CN102075948B - Method and system for transmitting reference signs under generalized cell system structure - Google Patents

Method and system for transmitting reference signs under generalized cell system structure Download PDF

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Publication number
CN102075948B
CN102075948B CN 201010546232 CN201010546232A CN102075948B CN 102075948 B CN102075948 B CN 102075948B CN 201010546232 CN201010546232 CN 201010546232 CN 201010546232 A CN201010546232 A CN 201010546232A CN 102075948 B CN102075948 B CN 102075948B
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code
reference symbol
pilot
cazac
residential quarters
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CN102075948A (en
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康桂霞
张平
陈秀鹏
张文璇
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Abstract

The invention discloses a method and a system for transmitting reference signs under a generalized cell system structure. The generalized cell system structure comprises at least one generalized cell mobile communication network; and the generalized cell comprises at least two cells which occupy same frequency band resources. The method comprises the following steps that: the reference signs are transmitted to one or more receiving equipment from different antennas of the at least two cells; the data frames emitted from the different antennas of the at least two cells employ different reference signs based on constant amplitude zero autocorrelation codes (CAZAC); a difference value M' between code seeds Mi used by every two CAZAC codes having the same code length and the code length NF of the CAZAC codes are even, and M'/cof and NF/cof are odd, wherein i is a natural number, and cof is a common factor. By transmitting the reference signs planed and set by the system and the method, intercell signal interference can be restrained effectively, so the system capacity can be increased.

Description

The method and system of transmission reference symbol under the architecture of many residential quarters
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method and system of under the architecture of many residential quarters, transmitting reference symbol.
Background technology
In recent years, along with the continuous growth of mobile user data business demand, wireless communication system is just experiencing from backward three generations's (B3G) development of the third generation (3G).Current, in the commercialization and the marketization that mobile communication carrier and the equipment manufacturers of countries in the world are actively promoting 3G (Third Generation) Moblie, the research and development of the B3G mobile communication system of high speed business also launch for having more high spectrum utilization and providing more for every industry or trade, university and other scientific research institution.
For the maximum using frequency spectrum resource and obtain higher investment return, the B3G mobile communication system will have than system in the past higher spectrum efficiency to support the more business of high data rate (more than 100Mb/s).In addition, mobile communication system operator is desirably on the limited bandwidth resources and supports simultaneously more user with acceptable service quality (QoS).Therefore, system designer just must be in the face of the challenge of higher power system capacity.
For traditional Cellular Networks, generally adopt the method for cell splitting to enlarge power system capacity.After cell size reduces, switch and the presence of intercell interference increase burden of system signaling.In order to improve power system capacity, promote the user and experience, become a focus of future broadband wireless communication systems architectural study based on the architecture of many residential quarters.Many residential quarters architecture is comprised of a plurality of adjacent residential quarter of using the same frequency band resource, and its basic thought is that antenna is distributed in each hot zones in the residential quarter; The spaced antenna that system will select and each portable terminal is nearest communicates.Facing mutually the residential quarter uses identical running time-frequency resource and the portable terminal in its coverage to communicate.
The planning of reference symbol and design utilization are major issues in the B3G wireless communication system design.Reference symbol is widely used in channel estimating, processing and the process such as synchronous.In channel estimating, each user is assigned with different reference symbol (such as pilot code), is used for receiving terminal and unites the channel information of estimating a plurality of users; In synchronizing process, each portable terminal is assigned with different reference symbol (such as synchronous code), is used for the initial connecting system of mobile subscriber and/or obtains accurate timing/frequency deviation estimating.In above-mentioned reference symbol is used, all need reference symbol is effectively put in order, in order to be reduced in interference between multi-user in estimating to process, and in access procedure, improve the system access probability.
In the mobile communication system in future, adopt some advanced signal processing technologies can suppress and eliminate interference in the residential quarter.For example, in multicarrier system, transmission is disturbed for the multi-user data signal, can adopt the frequency division multiple access technology based on OFDM to be suppressed; Transmission is disturbed for the multi-user pilot signal, can adopt the allied signal treatment technology, is suppressed such as the joint channel estimation technology.Therefore, the interference problem of inside, residential quarter can effectively be solved by advanced person's signal processing technology and code design.
Reference symbol design in the at present domestic and international wireless communication system has only related to the reference symbol design under single residential quarter mostly.As: the publication number that Nokia proposes is WO02/43277A1, denomination of invention is the PCT international application of " Method for transmitting information in a communication system, a communication and a wireless communication device "; The US Patent No. 6,208 that Germany Thomson-Brandt Co., Ltd proposes, 695B1, denomination of invention is " Method for reception of multicarrier signals and related apparatus "; The publication number that Raze Technologies company proposes is WO02/058271A2, and denomination of invention is the PCT international application of " Wireless communication system using block filtering and fast equalization-demodulation and method of operation " etc.Still lack systematic research for the reference symbol of under the architecture of many residential quarters, transmitting, not yet provide effective technical scheme.Because identical band resource is used in some residential quarters of the inside of residential quarter architecture more than, has just brought new challenge for the design of reference symbol.
Fig. 1 shows the reference signal application scenarios schematic diagram under the architecture of many residential quarters.As shown in Figure 1, these many residential quarters (Generalized Cell) system is by three cell set, one of them is reference cell (Reference cell), two is interfered cell (Interfering cell1, Interfering cell2), identical frequency resource, portable terminal (MT are used in all residential quarters, INT1, INT2) be positioned at the edge of three residential quarters.When cell load is larger, just may exist simultaneously the portable terminal that uses same frequency resource block, if reference symbol designs badly, will cause multiple access to disturb to reference cell.For reference cell, all signals from the portable terminal (INT1, INT2) of neighbor cell are interference source.
This shows, under the architecture of many residential quarters, the portable terminal that is in (namely being in cell edge) in a plurality of (more than two) cell coverage area simultaneously with a plurality of (such as two) residential quarter in a plurality of spaced antennas communicate, thereby a plurality of mobile subscribers in this a plurality of (such as two) residential quarter are caused interference.In future mobile communication system, the principal element that the restriction system capacity promotes is the interference of minizone.
In sum, how to design and utilize reference symbol in future under the architecture of many residential quarters, so that overcome well the interference of minizone by " the multi-plot joint optimization " of transmission reference symbol, become the technical problem that this area needs to be resolved hurrily.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method and system of transmitting reference symbol under the architecture of many residential quarters, reference symbol by transmission setting that the present invention plans, the establishment inter-cell signal interference, thus be conducive to improve power system capacity.
One aspect of the present invention provides a kind of method of transmitting reference symbol under the architecture of many residential quarters, the method comprises: many residential quarters architecture comprises at least one many community mobile communications net, and many residential quarters comprise at least two residential quarters that take the same frequency band resource; The method comprises: reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters; The Frame of launching on the different antennae of at least two residential quarters adopts the different reference symbols based on normal amplitude zero auto-correlation code CAZAC code; The code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and this CAZAC code FBe even number, and M '/cof and N F/ cof is odd number; Wherein, i is natural number, and cof is common factor.
Provided by the invention under the architecture of many residential quarters among the embodiment of method of transmission reference symbol, the code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and CAZAC code FBe even number, M '/cof and N F/ cof is not odd number entirely, and common factor cof is as far as possible little.
Provided by the invention under the architecture of many residential quarters among the embodiment of method of transmission reference symbol, the CAZAC code is the Chu sequence, namely
c M ( n ) = e j Mπn ( n + mod ( N F , 2 ) ) N F , n = 0 . . . N F - 1 ,
Wherein, M is the seed of CAZAC code, N FBe the code length of CAZAC code, for same CAZAC code, M and N FRelatively prime.
Provided by the invention under the architecture of many residential quarters among the embodiment of method of transmission reference symbol, receiving equipment receives the signal from the Wireless Telecom Equipment of at least one residential quarter, and the signal that the Wireless Telecom Equipment of other residential quarter sends causes interference to the Wireless Telecom Equipment signal of this residential quarter.
Provided by the invention under the architecture of many residential quarters among the embodiment of method of transmission reference symbol, user data transmits at Frame, and with reference symbol multiplex system resource.
Another aspect of the present invention provides a kind of method of transmitting reference symbol under the architecture of many residential quarters, when cell load is lighter, adopts the above-mentioned reference symbol sebolic addressing to transmit; When cell load was heavier, the mode that adopts the above-mentioned reference symbol sebolic addressing to mix with the suboptimum reference symbol sequence was transmitted.
Another aspect of the present invention provides a kind of system of transmitting reference symbol under the architecture of many residential quarters, this system comprises: many residential quarters architecture comprises at least one many community mobile communications net, and many residential quarters comprise at least two residential quarters that take the same frequency band resource; This system is used for being transferred to one or more receiving equipments with reference to symbol from the different antennae of at least two residential quarters; Wherein, the Frame of launching on the different antennae of at least two residential quarters adopts different normal amplitudes zero auto-correlation code CAZAC code as the reference symbol, the code seed M that the CAZAC code that per two code lengths are identical uses iDifference satisfy aforementioned optimum reference symbol sequence or the described feature of suboptimum reference symbol.
Provided by the invention under the architecture of many residential quarters among the embodiment of system of transmission reference symbol, this system comprises: high-rise pilot resources distributor is used for to each cell allocation pilot code resource; Wherein, the code seed M of the pilot code of each residential quarter iWith code length N FArrange according to cell load; When cell load is lighter, adopt aforementioned optimum reference symbol sequence to transmit; When cell load was heavier, the mode that adopts aforementioned optimum reference symbol sequence to mix with the suboptimum reference symbol sequence was transmitted.
Provided by the invention under the architecture of many residential quarters among the embodiment of system of transmission reference symbol, this system also comprises: a plurality of portable terminals that are positioned at each residential quarter; Inner in each residential quarter, the CAZAC code that the portable terminal of different user is assigned with the different phase shifts of same code seed suppresses interference in the residential quarter as its pilot code.
Provided by the invention under the architecture of many residential quarters among the embodiment of system of transmission reference symbol, at transmitting terminal, then pilot code and user data send data through inverse fast fourier transform and cyclic prefix extension; At receiving terminal, a plurality of users' signal is received simultaneously, obtains receiving signal through fast Fourier transform, then extracts respectively reception signal corresponding to pilot code part and reception signal corresponding to user data part.
Provided by the invention under the architecture of many residential quarters among the embodiment of system of transmission reference symbol, for reception signal corresponding to pilot code part, utilize the local pilot code of different user, through joint channel estimation, obtain the channel estimating to different user, the channel information that estimation obtains is delivered to the Data Detection unit as prior information and is carried out Data Detection.
Provided by the invention under the architecture of many residential quarters among the embodiment of system of transmission reference symbol, the CAZAC code is the Chu sequence, namely
c M ( n ) = e j Mπn ( n + mod ( N F , 2 ) ) N F , n = 0 . . . N F - 1 ,
Wherein, M is the seed of CAZAC code, N FBe the code length of CAZAC code, for same CAZAC code, M and N FRelatively prime.
The method and system of transmitting reference symbol under the architecture of many residential quarters of confession of the present invention are selected reference signal according to loading condition, when cell load is light, adopt optimum reference symbol sequence; When cell load is heavy, adopt optimum reference symbol sequence to mix the mode of using with the suboptimum reference symbol sequence; Employing has the reference symbol of the present invention's description as the frequency pilot sign of two cell channel estimated service lives, and the frequency pilot sign that can minimize the minizone disturbs, and reduces the channel estimating mean square error.
Description of drawings
Fig. 1 shows the reference signal application scenarios schematic diagram under the architecture of many residential quarters;
Fig. 2 shows and adopts different code seed M iDifference M ' for the schematic diagram of channel estimating mean square error impact;
Fig. 3 shows and adopts reference symbol described in the invention on the schematic diagram of bit error rate impact;
Fig. 4 shows the structural representation of the reference symbol distribution system in the architecture of many residential quarters.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
In the reference signal application scenarios under many residential quarters architecture shown in Fig. 1, in in reference cell (Reference cell) coverage portable terminal MT is arranged, in the coverage of two interfered cells (Interfering Cell1 and Cell2) a portable terminal INT1 and INT2 are arranged respectively; Described three portable terminals all are in the covering edge of residential quarter.
Take the multi-cell system of frequency duplex factor as one as 1 as example, the frequency resource of three neighbor cell sharing systems.In each residential quarter the mobile subscriber is arranged.In some cases, some mobile subscribers have arrived cell edge.In channel estimation process, the user who arrives this cell edge from neighbor cell is larger to the interference ratio of this community user, therefore, is necessary so that the pilot code that this cell mobile terminal uses can fully suppress the multi-user interference of neighbor cell.
Provided by the invention under the architecture of many residential quarters among the embodiment of method of transmission reference symbol, this many residential quarters architecture comprises at least one many community mobile communications net, and described many residential quarters comprise at least two residential quarters that take the same frequency band resource; Described method comprises: described reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters; The Frame of launching on the different antennae of at least two residential quarters adopts the different reference symbols based on normal amplitude zero auto-correlation code CAZAC code; The code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and this CAZAC code FBe even number, and M '/cof and N F/ cof is odd number; Wherein, i is natural number, and cof is common factor.
The CAZAC code of the optimum reference symbol of describing take the present invention is used for two district pilots codes and describes further technical scheme of the present invention in detail as example.In the OFDM of residential quarter more than (OFDM, orthogonal frequency division multiplexing) system, in channel estimation process, each portable terminal sends the channel estimating that specific pilot code is used for this terminal.In the situation of code division multiplexing, namely each portable terminal has all taken all ofdm system sub-carrier resources, and each portable terminal uses the pilot code (as the CAZAC code with phase shift orthogonality) with certain orthogonality to estimate channel separately.For example, two employed pilot code in residential quarter are: code length N F=1008 Chu sequence, specific as follows shown in:
c M ( n ) = e j Mπn ( n + mod ( N F , 2 ) ) N F , n = 0 . . . N F - 1 ,
Wherein, M is the seed of CAZAC code, N FBe the code length of CAZAC code, for same CAZAC code, M and N FRelatively prime.
Mobile subscriber MT in reference cell (Reference cell), MT1 selects a yard seed M 1=5 Chu sequence and different time shift (or phase shift) sequence thereof are as pilot tone, and the mobile subscriber INT1 in the interfered cell (Interfering cell 1) selects a yard seed M 2=53 Chu sequence and different time shift (or phase shift) sequence thereof are as pilot tone.Exemplarily describe according to of the present invention, those skilled in the art can clearly know the pilot code of this neighbor cell, and it can satisfy the described characteristic of the optimum reference symbol of the present invention between any two: code seed M 1With M 2Difference M '=48, code length N F=1008, namely be even number; Both common factor cof=48, then M '/cof=48/48=1 and N F/ cof=1008/48=21 is odd number, thereby so that has minimum interference between the residential quarter.Inner in the residential quarter, the different phase shifts of using the CAZAC code can suppress interference in the residential quarter as the pilot code of the upper use of different antennae/user.
Provided by the invention under the architecture of many residential quarters the transmission reference symbol another embodiment of method in, this many residential quarters architecture comprises at least one many community mobile communications net, described many residential quarters comprise at least two residential quarters that take the same frequency band resource; Described method comprises: described reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters; The Frame of launching on the different antennae of at least two residential quarters adopts the different reference symbols based on normal amplitude zero auto-correlation code CAZAC code; The code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and CAZAC code FBe even number, M '/cof and N F/ cof is not odd number entirely, and common factor cof is as far as possible little, and (cof depends on M ' and N F, work as N FOne regularly, selects M ' so that cof minimizes).
Mobile subscriber MT in reference cell (Reference cell), MT1 selects a yard seed M 1=5 Chu sequence and different time shift (or phase shift) sequence thereof are as pilot tone, and the mobile subscriber INT1 in the interfered cell (Interfering cell 1) selects the code seed M that meets suboptimum reference symbol feature 2=101 or 173 Chu sequence and different time shift (or phase shift) sequence thereof are as pilot tone.Exemplarily describe according to of the present invention, those skilled in the art can clearly know the pilot code of this neighbor cell, and it can satisfy the described characteristic of suboptimum reference symbol of the present invention between any two: work as M 2=101 o'clock, difference M ' and code length N FCommon factor cof be 48, be even number, and N F/ cof is 21, is odd number; M '/cof is 2, is even number;
Work as M 2=173 o'clock, difference M ' and code length N FCommon factor cof be 24, be even number, and N F/ cof is 42, is even number; M '/cof is 7, is odd number.
Fig. 2 shows and adopts different code seed M iDifference M ' for the schematic diagram of channel estimating mean square error impact.
As shown in Figure 2, be used to two district pilots symbols based on the CAZAC code of Chu sequence, in order to this Multiinputoutput (MIMO) ofdm system is carried out channel estimating.The sub-carrier number of this system is 1008, and frequency pilot sign and data symbol (being the symbol after the bits of user data modulation) adopt time division multiplexing to transmit.It is 1008 Chu sequence that pilot length is selected length, and the parameter that reference cell is chosen the Chu sequence is M 1=5; An interfered cell, its yard seed is chosen the M that meets optimum reference symbol feature 2=53 (both consist of the optimal pilot sequence), and the code seed M that meets suboptimum reference symbol feature 2=101, M 2=173 (work as M 2=101 o'clock, difference M ' and code length N FCommon factor cof be 48, be even number, and N F/ cof is 21, is odd number; M '/cof is 2, is even number; Work as M 2=173 o'clock, difference M ' and code length N FCommon factor cof be 24, be even number, and N F/ cof is 42, is even number; M '/cof is 7, is odd number; Two kinds of situations all consist of the suboptimum pilot frequency sequence).Can find out that from simulation result shown in Figure 2 (least mean-square error, the Mean Square Error) performance of MSE when using optimum reference sequences and the situation when not disturbing are almost identical; And (work as N when adopting the suboptimum reference symbol sequence FWhen/cof and M '/cof is not odd number entirely), systematic function will be along with M ' and N FThe increase of common factor cof and variation.This shows, at M '/cof and N F/ cof is not odd number entirely, and common factor cof hour is conducive to as far as possible to suppress signal that the Wireless Telecom Equipment of other residential quarter sends the Wireless Telecom Equipment signal of this residential quarter is caused interference.
Provided by the invention under the architecture of many residential quarters the transmission reference symbol embodiment of method in, when cell load is lighter, adopt the mode of aforementioned optimal pilot sequence that reference symbol sequence is transmitted; When cell load was heavier, the mode that adopts the mode of aforementioned optimal pilot sequence to mix with aforementioned suboptimum reference symbol sequence was transmitted reference symbol.Specifically, judge according to the pilot tone of having distributed and the weight of load if available optimal pilot uses, can adopt hybrid mode.
A kind of system of under the architecture of many residential quarters, transmitting reference symbol provided by the invention, described many residential quarters architecture comprises at least one many community mobile communications net, described many residential quarters comprise at least two residential quarters that take the same frequency band resource; This system is used for described reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters; Wherein, the Frame of launching on the different antennae of at least two residential quarters adopts different normal amplitudes zero auto-correlation code CAZAC code as the reference symbol, the code seed M that the CAZAC code that per two code lengths are identical uses iDifference satisfy aforementioned optimal pilot sequence or the described feature of suboptimum pilot frequency sequence.
Fig. 3 shows and adopts reference symbol described in the invention on the schematic diagram of bit error rate impact.
As shown in Figure 3, the carrier frequency of MIMO ofdm system is 2GHz among this embodiment, and system bandwidth is 10MHz, and effective bandwidth is 9MHz, and the carrier spacing is 15KHz, and the base station spacing is 500m, and the path loss model is L=128.1+37.6log 10(d), wherein d represents distance; Rate travel is 30km/h, adopts 6 footpath SCME (service control function call manager entity, Service Control function call Manager Entity) channels.Fig. 3 shows and adopts optimum reference symbol described in the invention to mix the performance boost effect that use brings the MIMO ofdm system with the suboptimum reference symbol.By with the BER (bit error rate that does not adopt reference symbol described in the invention to produce, Bit Error Ratio) compares, can find out: the mode that adopts optimum reference symbol to mix with the suboptimum reference symbol, in contrast to the reference symbol that does not adopt feature described in the invention, under same signal to noise ratio (SNR), still can effectively reduce bit error rate, elevator system performance.Beyond any doubt, adopt merely the mode of optimum reference symbol, the effect of its elevator system performance will be more obvious.In addition, those skilled in the art can clearly recognize: owing to can adopt the suboptimum reference symbol to reduce bit error rate, therefore, introduce the quantity that the suboptimum reference symbol can expand reference symbol further, be conducive to satisfy the demand of System Expansion.
Fig. 4 shows the structural representation of the reference symbol distribution system in the architecture of many residential quarters.
Take an ofdm system with two residential quarters as example, this system comprises high-rise pilot resources distributor, is used for to each cell allocation pilot code resource; Wherein, the code seed M of the pilot code of each residential quarter iWith code length N FArrange according to cell load and (when cell load is lighter, to adopt the mode of aforementioned optimal pilot sequence that reference symbol sequence is transmitted; When cell load was heavier, the mode that adopts the mode of aforementioned optimal pilot sequence to mix with aforementioned suboptimum reference symbol sequence was transmitted reference symbol).Each residential quarter comprises a plurality of mobile subscribers, and this embodiment contains two users as example take every residential quarter.1 assigned code seed is M to high-rise pilot resources distributor to the residential quarter 1Pilot code, 2 assigned code seeds are M to the residential quarter 2Pilot code, M 1, M 2With code length N FAll need according to cell load, satisfy aforementioned optimal pilot sequence or the described feature of suboptimum pilot frequency sequence.Inner in each residential quarter, the CAZAC code that different user is assigned with the different phase shifts of same code seed suppresses interference in the residential quarter as its pilot code.
For each mobile subscriber, (this transmitting terminal can be the transmitting terminal of portable terminal at transmitting terminal for pilot code and user data, also can be the antenna for base station equipment that the residential quarter transmitting/receiving is used) the time division multiplex system resource, through inverse fast fourier transform (IFFT) and Cyclic Prefix (CP) expansion, the Frame that generates is sent.
Receiving terminal (this receiving terminal can be the receiving terminal of portable terminal, or the antenna for base station equipment used of residential quarter transmitting/receiving), two users' signal is received simultaneously.At first pass through fast Fourier transform (FFT) and obtain receiving signal, then extract respectively reception signal corresponding to pilot code part and reception signal corresponding to user data part.For reception signal corresponding to pilot code part, utilize local pilot code 1 and local pilot code 2, through joint channel estimation, obtain the channel estimating to user 1 and user 2, the channel information that estimation obtains is delivered to the Data Detection unit as prior information, carries out the detection of data.Whole system is through above-mentioned this residential quarter and the neighbor cell pilot code resource allocation methods according to cell load, at establishment guaranteed cell capacity in the interference of in the channel estimation process small area and minizone.
With reference to the exemplary description of aforementioned the present invention, those skilled in the art can clearly know the present invention and have the following advantages:
1, the method and system of transmitting reference symbol under the architecture of many residential quarters provided by the invention are selected reference signal according to loading condition, when cell load is light, adopt optimum reference symbol sequence; When cell load is heavy, adopt optimum reference symbol sequence to mix the mode of using with the suboptimum reference symbol sequence; Employing has the reference symbol of the present invention's description as the frequency pilot sign of two cell channel estimated service lives, and the frequency pilot sign that can minimize the minizone disturbs, and reduces the channel estimating mean square error.
2, the method and system of transmitting reference symbol under the architecture of many residential quarters provided by the invention are adjusted reference signal according to the loading condition of residential quarter, can improve power system capacity, satisfy the requirement of System Expansion upgrading.Further, owing to select the suboptimum reference symbol as a supplement, therefore, the present invention can expand the quantity of reference symbol.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the present invention's design is suitable for special-purpose.

Claims (12)

  1. One kind under the architecture of many residential quarters the transmission reference symbol method, described many residential quarters architecture comprises at least one many community mobile communications net, described many residential quarters comprise at least two residential quarters that take the same frequency band resource; It is characterized in that described method comprises:
    Described reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters;
    The Frame of launching on the different antennae of at least two residential quarters adopts the different reference symbols based on normal amplitude zero auto-correlation code CAZAC code;
    The code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and this CAZAC code FBe even number, and M '/cof and N F/ cof is odd number;
    Wherein, i is natural number, and cof is M ' and N FCommon factor.
  2. 2. method according to claim 1 is characterized in that, the code seed M that the CAZAC code that per two code lengths are identical uses iThe code length N of difference M ' and CAZAC code FBe even number, M '/cof and N F/ cof is not odd number entirely, and common factor cof is as far as possible little.
  3. 3. method according to claim 1 and 2 is characterized in that, described CAZAC code is the Chu sequence, namely
    c M ( n ) = e j Mπn ( n + mod ( N F , 2 ) ) N F , n = 0 · · · N F - 1 ,
    Wherein, M is the seed of CAZAC code, N FBe the code length of CAZAC code, for same CAZAC code, M and N FRelatively prime.
  4. 4. method according to claim 1 and 2, it is characterized in that, described receiving equipment receives the signal from the Wireless Telecom Equipment of at least one residential quarter, and the signal that the Wireless Telecom Equipment of other residential quarter sends causes interference to the Wireless Telecom Equipment signal of this residential quarter.
  5. 5. method according to claim 1 and 2 is characterized in that, user data transmits at described Frame, and with described reference symbol multiplex system resource.
  6. 6. the method for a transmission reference symbol under the architecture of many residential quarters is characterized in that, when cell load is lighter, adopts reference symbol sequence as claimed in claim 1 to transmit; When cell load is heavier, the mode that adopts reference symbol sequence as claimed in claim 1 to mix with reference symbol sequence claimed in claim 2 is transmitted, wherein judge the weight of cell load according to the pilot tone of having distributed, if optimal pilot uses, then cell load is heavier, if optimal pilot does not use, then cell load is lighter.
  7. One kind under the architecture of many residential quarters the transmission reference symbol system, described many residential quarters architecture comprises at least one many community mobile communications net, described many residential quarters comprise at least two residential quarters that take the same frequency band resource; It is characterized in that described system is used for described reference symbol is transferred to one or more receiving equipments from the different antennae of at least two residential quarters; Wherein, the Frame of launching on the different antennae of at least two residential quarters adopts different normal amplitudes zero auto-correlation code CAZAC code as the reference symbol, the code seed M that the CAZAC code that per two code lengths are identical uses iDifference satisfy claim 1 or the described feature of claim 2.
  8. 8. system according to claim 7 is characterized in that, described system comprises: high-rise pilot resources distributor is used for to each cell allocation pilot code resource; Wherein, the code seed M of the pilot code of each residential quarter iWith code length N FArrange according to cell load;
    When cell load is lighter, adopt reference symbol sequence as claimed in claim 1 to transmit; When cell load is heavier, the mode that adopts reference symbol sequence as claimed in claim 1 to mix with reference symbol sequence claimed in claim 2 is transmitted, wherein judge the weight of cell load according to the pilot tone of having distributed, if optimal pilot uses, then cell load is heavier, if optimal pilot does not use, then cell load is lighter.
  9. 9. system according to claim 8 is characterized in that, described system also comprises: a plurality of portable terminals that are positioned at each residential quarter; Inner in each residential quarter, the CAZAC code that the portable terminal of different user is assigned with the different phase shifts of same code seed suppresses interference in the residential quarter as its pilot code.
  10. 10. system according to claim 9 is characterized in that, at transmitting terminal, then described pilot code and user data send data through inverse fast fourier transform and cyclic prefix extension;
    At receiving terminal, a plurality of users' signal is received simultaneously, obtains receiving signal through fast Fourier transform, then extracts respectively reception signal corresponding to pilot code part and reception signal corresponding to user data part.
  11. 11. system according to claim 10, it is characterized in that, for reception signal corresponding to pilot code part, utilize the local pilot code of different user, through joint channel estimation, obtain the channel estimating to different user, the channel information that estimation obtains is delivered to the Data Detection unit as prior information and is carried out Data Detection.
  12. 12. system according to claim 7 is characterized in that, described CAZAC code is the Chu sequence, namely
    c M ( n ) = e j Mπn ( n + mod ( N F , 2 ) ) N F , n = 0 · · · N F - 1 ,
    Wherein, M is the seed of CAZAC code, N FBe the code length of CAZAC code, for same CAZAC code, M and N FRelatively prime.
CN 201010546232 2010-11-15 2010-11-15 Method and system for transmitting reference signs under generalized cell system structure Expired - Fee Related CN102075948B (en)

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