CN101287146A - Pilot sending and receiving method and device for special carrier - Google Patents
Pilot sending and receiving method and device for special carrier Download PDFInfo
- Publication number
- CN101287146A CN101287146A CNA2007101005657A CN200710100565A CN101287146A CN 101287146 A CN101287146 A CN 101287146A CN A2007101005657 A CNA2007101005657 A CN A2007101005657A CN 200710100565 A CN200710100565 A CN 200710100565A CN 101287146 A CN101287146 A CN 101287146A
- Authority
- CN
- China
- Prior art keywords
- subcarrier
- pilot signal
- pilot
- symbol
- subframe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to the field of wireless communication and discloses a method and a device for transmitting and receiving a pilot frequency in a special carrier wave. Sub-frames, with the time domain occupying four symbols, of the MBSFN of the special wave carry out channel estimation relatively accurately according to the pilot frequency. In the invention and in the MBSFN of the special carrier wave, as to the sub-frames occupying four symbols in the time domain, two or three sub-carrier waves of other signals are arranged between every two adjacent pilot frequency sub-carrier waves bearing the pilot signals in the same symbol. As to the proposal of bearing the pilot frequency by two symbols, the pilot frequency sub-carrier wave is configured among the sub-carrier waves with the number of one fourth of the two symbols, one symbol is arranged between the two symbols and the pilot frequency sub-carrier waves in the two symbols are diverged. As to the proposal of bearing the pilot frequency by one symbol, the symbol bearing the pilot frequency is not the symbol at the foremost or the hindmost of the sub-frames.
Description
Technical field
The present invention relates to wireless communication field, particularly pilot tone transmit-receive technology in the professional single frequency network of the multicast broadcast multimedia of special carrier.
Background technology
In the last few years, be subjected to people's extensive concern for the multi-carrier transmission technology of representative with OFDM (Orthogonal Frequency Division Multiplexing is called for short " OFDM ").Multi-carrier transmission is decomposed into several independently sub data flows to data flow, and each sub data flow will have much lower bit rate.The low rate multimode symbol that forms with such low bit rate removes to modulate corresponding subcarrier, has just constituted the transmission system that a plurality of low rate symbol parallels send.
OFDM is as a kind of multiplex technique, with multi-way signal multiplexing on the different orthogonal subcarrier.Traditional frequency division multiplexing (Frequency Division Multiplexing is called for short " FDM ") technology is divided into several subchannels with bandwidth, and the centre reduces interference with the protection frequency band, and they send data simultaneously.Ofdm system is wanted much less than the bandwidth of traditional FDM system requirements.Because use noiseless quadrature carrier technology, single intercarrier need not to protect frequency band.Make that like this service efficiency of usable spectrum is higher.In addition, the OFDM technology can dynamically be distributed in the data on the subchannel.For obtaining maximum data throughout, multi-carrier modulator can distribute more data intelligently to the little subchannel of noise.
At third generation partner program (3rd Generation Partnership Project, abbreviation " 3GPP ") Long Term Evolution (Long Term Evolution, abbreviation " LTE ") in the system, there are two kinds of frame structures to be applied to professional single frequency network (the Multicast Broadcast SingleFrequency Network of multicast broadcast multimedia of special carrier, be called for short " MBSFN "), be respectively normal frames structure (as shown in Figure 1) and candidate frame structure (as shown in Figure 2).
In the MBSFN normal frames, be spaced apart 7.5kHz between the dedicated subcarriers, there are two time slots the MBSFN subframe the inside of each special carrier, and each time slot has 3 OFDM symbols, i.e. 6 OFDM symbols altogether in the MBSFN subframe of a special carrier.And in the MBSFN candidate frame, there are 4 OFDM symbols the MBSFN subframe of each special carrier the inside.This shows that the smallest allocation time in two kinds of frame structures of MBSFN is as shown in table 1:
| Minimum distributes resource blocks | Number of sub carrier wave | Number of symbols |
| Generic frame structure normal frames structure | 24 | 6 |
| Alternative frame structure candidate frame structure | 24 | 4 |
Table 1
For the communication system of high data rate, adopt the coherent demodulation mode to obtain desirable receptivity usually.Because the realization of coherent demodulation need know certain channel information, therefore, carries out channel estimating at receiving terminal and is absolutely necessary.The task of channel estimating is to influence the transmission characteristic that the receiving sequence that has produced the distortion and the white Gauss noise that superposeed on amplitude and phase place accurately picks out channel time domain or frequency domain according to the channel that receives.Because in the high-speed radiocommunication system of OFDM, data are parallel transmission on different orthogonal sub-carriers, therefore, channel estimating will estimate the frequency response values of each subcarrier upper signal channel.The general mode that supplementary is arranged that adopts of the channel estimating of ofdm system is promptly inserted the known pilot signal of some receiving terminals in the fixed position of transmitting terminal channel, receiving terminal utilizes these pilot signals to carry out channel estimating according to certain algorithm.
At present, the pilot configuration of the MBSFN normal frames of special carrier has three kinds of structures as shown in Figure 3, and K represents the subcarrier sequence number among the figure, and L represents the symbol sequence number.
But, the present inventor finds, because the smallest allocation Resource Block of candidate frame structure is different with the smallest allocation Resource Block of normal frames structure, as: distributing to the number of symbols that the least resource piece of MBSFN normal frames comprises is 6, and the number of symbols that the least resource piece of distributing to the MBSFN candidate frame comprises is 4, therefore, pilot configuration as shown in Figure 3 can not be directly used in the pilot configuration of the MBSFN candidate frame of special carrier.
Summary of the invention
The technical problem underlying that embodiment of the present invention will solve provides pilot tone receiving/transmission method and equipment in a kind of special carrier, and the subframe that accounts for four symbols for time domain among the MBSFN of special carrier can be carried out channel estimating comparatively exactly according to pilot tone.
For solving the problems of the technologies described above, embodiments of the present invention provide pilot sending method in a kind of special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, when being sent in time domain and accounting for the subframe of four symbols, pilot signal transmitted in the parton carrier wave of two symbols in this subframe, in each symbol of these two symbols, each pilot signal transmitted in the subcarrier of 1/4th numbers, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds in the prosign.
Embodiments of the present invention also provide pilot reception method in a kind of special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, when being received in time domain and accounting for the subframe of four symbols, in two symbols of this subframe, receive pilot signal in each subcarrier of carrying pilot signal, the subcarrier carrying pilot signal that 1/4th numbers are respectively arranged in each symbol of these two symbols, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent carrying pilot signals.
Embodiments of the present invention also provide pilot tone transmitting apparatus in a kind of special carrier, are used for the professional single frequency network of multicast broadcast multimedia of special carrier, comprise:
Mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of two symbols in this subframe, in each symbol of these two symbols, respectively have in the subcarrier of 1/4th numbers to be mapped with pilot signal, and the subcarrier of other signals of three carryings except that this pilot signal at interval between per two adjacent subcarriers that are mapped with pilot signal in the prosign;
Transmitter module, being used for aloft, interface sends the subframe that mapping block is exported.
Embodiments of the present invention also provide pilot reception equipment in a kind of special carrier, are used for the professional single frequency network of multicast broadcast multimedia of special carrier, comprise:
Receiver module is used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain;
The pilot tone acquisition module, be used for from each subcarrier of two symbols carrying pilot signals of the subframe of receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/4th numbers are respectively arranged in each symbol of these two symbols, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent carrying pilot signals.
Embodiments of the present invention also provide pilot sending method in a kind of special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, when being sent in time domain and accounting for the subframe of four symbols, pilot signal transmitted in the parton carrier wave of a symbol in this subframe, in this symbol, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of other signals of two carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds.
Embodiments of the present invention also provide pilot reception method in a kind of special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, when being received in time domain and accounting for the subframe of four symbols, in a symbol of this subframe, receive pilot signal in the subcarrier of carrying pilot signal, the subcarrier carrying pilot signal that 1/3rd numbers are arranged in this symbol, and the subcarrier of other signals of next but two carrying except that this pilot signal between between the subcarrier of per two adjacent carrying pilot signals.
Embodiments of the present invention also provide pilot tone transmitting apparatus in a kind of special carrier, are used for the professional single frequency network of multicast broadcast multimedia of special carrier, comprise:
Mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of a symbol in this subframe, in this symbol, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of other signals of two carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds;
Transmitter module, being used for aloft, interface sends the subframe that mapping block is exported.
Embodiments of the present invention also provide pilot reception equipment in a kind of special carrier, are used for the professional single frequency network of multicast broadcast multimedia of special carrier, comprise:
Receiver module is used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain;
The pilot tone acquisition module, be used for from each subcarrier of a symbol carrying pilot signal of the subframe of receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/3rd numbers are arranged in this symbol, and the subcarrier of other signals of next but two carrying except that this pilot signal between between the subcarrier of per two adjacent carrying pilot signals.
The main effect of embodiment of the present invention is to utilize preferably pilot tone to carry out channel estimating.This be because, in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send out identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, between the adjacent pilot frequencies subcarrier only between the mode of subcarrier of next but two or three other signals can meet this requirement.
Description of drawings
Fig. 1 is the MBSFN normal frames structural representation of special-purpose carrier wave in the prior art;
Fig. 2 is the MBSFN candidate frame structural representation of special-purpose carrier wave in the prior art;
Fig. 3 is the pilot configuration schematic diagram of the MBSFN normal frames of special-purpose carrier wave in the prior art;
Fig. 4 is according to pilot sending method flow chart in the special carrier of first embodiment of the invention;
Fig. 5 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to first and the 3rd symbol in the first embodiment of the invention;
Fig. 6 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to second and the 4th symbol in the first embodiment of the invention;
Fig. 7 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to first and the 3rd symbol in the second embodiment of the invention;
Fig. 8 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to second and the 4th symbol in the second embodiment of the invention;
Fig. 9 is mapped to pilot signal in schematic diagram in the parton carrier wave of first and the 3rd symbol according to a kind of in the third embodiment of the invention;
Figure 10 is mapped to pilot signal in schematic diagram in the parton carrier wave of first and the 3rd symbol according to the another kind in the third embodiment of the invention;
Figure 11 is mapped to pilot signal in schematic diagram in the parton carrier wave of second and the 4th symbol according to a kind of in the third embodiment of the invention;
Figure 12 is mapped to pilot signal in schematic diagram in the parton carrier wave of second and the 4th symbol according to the another kind in the third embodiment of the invention;
Figure 13 is according to pilot reception method flow diagram in the special carrier of four embodiment of the invention;
Figure 14 is according to pilot tone transmitting apparatus structural representation in the special carrier of fifth embodiment of the invention;
Figure 15 is according to pilot reception device structure schematic diagram in the special carrier of sixth embodiment of the invention;
Figure 16 is according to pilot sending method flow chart in the special carrier of seventh embodiment of the invention;
Figure 17 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to second symbol in the seventh embodiment of the invention;
Figure 18 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to the 3rd symbol in the seventh embodiment of the invention;
Figure 19 is mapped to pilot signal in schematic diagram in the parton carrier wave of first symbol according to the supposition in the seventh embodiment of the invention;
Figure 20 is mapped to pilot signal in schematic diagram in the parton carrier wave of the 4th symbol according to the supposition in the seventh embodiment of the invention;
Figure 21 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to second symbol in the eighth embodiment of the invention;
Figure 22 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to the 3rd symbol in the eighth embodiment of the invention;
Figure 23 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to second symbol in the ninth embodiment of the invention;
Figure 24 is according to the schematic diagram in the parton carrier wave that pilot signal is mapped to the 3rd symbol in the ninth embodiment of the invention;
Figure 25 is according to pilot reception method flow diagram in the special carrier of tenth embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First execution mode of the present invention relates to pilot sending method in a kind of special carrier, and the MBSFN frame of the special carrier that sends in the present embodiment is a candidate frame, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.Idiographic flow as shown in Figure 4.
In step 410, transmitting terminal is mapped to pilot signal in the MBSFN subframe that accounts for 4 OFDM symbols on time domain.
Specifically, transmitting terminal is mapped to pilot signal in the parton carrier wave on two OFDM symbols in the MBSFN subframe, symbol at interval between these two symbols.That is to say, pilot signal is mapped in the parton carrier wave on first and the 3rd OFDM symbol in the MBSFN subframe (as shown in Figure 5); Perhaps, pilot signal is mapped in the parton carrier wave on second and the 4th OFDM symbol in the MBSFN subframe (as shown in Figure 6).
Since between two symbols of carrying pilot signal at interval a symbol, therefore, if a plurality of continuous MBSFN subframes are arranged, the symbol that then carries pilot tone also can be equably between these subframes symbol at interval.The symbol of carrying pilot tone be evenly distributed with the signal that is beneficial in each symbol generally by coherent demodulation preferably.In addition, in the MBSFN of special carrier, the interval of a symbol can guarantee receiving system not obvious decline of performance when 350 kilometers of speed per hours, can be fit to the needs of most of scene.
And, in each symbol of these two carrying pilot signals, respectively have in the subcarrier of 1/4th numbers and be mapped with pilot signal, and the subcarrier of three other signals of carrying (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) at interval between per two adjacent subcarriers that are mapped with pilot signal in the prosign is so that utilize pilot tone to carry out channel estimating preferably.This be because, in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, and the mode of the subcarrier of three other signal in interval can meet this requirement between the adjacent pilot frequencies subcarrier.
In addition, pilot sub-carrier also need be diverged on frequency domain in the symbol of two carrying pilot tones, that is to say, in two symbols of carrying pilot signal, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X in symbol, and the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the subframe, K 〉=0,1 〉=X 〉=0.In the present embodiment, K=0,1,2...5, X=0 is as Fig. 5 or shown in Figure 6.
Be not difficult to find, the carrying pilot signal two symbols in (as first OFDM symbol and the 3rd OFDM symbol, or second OFDM symbol and the 4th OFDM symbol), the subcarrier of carrying pilot signal always is arranged on the subcarrier in the middle of the subcarrier of adjacent two the carrying pilot signals of another one symbol in symbol.Thereby a limited number of pilot sub-carrier is distributed on as much as possible the subcarrier, when channel estimating, can obtains the effect of frequency diversity.
Then, enter step 420, the MBSFN subframe that transmitting terminal will be mapped with pilot signal sends to receiving terminal by air interface.
Because in the present embodiment, therefore the subcarrier of three other signals in interval between the pilot sub-carrier of per two adjacent carrying pilot signals has utilized pilot tone to carry out channel estimating preferably in the symbol of same carrying pilot tone.And because pilot sub-carrier is configured in the subcarrier of 1/4th numbers of symbol of two carrying pilot tones, for the subframe that accounts for four symbols in time domain, it is 1/8 that the number of pilot tone time-frequency piece accounts for time-frequency piece total number ratio.The performance that the number of pilot tone time-frequency piece accounts for the high more coherent demodulation of time-frequency piece total number ratio is good more, and it is few more that the number of pilot tone time-frequency piece accounts for the low more expense of time-frequency piece total number ratio.And 1/8 be a moderate ratio, therefore can take into account the performance of expense and coherent demodulation.
Second execution mode of the present invention relates to pilot sending method in a kind of special carrier, the present embodiment and first execution mode are roughly the same, its difference is, in the first embodiment, the subcarrier of pilot signal transmitted is that sequence number is the subcarrier of N+4K+2 in first or second symbol, the subcarrier of pilot signal transmitted is that sequence number is the subcarrier of N+4K in the 3rd or the 4th symbol, wherein, N is the Base Serial Number of continuous subcarrier in the subframe, K=0,1,2...5.And in the present embodiment, the subcarrier of pilot signal transmitted is that sequence number is the subcarrier of N+4K+2 in the 3rd or the 4th symbol, the subcarrier of pilot signal transmitted is that sequence number is the subcarrier of N+4K in first or second symbol, wherein, N is the Base Serial Number of continuous subcarrier in the subframe, K=0,1,2...5, as Fig. 7 or shown in Figure 8.
Be not difficult to find that the present embodiment and first execution mode there is no the difference of essence, therefore, can reach the effect described in first execution mode fully.
The 3rd execution mode of the present invention relates to pilot sending method in a kind of special carrier, the present embodiment and first execution mode are roughly the same, its difference is, in the first embodiment, in two symbols of carrying pilot signal, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X+2 in another symbol, N is the Base Serial Number of continuous subcarrier in the subframe, K=0,1,2...5, X=0.And in the present embodiment, K=0,1,2...5, X=1, that is to say that the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+1 in symbol, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+1+2 in another symbol, N is the Base Serial Number of continuous subcarrier in the subframe, K=0,1,2...5.
This shows, if pilot signal is mapped in the aforesaid parton carrier wave on first and the 3rd OFDM symbol in the MBSFN subframe, then pilot configuration such as Fig. 9 or shown in Figure 10; If pilot signal is mapped in the parton carrier wave on second and the 4th OFDM symbol in the MBSFN subframe, then pilot configuration such as Figure 11 or shown in Figure 12.
Be not difficult to find that the present embodiment and first execution mode there is no the difference of essence, therefore, can reach the effect described in first execution mode fully.
The 4th execution mode of the present invention relates to pilot reception method in a kind of special carrier, corresponding to pilot sending method in the special carrier of the respective embodiments described above.That is to say that the MBSFN frame of the special carrier that receives in the present embodiment is a candidate frame, promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.Idiographic flow as shown in figure 13.
In step 1310, receiving terminal receives wireless signal from air interface, obtains accounting on time domain the MBSFN subframe of 4 OFDM symbols.
Then, enter step 1320, obtain pilot signal in each subcarrier of receiving terminal carrying pilot signal from two symbols of the subframe that obtains, and, 1 symbol at interval between these two symbols.Symbol with carrying pilot signal in subframe is that example describes for first with the 3rd symbol below.
Because in first and the 3rd symbol, each carries pilot signal in the subcarrier of 1/4th numbers, and the subcarrier of three other signals of carrying (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) at interval between the subcarrier of per two adjacent carrying pilot signals.In these two symbols of carrying pilot signal, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the subframe, K 〉=0,1 〉=X 〉=0.Therefore, receiving terminal can receive pilot signal by these known rules in the parton carrier wave in first and the 3rd symbol.And, be not difficult to find, in above-mentioned first symbol and the 3rd symbol, the subcarrier of carrying pilot signal always is positioned on the subcarrier in the middle of the subcarrier of adjacent two carrying pilot signals on the another one symbol on symbol, because a limited number of pilot sub-carrier is evenly distributed on as much as possible the subcarrier, thereby receiving terminal can obtain the effect of frequency diversity when channel estimating.
The 5th execution mode of the present invention relates to pilot tone transmitting apparatus in a kind of special carrier, and in the present embodiment, the MBSFN frame of special carrier is a candidate frame, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.
The pilot tone transmitting apparatus as shown in figure 14 in this special carrier, comprise: mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of two symbols in this subframe, in each symbol of these two symbols, respectively have in the subcarrier of 1/4th numbers to be mapped with pilot signal, and in the prosign between per two adjacent subcarriers that are mapped with pilot signal at interval the subcarriers of three other signals of carrying (as the data subcarrier, the pilot sub-carrier of other antenna, or do not carry the subcarrier of any signal); And transmitter module, being used for aloft, interface sends the subframe that this mapping block is exported.
In addition, this symbol and/or subcarrier that is mapped with pilot signal also satisfies one of following feature or its combination in any: be mapped with between two symbols of pilot signal symbol at interval; In being mapped with two symbols of pilot signal, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the subframe, K 〉=0,1 〉=X 〉=0.By pilot sub-carrier in the symbol of two carrying pilot tones is diverged on frequency domain, a limited number of pilot sub-carrier is distributed on as much as possible the subcarrier, thereby when channel estimating, can obtains the effect of frequency diversity.
Because in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send out identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, and the mode of the subcarrier of three other signal in interval can meet this requirement between the adjacent pilot frequencies subcarrier.Therefore, the subcarrier of three other signals in interval between the pilot sub-carrier of per two adjacent carrying pilot signals can utilize pilot tone to carry out channel estimating preferably in the same symbol.
Need to prove that each module in the present embodiment is logic module, in actual applications, various physics realization mode can be arranged.
The 6th execution mode of the present invention relates to pilot reception equipment in a kind of special carrier, and the MBSFN frame of special-purpose carrier wave is a candidate frame in the present embodiment, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.Pilot reception equipment is used for receiving the pilot signal that the pilot tone transmitting apparatus is sent in the special carrier of the 5th execution mode in the special carrier in the present embodiment.
Pilot reception equipment comprises as shown in figure 15 in this special carrier: receiver module, be used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain; The pilot tone acquisition module, be used for from each subcarrier of two symbols carrying pilot signals of the subframe of this receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/4th numbers are respectively arranged in each symbol of these two symbols, and the subcarrier of three other signals of carrying (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) at interval between the subcarrier of per two adjacent carrying pilot signals.
In addition, these two symbols and/or the subcarrier of carrying pilot signal also satisfy one of following feature or its combination in any: symbol in interval between two symbols of carrying pilot signal; In two symbols of carrying pilot signal, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the subframe, K 〉=0,1 〉=X 〉=0.
Need to prove that each module in the present embodiment is logic module, in actual applications, various physics realization mode can be arranged.
The 7th execution mode of the present invention relates to pilot sending method in a kind of special carrier, and the MBSFN frame of the special carrier that sends in the present embodiment is a candidate frame, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.Idiographic flow as shown in figure 16.
In step 1610, transmitting terminal is mapped to pilot signal in the parton carrier wave of a symbol in the MBSFN subframe that accounts for 4 OFDM symbols on time domain.
Specifically, in the symbol of this carrying pilot signal, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of two other signals of carrying (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) at interval between the subcarrier of per two adjacent pilot signal transmitteds.Transmitting terminal can be mapped to pilot signal in the parton carrier wave of second symbol in the MBSFN subframe, as shown in figure 17; Also pilot signal can be mapped in the parton carrier wave of the 3rd symbol in the MBSFN subframe, as shown in figure 18.
Because in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send out identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, and the mode of the subcarrier of two other signal in interval can meet this requirement between the adjacent pilot frequencies subcarrier.Therefore, in the present embodiment, the subcarriers of other signals of two carryings in interval can utilize pilot tone to carry out channel estimating preferably between per two adjacent subcarriers that are mapped with pilot signal.
And, because in the present embodiment, the symbol of carrying pilot tone is not the symbol of head or tail (promptly be not first or the 4th symbol) in the subframe, therefore can make the time-frequency piece (abbreviating data time-frequency piece as) of carrying data as much as possible can be close to the time-frequency piece (abbreviating pilot tone time-frequency piece as) that carries pilot tone, and data time-frequency piece result when coherent demodulation of next-door neighbour's pilot tone time-frequency piece is more accurate.Otherwise, if pilot tone time-frequency piece is placed on the 1st symbol the front adjacent be unicast sub, the data time-frequency piece that then has only the 2nd symbol is (as shown in figure 19) of next-door neighbour's pilot tone time-frequency piece, if pilot tone time-frequency piece is placed on the 4th symbol the back adjacent be unicast sub, the data time-frequency piece that then has only the 3rd symbol is (as shown in figure 20) of next-door neighbour's pilot tone time-frequency piece.
The 8th execution mode of the present invention relates to pilot sending method in a kind of special carrier, present embodiment and the 7th execution mode are roughly the same, its difference is that in the 7th execution mode, transmitting terminal begins pilot signal transmitted at first subcarrier of second or the 3rd symbol of subframe; And in the present embodiment, transmitting terminal begins pilot signal transmitted at second subcarrier of second or the 3rd symbol of subframe, as Figure 21 or shown in Figure 22.
Be not difficult to find that present embodiment and the 7th execution mode there is no the difference of essence, therefore, can reach the effect described in the 7th execution mode fully.
The 9th execution mode of the present invention relates to pilot sending method in a kind of special carrier, present embodiment and the 7th execution mode are roughly the same, its difference is that in the 7th execution mode, transmitting terminal begins pilot signal transmitted at first subcarrier of second or the 3rd symbol of subframe; And in the present embodiment, transmitting terminal begins pilot signal transmitted at the 3rd subcarrier of second or the 3rd symbol of subframe, as Figure 23 or shown in Figure 24.
Be not difficult to find that present embodiment and the 7th execution mode there is no the difference of essence, therefore, can reach the effect described in the 7th execution mode fully.
The tenth execution mode of the present invention relates to pilot reception method in a kind of special carrier, present embodiment is corresponding to pilot sending method in the special carrier in the 7th to the 9th execution mode, that is to say, the MBSFN frame of the special carrier that receives in the present embodiment is a candidate frame, be that each MBSFN subframe accounts for 4 OFDM symbols on time domain, on frequency domain, account for 24 subcarriers.Idiographic flow as shown in figure 25.
In step 2510, receiving terminal receives wireless signal from air interface, obtains accounting on time domain the MBSFN subframe of 4 OFDM symbols.
Then, enter step 2520, receive pilot signal in each subcarrier of receiving terminal carrying pilot signal from a symbol of the subframe that obtains.Symbol with carrying pilot signal in subframe is that second symbol is that example describes below.
Because the subcarrier carrying pilot signal of 1/3rd numbers is arranged in second symbol, and next but two carries the subcarrier (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) of other signals between between the subcarrier of per two adjacent carrying pilot signals.Therefore, receiving terminal can be by receiving pilot signal in the parton carrier wave of these known rules in second symbol.
The 11 execution mode of the present invention relates to pilot tone transmitting apparatus in a kind of special carrier, and in the present embodiment, the MBSFN frame of special carrier is a candidate frame, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.
The pilot tone transmitting apparatus comprises in this special carrier: mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of a symbol in this subframe, in this symbol, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of two other signals of carrying (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) at interval between the subcarrier of per two adjacent pilot signal transmitteds; And transmitter module, being used for aloft, interface sends the subframe that this mapping block is exported.
In the present embodiment, mapping block is mapped to pilot signal in the parton carrier wave of second or the 3rd symbol of MBSFN subframe, rather than the symbol of head (first) or tail (the 4th) in the subframe, so that data time-frequency piece as much as possible can be close to pilot tone time-frequency piece, and data time-frequency piece result when coherent demodulation of next-door neighbour's pilot tone time-frequency piece is more accurate.
Because in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send out identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, between the adjacent pilot frequencies subcarrier only between the mode of subcarrier of other signal of next but two can meet this requirement.Therefore, in the same symbol between the pilot sub-carrier of per two adjacent carrying pilot signals between the subcarrier of other signal of next but two, can utilize pilot tone to carry out channel estimating preferably.
The 12 execution mode of the present invention relates to pilot reception equipment in a kind of special carrier, and the MBSFN frame of special-purpose carrier wave is a candidate frame in the present embodiment, and promptly each MBSFN subframe accounts for 4 OFDM symbols on time domain, accounts for 24 subcarriers on frequency domain.Pilot reception equipment is used for receiving the pilot signal that the pilot tone transmitting apparatus is sent in the special carrier of the 9th execution mode in the special carrier in the present embodiment.
Pilot reception equipment comprises in this special carrier: receiver module, be used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain; With the pilot tone acquisition module, be used for from each subcarrier of a symbol carrying pilot signal of the subframe of this receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/3rd numbers are arranged in this symbol, and next but two carries the subcarrier (as the pilot sub-carrier of data subcarrier, other antenna or do not carry the subcarrier of any signal) of other signals between between the subcarrier of per two adjacent carrying pilot signals.The symbol of carrying pilot signal is second or the 3rd symbol in this subframe.
In sum, in embodiments of the present invention, in the same symbol between the pilot sub-carrier of per two adjacent carrying pilot signals between the subcarrier of next but two or three other signals, can utilize pilot tone to carry out channel estimating preferably.This be because, in MBSFN, a plurality of neighbor cells use identical running time-frequency resource to send out identical content, so multidiameter delay is bigger, frequency domain correlation bandwidth is the inverse of multidiameter delay, corresponding meeting is less, and in the prosign pilot sub-carrier use within frequency domain correlation bandwidth the time at the interval on the frequency domain this pilot tone carry out channel estimating fruit just can be better.For the MBSFN of special carrier, subcarrier spacing is 7.5kHz, between the adjacent pilot frequencies subcarrier only between the mode of subcarrier of next but two or three other signals can meet this requirement.
For the scheme of two symbols carry pilot tones, pilot sub-carrier is configured in the subcarrier of 1/4th numbers of two symbols, and for the subframe that accounts for four symbols in time domain, it is 1/8 that the number of pilot tone time-frequency piece accounts for time-frequency piece total number ratio.The performance that the number of pilot tone time-frequency piece accounts for the high more coherent demodulation of time-frequency piece total number ratio is good more, and it is few more that the number of pilot tone time-frequency piece accounts for the low more expense of time-frequency piece total number ratio.The 1/8th, moderate ratio can be taken into account the performance of expense and coherent demodulation.
For the scheme of two symbols carry pilot tones, symbol at interval between these two symbols, if a plurality of continuous MBSFN subframes are arranged, the symbol that then carries pilot tone also can be equably between these subframes symbol at interval.The symbol of carrying pilot tone be evenly distributed with the signal that is beneficial in each symbol generally by coherent demodulation preferably.In addition, in the MBSFN of special carrier, the interval of a symbol can guarantee receiving system not obvious decline of performance when 350 kilometers of speed per hours, can be fit to the needs of most of scene.
For the scheme of two symbols carry pilot tones, pilot sub-carrier is diverged on frequency domain in the symbol of two carrying pilot tones, and a limited number of pilot sub-carrier is distributed on as much as possible the subcarrier, thereby can obtain the effect of frequency diversity when channel estimating.
Scheme for a symbols carry pilot tone, the symbol of carrying pilot tone is not the symbol of head or tail in the subframe, this can make data time-frequency piece as much as possible can be close to pilot tone time-frequency piece, and data time-frequency piece result when coherent demodulation of next-door neighbour's pilot tone time-frequency piece is more accurate.Otherwise, if pilot tone time-frequency piece is placed on the 1st symbol the front adjacent be unicast sub, the data time-frequency piece that then has only the 2nd symbol is next-door neighbour's pilot tone time-frequency piece, if pilot tone time-frequency piece is placed on the 4th symbol the back adjacent be unicast sub, the data time-frequency piece that then has only the 3rd symbol is next-door neighbour's pilot tone time-frequency piece.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (25)
1. pilot sending method in the special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, it is characterized in that, when being sent in time domain and accounting for the subframe of four symbols, pilot signal transmitted in the parton carrier wave of two symbols in this subframe, in each symbol of these two symbols, each pilot signal transmitted in the subcarrier of 1/4th numbers, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds in the prosign.
2. pilot sending method in the special carrier according to claim 1 is characterized in that, symbol in interval between described two symbols of pilot signal transmitted.
3. pilot sending method in the special carrier according to claim 1, it is characterized in that, in described two symbols of pilot signal transmitted, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X+2 in another symbol, and wherein N, K, X are integer, and N is the Base Serial Number of continuous subcarrier in the described subframe, K 〉=0,1 〉=X 〉=0.
4. according to pilot sending method in each described special carrier in the claim 1 to 3, it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system.
5. pilot reception method in the special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, it is characterized in that, when being received in time domain and accounting for the subframe of four symbols, in two symbols of this subframe, receive pilot signal in each subcarrier of carrying pilot signal, the subcarrier carrying pilot signal that 1/4th numbers are respectively arranged in each symbol of these two symbols, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent carrying pilot signals.
6. pilot reception method in the special carrier according to claim 5 is characterized in that, the described symbol and/or the subcarrier of carrying pilot signal also satisfy one of following feature or its combination in any:
Symbol in interval between described two symbols of carrying pilot signal;
In described two symbols of carrying pilot signal, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the described subframe, K 〉=0,1 〉=X 〉=0.
7. according to pilot reception method in claim 5 or the 6 described special carriers, it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system.
8. pilot tone transmitting apparatus in the special carrier is used for the professional single frequency network of multicast broadcast multimedia of special carrier, it is characterized in that, comprises:
Mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of two symbols in this subframe, in each symbol of these two symbols, respectively have in the subcarrier of 1/4th numbers to be mapped with pilot signal, and the subcarrier of other signals of three carryings except that this pilot signal at interval between per two adjacent subcarriers that are mapped with pilot signal in the prosign;
Transmitter module, being used for aloft, interface sends the subframe that described mapping block is exported.
9. pilot tone transmitting apparatus in the special carrier according to claim 8 is characterized in that, described mapping block is mapped to pilot signal symbol and/or the subcarrier that satisfies one of following feature or its combination in any:
Be mapped with between described two symbols of pilot signal symbol at interval;
In being mapped with described two symbols of pilot signal, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of pilot signal transmitted is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the described subframe, K 〉=0,1 〉=X 〉=0.
10. pilot tone transmitting apparatus according to Claim 8 or in the 9 described special carriers is characterized in that, described subframe is the subframe in the candidate frame structure of long evolving system.
11. pilot reception equipment in the special carrier is used for the professional single frequency network of multicast broadcast multimedia of special carrier, it is characterized in that, comprises:
Receiver module is used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain;
The pilot tone acquisition module, be used for from each subcarrier of two symbols carrying pilot signals of the subframe of described receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/4th numbers are respectively arranged in each symbol of these two symbols, and the subcarrier of other signals of three carryings except that this pilot signal at interval between the subcarrier of per two adjacent carrying pilot signals.
12. pilot reception equipment is characterized in that in the special carrier according to claim 11, described pilot tone acquisition module obtains pilot signal from the symbol that satisfies one of following feature or its combination in any and/or subcarrier:
Symbol in interval between described two symbols of carrying pilot signal;
In described two symbols of carrying pilot signal, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X in symbol, the subcarrier of carrying pilot signal is the subcarrier that sequence number is N+4K+X+2 in another symbol, wherein N, K, X are integer, N is the Base Serial Number of continuous subcarrier in the described subframe, K 〉=0,1 〉=X 〉=0.
13., it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system according to pilot reception equipment in claim 11 or the 12 described special carriers.
14. pilot sending method in the special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, it is characterized in that, when being sent in time domain and accounting for the subframe of four symbols, pilot signal transmitted in the parton carrier wave of a symbol in this subframe, in this symbol, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of other signals of two carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds.
15. pilot sending method in the special carrier according to claim 14 is characterized in that, the described symbol of pilot signal transmitted is second or the 3rd symbol in the described subframe.
16., it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system according to pilot sending method in claim 14 or the 15 described special carriers.
17. pilot reception method in the special carrier, the professional single frequency network of multicast broadcast multimedia that is used for special carrier, it is characterized in that, when being received in time domain and accounting for the subframe of four symbols, in a symbol of this subframe, receive pilot signal in the subcarrier of carrying pilot signal, the subcarrier carrying pilot signal that 1/3rd numbers are arranged in this symbol, and the subcarrier of other signals of next but two carrying except that this pilot signal between between the subcarrier of per two adjacent carrying pilot signals.
18. the pilot reception method is characterized in that in the special carrier according to claim 17, the described symbol of carrying pilot signal is second or the 3rd symbol in the described subframe.
19., it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system according to pilot reception method in claim 17 or the 18 described special carriers.
20. pilot tone transmitting apparatus in the special carrier is used for the professional single frequency network of multicast broadcast multimedia of special carrier, it is characterized in that, comprises:
Mapping block, be used for pilot signal is mapped to the subframe that accounts for four symbols in time domain, wherein, pilot signal is mapped in the parton carrier wave of a symbol in this subframe, in this symbol, pilot signal transmitted in the subcarrier of 1/3rd numbers, and the subcarrier of other signals of two carryings except that this pilot signal at interval between the subcarrier of per two adjacent pilot signal transmitteds;
Transmitter module, being used for aloft, interface sends the subframe that described mapping block is exported.
21. the pilot tone transmitting apparatus is characterized in that in the special carrier according to claim 20, described mapping block is mapped to pilot signal in the parton carrier wave of second or the 3rd symbol in the described subframe.
22., it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system according to pilot tone transmitting apparatus in claim 20 or the 21 described special carriers.
23. pilot reception equipment in the special carrier is used for the professional single frequency network of multicast broadcast multimedia of special carrier, it is characterized in that, comprises:
Receiver module is used for receiving wireless signal from air interface, and the result who receives is exported by the subframe form that accounts for four symbols in time domain;
The pilot tone acquisition module, be used for from each subcarrier of a symbol carrying pilot signal of the subframe of described receiver module output, obtaining pilot signal, the subcarrier carrying pilot signal that 1/3rd numbers are arranged in this symbol, and the subcarrier of other signals of next but two carrying except that this pilot signal between between the subcarrier of per two adjacent carrying pilot signals.
24. pilot reception equipment is characterized in that in the special carrier according to claim 23, described pilot tone acquisition module obtains pilot signal in each subcarrier of carrying pilot signal in second or the 3rd symbol from described subframe.
25., it is characterized in that described subframe is the subframe in the candidate frame structure of long evolving system according to pilot reception equipment in claim 23 or the 24 described special carriers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101005657A CN101287146A (en) | 2007-04-10 | 2007-04-10 | Pilot sending and receiving method and device for special carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101005657A CN101287146A (en) | 2007-04-10 | 2007-04-10 | Pilot sending and receiving method and device for special carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101287146A true CN101287146A (en) | 2008-10-15 |
Family
ID=40059073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101005657A Pending CN101287146A (en) | 2007-04-10 | 2007-04-10 | Pilot sending and receiving method and device for special carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101287146A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010108364A1 (en) * | 2009-03-23 | 2010-09-30 | 中兴通讯股份有限公司 | Configuration method and configuration device for the backhaul link in a long term evolution system |
| WO2011003320A1 (en) * | 2009-07-08 | 2011-01-13 | 中兴通讯股份有限公司 | Method for sending pilots in wireless communication system, wireless communication system and wireless communication method |
| CN101754425B (en) * | 2008-12-12 | 2012-05-23 | 中兴通讯股份有限公司 | Method for avoiding misoperation of user equipment in LTE system |
| CN101784059B (en) * | 2009-01-15 | 2012-11-14 | 联芯科技有限公司 | Noise estimation method and device for MBSFN system |
| CN107453853A (en) * | 2016-05-31 | 2017-12-08 | 华为技术有限公司 | A kind of method and apparatus of pilot transmission |
-
2007
- 2007-04-10 CN CNA2007101005657A patent/CN101287146A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754425B (en) * | 2008-12-12 | 2012-05-23 | 中兴通讯股份有限公司 | Method for avoiding misoperation of user equipment in LTE system |
| CN101784059B (en) * | 2009-01-15 | 2012-11-14 | 联芯科技有限公司 | Noise estimation method and device for MBSFN system |
| WO2010108364A1 (en) * | 2009-03-23 | 2010-09-30 | 中兴通讯股份有限公司 | Configuration method and configuration device for the backhaul link in a long term evolution system |
| CN101848420B (en) * | 2009-03-23 | 2014-01-01 | 中兴通讯股份有限公司 | Collocation method and device of backhaul link in long term evolution system |
| WO2011003320A1 (en) * | 2009-07-08 | 2011-01-13 | 中兴通讯股份有限公司 | Method for sending pilots in wireless communication system, wireless communication system and wireless communication method |
| CN107453853A (en) * | 2016-05-31 | 2017-12-08 | 华为技术有限公司 | A kind of method and apparatus of pilot transmission |
| CN107453853B (en) * | 2016-05-31 | 2020-10-16 | 华为技术有限公司 | Method and device for pilot frequency transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8559295B2 (en) | Method and apparatus for pilot signal transmission | |
| CN1585394B (en) | Apparatus and method for assigning groups of subcarriers in an OFDM system | |
| US7460466B2 (en) | Apparatus and method for signal constitution for downlink of OFDMA-based cellular system | |
| CN102833818B (en) | Physical downlink control channel mapping method and transmitting-receiving apparatus | |
| CN101594336B (en) | Method for sending positioning reference signals | |
| JP3535344B2 (en) | Multicarrier transmission method, data transmission device, mobile station device, and base station device | |
| KR100899744B1 (en) | Apparatus and method for transmitting/receiving control channel message in mobile telecommunication system | |
| US20070189406A1 (en) | Method and apparatus for transmitting and receiving pilot symbols in orthogonal frequency-division multiplexing based communication systems | |
| CN101507221B (en) | A transmission method and apparatus for cancelling inter-carrier interference | |
| KR20100133918A (en) | Reference symbol stucture for dft spread ofdm system | |
| CN101155399A (en) | Device and method for control signal transmission in variable band width system | |
| US9106377B2 (en) | Method and device for sending and receiving a reference signal | |
| JP2004336746A (en) | Apparatus and method for estimating channel in orthogonal frequency division multiplexing system using multiplex antenna | |
| CN103107857A (en) | Sending method and sending device for improving physical downlink control channel | |
| CN108540271A (en) | A kind of Alamouti transmission methods, wireless communication system suitable for FBMC/OQAM | |
| CN101009527B (en) | An implementation method for uplink pilot frequency insertion and data reuse | |
| CN101287146A (en) | Pilot sending and receiving method and device for special carrier | |
| JP4138280B2 (en) | OFDM communication device | |
| JPH11205205A (en) | Multi-carrier signal transmitter | |
| CN101286812A (en) | Pilot receiving and transmitting method and device in mixed carrier | |
| CN101090384A (en) | Subband dispatching method and device | |
| Khare et al. | Effect of Doppler frequency and ber in FFT based OFDM system with Rayleigh fading channel | |
| CN113286355B (en) | Power distribution method based on OTFS-NOMA (optical transport plane-non-uniform multiple access) cross-domain transmission system | |
| US20050007946A1 (en) | Multi-carrier transmission | |
| Ahmed et al. | A study on the performance metrics of the universal filtered multi carrier waveforms for 5G |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081015 |