CN101442379B - Method and device for transmitting and receiving data - Google Patents
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Abstract
The invention discloses a method and a device for transmitting and receiving data, wherein the method for transmitting the data comprises the following steps: generating a second code word which changes along with time according to the first code word; expanding the data by using the second code word to obtain expanded data; modulating the expanded data to obtain modulated data; and transmitting the modulated data. By adopting the method and the device for transmitting and receiving data, when a first user in a first cell and a second user in a second cell receive the same first code word, the second code word is obtained after changing along with time according to the first code word, and the second code word obtained by the first user and the second code word obtained by the second user are possibly different, so that when the second code word is used for modulating/demodulating the data, the interference between the first user and the second user can not be caused, and the reliability of data transmission is improved.
Description
Technical Field
The present invention relates to the field of data transmission, and in particular, to a method and an apparatus for transmitting and receiving data.
Background
With the rapid development of high-speed network technology and multimedia technology, the development of wireless networks is very rapid, the development trend of wireless networks gradually evolves from circuit switching to packet switching, and various wireless broadband access technologies emerge endlessly.
One way of wireless broadband access is to let different users occupy different time frequency resources, i.e. using code words to represent time frequency resources, different code words to represent different time frequency resources, and users using different code words to occupy different time frequency resources.
In the process of implementing the present invention, the inventor finds that the following problems are caused by adopting the wireless broadband access mode:
when the first cell and the second cell are adjacent cells, if the first user of the first cell and the second user of the second cell use the same code word, that is, the first user and the second user use the same code word to modulate the transmitted data and/or demodulate the received data, the second user may cause interference to the first user when the first user performs modulation and/or demodulation, and similarly, when the second user performs modulation and/or demodulation, the first user may also cause interference to the second user, thereby reducing reliability of data transmission.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for transmitting and receiving data, which improve the reliability of data transmission.
The embodiment of the invention provides a data sending method, which comprises the following steps:
generating a second code word which changes along with time according to the first code word;
expanding the data by using the second code word to obtain expanded data;
modulating the expanded data to obtain modulated data;
and transmitting the modulated data.
The embodiment of the invention also provides a data receiving method, which comprises the following steps:
generating a second code word which changes along with time according to the first code word;
receiving data;
demodulating the received data to obtain demodulated data;
despreading the demodulated data with the second codeword.
The embodiment of the invention also provides a data sending device, which comprises:
the code word generating unit is used for generating a second code word which changes along with time according to the first code word;
the extension unit is used for extending the data by using the second code word to obtain the extended data;
a modulation unit, configured to modulate the spread data to obtain modulated data;
and a transmitting unit, configured to transmit the modulated data.
The embodiment of the invention also provides a data receiving device, which comprises:
the code word generating unit is used for generating a second code word which changes along with time according to the first code word;
a receiving unit for receiving data;
the demodulation unit is used for demodulating the data to obtain demodulated data;
a despreading unit for despreading the demodulated data with the second codeword.
By adopting the method and the device for sending and receiving data in the embodiment of the invention, when a first user in a first cell and a second user in a second cell receive the same first code word, the second code word is obtained after changing along with time according to the first code word, and the second code word obtained by the first user and the second code word obtained by the second user are possibly different, so that when the second code word is used for modulating/demodulating data, interference can not be caused between the first user and the second user, and the reliability of data transmission is improved.
Drawings
Fig. 1 is a flowchart illustrating a first embodiment of a data transmission method according to the present invention;
FIG. 2 is a flowchart illustrating a first embodiment of a data receiving method according to the present invention;
FIG. 3 is a flowchart illustrating a second embodiment of a data transmission method according to the present invention;
FIG. 4 is a diagram illustrating codeword changes in a second embodiment of a data transmission method according to the present invention;
FIG. 5 is a flowchart of a third embodiment of a data transmission method according to the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of a data transmission apparatus according to the present invention;
fig. 7 is a schematic structural diagram of an embodiment of a data receiving apparatus according to the present invention.
Detailed Description
In a first embodiment, a method for data transmission, referring to fig. 1, includes:
101. and generating a second code word which changes along with time according to the first code word.
The first code word is a logic code word allocated to a user by a cell, the logic code words of different cells in a base station range can be the same or different, the base station allocates a logic code word set according to time-frequency resources, and different cells in the base station range respectively obtain the logic code words from the logic code word set.
In order to prevent a first user of a first cell and a second user of a second cell from using the same first code word, a second code word which changes along with time is generated according to the first code word, and the second code word obtained by the first user and the second code word obtained by the second user are possibly different, so that the conflict that different cell users use the same second code word is reduced, the interference among different cell users is also reduced, and the reliability of data transmission of different cell users is improved.
In this embodiment, the manner of generating the time-varying second codeword according to the first codeword may include the following two ways:
the method comprises the following steps:
taking the first code word and time as parameters of a first function, and performing first function transformation;
and taking the result of the first function transformation as a second code word.
Can use CodeIndexLogicRepresents a first codeword; time represents Time; CodeIndexphyRepresents a second codeword; other parameters, such as setting parameters of a cell and/or setting parameters of a user, etc.; the first function is represented by f (x, y, z), and the transformation relationship of the first function is: CodeIndexphy＝f(CodeIndexLogic，Time，Others)。
In this embodiment, the first function is a corresponding relationship between the first codeword and the second codeword, and the first function may adopt a COSTAS array, an orthogonal Latin-square sequence, a hyperbolic congruence sequence, a hash function, a sine function, or the like. When the network is configured, the first function adopted by the cell is configured, and different second code words are obtained after the first function is transformed, so that the interference among users in different cells is avoided, and the reliability of data transmission of the users in different cells is improved.
The second mode comprises the following steps:
receiving a second function;
taking the first code word, the time and the cell number as parameters of a second function, and performing second function transformation;
and taking the result of the second function transformation as a second code word.
Can use CodeIndexLogicRepresents a first codeword; time represents Time; CellID denotes a cell number; CodeIndexphyRepresents a second codeword; other parameters, such as setting parameters of a cell and/or setting parameters of a user, etc.; the first function is represented by f (x, y, t, z), and the transformation relationship of the first function is: CodeIndexphy＝f(CodeIndexLogic，Time，CellID，Others)。
In this embodiment, the second function is also a corresponding relationship between the first codeword and the second codeword, and can adopt a COSTAS array, an orthogonal Latin square sequence, a hyperbolic congruence sequence, a hash function, a sine function, or the like. When the network is configured, a first function adopted by a cell is configured.
Different cell users are allocated with the same first code word, and different cell numbers of the different cell users are different, namely different parameters of second functions of the different cell users are different, and different second code words are obtained after the second functions are transformed, so that interference among the different cell users is avoided, and the reliability of data transmission of the different cell users is improved.
The parameters of the second function are not limited to the first codeword, time and cell number, but may also include setting parameters of a cell and/or setting parameters of a user, etc.
102. And expanding the data by using the second code word to obtain expanded data.
The data may be multiplied by a second codeword to obtain expanded data; the data may also be expanded in other ways.
103. And modulating the spread data to obtain modulated data.
The modulation method may be various, and may be a fourier transform method, a fast fourier transform method, or another modulation method.
104. And transmitting the modulated data.
By adopting the data sending method of the embodiment, even if the first user in the first cell and the second user in the second cell receive the same first code word, the second code word obtained by the first user and the second code word obtained by the second user are not always the same because the second code word is obtained after time change according to the first code word. Therefore, when the second code word is used for modulating the data, interference between the first user and the second user is avoided, and the reliability of data transmission is improved. By adopting the data transmission method of the embodiment, the code word conflict of the cell can be randomized, and the planning of the cell is improved.
When the first cell and the second cell are adjacent cells, because the interference between the adjacent cells is large, the data transmission method of the embodiment can reduce the possibility of second codeword collision between the adjacent cells, thereby reducing the possibility of interference between users of the adjacent cells, improving the reliability of data transmission, and further improving the reliability of a communication network.
The cell has a plurality of first code words, and all the first code words can be transformed in the mode of the step 101 according to the conflict situation of the first code words to generate second code words; or, a part of the first code words may be transformed in the manner of step 101 to generate a second code word, so as to improve the flexibility of using the code word resources in the cell.
In an embodiment, a method for receiving data, referring to fig. 2, the method includes:
201. and generating a second code word which changes along with time according to the first code word.
The first code word is a logic code word allocated to a cell by a base station, the base station allocates a logic code word set according to time-frequency resources, the logic code word is allocated to a corresponding cell from the logic code word set, the cell allocates the logic code word to a user, and the logic code words of different cells in the range of one base station can be the same or different.
In this embodiment, the manner of generating the time-varying second codeword according to the first codeword may include the following two ways:
the method comprises the following steps:
taking the first code word and time as parameters of a first function, and performing first function transformation;
and taking the result of the first function transformation as a second code word.
Can use CodeIndexLogicRepresents a first codeword; time represents Time; CodeIndexphyRepresents a second codeword; other parameters, such as setting parameters of a cell and/or setting parameters of a user, etc.; the first function is represented by f (x, y, z), and the transformation relationship of the first function is: CodeIndexphy＝f(CodeIndexLogic，Time，Others)。
In this embodiment, the first function is a corresponding relationship between the first codeword and the second codeword, and may adopt a COSTAS array, an orthogonal Latin-square sequence, a hyperbolic congruence sequence, a hash function, a sine function, or the like. Therefore, even if the same first code words distributed by the users in different cells are converted by the first function, different second code words are obtained, so that the interference among the users in different cells can be avoided, and the reliability of data transmission between the users in different cells is improved.
The second mode comprises the following steps:
taking the first code word, the time and the cell number as parameters of a second function, and performing second function transformation;
and taking the result of the second function transformation as a second code word.
Can use CodeIndexLogicRepresents a first codeword; time represents Time; CellID denotes a cell number; CodeIndexphyRepresents a second codeword; other parameters, such as setting parameters of a cell and/or setting parameters of a user, etc.; the reaction is carried out with f (x,y, t, z) represents a first function, the first function transformation relationship is: CodeIndexphy＝f(CodeIndexLogic，Time，CellID，Others)。
In this embodiment, the second function is also a corresponding relationship between the first codeword and the second codeword, and can adopt a COSTAS array, an orthogonal Latin square sequence, a hyperbolic congruence sequence, a hash function, a sine function, or the like.
Even if different cell users distribute the same first code word, the second code word obtained after the second function transformation can not be always the same because the numbers of the different cell users as the second function parameters are different, so that the interference among the different cell users can be avoided, and the reliability of the data transmission of the different cell users can be improved.
202. Data is received.
203. And demodulating the data to obtain demodulated data.
The demodulation method corresponds to a method of modulating data when transmitting data, for example, when transmitting data, the data is modulated by fourier transform, and then the data is demodulated by inverse fourier transform; and modulating by adopting a fast Fourier transform mode, and demodulating by adopting an inverse fast Fourier transform during demodulation.
204. The demodulated data is despread with the second codeword.
There are various despreading methods corresponding to different spreading methods when data is transmitted.
Step 201 and step 202 may be performed simultaneously, step 201 may be performed before step 202, or step 201 may be performed after step 202.
The second code word used in data spreading and despreading corresponds to the second code word used in despreading, and the second code words corresponding to the first user and the second user are different, so that interference cannot be caused between data from the first user and data from the second user in the despreading process, and the safety and the reliability of data transmission are improved.
In a second embodiment, the data transmission method and the data reception method in the first embodiment may be applied to various communication networks, for example, a third generation mobile communication system (3G), a Local Multipoint Distributed Service (LMDS), a multipoint multichannel distributed system technology (MMDS), a Worldwide Interoperability for Microwave Access (WiMAX), and the like, and the data transmission method in the first embodiment is applied to a block-repeated orthogonal frequency division multiple access (BR-OFDMA) technology in the above communication networks.
Referring to fig. 3, the method for transmitting data in this embodiment includes:
301. data is received from a higher layer of the protocol layer.
302. Carrying out channel coding on the data to obtain coded data; the encoding may include puncturing and/or interleaving, etc.
303. The coded data is symbol-modulated, and the bit data stream is modulated into a symbol data stream to obtain symbol data, wherein the symbol modulation mode may include Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16 quadrature amplitude modulation (16QAM), 64QAM, or vestigial sideband modulation (VSB).
304. And carrying out blocking on the symbol data to generate unit block data.
305. Repeating the unit block data to obtain repeated data blocks, for example, repeating one data block A into four data blocks [ A, A, A, A ].
306. Generating a second codeword by using the first codeword, the cell number and the time as parameters of a second function, where in this embodiment, the first codeword is defined as a logical weighting factor sequence, and the second codeword is defined as a physical weighting factor sequence;
for example, referring to fig. 4, in the present embodiment, there are four cells Cell-0, Cell-1, Cell-2, and Cell-3, the second function is a COSTAS array, the second code word includes C1, C2, C3, and C4, and the first code word includes 0, 1, 2, and 3, and represents time horizontally. For the first Cell-0, the first codeword 0 corresponds to C1, C4, C2, C3 at different times, respectively; in Cell-2, the first codeword 3 corresponds to C1, C2, C4 and C3 at different times. The first codeword 0 of the first Cell-0 has only one codeword collision with the second codeword corresponding to the first codeword 3 of the third Cell-2.
307. The repeated data block is point-multiplied by the physical weighting factor sequence, that is, a certain data block is multiplied by an element at a position corresponding to the physical weighting factor sequence, so as to obtain a repeated block.
308. And distributing the repeated blocks to different subcarriers and time units through mapping to obtain mapped repeated blocks.
309. And modulating the mapping repetition block by Orthogonal Frequency Division Multiplexing (OFDM), namely, after inverse fast Fourier transform, adding a cyclic prefix to generate a time domain signal and sending the time domain signal.
Step 306 may be performed simultaneously with any of steps 301 to 305, or before any of steps 301 to 305, or after any of steps 301 to 305.
Third embodiment, the data transmission method in the first embodiment is applied to a variable length block spreading OFDMA (VBS-OFDMA) technique in a communication network.
Referring to fig. 5, the method for transmitting data in this embodiment includes:
501. data is received from a higher layer of the protocol layer.
502. Carrying out channel coding on the data to obtain coded data; the encoding may include puncturing and/or interleaving, etc.
503. The coded data is symbol-modulated, and the bit data stream is modulated into a symbol data stream to obtain symbol data, wherein the symbol modulation mode may include BPSK, QPSK, 16QAM, 64QAM, VSB, or the like.
504. The symbol data is divided to generate unit blocks.
505. And taking the first code word, the cell number and the time as parameters of a second function to generate a second code word, wherein in this embodiment, the first code word and the second code word are orthogonal spreading sequences respectively.
506. And multiplying each data element in the unit block by the corresponding second code word to perform orthogonal transformation spreading to obtain an orthogonal spreading sequence group.
507. And superposing the orthogonal spreading sequence groups and then mapping the superposed orthogonal spreading sequence groups onto physical subcarriers to obtain mapping data, wherein the mapping mode can adopt frequency domain mapping, time-frequency domain two-dimensional mapping or the like.
508. After the mapping data is subjected to serial-parallel conversion and OFDM modulation, namely after inverse fast Fourier transform, a cyclic prefix is added to generate a time domain signal, and the time domain signal is sent out.
In an embodiment, an apparatus for data transmission, referring to fig. 6, includes:
a code word generating unit 601, configured to generate a second code word that changes with time according to the first code word;
an extension unit 602, configured to extend the data with the second codeword to obtain extended data;
a modulating unit 603, configured to modulate the spread data to obtain modulated data;
a sending unit 604, configured to send the modulated data.
The code word generating unit and the expanding unit can be independently operated in two modules or can be integrated together.
The code word generating unit is configured to generate a second code word varying with time according to the first code word, and specifically may include:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and taking the first code word, the time and the code as parameters of a second function, and performing second function transformation to obtain a second code word.
The expanding unit is configured to expand the data by using the second codeword, and the obtaining of the expanded data may specifically include:
carrying out channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
carrying out blocking on the symbol data to generate unit block data;
repeating the cell block data to obtain repeated data blocks;
dot-multiplying the repeated data block by the second codeword.
Or, the expanding unit is configured to expand the data by using the second codeword, and obtaining the expanded data may specifically include:
carrying out channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
dividing the symbol data to generate a unit block;
each data element in the unit block is multiplied by a corresponding second codeword.
In an embodiment, an apparatus for receiving data, referring to fig. 7, the apparatus includes:
a codeword generating unit 701, configured to generate a second codeword that changes with time according to the first codeword;
a receiving unit 702, configured to receive data;
a demodulating unit 703, configured to demodulate data to obtain demodulated data;
a despreading unit 704 for despreading the demodulated data with the second codeword.
The codeword generating unit is configured to generate a second codeword that varies with time according to the first codeword, and specifically includes:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and taking the first code word, the time and the code as parameters of a second function, and performing second function transformation to obtain a second code word.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary hardware platform, and certainly may be implemented by hardware, but in many cases, the former is a better embodiment. With this understanding in mind, all or part of the technical solutions of the present invention that contribute to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments or some parts of the embodiments of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (15)
1. A method for data transmission, the method comprising:
generating a second code word which changes along with time according to the first code word;
expanding the data by using the second code word to obtain expanded data;
modulating the expanded data to obtain modulated data;
and transmitting the modulated data.
2. The method of claim 1, wherein generating a time-varying second codeword from a first codeword comprises:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and performing second function transformation by taking the first code word, the time and the cell number as parameters of a second function to obtain a second code word.
3. The method of claim 2, wherein: the first function is a COSTAS array or an orthogonal Latin square sequence or a hyperbolic congruence sequence, or the second function is a COSTAS array or an orthogonal Latin square sequence or a hyperbolic congruence sequence.
4. The method of claim 1, wherein the spreading data with the second codeword comprises:
performing channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
blocking the symbol data to generate unit block data;
repeating the unit block data to obtain repeated data blocks;
dot-multiplying the duplicate data block with the second codeword.
5. The method of claim 1, wherein the spreading data with the second codeword comprises:
performing channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
dividing the symbol data to generate a unit block;
each data element in the block of cells is multiplied by a corresponding second codeword.
6. A method of data reception, the method comprising:
generating a second code word which changes along with time according to the first code word;
receiving data;
demodulating the received data to obtain demodulated data;
despreading the demodulated data with the second codeword.
7. The method of claim 6, wherein generating a time-varying second codeword from the first codeword comprises:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and taking the first code word, the time and the cell number as parameters of a second function, and performing second function transformation to obtain a second code word.
8. The method of claim 7, wherein the first function is a COSTAS array or an orthogonal Latin square sequence or a hyperbolic congruential sequence, or wherein the second function is a COSTAS array or an orthogonal Latin square sequence or a hyperbolic congruential sequence.
9. An apparatus for data transmission, the apparatus comprising:
the code word generating unit is used for generating a second code word which changes along with time according to the first code word;
the extension unit is used for extending the data by using the second code word to obtain the extended data;
a modulation unit, configured to modulate the spread data to obtain modulated data;
and a transmitting unit, configured to transmit the modulated data.
10. The apparatus of claim 9, wherein the codeword generation unit and the extension unit are integrated.
11. The apparatus as claimed in claim 9, wherein the codeword generating unit is configured to generate the second codeword varying with time according to the first codeword specifically comprises:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and performing second function transformation by taking the first code word, the time and the code as parameters of a second function to obtain a second code word.
12. The apparatus according to claim 9, wherein the spreading unit is configured to spread the data by using the second codeword, and the obtaining the spread data specifically includes:
performing channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
blocking the symbol data to generate unit block data;
repeating the unit block data to obtain repeated data blocks;
dot-multiplying the duplicate data block with the second codeword.
13. The apparatus according to claim 9, wherein the spreading unit is configured to spread the data by using the second codeword, and the obtaining the spread data specifically includes:
performing channel coding on the data to obtain coded data;
carrying out symbol modulation on the coded data to obtain symbol data;
dividing the symbol data to generate a unit block;
each data element in the block of cells is multiplied by a corresponding second codeword.
14. An apparatus for data reception, the apparatus comprising:
the code word generating unit is used for generating a second code word which changes along with time according to the first code word;
a receiving unit for receiving data;
the demodulation unit is used for demodulating the data to obtain demodulated data;
a despreading unit for despreading the demodulated data with the second codeword.
15. The apparatus as claimed in claim 14, wherein the codeword generating unit is configured to generate the second codeword varying with time according to the first codeword, and specifically comprises:
taking the first code word and time as parameters of a first function, and performing first function transformation to obtain a second code word; or,
and performing second function transformation by taking the first code word, the time and the code as parameters of a second function to obtain a second code word.
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| EP1304813A1 (en) * | 2000-07-04 | 2003-04-23 | LinkAir Communications, Inc. | Method of converting spread spectrum multiple address code in a code division multiple access system |
| CN1707973A (en) * | 2004-06-10 | 2005-12-14 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1304813A1 (en) * | 2000-07-04 | 2003-04-23 | LinkAir Communications, Inc. | Method of converting spread spectrum multiple address code in a code division multiple access system |
| CN1707973A (en) * | 2004-06-10 | 2005-12-14 | 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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