CN103795665A - Substrate integrated waveguide interconnection-based quadrature phase shift keying (QPSK) high-speed data transmission system - Google Patents
Substrate integrated waveguide interconnection-based quadrature phase shift keying (QPSK) high-speed data transmission system Download PDFInfo
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Abstract
The invention discloses a substrate integrated waveguide interconnection-based quadrature phase shift keying (QPSK) high-speed data transmission system. The substrate integrated waveguide interconnection-based quadrature phase shift keying (QPSK) high-speed data transmission system includes a quadrature phase shift keying (QPSK) modulation module, a substrate integrated waveguide interconnection structure and a quadrature phase shift keying (QPSK) demodulation module, wherein the quadrature phase shift keying (QPSK) modulation module modulates inputted binary signals, the quadrature phase shift keying (QPSK) demodulation module demodulates received signals and outputs the demodulated signals, and the substrate integrated waveguide interconnection structure is adopted as a system interconnection transmission channel and connects the quadrature phase shift keying (QPSK) modulation module and the quadrature phase shift keying (QPSK) demodulation module. According to the substrate integrated waveguide interconnection-based quadrature phase shift keying (QPSK) high-speed data transmission system of the invention, the substrate integrated waveguide interconnection structure and quadrature phase shift keying (QPSK) modulation and demodulation technologies are applied to a microwave-frequency band high-speed interconnection system; after the inputted binary signals are subjected to quadrature phase shift keying (QPSK) modulation, the transmission rate of the binary signals is reduced to 1/2 of the original transmission rate of the binary signals, and the binary signals are transmitted through the substrate integrated waveguide interconnection structure; the received signals are subjected to quadrature phase shift keying (QPSK) demodulation, and the demodulated signals are outputted, and a binary bit sequence can be restored; and therefore, high-speed data transmission can be realized.
Description
Technical field
The present invention relates to the high-speed interconnect technical field of microwave substrate integrated waveguide (SIW), Quadrature Phase Shift Keying (QPSK) modulation /demodulation and microwave frequency band, specifically a kind of QPSK high speed data transmission system based on substrate integration wave-guide interconnection.
Background technology
Along with improving constantly of communication system data transmission rate, the frequency range that uses develop towards high-frequency microwave millimeter wave.In this frequency range, traditional interconnection has unsurmountable shortcoming.First,, although the frequency band of conventional interconnect line has covered frequency spectrum very wide from direct current to high band, can obviously increase in high band loss; Secondly,, along with SOC (system on a chip) is tending towards miniaturization, between many interconnection lines, there is serious coupling crosstalk problem; Again, serious effect of dispersion and radiation effect are also the problems can not be ignored; These factors can cause signal that decay and distortion occur, and affect the integrality of signal, and then have restricted its application in high speed data transfer.Therefore, seek a kind of high-performance, the high speed interconnect structure that easy of integration, volume is little, cost is low is the study hotspot of high speed data transfer always.
Substrate integration wave-guide (SIW) is filled rectangular waveguide by traditional sucrose and is developed, and its basic structure is made up of with the parallel periodicity metal throuth hole of two rows on substrate the medium substrate of double-sided copper-clad.Because the pitch of holes of every row's metal throuth hole is far smaller than wavelength, therefore very little by the energy of gap leakage, be equivalent to inside and filled the rectangular waveguide of medium.Two row's periodicity metal throuth holes have played the effect of electric wall, and the overwhelming majority in the electromagnetic energy of generation is limited in the space between metallic walls and is propagated.Substrate integration wave-guide has not only overcome the shortcoming of conventional interconnect, has that loss is little, crosstalk low, high, the high broadband of Q value and the advantage such as passband is smooth at high band, and it is easy to processing, easy of integration, with low cost, has greatly increased its practicality.Because frequency electromagnetic waves can transmit to low-loss in SIW, therefore can utilize substrate integration wave-guide transmitting high speed digital signal.
Quadrature Phase Shift Keying (QPSK) is a kind of conventional digital signal modulation mode, and it has the higher availability of frequency spectrum, stronger anti-interference and circuit realized comparatively simple.It is to utilize four kinds of outs of phase of carrier wave to carry out representative digit information, and each carrier phase represents two bit informations, and therefore each quaternary code element can represent with two bits.If the previous code element in two binary elements represents with a, a rear code element represents with b, four kinds of combinations of ab, 00,01,10,11, represent respectively 45 ° of four kinds of different carrier phases, 135 °, 225 °, 315 °, bit information is to realize transmission by four kinds of phase places of carrier wave, therefore, in QPSK, each modulation can be transmitted 2 information bits, has improved band efficiency.Good and the availability of frequency spectrum advantages of higher just because of strong interference immunity, the error performance of QPSK modulation system, the fields such as extensive use and digital microwave communication system.
Recently, substrate integration wave-guide has been introduced in the world to high-speed interconnect technology.AsaneeSuntives has proposed a kind of high speed data transmission system (Design and characterization of the EBG waveguide-based interconnects based on substrate integration wave-guide interconnection first in 2007, IEEE Trans.Adv.Packag., design based on electric tape gap waveguide interconnected and performance evaluation, 2007), application for SIW in high-speed interconnect, has designed a kind of high-speed digital transmission system based on substrate integration wave-guide interconnection.This system is carried out simple Up/Down Conversion processing with frequency mixer to baseband signal and is realized the transmission of signal in SIW, owing to adopting simple modulation demodulation system, its band system band utilance is lower, has restricted the message transmission rate of system, and its message transmission rate is only up to 5Gbps.
Above-mentioned conventional interconnect technology exists the shortcomings such as high loss, height are crosstalked, strong dispersion in the application of microwave frequency band, has limited its application in high speed data transfer; The data transmission system based on SIW interconnection of above-mentioned bibliographical information, adopts simple modulation demodulation system, can't meet the more requirement of high data rate.
Summary of the invention
The present invention is directed to the technical problem existing in above-mentioned prior art, a kind of QPSK high speed data transmission system based on substrate integration wave-guide interconnection is provided, by substrate integration wave-guide interconnection structure and QPSK modulation /demodulation module application in the high speed interconnection system of microwave frequency band, adopt substrate integration wave-guide as high speed interconnect structure, and signal is carried out to QPSK modulation /demodulation processing, substrate integration wave-guide interconnection structure has in high band loss low, Q value is high, easy of integration, the feature of low cost and miniaturization, it is high that QPSK modulation /demodulation module has band efficiency, the features such as strong interference immunity, QPSK high speed data transmission system based on substrate integration wave-guide interconnection has the feature of low error rate and high transfer rate.
The present invention is achieved by the following technical solutions:
Based on the QPSK high speed data transmission system of substrate integration wave-guide interconnection, comprise QPSK modulation module, substrate integration wave-guide interconnection structure and QPSK demodulation module, wherein, described QPSK modulation module is modulated the binary signal of input, described QPSK demodulation module carries out demodulation output to received signal, described substrate integration wave-guide interconnection structure, as system interconnection transmission channel, connects QPSK modulation module and QPSK demodulation module.
Preferably, described QPSK modulation module comprises: string converting unit, level conversion unit, first order low-pass filter unit and up-conversion mixing unit and adder unit, wherein, serial input signals is converted to two-way parallel signal by described string converting unit, its two-way output is connected to respectively two-way level conversion unit, so that unipolar binary signal is converted to bipolar signal, be connected to again first order low-pass filter unit, to complete shaping filter, then be connected to up-conversion mixing unit, carry out frequency translation, finally be connected to adder unit, realize the synthetic of two paths of signals, described QPSK modulation module is modulated the binary signal of input, by improving band system band utilance, improves system data transmission rate.
Preferably, described substrate integration wave-guide interconnection structure comprises: input stimulus structure, output coupled structure, crossover sub structure and substrate integrated wave guide structure; Described input stimulus structure is connected with described substrate integrated wave guide structure by described crossover sub structure respectively with output coupled structure.
Preferably, the periodically metal throuth hole of two rows that described substrate integrated wave guide structure comprises medium substrate and is embedded in medium substrate and is parallel to each other along medium substrate both sides of edges; Described medium substrate upper and lower surface coated copper layer.
Preferably, the diameter d of described periodicity metal throuth hole is less than or equal to 1/5 medium wavelength X
g, i.e. d≤0.2 λ
g; Adjacent two pitch of holes S are not more than the metal throuth hole diameter d of twice, i.e. S≤2d.
Preferably, described input stimulus structure and described output coupled structure all adopt 50 ohm of planar microstrip lines.
Preferably, described crossover sub structure comprises: for connecting the input crossover sub of input stimulus structure and substrate integrated wave guide structure and for being connected the output crossover sub of output coupled structure and substrate integrated wave guide structure, described input crossover sub and output crossover sub all adopt trapezoidal transition line structure.
Preferably, described QPSK demodulation module comprises: down-conversion mixing unit, second level low-pass filter unit, bit timing recovery unit, threshold judgement unit and parallel serial conversion unit, wherein, described down-conversion mixing unit is down-converted to base band to the modulation signal receiving, the output of down-conversion mixing unit is first connected to second level low-pass filter unit, with by after the high fdrequency component filtering of signal, be connected to again threshold judgement unit, to realize symbol synchronization, described threshold judgement unit is also connected with bit timing recovery unit, the output of threshold judgement unit is connected with parallel serial conversion unit, described QPSK demodulation module carries out demodulation output to the modulation signal after described substrate integration wave-guide interconnection transmission, reverts to binary bit sequence.
For guaranteeing the accurate demodulation of signal, the carrier wave of described QPSK modulation module is through one section of 50 ohm microstrip, produce after certain phase deviation, obtain the carrier wave for described QPSK demodulation module, and this phase pushing figure equates with the phase pushing figure that binary signal produces after the transmission of substrate integration wave-guide interconnection structure.
Substrate integrated wave guide structure and QPSK modulation-demodulation technique are applied to high-speed interconnect technical field by the present invention, the binary signal of input is through QPSK modulation, transmission rate reduces to original 1/2, modulation signal is through substrate integration wave-guide interconnection transmission, receive signal again through demodulation output, revert to binary bit sequence, thereby realize the transfer of data of two-forty.
The present invention compared with prior art, has the following advantages:
1, planarized structure: substrate integration wave-guide is applied in high speed interconnection system, and input stimulus all adopts planar circuit with output coupling mechanism, easily and other plane circuit integrated;
2, compact conformation, miniaturization: adopt substrate integration wave-guide, than having had larger reduction on traditional Rectangular Waveguide Structure volume and area;
3, low-loss, low crosstalking: adopt substrate integration wave-guide interconnection structure, less than traditional loss that is interconnected in high band, and crosstalking between many interconnection lines is very low.
4, adopt QPSK modulation-demodulation technique, improved the band efficiency of system, transmission rate is 2 times of traditional high frequency carrier modulating system.
Accompanying drawing explanation
Fig. 1 is entire system structured flowchart of the present invention;
Fig. 2 is substrate integration wave-guide interconnection structure schematic diagram of the present invention;
Fig. 3 is substrate integrated wave guide structure schematic diagram of the present invention;
Fig. 4 is substrate integration wave-guide scattering parameter schematic diagram of the present invention;
Fig. 5 is the planisphere of system output signal of the present invention;
In figure: 1 is input stimulus structure, 2 is output coupled structure, and 3 is input crossover sub, and 4 is copper layer, and 5 is output crossover sub, and 6 is periodicity metal throuth hole, and 7 is medium substrate.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under take technical solution of the present invention as prerequisite; detailed execution mode and concrete operating process are provided; it should be noted that; to those skilled in the art; without departing from the inventive concept of the premise; can also make some distortion and improvement, these all belong to protection scope of the present invention.
Fig. 1 is the overall system structure block diagram of the present embodiment.The present embodiment provides a kind of high speed data transmission system of the Quadrature Phase Shift Keying (QPSK) based on substrate integration wave-guide interconnection (SIW), comprise QPSK modulation module, substrate integration wave-guide interconnection structure and QPSK demodulation module, wherein, QPSK modulation module is modulated the binary signal of input, QPSK demodulation module carries out demodulation output to received signal, substrate integration wave-guide interconnection structure, as system interconnection transmission channel, connects QPSK modulation module and QPSK demodulation module.
QPSK modulation module comprises: string converting unit, level conversion unit, first order low-pass filter unit, up-conversion mixing unit and adder unit.QPSK demodulation module comprises: down-conversion mixing unit, second level low-pass filter unit, bit timing recovery unit, threshold judgement unit and parallel serial conversion unit.First, the binary signal a of input
nbehind string converting unit and level translation unit, by speed R
bsequence to be divided into speed be R
b/ 2 a
2nwith a
2n-1two-way bipolarity level signal, obtains I (t) and Q (t) two paths of signals through first order low pass filter; Then respectively with two orthogonal same frequency carrier wave cos (2 π f through up-conversion mixing unit
lOt) with-sin (2 π f
lOt) multiply each other, after being added by adder unit, obtain qpsk modulation signal S (t).Substrate integration wave-guide interconnection structure transmission modulation signal S (t), is output as r (t).Then signal transmission is carried out after down-conversion mixing and second level low-pass filtering, obtaining two-way output signal is Y
iand Y (t)
q(t); The two passes through threshold judgement and parallel serial conversion again, obtains the binary signal Y of final output
n.
Fig. 2 is the substrate integration wave-guide interconnection structure of the present embodiment, comprising: interconnective input stimulus structure 1, output coupled structure 2, crossover sub structure (comprising input crossover sub 3 and output crossover sub 5) and substrate integrated wave guide structure.Substrate integrated wave guide structure comprises: the periodically metal throuth holes 6 of two rows that medium substrate 7 and being embedded in is parallel to each other along both sides of edges in medium substrate 7.Medium substrate 7 upper and lower surface coated copper layers 4; Input stimulus structure 1 is connected with substrate integrated wave guide structure with output crossover sub 5 by input crossover sub 3 respectively with output coupled structure 2.
In the present embodiment, input stimulus structure 1 in substrate integration wave-guide interconnection structure and output coupled structure 2 are made up of the microstrip line of a section 50 ohm respectively, for being connected of substrate integration wave-guide and other circuit, microstrip line, through input crossover sub 3 and the output crossover sub of trapezoidal transition line structure, is connected with substrate integrated wave guide structure.Whole input stimulus structure and output coupled structure are plane, have higher design freedom, easily processing, easy of integration.
Fig. 3 is the substrate integrated wave guide structure schematic diagram of the present embodiment.The plated-through hole 6 of the medium substrate 7 both sides of edges periodic arrangement of substrate integrated wave guide structure, periodicity metal throuth hole, plays the effect of electric wall.Periodically the diameter d of metal throuth hole 6 is less than or equal to 1/5 medium wavelength X
g, i.e. d≤0.2 λ
g; Adjacent two pitch of holes S are not more than the metal throuth hole diameter d of twice, i.e. S≤2d, to reduce radiation loss.
The substrate integration wave-guide interconnection structure that the present embodiment provides, its centre frequency is chosen in 21GHz, and bandwidth is at 14-28GHz.The relative dielectric constant ε of medium substrate
rbe 2.2, losstangenttanδ is 0.0009, and thickness h is 1mm; Input/output terminal micro belt line width W
1for 1mm, length is L
1for 3.7mm; Trapezoidal transition line crossover sub length L
2for 6.4mm, width W
2for 3.776mm; Substrate integrated wave guide structure length L
3for 36mm, the width W between two row's metal throuth holes is 7.016mm, and the diameter d of plated-through hole is 0.4mm, and the interval S of adjacent metal through hole is 0.6mm.
Fig. 4 is the substrate integration wave-guide interconnection structure scattering parameter simulate and test comparison diagram of the present embodiment.Its centre frequency is 21GHz, and bandwidth is 14-28GHz, and in passband, Insertion Loss is about 0.5dB left and right, and return loss is all greater than 15dB.
Fig. 5 is the planisphere of the output signal of the QPSK high speed data transmission system based on substrate integration wave-guide interconnection of the present embodiment.Information source output signal is the PRBS(2 of 12.5Gbps
15-1) PRBS pseudo-random bit sequence, output signal planisphere is very clear, and the error rate is very low, can obtain receiving accurately signal.
The PRBS(2 of the QPSK high speed data transmission system transmission 20Gbps based on substrate integration wave-guide interconnection of the present embodiment
15-1), when sequence, input signal has produced certain time delay after system transmission, is about 1.8ns, and now error rate of system still lower than 1e-12.
The QPSK high speed data transmission system based on substrate integration wave-guide interconnection that the present embodiment provides, is applied to substrate integrated wave guide structure and QPSK modulation-demodulation technique in the high-speed interconnect field of microwave frequency band.Described substrate integration wave-guide interconnection structure has low-loss, high Q value, and low crosstalking, low cost and feature easy of integration, make system have good transmission characteristic; Described QPSK modulation-demodulation technique is that a kind of availability of frequency spectrum is very high, there is the modulation system compared with strong anti-interference, the application of combined base integrated waveguide interconnection makes system under the limited prerequisite of transmission bandwidth, by improving the band efficiency of SIW interconnection, significantly improved message transmission rate, its speed is 2 times of traditional high frequency carrier modulation demodulation system speed.Native system is in the time that substrate integration wave-guide bandwidth is 14GHz, and peak transfer rate can reach 10Gbps, and error rate of system is below 1e-12.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various modifications within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection, it is characterized in that, comprise QPSK modulation module, substrate integration wave-guide interconnection structure and QPSK demodulation module, wherein, described QPSK modulation module is modulated the binary signal of input, described QPSK demodulation module carries out demodulation output to received signal, and described substrate integration wave-guide interconnection structure, as system interconnection transmission channel, connects QPSK modulation module and QPSK demodulation module.
2. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 1, it is characterized in that, described QPSK modulation module comprises: string converting unit, level conversion unit, first order low-pass filter unit, up-conversion mixing unit and adder unit, wherein, serial input signals is converted to two-way parallel signal by described string converting unit, its two-way output is connected to respectively two-way level conversion unit, so that unipolar binary signal is converted to bipolar signal, be connected to again first order low-pass filter unit, to complete shaping filter, then be connected to up-conversion mixing unit, carry out frequency translation, finally be connected to adder unit, realize the synthetic of two paths of signals, described QPSK modulation module is modulated the binary signal of input, by improving the band efficiency of substrate integration wave-guide interconnection, improves system data transmission rate.
3. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 1, it is characterized in that, described substrate integration wave-guide interconnection structure comprises: input stimulus structure, output coupled structure, crossover sub structure and substrate integrated wave guide structure, described input stimulus structure is connected with described substrate integrated wave guide structure by described crossover sub structure respectively with output coupled structure.
4. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 3, it is characterized in that, the periodically metal throuth hole of two rows that described substrate integrated wave guide structure comprises medium substrate and is embedded in medium substrate and is parallel to each other along medium substrate both sides of edges, described medium substrate upper and lower surface coated copper layer.
5. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 4, is characterized in that, the diameter d of described periodicity metal throuth hole is less than or equal to 1/5 medium wavelength X
g, i.e. d≤0.2 λ
g; Adjacent two pitch of holes S are not more than the metal throuth hole diameter d of twice, i.e. S≤2d.
6. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 3, is characterized in that, described input stimulus structure and described output coupled structure all adopt 50 ohm of planar microstrip lines.
7. according to the QPSK high speed data transmission system based on substrate integration wave-guide interconnection described in claim 3 or 6, it is characterized in that, described crossover sub structure comprises: for connecting the input crossover sub of input stimulus structure and substrate integrated wave guide structure and for being connected the output crossover sub of output coupled structure and substrate integrated wave guide structure, described input crossover sub and output crossover sub all adopt trapezoidal transition line structure.
8. the QPSK high speed data transmission system based on substrate integration wave-guide interconnection according to claim 1, it is characterized in that, described QPSK demodulation module comprises: down-conversion mixing unit, second level low-pass filter unit, bit timing recovery unit, threshold judgement unit and parallel serial conversion unit, wherein, described down-conversion mixing unit is down-converted to base band to the modulation signal receiving, the output of down-conversion mixing unit is first connected to second level low-pass filter unit, with by after the high fdrequency component filtering of signal, be connected to again threshold judgement unit, to realize symbol synchronization, described threshold judgement unit is also connected with bit timing recovery unit, the output of threshold judgement unit is connected with parallel serial conversion unit, described QPSK demodulation module carries out demodulation output to the modulation signal after described substrate integration wave-guide interconnection transmission, reverts to binary bit sequence.
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Application publication date: 20140514 |