CN105391672A - LTE-based multicarrier modulation system - Google Patents
LTE-based multicarrier modulation system Download PDFInfo
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- CN105391672A CN105391672A CN201510982210.XA CN201510982210A CN105391672A CN 105391672 A CN105391672 A CN 105391672A CN 201510982210 A CN201510982210 A CN 201510982210A CN 105391672 A CN105391672 A CN 105391672A
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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
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
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Abstract
The present invention provides an LTE-based multicarrier modulation system, which adopts two-stage multicarrier modulation and demodulation. The LTE-based multicarrier modulation system has the beneficial technical effects that the frequency spectrum efficiency and the data transmissibility of an LTE system are guaranteed, the secrecy performance is greatly enhanced, and hardware costs and realization difficulties are reduced.
Description
Technical Field
The invention relates to secret communication, in particular to a multi-carrier modulation system based on LTE.
Background
In future mobile communication systems, high-bandwidth and high-rate data services are indispensable, which requires that wireless communication technologies effectively eliminate adverse effects of wireless channel fading on transmission, achieve higher spectrum efficiency, and simultaneously consider equality among users.
LTE (long term evolution) is a long term evolution of the UMTS (universal mobile telecommunications system) technical standard established by the 3GPP (third generation partnership project) organization. The LTE system introduces key transmission technologies such as OFDM and MIMO, and the frequency spectrum efficiency and the data transmission rate are obviously increased; and to achieve diversity multiplexing gain, LTE systems are also increasingly transmitting using multicarrier and dynamic modulation techniques.
However, the problem is that the original single channel or single carrier modulation technique cannot meet the requirement of multi-carrier secret communication, and therefore, a multi-carrier modulation scheme suitable for LTE needs to be provided.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
According to an embodiment of the present invention, an LTE-based multi-carrier modulation system is provided, which includes: an LTE multicarrier transmitter and an LTE multicarrier receiver,
the LTE multicarrier transmitter performs multicarrier modulation on a multicarrier signal to be transmitted and transmits,
the LTE multicarrier receiver performs demodulation on the received multicarrier signal.
According to an embodiment of the present invention, the LTE multicarrier transmitter includes a first interworking unit, a multicarrier frame combining unit, a first multicarrier modulation unit, a second multicarrier modulation unit, a digital-to-analog conversion unit, and an LTE transmitting unit, which are sequentially connected.
According to the embodiment of the invention, the first multi-carrier modulation unit comprises a carrier frequency sequence modulator, a first multi-carrier signal carrier frequency code buffer unit, an interpolation unit and a first multi-carrier digital oscillation unit which are connected in sequence.
According to the embodiment of the invention, the second multi-carrier modulation unit comprises a first RS sequence generation unit, a second multi-carrier frequency code buffer unit, an interpolation frequency elimination unit, a second multi-carrier digital oscillation unit and an operational amplification unit;
one output of the first RS sequence generating unit is accessed to a multi-carrier frame combining unit, the other output of the first RS sequence generating unit is accessed to a second multi-carrier digital oscillation unit through a second multi-carrier frequency code buffer unit, orthogonal and in-phase signals output by the first multi-carrier digital oscillation unit are respectively accessed to an interpolation frequency eliminating unit, the interpolated in-phase and orthogonal carrier signals output by the 2 interpolation frequency eliminating units are respectively mixed with two paths of carrier signals generated by the second multi-carrier digital oscillation unit to obtain first in-phase and first orthogonal signals, the first in-phase and first orthogonal signals are accessed to an operational amplifying unit to obtain the difference between the first orthogonal signals and the first in-phase signals, and the difference is sent to an LTE transmitting unit through a digital.
According to the embodiment of the invention, the LTE multi-carrier receiver comprises an LTE receiving unit, an analog-to-digital conversion unit, a second multi-carrier demodulation unit, a first multi-carrier demodulation unit, a multi-carrier frame separation unit and a second interaction unit which are connected in sequence.
According to an embodiment of the present invention, the second multicarrier demodulation unit includes a demodulation digital oscillation unit, an inverse interpolation frequency elimination unit, a high frequency elimination unit, a second multicarrier synchronization unit, and a second RS sequence generation unit.
The output of the FFT unit is accessed to a carrier frequency sequence demodulation unit and a level conversion synchronization unit, and the level conversion synchronization unit is fed back and accessed to the FFT unit; the synchronous information output by the multi-carrier frame separation unit is accessed into a second multi-carrier synchronization unit, the output of the second multi-carrier synchronization unit is connected with a second RS sequence generation unit and then accessed into a demodulation digital oscillation unit, two paths of carrier signals sent by the demodulation digital oscillation unit are mixed with the first orthogonal and first in-phase signals obtained by high-speed data sampling of an analog-to-digital conversion unit, and then the mixed signals are respectively processed by an inverse interpolation frequency elimination unit and a high-frequency elimination unit to obtain orthogonal and in-phase signals which are sent to a first multi-carrier demodulation unit.
The multi-carrier modulation system based on the LTE adopts two-stage multi-carrier modulation and demodulation, thereby greatly enhancing the confidentiality performance while ensuring the spectrum efficiency and the data transmission rate of the LTE system, reducing the hardware cost and the realization difficulty and having beneficial technical effects.
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 refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structure of a multi-carrier modulation system based on LTE according to an 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.
According to an embodiment of the present invention, an LTE-based multi-carrier modulation system is provided, as shown in fig. 1, the system includes: an LTE multicarrier transmitter that performs multicarrier modulation on a multicarrier signal to be transmitted and transmits, and an LTE multicarrier receiver that performs demodulation on a received multicarrier signal, wherein,
the LTE multicarrier transmitter comprising: the system comprises a first interaction unit, a multi-carrier frame combination unit, a first multi-carrier modulation unit, a second multi-carrier modulation unit, a digital-to-analog conversion unit and an LTE (long term evolution) transmitting unit which are sequentially connected; wherein,
the first multi-carrier modulation unit comprises a carrier frequency sequence modulator, a first multi-carrier signal carrier frequency code buffer unit, an interpolation unit and a first multi-carrier digital oscillation unit which are connected in sequence;
the second multi-carrier modulation unit comprises a first RS sequence generation unit, a second multi-carrier frequency code buffer unit, an interpolation frequency elimination unit, a second multi-carrier digital oscillation unit and an operational amplification unit;
one output of the first RS sequence generating unit is accessed to a multi-carrier frame combining unit, the other output of the first RS sequence generating unit is accessed to a second multi-carrier digital oscillation unit through a second multi-carrier frequency code caching unit, orthogonal and in-phase signals output by the first multi-carrier digital oscillation unit are respectively accessed to an interpolation frequency eliminating unit, the interpolated in-phase and orthogonal carrier signals output by the 2 interpolation frequency eliminating units are respectively mixed with two paths of carrier signals generated by the second multi-carrier digital oscillation unit to obtain first in-phase and first orthogonal signals, the first in-phase and first orthogonal signals are accessed to an operational amplifying unit to obtain the difference between the first orthogonal signals and the first in-phase signals, and the difference is sent to an LTE transmitting unit through a digital;
the LTE multicarrier receiver comprises: the LTE system comprises an LTE receiving unit, an analog-to-digital conversion unit, a second multi-carrier demodulation unit, a first multi-carrier demodulation unit, a multi-carrier frame separation unit and a second interaction unit which are connected in sequence; wherein,
the second multi-carrier demodulation unit comprises a demodulation digital oscillation unit, an inverse interpolation frequency elimination unit, a high frequency elimination unit, a second multi-carrier synchronization unit and a second RS sequence generation unit;
the first multi-carrier demodulation unit comprises an FFT unit, a carrier frequency sequence demodulation unit and a level conversion synchronization unit; the carrier frequency sequence demodulation unit comprises a carrier frequency identification unit and a convolution demodulation unit;
the output of the FFT unit is accessed to a carrier frequency sequence demodulation unit and a level conversion synchronization unit, and the level conversion synchronization unit is fed back and accessed to the FFT unit; the synchronous information output by the multi-carrier frame separation unit is accessed into a second multi-carrier synchronization unit, the output of the second multi-carrier synchronization unit is connected with a second RS sequence generation unit and then accessed into a demodulation digital oscillation unit, two paths of carrier signals sent by the demodulation digital oscillation unit are mixed with the first orthogonal and first in-phase signals obtained by high-speed data sampling of an analog-to-digital conversion unit, and then the mixed signals are respectively processed by an inverse interpolation frequency elimination unit and a high-frequency elimination unit to obtain orthogonal and in-phase signals which are sent to a first multi-carrier demodulation unit.
According to an embodiment of the present invention, the performing multi-carrier modulation on a multi-carrier signal to be transmitted by an LTE multi-carrier transmitter specifically includes:
a1, acquiring data information to be sent by an LTE multicarrier transmitter through a first interaction unit;
a2, a multi-carrier frame combination unit simultaneously obtains the synchronous information generated by the first RS sequence generation unit and the data information to be sent of the first interaction unit, and carries out frame combination processing, and the information is sent to the first multi-carrier modulation unit for processing after frame combination;
a3, sending the frame combined data to the carrier frequency sequence modulator of the first multi-carrier modulation unit, carrying out carrier frequency sequence modulation on the frame combined information data by adopting a carrier frequency migration function to obtain first multi-carrier sequence information, accessing the first multi-carrier signal carrier frequency code buffer unit by taking the sequence identification code as an address to obtain the carrier frequency code, and sending the carrier frequency code to the interpolation unit;
a4, carrying out interpolation processing on the first multi-carrier sequence by the interpolation unit, and increasing the sampling speed to match with the sampling speed of the first multi-carrier digital oscillation unit by carrying out interpolation processing on the carrier frequency code;
a5, the interpolated information enters the first multi-carrier digital oscillation unit, which obtains the carrier frequency code of the first multi-carrier signal and outputs the first multi-carrier signal with in-phase and quadrature signals and related to the input data information, the in-phase and quadrature signals are represented by the formula ①, wherein fcIs the frequency of the first multi-carrier signal,
SI(t)＝cos(fct)，SQ(t)＝sin(fct)①
a6, the in-phase and quadrature two paths of first multi-carrier signals enter the interpolation frequency elimination unit of the second multi-carrier unit respectively for interpolation, and the sampling speed is increased to fsMatching the data rate with the data rate of the output signal of the second multi-carrier digital oscillation unit;
a7, the first RS sequence generating unit outputs the predefined sequence, and accesses the second multi-carrier frequency code buffer unit by using the sequence identification code as the address;
a8, the second multi-carrier digital oscillation unit obtains the carrier frequency code of the second multi-carrier frequency band to generate two paths of orthogonal modulation rate RfThe modulated carrier of (a) is mixed with the interpolated in-phase and quadrature first multi-carrier signals, respectively, to obtain first in-phase and first quadrature second multi-carrier signals, represented by formula ②, where f isqIs overloaded for the second timeThe frequency of the selected frequency band of the wave,
SI1(t)＝cos(fqt),SQ1(t)＝sin(fqt)②
a9, the first in-phase and the first quadrature signals enter the operational amplifier unit to get the difference between them, the difference between the first quadrature signal and the first in-phase signal is sent to the LTE transmitter unit through the D/A converter unit and transmitted by the antenna, the transmitted signal is represented by formula ③, fcIs the frequency, f, of the first multi-carrier signalqIs the frequency of the second multi-carrier signal,
S(t)＝SI(t)-SQ(t)＝cos(fct)*cos(fqt)-sin(fct)*sin(fqt)＝cos[(fc+fq)t]③
according to the embodiment of the invention, the demodulation of the received multi-carrier signal by the LTE multi-carrier receiver specifically comprises the following steps:
b1, sending radio frequency signals obtained by an LTE receiving unit of the LTE multi-carrier receiver through a radio frequency antenna and a preposed radio frequency amplifier thereof to an analog-to-digital conversion unit for high-speed data sampling to obtain a first orthogonal and a first same-phase two-path signals;
b2, the second multi-carrier synchronization unit adjusts the state information and the clock information of the local spread spectrum code generation unit according to the synchronization information demodulated by the multi-carrier frame separation unit, and sends the synchronization information to the second RS sequence generation unit, so that the second RS sequence generation unit generates an RS predefined code consistent with the modulation rule of the radio frequency signal sent by the LTE multi-carrier transmitter;
b3, the RS predefined code is accessed to the demodulation digital oscillation unit, the demodulation digital oscillation unit is controlled to generate two paths of modulation carrier signals consistent with the modulation rule of the radio frequency signals sent by the LTE multicarrier transmitter, and the two paths of modulation carrier signals are respectively mixed with the first orthogonal and first in-phase signals obtained in the step B1 to realize second demodulation;
b4, the two paths of demodulated signals are respectively subjected to quadrature digital down-conversion by an inverse interpolation frequency elimination unit, and out-of-band interference signals are eliminated by a high-frequency elimination unit to obtain quadrature and in-phase first multi-carrier signals which are sent to a first multi-carrier demodulation unit;
b5, under the control of the level conversion synchronization unit, the FFT unit determines the initial time of the modulation signal, calculates the amplitude and phase information of each path of multi-carrier signal, and then sends the amplitude and phase information to the carrier frequency identification unit;
b6, the carrier frequency identification unit determines an effective modulation signal according to the amplitude information and the phase information of each path of multi-carrier signal calculated by the FFT unit, converts the effective modulation signal into a carrier frequency sequence number corresponding to a signal sent by the LTE multi-carrier transmitter, and sends the number into the convolution demodulation unit;
b7, the convolution demodulation unit restores the corresponding received data information according to the carrier frequency sequence number, and then sends the information to the multi-carrier frame separation unit;
b8, the multi-carrier frame separation unit completes the frame separation of the demodulation information and feeds back the synchronization information to the modulation synchronization unit, and the useful data information is sent to the end user through the second interaction unit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An LTE-based multi-carrier modulation system, the system comprising: an LTE multicarrier transmitter and an LTE multicarrier receiver,
the LTE multicarrier transmitter performs multicarrier modulation on a multicarrier signal to be transmitted and transmits,
the LTE multicarrier receiver performs demodulation on the received multicarrier signal.
2. A system as claimed in claim 1, the LTE multicarrier transmitter comprising a first interworking unit, a multicarrier frame combining unit, a first multicarrier modulating unit, a second multicarrier modulating unit, a digital-to-analog converting unit and an LTE transmitting unit connected in sequence.
3. A system as claimed in claim 2, the first multicarrier modulation unit comprising, connected in series, a carrier frequency sequence modulator, a first multicarrier signal carrier code buffer unit, an interpolation unit and a first multicarrier digital oscillation unit.
4. The system of claim 3, wherein the second multi-carrier modulation unit comprises a first RS sequence generation unit, a second multi-carrier code buffer unit, an interpolation frequency elimination unit, a second multi-carrier digital oscillation unit and an operational amplification unit;
one output of the first RS sequence generating unit is accessed to a multi-carrier frame combining unit, the other output of the first RS sequence generating unit is accessed to a second multi-carrier digital oscillation unit through a second multi-carrier frequency code buffer unit, orthogonal and in-phase signals output by the first multi-carrier digital oscillation unit are respectively accessed to an interpolation frequency eliminating unit, the interpolated in-phase and orthogonal carrier signals output by the 2 interpolation frequency eliminating units are respectively mixed with two paths of carrier signals generated by the second multi-carrier digital oscillation unit to obtain first in-phase and first orthogonal signals, the first in-phase and first orthogonal signals are accessed to an operational amplifying unit to obtain the difference between the first orthogonal signals and the first in-phase signals, and the difference is sent to an LTE transmitting unit through a digital.
5. The system of claim 4, wherein the LTE multi-carrier receiver comprises an LTE receiving unit, an analog-to-digital converting unit, a second multi-carrier demodulating unit, a first multi-carrier demodulating unit, a multi-carrier frame separating unit and a second interacting unit which are connected in sequence.
6. The system of claim 5, wherein the second multi-carrier demodulation unit comprises a demodulation digital oscillation unit, an inverse interpolation frequency elimination unit, a high frequency elimination unit, a second multi-carrier synchronization unit, and a second RS sequence generation unit.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585396A (en) * | 2003-07-22 | 2005-02-23 | 三星电子株式会社 | Method and apparatus for reducing impulse noise of multicarrier modulated signal |
| CN104506219A (en) * | 2014-12-08 | 2015-04-08 | 朱今兰 | Wireless receiving and transmitting system based on long-term evolution (LTE) |
| CN105407065A (en) * | 2015-11-30 | 2016-03-16 | 杨荣 | Multi-carrier modulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585396A (en) * | 2003-07-22 | 2005-02-23 | 三星电子株式会社 | Method and apparatus for reducing impulse noise of multicarrier modulated signal |
| CN104506219A (en) * | 2014-12-08 | 2015-04-08 | 朱今兰 | Wireless receiving and transmitting system based on long-term evolution (LTE) |
| CN105407065A (en) * | 2015-11-30 | 2016-03-16 | 杨荣 | Multi-carrier modulation system |
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