CN102916926A - Data sending method, restoring method and device - Google Patents

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

Data sending method, restoring method and device

technical field

The present invention relates to the communication field, in particular, to a data sending method, a restoration method and a device.

Background technique

Wireless Local Area Networks (WLAN) is the application of wireless communication technology to interconnect computer equipment to form a network system that can communicate with each other and realize resource sharing. The essential feature of WLAN is that it no longer uses communication cables to connect computers to the network, but connects them wirelessly, so that the construction of the network and the movement of terminals are more flexible. IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) 802.11 is one of the mainstream technologies of wireless local area networks at present. This protocol mainly specifies the physical layer (PHY) and media access control (MAC, Media Access Control) layer specifications.

In response to various network requirements, the IEEE802.11 group of the Institute of Electrical and Electronics Engineers established a series of standard WLAN technologies such as 802.11a, 802.11b, 802.11g, and 802.11n, and then other task groups emerged one after another. Committed to the development of specifications involving the improvement of existing 802.11 technologies, for example, the newly established 802.11ah task group, whose main task is to modify and enhance the MAC layer and PHY layer of WLAN, so as to adapt to smart grid (SmartGrid), environmental agriculture Monitoring (Environmental/Agricultural Monitoring), industrial process automation (Industrial Process Automation) and other network requirements.

After the baseband data signal is modulated by the constellation, it can be represented by I and Q two-way components, the I-way is the in-phase component, and the Q-way is the quadrature component. These two components are orthogonal and independent of each other. In the QAM (Quadrature Amplitude Modulation, Quadrature Amplitude Modulation) modulator, the I and Q signals come from a signal source with the same amplitude and frequency. The only difference is that the phase of the Q signal is 90 degrees different from the I signal.

Due to the application requirements of 802.11ah technology, it requires high coverage and reliability. However, the current data transmission method only performs simple repeated mapping, resulting in relatively low reliability of data transmission, which cannot meet the above requirements.

For the problem of relatively low reliability of the data sending method in the related art, no effective solution has been proposed yet.

Contents of the invention

The main purpose of the present invention is to provide a data sending method, restoration method and device, so as to at least solve the problem of relatively low reliability of the above-mentioned data sending method.

According to one aspect of the present invention, a data transmission method is provided, including: modulating the data to be transmitted to obtain a modulation symbol; wherein, the modulation symbol is represented by two components of I and Q; mapping the modulation symbol to the first designator On the carrier segment; after performing I and Q channel swapping, the modulation symbols are mapped on the second specified sub-carrier segment; and the mapped modulation symbols are sent.

The above-mentioned mapping of modulation symbols on the second specified subcarrier segment after the I and Q exchange of the modulation symbols includes: performing the I and Q exchange of the modulation symbols; converting the exchanged modulation symbols according to the set method, converting The subsequent modulation symbols are mapped to the second designated subcarrier segment.

The above setting method includes at least one of the following: taking a conjugate of the swapped modulation symbol; taking a negative of the swapped modulation symbol; rotating the phase of the swapped modulation symbol by a specified angle.

The modulation mode adopted for modulating the data to be transmitted includes one of the following: QPSK, 16QAM, 64QAM or 256QAM.

Before sending the mapped modulation symbols, the method further includes: mapping the modulation symbols to carrier segments other than the first designated sub-carrier segment and the second designated sub-carrier segment.

According to another aspect of the present invention, a method for restoring data is provided, including: demodulating the modulation symbols received on the first designated sub-carrier segment; performing I, Q modulation on the modulation symbols received on the second designated sub-carrier segment Demodulate after channel swapping; perform symbol collection and processing on the demodulated modulation symbols, and restore them to the original data.

According to yet another aspect of the present invention, a data transmission device is provided, including: a modulation module, configured to modulate the data to be transmitted to obtain a modulation symbol; wherein, the modulation symbol is represented by two components of I and Q; the first mapping The module is used to map the modulation symbol modulated by the modulation module on the first designated subcarrier segment; the second mapping module is used to map the modulation symbol modulated by the modulation module to the second designated subcarrier after performing I and Q exchange On the band; a sending module, configured to send the modulation symbols mapped by the first mapping module and the second mapping module.

Above-mentioned second mapping module comprises: exchange unit, is used for carrying out I, Q road interchange with modulation symbol; Conversion unit, is used to convert the modulation symbol after the exchange unit exchange according to setting mode; Mapping unit, uses The modulation symbol converted by the conversion unit is mapped to the second designated sub-carrier segment.

The conversion unit above includes at least one of the following: a first conversion subunit, configured to conjugate the modulated symbols after swapping;

The second conversion subunit is used to take the negative of the swapped modulation symbols; the third conversion subunit is used to rotate the phases of the swapped modulation symbols by a specified angle.

According to another aspect of the present invention, a data restoration device is provided, including: a first demodulation module, which demodulates the modulation symbols received on the first designated subcarrier segment; a second demodulation module, which demodulates the second designated subcarrier segment The modulation symbols received on the sub-carrier segment are demodulated after I and Q channel swapping; the restoration module performs symbol collection and processing on the demodulated modulation symbols, and restores them to original data.

Through the present invention, by mapping the modulated modulation symbols on different sub-carrier segments, and exchanging the I and Q paths of the modulation symbols during the mapping process, the diversity gain of the I and Q paths can be brought, and then compensation The distortion caused by attenuation during data transmission solves the problem of low reliability of existing data transmission and obtains better frequency diversity effect.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flow chart of a data sending method according to Embodiment 1 of the present invention;

2 is a flowchart of a data restoration method according to Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of data mapping according to Example 1 of the present invention;

Fig. 4 is a schematic diagram of data mapping according to Example 2 of the present invention;

Fig. 5 is a schematic diagram of data mapping according to Example 3 of the present invention;

Fig. 6 is a schematic diagram of data mapping according to Example 4 of the present invention;

FIG. 7 is a structural block diagram of a data sending device according to Embodiment 2 of the present invention;

FIG. 8 is a specific structural block diagram of a data sending device according to Embodiment 2 of the present invention;

Fig. 9 is a structural block diagram of a data restoration device according to Embodiment 2 of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

In the embodiment of the present invention, during data transmission, the modulated symbols are repeatedly mapped, and the modulated symbols are swapped between I and Q paths during the repeated mapping process, so as to achieve better gain for the I and Q paths .

Example 1

This embodiment provides a method for sending data, which can be implemented on any sending device. As shown in Figure 1, the method includes the following steps (step S102 to step S108):

Step S102, modulating the data to be transmitted to obtain a modulation symbol; wherein, the modulation symbol is represented by two components of I and Q;

Wherein, the modulation method adopted in this embodiment refers to complex frequency domain digital baseband modulation methods such as QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying), 16QAM, 64QAM, 256QAM;

Step S104, mapping the modulation symbols on the first specified subcarrier segment;

Step S106, mapping the modulation symbols to the second designated subcarrier segment after I and Q path swapping;

For example, N modulated symbols are sequentially mapped to N subcarrier segments; each of the N modulated symbols is mapped to another M subcarrier segments after performing I and Q exchange, where M and N are natural numbers.

Step S108, sending the above mapped modulation symbols.

In this embodiment, by mapping the modulated modulation symbols on different subcarrier segments, and exchanging the I and Q paths of the modulation symbols during the mapping process, the diversity gain of the I and Q paths can be brought, and the data can be compensated. The distortion caused by attenuation in the transmission process solves the problem of low reliability of existing data transmission, obtains better frequency diversity effect, and enhances the security of the system.

In order to further enhance the reliability, in this embodiment, in the process of mapping the modulation symbols on the second designated subcarrier segment after the I and Q paths are swapped, it is also possible to use: perform the I and Q paths swapping of the modulation symbols; according to The setting method converts the exchanged modulation symbols, and maps the converted modulation symbols on the second designated subcarrier segment. Wherein, the setting method includes at least one of the following: taking a conjugate of the swapped modulation symbol; taking a negative of the swapped modulation symbol; and rotating the phase of the swapped modulation symbol by a specified angle. For example, the modulated symbols can be conjugated and/or negated when the I and Q paths are interchanged. Alternatively, phase rotation may be performed when the modulated symbol I and Q channels are swapped and then mapped to subcarriers. Among them, taking the negative of the modulation symbol after I and Q exchange as an example, if the modulation symbol is a+bi, after performing I and Q exchange, it is b+ai, and then taking the negative is "-(b+ai )".

In order to obtain a better frequency diversity effect, the above-mentioned modulation symbols can also be mapped multiple times. Based on this, before the above-mentioned sending of the mapped modulation symbols, the method further includes: mapping the modulation symbols on the first designated subcarrier segment and On a carrier segment other than the second specified sub-carrier segment. In this way, the reliability of data transmission will be further improved and a better frequency diversity effect will be obtained.

Through the above-mentioned mapping processing, the conversion mode can be flexibly selected according to actual needs, so as to enhance the reliability of data transmission.

Regarding the above data sending method, this embodiment also provides a data restoration method, which can be implemented on any receiving device, such as a terminal. Referring to Fig. 2, the method comprises the following steps (step S202 to step S206):

Step S202, demodulating the modulation symbols received on the first specified subcarrier segment;

The demodulation method can select a method corresponding to the modulation method adopted by the sending end for demodulation;

Step S204, demodulating the modulation symbols received on the second designated subcarrier segment after I and Q path swapping;

In step S206, the demodulated modulation symbols are combined into symbol sets to restore the original data.

Wherein, the merging processing of symbol sets can be realized by referring to related technologies, and details are not repeated here.

In this embodiment, the received modulation symbols are demodulated, and during the demodulation process, the I and Q exchange operations are carried out corresponding to the symbol conversion at the sending end, so that the original data can be accurately restored, and the existing data transmission problem is solved. The problem of low reliability is solved, and a better frequency diversity effect is obtained. In addition, the symbol-level combination performed by the receiving end in this embodiment has relatively low complexity and is easy to implement.

With regard to the above data sending method, the specific modulation symbol mapping process will be described in detail below by taking the IEEE802.11 system as an example.

Example 1

As shown in Figure 3, there are _Nd /2 modulated symbols in this example, where _Nd is the number of data subcarriers that each OFDM (Orthogonal FrequencyDivision Multiplex, Orthogonal Frequency Division Multiplex) symbol contains, and the modulation method is For QPSK modulation, the first modulation symbol is a ₁ + b ₁ i, the second modulation symbol is a ₂ + b ₂ i, and accordingly until the N _d /2th modulation symbol.

The N _d /2 modulated symbols are directly mapped on the [1, N _d /2] subcarrier segment, specifically, the first modulation symbol is mapped to the first subcarrier of positive frequency, and the second modulation symbol It is mapped to the second subcarrier of the positive frequency, and N _d /2 modulation symbols are respectively mapped to 1 to N _d /2 subcarriers according to this method.

Then the N _d /2 modulated symbols are exchanged for I and Q channels and then mapped to the [-N _d /2, -1] subcarrier segment, specifically the first modulation symbol a ₁ +b ₁ i Perform I and Q exchange, get b ₁ +a ₁ i, and map it to the negative frequency -N _d /2 subcarrier, the second modulation symbol a ₂ +b ₂ i is used for I and Q exchange, Get b ₂ +a ₂ i, and map it to the -N _d /2+1 subcarrier of the negative frequency part, and map N _d /2 I, Q-way interchanged modulation symbols to -N in this way _d /2 to -1 subcarriers.

Example 2, as shown in Figure 4, has modulated symbols N _d /4, where N _d is the number of data subcarriers contained in each OFDM symbol, the modulation method is 16QAM modulation, and the first modulation symbol is a ₁ + b ₁ i, the second modulation symbol is a ₂ + b ₂ i, correspondingly up to the N _d /4th modulation symbol.

Do direct mapping of the N _d /4 modulated symbols on the [1, N _d /4] subcarrier segment, the first modulation symbol is mapped to the first subcarrier of the positive frequency, and the second modulation symbol is mapped to the positive frequency On the second subcarrier of frequency, N _d /4 modulation symbols are mapped to 1 to N _d /4 subcarriers in this way.

Then directly map the N _d /4 modulated symbols on the [N _d /4+1, N _d /2] subcarrier segment, and map the first modulation symbol to the positive frequency N _d /4+1 subcarrier , the second modulation symbol is mapped to positive frequency N _d /4+2 subcarriers, and N _d /4 modulation symbols are mapped to N _d /4+1 to N _d /2 subcarriers in this way.

Then the N _d /4 modulated symbols are exchanged for I and Q channels and then mapped on the [-N _d /4, -1] subcarrier segment, and the first modulation symbol a ₁ +b ₁ i is used as The I and Q channels are interchanged to obtain b ₁ +a ₁ i, map it to the negative frequency -N _d /4th subcarrier, and rotate the phase of the subcarrier 180 degrees counterclockwise, the second modulation symbol a ₂ +b ₂ i is exchanged between I and Q to obtain b ₂ +a ₂ i, map it to the -N _d /4+1 subcarrier of the negative frequency part, and rotate the subcarrier phase counterclockwise by 90 degrees , according to this method, N _d /4 I, Q channel swapped modulation symbols are mapped to -N _d /4 to -1 subcarriers, and at the same time, the phase of the kth subcarrier is rotated counterclockwise

Then the N _d /4 modulated symbols are exchanged for I and Q channels and then mapped on the [-N _d /2, -N _d /4-1] subcarrier segment, and the first modulation symbol a ₁ +b ₁ i is used to exchange the I and Q channels to obtain b ₁ +a ₁ i, map it to the -N _d /2th subcarrier of negative frequency, and rotate the subcarrier phase counterclockwise by 90 degrees, and the second A modulation symbol a ₂ +b ₂ i is exchanged between I and Q, and b ₂ +a ₂ i is obtained, which is mapped to the -N _d /2+1 subcarrier of the negative frequency part, and the phase of the subcarrier is Rotate 270 degrees counterclockwise. In this way, N _d /4 I and Q-way interchanged modulation symbols are mapped to -N _d /2 to -N _d /4+1 subcarriers, and the kth subcarrier The phase of the counterclockwise

Example 3, as shown in Figure 5, has modulated symbols N _d /4, where N _d is the number of data subcarriers contained in each OFDM symbol, the modulation method is 16QAM modulation, and its first modulation symbol is a ₁ + b ₁ i, the second modulation symbol is a ₂ + b ₂ i, correspondingly up to the N _d /4th modulation symbol.

Do direct mapping of the N _d /4 modulated symbols on the [1, N _d /4] subcarrier segment, the first modulation symbol is mapped to the first subcarrier of the positive frequency, and the second modulation symbol is mapped to the positive frequency On the second subcarrier of frequency, N _d /4 modulation symbols are mapped to 1 to N _d /4 subcarriers in this way.

Then, the N _d /4 modulated symbols are mapped on the [N _d /4+1, N _d /2] subcarrier segment after I and Q exchange, and the first modulation symbol a ₁ +b ₁ i Perform I and Q exchange, get b ₁ +a ₁ i, map it to the positive frequency N _d /4+1 subcarrier, and use the second modulation symbol a ₂ +b ₂ i as I, Q exchange Change, get b ₂ +a ₂ i, and map it to the N _d /4+2 subcarriers of the positive frequency part, and map N _d /4 I, Q-way interchanged modulation symbols to N _d /4+1 to N _d /2 subcarriers.

Then the N _d /4 modulated symbols are directly mapped on the [-N _d /4, -1] subcarrier segment, the first modulation symbol is mapped to the negative frequency -N _d /4 subcarrier, and the second modulation symbols are mapped to negative frequency -N _d /4+1 subcarriers, and N _d /4 modulation symbols are mapped to -N _d /4 to -1 subcarriers in this way.

Then, the N _d /4 modulated symbols are mapped on the [-N _d /2, -N _d /4-1] subcarrier segment after I and Q exchange, and the first modulation symbol a ₁ + b ₁ i is used for I and Q exchange, and b ₁ + a ₁ i is obtained, which is mapped to the negative frequency -N _d /2 subcarrier, and the second modulation symbol a ₂ + b ₂ i is used as I and Q In this way, b ₂ +a ₂ i is obtained and mapped to the -N _d /2+1 subcarrier of the negative frequency part. In this way, N _d /4 modulation symbols of I and Q channels are exchanged Mapped onto -N _d /2 to -N _d /4+1 subcarriers. and do phase rotation.

Example 4

As shown in Figure 6, there are N _d /4 modulated symbols, where N _d is the number of data subcarriers contained in each OFDM symbol, the modulation method is 16QAM modulation, and the first modulation symbol is a ₁ + b ₁ i, the second modulation symbol is a ₂ +b ₂ i, and so on until the N _d /4th modulation symbol.

The N _d /4 modulated symbols are directly mapped to the [1, N _d /4] subcarrier segment, the first modulation symbol is mapped to the first subcarrier of the positive frequency, and the second modulation symbol is mapped to the positive frequency On the second subcarrier of frequency, N _d /4 modulation symbols are mapped to 1 to N _d /4 subcarriers in this way.

Then directly map the N _d /4 modulated symbols on the [N _d /4+1, N _d /2] subcarrier segment, and map the first modulation symbol to the positive frequency N _d /4+1 subcarrier , the second modulation symbol is mapped to positive frequency N _d /4+2 subcarriers, and N _d /4 modulation symbols are mapped to N _d /4+1 to N _d /2 subcarriers in this way.

Then, the N _d /4 modulated symbols are mapped on the [-N _d /4, -1] subcarrier segment after the I and Q channels are exchanged, and when the I and Q channels are exchanged, they are negative, and the first A modulation symbol a ₁ +b ₁ i is exchanged for I and Q channels and taken negative to obtain -b ₁ -a ₁ i, which is mapped to the negative frequency -N _d /4th subcarrier, and the second modulation The symbol a ₂ +b ₂ i is exchanged for I and Q channels and taken negative to obtain -b ₂ -a ₂ i, which is mapped to the -N _d /4+1 subcarrier of the negative frequency part, according to this method N _d /4 I and Q channels are swapped and negative modulation symbols are mapped to -N _d /4 to -1 subcarriers.

Then the N _d /4 modulated symbols are mapped on the [-N _d /2, -N _d /4-1] subcarrier segment after the I and Q channels are exchanged, and when the I and Q channels are exchanged Take the conjugate, exchange the first modulation symbol a ₁ +b ₁ i with the I and Q channels and take the conjugate to get b ₁ -a ₁ i, and map it to the negative frequency -N _d /2 subcarrier In the above, the second modulation symbol a ₂ +b ₂ i is exchanged by I and Q channels and conjugated to obtain b ₂ -a ₂ i, which is mapped to the -N _d /2+1 subcarrier of the negative frequency part In this way, N _d /4 modulation symbols with I and Q channels interchanged and conjugated are mapped to -N _d /2 to -N _d /4+1 subcarriers.

Example 2

This embodiment provides a data sending device, referring to Figure 7, the device includes the following modules:

The modulation module 72 is used to modulate the data to be sent to obtain modulation symbols; wherein, the modulation symbols are represented by I and Q components;

Wherein, the modulation method adopted in this embodiment includes one of the following: QPSK, 16QAM, 64QAM or 256QAM;

The first mapping module 74 is connected to the modulation module 72, and is used for mapping the modulation symbols modulated by the modulation module 72 on the first specified subcarrier segment;

The second mapping module 76 is connected to the modulation module 72, and is used for mapping the modulation symbols modulated by the modulation module 72 on the second designated subcarrier segment after I and Q path swapping;

The sending module 78 is connected to the first mapping module 74 and the second mapping module 76 and configured to send the modulation symbols mapped by the first mapping module 74 and the second mapping module 76 .

In this embodiment, by mapping the modulated modulation symbols on different subcarrier segments, and exchanging the I and Q paths of the modulation symbols during the mapping process, the diversity gain of the I and Q paths can be brought, and the data can be compensated. The distortion caused by attenuation in the transmission process solves the problem of low reliability of existing data transmission and obtains better frequency diversity effect.

In order to enhance reliability, this embodiment also provides a specific implementation of a data sending device. Referring to FIG. 8, the device includes the following modules: a modulation module 72, a first mapping module 74, a second mapping module 76 and a sending module 78 , its function is the same as that in Fig. 7, the difference is that the second mapping module 76 includes: an exchange unit 762, which is used to exchange the I and Q paths of the modulation symbols; a conversion unit 764, which is connected with the exchange unit 762, and uses The modulation symbols swapped by the swapping unit 762 are converted according to the setting method; the mapping unit 766 is connected to the converting unit 764 and configured to map the modulation symbols converted by the converting unit 764 on the second designated subcarrier segment.

The conversion unit includes at least one of the following units: a first conversion subunit, which is used to conjugate the modulated symbol after the swap; a second conversion subunit, which is used to take the negative of the modulated symbol after the swap; a third conversion subunit The unit is used to rotate the phase of the swapped modulation symbols by a specified angle.

This embodiment also provides a data restoration device, see Figure 9, the device includes the following modules:

The first demodulation module 92 demodulates the modulation symbols received on the first specified subcarrier segment;

The second demodulation module 94 is connected with the first demodulation module 92, and demodulates the modulated symbols received on the second designated subcarrier segment after I and Q path swapping;

The restoration module 96 is connected to the first demodulation module 92 and the second demodulation module 94, and carries out symbol collection and processing on the demodulated modulation symbols, and restores them to original data.

In order to obtain a better frequency diversity effect, the above-mentioned data sending device further includes: a repeated mapping module, configured to map modulation symbols on carrier segments other than the first designated sub-carrier segment and the second designated sub-carrier segment. In this way, the reliability of data transmission will be further improved and a better frequency diversity effect will be obtained.

The above-mentioned data restoration device demodulates the received modulation symbols, and during the demodulation process, performs I and Q exchange operations corresponding to the symbol conversion at the sending end, and can accurately restore the original data, solving the problem of existing data The problem of low transmission reliability is solved, and a better frequency diversity effect is obtained, and the complexity of the symbol-level combination performed by the device is relatively low, and it is easy to implement.

From the above description, it can be seen that the above embodiment maps the modulated modulation symbols to different sub-carrier segments, swaps the I and Q paths of the modulation symbols during the mapping process, and maps the converted modulation symbols to on the specified subcarrier. The diversity gain of the I and Q channels can be enhanced, and then the distortion caused by attenuation in the data transmission process can be compensated, the problem of low reliability of the existing data transmission is solved, and a better frequency diversity effect is obtained.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the 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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