CN101442379A - Method and apparatus for sending and receiving data - Google Patents
Method and apparatus for sending and receiving data Download PDFInfo
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- CN101442379A CN101442379A CNA2007101708351A CN200710170835A CN101442379A CN 101442379 A CN101442379 A CN 101442379A CN A2007101708351 A CNA2007101708351 A CN A2007101708351A CN 200710170835 A CN200710170835 A CN 200710170835A CN 101442379 A CN101442379 A CN 101442379A
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Abstract
The invention discloses a method for providing data sending and receiving and a device thereof. The method for sending data comprises the following steps: according to a first coding word, generating a second code word changed along with time; using the second code word to expand the data to acquire expanded data; modulating the expanded data to acquire the modulated data; and sending the modulated data. With the method for sending and receiving data and the device thereof, a first user of a first cell and a second user of a second cell receive the same first coding word and acquire the second coding word respectively along the time change according to the first coding word; the second code word acquired by the first coding word is likely different from the second coding word acquired by the second user; therefore, when the second coding word is used to modulate/demodulate the data, no interference is caused between the first user and the second user, thereby improving reliability of data transmission.
Description
Technical field
The present invention relates to field of data transmission, particularly data transmission, the method and the device that receive.
Background technology
Along with express network technology and development of multimedia technology, undergoing an unusual development of wireless network is swift and violent, and the development trend of wireless network evolves to packet switching from circuit switching gradually, and various WiMAX access technologies emerge in an endless stream.
The mode that a kind of WiMAX inserts is the running time-frequency resource that makes different CUs different, that is, adopt code word to represent running time-frequency resource, and different code words are represented different running time-frequency resources, and the user uses different code words, thereby takies different running time-frequency resources.
In realizing process of the present invention, the inventor finds to adopt the mode of this kind WiMAX access can bring following problem:
When first sub-district and second sub-district are neighbor cell, if second user of first user of first sub-district and second sub-district uses identical code word, promptly, first user uses identical code word that the data that send are modulated with second user, and/or the data that receive are carried out demodulation, then modulate and/or separate timing first user, second user can cause interference to first user, equally, second user modulates and/or separates timing, first user also can cause interference to second user, thereby reduces reliability of data transmission.
Summary of the invention
The purpose of the embodiment of the invention is to provide data transmission, the method and the device that receive, improves reliability of data transmission.
The method that the embodiment of the invention provides a kind of data to send, this method comprises:
According to first code word, generate time dependent second code word;
Data are expanded the data after being expanded with described second code word;
Data after the described expansion are modulated the data after obtaining modulating;
Send the data after the described modulation.
The embodiment of the invention also provides a kind of method of Data Receiving, and this method comprises:
According to first code word, generate time dependent second code word;
Receive data;
After the data demodulates that receives, obtain demodulating data;
With described second code word described demodulating data is carried out despreading.
The device that the embodiment of the invention also provides a kind of data to send, this device comprises:
The code word generation unit is used for according to first code word, generates time dependent second code word;
Expanding element is used for data being expanded the data after being expanded with described second code word;
Modulating unit is used for the data after the described expansion are modulated, the data after obtaining modulating;
Transmitting element is used to send the data after the described modulation.
The embodiment of the invention also provides a kind of device of Data Receiving, and this device comprises:
The code word generation unit is used for according to first code word, generates time dependent second code word;
Receiving element is used to receive data;
Demodulating unit is used for described data are carried out demodulation, obtains demodulating data;
Despread unit is used for described second code word described demodulating data being carried out despreading.
The method and the device that adopt embodiment of the invention data to send, receive, when second user of first user of first sub-district and second sub-district receives the first identical code word, respectively according to first code word, obtain second code word after changing in time, second code word that first user obtains is different with second code word possibility that second user obtains, like this when using second code word that data are carried out modulating/demodulating, just can not cause interference between first user and second user, thereby improve reliability of data transmission.
Description of drawings
Fig. 1 is the schematic flow sheet of the method embodiment one of data transmission of the present invention;
Fig. 2 is the schematic flow sheet of the method embodiment one of Data Receiving of the present invention;
Fig. 3 is the schematic flow sheet of the method embodiment two of data transmission of the present invention;
Fig. 4 is that code word changes schematic diagram among the method embodiment two that sends of data of the present invention;
Fig. 5 is the schematic flow sheet of the method embodiment three of data transmission of the present invention;
Fig. 6 is the structural representation of the device embodiment of data transmission of the present invention;
Fig. 7 is the structural representation of the device embodiment of Data Receiving of the present invention.
Embodiment
Embodiment one, the method that a kind of data send, and referring to Fig. 1, this method comprises:
101,, generate time dependent second code word according to first code word.
First code word is the logic code word that cell allocation is given the user, the logic code word of an interior different districts of base station scope can be the same or different, the base station is according to time-frequency resource allocating logic codeword set, and different districts obtains the logic code word respectively in the scope of base station from this logic codeword set.
For first user that prevents first sub-district and second user of second sub-district use the first identical code word, according to first code word, generate time dependent second code word, second code word that first user obtains is different with second code word possibility that second user obtains, thereby reduce the conflict that the different districts user uses the second identical code word, also reduce the interference between the different districts user, improve the reliability of different districts user data transmission.
In the present embodiment, according to first code word, the mode that generates time dependent second code word can comprise following two kinds:
Mode one comprises the steps:
With first code word and time as first function parameters, carry out first functional transformation;
With the result of first functional transformation as second code word.
Can use CodeIndex
LogicRepresent first code word; The Time express time; CodeIndex
PhyRepresent second code word; Others represents other parameters, for example the sub-district parameter and/or user be set parameter etc. is set; (x, y z) represent first function, and then first functional transformation is closed and is: CodeIndex with f
Phy=f (CodeIndex
Logic, Time, Others).
In the manner, first function is the corresponding relation of first code word and second code word, and first function can adopt Cowes tower COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence or hash function or SIN function etc.When network configuration, configure first function that adopt the sub-district, after first functional transformation, obtain the second different code words, avoid the interference between the different districts user, improve the reliability of different districts user data transmission.
Mode two comprises the steps:
Receive second function;
First code word, time and cell number as second function parameters, are carried out second functional transformation;
With the result of second functional transformation as second code word.
Can use CodeIndex
LogicRepresent first code word; The Time express time; CellID represents cell number; CodeIndex
PhyRepresent second code word; Others represents other parameters, for example the sub-district parameter and/or user be set parameter etc. is set; (t z) represents first function for x, y, and then first functional transformation is closed and is: CodeIndex with f
Phy=f (CodeIndex
Logic, Time, CellID, Others).
In the manner, second function also is the corresponding relation of first code word and second code word, can adopt COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence or hash function or SIN function etc.When network configuration, configure first function that adopt the sub-district.
The different districts user distributes the first identical code word, because different districts user's cell number difference, it is the different districts user second function parameters difference, after second functional transformation, obtain the second different code words, avoid the interference between the different districts user, improve the reliability of different districts user data transmission.
Second function parameters is not limited only to first code word, time and cell number, can also comprise the sub-district parameter and/or user be set parameter etc. is set.
102, with second code word data are expanded the data after being expanded.
The data and second code word can be multiplied each other, the back data are expanded; Can also adopt other mode that data are expanded.
103, the data after the expansion are modulated the data after obtaining modulating.
The mode of modulation has multiple, can adopt the mode of Fourier transform to modulate, and also can adopt the mode of fast fourier transform to modulate, and can also adopt other modulation system that the data after expanding are modulated.
104, the data after the transmission modulation.
The method that adopts the present embodiment data to send, even second user of first user of first sub-district and second sub-district receives the first identical code word, because respectively according to first code word, obtain second code word after changing in time, second code word that second code word that first user obtains and second user obtain can be not identical always yet.When using second code word that data are modulated, just can not cause interference between first user and second user like this, thereby improve reliability of data transmission.The method that adopts the present embodiment data to send, the randomization that district code word can be conflicted, the planning of raising sub-district.
When first sub-district and second sub-district are neighbor cell, because the interference between the neighbor cell is bigger, the method that adopts the present embodiment data to send, can reduce the possibility of second codeword collisions between the neighbor cell, thereby reduce the possibility of disturbing between the neighbor cell user, improve reliability of data transmission, further, improve the reliability of communication network.
There are a plurality of first code words the sub-district, can all adopt the mode of step 101 to carry out conversion to whole first code words according to the conflict situations of first code word, generates second code word; Also can adopt the mode of step 101 to carry out conversion, generate second code word, improve the flexibility that code source utilizes in the sub-district part first code word.
The method of embodiment one, a kind of Data Receiving, referring to Fig. 2, this method comprises:
201,, generate time dependent second code word according to first code word.
First code word is the logic code word that base station assigns is given the sub-district, the base station is according to time-frequency resource allocating logic codeword set, the assignment logic code word is given corresponding district from this logic codeword set, the user is distributed to the logic code word again in the sub-district, and the logic code word of an interior different districts of base station scope can be the same or different.
In the present embodiment, according to first code word, the mode that generates time dependent second code word can comprise following two kinds:
Mode one comprises the steps:
With first code word and time as first function parameters, carry out first functional transformation;
With the result of first functional transformation as second code word.
Can use CodeIndex
LogicRepresent first code word; The Time express time; CodeIndex
PhyRepresent second code word; Others represents other parameters, for example the sub-district parameter and/or user be set parameter etc. is set; (x, y z) represent first function, and then first functional transformation is closed and is: CodeIndex with f
Phy=f (CodeIndex
Logic, Time, Others).
In the manner, first function is the corresponding relation of first code word and second code word, can adopt Cowes tower COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence or hash function or SIN function etc.Like this,, can avoid the interference between the different districts user, reliability of data transmission between raising and the different districts user even identical first code word that the different districts user distributes after first functional transformation, obtains the second different code words.
Mode two comprises the steps:
First code word, time and cell number as second function parameters, are carried out second functional transformation;
With the result of second functional transformation as second code word.
Can use CodeIndex
LogicRepresent first code word; The Time express time; CellID represents cell number; CodeIndex
PhyRepresent second code word; Others represents other parameters, for example the sub-district parameter and/or user be set parameter etc. is set; (t z) represents first function for x, y, and then first functional transformation is closed and is: CodeIndex with f
Phy=f (CodeIndex
Logic, Time, CellID, Others).
In the manner, second function also is the corresponding relation of first code word and second code word, can adopt COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence or hash function or SIN function etc.
Even the different districts user distributes the first identical code word, because the different districts user is as the numbering difference of second function parameter, after second functional transformation, second code word that obtains can be not identical always yet, can avoid the interference between the different districts user, improve the reliability of different districts user data transmission.
202, receive data.
203, data are carried out demodulation, obtain demodulating data.
The method of when the method correspondence of demodulation and transmission data data being modulated for example, when sending data, adopts the mode of Fourier transform to modulate to data, then separates timing employing inverse-Fourier transform and carries out demodulation; Adopt the mode of fast fourier transform to modulate, then separate timing and adopt anti-fast fourier transform to carry out demodulation.
204, with second code word demodulating data is carried out despreading.
Corresponding extended mode different when sending data, the mode of despreading also has multiple.
Step 201 and step 202 can be carried out simultaneously, can step 201 carry out before step 202, also can step 201 carry out after step 202.
Second code word of using when data expansion and despreading is corresponding, and first user is different with second code word of second user's correspondence, therefore in the process of despreading, from first user's data with from can not causing interference between second user's data, thereby improve safety of data transmission and reliability.
Embodiment two, data transmission method for uplink among the embodiment one and data receive method can be applied in the various communication networks, for example, 3-G (Generation Three mobile communication system) (3G), local multipoint distributed serice (LMDS), multiple spot multichannel distributed system technology (MMDS) and WiMax system (WiMAX) etc., present embodiment inserts the OFDM that the data transmission method for uplink among the embodiment one is applied in the piece repetition in the above communication network in (BR-OFDMA) technology.
Referring to Fig. 3, the method that the present embodiment data send comprises:
301, the high level from protocol layer receives data.
302, these data are carried out chnnel coding, obtain coded data; Coded system can comprise punching and/or interweave etc.
303, coded data is carried out symbol-modulated, bit data flow is modulated to symbol data streams, obtain symbol data, the mode of symbol-modulated can comprise binary phase shift keying (BPSK) or quarternary phase-shift keying (QPSK) (QPSK) or 16 quadrature amplitude modulation (16QAM) or 64QAM or vestigial sideband modulation (VSB) etc.
304, symbol data is carried out to piece, the generation unit blocks of data.
305, the cell block data are carried out repetition, obtain the repeating data piece, repeat into four data blocks [A, A, A, A] as a data block A.
306, with first code word, cell number and time as second function parameters, generate second code word, in the present embodiment, first code word is defined as logic add weight factor sequence, second code word is defined as physics weighted factor sequence;
For example, referring to Fig. 4, four sub-district Cell-0, Cell-1, Cell-2, Cell-3 are arranged in the present embodiment, second function adopts the COSTAS array, and second code word comprises C1, C2, C3, C4, and first code word comprises 0,1,2,3, laterally express time.For the first sub-district Cell-0, first code word 0 is at different time difference corresponding C1, C4, C2, C3; The 3rd sub-district Cell-2, first code word 3 is at different time difference corresponding C1, C2, C4, C3.Only there is codeword collisions one time in first code word, the 3 second corresponding code words of first code word 0 of the first sub-district Cell-0 and the 3rd sub-district Cell-2.
307, with repeating data piece dot product physics weighted factor sequence, the element that is some data blocks and physics weighted factor sequence correspondence position multiplies each other, obtain repeatable block, in the present embodiment, physics weighted factor sequence can be as the criterion scrambler sequence or orthogonal code sequence at random.
308, by mapping repeatable block is assigned on the different subcarrier and time quantum, obtains shining upon repeatable block.
309, will shine upon repeatable block through OFDM (OFDM) modulation, promptly pass through anti-fast fourier transform after, add Cyclic Prefix, generate time-domain signal and send.
Step 306 can be carried out simultaneously with step 301 to the wherein arbitrary step of step 305, perhaps carries out before wherein arbitrary step to step 305 in step 301, perhaps carries out after wherein arbitrary step to step 305 in step 301.
Embodiment three, and the data transmission method for uplink among the embodiment one is applied in variable-length block spread ofdma (VBS-OFDMA) technology in the communication network.
Referring to Fig. 5, the method that the present embodiment data send comprises:
501, the high level from protocol layer receives data.
502, these data are carried out chnnel coding, obtain coded data; Coded system can comprise punching and/or interweave etc.
503, coded data is carried out symbol-modulated, bit data flow is modulated to symbol data streams, obtain symbol data, the mode of symbol-modulated can comprise BPSK or QPSK or 16QAM or 64QAM or VSB etc.
504, symbol data is cut apart the generation unit piece.
505, with first code word, cell number and time as second function parameters, generate second code word, in the present embodiment, first code word and second code word are respectively the quadrature spread sequence.
506, each data element in the cell block and corresponding second code word are multiplied each other carry out the orthogonal transform expansion, obtain the quadrature spread sequence set.
507, with being mapped on the physical sub-carrier after the stack of quadrature spread sequence set, obtain mapping (enum) data, mapping mode can adopt frequency domain mapping or time domain mapping or time-frequency domain two-dimensional map etc.
508, with mapping (enum) data through string and conversion and OFDM modulation after, promptly pass through anti-fast fourier transform after, add Cyclic Prefix, generate time-domain signal and send.
Embodiment, the device that a kind of data send, referring to Fig. 6, this device comprises:
Code word generation unit 601 is used for according to first code word, generates time dependent second code word;
Expanding element 602 is used for second code word data being expanded the data after being expanded;
Transmitting element 604 is used to send the data after the modulation.
Wherein, code word generation unit and expanding element can independently be done also can integrate in two modules.
The code word generation unit is used for according to first code word, generates time dependent second code word and specifically can comprise:
With first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
First code word, time and coding as second function parameters, are carried out second functional transformation, obtain second code word.
Wherein, expanding element is used for second code word data being expanded, and the data after being expanded specifically can comprise:
Data are carried out chnnel coding, obtain coded data;
Coded data is carried out symbol-modulated, obtain symbol data;
Symbol data is carried out to piece, the generation unit blocks of data;
The cell block data are carried out repetition, obtain the repeating data piece;
With second code word and repeating data piece dot product.
Perhaps, expanding element is used for second code word data being expanded, and the data after being expanded specifically can comprise:
Data are carried out chnnel coding, obtain coded data;
Coded data is carried out symbol-modulated, obtain symbol data;
Symbol data is cut apart the generation unit piece;
Each data element in the cell block is multiplied each other with corresponding second code word.
Embodiment, a kind of device of Data Receiving, referring to Fig. 7, this device comprises:
Code word generation unit 701 is used for according to first code word, generates time dependent second code word;
Receiving element 702 is used to receive data;
Demodulating unit 703 is used for data are carried out demodulation, obtains demodulating data;
Wherein, the code word generation unit is used for according to first code word, generates time dependent second code word and specifically comprises:
With first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
First code word, time and coding as second function parameters, are carried out second functional transformation, obtain second code word.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better execution mode under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (15)
1, a kind of method of data transmission is characterized in that this method comprises:
According to first code word, generate time dependent second code word;
Data are expanded the data after being expanded with described second code word;
Data after the described expansion are modulated the data after obtaining modulating;
Send the data after the described modulation.
2, method according to claim 1 is characterized in that, and is described according to first code word, generates time dependent second code word and comprises:
With described first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
Described first code word, time and cell number as second function parameters, are carried out second functional transformation, obtain second code word.
3, method according to claim 2, it is characterized in that: described first function is Cowes tower COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence, perhaps, described second function is COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence.
4, method according to claim 1 is characterized in that, described second code word of described usefulness is expanded data and comprised:
Described data are carried out chnnel coding, obtain coded data;
Described coded data is carried out symbol-modulated, obtain symbol data;
Described symbol data is carried out to piece, the generation unit blocks of data;
Described cell block data are carried out repetition, obtain the repeating data piece;
With described second code word and described repeating data piece dot product.
5, method according to claim 1 is characterized in that, described second code word of described usefulness is expanded data and comprised:
Described data are carried out chnnel coding, obtain coded data;
Described coded data is carried out symbol-modulated, obtain symbol data;
Described symbol data is cut apart the generation unit piece;
Each data element in the described cell block is multiplied each other with corresponding second code word.
6, a kind of method of Data Receiving is characterized in that, this method comprises:
According to first code word, generate time dependent second code word;
Receive data;
After the data demodulates that receives, obtain demodulating data;
With described second code word described demodulating data is carried out despreading.
7, method according to claim 6 is characterized in that, and is described according to first code word, generates time dependent second code word and comprises:
With first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
First code word, time and cell number as second function parameters, are carried out second functional transformation, obtain second code word.
8, method according to claim 7 is characterized in that, described first function is COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence, and perhaps, described second function is COSTAS array or quadrature Latin side sequence or Hyperbolic Congruence sequence.
9, a kind of device of data transmission is characterized in that this device comprises:
The code word generation unit is used for according to first code word, generates time dependent second code word;
Expanding element is used for data being expanded the data after being expanded with described second code word;
Modulating unit is used for the data after the described expansion are modulated, the data after obtaining modulating;
Transmitting element is used to send the data after the described modulation.
10, device according to claim 9 is characterized in that, described code word generation unit and expanding element integrate.
11, device according to claim 9 is characterized in that, described code word generation unit is used for according to first code word, generates time dependent second code word and specifically comprises:
With described first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
Described first code word, time and coding as second function parameters, are carried out second functional transformation, obtain second code word.
12, device according to claim 9 is characterized in that, described expanding element is used for described second code word data being expanded, and the data after being expanded specifically comprise:
Described data are carried out chnnel coding, obtain coded data;
Described coded data is carried out symbol-modulated, obtain symbol data;
Described symbol data is carried out to piece, the generation unit blocks of data;
Described cell block data are carried out repetition, obtain the repeating data piece;
With described second code word and described repeating data piece dot product.
13, device according to claim 9 is characterized in that, described expanding element is used for described second code word data being expanded, and the data after being expanded specifically comprise:
Described data are carried out chnnel coding, obtain coded data;
Described coded data is carried out symbol-modulated, obtain symbol data;
Described symbol data is cut apart the generation unit piece;
Each data element in the described cell block is multiplied each other with corresponding second code word.
14, a kind of device of Data Receiving is characterized in that, this device comprises:
The code word generation unit is used for according to first code word, generates time dependent second code word;
Receiving element is used to receive data;
Demodulating unit is used for described data are carried out demodulation, obtains demodulating data;
Despread unit is used for described second code word described demodulating data being carried out despreading.
15, device according to claim 14 is characterized in that, described code word generation unit is used for according to first code word, generates time dependent second code word and specifically comprises:
With described first code word and time as first function parameters, carry out first functional transformation, obtain second code word; Perhaps,
Described first code word, time and coding as second function parameters, are carried out second functional transformation, obtain second code word.
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| CN111106838A (en) * | 2019-12-31 | 2020-05-05 | 华中科技大学 | Communication synchronization method, device and system |
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| WO2002007338A1 (en) * | 2000-07-04 | 2002-01-24 | Linkair Communications, Inc. | Method of converting spread spectrum multiple address code in a code division multiple access system |
| CN100382464C (en) * | 2004-06-10 | 2008-04-16 | 大唐移动通信设备有限公司 | TD-SCDMA system cell code word planning method and method for searching composite code word combination thereof |
| CN1852280A (en) * | 2005-10-13 | 2006-10-25 | 华为技术有限公司 | Method for transmitting empty hour code for orthogonal frequency division multiplexing system |
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