CN112751798A - NMW-OFDM system for terahertz communication perception integration - Google Patents

NMW-OFDM system for terahertz communication perception integration Download PDF

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CN112751798A
CN112751798A CN202110242397.5A CN202110242397A CN112751798A CN 112751798 A CN112751798 A CN 112751798A CN 202110242397 A CN202110242397 A CN 202110242397A CN 112751798 A CN112751798 A CN 112751798A
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perception
communication
nmw
ofdm system
terahertz
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CN112751798B (en
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韩充
吴永知
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Shanghai Jiaotong University
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/90—Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation
    • 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

Abstract

An NMW-OFDM system for terahertz communication perception integration, comprising: the terahertz communication perception integrated transmitter modulates communication data into communication perception integrated radio frequency signals and transmits the communication perception integrated radio frequency signals, and the multistage perception module respectively estimates K speed candidate values in parallel and serially estimates a final target estimation distance from the received target reflection signals. The method fully utilizes the characteristic of terahertz sensing detection, and the distance estimation precision can be improved by three orders of magnitude without reducing the maximum detectable distance, and the speed estimation precision can be improved by one order of magnitude. And simultaneously, the ultrahigh data rate of 100Gbps can be realized, which is more than 100 times of the data rate available in a millimeter wave system.

Description

NMW-OFDM system for terahertz communication perception integration
Technical Field
The invention relates to a technology in the field of terahertz communication, in particular to a non-uniform multi-broadband orthogonal frequency division multiplexing (NMW-OFDM) system for terahertz communication perception integration (THzjoint communication and sensing).
Background
JCS technology involved in existing car networking and Unmanned Aerial Vehicles (UAVs) generally refers to dual functionality of communication and perception, where indoor communication-aware applications include wireless virtual/augmented reality (VR/AR) enabling ultra-fast data flow and human body gesture recognition. The existing communication perception integration schemes are based on Orthogonal Frequency Division Multiplexing (OFDM) or based on orthogonal time-frequency space modulation (OTFS) multi-carrier waveforms, but the schemes are difficult to meet the current industrial requirements in the aspect of receiver complexity.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the NMW-OFDM system for the terahertz communication sensing integration, which makes full use of the characteristics of terahertz sensing detection.
The invention is realized by the following technical scheme:
the invention relates to a terahertz communication perception integrated NMW-OFDM system, which comprises: a terahertz communication perception integration (NMW-OFDM) transmitter at a transmitting end and a multi-stage perception module at a receiving end, wherein: the terahertz communication perception integrated transmitter modulates communication data into communication perception integrated wireless radio frequency signals and transmits the communication perception integrated wireless radio frequency signals, and the multi-stage perception module respectively estimates K speed candidate values in parallel and serially estimates the received target reflection signals to obtain a final target estimation distance.
Technical effects
The invention integrally solves the problem that the maximum sensing distance of the existing sensing technology based on OFDM is limited by the subcarrier interval, and when the subcarrier interval is increased, the sensing precision can be improved, but the maximum sensing distance can be reduced. According to the invention, a plurality of broadband modulations are utilized, so that the sensing precision is improved, the maximum sensing distance is kept not to be reduced, the maximum non-fuzzy distance of terahertz sensing is improved, and the sub-millimeter distance detection precision is realized.
Compared with the existing OFDM system, the distance estimation precision of the invention can be improved by three orders of magnitude, and the speed estimation precision can be improved by one order of magnitude while the maximum detectable distance is not reduced. And simultaneously, the ultrahigh data rate of 100Gbps can be realized, which is more than 100 times of the data rate available in a millimeter wave system.
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FIG. 1 is a diagram of transmission bands according to the present invention;
FIG. 2 is a schematic diagram of a terahertz communication sensing integrated transmitter according to the present invention;
FIG. 3 is a diagram of a multi-stage perceptual module of the present invention;
fig. 4-7 are schematic diagrams illustrating effects of the embodiment.
Detailed Description
The embodiment relates to an NMW-OFDM system for terahertz communication perception integration, which comprises: a terahertz communication-sensing integrated (NMW-OFDM) transmitter at a transmitting end as shown in fig. 2 and a multi-stage sensing module at a receiving end as shown in fig. 3.
As shown in fig. 2, the terahertz communication sensing integrated transmitter includes: constellation mapper, OFDM multiframe parallel modulator, digital-to-analog converter and frequency shifter, wherein: the constellation diagram mapper maps communication bit rate data into digital code elements of K data frames, an OFDM multi-frame parallel modulator formed by connecting K modulators in parallel maps the K data frames onto various subcarriers of different broadband and modulates the K data frames into digital baseband signals, a digital-to-analog converter converts the digital signals into analog signals, a frequency shifter respectively shifts the different baseband signals to different frequency bands, and superposes a plurality of band-pass signals to output the signals as communication perception integrated radio frequency signals.
The communication sensing integrated wireless radio frequency signal adopts a plurality of broadband modulations, each broadband comprises a plurality of subcarriers, and each broadband modulation uses different subcarrier spacing parameters, as shown in fig. 1, the NMW-OFDM transmission frequency band related to the embodiment includes K transmission frequency bands, K-1 inter-frequency band guard intervals, and 2 out-of-band guard intervals; and a plurality of subcarriers are respectively subjected to OFDM modulation, converted into band-pass signals through frequency shift, and then superposed and output as radio-frequency signals.
The subcarrier spacing parameters include: a minimum spacing and a maximum spacing, wherein: the minimum interval is smaller than the reciprocal of the maximum path delay, and the maximum interval is far smaller than the coherent bandwidth of the channel; preferably, the first frequency band employs the minimum subcarrier spacing, the kth frequency band employs the maximum subcarrier spacing, and the subcarrier spacing of the 2 nd to K-1 th frequency bands is set with a tendency from small to large therebetween.
As shown in fig. 3, the multi-stage sensing module includes: OFDM multiframe parallel demodulator, perception processor array and joint parameter estimation unit, wherein: an OFDM multi-frame parallel demodulator formed by connecting K OFDM demodulators in parallel demodulates received target reflection signals and respectively outputs K data frames, a perception processor array formed by the K perception processors adopts a multi-stage perception algorithm, namely, K speed candidate values are respectively estimated from the K data frames in parallel, simultaneously, target distances are estimated from transmitting frames and receiving frames in the K data frames in series, and a combined parameter estimation unit obtains the final target estimated speed from the K speed candidate values through an optimal lower bound combination algorithm.
The multi-stage perception algorithm is based on the received data frame YiAnd a perception processor giSetting the maximum sensing distance diAnd weight a of the perceptual processori，bi( i 1, 2, …, K), the estimate r of the 1 st perceptual processor is calculated(1)，v(1)So that r is(1)∈[0，d1]And then loops to compute the estimate r 'for the ith perceptual processor'(i)，v(i)So r'(i)∈[0，di]And finally obtain
Figure BDA0002962677930000021
Figure BDA0002962677930000022
Thereby obtaining the estimated distance of the target
Figure BDA0002962677930000023
And
Figure BDA0002962677930000024
said maximum perceived distance
Figure BDA0002962677930000025
Wherein c is0Represents the propagation velocity of electromagnetic waves,. DELTA.fiIndicating the subcarrier spacing for the ith wideband.
The optimal lower bound merging algorithm is obtained by solving the following optimization problems:
Figure BDA0002962677930000031
the solution of the above optimization problem is
Figure BDA0002962677930000032
Wherein: a isiAnd biWeights for the distance and velocity estimates, Var [ r ], respectively, for the ith perceptual processor(i)]，Var[v(i)]Respectively, the estimated variance lower bound values of the target distance and the speed estimated by the ith perception processor are calculated according to
Figure BDA0002962677930000033
Figure BDA0002962677930000034
Wherein the SNRiRepresenting the signal-to-noise ratio, N, of the ith received data frameiIndicates the number of sub-carriers used by the ith data frame, MiNumber of data blocks, T, representing the ith data frameiIndicating the symbol interval used by the ith OFDM modulator, fcRepresenting the carrier frequency.
As shown in fig. 4, comparing Root Mean Square Error (RMSE) of the target distance estimation for the conventional OFDM system, the MW-OFDM system, and the NMW-OFDM system of the present invention, it can be seen that the root mean square error of the present invention is significantly lower than that of the prior art.
As shown in fig. 5, the rms error of the target distance estimation of the NMW-OFDM system of the present invention is compared under different modulation modes for the conventional OFDM system, and as can be seen, the rms error of the present invention on 4-QAM and 16-QAM is significantly lower than that of the prior art.
As shown in fig. 6, the rms error of the NMW-OFDM system of the present invention for the target speed estimation is compared, and as can be seen, the rms error of the present invention is significantly lower than that of the prior art.
As shown in fig. 7, the Achievable rates (Achievable rates) of the conventional OFDM and the NMW-OFDM system of the present invention in the millimeter wave and terahertz frequency bands are compared, and as can be seen from the figure, the Achievable rates of the present invention are improved.
Through specific practical experiments, under the simulation environment setting of MATLAB, parameters such as 0.3THz carrier frequency, maximum subcarrier spacing of 192MHz, maximum sensible distance of 100m, reference target distance of 60m and 32 subcarriers are used for simulation, and the estimation error of the NMW-OFDM system for the target distance can reach 10-4And m, the estimation precision of the target speed can reach the centimeter per second level, and the maximum perception precision is not sacrificed.
Compared with the prior OFDM system which only modulates one broadband, the NMW-OFDM system modulates a plurality of broadband, the prior perception algorithm only utilizes one group of data frames, and the multi-stage perception algorithm utilizes a plurality of data frames to enable a plurality of estimators to jointly estimate the target parameters. Compared with the existing OFDM system, the method can improve the distance estimation precision from centimeter level to submillimeter level, improve the speed estimation precision by one order of magnitude, and improve the achievable data transmission rate by two orders of magnitude compared with the millimeter wave frequency band.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (7)

1. An NMW-OFDM system for terahertz communication perception integration, comprising: the terahertz communication perception integrated transmitter is located at the transmitting end and the multi-stage perception module is located at the receiving end, wherein: the terahertz communication perception integrated transmitter modulates communication data into communication perception integrated wireless radio frequency signals and transmits the communication perception integrated wireless radio frequency signals, and the multi-stage perception module respectively estimates K speed candidate values in parallel and serially estimates the received target reflection signals to obtain a final target estimation distance.
2. The NMW-OFDM system for terahertz communication-sensing integration according to claim 1, wherein the communication-sensing integration radio frequency signal employs a plurality of wideband modulations, each wideband modulation comprising a plurality of subcarriers, each wideband modulation employing a different subcarrier spacing parameter.
3. The NMW-OFDM system for terahertz communication-sensing integration according to claim 2, wherein said subcarrier spacing parameters include: a minimum spacing and a maximum spacing, wherein: the minimum spacing is less than the inverse of the maximum path delay, and the maximum spacing is much less than the coherence bandwidth of the channel.
4. The NMW-OFDM system for terahertz communication-sensing integration according to claim 3, wherein the first frequency band employs a minimum subcarrier spacing, the Kth frequency band employs a maximum subcarrier spacing, and the subcarrier spacing of the 2 nd to K-1 th frequency bands is set from small to large in a trend between the two.
5. The NMW-OFDM system for terahertz communication perception integration according to claim 1, wherein the multi-stage perception module comprises: OFDM multiframe parallel demodulator, perception processor array and joint parameter estimation unit, wherein: an OFDM multi-frame parallel demodulator formed by connecting K OFDM demodulators in parallel demodulates received target reflection signals and respectively outputs K data frames, a perception processor array formed by the K perception processors adopts a multi-stage perception algorithm, namely, K speed candidate values are respectively estimated from the K data frames in parallel, simultaneously, target distances are estimated from transmitting frames and receiving frames in the K data frames in series, and a combined parameter estimation unit obtains the final target estimated speed from the K speed candidate values through an optimal lower bound combination algorithm.
6. The sensor for terahertz communication according to claim 5The integrated NMW-OFDM system is characterized in that the multi-stage perception algorithm is based on the received data frame YiAnd a perception processor giSetting the maximum sensing distance diAnd weight a of the perceptual processori，bi(i 1, 2, …, K), the estimate r of the 1 st perceptual processor is calculated(1)，v(1)So that r is(1)∈[0，d1]And then loops to compute the estimate r 'for the ith perceptual processor'(i)，v(i)So r'(i)∈[0，di]And finally obtain
Figure FDA0002962677920000011
Figure FDA0002962677920000021
Thereby obtaining the estimated distance of the target
Figure FDA0002962677920000022
And
Figure FDA0002962677920000023
7. the NMW-OFDM system for terahertz communication-sensing integration according to claim 5, wherein said optimal lower bound combining algorithm is obtained by solving the following optimization problem:
Figure FDA0002962677920000024
wherein: var [ r ](i)]，Var[v(i)]The estimated variance lower bound values of the target distance and the speed estimated by the ith perception processor are respectively.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113364718A (en) * 2021-05-24 2021-09-07 北京邮电大学 Perception communication integration system based on 5G NR
CN115396263A (en) * 2022-07-29 2022-11-25 北京邮电大学 OTFS communication perception integrated signal target parameter estimation method
WO2023040215A1 (en) * 2021-09-16 2023-03-23 Nokia Shanghai Bell Co., Ltd. Apparatuses, methods, and computer readable media for terahertz channel communication
WO2023184484A1 (en) * 2022-04-01 2023-10-05 Zte Corporation Wireless communication and sensing method and device thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105245584A (en) * 2015-09-25 2016-01-13 北京航空航天大学 Car networking perceptual system based on OFDM and radar-communication integration, and construction method thereof
CN109951196A (en) * 2019-04-23 2019-06-28 四川众为创通科技有限公司 A kind of Terahertz multi-carrier communications systems
US20190363909A1 (en) * 2015-10-12 2019-11-28 Syracuse University Efficient channel estimation and symbol detection for massive mimo-ofdm

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105245584A (en) * 2015-09-25 2016-01-13 北京航空航天大学 Car networking perceptual system based on OFDM and radar-communication integration, and construction method thereof
US20190363909A1 (en) * 2015-10-12 2019-11-28 Syracuse University Efficient channel estimation and symbol detection for massive mimo-ofdm
CN109951196A (en) * 2019-04-23 2019-06-28 四川众为创通科技有限公司 A kind of Terahertz multi-carrier communications systems

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113364718A (en) * 2021-05-24 2021-09-07 北京邮电大学 Perception communication integration system based on 5G NR
CN113364718B (en) * 2021-05-24 2022-02-25 北京邮电大学 Perception communication integration system based on 5G NR
WO2022246998A1 (en) * 2021-05-24 2022-12-01 北京邮电大学 Sensing and communication integrated system based on mobile communication signal
WO2023040215A1 (en) * 2021-09-16 2023-03-23 Nokia Shanghai Bell Co., Ltd. Apparatuses, methods, and computer readable media for terahertz channel communication
WO2023184484A1 (en) * 2022-04-01 2023-10-05 Zte Corporation Wireless communication and sensing method and device thereof
CN115396263A (en) * 2022-07-29 2022-11-25 北京邮电大学 OTFS communication perception integrated signal target parameter estimation method
CN115396263B (en) * 2022-07-29 2023-06-30 北京邮电大学 OTFS communication perception integrated signal target parameter estimation method

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