CN108989257B - Data modulation method, device and storage medium - Google Patents

Data modulation method, device and storage medium Download PDF

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Publication number
CN108989257B
CN108989257B CN201710398831.2A CN201710398831A CN108989257B CN 108989257 B CN108989257 B CN 108989257B CN 201710398831 A CN201710398831 A CN 201710398831A CN 108989257 B CN108989257 B CN 108989257B
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data
sub
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CN108989257A (en
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辛雨
边峦剑
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a data modulation method, a device and a storage medium, wherein the method comprises the following steps: multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi; and respectively transmitting the 2N expanded data on 2 continuous subcarriers of the edge sub-band. The scheme of the invention can offset the side lobe amplitude between the subcarrier signals under the action of the spreading sequence to a large extent, thereby achieving the purpose of reducing out-of-band leakage; and, the repeated data transmission under the action of the spreading sequence can increase the signal to noise ratio, thereby improving the demodulation performance. Therefore, the technical scheme of the invention can effectively utilize the edge sub-band of the transmission frequency band and improve the frequency spectrum efficiency.

Description

Data modulation method, device and storage medium
Technical Field
The present invention relates to the field of multi-carrier wireless communications, and in particular, to a data modulation method, apparatus, and storage medium.
Background
The long term evolution (LTE, long Term Evolution) technology is a fourth generation (4G,Fourth Generation) wireless cellular communication technology. The LTE system introduces orthogonal frequency division multiplexing (OFDM, orthogonal Frequency Division Multiplexing) technology, and OFDM continues to be used in the fifth generation (5G,Fifth Generation) wireless cellular communication technology. However, the out-of-band leakage of the LTE system is relatively large, so that a frequency is often set aside from the edge of the transmission band as a guard interval, so as to reduce the influence of the out-of-band leakage on the adjacent band. Therefore, the waste of transmission frequency bands is not avoided to a certain extent, and the spectrum utilization efficiency is reduced.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention provide a data modulation method, apparatus, and storage medium for solving the foregoing problems.
According to an aspect of the present invention, there is provided a data modulation method, the method comprising:
multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
transmitting the 2N expanded data on 2N continuous subcarriers of the edge sub-band respectively; wherein N is a positive integer.
Optionally, N is 1, 2 or 3.
Optionally, when the N takes 1, the spreading sequence comprises [ C, C ]; when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ]; when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ]; wherein, C is a complex number.
Optionally, when the N is 2 or 3, the transmitting the 2N extended data on consecutive 2N subcarriers of the edge subband includes:
the 2N expanded data are sequentially sent on 2N continuous sub-carriers of the edge sub-band according to the sequence from outside to inside of the transmission band;
optionally, the transmitting the 2N expanded data sequentially on 2N subcarriers consecutive to the edge subband according to the order of the transmission band from outside to inside specifically includes:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
According to another aspect of the present invention, there is provided a data modulation apparatus comprising:
the modulation module is used for multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
a transmission module, configured to transmit the 2N extended data on 2N continuous subcarriers of the edge subband, respectively; wherein N is a positive integer.
Optionally, N is 1, 2 or 3.
Optionally, when the N takes 1, the spreading sequence comprises [ C, C ]; when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ]; when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ]; wherein, C is a complex number.
Optionally, when the N is 2 or 3, the transmission module is specifically configured to sequentially send the 2N extended data on 2N subcarriers consecutive to the edge subband according to an order of a transmission band from outside to inside.
Optionally, when the transmission module sequentially sends the 2N extended data on 2N subcarriers consecutive to the edge subband according to the order of the transmission frequency band from outside to inside, the method specifically includes:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
According to a third aspect of the present invention, there is provided a data modulation apparatus comprising: the data modulation method comprises the steps of a memory, a processor and a data modulation program which is stored in the memory and can run on the processor, wherein the data modulation program is executed by the processor, and the steps of the data modulation method are realized.
According to a fourth aspect of the present invention there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the data modulation method of the present invention.
The embodiment of the invention has the following beneficial effects:
the method, the device and the storage medium can greatly offset the side lobe amplitude among the subcarrier data under the action of the spreading sequence, thereby achieving the purpose of reducing out-of-band leakage; and, the repeated data transmission under the action of the spreading sequence can increase the signal to noise ratio, thereby improving the demodulation performance. Therefore, the technical scheme of the invention can effectively utilize the edge sub-band of the transmission frequency band and improve the frequency spectrum efficiency.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a flowchart of a data modulation method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a data modulation method according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of mapping data expanded by [1,1] to subcarriers in a second embodiment of the present invention;
fig. 4 is a schematic diagram of two consecutive subcarriers transmitting the same data according to a second embodiment of the present invention;
fig. 5 is a flowchart of a data modulation method according to a third embodiment of the present invention;
FIG. 6 is a diagram illustrating mapping of data to subcarriers after expansion by [1, -1, -1] in a third embodiment of the present invention;
FIG. 7 is a diagram illustrating mapping of data to subcarriers after expansion by [1, -1, -1] in a third embodiment of the present invention;
fig. 8 is a flowchart of a data modulation method according to a fourth embodiment of the present invention;
fig. 9 is a diagram showing mapping of data to subcarriers after expansion by [1, -1, -1, -1] in a fourth embodiment of the present invention;
fig. 10 is a schematic diagram of mapping data to subcarriers after being expanded by [1, -1, -1, -1] in a fourth embodiment of the present invention;
fig. 11 is a block diagram of a data modulation device according to a fifth embodiment of the present invention;
fig. 12 is a block diagram of a data modulation device according to a sixth embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The out-of-band leakage of the LTE system is relatively large, so that a transmission band edge is often set aside with a certain frequency as a guard interval, so as to reduce the influence of the out-of-band leakage on an adjacent band. Therefore, the waste of transmission frequency bands is not avoided to a certain extent, and the spectrum utilization efficiency is reduced. To this end, embodiments of the present invention provide a data modulation method, apparatus, and computer readable storage medium, which enable a multi-carrier system (refer to a system that uses multiple subcarriers to transmit data, such as an OFDM system) to effectively utilize an edge sub-band of a transmission band and control the influence of out-of-band leakage. The implementation of the invention is described in detail below by means of several specific examples.
In a first embodiment of the present invention, a data modulation method is provided, which is applicable to a transmitting node, which may be, but is not limited to: base station, terminal, relay, transmission point (transmitting point), etc.
As shown in fig. 1, the method comprises the steps of:
step S101, multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
step S102, the 2N extended data are sent on 2N continuous subcarriers of the edge subband, respectively.
In the embodiment of the present invention, the edge sub-band of the transmission band may be an edge sub-band of a single side of the transmission band or an edge sub-band of a double side of the transmission band. Specifically, when one end of the transmission band needs to control out-of-band leakage and the other end does not need to control out-of-band leakage, the edge sub-band refers to a unilateral edge sub-band, and at the moment, the data to be transmitted is multiplied by the spreading sequence on the edge sub-band on the side of controlling out-of-band leakage; when the two ends of the transmission band need to control the out-of-band leakage, the edge sub-bands are bilateral edge sub-bands, and at the moment, the data to be transmitted is multiplied by the spreading sequences on the edge sub-bands at the two ends of the transmission band. The edge sub-band includes p sub-carriers, p being an integer greater than or equal to 1.
Further, in the embodiment of the present invention, the data to be transmitted is digital modulation information such as binary phase shift keying (BPSK, binary Phase Shift Keying), quadrature phase shift keying (QPSK, quadrature Phase Shift Keyin), quadrature amplitude modulation (QAM, quadrature Amplitude Modulation), etc., and may also be in other data forms.
In the embodiment of the present invention, each two consecutive elements of the spreading sequence are a group, including: the 1 st element and the 2 nd element are a group, the 3 rd element and the 4 th element are a group, the 5 th element and the 6 th element are a group, … … is a group, and the 2N-1 nd element and the 2N element are a group.
In the embodiment of the invention, N is a positive integer. The larger the value of N is, the better the out-of-band leakage inhibition effect is, and the higher the signal to noise ratio is, but the data transmission efficiency is reduced along with the increase of the value of N. Therefore, the person skilled in the art can flexibly set the value of N according to specific requirements. In one embodiment of the present invention, let N take 1, 2 or 3.
Further, in one embodiment of the present invention,
when N takes 1, let the extension sequence be [ C, C ];
when N is 2, let the extension sequence be [ C, C, -C, -C ];
when N is 3, let the extension sequence be [ C, C, -C, -C, -C ];
wherein C is a plurality.
Further, in the embodiment of the present invention, when the N is 2 or 3, the sending the 2N extended data on the consecutive 2N subcarriers of the edge subband includes:
and transmitting the 2N expanded data on the 2N continuous subcarriers of the edge sub-band sequentially according to the transmission frequency band from outside to inside.
Specifically, the transmitting the 2N extended data sequentially on 2N subcarriers consecutive to the edge subband according to the order of the transmission band from outside to inside includes:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
It should be noted that, the above method steps in the embodiment of the present invention are directed to any processing procedure of data to be transmitted, when there are a plurality of data to be transmitted, for example, there are currently K data to be transmitted, where K is an integer greater than 1, and one way to send the data to be transmitted at this time is as follows:
on the edge sub-band of the transmission band, the K data to be transmitted are multiplied by the spreading sequences, respectively, to obtain K groups of spread data (each group having 2N spread data). And taking the continuous 2N sub-carriers as a group, and respectively transmitting the K groups of expanded data on the continuous K groups of sub-carriers of the edge sub-band.
As can be seen from the above, according to the method of the embodiment of the present invention, the data to be transmitted is modulated by using the spreading sequence, so as to obtain modulated 2N data, and the modulated 2N data are respectively transmitted on continuous 2N subcarriers, so that the side lobe amplitudes between the 2N subcarrier signals can be substantially offset, and the purpose of reducing out-of-band leakage is achieved; and, the repeated data transmission under the action of the spreading sequence can increase the signal to noise ratio, thereby improving the demodulation performance. Therefore, the scheme of the embodiment of the invention can effectively utilize the edge sub-bands of the transmission frequency band and improve the frequency spectrum efficiency.
In a second embodiment of the present invention, a data modulation method is provided, which is a specific implementation of the method described in the first embodiment. Specifically, as shown in fig. 2, the method includes the following steps:
step S201, multiplying the data to be transmitted by a spreading sequence [1,1] on the edge sub-band of the transmission frequency band to obtain two spread data;
in the embodiment of the present invention, the edge sub-band of the transmission band may be an edge sub-band of a single side of the transmission band or an edge sub-band of a double side of the transmission band. Specifically, in the embodiment of the present invention, when one end of a transmission band needs to control out-of-band leakage and the other end does not need to control out-of-band leakage, the edge sub-band refers to a single-side edge sub-band, and at this time, on the edge sub-band on the side of controlling out-of-band leakage, data to be transmitted is multiplied by a spreading sequence [1,1]; when the two ends of the transmission band need to control the out-of-band leakage, the edge sub-bands refer to bilateral edge sub-bands, and at this time, the data to be transmitted is multiplied by the spreading sequences [1,1] on the edge sub-bands at the two ends of the transmission band.
Step S202, transmitting the two expanded data on two continuous subcarriers of the edge sub-band respectively.
In one embodiment of the present invention, there are K to be transmittedData [ S 1 S 2 S 3 …S K ]At the same time, K data to be transmitted S are on the edge sub-band of the transmission band 1 S 2 S 3 …S K ]Multiplying by spreading sequences [1, respectively]Obtaining K groups of expanded data S 1 S 1 ]、[S 2 S 2 ]…[S K S K ]. With two continuous sub-carriers as one group, the data after the expansion of the K groups are respectively sent on the continuous K groups of sub-carriers of the edge sub-band, namely [ S ] 1 S 1 ]Transmitted on subcarriers 1, 2, [ S ] 2 S 2 ]Transmitted on subcarriers 3, 4, [ S ] 3 S 3 ]Transmitting … … [ S ] on subcarriers 5,6 K S K ]Transmitted on subcarriers 2K-1, 2K as shown in particular in fig. 3.
The method provided by the embodiment of the invention can reduce the out-of-band leakage of the edge sub-band. As shown in fig. 4, the horizontal axis represents frequency, the vertical axis represents amplitude, and the horizontal broken line in the figure represents a reference line with amplitude 0. The data to be transmitted is multiplied by the [1,1] spreading sequence and then is sent on two continuous subcarriers, namely subcarrier 1 and subcarrier 2 send the same data, so that the signal side lobes of the two subcarriers can be offset greatly positively and negatively, and the effect of inhibiting out-of-band leakage is achieved. And, two continuous subcarriers send the same data, can improve the signal to noise ratio of maximum 2 times.
In a third embodiment of the present invention, a data modulation method is provided, where the embodiment is a specific implementation of the method described in the first embodiment. Specifically, as shown in fig. 5, the method includes the following steps:
step S501, multiplying the data to be transmitted by a spreading sequence [1, -1, -1] on the edge sub-band of the transmission band to obtain four spread data;
in the embodiment of the present invention, the edge sub-band of the transmission band may be an edge sub-band of a single side of the transmission band or an edge sub-band of a double side of the transmission band. Specifically, in the embodiment of the present invention, when one end of a transmission band needs to control out-of-band leakage and the other end does not need to control out-of-band leakage, the edge sub-band refers to a single-side edge sub-band, and at this time, on the edge sub-band on the side of controlling out-of-band leakage, data to be transmitted is multiplied by a spreading sequence [1, -1]; when the two ends of the transmission band need to control the out-of-band leakage, the edge sub-bands refer to bilateral edge sub-bands, and at the moment, the data to be transmitted is multiplied by the spreading sequences [1, -1] on the edge sub-bands at the two ends of the transmission band.
Step S502, transmitting the four expanded data on four continuous subcarriers of the edge sub-band respectively.
In a specific embodiment of the invention, on the edge sub-band, the data to be transmitted is multiplied by a spreading sequence [1, -1, -1], which is transmitted sequentially on consecutive 4 sub-carriers in the order of the transmission band from outside to inside.
Specifically, when the low frequency side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1], and is sequentially transmitted on 4 continuous sub-carriers according to the sequence from low frequency to high frequency; when the high frequency end side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1], and is sequentially transmitted on 4 continuous sub-carriers according to the sequence from high frequency to low frequency.
In a further embodiment of the invention, the data to be transmitted is multiplied by the spreading sequence 1, -1, -1 on the edge sub-band, and may be transmitted on consecutive 4 sub-carriers in order from low frequency to high frequency.
Specifically, when the low frequency side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1], and is sequentially transmitted on 4 continuous sub-carriers according to the sequence from low frequency to high frequency; when the high frequency side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1], and sequentially transmitted on 4 continuous sub-carriers according to the sequence from low frequency to high frequency.
In one embodiment of the present invention, there are K data to be transmitted S 1 S 2 S 3 …S K ]At the edge of the transmission bandOn the sub-band, K data to be transmitted S 1 S 2 S 3 …S K ]Multiplied by spreading sequences 1, -1, respectively]Obtaining K groups of expanded data S 1 S 1 -S 1 -S 1 ]、[S 2 S 2 -S 2 -S 2 ]…[S K S K -S K -S K ]. With four continuous sub-carriers as a group, the data after the expansion of the K groups are respectively sent on the continuous K groups of sub-carriers of the edge sub-band, namely [ S ] 1 S 1 -S 1 -S 1 ]Transmitted on subcarriers 1, 2, 3, 4, [ S ] 2 S 2 -S 2 -S 2 ]Transmitting … … [ S ] on subcarriers 5,6, 7, 8 K S K -S K -S K ]Transmitted on subcarriers 4K-3, 4K-2, 4K-1, 4K. When the edge sub-band is the edge sub-band of the low frequency end of the transmission band, mapping from the K groups of expanded data to sub-carriers is shown in fig. 6; when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the mapping of the K groups of expanded data to sub-carriers is shown in fig. 7.
In the embodiment of the invention, the spreading sequence [1, -1, -1] achieves the effect of inhibiting out-of-band leakage through the side lobe cancellation of 4 continuous subcarrier signals, and has better effect of inhibiting out-of-band leakage than the spreading sequence [1,1] in the same way as the side lobe cancellation of the subcarrier in the second embodiment. And, the data is repeatedly transmitted under the action of the extension sequence [1, -1, -1], so that the maximum 4 times of the receiving signal-to-noise ratio can be improved.
In a fourth embodiment of the present invention, a data modulation method is provided, which is a specific implementation of the method described in the first embodiment. Specifically, as shown in fig. 8, the method includes the following steps:
step S801, multiplying the data to be transmitted by a spreading sequence [1, -1, -1, -1, -1] on the edge sub-band of the transmission band to obtain six spread data;
in the embodiment of the present invention, the edge sub-band of the transmission band may be an edge sub-band of a single side of the transmission band or an edge sub-band of a double side of the transmission band. Specifically, in the embodiment of the present invention, when one end of a transmission band needs to control out-of-band leakage and the other end does not need to control out-of-band leakage, the edge sub-band refers to a single-sided edge sub-band, and at this time, on the edge sub-band on the side of controlling out-of-band leakage, data to be transmitted is multiplied by a spreading sequence [1, -1, -1, -1]; when the out-of-band leakage needs to be controlled at both ends of the transmission band, the edge sub-band refers to a bilateral edge sub-band, and at this time, the data to be transmitted is multiplied by the spreading sequence [1, -1, -1, -1] on the edge sub-band at both ends of the transmission band.
Step S802, transmitting the six extended data on the six consecutive subcarriers of the edge subband respectively.
In the embodiment of the invention, on the edge sub-band, the data to be transmitted is multiplied by the spreading sequence [1, -1, -1, -1], and is sequentially transmitted on the continuous 6 sub-carriers according to the order of the transmission frequency bands from outside to inside.
Specifically, when the low frequency side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1, -1], and is sequentially transmitted on 6 continuous sub-carriers according to the sequence from low frequency to high frequency; when the high frequency side of the transmission band needs to control out-of-band leakage, the data to be transmitted on the corresponding edge sub-band is multiplied by a spreading sequence [1, -1, -1, -1], and is sequentially transmitted on 6 continuous sub-carriers according to the sequence from high frequency to low frequency.
In the embodiment of the present invention, K data to be transmitted [ S ] are on the edge sub-band of the transmission band 1 S 2 S 3 …S K ]Multiplied by spreading sequences 1, -1, -1, respectively]Obtaining K groups of expanded data S 1 S 1 -S 1 -S 1 -S 1 -S 1 ]、[S 2 S 2 -S 2 -S 2 -S 2 -S 2 ]…[S K S K -S K -S K -S K -S K ]. With the continuous six sub-carriers as a group, the data after the K groups of expansion are respectively sent on the continuous K groups of sub-carriers of the edge sub-band, namely [ S ] 1 S 1 -S 1 -S 1 -S 1 -S 1 ]Transmitted on subcarriers 1, 2, 3, 4, 5,6, [ S ] 2 S 2 -S 2 -S 2 -S 2 -S 2 ]Transmitting … … [ S ] on subcarriers 7, 8, 9, 10, 11, 12 K S K -S K -S K -S K -S K ]Transmitted on subcarriers 6K-5, 6K-6, 6K-3, 6K-2, 6K-1, 6K. When the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the mapping of the K groups of expanded data to sub-carriers is shown in fig. 9. When the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the mapping of the K groups of expanded data to sub-carriers is shown in fig. 10.
In the embodiment of the invention, the spreading sequences [1, -1, -1, -1] achieve the effect of inhibiting out-of-band leakage through the side lobe cancellation of 6 continuous subcarrier signals, and have better out-of-band leakage inhibition effect than the spreading sequences [1,1] and [1, -1, -1] in the same way as the side lobe cancellation of the subcarrier in the second embodiment. And, the data is repeatedly transmitted under the action of the spreading sequence [1, -1, -1, -1], so that the maximum 6 times of receiving signal-to-noise ratio can be improved.
In a fifth embodiment of the present invention, there is provided a data modulation apparatus, as shown in fig. 11, including:
a modulation module 1110, configured to multiply, on an edge subband of the transmission band, data to be transmitted by a spreading sequence with a length of 2N, to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
a transmission module 1120, configured to send the 2N extended data on 2N consecutive subcarriers of the edge subband, respectively; wherein N is a positive integer. Optionally, N is 1, 2 or 3.
In one embodiment of the invention:
when N is 1, the spreading sequence comprises [ C, C ];
when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ];
when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ];
wherein, C is a complex number.
Further, in a specific embodiment of the present invention, when the N is 2 or 3, the transmission module 1120 is specifically configured to sequentially send the 2N extended data on 2N subcarriers consecutive to the edge subband according to an order of transmission frequency bands from outside to inside.
The method for transmitting the 2N expanded data sequentially on 2N continuous subcarriers of the edge subband according to the sequence of the transmission frequency band from outside to inside specifically includes:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
In the embodiment of the present invention, the modulation module 1110 and the transmission module 1120 may exist as functional modules of a processor in the device, and the spreading sequences and algorithms required for the operation of the modulation module and the transmission module are stored in the memory of the device.
As can be seen from the above, the device according to the embodiment of the present invention modulates data to be transmitted by using a spreading sequence to obtain modulated 2N data, and transmits the modulated 2N data on consecutive 2N subcarriers, so that the side lobe amplitudes between the 2N subcarrier signals can be substantially offset, thereby achieving the purpose of reducing out-of-band leakage; and, the repeated data transmission under the action of the spreading sequence can increase the signal to noise ratio, thereby improving the demodulation performance. Therefore, the scheme of the embodiment of the invention can effectively utilize the edge sub-bands of the transmission frequency band and improve the frequency spectrum efficiency.
In a sixth embodiment of the present invention, there is provided a data modulation apparatus, as shown in fig. 12, including: memory 1210, processor 1220, and a computer program stored on the memory 1210 and executable on the processor 1220, when executing the computer program, performing the steps of:
multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
transmitting the 2N expanded data on 2N continuous subcarriers of the edge sub-band respectively; wherein N is a positive integer. Alternatively, N is 1, 2 or 3.
In one embodiment of the invention:
when N is 1, the spreading sequence comprises [ C, C ];
when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ];
when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ];
wherein, C is a complex number.
Further, in a specific embodiment of the present invention, when the N is 2 or 3, the transmitting the 2N extended data on consecutive 2N subcarriers of the edge subband includes:
the 2N expanded data are sequentially sent on 2N continuous sub-carriers of the edge sub-band according to the sequence from outside to inside of the transmission band;
the method for transmitting the 2N expanded data sequentially on 2N continuous subcarriers of the edge subband according to the sequence of the transmission frequency band from outside to inside specifically includes:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
As can be seen from the above, the device according to the embodiment of the present invention modulates data to be transmitted by using a spreading sequence to obtain modulated 2N data, and transmits the modulated 2N data on consecutive 2N subcarriers, so that the side lobe amplitudes between the 2N subcarrier signals can be substantially offset, thereby achieving the purpose of reducing out-of-band leakage; and, the repeated data transmission under the action of the spreading sequence can increase the signal to noise ratio, thereby improving the demodulation performance. Therefore, the scheme of the embodiment of the invention can effectively utilize the edge sub-bands of the transmission frequency band and improve the frequency spectrum efficiency.
In a seventh embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which program, when being executed by a processor, carries out the method steps according to any of the first to fourth embodiments.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular for the device embodiments, the description is relatively simple, since it is substantially similar to the method embodiments, as relevant to the description of the method embodiments.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. A method of data modulation, the method comprising:
multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
transmitting the 2N expanded data on 2N continuous subcarriers of the edge sub-band respectively; wherein N is a positive integer.
2. The method of claim 1, wherein,
when N is 1, the spreading sequence comprises [ C, C ];
when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ];
when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ];
wherein, C is a complex number.
3. The method of claim 2, wherein when the N is taken to be 2 or 3, the transmitting the 2N expanded data on consecutive 2N subcarriers of the edge subband, respectively, comprises:
and transmitting the 2N expanded data on the 2N continuous subcarriers of the edge sub-band sequentially according to the transmission frequency band from outside to inside.
4. The method of claim 3, wherein said transmitting the 2N spread data sequentially over the 2N subcarriers consecutive to the edge subbands in an outside-in order of transmission band comprises:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
5. A data modulation apparatus, comprising:
the modulation module is used for multiplying the data to be transmitted by a spreading sequence with the length of 2N on an edge sub-band of a transmission frequency band to obtain 2N spread data; wherein each two continuous elements of the spreading sequence are a group, the phase difference of the two elements in the group is zero, and the phase difference of the elements between the groups is zero or pi;
a transmission module, configured to transmit the 2N extended data on 2N continuous subcarriers of the edge subband, respectively; wherein N is a positive integer.
6. The apparatus of claim 5, wherein,
when N is 1, the spreading sequence comprises [ C, C ];
when said N takes 2, said spreading sequence comprises [ C, C, -C, -C ];
when said N takes 3, said spreading sequence comprises [ C, C, -C, -C, -C ];
wherein, C is a complex number.
7. The apparatus of claim 6, wherein when the N is 2 or 3, the transmission module is configured to sequentially transmit the 2N extended data on 2N subcarriers consecutive to the edge subband in an order of transmission band from outside to inside.
8. The apparatus of claim 7, wherein the transmission module, when transmitting the 2N extended data sequentially over the 2N subcarriers consecutive to the edge subbands in an outside-in order of transmission band, comprises:
when the edge sub-band is the edge sub-band of the low frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from low frequency to high frequency;
and when the edge sub-band is the edge sub-band of the high frequency end of the transmission band, the 2N expanded data are sequentially transmitted on 2N continuous sub-carriers of the edge sub-band according to the sequence from high frequency to low frequency.
9. A data modulation apparatus, comprising: a memory, a processor and a data modulation program stored on said memory and executable on said processor, said processor implementing the steps of the method according to any one of claims 1 to 4 when said data modulation program is executed.
10. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, implements the steps of the data modulation method according to any one of claims 1 to 4.
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