that the problem that resource block mapping scheme that a plurality of sub-districts adopt different demodulation pilot frequencies to carry out independent demodulation influences 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, this method can be used 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.

Mapping method according to demodulation pilot frequency of the present invention and Physical Resource Block comprises: the initial position set handling is provided with the initial position group, wherein, comprise a plurality of initial positions in the initial position group, wherein, initial position is represented with A and D, A is a 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 the demodulation pilot frequency is set to 2 subcarriers; The time domain interval set handling during to different time domain, is set to 2 or 3 OFDM symbols with its time domain with same road demodulation pilot frequency mapping; Initial mapping processing, for each road demodulation pilot frequency, on the arbitrary initial position of its first demodulation pilot frequency mapping in the initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality; Handle according to the mapping that initial position, frequency domain interval set handling and time domain interval set handling and the pre-defined rule of every road demodulation pilot frequency carries out other demodulation pilot frequencies except that first demodulation pilot frequency in the demodulation pilot frequency of every road.

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, perhaps, M=A 1; It is identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol to be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain; 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, perhaps, M=A 1, and perhaps, M=A 4; It is identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol to be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain; 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, perhaps, 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, perhaps, 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 that first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, is mapped to (A+3) individual subcarrier at frequency domain; The 3rd demodulation pilot frequency is mapped to D OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain; The 4th demodulation pilot frequency is mapped to D OFDM symbol in time domain, is mapped to (A+9) individual subcarrier at frequency domain; The 5th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to M subcarrier at frequency domain; The 6th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to (M+3) individual subcarrier at frequency domain; The 7th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to (M+6) individual subcarrier at frequency domain; The 8th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to (M+9) individual subcarrier at frequency domain; The 9th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to A subcarrier at frequency domain; The tenth demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to (A+3) individual subcarrier at frequency domain; The 11 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain; The 12 demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to (A+9) individual subcarrier at frequency domain.

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 that first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain; The 3rd demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to M subcarrier at frequency domain; The 4th demodulation pilot frequency is mapped to (D+3) individual OFDM symbol in time domain, is mapped to (M+6) individual subcarrier at frequency domain; The 5th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to A subcarrier at frequency domain; The 6th demodulation pilot frequency is mapped to (D+6) individual OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain.

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 that first demodulation pilot frequency in this road demodulation pilot frequency comprises: second demodulation pilot frequency is mapped to D OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain; The 3rd demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, is mapped to M subcarrier at frequency domain; The 4th demodulation pilot frequency is mapped to (D+4) individual OFDM symbol in time domain, is mapped to (M+6) individual subcarrier at frequency domain; The 5th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, is mapped to N subcarrier at frequency domain; The 6th demodulation pilot frequency is mapped to (D+7) individual OFDM symbol in time domain, is mapped to (A+6) individual subcarrier at frequency domain.

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 used 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.

Mapping device according to demodulation pilot frequency of the present invention and Physical Resource Block comprises: initial position set handling module is used to be provided with the initial position group, wherein, comprise a plurality of initial positions in the initial position group, wherein, initial position is represented with A and D, A is a frequency domain initial position, and D is the time domain initial position; Frequency domain interval set handling module is used for being mapped to the demodulation pilot frequency of same time domain, and 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 the demodulation pilot frequency is set to 2 subcarriers; Time domain interval set handling module when being used for same road demodulation pilot frequency mapping to different time domain, is set to 1 or 5 OFDM symbols with its time domain; The initial mapping processing module is used for each road demodulation pilot frequency, and on the arbitrary initial position of its first demodulation pilot frequency mapping in the initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality; The mapping processing module is used for the mapping processing that initial position, frequency domain interval set handling and time domain interval set handling according to every road demodulation pilot frequency and pre-defined rule carry out other demodulation pilot frequencies of every road demodulation pilot frequency except that first demodulation pilot frequency.

By technique scheme of the present invention, by the position of clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, when having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow in the existing LTE standard version, can realize higher systematic function under the situation of same pilot expense; And, the processing weights that comprise real channel information and wave beam formation by the channel information that the multi-channel demodulator pilot tone is obtained, many antenna weightings weights of each data flow when making each sub-district need not to feed back many antenna weightings weights of each sub-district or wave beam to form, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that the different dedicated pilot of a plurality of sub-districts employings carries out independent demodulation and each road dedicated pilot is evenly distributed in time domain and frequency domain, thereby can improve the overall performance of the quality improvement system of channel estimating.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.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 existing Long Term Evolution (LTE) standard version, when the base station end adopted wave beam 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 the weighted of descending special pilot frequency through too much antenna, not only can be with many transmit antennas by the synthetic antenna port of the weighted of many antennas, promptly can estimate the channel information of all transmitting antennas by one road descending special pilot frequency, and descending special pilot frequency can estimate the channel information of handling 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 be realized the problem that a plurality of sub-districts adopt different dedicated pilots to carry out independent demodulation, the present invention is with reference to the design of descending special pilot frequency, it is little to have proposed a kind of expense, 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, promptly, 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, work in the LTE system for demodulation pilot frequency and to provide the foundation, make existing LTE version when the dedicated pilot design of using according to the embodiment of the invention, can support wave beam to form with more excellent performance simultaneously with less expense.Above-mentioned long loop prefix frame structure is meant Resource Block (Resource Block is called for short RB), and it comprises 12 subcarriers on frequency domain, comprise 12 OFDM symbols in time domain.Based on Physical Resource Block as described herein, will provide the embodiment of the invention at 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 is used for description and interpretation the present invention, and be not used in qualification the present invention.

According to the embodiment of the invention, a kind of demodulation pilot frequency mapping method is provided, this method can be used for the LTE system and adopt the frame structure of long loop prefix (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, be used at long evolving system at least one road demodulation pilot frequency mapping of long loop prefix frame structure to Physical Resource Block, wherein, every 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 invention and Physical Resource Block, and as shown in Figure 2, this method comprises following processing (step S202 is to step S210).

Step S202, the initial position set handling is provided with the initial position group, wherein, comprises a plurality of initial positions in the described initial position group, and wherein, described initial position represents that with A and D A is a frequency domain initial position, and 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 the demodulation pilot frequency is set to 2 subcarriers;

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

Step S208, initial mapping processing, for each road demodulation pilot frequency, on the arbitrary initial position of its first demodulation pilot frequency mapping in the initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality;

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

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, comprise a plurality of initial positions in this initial position group, 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 positioned at same sub-carrier for the first row public guide frequency with 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 (perhaps being called frequency domain density set handling)

The present invention determines that in a RB 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 sent together, the frequency domain density of dedicated pilot kept evenly distributing, at

interval

2 or 5 subcarriers.

The density that dedicated pilot symbol is inserted at frequency domain is determined that by coherence bandwidth therefore for avoiding the distortion of channel estimating, the minimum of pilot density is determined by nyquist sampling theorem.Because at the scene of big covering, more obvious in the frequency choosing decline of this scene lower channel, for further guaranteeing performance for estimating channel, we use the number of pilot symbols of four times of sampling thheorems, then the frequency domain interval S of pilot tone to the frame structure of long CP in the present invention specially _fAs the formula (1):

S_{f} = \frac{1}{4 * 2 Δf τ_{\max}} = \frac{1}{4 * 2 * 15 kHz * 3700 ns} \approx 2.5

Individual formula (1)

In formula 1, Δ f is a subcarrier spacing, τ _MaxBe 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 be satisfied the requirement of channel estimating fully.

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

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

S_{t} = \frac{1}{2 * 2 f_{d} T_{f}} = \frac{1}{2 * 2 * 648 Hz * 1 / 14 ms} \approx 5.4

Individual formula (2)

In formula (2), f _dBe 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.Demodulation pilot frequency is two～three OFDM symbols at interval, can satisfy the requirement of channel estimating at a high speed down.

By the 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, on the arbitrary initial position of its first demodulation pilot frequency mapping in the described initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality.This dedicated pilot is reasonable in design in the original position of time domain, and under the situation of 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 Figure 7, wave beam forms weights to be estimated to obtain behind the real channel by the upstream or downstream public guide frequency, and the pilot tone that is used further to the 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 an OFDM symbol, 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, perhaps, M=A-1; It is identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol to be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain;

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, perhaps, M=A-1, perhaps, M=A-4; It is identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol to be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain;

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, perhaps, 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, perhaps, N=A+1.

Wherein, for every road demodulation pilot frequency, the operation that the mapping of other demodulation pilot frequencies except that described first demodulation pilot frequency is handled 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 that 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, is mapped to (A+3) individual subcarrier at frequency domain;

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

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

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

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

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

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

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

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

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

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

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 that 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, is mapped to (A+6) individual subcarrier at frequency domain;

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

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

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

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

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 that described first demodulation pilot frequency in this road demodulation pilot frequency is handled and is comprised:

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

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

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

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

By technique scheme of the present invention, by the position of clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, when having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, demodulation pilot frequency can't obtain the problem of the channel information of a plurality of data flow in the existing LTE standard version, can realize higher systematic function under the situation of same pilot expense; And, the processing weights that comprise real channel information and wave beam formation by the channel information that the multi-channel demodulator pilot tone is obtained, many antenna weightings weights of each data flow when making each sub-district need not to feed back many antenna weightings weights of each sub-district or wave beam to form, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that the different dedicated pilot of a plurality of sub-districts employings carries out independent demodulation and each road dedicated pilot is evenly 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 specify 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 among the figure ₁Represent the 1 road demodulation pilot frequency, R ₀Expression the 2 road demodulation pilot frequency among the figure, the R among the figure ₂Represent the 3 road demodulation pilot frequency, the R among the figure ₃Represent the 4 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, comprises 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Represent the 1 road descending special pilot frequency, R ₁Represent the 2 road descending special pilot frequency, R ₂Represent the 3 road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, respectively the mapping of this 3 road descending special pilot frequency is handled being elaborated below.

The 1 road descending special pilot frequency R ₁:

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

Based on foregoing, the operation of carrying out the mapping processing of other descending special pilot frequencies except that 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, is mapped to A1+3=4 subcarrier at frequency domain;

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

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

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

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

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

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

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

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

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

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

The 2 road descending special pilot frequency R ₂:

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

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

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

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

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

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

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

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

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

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

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

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

The 3 road descending special pilot frequency R ₃:

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

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

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

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

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

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

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

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

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

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

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

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

Need to prove, when system only uses one road descending special pilot frequency, can adopt the pilot tone pattern of Fig. 1, when system uses two road descending special pilot frequencies in three road descending special pilot frequencies, can only send employed two road descending special pilot frequencies, the resource element that another road descending special pilot frequency takies still sends data, and for example, system uses the descending special pilot frequency R among Fig. 3 ₀And R ₁, R then ₂The resource element that takies 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, comprises 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Represent the 1 road descending special pilot frequency, R ₁Represent the 2 road descending special pilot frequency, R ₂Represent the 3 road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, respectively the mapping of this 3 road descending special pilot frequency is handled being elaborated below.

The 1 road descending special pilot frequency R ₀:

The 2 road descending special pilot frequency R ₁:

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

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

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

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

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

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

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

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

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

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

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

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

The 3 road descending special pilot frequency R ₂:

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

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

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

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

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

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

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

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

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

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

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

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

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, comprises 3 road descending special pilot frequency R ₀, R ₁And R ₂, wherein, R ₀Represent the 1 road descending special pilot frequency, R ₁Represent the 2 road descending special pilot frequency, R ₂Represent the 3 road descending special pilot frequency, and, include 12 descending special pilot frequencies in each road descending special pilot frequency, respectively the mapping of this 3 road descending special pilot frequency is handled being elaborated below.

The 1 road descending special pilot frequency R ₀:

The 2 road descending special pilot frequency R ₁:

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

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

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

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

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

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

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

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

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

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

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

The 3 road descending special pilot frequency R ₂:

The initial position of this road descending special pilot frequency at first is set, be specially: the position of first descending special pilot frequency of this road descending special pilot frequency is set to A3=3, D3=6 can be mapped to D3=6, individual, the D3+6=12 OFDM symbol of D3+3=9 with descending special pilot frequency in time domain respectively.

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

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

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

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

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

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

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

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

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

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

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

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, comprises 4 road descending special pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Represent the 1 road descending special pilot frequency, R ₁Represent the 2 road descending special pilot frequency, R ₂Represent the 3 road descending special pilot frequency, R ₃Represent the 4 road descending special pilot frequency, and, include 12 descending special pilot frequencies in the 1 road descending special pilot frequency and the 2 road descending special pilot frequency, include 6 descending special pilot frequencies in the 3 road descending special pilot frequency and the 4 road descending special pilot frequency, respectively the mapping of this 4 road descending special pilot frequency is handled being elaborated below.

The 1 road descending special pilot frequency R ₀:

The 2 road descending special pilot frequency R ₁:

The 3 road descending special pilot frequency R ₂:

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

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

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

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

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

The 4 road descending special pilot frequency R ₃:

The initial position of this road descending special pilot frequency at first is set, be specially: the position of first descending special pilot frequency of this road descending special pilot frequency is set to A4=6, D4=6 can be mapped to D4=6, individual, the D4+6=12 OFDM symbol of D4+3=9 with descending special pilot frequency in time domain respectively.

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

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

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

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

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

Need to prove, when system only uses one road descending special pilot frequency, can adopt the pilot tone pattern of Fig. 1; When system uses two road descending special pilot frequencies in three road descending special pilot frequencies, can only send employed two road descending special pilot frequencies, the resource element that another road descending special pilot frequency takies still sends data, and for example, system uses the descending special pilot frequency R among Fig. 3 ₀And R ₁, R then ₂The resource element that takies sends data; When system uses two road descending special pilot frequencies in four road descending special pilot frequencies, can only send employed two road descending special pilot frequencies, the resource element that other two road descending special pilot frequencies take still sends data, and for example, system uses the descending special pilot frequency R among Fig. 6 ₀And R ₁, R then ₂And R ₃The resource element that takies sends data; When system uses three road descending special pilot frequencies in four road descending special pilot frequencies, can only send employed three road descending special pilot frequencies, the resource element that other one road descending special pilot frequency takies still sends data, and for example, system uses the descending special pilot frequency R among Fig. 6 ₀, R ₁And R ₂, R then ₃The resource element that takies 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, comprises 4 road descending special pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Represent the 1 road descending special pilot frequency, R ₁Represent the 2 road descending special pilot frequency, R ₂Represent the 3 road descending special pilot frequency, R ₃Represent the 4 road descending special pilot frequency, and, and, include 6 descending special pilot frequencies in each road descending special pilot frequency, respectively the mapping of this 4 road descending special pilot frequency is handled being elaborated below.

The 1 road descending special pilot frequency R ₀:

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

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

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

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

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

The 2 road descending special pilot frequency R ₁:

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

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

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

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

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

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

The 3 road descending special pilot frequency R ₂:

The 4 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, comprises 4 road demodulation pilot frequency R ₀, R ₁, R ₂And R ₃, wherein, R ₀Represent the 1 road demodulation pilot frequency, R ₁Represent the 2 road demodulation pilot frequency, R ₂Represent the 3 road demodulation pilot frequency, R ₃Represent the 4 road demodulation pilot frequency, and, and, include 6 demodulation pilot frequencies in each road demodulation pilot frequency, respectively the mapping of this 4 road demodulation pilot frequency is handled being elaborated below.

The 1 road demodulation pilot frequency R ₀:

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

Based on foregoing, the operation of carrying out the mapping processing of other demodulation pilot frequencies except that 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, is mapped to A1+6=7 subcarrier at frequency domain;

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

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

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

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

The 2 road demodulation pilot frequency R ₁:

The initial position of this road demodulation pilot frequency at first is set, be specially: the position of first demodulation pilot frequency of this road demodulation pilot frequency is set to A2=4, D2=5 can be mapped to D2=5, individual, the D2+7=12 OFDM symbol of D2+4=9 with demodulation pilot frequency in time domain respectively.

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

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

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

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

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

Need to prove, when system only uses one road demodulation pilot frequency, can adopt the pilot tone pattern of Fig. 1; When system uses two road demodulation pilot frequencies in three road demodulation pilot frequencies, can only send employed two road demodulation pilot frequencies, the resource element that another road demodulation pilot frequency takies still sends data, and for example, system uses the demodulation pilot frequency R among Fig. 3 ₀And R ₁, R then ₂The resource element that takies sends data; When system uses two road demodulation pilot frequencies in four road demodulation pilot frequencies, can only send employed two road demodulation pilot frequencies, the resource element that other two road demodulation pilot frequencies take still sends data, and for example, system uses the demodulation pilot frequency R among Fig. 6 ₀And R ₁, R then ₂And R ₃The resource element that takies sends data; When system uses three road demodulation pilot frequencies in four road demodulation pilot frequencies, can only send employed three road demodulation pilot frequencies, the resource element that other one road demodulation pilot frequency takies still sends data, and for example, system uses the demodulation pilot frequency R among Fig. 6 ₀, R ₁And R ₂, R then ₃The resource element that takies sends data.

Device embodiment

According to the embodiment of the invention, a kind of demodulation pilot frequency mapping device is provided, the LTE system that can be used for this device adopts the frame structure of long loop prefix, 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, be used at long evolving system at least one road demodulation pilot frequency mapping of long loop prefix frame structure to Physical Resource Block, wherein, every 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 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 is used to be provided with the initial position group, wherein, comprises a plurality of initial positions in the described initial position group, and wherein, described initial position represents that with A and D A is a frequency domain initial position, and D is the time domain initial position;

Frequency domain interval set handling module 20 is used for being mapped to the demodulation pilot frequency of same time domain, and 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 the demodulation pilot frequency is set to 2 subcarriers;

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

Initial mapping processing module 40, this module can be connected to initial position set handling module 10, is used for each road demodulation pilot frequency, on the arbitrary initial position of its first demodulation pilot frequency mapping in the described initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality;

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, is used for the mapping processing that 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 carry out other demodulation pilot frequencies of every road demodulation pilot frequency except that described first demodulation pilot frequency.

In sum, handle by above-mentioned mapping of the present invention, the mapping of demodulation pilot frequency that not only can single channel, also help to adopt the demodulated reference signal of multi-channel demodulator pilot tone as cooperation cell, wherein, by the position of clear and definite frequency pilot sign in Physical Resource Block, when having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow in the existing LTE standard version; Secondly, the processing weights that comprise real channel information and wave beam formation by the channel information that the multi-channel demodulator pilot tone is obtained, many antenna weightings weights of each data flow when making each sub-district need not to feed back many antenna weightings weights of each sub-district or wave beam to form, thus avoided wave beam to form the feedback overhead of weights; In addition, dedicated pilot is more reasonable at the dedicated pilot mapping method that the design of the original position of time domain proposes than before, and under the situation of same pilot expense, performance is more excellent; And,, therefore guarantee the quality of channel estimating because each road dedicated pilot is very even in time domain and frequency domain distribution.

In addition, by technique scheme of the present invention, by the position of clear and definite frequency pilot sign in Physical Resource Block, the original position of dedicated pilot in time domain more reasonably is set, when having solved base station end employing multi-flow beam formation and multi-cell cooperating transmission, descending special pilot frequency can't obtain the problem of the channel information of a plurality of data flow in the existing LTE standard version, can realize higher systematic function under the situation of same pilot expense; And, the processing weights that comprise real channel information and wave beam formation by the channel information that the multi-channel demodulator pilot tone is obtained, many antenna weightings weights of each data flow when making each sub-district need not to feed back many antenna weightings weights of each sub-district or wave beam to form, thus the feedback overhead that wave beam forms weights eliminated; In addition, the present invention can also realize that the different dedicated pilot of a plurality of sub-districts employings carries out independent demodulation and each road dedicated pilot is evenly 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 the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

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

Claims

1. the mapping method of demodulation pilot frequency and Physical Resource Block, be used for the mapping of 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 is provided with the initial position group, wherein, comprises a plurality of initial positions in the described initial position group, and wherein, described initial position represents that with A and D A is a 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 the demodulation pilot frequency is set to 2 subcarriers;

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

Initial mapping processing, for each road demodulation pilot frequency, on the arbitrary initial position of its first demodulation pilot frequency mapping in the described initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality;

Carry out the mapping processing of other demodulation pilot frequencies except that 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.

2. method according to claim 1 is characterized in that, the initial position in the 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 2 is characterized in that, described pre-defined rule is:

On same time domain, shine upon 4 demodulation pilot frequencies;

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, perhaps, M=A-1, perhaps, M=A-4; It is identical with the frequency domain position of first demodulation pilot frequency of D OFDM symbol to be mapped to the frequency domain position of first demodulation pilot frequency of (D+6) individual OFDM symbol in time domain; Perhaps,

4. method according to claim 3 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 that described first demodulation pilot frequency in this road demodulation pilot frequency is handled and comprised:

5. method according to claim 3 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 that described first demodulation pilot frequency in this road demodulation pilot frequency is handled and comprised:

6. method according to claim 3 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 that described first demodulation pilot frequency in this road demodulation pilot frequency is handled and comprised:

7. the mapping device of demodulation pilot frequency and Physical Resource Block, be used for the mapping of 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 is used to be provided with the initial position group, wherein, comprises a plurality of initial positions in the described initial position group, and wherein, described initial position represents that with A and D A is a frequency domain initial position, and D is the time domain initial position;

Frequency domain interval set handling module is used for being mapped to the demodulation pilot frequency of same time domain, and 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 the demodulation pilot frequency is set to 2 subcarriers;

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

The initial mapping processing module is used for each road demodulation pilot frequency, and on the arbitrary initial position of its first demodulation pilot frequency mapping in the described initial position group, wherein, the initial position of each road demodulation pilot frequency is all inequality;

The mapping processing module is used for the mapping processing that 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 carry out other demodulation pilot frequencies of every road demodulation pilot frequency except that described first demodulation pilot frequency.