CN102088425A - Method, apparatus and system for channel estimation and pilot insertion in MIMO system - Google Patents

Method, apparatus and system for channel estimation and pilot insertion in MIMO system Download PDF

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CN102088425A
CN102088425A CN2011100031383A CN201110003138A CN102088425A CN 102088425 A CN102088425 A CN 102088425A CN 2011100031383 A CN2011100031383 A CN 2011100031383A CN 201110003138 A CN201110003138 A CN 201110003138A CN 102088425 A CN102088425 A CN 102088425A
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carrier
pilot sub
symbol
integral multiple
symbols
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马晨
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2011/072974 priority patent/WO2012119337A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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Abstract

The present invention discloses a method, an apparatus and a system for channel estimation and pilot insertion in an MIMO system, wherein the method comprises the steps of: determining whether the number of the symbols in an MIMO area of a receiving end is integral multiple of 4; respectively extracting the pilot subcarriers from the symbol portion which is integral multiple of 4 and the remaining symbol portion which is non-integral multiple of 4, to perform the channel estimation; in a transmitting terminal, correspondingly determining whether the number of the symbols in an MIMO area of the transmitting terminal is integral multiple of 4; and respectively inserting pilot subcarriers into the symbol portion which is integral multiple of 4 and the remaining symbol portion which is non-integral multiple of 4. The method for channel estimation and pilot insertion of the invention can flexibly realize the pilot subcarrier insertion and channel estimation by using the pilot subcarriers when the downlink MIMO system area is configured with any quantity of symbols, thereby overcoming the restriction on the channel estimation from the number of symbols, enhancing the flexibility of the frame configuration in a downlink MIMO system, and increasing the utilization rate of the subcarriers.

Description

The methods, devices and systems of channel estimating and insertion pilot tone in the mimo system
Technical field
The present invention designs wireless communication field, relates in particular to channel estimating in wireless multiple-input and multiple-output (MIMO, the MultipleInput Multiple Output) communication system and inserts the methods, devices and systems of pilot tone.
Background technology
In wireless communication system, because the propagation path between the transmitter and receiver is very complicated, the transmission quality of signal on wireless channel can be affected, wireless channel is fixing unlike wire message way in addition also can predict, but has very big randomness, often cause amplitude, phase place and the frequency distortion of received signal, influence the performance of wireless communication system, therefore channel estimating seems particularly important in wireless communication system.Channel estimating can be defined as physical channel carries out feasibility study to the influence of input signal the process of describing.
In order to guarantee the accuracy of signal transmission in the wireless communication system, usually adopting many transmit antennas and Duo Gen reception antenna is that mimo system transmits data, form many mimo channels,, need to obtain every mimo channel and carry out channel estimating for distinguishing different users and elevator system performance.Usually the down channel estimation approach is to insert pilot sub-carrier in down link, and resulting reception is worth the channel response of estimating whole link to receiving terminal according to the relevant position pilot sub-carrier.
Regulation according to the IEEE802.16 agreement, adopt the descending OFDM (OFDM of mimo system, Orthogonal Frequency Division Multiplexing) in the system, the minimal processing unit of carrying information is defined as a cluster, each cluster is made up of two symbols and a frequency, and the structure of the every frequency of every symbol is 2 pilot sub-carriers and 12 data subcarriers, and per two symbols form a circulation.As shown in Figure 1, the position of establishing 14 subcarriers from left to right be expressed as successively [6 ,-5 ,-4 ... 5,6,7], wherein, open circles representative data subcarrier, hollow triangle is represented pilot sub-carrier, the subcarrier of the first behavior even number symbols, and the pilot sub-carrier position is [2,2]; The subcarrier of the second behavior base figure symbol, pilot sub-carrier position are [6,6].The channel estimating of downlink data subcarrier is to utilize 4 pilot sub-carriers among the identical cluster in 2 symbol positions on frequency to carry out linear fit to realize, correspondingly, need extract this 4 pilot sub-carriers at transmitting terminal from 2 symbols.Because in mimo system, in order to distinguish different transmitting antennas, the pilot sub-carrier of comparing every antenna with the structure of non-mimo system all will reduce by half, mimo system commonly used at present adopts two transmit antennas, stipulate according to agreement, channel estimating is to need 4 pilot sub-carriers to carry out linear fit to realize, correspondingly, also need to extract 4 pilot sub-carriers at transmitting terminal, therefore the channel estimating in the mimo system of two transmit antennas is that a circulation realizes with four symbolic numbers.As shown in Figure 2, wherein, circular representative data subcarrier, hollow triangle are represented first pilot sub-carrier on the antenna, and solid triangle is represented second pilot sub-carrier on the antenna.In four adjacent-symbols, find 2 cluster of same position frequency, extract 4 pilot sub-carriers, and then carry out channel estimating from same transmit antennas.In this mimo system, because 4 symbols of definite needs of channel estimation value are realized, make the proportioning of entire system frame receive restriction, that is to say, regional symbolic number in the mimo system is only the active data zone when being 4 multiple, when MIMO zone symbolic number is not 4 integral multiple, can cause subcarrier to make full use of, if in the unnecessary symbol that goes out, adopt the method for simple average to carry out channel estimating then can cause the error rate to improve.
Summary of the invention
In view of this, it is a kind of in descending mimo system that main purpose of the present invention is to provide, MIMO zone symbolic number is under 4 the non-integral multiple situation, can effectively use Zone Full symbol extraction pilot sub-carrier and utilize pilot sub-carrier to carry out the methods, devices and systems of channel estimating.
For achieving the above object, technical scheme of the present invention is achieved in that
The method of channel estimating in a kind of mimo system, this method comprise, whether the symbol quantity of determining receiving terminal MIMO zone is 4 integral multiple;
The symbolic component of integral multiple to 4, per 4 symbols are a circulation, extract the pilot sub-carrier of each symbol in each circulation respectively, extract 4 pilot sub-carriers altogether and are used for determining channel estimation value;
To remaining the symbolic component of non-4 integral multiple, extract the pilot sub-carrier of n symbol of residue and replenish 4 pilot sub-carriers of 4-n pilot sub-carrier formation that lack and be used for definite channel estimation value, wherein, n is the symbol numbers of remaining non-4 integral multiple.
Further, described method of replenishing the pilot sub-carrier that lacks is: to a described remaining n symbol, extract n pilot sub-carrier of transmitting antenna, determine that the pilot sub-carrier number that lacks is 4-n, the described 4-n that a lacks pilot sub-carrier is found in pilot sub-carrier position in 4 adjacent-symbols of described n symbol front, adds in the described n pilot sub-carrier to form 4 pilot sub-carriers and be used for determining described channel estimation value.
Further, the described concrete grammar that replenishes the pilot sub-carrier that lacks comprises:
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 1, then replenishes the pilot sub-carrier of back 3 symbols of 4 symbols noted earlier;
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 2, then replenishes the pilot sub-carrier of back 2 symbols of 4 symbols noted earlier;
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 3, then replenishes the pilot sub-carrier of back 1 symbol of 4 symbols noted earlier.
Further, the described concrete grammar that replenishes the pilot sub-carrier that lacks also comprises:
The pilot sub-carrier order of 4 adjacent-symbols of the order of 4 pilot sub-carriers forming after replenishing and n symbol front of described residue is identical.
Further, the method for described definite channel estimation value is:
Utilize 4 pilot sub-carriers that directly extract or replenish 4 the determined pilot sub-carrier value of pilot sub-carrier calculating channel estimated values forming, concrete computational methods are:
H ^ ( k ) = k { 1 40 [ - 3 H ^ p ( 2 ) - H ^ p ( 0 ) + H ^ p ( 1 ) + 3 H ^ p ( 3 ) ] }
+ { 1 4 [ H ^ p ( 2 ) + H ^ p ( 0 ) + H ^ p ( 1 ) + H ^ p ( 3 ) ] }
Wherein
Figure BSA00000412720500033
Refer to 4 pilot sub-carrier values, i=[0,1,2,3].
For achieving the above object, the present invention also provides the method for inserting pilot sub-carrier in a kind of mimo system, and this method comprises, whether the symbol quantity of determining transmitting terminal MIMO zone is 4 integral multiple;
The symbolic component of integral multiple for 4, per 4 symbols are a circulation, 4 symbols that are respectively in each circulation insert 4 pilot sub-carriers;
To remaining the symbolic component of non-4 integral multiple, insert the position of pilot sub-carrier according to 4 adjacent-symbols in front and insert pilot sub-carrier successively;
Further, described pilot sub-carrier is used for carrying out channel estimating at receiving terminal.
The device of channel estimating in a kind of mimo system comprises receiving terminal symbolic number determination module, pilot sub-carrier extraction module, pilot sub-carrier complementary module and channel estimation value determination module; Wherein,
Receiving terminal symbolic number determination module is used for determining the symbolic number feature in receiving terminal MIMO zone;
The pilot sub-carrier extraction module is used for extracting the pilot sub-carrier of described MIMO zone symbols transmitting antenna;
The pilot sub-carrier complementary module is used to described residue symbols to replenish the pilot sub-carrier that lacks;
The channel estimation value determination module is used for carrying out channel estimating according to described pilot sub-carrier value.
Further, described receiving terminal symbolic number determination module is used for the symbol in described MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and to notify described pilot sub-carrier extraction module be the symbol extraction pilot sub-carrier of described 4 integral multiple part, be the symbol extraction pilot sub-carrier of described non-4 integral multiple part, and to notify described pilot sub-carrier complementary module be that the symbol of described non-4 integral multiple part replenishes the described pilot sub-carrier that lacks.
Further, described pilot sub-carrier extraction module is used for extracting the pilot sub-carrier of the symbol transmitting antenna of described 4 integral multiple part, or extract the pilot sub-carrier of transmitting antenna in the symbol of described non-4 integral multiple part, and will be the described pilot sub-carrier complementary module of result notification of the symbol extraction pilot sub-carrier of described non-4 integral multiple part.
Further, described pilot sub-carrier complementary module is used for the result for described non-4 integral multiple symbol extraction pilot sub-carrier partly according to described pilot sub-carrier extraction module notice, determine the pilot sub-carrier number that lacks, the described pilot sub-carrier that lacks is found in the relevant position of 4 adjacent-symbols in front, is the additional pilot sub-carrier of the symbol of described non-4 integral multiple part.
Further, described channel estimation value determination module is used for extracting according to the pilot sub-carrier extraction module or pilot sub-carrier complementary module is replenished complete pilot sub-carrier value, and the calculating channel estimated value is finished the channel estimating of receiving terminal.
Insert the device of pilot tone in a kind of mimo system, comprise transmitting terminal symbolic number determination module and pilot sub-carrier insert module; Wherein,
Transmitting terminal symbolic number determination module is used for determining the symbolic number feature in transmitting terminal MIMO zone;
The pilot sub-carrier insert module is used for inserting pilot tone in the transmitting terminal respective symbol.
Further, described transmitting terminal symbolic number determination module is used for determining that whether the symbolic number in transmitting terminal MIMO zone is 4 integral multiple, the symbol in described MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and notify described pilot sub-carrier insert module to be respectively two parts symbol and insert pilot sub-carrier.
Further, described pilot sub-carrier insert module is used to the symbol in described MIMO zone to insert pilot sub-carrier:
The symbolic component of integral multiple, per 4 symbols for described 4 be one group for each symbol inserts pilot sub-carrier, insert 4 pilot sub-carriers altogether;
To described remaining non-4 integral multiple symbolic component, insert the method for pilot sub-carrier according to 4 adjacent-symbols in front and insert pilot sub-carrier.
A kind of mimo system comprises the device of each described insertion pilot sub-carrier of claim 7-14 and the device of channel estimating at least; The device of described insertion pilot sub-carrier, be used to the symbol in transmitting terminal MIMO zone to insert pilot sub-carrier, after the symbol of insertion pilot sub-carrier sends to receiving terminal, described channel estimating apparatus extracts the pilot sub-carrier of respective symbol in the MIMO zone to determine channel estimation value, realizes channel estimating.
From scheme provided by the invention as seen, in mimo system, can be at the symbol of descending mimo system area configurations any amount, under the configuration of any symbolic number, can realize the pilot sub-carrier insertion flexibly and utilize pilot sub-carrier to carry out channel estimating, overcome the restriction of symbolic number to channel estimating, strengthen frame configuration flexibility in the descending mimo system, improved the subcarrier utilance.By the emulation contrast, carry out the channel estimation accuracy height by scheme provided by the invention, and can not cause that systematic function descends.
Description of drawings
Fig. 1 is the structural representation of downlink frame in the non-mimo system;
Fig. 2 is the structural representation of downlink frame in the mimo system;
Fig. 3 carries out the method flow diagram of channel estimating for receiving terminal among the present invention;
Fig. 4 inserts the method flow diagram of pilot sub-carrier for transmitting terminal among the present invention;
Fig. 5 is an embodiment schematic diagram that replenishes pilot sub-carrier according to the inventive method in the mimo system downlink frame;
Fig. 6 carries out the device schematic diagram of channel estimating for receiving terminal among the present invention;
Fig. 7 inserts the device schematic diagram of pilot sub-carrier for transmitting terminal among the present invention.
Embodiment
In mimo system, requirement according to the IEEE802.16 agreement, the cycle of downlink frame is very short, the time interval between the adjacent-symbol is very little, therefore can in downlink frame, use the channel estimation value of adjacent-symbol under the same frequency to be similar to the channel estimating that replaces this symbol, because what use is that the channel estimating between distinct symbols is done mutual being similar under the same frequency, so the frequency selective fading of channel can not influence the performance of this approximation method.Correspondingly, before carrying out channel estimating, transmitting terminal is that the symbol insertion pilot sub-carrier in MIMO zone is used to carry out channel estimating.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 3 is the method flow diagram that receiving terminal carries out channel estimating among the present invention, as shown in Figure 3, comprising:
Step 300: receiving terminal carries out subcarrier and separates mapping.
Whether step 301: determining the symbolic number in MIMO zone, in this step, need to determine the symbol quantity in MIMO zone, is that 4 integral multiple carries out different disposal according to the symbolic number in MIMO zone; When symbolic number is 4 integral multiple, carry out step 302; When symbolic number be 4 non-integral multiple the time, carry out step 303.
Step 302: according to the judgement of step 301, when the symbolic number in MIMO zone is 4 integral multiple, extracts pilot sub-carrier according to circulation of 4 symbols and carry out channel estimating, in this step, determine that specifically the method for channel estimation value is:
Receiving terminal is worth the channel response of estimating whole link according to resulting reception insert pilot sub-carrier in down link after, particularly, supposes among the cluster
Figure BSA00000412720500061
Be the channel frequency response at subcarrier k place, wherein-6≤k≤7.P is the position of all pilot sub-carriers among the cluster.If P=[-6 ,-2,2,6].By the method for linear fit, each position data subcarrier channel estimation should be:
H ^ ( k ) = k { 1 40 [ - 3 H ^ p ( 2 ) - H ^ p ( 0 ) + H ^ p ( 1 ) + 3 H ^ p ( 3 ) ] }
+ { 1 4 [ H ^ p ( 2 ) + H ^ p ( 0 ) + H ^ p ( 1 ) + H ^ p ( 3 ) ] }
Wherein Be meant the estimated value that 4 pilot sub-carriers obtain, i=[0,1,2,3].
Step 303: according to the judgement of step 301, when the symbolic number in MIMO zone be 4 non-integral multiple the time, then the symbolic component of 4 integral multiple is that a circulation extraction pilot sub-carrier carries out channel estimating according to 4 symbols, concrete channel estimation methods is identical with channel estimation methods in the step 302, and remaining 4 non-integral multiple symbol carries out the processing of step 304.
Step 304: the symbolic number of determining the MIMO zone is removed the several symbols of back residue by 4, carries out the processing of step 305 according to the number difference of residue symbol.The symbolic number that lacks is replenished the pilot sub-carrier that lacks,
Step 305: according to the residue number of symbols of determining in the step 304, replenish the pilot sub-carrier that lacks, in this step, specifically comprise following several situation:
(1) symbolic number that has more after being removed by 4 of the symbolic number in MIMO zone is 1, then replenishes the pilot sub-carrier of back 3 symbols of 4 adjacent-symbols in front, and additional position is identical with the position of the pilot sub-carrier of front 4 symbols;
(2) symbolic number that has more after being removed by 4 of the symbolic number in MIMO zone is 2, then replenishes the pilot sub-carrier of back 2 symbols of 4 adjacent-symbols in front, and additional position is identical with the position of the pilot sub-carrier of front 4 symbols;
(3) symbolic number that has more after being removed by 4 of the symbolic number in MIMO zone is 3, then replenishes the pilot sub-carrier of back 1 symbol of 4 adjacent-symbols in front, and additional position is identical with the position of the pilot sub-carrier of front 4 symbols.
Step 306: utilize 4 pilot sub-carriers to determine channel estimation value, concrete channel estimation methods is identical with channel estimation methods in the step 302.
Step 307: merge the multi-antenna channel estimated value, finish the channel estimating of receiving terminal in the mimo system.
Fig. 4 is the method flow diagram of transmitting terminal insertion pilot sub-carrier among the present invention, as shown in Figure 4, comprising:
Step 400: subcarrier mapping in this step, is mapped to the code signal of transmitting terminal in the mimo system on the subcarrier of corresponding multi-carrier modulation.
Whether step 401: determining the symbolic number in MIMO zone, in this step, need to determine the symbol quantity in MIMO zone, is that 4 integral multiple carries out different disposal according to the symbol quantity in MIMO zone; When symbol quantity is 4 integral multiple, carry out step 402; When symbol quantity be 4 non-integral multiple the time, carry out step 403.
Step 402: according to the judgement of step 401, when the symbolic number in MIMO zone was 4 integral multiple, per 4 symbols were that 4 pilot sub-carriers are inserted in a circulation.
Step 403: according to the judgement of step 401, when the symbolic number in MIMO zone be 4 non-integral multiple the time, then the symbolic component of 4 integral multiple is that 4 pilot sub-carriers are inserted in a circulation according to 4 symbols, and the integral multiple symbolic component to remaining non-4 carries out the processing of step 404.
Step 404: the integral multiple symbolic component for remaining non-4 inserts pilot sub-carrier successively, and in this step, the method for inserting pilot sub-carrier is:
According to the position that 4 adjacent-symbols in front insert pilot sub-carrier, be followed successively by the residue symbol described in this step and insert pilot sub-carrier.
Step 405:IFFT, this step is carried out the signal modulation by Fourier transform after inserting pilot sub-carrier, be not used in qualification the present invention.
Fig. 5 is an embodiment schematic diagram that replenishes pilot sub-carrier according to the inventive method in the mimo system downlink frame, as shown in Figure 5, each row is represented the structure of a symbol, circular representative data subcarrier, hollow triangle is represented first pilot sub-carrier on the antenna, and solid triangle is represented second pilot sub-carrier on the antenna.Have 6 symbols in the present embodiment, symbolic number be 4 non-integral multiple, if first symbolic number that walks to the 6th row is followed successively by 4K, 4K+1,4K+2,4K+3,4K+4 and 4K+5, channel estimating approximation method according to the inventive method, 4K, 4K+1,4K+2,4K+3 symbol constitutes complete 4 a symbols circulation, directly extract corresponding pilot sub-carrier and carry out channel estimating, for 4K+4 and 4K+5 symbol, after extracting the pilot sub-carrier of respective transmit antenna, with 4K+2,4K+3 symbol adds to the back to pilot sub-carrier, form 4 pilot sub-carriers, carry out channel estimating.In concrete the enforcement, owing to channel estimating is mainly calculated by the pilot sub-carrier value, thus can directly extract the pilot sub-carrier of each symbol, and needn't supplementary data subcarrier part.As shown in Figure 5, for 4K+4 and 4K+5 symbol, 4 pilot sub-carriers that can directly extract the arrow indication carry out channel estimating.
Fig. 6 carries out the device schematic diagram of channel estimating for receiving terminal among the present invention, and as shown in Figure 6, the device that receiving terminal carries out channel estimating among the present invention comprises at least:
Receiving terminal symbolic number determination module 600 is used for determining the symbolic number feature in receiving terminal MIMO zone;
This module specifically is used for the symbol in MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and notice pilot sub-carrier extraction module is described 4 integral multiple symbol extraction pilot sub-carrier partly, the symbol extraction pilot sub-carrier of integral multiple part for non-4, and notice pilot sub-carrier complementary module is non-4 the additional pilot sub-carrier that lacks of integral multiple symbol partly.
Pilot sub-carrier extraction module 601 is used for extracting the pilot sub-carrier of described MIMO zone symbols transmitting antenna;
This module specifically is used for extracting the pilot sub-carrier of the symbol transmitting antenna of 4 integral multiple part, or extract the pilot sub-carrier of transmitting antenna in the symbol of non-4 integral multiple part, and will be the result notification pilot sub-carrier complementary module of the symbol extraction pilot sub-carrier of non-4 integral multiple part.
Pilot sub-carrier complementary module 602 is used to described residue symbols to replenish the pilot sub-carrier that lacks;
This module specifically is used for the result for the symbol extraction pilot sub-carrier of non-4 integral multiple part according to pilot sub-carrier extraction module notice, determine the pilot sub-carrier number that lacks, the pilot sub-carrier that lacks is found in the relevant position of 4 adjacent-symbols in front, and the symbol of the integral multiple part for non-4 replenishes pilot sub-carrier.
Channel estimation value determination module 603 is used for carrying out channel estimating according to described pilot sub-carrier value;
This module specifically is used for extracting according to the pilot sub-carrier extraction module or pilot sub-carrier complementary module is replenished complete pilot sub-carrier value, and the calculating channel estimated value is finished the channel estimating of receiving terminal.
Fig. 7 is the device schematic diagram of transmitting terminal insertion pilot sub-carrier among the present invention, and as shown in Figure 7, the device of transmitting terminal insertion pilot sub-carrier comprises at least among the present invention:
Transmitting terminal symbolic number determination module 700 is used for determining the symbolic number feature in transmitting terminal MIMO zone;
This module is used for specifically determining that whether the symbolic number in transmitting terminal MIMO zone is 4 integral multiple, the symbol in described MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and notify described pilot sub-carrier insert module to be respectively two parts symbol and insert pilot sub-carrier.
Pilot sub-carrier insert module 701 is used for inserting pilot tone in the transmitting terminal respective symbol;
This module specifically is used to the symbol in described MIMO zone to insert pilot sub-carrier:
The symbolic component of integral multiple, per 4 symbols for 4 be one group for each symbol inserts pilot sub-carrier, insert 4 pilot sub-carriers altogether;
Integral multiple symbolic component to remaining non-4 inserts the method for pilot sub-carrier and inserts pilot sub-carrier according to 4 adjacent-symbols in front.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (15)

1. the method for channel estimating in the mimo system is characterized in that, whether the symbol quantity of determining receiving terminal MIMO zone is 4 integral multiple;
The symbolic component of integral multiple to 4, per 4 symbols are a circulation, extract the pilot sub-carrier of each symbol in each circulation respectively, extract 4 pilot sub-carriers altogether and are used for determining channel estimation value;
To remaining the symbolic component of non-4 integral multiple, extract the pilot sub-carrier of n symbol of residue and replenish 4 pilot sub-carriers of 4-n pilot sub-carrier formation that lack and be used for definite channel estimation value, wherein, n is the symbol numbers of remaining non-4 integral multiple.
2. the method for channel estimating according to claim 1, it is characterized in that, described method of replenishing the pilot sub-carrier that lacks is: to a described remaining n symbol, extract n pilot sub-carrier of transmitting antenna, determine that the pilot sub-carrier number that lacks is 4-n, the described 4-n that a lacks pilot sub-carrier is found in pilot sub-carrier position in 4 adjacent-symbols of described n symbol front, adds in the described n pilot sub-carrier to form 4 pilot sub-carriers and be used for determining described channel estimation value.
3. the method for channel estimating according to claim 2 is characterized in that, the described concrete grammar that replenishes the pilot sub-carrier that lacks comprises:
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 1, then replenishes the pilot sub-carrier of back 3 symbols of 4 symbols noted earlier;
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 2, then replenishes the pilot sub-carrier of back 2 symbols of 4 symbols noted earlier;
The symbolic number that the symbolic number in described MIMO zone has more after being removed by 4 is 3, then replenishes the pilot sub-carrier of back 1 symbol of 4 symbols noted earlier.
4. according to the method for claim 2 or 3 described channel estimating, it is characterized in that the described concrete grammar that replenishes the pilot sub-carrier that lacks also comprises:
The pilot sub-carrier order of 4 adjacent-symbols of the order of 4 pilot sub-carriers forming after replenishing and n symbol front of described residue is identical.
5. the method for channel estimating according to claim 1 is characterized in that, the method for described definite channel estimation value is:
Utilize 4 pilot sub-carriers that directly extract or replenish 4 the determined pilot sub-carrier value of pilot sub-carrier calculating channel estimated values forming, concrete computational methods are:
H ^ ( k ) = k { 1 40 [ - 3 H ^ p ( 2 ) - H ^ p ( 0 ) + H ^ p ( 1 ) + 3 H ^ p ( 3 ) ] }
+ { 1 4 [ H ^ p ( 2 ) + H ^ p ( 0 ) + H ^ p ( 1 ) + H ^ p ( 3 ) ] }
Wherein Refer to 4 pilot sub-carrier values, i=[0,1,2,3].
6. insert the method for pilot sub-carrier in the mimo system, it is characterized in that, whether the symbol quantity of determining transmitting terminal MIMO zone is 4 integral multiple;
The symbolic component of integral multiple for 4, per 4 symbols are a circulation, 4 symbols that are respectively in each circulation insert 4 pilot sub-carriers;
To remaining the symbolic component of non-4 integral multiple, insert the position of pilot sub-carrier according to 4 adjacent-symbols in front and insert pilot sub-carrier successively;
Described pilot sub-carrier is used for carrying out channel estimating at receiving terminal.
7. the device of channel estimating in the mimo system is characterized in that, comprises receiving terminal symbolic number determination module, pilot sub-carrier extraction module, pilot sub-carrier complementary module and channel estimation value determination module; Wherein,
Receiving terminal symbolic number determination module is used for determining the symbolic number feature in receiving terminal MIMO zone;
The pilot sub-carrier extraction module is used for extracting the pilot sub-carrier of described MIMO zone symbols transmitting antenna;
The pilot sub-carrier complementary module is used to described residue symbols to replenish the pilot sub-carrier that lacks;
The channel estimation value determination module is used for carrying out channel estimating according to described pilot sub-carrier value.
8. the device of channel estimating according to claim 7, it is characterized in that, described receiving terminal symbolic number determination module is used for the symbol in described MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and to notify described pilot sub-carrier extraction module be the symbol extraction pilot sub-carrier of described 4 integral multiple part, be the symbol extraction pilot sub-carrier of described non-4 integral multiple part, and to notify described pilot sub-carrier complementary module be that the symbol of described non-4 integral multiple part replenishes the described pilot sub-carrier that lacks.
9. the device of channel estimating according to claim 7, it is characterized in that, described pilot sub-carrier extraction module is used for extracting the pilot sub-carrier of the symbol transmitting antenna of described 4 integral multiple part, or extract the pilot sub-carrier of transmitting antenna in the symbol of described non-4 integral multiple part, and will be the described pilot sub-carrier complementary module of result notification of the symbol extraction pilot sub-carrier of described non-4 integral multiple part.
10. the device of channel estimating according to claim 7, it is characterized in that, described pilot sub-carrier complementary module is used for the result for described non-4 integral multiple symbol extraction pilot sub-carrier partly according to described pilot sub-carrier extraction module notice, determine the pilot sub-carrier number that lacks, the described pilot sub-carrier that lacks is found in the relevant position of 4 adjacent-symbols in front, is the additional pilot sub-carrier of the symbol of described non-4 integral multiple part.
11. the device of channel estimating according to claim 7, it is characterized in that, described channel estimation value determination module is used for extracting according to the pilot sub-carrier extraction module or pilot sub-carrier complementary module is replenished complete pilot sub-carrier value, the calculating channel estimated value is finished the channel estimating of receiving terminal.
12. insert the device of pilot tone in the mimo system, it is characterized in that, comprise transmitting terminal symbolic number determination module and pilot sub-carrier insert module; Wherein,
Transmitting terminal symbolic number determination module is used for determining the symbolic number feature in transmitting terminal MIMO zone;
The pilot sub-carrier insert module is used for inserting pilot tone in the transmitting terminal respective symbol.
13. the device of insertion pilot tone according to claim 12, it is characterized in that, described transmitting terminal symbolic number determination module is used for determining that whether the symbolic number in transmitting terminal MIMO zone is 4 integral multiple, the symbol in described MIMO zone is divided into 4 integral multiple and integral multiple two parts of non-4 according to its quantity, and notify described pilot sub-carrier insert module to be respectively two parts symbol and insert pilot sub-carrier.
14. the device of insertion pilot tone according to claim 12 is characterized in that, described pilot sub-carrier insert module is used to the symbol in described MIMO zone to insert pilot sub-carrier:
The symbolic component of integral multiple, per 4 symbols for described 4 be one group for each symbol inserts pilot sub-carrier, insert 4 pilot sub-carriers altogether;
To described remaining non-4 integral multiple symbolic component, insert the method for pilot sub-carrier according to 4 adjacent-symbols in front and insert pilot sub-carrier.
15. a mimo system is characterized in that, comprises the device of each described insertion pilot sub-carrier of claim 7-14 and the device of channel estimating at least; The device of described insertion pilot sub-carrier, be used to the symbol in transmitting terminal MIMO zone to insert pilot sub-carrier, after the symbol of insertion pilot sub-carrier sends to receiving terminal, described channel estimating apparatus extracts the pilot sub-carrier of respective symbol in the MIMO zone to determine channel estimation value, realizes channel estimating.
CN2011100031383A 2011-03-08 2011-03-08 Method, apparatus and system for channel estimation and pilot insertion in MIMO system Pending CN102088425A (en)

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