CN102916926A - Data sending method, data restoring method and device - Google Patents
Data sending method, data restoring method and device Download PDFInfo
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- CN102916926A CN102916926A CN2011102237253A CN201110223725A CN102916926A CN 102916926 A CN102916926 A CN 102916926A CN 2011102237253 A CN2011102237253 A CN 2011102237253A CN 201110223725 A CN201110223725 A CN 201110223725A CN 102916926 A CN102916926 A CN 102916926A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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Abstract
The invention discloses a data sending method, a data restoring method and a device. The data sending method comprises the following steps: modulating data to be sent to obtain a modulation symbol, wherein the modulation symbol is represented by an I (in-phase) component and a Q (quadrature) component; mapping the modulation symbol onto a first appointed sub-carrier band; mapping the modulation symbol onto a second appointed sub-carrier band after interchange of the I component and the Q component; and sending the mapped modulation symbol. Through the data sending method, the data restoring method and the device, the problem that the conventional data sending method is relatively low in reliability is solved; and a better frequency diversity effect is achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of data transmission method for uplink, method of reducing and device.
Background technology
WLAN (Wireless Local Area Networks, WLAN) is that the employing wireless communication technology is interconnected with computer equipment, and the network system of resource-sharing can be communicated by letter mutually and realize to formation.The characteristics of WLAN (wireless local area network) essence are not re-use telecommunication cable computer and network is coupled together, but connect by wireless mode, thereby make the movement of the structure of network and terminal more flexible.IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) the 802.11st, one of mainstream technology of present WLAN (wireless local area network), this agreement is mainly stipulated physical layer (PHY) and media access control (MAC, Media Access Control) layer standard.
Be reply diverse network demand, Institute of Electrical and Electric Engineers industrial specification IEEE802.11 composition has found 802.11a, 802.11b, 802.11g, 802.11n etc. the prevailing WLAN technology of series of standards, other task groups have appearred again subsequently successively, be devoted to develop the standard that relates to existing 802.11 technological improvements, for example, just set up 802.11ah task groups soon, its main task is exactly that the MAC layer of WLAN and PHY layer are made amendment and strengthened, in order to adapt to intelligent grid (Smart Grid), fo environmental agriculture monitoring (Environmental/Agricultural Monitoring), the demand of the networks such as industrial process automation (Industrial Process Automation).
Base-band data signal can be used I, Q two-way representation in components after modulating through constellation, and the I road is in-phase component, and the Q road is quadrature component.These two components are quadratures, and irrelevant mutually.I and Q signal are from a signal source in QAM (Quadrature Amplitude Modulation, the quadrature amplitude modulation) modulator, and amplitude is all identical with frequency, unique different be that phase place and the I signal of Q signal differs 90 degree.
Because the application requirements of 802.11ah technology is so that it is higher to large covering and reliability requirement.And only carry out simple repeating mapping in the data receiver formula at present, and cause the reliability ratio of transfer of data lower, can not satisfy above-mentioned requirements.
The lower problem of reliability ratio for the data receiver formula in the correlation technique not yet proposes effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of data transmission method for uplink, method of reducing and device, with the lower problem of reliability ratio that solves at least above-mentioned data receiver formula.
According to an aspect of the present invention, provide a kind of data transmission method for uplink, having comprised: modulated to sent data, obtain modulation symbol; Wherein, modulation symbol is by I, Q two-way representation in components; Modulation symbol is mapped in first specifies on the sub-carrier section; Modulation symbol is carried out being mapped on the second appointment sub-carrier section after I, the exchange of Q road; Send the modulation symbol after shining upon.
Above-mentionedly modulation symbol is carried out being mapped in after I, Q road exchange second specify on the sub-carrier section and comprise: with modulation symbol carry out I, the Q road exchanges; According to setting means the modulation symbol after exchanging is changed, the modulation symbol after the conversion is mapped in second specifies on the sub-carrier section.
It is one of following that above-mentioned setting means comprises at least: the modulation symbol after exchanging is got conjugation; Get negative to the modulation symbol after exchanging; Phase rotating specified angle with the modulation symbol after exchanging.
It is one of following that above-mentioned modulation system of modulating employing to sent data comprises: QPSK, 16QAM, 64QAM or 256QAM.
Before the modulation symbol after the above-mentioned transmission mapping, method also comprises: modulation symbol is mapped on the first carrier wave section of specifying sub-carrier section and the second appointment sub-carrier section.
According to a further aspect in the invention, provide a kind of data restoration method, having comprised: specified the modulation symbol that receives on the sub-carrier section to carry out demodulation to first; Specify the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second; Modulation symbol after the demodulation is carried out glossary of symbols merge processing, be reduced to initial data.
According to another aspect of the invention, provide a kind of data sending device, having comprised: modulation module, be used for modulating to sent data, obtain modulation symbol; Wherein, modulation symbol is by I, Q two-way representation in components; The first mapping block is used for the modulation symbol of modulation module modulation is mapped in the first appointment sub-carrier section; The second mapping block is used for the modulation symbol of modulation module modulation is carried out being mapped in the second appointment sub-carrier section after I, the exchange of Q road; Sending module is used for the modulation symbol after transmission the first mapping block and the second mapping block shine upon.
Above-mentioned the second mapping block comprises: exchange unit is used for modulation symbol is carried out I, the exchange of Q road; Converting unit is changed for the modulation symbol after according to setting means exchange unit being exchanged; Map unit is used for that the modulation symbol after the converting unit conversion is mapped in second and specifies sub-carrier section.
It is one of following that above-mentioned converting unit comprises at least: the first conversion subelement is used for the modulation symbol after exchanging is got conjugation;
The second conversion subelement is used for getting negative to the modulation symbol after exchanging; The 3rd conversion subelement, the phase rotating specified angle of the modulation symbol after being used for exchanging.
In accordance with a further aspect of the present invention, provide a kind of data recovery device, having comprised: the first demodulation module, specify the modulation symbol that receives on the sub-carrier section to carry out demodulation to first; The second demodulation module specifies the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second; Recovery module is carried out glossary of symbols with the modulation symbol after the demodulation and is merged processing, is reduced to initial data.
By the present invention, modulation symbol after employing will be modulated is mapped on the different sub-carrier section, and in mapping process, the I of modulation symbol, Q road are exchanged, can bring the diversity gain on I, Q road, and then the distortion that causes because of decay in can the offset data transmission course, solve the lower problem of available data transmission reliability, and obtained better frequency diversity effect.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the data transmission method for uplink flow chart according to the embodiment of the invention 1;
Fig. 2 is the data restoration method flow chart according to the embodiment of the invention 1;
Fig. 3 is the data-mapping schematic diagram of the example 1 according to the present invention;
Fig. 4 is the data-mapping schematic diagram of the example 2 according to the present invention;
Fig. 5 is the data-mapping schematic diagram of the example 3 according to the present invention;
Fig. 6 is the data-mapping schematic diagram of the example 4 according to the present invention;
Fig. 7 is the structured flowchart according to the data sending device of the embodiment of the invention 2;
Fig. 8 is the concrete structure block diagram according to the data sending device of the embodiment of the invention 2;
Fig. 9 is the structured flowchart according to 2 data recovery device of the embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.
The embodiment of the invention is carried out repeating mapping to modulated symbol when carrying out the data transmission, and in the repeating mapping process modulated symbol is carried out I, the exchange of Q road, with realization is gained better in I, Q road.
The present embodiment provides a kind of data transmission method for uplink, and the method can realize at any transmitting apparatus.As shown in Figure 1, the method may further comprise the steps (step S102 is to step S108):
Step S102 modulates to sent data, obtains modulation symbol; Wherein, modulation symbol is by I, Q two-way representation in components;
Wherein, the modulation system of the present embodiment employing refers to the complex frequency domain digital baseband modulation systems such as QPSK (Quadrature Phase Shift Keying, quarternary phase-shift keying (QPSK)), 16QAM, 64QAM, 256QAM;
Step S104 is mapped in first with modulation symbol and specifies on the sub-carrier section;
Step S106 carries out modulation symbol to be mapped on the second appointment sub-carrier section after I, the exchange of Q road;
For example, N modulated symbols is mapped on N the sub-carrier section successively; Described each N modulated symbols is being mapped on the other M sub-carrier section after I, Q road exchange, M wherein, N is natural number.
Step S108 sends the modulation symbol after the above-mentioned mapping.
The present embodiment is mapped on the different sub-carrier section by the modulation symbol after will modulating, and in mapping process, the I of modulation symbol, Q road are exchanged, can bring the diversity gain on I, Q road, and then the distortion that causes because of decay in can the offset data transmission course, solved the lower problem of available data transmission reliability, and obtained better frequency diversity effect, strengthened Security of the system.
In order further to strengthen reliability, the present embodiment is mapped in the second process of specifying on the sub-carrier section after modulation symbol being carried out I, the exchange of Q road, can also adopt: modulation symbol is carried out I, the exchange of Q road; According to setting means the modulation symbol after exchanging is changed, the modulation symbol after the conversion is mapped in second specifies on the sub-carrier section.Wherein, this setting means comprises one of following at least: the modulation symbol after exchanging is got conjugation; Get negative to the modulation symbol after exchanging; And, with the phase rotating specified angle of the modulation symbol after exchanging.For example, modulated symbols can be got conjugation and/or get negative when I, the exchange of Q road.Can carry out phase rotating when perhaps, modulated symbols I, Q road being exchanged backward subcarrier mapping.Wherein, negative as example so that the modulation symbol after I, the exchange of Q road is got, if modulation symbol is a+bi, carrying out after I, the exchange of Q road is b+ai, gets to bear to be " (b+ai) " again.
In order to obtain better frequency diversity effect, also can repeatedly shine upon above-mentioned modulation symbol, based on this, before the modulation symbol after the above-mentioned transmission mapping, the method also comprises: modulation symbol is mapped on the first carrier wave section of specifying sub-carrier section and the second appointment sub-carrier section.Like this, will further improve the reliability of transfer of data and obtain better frequency diversity effect.
Process by above-mentioned mapping, can choose flexibly according to actual needs mapping mode, to strengthen the reliability of transfer of data.
For above-mentioned data transmission method for uplink, the present embodiment also provides a kind of data restoration method, and the method can realize at any one receiving equipment, such as terminal etc.Referring to Fig. 2, the method may further comprise the steps (step S202 is to step S206):
Step S202 specifies the modulation symbol that receives on the sub-carrier section to carry out demodulation to first;
Mode corresponding to modulation system that this demodulation mode can be selected to adopt with transmitting terminal carried out demodulation;
Step S204 specifies the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second;
Step S206 carries out glossary of symbols with the modulation symbol after the demodulation and merges processing, is reduced to initial data.
Wherein, glossary of symbols merges to be processed and can realize with reference to correlation technique, repeats no more here.
The present embodiment is by carrying out demodulation to the modulation symbol that receives, and in demodulating process, corresponding symbol transition with transmitting terminal has been carried out I, the Q road exchanges operation, can restore exactly initial data, solve the lower problem of available data transmission reliability, and obtained better frequency diversity effect, and, the complexity that the symbol level that the present embodiment receiving terminal carries out merges is also lower, is easy to realize.
For above-mentioned data transmission method for uplink, the below describes concrete modulation symbol mapping process in detail take the IEEE802.11 system as example.
Example 1
As shown in Figure 3, modulated symbols N is arranged in this example
d/ 2, N wherein
dBe the data subcarrier number that each OFDM (Orthogonal Frequency Division Multiplex, OFDM) symbol comprises, modulation system is the QPSK modulation, and its first modulation symbol is a
1+ b
1I, second modulation symbol is a
2+ b
2I is correspondingly until N
d/ 2 modulation symbols.
With this N
d/ 2 modulated symbols are at [1, N
d/ 2] sub-carrier section is done directly to shine upon, and is specially first modulation symbol is mapped on first subcarrier of positive frequency, and second modulation symbol is mapped on second subcarrier of positive frequency, according to such method with N
d/ 2 modulation symbols are mapped to respectively 1 to N
dOn/2 subcarriers.
Again with this N
dAfter doing I, the exchange of Q road ,/2 modulated symbols shine upon again [N
d/ 2 ,-1] on the sub-carrier section, is specially first modulation symbol a
1+ b
1I makes I, the Q road exchanges, and obtains b
1+ a
1I is mapped to negative frequency-N with it
dOn/2 subcarriers, second modulation symbol a
2+ b
2I makes I, the Q road exchanges, and obtains b
2+ a
2I, with its be mapped to negative frequency part-N
dOn/2+1 the subcarrier, according to such method with N
dThe modulation symbol that/2 I, Q road exchange is mapped to-N
dOn/2 to-1 subcarriers.
Example 2 has modulated symbols N as shown in Figure 4
d/ 4, N wherein
dBe the data subcarrier number that each OFDM symbol comprises, modulation system is the 16QAM modulation, and its first modulation symbol is a
1+ b
1I, second modulation symbol is a
2+ b
2I is correspondingly until N
d/ 4 modulation symbols.
With this N
d/ 4 modulated symbols are at [1, N
d/ 4] sub-carrier section is done direct mapping, and first modulation symbol is mapped on first subcarrier of positive frequency, and second modulation symbol is mapped on second subcarrier of positive frequency, according to such method with N
d/ 4 modulation symbols are mapped to 1 to N
dOn/4 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 4+1, N
d/ 2] sub-carrier section is done directly mapping, and first modulation symbol is mapped to positive frequency N
dOn/4+1 the subcarrier, second modulation symbol is mapped to positive frequency N
dOn/4+2 the subcarrier, according to such method with N
d/ 4 modulation symbols are mapped to N
d/ 4+1 is to N
dOn/2 subcarriers.
Again with this N
dAfter doing I, the exchange of Q road ,/4 modulated symbols are mapped in again [N
d/ 4 ,-1] on the sub-carrier section, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges, and obtains b
1+ a
1I is mapped to negative frequency the-N with it
dOn/4 subcarriers, and with this sub-carrier phase be rotated counterclockwise 180 the degree, second modulation symbol a
2+ b
2I makes I, the Q road exchanges, and obtains b
2+ a
2I, with its be mapped to negative frequency part-N
dOn/4+1 the subcarrier, and with this sub-carrier phase be rotated counterclockwise 90 the degree, according to such method with N
dThe modulation symbol that/4 I, Q road exchange is mapped to-N
dOn/4 to-1 subcarriers, simultaneously the phase place of k subcarrier is revolved counterclockwise
Again with this N
dAfter doing I, the exchange of Q road ,/4 modulated symbols are mapped in again [N
d/ 2 ,-N
d/ 4-1] on the sub-carrier section, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges, and obtains b
1+ a
1I is mapped to negative frequency the-N with it
dOn/2 subcarriers, and with this sub-carrier phase be rotated counterclockwise 90 the degree, second modulation symbol a
2+ b
2I makes I, the Q road exchanges, and obtains b
2+ a
2I, with its be mapped to negative frequency part-N
dOn/2+1 the subcarrier, and with this sub-carrier phase be rotated counterclockwise 270 the degree, according to such method with N
dThe modulation symbol that/4 I, Q road exchange is mapped to-N
d/ 2 arrive-N
dOn/4+1 the subcarrier, the phase place with k subcarrier is rotated counterclockwise simultaneously
Example 3 has modulated symbols N as shown in Figure 5
d/ 4, N wherein
dBe the data subcarrier number that each OFDM symbol comprises, modulation system is the 16QAM modulation, and its first modulation symbol is a
1+ b
1I, second modulation symbol is a
2+ b
2I is correspondingly until N
d/ 4 modulation symbols.
With this N
d/ 4 modulated symbols are at [1, N
d/ 4] sub-carrier section is done direct mapping, and first modulation symbol is mapped on first subcarrier of positive frequency, and second modulation symbol is mapped on second subcarrier of positive frequency, according to such method with N
d/ 4 modulation symbols are mapped to 1 to N
dOn/4 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 4+1, N
d/ 2] sub-carrier section is made I, the Q road is shone upon after exchanging, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges, and obtains b
1+ a
1I is mapped to positive frequency N with it
dOn/4+1 the subcarrier, second modulation symbol a
2+ b
2I makes I, the Q road exchanges, and obtains b
2+ a
2I is mapped to the N of positive frequency part with it
dOn/4+2 the subcarrier, according to such method with N
dThe modulation symbol that/4 I, Q road exchange is mapped to N
d/ 4+1 is to N
dOn/2 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 4 ,-1] do directly mapping on the sub-carrier section, first modulation symbol is mapped to negative frequency-N
dOn/4 subcarriers, second modulation symbol is mapped to negative frequency-N
dOn/4+1 the subcarrier, according to such method with N
d/ 4 modulation symbols are mapped to-N
dOn/4 to-1 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 2 ,-N
d/ 4-1] make I, Q road on the sub-carrier section and exchange after mapping, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges, and obtains b
1+ a
1I is mapped to negative frequency the-N with it
dOn/2 subcarriers, second modulation symbol a
2+ b
2I makes I, the Q road exchanges, and obtains b
2+ a
2I, with its be mapped to negative frequency part-N
dOn/2+1 the subcarrier, according to such method with N
dThe modulation symbol that/4 I, Q road exchange is mapped to-N
d/ 2 arrive-N
dOn/4+1 the subcarrier.And do phase rotating.
Example 4
As shown in Figure 6, modulated symbols N is arranged
d/ 4, N wherein
dBe the data subcarrier number that each OFDM symbol comprises, modulation system is the 16QAM modulation, and its first modulation symbol is a
1+ b
1I, second modulation symbol is a
2+ b
2I, by that analogy, until N
d/ 4 modulation symbols.
With this N
d/ 4 modulated symbols are at [1, N
d/ 4] sub-carrier section is done directly to shine upon, and first modulation symbol is mapped on first subcarrier of positive frequency, and second modulation symbol is mapped on second subcarrier of positive frequency, according to such method with N
d/ 4 modulation symbols are mapped to 1 to N
dOn/4 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 4+1, N
d/ 2] sub-carrier section is done directly mapping, and first modulation symbol is mapped to positive frequency N
dOn/4+1 the subcarrier, second modulation symbol is mapped to positive frequency N
dOn/4+2 the subcarrier, according to such method with N
d/ 4 modulation symbols are mapped to N
d/ 4+1 is to N
dOn/2 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 4 ,-1] make I, Q road on the sub-carrier section and exchange after mapping, and I, get when the Q road exchanges negative, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges and it is negative to get, and obtains-b
1-a
1I is mapped to negative frequency the-N with it
dOn/4 subcarriers, second modulation symbol a
2+ b
2I makes I, the Q road exchanges and it is negative to get, and obtains-b
2-a
2I, with its be mapped to negative frequency part-N
dOn/4+1 the subcarrier, according to such method with N
d/ 4 I, Q roads exchange and get negative modulation symbol and are mapped to-N
dOn/4 to-1 subcarriers.
Again with this N
d/ 4 modulated symbols are at [N
d/ 2 ,-N
d/ 4-1] make I, Q road on the sub-carrier section and exchange after mapping, and at I, get conjugation when the Q road exchanges, with first modulation symbol a
1+ b
1I makes I, the Q road exchanges and get conjugation, obtains b
1-a
1I is mapped to negative frequency the-N with it
dOn/2 subcarriers, second modulation symbol a
2+ b
2I makes I, the Q road exchanges and get conjugation, obtains b
2-a
2I, with its be mapped to negative frequency part-N
dOn/2+1 the subcarrier, according to such method with N
dThe modulation symbol that/4 I, Q road exchanged and got conjugation is mapped to-N
d/ 2 arrive-N
dOn/4+1 the subcarrier.
The present embodiment provides a kind of data sending device, and referring to Fig. 7, this device comprises with lower module:
Modulation module 72 is used for modulating to sent data, obtains modulation symbol; Wherein, modulation symbol is by I, Q two-way representation in components;
Wherein, the modulation system that adopts of the present embodiment comprises one of following: QPSK, 16QAM, 64QAM or 256QAM;
The first mapping block 74 links to each other with modulation module 72, is used for the modulation symbol of modulation module 72 modulation is mapped in the first appointment sub-carrier section;
The second mapping block 76 links to each other with modulation module 72, is used for the modulation symbol of modulation module 72 modulation is carried out being mapped in the second appointment sub-carrier section after I, the exchange of Q road;
Sending module 78 links to each other with the second mapping block 76 with the first mapping block 74, is used for the modulation symbol after transmission the first mapping block 74 and the second mapping block 76 shine upon.
The present embodiment is mapped on the different sub-carrier section by the modulation symbol after will modulating, and in mapping process, the I of modulation symbol, Q road are exchanged, can bring the diversity gain on I, Q road, and then the distortion that causes because of decay in can the offset data transmission course, solve the lower problem of available data transmission reliability, and obtained better frequency diversity effect.
In order to strengthen reliability, the present embodiment also provides a kind of specific implementation of data sending device, referring to Fig. 8, this device comprises with lower module: modulation module 72, the first mapping block 74, the second mapping block 76 and sending module 78, its function is identical with Fig. 7, difference is, the second mapping block 76 comprises: exchange unit 762, be used for to modulation symbol carry out I, the Q road exchanges; Converting unit 764 links to each other with exchange unit 762, changes for the modulation symbol after according to setting means exchange unit 762 being exchanged; Map unit 766 links to each other with converting unit 764, is used for that the modulation symbol after converting unit 764 conversions is mapped in second and specifies sub-carrier section.
Converting unit comprises at least with one of lower unit: the first conversion subelement is used for the modulation symbol after exchanging is got conjugation; The second conversion subelement is used for getting negative to the modulation symbol after exchanging; The 3rd conversion subelement, the phase rotating specified angle of the modulation symbol after being used for exchanging.
The present embodiment also provides a kind of data recovery device, and referring to Fig. 9, this device comprises with lower module:
The first demodulation module 92 specifies the modulation symbol that receives on the sub-carrier section to carry out demodulation to first;
The second demodulation module 94 links to each other with the first demodulation module 92, specifies the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second;
Recovery module 96 links to each other with the second demodulation module 94 with the first demodulation module 92, the modulation symbol after the demodulation is carried out glossary of symbols merge processing, is reduced to initial data.
In order to obtain better frequency diversity effect, above-mentioned data sending device also comprises: the repeating mapping module, and for the carrier wave section that modulation symbol is mapped in except the first appointment sub-carrier section and second is specified sub-carrier section.Like this, will further improve the reliability of transfer of data and obtain better frequency diversity effect.
Above-mentioned data recovery device is by carrying out demodulation to the modulation symbol that receives, and in demodulating process, corresponding symbol transition with transmitting terminal has been carried out I, the Q road exchanges operation, can restore exactly initial data, solve the lower problem of available data transmission reliability, and obtained better frequency diversity effect, and, the complexity that the symbol level that this device carries out merges is also lower, is easy to realize.
Above-described embodiment is mapped on the different sub-carrier section by the modulation symbol after will modulating as can be seen from the above description, and I, Q road with modulation symbol in mapping process exchange, and the modulation symbol after the conversion is mapped on the subcarrier of appointment.Can strengthen the diversity gain on I, Q road, and then the distortion that causes because of decay in can the offset data transmission course, solve the lower problem of available data transmission reliability, and obtained better frequency diversity effect.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a data transmission method for uplink is characterized in that, comprising:
Modulate to sent data, obtain modulation symbol; Wherein, described modulation symbol is by I, Q two-way representation in components;
Described modulation symbol is mapped in first specifies on the sub-carrier section;
Described modulation symbol is carried out being mapped on the second appointment sub-carrier section after I, the exchange of Q road;
Send the described modulation symbol after shining upon.
2. method according to claim 1 is characterized in that, describedly described modulation symbol is carried out being mapped in after I, Q road exchange second specifies on the sub-carrier section and comprises:
Described modulation symbol is carried out I, the exchange of Q road;
According to setting means the described modulation symbol after exchanging is changed, the described modulation symbol after the conversion is mapped in second specifies on the sub-carrier section.
3. method according to claim 2 is characterized in that, it is one of following that described setting means comprises at least:
Described modulation symbol after exchanging is got conjugation;
Get negative to the described modulation symbol after exchanging;
Phase rotating specified angle with the described modulation symbol after exchanging.
4. method according to claim 1 is characterized in that, it is one of following that described modulation system of modulating employing to sent data comprises:
Quarternary phase-shift keying (QPSK) QPSK, 16 quadrature amplitude modulation QAM, 64QAM or 256QAM.
5. method according to claim 1 is characterized in that, before the described modulation symbol after the described transmission mapping, described method also comprises:
Described modulation symbol is mapped in except described first specifies sub-carrier section and described second to specify on the carrier wave section the sub-carrier section.
6. a data restoration method is characterized in that, comprising:
Specify the modulation symbol that receives on the sub-carrier section to carry out demodulation to first;
Specify the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second;
Modulation symbol after the demodulation is carried out glossary of symbols merge processing, be reduced to initial data.
7. a data sending device is characterized in that, comprising:
Modulation module is used for modulating to sent data, obtains modulation symbol; Wherein, described modulation symbol is by I, Q two-way representation in components;
The first mapping block is used for the described modulation symbol of described modulation module modulation is mapped in the first appointment sub-carrier section;
The second mapping block is used for the described modulation symbol of described modulation module modulation is carried out being mapped in the second appointment sub-carrier section after I, the exchange of Q road;
Sending module is for the described modulation symbol that sends after described the first mapping block and described the second mapping block shine upon.
8. device according to claim 7 is characterized in that, described the second mapping block comprises:
Exchange unit is used for described modulation symbol is carried out I, the exchange of Q road;
Converting unit is changed for the described modulation symbol after according to setting means described exchange unit being exchanged;
Map unit is used for that the described modulation symbol after the described converting unit conversion is mapped in second and specifies sub-carrier section.
9. device according to claim 8 is characterized in that, it is one of following that described converting unit comprises at least:
The first conversion subelement is used for the described modulation symbol after exchanging is got conjugation;
The second conversion subelement is used for getting negative to the described modulation symbol after exchanging;
The 3rd conversion subelement, the phase rotating specified angle of the described modulation symbol after being used for exchanging.
10. a data recovery device is characterized in that, comprising:
The first demodulation module specifies the modulation symbol that receives on the sub-carrier section to carry out demodulation to first;
The second demodulation module specifies the modulation symbol that receives on the sub-carrier section to carry out I, the rear demodulation of Q road exchange to second;
Recovery module is carried out glossary of symbols with the modulation symbol after the demodulation and is merged processing, is reduced to initial data.
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| CN2011102237253A CN102916926A (en) | 2011-08-05 | 2011-08-05 | Data sending method, data restoring method and device |
| PCT/CN2012/074520 WO2012155763A1 (en) | 2011-08-05 | 2012-04-23 | Data sending method, restoring method and device |
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| WO2005122421A1 (en) * | 2004-06-10 | 2005-12-22 | Matsushita Electric Industrial Co., Ltd. | Cdma communication apparatus and cdma communication method |
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