CN101540751B - Demodulating method for multi-stream data and system thereof - Google Patents
Demodulating method for multi-stream data and system thereof Download PDFInfo
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- CN101540751B CN101540751B CN 200910083091 CN200910083091A CN101540751B CN 101540751 B CN101540751 B CN 101540751B CN 200910083091 CN200910083091 CN 200910083091 CN 200910083091 A CN200910083091 A CN 200910083091A CN 101540751 B CN101540751 B CN 101540751B
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Abstract
The invention provides a demodulating method for multi-stream data and a system thereof. The demodulating method comprises the steps as follows: a pilot frequency symbol sequence is generated; for double-stream and four-stream data demodulation, two rows of pilot frequency symbols are equidistantly inserted in time domain correspondingly to each data stream in a pair of resource blocks; for eight-stream demodulation, one row of pilot frequency symbols are inserted in time domain while one pilot frequency symbol is inserted in every four sub-carrier-waves correspondingly to each data stream in a resource block, wherein, the pilot frequency and the data employ the same pre-coding mode; signals are sent to a receiver by an antenna; composite channel of resource particles, which is occupied by the pilot frequency, is estimated according to the inserted pilot frequency symbols when the signals are received by the receiver; the composite channel of resource particles, which is occupied by the data signals, is acquired by interpolation algorithm, thereby obtaining the data signals by demodulating. The special pilot frequency designed by the invention considers influence of factors, such as performance, spending and the like, thus having excellent compatibility with LTE Release 8.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to downlink data demodulation dedicated reference symbol (RS) design in the advanced Long Term Evolution (LTE-A) of universal mobile telecommunications system (UMTS), to realize demodulation method and the system of multi-stream data.
Background technology
In the LTE-A system, in order further to improve peak rate and the availability of frequency spectrum, determine to adopt higher antenna exponent number, such as descending 8 * 8 antennas.On the other hand, in order to improve the performance of Cell Edge User, cooperative multipoint transmission technology (CoMP) is brought in the framework of LTE-A by the 3rd generation partner program (3GPP).For effectively supporting the technology such as high-order mimo (multiple-input, multiple-output) and CoMP, increase new RS and become a kind of common recognition.
In the 56th meeting of 3GPP TSG RAN WG1, determined that introducing comes demodulation PDSCH (Physical Downlink Shared Channel) with the Demodulation-RS (demodulation pilot frequency) of the identical pre-coding scheme of the data.Adopt the dedicated pilot through coding, can make the UE end need not to know the MIMO scheme of making a start, demodulate pellucidly data, can reduce signalling, simplify the operation of receiving terminal.Demod-RS only transmits in the Resource Block of scheduling and corresponding data flow, is mapped between the Demod-RS of different data streams to keep quadrature.The defined dedicated pilot of single current in 3GPP LTE Release 8.One group of dedicated pilot that is used for the transmission of support multi-stream data of design has become a kind of exigence in LTE-A.
Different Demod-RS patterns and RS multiplex mode (such as FDM/TDM/CDM) all can exert an influence to the precision of channel estimating and the performance of system.The design of LTE-A Demod-RS need to consider the compromise of expense and performance and with the factors such as backwards compatibility of LTE R8.When pilot density increased, the performance of channel estimating can promote to some extent, but pilot-frequency expense also can increase simultaneously.Therefore, consider each factor to the impact of systematic function, the pilot tone that designs one group of optimization is one of hot issue of paying close attention at present.
Summary of the invention
The present invention propose to be used for demodulation method and the system of multi-stream data, and pilot-frequency expense is less, can satisfy under the typical environment needs to the multi-stream data demodulation, and has good compatibility with LTE R8.
According to an aspect of the present invention, propose to be used for the demodulation method of multi-stream data, comprising: generate sequence of pilot symbols; In each data flow, on the time domain, for double fluid/four flow data demodulation methods, equidistantly insert 2 row frequency pilot signs in each subframe, for eight flow data demodulation methods, equidistantly insert 1 row frequency pilot sign in each subframe, every row pilot tone is inserted 1 frequency pilot sign, the precoding mode that frequency pilot sign is identical with the data every 4 subcarriers on frequency domain; I group antenna transmitted signal W
ix
i, described x
iFor inserting the data-signal of described frequency pilot sign, described W
iIt is the pre-coding matrix of i group antenna; When described recipient j root antenna reception to signal y
j=H
JiW
ix
i+ n
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the described frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of described data-signal by interpolation arithmetic, demodulate data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna, described n
jIt is the noise on the j root antenna.
According to another aspect of the present invention, also propose to be used for the demodulating system of multi-stream data, comprising: generation module is used for generating sequence of pilot symbols; Insert module, be used in each data flow, on the time domain, for double fluid/four flow data demodulating systems, equidistantly insert 2 row frequency pilot signs in each subframe, for eight flow data demodulating systems, equidistantly insert 1 row frequency pilot sign in each subframe, every row pilot tone is inserted 1 frequency pilot sign every 4 subcarriers on frequency domain, described pilot tone adopts and adopts identical precoding mode with data-signal; Sending module is used for by antenna sets i to recipient's transmitted signal W
ix
i, wherein, described x
iFor inserting the data-signal of described frequency pilot sign, described W
iIt is the pre-coding matrix of i group antenna; Demodulation module is used for receiving signal y as described recipient
j=H
JiW
ix
i+ n
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of described data-signal by interpolation arithmetic, demodulate described data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna, described n
jIt is the noise on the j root antenna.
Compared with prior art, the present invention has the following advantages at least:
Internal at a Resource Block, on the time domain for the double fluid and four Stream Data Transmissions, same position at two time slots of each subframe is inserted 2 row frequency pilot signs, for eight Stream Data Transmissions, insert 1 row frequency pilot sign in the same position of each subframe, in can user's demodulation needs that low speed moves in satisfying, keep a lower resource overhead.Every row pilot tone is inserted 1 frequency pilot sign every 4 subcarriers on frequency domain, also be the factor that has considered demodulation performance and pilot-frequency expense, and has kept compatibility with design among the existing LTE.
Reach quadrature by frequency division multiplexing between the different pieces of information layer, with the time become and frequency-selective channel in show more excellent performance.
Description of drawings
With reference to the accompanying drawings and in conjunction with example demodulation dedicated pilot of the present invention (Demod-RS) design method of pattern is described.
Fig. 1 has illustrated a kind of application scenarios of high-order mimo multi-flow beam forming.
Fig. 2 has illustrated the application scenarios of a kind of CoMP.
Fig. 3 is the demodulation method flow chart that is used for multi-stream data among the present invention.
Matrix structure among Fig. 4 to Fig. 9 represents that a Resource Block in the ofdm system is to (RBpair), wherein laterally represent 1 subframe of time domain (14 OFDM symbols of conventional CP, 12 OFDM symbols of expansion CP), vertically represent 12 continuous subcarriers of frequency domain; Each lattice represents a resource particle.Represent respectively dedicated pilot for demodulation n layer (n=1,2 or n=1,2,3,4 or n=1,2,3,4,5,6,7,8) data with the icon of shade among each figure.
Fig. 4 has illustrated that the double-current demodulation dedicated pilot of the present invention's routine CP layout, dedicated pilot density corresponding to each data flow are 6 pilot tones of a RB pair insertion.
Fig. 5 has illustrated the present invention to expand CP double fluid demodulation dedicated pilot layout, and dedicated pilot density corresponding to each data flow is that a RB pair inserts 6 pilot tones.
Fig. 6 has illustrated the conventional CP four of the present invention to flow demodulation dedicated pilot layouts, and dedicated pilot density corresponding to each data flow is that a RB pair inserts 6 pilot tones.
Fig. 7 has illustrated the present invention to expand CP four stream demodulation dedicated pilot layouts, and dedicated pilot density corresponding to each data flow is that a RB pair inserts 6 pilot tones.
Fig. 8 has illustrated the conventional CP eight of the present invention to flow demodulation dedicated pilot layouts, and dedicated pilot density corresponding to each data flow is that a RB pair inserts 3 pilot tones.
Fig. 9 has illustrated the present invention to expand CP eight stream demodulation dedicated pilot layouts, and dedicated pilot density corresponding to each data flow is that a RB pair inserts 3 pilot tones.
Figure 10 is the demodulating system structure chart that is used for multi-stream data among the present invention.
Embodiment
The invention discloses a kind of for conventional CP and expansion CP structure, be used for the dedicated pilot layout of demodulation double fluid/four streams/eight stream data channel, relate to advanced 3GPP Long Term Evolution LTE-A system, be mainly used in the data demodulates of high-order antenna and cooperative multipoint transmission etc.The double fluid of the present invention's design and four stream dedicated pilot density are: a resource block pair, correspond to every layer data, insert equably 2 row frequency pilot signs on the time domain, insert equably 3 frequency pilot signs on every row pilot tone frequency domain, two row frequency pilot signs are staggeredly placed at frequency domain.Eight stream dedicated pilot density of the present invention's design are: a resource block pair, correspond to every layer data, insert 1 row frequency pilot sign in the same position of each subframe on the time domain, insert equably 3 frequency pilot signs on every row pilot tone frequency domain.Each antenna that is used for the transmission identical data inserts the dedicated pilot with identical sequence and mapping pattern, and dedicated pilot adopts the precoding mode identical with data, and receiving terminal can demodulate user data pellucidly like this.Reach quadrature by frequency division multiplexing between the different pieces of information layer, with the time become and frequency-selective channel in show more excellent performance.The dedicated pilot of the present invention's design has considered the impact of the factors such as performance and expense, has good compatibility with LTE Release8.
Fig. 3 is the demodulation method flow chart that is used for multi-stream data among the present invention, may further comprise the steps:
In step 301, generate sequence of pilot symbols.
The pseudo random sequence among the LTE R8 is continued to use in the generation of pilot frequency sequence, and in the service scenarios of single residential quarter, the initial value of described sequence of pilot symbols is decided by residential quarter ID, current time slots number and user's the interim ID of wireless network; In cooperative multipoint transmission framework CoMP, the initial value of described sequence of pilot symbols is decided by that residential quarter ID, timeslot number and the main plot of main plot are the interim ID of wireless network of user assignment, and described main plot is the best residential quarter of signal quality in the cooperation.
In step 302, for double fluid and four flow data demodulation, in a Resource Block, correspond to each data flow, equidistantly insert 2 row frequency pilot signs on the time domain; For eight flow data demodulation, in a Resource Block, correspond to each data flow, insert 1 row frequency pilot sign on the time domain.On the frequency domain, insert 1 frequency pilot sign, the precoding mode that pilot tone is identical with the data every 4 subcarriers.
On time domain, for double fluid and four stream Demod-RS, the same position of 2 row pilot symbol distribution, two time slots in a subframe, for eight stream Demod-RS, 1 row pilot symbol distribution is in the same position of each subframe; On frequency domain, 3 frequency pilot signs equidistantly insert in 12 continuous subcarriers.If insert 2 row pilot tones on the time domain, then 2 row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.Frequency pilot sign distributes on whole resource equably.For double fluid and four flow data demodulation, equidistantly insert 2 row frequency pilot signs on the time domain in each subframe, can user's demodulation needs that low speed moves in satisfied in, keep a lower resource overhead.Eight Stream Data Transmissions are mainly used in the user than low-speed motion, so each subframe is inserted the performance that 1 row pilot tone can guarantee data demodulates on the time domain, and expense reduces simultaneously.Similarly, every row pilot tone is inserted 1 frequency pilot sign every 4 subcarriers on frequency domain, also be the factor that has considered demodulation performance and pilot-frequency expense, and has kept compatibility with design among the existing LTE.
Each frequency pilot sign is mapped to the resource particle RE (i.e. 1 subcarrier * 1 OFDM symbol) in the ofdm system, is no longer carried other physical channel or physical signalling by the resource particle that frequency pilot sign takies.Demod-RS evenly distributes in Resource Block, and does not clash with the mapping position of CRS (public guide frequency) among PDCCH (Physical Downlink Control Channel), the LTE R8.
Continued to use frequency domain displacement (shifting) technology of LTE Release 8, the frequency domain displacement refers to that pilot tone takies different resource particle at frequency domain for different residential quarter ID, and in the service scenarios of single residential quarter, the shifting value is determined by residential quarter ID.Under the cooperative multipoint transmission framework, the demodulation dedicated pilot frequency domain shifting value of all cooperation cell is all consistent with the main plot.
Demod-RS layout provided by the invention is mainly used in double fluid, four streams and eight data channel demodulation that flow.Be elaborated for the frequency pilot sign that in different multi-stream datas, inserts below in conjunction with accompanying drawing.
If the data of downlink transfer are two-layer, then in each PRB, insert pilot tone by double-current Demod-RS pattern, referring to Fig. 4 and Fig. 5.For double-current demodulation dedicated pilot, the second frequency pilot sign of second data flow of demodulation is with respect to the first frequency pilot sign of first data flow of demodulation, the position is identical on frequency domain, and the displacement of two OFDM symbols is arranged for conventional CP on time domain, and the displacement of an OFDM symbol is arranged for expansion CP.
On the time domain, the corresponding Demod-RS of every layer data can be divided into two row each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data lays respectively in the 4th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data lays respectively in the 5th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.
On the frequency domain, equidistantly insert 3 pilot tones in per 12 continuous subcarriers, two row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.For reducing the interference between the neighbor cell (or cell set), the pilot design scheme is continued to use the existing frequency domain shifting of LTE R8 technology, and the shifting value is determined by residential quarter ID.Under the CoMP framework, clash for avoiding data and pilot tone, stipulate that the Demod-RS frequency domain shifting value of all residential quarters is all consistent with the main plot.
If the data of downlink transfer are four layers, then in each PRB, insert pilot tone by four stream Demod-RS patterns, referring to Fig. 6 and Fig. 7.For four stream demodulation dedicated pilots, described the first frequency pilot sign, the second frequency pilot sign are identical with double-current demodulation dedicated pilot, the 3rd frequency pilot sign, the 4th frequency pilot sign are with respect to described the first frequency pilot sign, the second frequency pilot sign, the displacement of two subcarriers is arranged at frequency domain respectively, and the position is identical on time domain.
On the time domain, the corresponding Demod-RS of every layer data can be divided into two row each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 4th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 5th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.
On the frequency domain, identical with double-current Demod-RS design, equidistantly insert 3 pilot tones in per 12 continuous subcarriers, two row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.Similarly, for reducing the interference between the neighbor cell (or cell set), continued to use the existing frequency domain shifting of LTE R8 technology.In addition, in the same OFDM symbol, between adjacent two Demod-RS that are used for demodulation ground floor data and the 3rd layer data, be used for having between the Demod-RS of demodulation second layer data and the 4th layer data the interval of two subcarriers.
If the data of downlink transfer are eight layers, then in each PRB, insert pilot tone by eight stream Demod-RS patterns, referring to Fig. 8 and Fig. 9.Because eight Stream Data Transmissions are mainly used in the user that moves than low speed, therefore eight stream Demod-RS relatively double fluid and four flow Demod-RS and have less time gap density, namely each subframe is inserted 1 row frequency pilot sign.
On the time domain, the corresponding Demod-RS of every layer data all inserts 1 row pilot tone each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 4th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation layer 5 data and layer 7 data lays respectively in the 4th the OFDM symbol of each odd number time slot; The Demod-RS that is used for demodulation layer 6 data and the 8th layer data lays respectively in the 6th the OFDM symbol of each odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 5th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation layer 5 data and layer 7 data lays respectively in the 5th the OFDM symbol of each odd number time slot; The Demod-RS that is used for demodulation layer 6 data and the 8th layer data lays respectively in the 6th the OFDM symbol of each odd number time slot.
On the frequency domain, identical with four stream Demod-RS designs with double fluid, equidistantly insert 3 pilot tones in per 12 continuous subcarriers.Similarly, for reducing the interference between the neighbor cell (or cell set), continued to use the existing frequency domain shifting of LTE R8 technology.Wherein, but the frequency domain shifting value of above-mentioned Demod-RS be
(
Expression residential quarter ID).
In step 303, by antenna sets i transmitted signal W
ix
i, described x
iFor inserting the data-signal of described frequency pilot sign, described W
iIt is the pre-coding matrix of i group antenna.
Reach quadrature by frequency division multiplexing (FDM) between the different pieces of information layer, that is to say, the resource particle that transmits the demodulation dedicated pilot symbol at an antenna port is not used in the transfer of data of this antenna port, and should be set to 0 in other antenna port.When a plurality of antenna elements of same or different districts sent identical data, each antenna element should insert the Demod-RS of identical sequence, density and pattern, and Demod-RS adopts the MIMO precoding mode identical with data.
In step 304, when described recipient receives described signal y
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of data-signal by interpolation arithmetic, demodulate described data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna.
The demodulation dedicated pilot does not take front 3 OFDM symbols of each subframe, physical downlink control channel PDCCH is impacted avoiding; The demodulation dedicated pilot does not take the first two and third from the bottom OFDM symbol of each time slot, conflicts to avoid producing with the public guide frequency CRS of LTE Release8.
The present invention proposes a kind of simply, be used for the Demod-RS method for designing of demodulation double fluid/four streams/eight stream data channel.The pilot-frequency expense of the method design is less, can satisfy the needs of data demodulates under the typical environment, and has good compatibility with LTE R8.
Below in conjunction with drawings and Examples demodulation method of the present invention is elaborated.
As shown in Figure 1, eNodeB be that UE1 and UE2 serve by the wave beam forming of double fluid simultaneously, and two data Layers divide by sky and reach multiplexing.In order to allow two UE estimate independently of one another the channel response matrix of making a start with it, need the dedicated pilot of definition two cover quadratures, shown in Fig. 4 (conventional CP) and Fig. 5 (expansion CP).
Suppose that eNodeB has disposed n root physical antenna and carried out dual-stream beamforming, wherein the 1st group of antenna (n
1Root) is UE1 service, the 2nd group of antenna (n
2Root) is UE2 service (n
1+ n
2〉=n); UE1 and UE2 respectively join 1 reception antenna.ENodeB inserts the first dedicated pilot of identical patterns sequence, identical precoding mode with the data in the PRB (Physical Resource Block) that the 1st group of antenna sends, RE corresponding to the second dedicated pilot sets to 0 simultaneously; Similarly, in the PRB that the 2nd group of antenna sends, insert the second dedicated pilot of identical patterns sequence, identical precoding mode with the data, the RE that the first dedicated pilot is corresponding sets to 0.If being the data that UE1, UE2 send, eNodeB is respectively x
1And x
2, the wave beam forming weight vector of i group antenna is respectively:
Channel response matrix between eNodeB and the user j is respectively:
Like this, the signal that receives of user j is:
y
ji＝H
jiW
ix
i+n
j(i＝1，2；j＝1，2)
Utilize the designed double-current quadrature Demod-RS of the present invention, UE1 and UE2 need not to know the precoding mode of making a start, and direct estimation goes out composite channel separately
Thereby demodulate pellucidly data-signal x
1And x
2
Above-mentioned example only is a kind of application scenarios of the present invention, the protection range that is not intended to limit the present invention.
Fig. 8 is the demodulating system structure chart that is used for multi-stream data among the present invention, comprising: generation module, insert module, sending module and demodulation module.
Generation module is used for generating sequence of pilot symbols;
Insert module is for double fluid and four flow data demodulation, in a Resource Block, correspond to each data flow, equidistantly insert 2 row frequency pilot signs on the time domain, for eight flow data demodulation, in a Resource Block, correspond to each data flow, insert 1 row frequency pilot sign on the time domain; On the frequency domain, insert 1 frequency pilot sign every 4 subcarriers; The precoding mode that pilot tone is identical with the data;
Sending module is by antenna sets i transmitted signal W
ix
i, described x
iFor inserting the data-signal of described frequency pilot sign, described W
iIt is the pre-coding matrix of i group antenna;
Demodulation module is used for receiving described signal y as described recipient
j=H
JiW
ix
i+ n
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of described data-signal by interpolation arithmetic, demodulate described data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna, described n
jIt is the noise on the j root antenna.
Wherein, the pseudo random sequence among the LTE R8 is continued to use in the generation of pilot frequency sequence in the generation module, and in the service scenarios of single residential quarter, the initial value of described sequence of pilot symbols is decided by residential quarter ID, current time slots number and user's the interim ID of wireless network; In cooperative multipoint transmission framework CoMP, the initial value of described sequence of pilot symbols is decided by that residential quarter ID, timeslot number and the main plot of main plot are the interim ID of wireless network of user assignment, and described main plot is the best residential quarter of signal quality in the cooperation.
Insert module flows Demod-RS for double fluid and four when inserting frequency pilot sign, the same position of 2 row pilot symbol distribution, two time slots in a subframe, and for eight stream Demod-RS, 1 row pilot symbol distribution is in the same position of each subframe; On frequency domain, 3 frequency pilot signs equidistantly insert in 12 continuous subcarriers.If insert 2 row pilot tones on the time domain, then 2 row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.Frequency pilot sign distributes on whole resource equably.For double fluid and four flow data demodulation, equidistantly insert 2 row frequency pilot signs on the time domain in each subframe, can user's demodulation needs that low speed moves in satisfied in, keep a lower resource overhead.Eight Stream Data Transmissions are mainly used in the user than low-speed motion, so each subframe is inserted the performance that 1 row pilot tone can guarantee data demodulates on the time domain, and expense reduces simultaneously.Similarly, every row pilot tone is inserted 1 frequency pilot sign every 4 subcarriers on frequency domain, also be the factor that has considered demodulation performance and pilot-frequency expense, and has kept compatibility with design among the existing LTE.Each frequency pilot sign is mapped to the resource particle RE (i.e. 1 subcarrier * 1 OFDM symbol) in the ofdm system, is no longer carried other physical channel or physical signalling by the resource particle that frequency pilot sign takies.Demod-RS evenly distributes in Resource Block, and does not clash with the mapping position of CRS (public guide frequency) among PDCCH (Physical Downlink Control Channel), the LTE R8.
Continued to use frequency domain displacement (shifting) technology of LTE Release 8, the frequency domain displacement refers to that pilot tone takies different resource particle at frequency domain for different residential quarter ID, and the shifting value is determined by residential quarter ID.Under the cooperative multipoint transmission framework, the demodulation dedicated pilot frequency domain shifting value of all cooperation cell is all consistent with the main plot.
Demod-RS layout provided by the invention is mainly used in double fluid, four streams and eight data channel demodulation that flow.Be elaborated for the frequency pilot sign that in different multi-stream datas, inserts below in conjunction with accompanying drawing.
If the data of downlink transfer are two-layer, then in each PRB, insert pilot tone by double-current Demod-RS pattern, referring to Fig. 4 and Fig. 5.For double-current demodulation dedicated pilot, the second frequency pilot sign of second data flow of demodulation is with respect to the first frequency pilot sign of first data flow of demodulation, the position is identical on frequency domain, and the displacement of two OFDM symbols is arranged for conventional CP on time domain, and the displacement of an OFDM symbol is arranged for expansion CP.
On the time domain, the corresponding Demod-RS of every layer data can be divided into two row each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data lays respectively in the 4th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data lays respectively in the 5th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.
On the frequency domain, equidistantly insert 3 pilot tones in per 12 continuous subcarriers, two row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.For reducing the interference between the neighbor cell (or cell set), the pilot design scheme is continued to use the existing frequency domain shifting of LTE R8 technology, and the shifting value is determined by residential quarter ID.Under the CoMP framework, clash for avoiding data and pilot tone, stipulate that the Demod-RS frequency domain shifting value of all residential quarters is all consistent with the main plot.
If the data of downlink transfer are four layers, then in each PRB, insert pilot tone by four stream Demod-RS patterns, referring to Fig. 6 and Fig. 7.For four stream demodulation dedicated pilots, described the first frequency pilot sign, the second frequency pilot sign are identical with double-current demodulation dedicated pilot, the 3rd frequency pilot sign, the 4th frequency pilot sign are with respect to described the first frequency pilot sign, the second frequency pilot sign, the displacement of two subcarriers is arranged at frequency domain respectively, and the position is identical on time domain.
On the time domain, the corresponding Demod-RS of every layer data can be divided into two row each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 4th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 5th the OFDM symbol of each even number or odd number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number or odd number time slot.
On the frequency domain, identical with double-current Demod-RS design, equidistantly insert 3 pilot tones in per 12 continuous subcarriers, two row frequency pilot signs are staggeredly placed at frequency domain, are spaced apart two subcarriers.Similarly, for reducing the interference between the neighbor cell (or cell set), continued to use the existing frequency domain shifting of LTE R8 technology.In addition, in the same OFDM symbol, between adjacent two Demod-RS that are used for demodulation ground floor data and the 3rd layer data, be used for having between the Demod-RS of demodulation second layer data and the 4th layer data the interval of two subcarriers.
If the data of downlink transfer are eight layers, then in each PRB, insert pilot tone by eight stream Demod-RS patterns, referring to Fig. 8 and Fig. 9.Because eight Stream Data Transmissions are mainly used in the user that moves than low speed, therefore eight stream Demod-RS relatively double fluid and four flow Demod-RS and have less time gap density, namely each subframe is inserted 1 row frequency pilot sign.
On the time domain, the corresponding Demod-RS of every layer data all inserts 1 row pilot tone each RB centering.For conventional CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 4th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation layer 5 data and layer 7 data lays respectively in the 4th the OFDM symbol of each odd number time slot; The Demod-RS that is used for demodulation layer 6 data and the 8th layer data lays respectively in the 6th the OFDM symbol of each odd number time slot.For expansion CP, the Demod-RS that is used for demodulation ground floor data and the 3rd layer data lays respectively in the 5th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation second layer data and the 4th layer data lays respectively in the 6th the OFDM symbol of each even number time slot; The Demod-RS that is used for demodulation layer 5 data and layer 7 data lays respectively in the 5th the OFDM symbol of each odd number time slot; The Demod-RS that is used for demodulation layer 6 data and the 8th layer data lays respectively in the 6th the OFDM symbol of each odd number time slot.
On the frequency domain, identical with four stream Demod-RS designs with double fluid, equidistantly insert 3 pilot tones in per 12 continuous subcarriers.Similarly, for reducing the interference between the neighbor cell (or cell set), continued to use the existing frequency domain shifting of LTE R8 technology.Wherein, but the frequency domain shifting value of above-mentioned Demod-RS be
(
Expression residential quarter ID).
During the sending module transmitted signal, reach quadrature by frequency division multiplexing (FDM) between the different pieces of information layer, that is to say that the resource particle that transmits the demodulation dedicated pilot symbol at an antenna port is not used in the transfer of data of this antenna port, and should be set to 0 in other antenna port.When a plurality of antenna elements of same or different districts sent identical data, each antenna element should insert the Demod-RS of identical sequence, density and pattern, and Demod-RS adopts the MIMO precoding mode identical with data.
Demodulation module demodulation dedicated pilot does not take front 3 OFDM symbols of each subframe, physical downlink control channel PDCCH is impacted avoiding; The demodulation dedicated pilot does not take the first two and third from the bottom OFDM symbol of each time slot, conflicts to avoid producing with the public guide frequency CRS of LTE Release8.
The invention provides one group of demodulation method and system that is used for multithread (double fluid, four streams and eight streams) data, designed in the method special-purpose demodulation pilot frequency pattern, the frequency domain density of this pilot frequency design can satisfy the signal demodulation needs under the typical frequencies selectivity fading environment.Simultaneously, because the user that multi-stream data transmission main services moves in middle low speed, the time domain density of this pilot frequency design also can satisfy the demodulation demand.
Will be understood that in one embodiment, the method step of discussing is to be carried out by (one or more) suitable processor that execution is stored in processing (the being computer) system of the instruction (code segment) in the storage device.Also will understand, the present invention is not limited to any specific implementation or programming technique, and the present invention can realize that the technology of function as described herein realizes with any suitable being used for.The present invention is not limited to any specific programming language or operating system.Thereby as what one skilled in the art will appreciate that, embodiments of the invention can be implemented as method, such as the such device of isolated plant, such as the such device of data handling system, perhaps bearing medium, for example computer program.The bearing medium carrying is used for one or more computer-readable code sections of control treatment system implementation method.Therefore, aspect of the present invention can be taked method, pure hardware implementation example, pure software embodiment or combine the form of the embodiment of software and hardware aspect.In addition, the present invention can take to carry the form of the bearing medium (for example computer program on the computer-readable recording medium) of the computer readable program code section that is included in the medium.Can use any suitable computer-readable medium, comprising such as disk or the such magnetic storage apparatus of hard disk, perhaps such as the such optical storage media of CD-ROM.
As the conclusion to describing in detail, should notice that those skilled in the art will be apparent to make many variations and modification to preferred embodiment, and not break away from fact principle of the present invention.This variation and modification are included within the described scope of the present invention of appended claims.
Claims (10)
1. be used for the demodulation method of multi-stream data, may further comprise the steps:
Generate sequence of pilot symbols;
For double fluid and four flow data demodulation, in a Resource Block, correspond to each data flow, equidistantly insert 2 row frequency pilot signs on the time domain, for eight flow data demodulation, in a Resource Block, correspond to each data flow, insert 1 row frequency pilot sign on the time domain; On the frequency domain, insert 1 frequency pilot sign, the precoding mode that pilot tone is identical with the data every 4 subcarriers;
By antenna sets i to recipient's transmitted signal W
ix
i, wherein, described W
iBe the pre-coding matrix of i group antenna, described x
iFor inserting the data-signal of described frequency pilot sign;
When described recipient receives signal y
j=H
JiW
ix
i+ n
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of described data-signal by interpolation arithmetic, demodulate described data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna, described n
jIt is the noise on the j root antenna.
2. demodulation method according to claim 1 generates the operation of sequence of pilot symbols, it is characterized in that: in the service scenarios of single residential quarter, the initial value of described sequence of pilot symbols is decided by residential quarter ID, current time slots number and user's the interim ID of wireless network; In the cooperative multipoint transmission framework, the initial value of described sequence of pilot symbols is decided by that residential quarter ID, timeslot number and the main plot of main plot are the interim ID of wireless network of user assignment, and described main plot is the best residential quarter of signal quality in the cooperation.
3. demodulation method according to claim 1, for double fluid and four flow data demodulation, equidistantly insert 2 row frequency pilot signs on the time domain in each subframe, for eight flow data demodulation, insert the operation of 1 row frequency pilot sign on the time domain in each subframe, it is characterized in that: for double fluid and four flow data demodulation, the same position of described 2 row pilot symbol distribution two time slots in a subframe; For eight flow data demodulation, described 1 row pilot symbol distribution is in the same position of each subframe.
4. demodulation method according to claim 1, the operation of inserting frequency pilot sign is characterized in that: frequency domain displacement technology is adopted in the insertion of described frequency pilot sign, and in the service scenarios of single residential quarter, shift value is determined by residential quarter ID; Under the cooperative multipoint transmission framework, the demodulation dedicated pilot frequency domain shift value of all cooperation cell is consistent with the main plot.
5. according to claim 1 or 4 described demodulation methods, insert the operation of frequency pilot sign, it is characterized in that:
For double-current demodulation dedicated pilot, the second frequency pilot sign of second data flow of demodulation is with respect to the first frequency pilot sign of first data flow of demodulation, the position is identical on frequency domain, and the displacement of two OFDM symbols is arranged for conventional CP on time domain, and the displacement of an OFDM symbol is arranged for expansion CP;
For four stream demodulation dedicated pilots, described the first frequency pilot sign, the second frequency pilot sign are identical with double-current demodulation dedicated pilot, the 3rd frequency pilot sign, the 4th frequency pilot sign are with respect to described the first frequency pilot sign, the second frequency pilot sign, the displacement of two subcarriers is arranged at frequency domain respectively, and the position is identical on time domain;
For eight stream demodulation dedicated pilots, first to fourth frequency pilot sign is inserted into the even number time slot, identical with described four positions of stream demodulation dedicated pilot in the even number time slot respectively, the the 5th to the 8th frequency pilot sign is inserted into the odd number time slot, and is identical with described four positions of stream demodulation dedicated pilot in the odd number time slot respectively.
6. demodulation method according to claim 1, by the operation of antenna sets i to recipient's transmitted signal, it is characterized in that: the resource particle that transmits the demodulation dedicated pilot symbol at an antenna port is not used in the transfer of data of this antenna port, and should be set to 0 in other antenna port.
7. demodulation method according to claim 1 demodulates the operation of described data-signal, it is characterized in that: the demodulation dedicated pilot does not take front 3 OFDM symbols of each subframe, the first two that does not take each time slot and the 3rd OFDM symbol reciprocal.
8. be used for the demodulating system of multi-stream data, comprise:
Generation module is used for generating sequence of pilot symbols;
Insert module is used in each data flow, for double fluid and four flow data demodulating systems, equidistantly inserts 2 row frequency pilot signs on the time domain in each subframe, for eight flow data demodulating systems, inserts 1 row frequency pilot sign on the time domain in each subframe; And on frequency domain, inserting 1 frequency pilot sign every 4 subcarriers, frequency pilot sign adopts the precoding mode identical with data;
Sending module is used for by antenna sets i to recipient's transmitted signal W
ix
i, wherein, described W
iBe the pre-coding matrix of i group antenna, described x
iFor inserting the data-signal of described frequency pilot sign;
Demodulation module is used for receiving signal y as described recipient
j=H
JiW
ix
i+ n
jThe time, estimate the composite channel H of the shared resource particle of pilot tone according to the frequency pilot sign that inserts
JiW
i, obtain the composite channel of the shared resource particle of described data-signal by interpolation arithmetic, demodulate described data-signal x
i, described H
JiBe that i group transmitting antenna is to the channel response of j root antenna, described n
jIt is the noise on the j root antenna.
9. demodulating system according to claim 8, it is characterized in that: for double fluid and four stream demodulation dedicated pilots, described insert module is inserted into described 2 row frequency pilot signs the same position of two time slots in the subframe, for eight stream demodulation dedicated pilots, described insert module is inserted into described 1 row frequency pilot sign the same position of each subframe.
10. according to claim 8 or 9 described demodulating systems, it is characterized in that: described insert module is inserted the frequency pilot sign that adopts frequency domain displacement technology, for double-current demodulation dedicated pilot, the second frequency pilot sign of second data flow of demodulation is with respect to the first frequency pilot sign of first data flow of demodulation, the position is identical on frequency domain, the displacement of two OFDM symbols is arranged for conventional CP on time domain, the displacement of an OFDM symbol is arranged for expansion CP;
For four stream demodulation dedicated pilots, described the first frequency pilot sign, the second frequency pilot sign are identical with double-current demodulation dedicated pilot, the 3rd frequency pilot sign, the 4th frequency pilot sign are with respect to described the first frequency pilot sign, the second frequency pilot sign, the displacement of two subcarriers is arranged at frequency domain respectively, and the position is identical on time domain;
For eight stream demodulation dedicated pilots, first to fourth frequency pilot sign is inserted into the even number time slot, identical with described four positions of stream demodulation dedicated pilot in the even number time slot respectively, the the 5th to the 8th frequency pilot sign is inserted into the odd number time slot, and is identical with described four positions of stream demodulation dedicated pilot in the odd number time slot respectively.
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| CN102014527B (en) * | 2009-09-29 | 2014-04-16 | 电信科学技术研究院 | Sending method and channel demodulation method, system and device of demodulation pilot frequency on return link |
| CN102055517A (en) * | 2009-11-02 | 2011-05-11 | 中兴通讯股份有限公司 | Mapping method of reference signal and base station adopted in mapping method |
| CN102056316B (en) * | 2009-11-02 | 2013-06-26 | 电信科学技术研究院 | Channel resource allocation method, base station and relay node |
| KR101757452B1 (en) | 2010-01-08 | 2017-07-13 | 삼성전자주식회사 | A method for mapping and demapping resource in a wireless communication system and an apparatus thereof |
| CN102255840B (en) * | 2010-05-20 | 2014-10-22 | 中兴通讯股份有限公司 | Demodulation method and device |
| CN101867533B (en) | 2010-05-27 | 2012-10-24 | 东南大学 | Method for estimating pilot frequency and communication channel of space division multiple access (SDMA) multi-antenna transmission down link |
| MX368299B (en) | 2011-02-18 | 2019-09-27 | Sun Patent Trust | Method of signal generation and signal generating device. |
| CN103312396B (en) * | 2012-03-15 | 2018-05-11 | 中兴通讯股份有限公司 | The method of MIMO precodings and base station |
| CN103916210B (en) * | 2013-01-04 | 2017-09-12 | 中国移动通信集团公司 | A kind of data processing method, system and device for cooperative multicast system |
| CN103401592B (en) * | 2013-07-30 | 2016-12-28 | 清华大学 | Coordinated multi-point transmission method based on LTE R8 special pilot frequency for user and system |
| WO2015165016A1 (en) | 2014-04-28 | 2015-11-05 | 华为技术有限公司 | Mbsfn configuration method and device |
| CN107852710B (en) * | 2015-11-06 | 2020-07-21 | 华为技术有限公司 | Data transmission method, network equipment and terminal equipment |
| CN107733596B (en) * | 2016-08-11 | 2020-02-14 | 华为技术有限公司 | Information transmission method and equipment |
| CN108737052B (en) * | 2017-04-25 | 2020-08-28 | 大唐移动通信设备有限公司 | Pilot frequency sending and receiving method and device |
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| CN1852069A (en) * | 2005-10-10 | 2006-10-25 | 华为技术有限公司 | Method for realizing pilot frequency in wireless communication system |
| CN1921363A (en) * | 2005-08-27 | 2007-02-28 | 华为技术有限公司 | Method and system for creating time-frequency two-dimensional pilot pattern |
| CN101223720A (en) * | 2005-06-14 | 2008-07-16 | 株式会社Ntt都科摩 | Transmitting apparatus, transmitting method, receiving apparatus, and receiving method |
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| CN101223720A (en) * | 2005-06-14 | 2008-07-16 | 株式会社Ntt都科摩 | Transmitting apparatus, transmitting method, receiving apparatus, and receiving method |
| CN1921363A (en) * | 2005-08-27 | 2007-02-28 | 华为技术有限公司 | Method and system for creating time-frequency two-dimensional pilot pattern |
| CN1852069A (en) * | 2005-10-10 | 2006-10-25 | 华为技术有限公司 | Method for realizing pilot frequency in wireless communication system |
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