CN101989970A - Method and equipment for sending demodulation pilot frequency signal - Google Patents
Method and equipment for sending demodulation pilot frequency signal Download PDFInfo
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- CN101989970A CN101989970A CN2009100907215A CN200910090721A CN101989970A CN 101989970 A CN101989970 A CN 101989970A CN 2009100907215 A CN2009100907215 A CN 2009100907215A CN 200910090721 A CN200910090721 A CN 200910090721A CN 101989970 A CN101989970 A CN 101989970A
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Abstract
The embodiment of the invention discloses a method and equipment for sending a demodulation pilot frequency signal. The method comprises the following steps that: a network side determines a position of the demodulation pilot frequency signal of which the fluxion is 8 in a radio beacon (RB) pair according to a downlink transmission mode of a user terminal; and the network side adds the demodulation pilot frequency signal at the position in the RB pair and sends the RB pair to the user terminal. By the method and the equipment provided by the embodiment of the invention, the requirement that high-order multiple input multiple output (MIMO) transmission is supported by the demodulation pilot frequency signal of which the fluxion is 8 farthest is met.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of sending method and equipment of demodulated pilot signal.
Background technology
Pilot signal is also referred to as reference signal, and (Reference Signal RS), is to offer a kind of known signal that receiving terminal is used for channel estimating or channel detection by transmitting terminal.Because wireless channel is a fading channel, the multidiameter delay expansion can cause the ISI (Inter-Symbol Interference, intersymbol interference) of OFDM (Orthogonal Frequency Division Multiplex, OFDM); And moving under the reception, because the caused frequency displacement of Doppler effect meeting destroys the orthogonality between the ofdm system subcarrier, cause ICI (Inter Carrier Interference disturbs between subcarrier).Therefore, transmitting terminal need insert pilot signal in the signal of emission, channel is followed the tracks of and estimated.In the running time-frequency resource of ofdm system, pilot signal is to be unit with RE (Resource Element, resource particle), and pilot signal takies a RE on the OFDM running time-frequency resource, i.e. OFDM symbol on subcarrier and the time domain on the frequency domain.For down-bound pilot frequency signal, mainly comprise two kinds of CRS (Common Reference Signal, common pilot signal) and DM-RS (Demodulated Reference Signal, demodulated pilot signal).
Because LTE (Long Term Evolution, Long Term Evolution) R8 (Release 8, version 8) agreement is only supported the Beamforming (beam shaping) of single codeword single current (Single layer), therefore only designed the descending demodulation pilot frequency of one group of single current.As shown in Figure 1, in the LTE R8 agreement, RB is to (i.e. 2 of a 1ms subframe 0.5ms time slots, 14 OFDM symbols of time domain, 12 subcarriers of frequency domain) preceding 3 classify PDCCH (Physical Downlink Control Channel as, Physical Downlink Control Channel) channel, the RE that the RE symbol of shade sign takies for public guide frequency CRS, the RE symbol of 12 dark colors is the DM-RS of single current.DM-RS is UE-Specific (terminal-specific), is defined as the RS that antenna port 5 (Port 5) sends, and represents with R5.
For supporting the LTE system to LTE-A (LTE-Advanced, advanced LTE) evolution of system, total demand to the design of LTE-A descending pilot frequency has been proposed in the prior art, DM-RS is used for PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) demodulation of data, descending demodulation pilot frequency DM-RS need support multi-streaming transmission mode, therefore at CoMP (CoordinatedMultiple Point, the collaboration type multiple spot) transmission, multithread Beamforming or enhancement mode MIMO (MultipleInput Multiple Output, multiple-input and multiple-output) in the technology, all needs to define multithread DM-RS pattern to support multithread (Multiple Layer) transmission.
In the LTE-A system, the descending high-order mimos transmission that requires 88 of maximum supports to receive.Correspondingly, need be the DM-RS of PDSCH data demodulates design 8 streams, support the Rank=8 transmission with maximum.But, only having designed one group of DM-RS pilot tone as shown in Figure 1 in the prior art, the PDSCH data demodulates of single current when it can only support Rank=1 can not be adapted to the demand of a plurality of DM-RS pilot tones of LTE-A evolution system.In the certain methods that prior art provides, design about multithread DM-RS pilot tone mainly is a situation of considering double fluid (Rank=2) and 4 stream (Rank=4) transmission, and following LTE-A system needs the maximum 8 rank MIMO of support transmission, and current 8 stream DM-RS designs at Rank=8 do not have discussion as yet.
Therefore, problems of the prior art are: adopt one group of DM-RS pilot tone in the existing LTE R8 agreement, can't be adapted to the demand that the multithread transmission of LTE-A system needs a plurality of DM-RS to support.In addition, reach the multithread DM-RS pilot tone that proposes in the prior art and be primarily aimed at 2 streams and 4 streams, can not satisfy the demand of high-order mimo transmission maximum demand 8 stream demodulated pilot signals supports.
Summary of the invention
Embodiments of the invention provide a kind of sending method and equipment of demodulated pilot signal, are used to satisfy the demand that high-order mimo transmission maximum demand 8 stream demodulated pilot signals are supported.
Embodiments of the invention provide a kind of sending method of demodulated pilot signal, comprising:
Network side is according to the downlink transfer pattern of user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering;
Described network side adds described demodulated pilot signal in the described position of RB centering, and the described user terminal of described RB subtend is sent;
In the described demodulated pilot signal, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode.
Wherein, described demodulated pilot signal has in the following characteristics one or more in the position distribution of RB centering:
Be distributed in the time domain boundary position of each RB to resource; Evenly place at time-frequency domain; Avoid conflicting with control channel or common pilot signal; Expense each RB centering is 24 RE to the maximum.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 5th, 12 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 5th, 12 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 12 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 16 RE in the expense of each RB centering.
Wherein, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 16 RE in the expense of each RB centering.
Wherein, described network side adds described demodulated pilot signal in the described position of RB centering, and the described user terminal transmission of described RB subtend is comprised:
According to described demodulated pilot signal, to need after data that user terminal sends and described demodulated pilot signal shine upon processing, being added on RB centering, and send to described user terminal.
Embodiments of the invention also provide a kind of network equipment, are used for the transmission of demodulated pilot signal, it is characterized in that, comprising:
Position determination unit is used for the downlink transfer pattern according to user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering; Concrete, in the described demodulated pilot signal, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode;
Transmitting element is used for the position definite according to described position determination unit, adds described demodulated pilot signal RB centering, and the described user terminal of described RB subtend is sent.
Wherein, described demodulated pilot signal has in the following characteristics one or more in the position distribution of RB centering:
Be distributed in the time domain boundary position of each RB to resource; Evenly place at time-frequency domain; Avoid conflicting with control channel or common pilot signal; Expense each RB centering is 24 RE to the maximum.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 5th, 12 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 5th, 12 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 12 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 16 RE in the expense of each RB centering.
Wherein, the definite demodulated pilot signal of described position determination unit is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 16 RE in the expense of each RB centering.
Wherein, described transmitting element specifically is used for:
According to described demodulated pilot signal, to need after data that user terminal sends and described demodulated pilot signal shine upon processing, being added on RB centering, and send to described user terminal.
Compared with prior art, embodiments of the invention have the following advantages:
The demand that high-order mimo transmission maximum demand 8 stream demodulated pilot signals are supported has been satisfied in the setting of the 8 stream demodulated pilot signals that send by the subtend user terminal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of the DM-RS pilot frequency mode of single current in the prior art;
Fig. 2 is the sending method flow chart of the demodulated pilot signal that provides among the embodiment in the invention;
Fig. 3 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment one provides among the present invention;
Fig. 4 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment two provides among the present invention;
Fig. 5 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment three provides among the present invention;
Fig. 6 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment four provides among the present invention;
Fig. 7 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment five provides among the present invention;
Fig. 8 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment six provides among the present invention;
Fig. 9 is the schematic diagram of the 8 stream DM-RS pilot frequency modes that embodiment seven provides among the present invention;
Figure 10 is the structural representation of the network equipment of the transmission that is used for demodulated pilot signal that provides in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
In the prior art, descending demodulation pilot frequency (DM-RS) is under Rank=3～8 situations, and the expense of each RB centering DM-RS pilot tone is 24 RE to the maximum, and in each Rank, the RE expense that the DM-RS of each stream (Layer) takies is all identical, and the design maximum of DM-RS can be supported 8 flow transmission.Consider comprehensively that in conjunction with demodulation performance and pilot-frequency expense when the high-order mimo that embodiments of the invention propose was supported the Rank=8 transmission, the DM-RS pilot signal was 24 RE to the maximum in the expense of each RB centering.
Consider the DM-RS pilot frequency multiplexing mode of a plurality of streams, can use FDM (Frequency DivisionMultiplexing, frequency division multiplexing), TDM (Time Division Multiplexing, time division multiplexing) or CDM (Code Division Multiplexing, code division multiplexing) mode, the perhaps mixed mode of 3 kinds of multiplex modes.When adopting the FDM/TDM hybrid mode, DM-RS on the various flows is at time domain/frequency domain quadrature, take different RE symbols respectively on time domain/frequency domain, therefore, the interference between the DM-RS of various flows correspondence is little, but because total DM-RS expense limited (being 24 RE to the maximum), cause the expense of the last DM-RS of each stream limited, for example, when Rank=8 transmits, each stream is gone up the DM-RS expense and is 3 RE to the maximum, and performance for estimating channel is restricted.When adopting pure CDM mode, DM-RS on the various flows is positioned at identical RE character position, but adopt mutually orthogonal spread spectrum code word to distinguish each other, move under the scene in low, middling speed, can obtain the performance identical with FDM/TDM, but in the high-speed mobile scene, because the quadrature between the code word destroys, the performance of channel estimating and demodulation reduces; But the advantage of CDM mode is: under certain identical with the RE position that the takies condition of DM-RS expense, be very suitable for pilot frequency mode and expand between different Rank, particularly under the scene of multiuser MIMO, can make full use of the resource of pilot signal.Take all factors into consideration above factor, the stream of 8 in embodiments of the invention DM-RS adopts FDM in conjunction with CDM hybrid multiplex mode.
In addition, need carry out channel estimating according to the DM-RS pilot signal at the UE end, and by the intersymbol interpolation, to obtain the channel of data symbol on the PDSCH zone, therefore, the performance of interpolation algorithm when channel estimating will be considered in the position of pilot signal, in in the embodiment of the invention the 8 stream DM-RS pilot signal transmission method, avoid the conflict of DM-RS and control channel (PDCCH takies the right preceding 3 row OFDM symbols of each RB) and common pilot signal (CRS sees Fig. 1 in the distribution of RB centering).In addition, pilot signal can be arranged on the time domain boundary position of each RB to resource.
A kind of sending method of demodulated pilot signal is provided in the embodiments of the invention, as shown in Figure 2, has comprised:
Step s201, network side be according to the downlink transfer pattern of user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering.
Step s202, network side add described demodulated pilot signal in the described position of RB centering, and the described user terminal of described RB subtend is sent.
Concrete, in the demodulated pilot signal sending method that embodiments of the invention provide, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode, and specifically can adopt length is 4 orthogonal intersection (Cover code) or 2 * 2 spread spectrum matrix differentiation.At the demodulation pilot frequency position of above-mentioned design pilot signal transmitted.
Concrete, definite mode of demodulated pilot signal position may further comprise the steps:
(1) DM-RS with 8 Port (port) under the Rank=8 is divided into 2 group RS_Port_Group 1 and RS_Port_Group 2 by port numbers, and each port is corresponding with each stream.Each group comprises the DM-RS of 4 Port, i.e. RS_Port_Group 1={DM- RS Port 0,1,2,3}, RS_Port_Group 2={DM-RS Port 4,5,6,7}.
(2) determine 2 row or the 4 row time domain OFDM symbols that DM-RS takies each RB centering.For avoiding the conflict with control channel PDCCH and common pilot signal CRS, 2 row that the DM-RS pilot tone takies or 4 row OFDM symbols can only be chosen in the 3rd, 5,6,9,10,12,13 row from 14 OFDM symbols (0～13).In addition, if further consider the effect of channel estimating interpolation, the OFDM symbol rank of choosing can be near the time domain border of PDSCH data area.
(3) in 2 row or 4 row time domain OFDM symbol ranks that the DM-RS that determines from step (2) takies, the RE pair that forms with adjacent per 2 RE is the unit, and (with 12 RE pair is example, then totally 24 RE to select several RE pair; With 8 RE pair is example, then totally 16 RE).
(4) several RE pair that choose in the step (3) are divided into 2 groups, with 12 RE pair is example, and then wherein 6 RE Pair (totally 12 RE) are one group, are designated as RE_Pair_Group 1, other 6 RE Pair (totally 12 RE) are one group, are designated as RE_Pair_Group 2.The RE Pair that RE Pair that RE_Pair_Group1 comprises and RE_Pair_Group 2 comprise occurs on frequency domain spaced reciprocally, takies different subcarriers respectively, and promptly RE_Pair_Group 1 and RE_Pair_Group 2 adopt the FDM mode to distinguish.
(5) DM-RS with 4 port of RS_Port_Group 1 in the step (1) is mapped on per 2 RE Pair (4 RE) resource of RE_Pair_Group 1 time domain direction, the DM-RS of 4 port takies 4 identical RE resources, and adopting length is that 4 orthogonal spectrum expansion code word or 2 * 2 orthogonal spectrum expansion matrix are distinguished.
(6) DM-RS with 4 port among the RS_Port_Group 2 in the step (1) is mapped on per 2 RE Pair (4 RE) resource of RE_Pair_Group 2 time domain directions, the DM-RS of 4 port takies 4 identical RE resources, and adopting length is that 4 orthogonal spectrum expansion code word or 2 * 2 orthogonal spectrum expansion matrix are distinguished.
(7), send the DM-RS pilot signal of 8 streams (Layers) in above-mentioned definite DM-RS pilot positions.
For the sending method of leading demodulated pilot signal in the better explanation embodiment of the invention, below in conjunction with specific embodiment, when transmitting at Rank=8 among the present invention, the DM-RS of 8 Port designs.
In the embodiments of the invention one, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 3.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 4 row OFDM symbols the (the 5th, 6,12,13 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 4 Cover code (orthogonal intersection) differentiation by length.The total RE expense of DM-RS is 24 RE.
Wherein, length is that the form of 4 Cover code is specially:
Time?Domain?cover?code：
[+1，+1，+1，+1]
[+1，+1，-1，-1]
[+1，-1，+1，-1]
[+1，-1，-1，+1]
In the embodiments of the invention two, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 4.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 2 row OFDM symbols the (the 3rd, 13 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 2 * 2 Covercode matrix differentiation by length.The total RE expense of DM-RS is 24 RE.
Wherein, the concrete form of 2 * 2 Cover code matrix is:
Time?Domain?cover?code：
[+1，+1]，[+1，-1]
Frequency?Domain?cover?code：
[+1，+1]，[+1，-1]
In the embodiments of the invention three, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 5.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 4 row OFDM symbols the (the 3rd, 5,10,12 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 2 * 2 Cover code matrix differentiation by length.The total RE expense of DM-RS is 24 RE.
Wherein, the concrete form of 2 * 2 Cover code matrix is:
Time?Domain?cover?code：
[+1，+1]，[+1，-1]
Frequency?Domain?cover?code：
[+1，+1]，[+1，-1]
In the embodiments of the invention four, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 6.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 4 row OFDM symbols the (the 3rd, 5,10,12 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 2 * 2 Cover code matrix differentiation by length.The total RE expense of DM-RS is 24 RE.
Wherein, the concrete form of 2 * 2 Cover code matrix is:
Time?Domain?cover?code：
[+1，+1]，[+1，-1]
Frequency?Domain?cover?code：
[+1，+1]，[+1，-1]
In the embodiments of the invention five, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 7.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 2 row OFDM symbols the (the 3rd, 12 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 2 * 2 Covercode matrix differentiation by length.The total RE expense of DM-RS is 24 RE.
Wherein, the concrete form of 2 * 2 Cover code matrix is:
Time?Domain?cover?code：
[+1，+1]，[+1，-1]
Frequency?Domain?cover?code：
[+1，+1]，[+1，-1]
In the embodiments of the invention six, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 8.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 4 row OFDM symbols the (the 5th, 6,12,13 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 4 Cover code differentiation by length.The total RE expense of DM-RS is 16 RE.
Wherein, length is that the form of 4 Cover code is specially:
Time?Domain?cover?code：
[+1，+1，+1，+1]
[+1，+1，-1，-1]
[+1，-1，+1，-1]
[+1，-1，-1，+1]
In the embodiments of the invention seven, the schematic diagram of the 8 stream DM-RS pilot frequency modes that provide as shown in Figure 9.Wherein:
First is designated the 0th row, then the DM-RS pilot tone takies 2 row OFDM symbols the (the 3rd, 13 row), 8 DM-RS port are divided into 2 groups, 2 shared RE of group lay respectively at dark color and the light color sign in the elliptic region, and the DM-RS of 2 groups adopts the FDM mode multiplexing, in same group (identical color), the DM-RS of 4 Port adopts the CDM mode multiplexing, is 2 * 2 Covercode matrix differentiation by length.The total RE expense of DM-RS is 16 RE.
Wherein, the concrete form of 2 * 2 Cover code matrix is:
Time?Domain?cover?code：
[+1，+1]，[+1，-1]
Frequency?Domain?cover?code：
[+1，+1]，[+1，-1]
Need to prove; the various 8 stream DM-RS pilot frequency modes that provide in the foregoing description are some the concrete application among the present invention; other 8 stream DM-RS pilot frequency mode based on inventive concept obtains also belongs to protection scope of the present invention, does not enumerate one by one at this.
Said method based on embodiment of the invention use, the base station can be according to demodulated pilot signal, after data and demodulation pilot signal shone upon processing, and the signal after will handling sends to user terminal, carries out demodulation by user terminal to the received signal according to the demodulated pilot signal in the signal.
The method that the embodiment of the application of the invention provides, the demand that high-order mimo transmission maximum demand 8 stream demodulated pilot signals are supported has been satisfied in the setting of the 8 stream demodulated pilot signals that send by the subtend user terminal.
Embodiments of the invention also provide a kind of network equipment, are used for the transmission of demodulated pilot signal, and its structure comprises as shown in figure 10:
Position determination unit 10 is used for the downlink transfer pattern according to user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering; Concrete, in the described demodulated pilot signal, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode.
Transmitting element 20 is used for the position determined according to position determination unit 10, adds demodulated pilot signal RB centering, and RB subtend user terminal is sent.Concrete, transmitting element 20 is according to demodulated pilot signal, to need being added on RB centering after data that user terminal sends and demodulated pilot signal shine upon processing, and sends to user terminal.
In the embodiment of the invention, the distribution of the demodulated pilot signal that position determination unit 10 is determined has one or more in the following characteristics: (1) is distributed in the time domain boundary position of each RB to resource; (2) evenly place at time-frequency domain; (3) avoid conflicting with control channel or common pilot signal; (4) expense each RB centering is 24 RE to the maximum.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 24 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 5th, 12 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 5th, 12 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 12 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; First is designated the 0th row, and demodulated pilot signal is 24 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 16 RE in the expense of each RB centering.
In one embodiment of the present of invention, the demodulated pilot signal that position determination unit 10 is determined is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 16 RE in the expense of each RB centering.
The equipment that the embodiment of the application of the invention provides, the demand that high-order mimo transmission maximum demand 8 stream demodulated pilot signals are supported has been satisfied in the setting of the 8 stream demodulated pilot signals that send by the subtend user terminal.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, unit in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the unit in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.A unit can be merged in the unit of the foregoing description, also can further split into a plurality of subelements.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Claims (20)
1. the sending method of a demodulated pilot signal is characterized in that, comprising:
Network side is according to the downlink transfer pattern of user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering;
Described network side adds described demodulated pilot signal in the described position of RB centering, and the described user terminal of described RB subtend is sent;
In the described demodulated pilot signal, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode.
2. the method for claim 1 is characterized in that, described demodulated pilot signal has in the following characteristics one or more in the position distribution of RB centering:
Be distributed in the time domain boundary position of each RB to resource; Evenly place at time-frequency domain; Avoid conflicting with control channel or common pilot signal; Expense each RB centering is 24 RE to the maximum.
3. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 24 RE in the expense of each RB centering.
4. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
5. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 5th, 12 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
6. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 5th, 12 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
7. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 12 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
8. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 16 RE in the expense of each RB centering.
9. method as claimed in claim 1 or 2 is characterized in that, described demodulated pilot signal is specially in the position of RB centering:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 16 RE in the expense of each RB centering.
10. method as claimed in claim 1 or 2 is characterized in that, described network side adds described demodulated pilot signal in the described position of RB centering, and the described user terminal transmission of described RB subtend is comprised:
According to described demodulated pilot signal, to need after data that user terminal sends and described demodulated pilot signal shine upon processing, being added on RB centering, and send to described user terminal.
11. a network equipment is characterized in that, is used for the transmission of demodulated pilot signal, it is characterized in that, comprising:
Position determination unit is used for the downlink transfer pattern according to user terminal, determines that fluxion is 8 the demodulated pilot signal position RB centering; Concrete, in the described demodulated pilot signal, the demodulated pilot signal of 8 streams is divided into 2 groups, every group of demodulated pilot signal that comprises 4 streams, 2 corresponding demodulated pilot signals of group are distinguished by frequency division multiplexing FDM mode, alternately take the different sub-carrier resources of RB centering; It is right that the demodulated pilot signal of 4 streams in each group takies some RE that are made up of adjacent 2 resource particle RE, distinguishes by code division multiplexing CDM mode;
Transmitting element is used for the position definite according to described position determination unit, adds described demodulated pilot signal RB centering, and the described user terminal of described RB subtend is sent.
12. network equipment as claimed in claim 11 is characterized in that, the described demodulated pilot signal that described position determination unit is determined has in the following characteristics one or more in the position distribution of RB centering:
Be distributed in the time domain boundary position of each RB to resource; Evenly place at time-frequency domain; Avoid conflicting with control channel or common pilot signal; Expense each RB centering is 24 RE to the maximum.
13., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 24 RE in the expense of each RB centering.
14., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
15., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 5th, 12 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
16., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 5,10,12 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Wherein the first group demodulation pilot signal takies the 3rd, 10 row totally 2 row OFDM symbols, and second group demodulated pilot signal takies the 5th, 12 row totally 2 row OFDM symbols; Demodulated pilot signal is 24 RE in the expense of each RB centering.
17., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 12 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 24 RE in the expense of each RB centering.
18., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 5th, 6,12,13 row totally 4 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by orthogonal intersection; Demodulated pilot signal is 16 RE in the expense of each RB centering.
19., it is characterized in that the demodulated pilot signal that described position determination unit is determined is specially in the position of RB centering as claim 11 or 12 described network equipments:
Right for each RB, first is designated the 0th row, demodulated pilot signal takies the 3rd, 13 row totally 2 row OFDM symbols, the demodulated pilot signal of 8 streams is divided into 2 groups, the demodulated pilot signal of 2 groups adopts the FDM mode multiplexing, in same group, the demodulated pilot signal of 4 streams adopts the CDM mode multiplexing, distinguishes by the spread spectrum matrix; Demodulated pilot signal is 16 RE in the expense of each RB centering.
20., it is characterized in that described transmitting element specifically is used for as claim 11 or 12 described network equipments:
According to described demodulated pilot signal, to need after data that user terminal sends and described demodulated pilot signal shine upon processing, being added on RB centering, and send to described user terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100907215A CN101989970A (en) | 2009-08-07 | 2009-08-07 | Method and equipment for sending demodulation pilot frequency signal |
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| CN2009100907215A CN101989970A (en) | 2009-08-07 | 2009-08-07 | Method and equipment for sending demodulation pilot frequency signal |
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Application publication date: 20110323 |