A signal energy co-transmission reliable signal transmission method based on dead zone damage compensation
Patent Information
- Application Number
- CN202610958656.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-30
- Publication Date
- 2026-10-13
AI Technical Summary
[0005]然而，对于信能同传系统而言，死区误差对通信的影响并不只表现为输出电压失真，而会在接收端同步解调和匹配滤波之后转化为复基带平面中的星座点偏移、相位偏移、相关峰下降和判决边界压缩
[0025]（1）本发明将死区效应由功率侧平均电压误差转换为接收端复基带符号空间中的死区损伤矢量，能够直接描述死区效应对星座点偏移、判决裕度和相位偏移的影响，更适合信能同传系统的可靠解调需求。
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Abstract
Description
Technical Field
[0001] This invention relates to the fields of power electronic equipment control, power line communication technology, and digital demodulation technology, and in particular to a reliable signal transmission method based on dead-zone impairment compensation for simultaneous signal and power transmission. Background Technology
[0002] With the large-scale integration of distributed photovoltaic, energy storage, electric vehicle charging facilities, and various controllable loads into the power distribution network, power electronic converters are not only undertaking energy conversion and power regulation functions, but are also gradually becoming information interaction nodes in the source-grid-load-storage coordinated control process. The information-energy simultaneous transmission technology, by superimposing a high-frequency communication carrier into the power modulation, enables power electronic converters and power lines to simultaneously undertake energy transmission and information transmission functions, offering advantages such as requiring no additional communication devices and being suitable for the coordinated operation of distributed equipment.
[0003] In a typical simultaneous signal and power transmission system, the transmitting end modulates the data to be transmitted into a high-frequency communication carrier using BPSK or other phase-shift keying methods, then superimposes it with a power frequency reference value to generate a composite modulated signal that drives the power converter; the receiving end recovers the data through filtering, sampling, synchronization, and symbol decision. Since the amplitude of the communication carrier is usually much smaller than the amplitude of the power fundamental wave, its demodulation reliability is easily affected by the non-ideal characteristics of power electronic devices.
[0004] Dead time is a necessary measure to prevent shoot-through between upper and lower bridge arms in inverter arm control. While dead time ensures the safety of power devices, it introduces equivalent voltage errors related to current polarity during bridge arm commutation. Traditional dead time compensation methods mainly focus on fundamental frequency output voltage error, harmonic distortion, and current waveform quality, typically aiming to reduce total harmonic distortion or improve power control accuracy.
[0005] However, for simultaneous signal-to-energy transmission systems, the impact of dead-time error on communication is not limited to output voltage distortion. After synchronous demodulation and matched filtering at the receiver, it transforms into constellation point offset, phase shift, correlation peak descent, and decision boundary compression in the complex baseband plane. Especially near the zero-crossing of the AC current, the current polarity switching can cause abrupt changes in the polarity of the dead-time error. This abrupt change, after being filtered by the receiver bandpass filter, may induce transient oscillations, leading to phase tearing and burst errors in multiple adjacent symbols. Therefore, addressing the dead-time effect solely from the perspective of power-side voltage compensation is insufficient to directly improve the symbol decision reliability of the simultaneous signal-to-energy transmission link. Existing dead-time compensation methods mainly focus on power waveform quality but lack symbol-level communication reliability optimization, especially addressing the following technical issues: First, the dead-time effect manifests as a complex baseband constellation point offset at the communication receiver, which is difficult to eliminate directly by traditional average voltage error compensation; Second, the polarity reversal of the dead-time error near the current zero crossing can cause phase tearing and burst errors, and conventional hard decision can easily convert transient disturbances into continuous bit errors; Third, the carrier amplitude in simultaneous signal and energy transmission communication is relatively small, and the superposition of dead-time disturbances and noise will significantly reduce the decision margin, requiring a reliable demodulation mechanism that simultaneously considers quasi-steady-state offset and zero-crossing transient disturbances. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a reliable signal transmission method for simultaneous signal and energy transmission based on dead zone damage compensation, so as to improve the reliable demodulation capability of the simultaneous signal and energy transmission system under non-ideal power electronic conditions.
[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0008] A reliable signal transmission method for simultaneous signal and power transmission based on dead-zone impairment compensation, proposed according to the present invention, is applied to a simultaneous signal and power transmission system that superimposes an information carrier onto a power modulation quantity via a power electronic converter, comprising:
[0009] Step S1: Based on the known pilot symbols at the transmitting end, obtain the equivalent channel response function from the communication carrier injection point at the transmitting end to the symbol decision point at the receiving end. ,in The angular frequency of the communication carrier.
[0010] Step S2: The transmitting end uses a single-phase H-bridge power electronic converter to perform signal-power co-transmission modulation, modulating the digital information to be transmitted into a high-frequency communication carrier, and superimposing the high-frequency communication carrier onto the power frequency modulation of the single-phase H-bridge to form a composite modulation signal; bipolar SPWM is used to modulate the composite modulation signal, so that the single-phase H-bridge power electronic converter outputs a composite electrical signal including power frequency power components and high-frequency communication carrier components, and transmits the composite electrical signal to the power line;
[0011] Step S3: The receiving end samples the composite electrical signal on the output side of the single-phase H-bridge power electronic converter or the power line connected to the output side, and obtains the received complex vector corresponding to the kth symbol through bandpass filtering, carrier synchronization and symbol timing processing.
[0012] Step S4: Based on the dead time T of the single-phase H-bridge power electronic converter d Switching period T s DC bus voltage U dc In addition to the polarity of the bridge arm current, a dead zone error source model is established;
[0013] Step S5: Project the dead zone error represented by the dead zone error source model into the communication carrier frequency band in a narrowband, and combine it with the equivalent channel response function obtained in step S1 to obtain the dead zone damage vector corresponding to the kth symbol.
[0014] Step S6: Detect the zero-crossing moment of the current based on the sign change of the bridge arm current or the AC side inductor current, and set a zero-crossing protection window before and after the zero-crossing moment of the current; when the kth symbol is within the zero-crossing protection window, it is determined that the current symbol is in the current zero-crossing interval; when the kth symbol is outside the zero-crossing protection window, it is determined that the current symbol is not in the current zero-crossing interval.
[0015] Step S7: Compensate the received complex vector corresponding to the current symbol based on whether the current symbol is in the current zero-crossing interval; when the current symbol is not in the current zero-crossing interval, estimate the quasi-steady-state phase shift based on the dead-zone damage vector obtained in step S5, and perform complex plane compensation based on the quasi-steady-state phase shift to obtain the received complex vector after compensation for the non-current zero-crossing interval; when the current symbol is in the current zero-crossing interval, estimate the quasi-steady-state phase shift based on the dead-zone damage vector obtained in step S5, and perform transient compensation based on the zero-crossing transient dead-zone damage vector caused by the polarity reversal of the dead-zone error to obtain the received complex vector after compensation for the current zero-crossing interval.
[0016] Step S8: Calculate the phase tear angle and decision margin of the current symbol based on the received complex vector after compensation for non-current zero-crossing interval or the received complex vector after compensation for current zero-crossing interval, and obtain the recovered communication data based on the phase tear angle and decision margin.
[0017] As a further optimization of the reliable signal transmission method based on dead zone damage compensation described in this invention, the single-phase H-bridge power electronic converter adopts bipolar SPWM modulation, and the high-frequency communication carrier and the power frequency modulation amount are superimposed in the same modulation channel, so that the power electronic converter can realize information transmission while completing power conversion.
[0018] As a further optimization of the reliable signal transmission method based on dead zone damage compensation described in this invention, the digital information to be transmitted is modulated into a high-frequency communication carrier using phase shift keying. Different binary symbols correspond to different carrier phases. The receiving end obtains the received complex vector corresponding to each symbol through carrier synchronization and symbol timing.
[0019] As a further optimization scheme of the reliable signal transmission method based on dead zone damage compensation described in this invention, the equivalent channel response function is used to characterize the amplitude attenuation, phase shift and receiver filtering link effects experienced by the communication carrier from the communication carrier injection point at the transmitting end to the symbol decision point at the receiving end. The equivalent channel response function is obtained by pilot symbol estimation.
[0020] As a further optimization scheme of the reliable signal transmission method based on dead zone damage compensation described in this invention, the dead zone damage vector is a vector obtained by mapping the dead zone error characterized by the dead zone error source model through the communication carrier frequency band projection and the equivalent channel response function. It is used to characterize the constellation point offset, phase offset and decision margin changes caused by the dead zone effect in the complex baseband plane of the receiver.
[0021] As a further optimization of the reliable signal transmission method based on dead zone damage compensation described in this invention, for symbols in the current zero-crossing interval, the receiving end determines the zero-crossing transient dead zone damage vector based on the sudden change in dead zone error caused by the current polarity reversal, and combines it with the quasi-steady-state phase offset to perform transient compensation on the receiving complex vector corresponding to the current zero-crossing interval, thereby obtaining the receiving complex vector after current zero-crossing interval compensation.
[0022] As a further optimization of the reliable signal transmission method based on dead-zone impairment compensation described in this invention, step S9 includes: outputting a hard decision result based on the projection of the received complex vector after non-current zero-crossing interval compensation or the received complex vector after current zero-crossing interval compensation onto a preset BPSK real axis decision axis; outputting a soft decision result or erasure mark based on the phase offset of the received complex vector after non-current zero-crossing interval compensation or the received complex vector after current zero-crossing interval compensation relative to the BPSK real axis decision axis and a preset phase threshold; the soft decision result or erasure mark is used to reduce continuous bit errors caused by zero-crossing transient disturbances or strong dead-zone disturbances.
[0023] As a further optimization scheme of the reliable signal transmission method based on dead zone damage compensation described in this invention, in S5, the dead zone damage vector is used to characterize the disturbance caused by the dead zone effect in the complex baseband plane at the receiving end.
[0024] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:
[0025] (1) The present invention converts the dead zone effect from the average voltage error on the power side into the dead zone damage vector in the complex baseband symbol space of the receiver, which can directly describe the impact of the dead zone effect on constellation point offset, decision margin and phase offset, and is more suitable for the reliable demodulation requirements of the signal-power simultaneous transmission system.
[0026] (2) The present invention divides the dead zone effect into quasi-steady-state damage and current zero-crossing transient damage, and adopts slow-variable vector estimation compensation and zero-crossing protection decision strategies respectively, which can reduce the error vector amplitude in the non-zero-crossing interval and suppress the sudden bit error in the zero-crossing interval.
[0027] (3) The present invention introduces a phase tear angle and decision margin evaluation mechanism before symbol decision, so that the receiver no longer makes a single hard decision for all symbols, but can output hard decision, soft decision or erase mark according to symbol risk, thereby improving the recovery capability of subsequent error correction decoding. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of a single-phase H-bridge;
[0029] Figure 2 This is a schematic diagram of PSDM technology;
[0030] Figure 3 This is a diagram illustrating the dead zone effect;
[0031] Figure 4 This is a schematic diagram of the dead zone damage compensation and reliable decision-making process described in this invention;
[0032] Figure 5 This is a comparison diagram of the constellation point distribution of the receiver before and after compensation using the present invention;
[0033] Figure 6 This is a comparison chart of the received bit error rate before and after compensation using the present invention. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] like Figure 4 As shown, the present invention is implemented according to the process of equivalent channel response acquisition, composite electrical signal transmission and reception, dead zone error modeling, dead zone damage vector construction, current zero-crossing interval judgment, non-zero-crossing interval compensation, zero-crossing interval transient compensation, and reliable decision and data recovery. Figure 5 The diagram shows a comparison of the receiver constellation point distribution before and after compensation using the present invention, which can be used to demonstrate the suppressive effect of dead zone damage compensation on receiver decision point offset.
[0036] This invention proposes a dead-zone effect modeling and compensation method starting from the symbol space of the receiver. It links the dead time, DC bus voltage, current polarity, receiver link frequency response and symbol decision process. Before symbol decision, it identifies and compensates for complex vector damage caused by the dead zone. At the same time, it performs soft decision or erasure processing on high-risk symbols near the current zero crossing, thereby improving the reliable demodulation capability of the signal-energy simultaneous transmission system under non-ideal power electronic conditions.
[0037] Step 1: Obtain the equivalent channel response function.
[0038] During the pilot symbol phase of the communication frame, the receiver acquires the equivalent channel response function from the converter output to the receiver demodulation input. This function characterizes the amplitude attenuation and phase shift of the communication carrier in the converter output filter, power line, and receiver filtering link. Its expression is:
[0039]
[0040] in, For communication carrier angular frequency, The amplitude-frequency response at the communication carrier frequency point. Let e be the phase response at the communication carrier frequency, where e is the natural base and j is the imaginary unit.
[0041] Step 2: As Figure 1 and 2 As shown, the single-phase H-bridge power electronic converter at the transmitting end performs signal-power simultaneous modulation using power data dual-carrier modulation (PSDM) technology. This involves modulating the digital information to be transmitted into a high-frequency communication carrier and superimposing the high-frequency communication carrier onto the power frequency modulation of the single-phase H-bridge to form a composite modulation signal. After bipolar SPWM modulation, the signal is transmitted from the output side of the single-phase H-bridge to the power line.
[0042] Step 3: The receiving end samples and obtains the receiving decision point.
[0043] The receiver samples the composite electrical signal from the power line or converter output side. This composite signal includes a power frequency component, a communication carrier component, a distortion component caused by dead-zone effects, and a noise component. The receiver first extracts the signal components near the communication carrier frequency using a bandpass filter, then performs carrier synchronization and symbol timing processing to obtain the reception decision point corresponding to the k-th symbol. .
[0044] Step 4: Establish the dead zone equivalent error model
[0045] like Figure 3 As shown, the receiving end uses the dead time of the power electronic converter. Switching cycle DC bus voltage and bridge arm current or AC side inductor current Based on the polarity, a dead-zone equivalent error model is established. The dead-zone equivalent average error voltage... Represented as:
[0046]
[0047] Dead zone error voltage controlled by current polarity Represented as:
[0048]
[0049] Where sgn[] is the sign function. It can be seen that the direction of the dead zone error is related to the polarity of the bridge arm current or the AC side current. When the current polarity changes, the dead zone error also undergoes a polarity reversal.
[0050] Step 5: Calculate the equivalent disturbance of the dead zone error within the communication frequency band and construct the dead zone damage vector.
[0051] In AC systems, dead zone error can be approximated by the power frequency angular frequency. The periodic perturbation is based on the communication carrier angular frequency. The receiver adjusts the frequency according to the communication carrier angular frequency. The corresponding odd harmonic order m, the dead zone error is passed through the equivalent channel response function Projected onto the communication carrier frequency band, the equivalent disturbance amplitude caused by the dead zone error within the communication frequency band is obtained. :
[0052]
[0053] During the kth symbol period, the dead zone error can be equivalent to a narrowband disturbance signal within the communication carrier frequency band:
[0054]
[0055] The dead zone error within the k-th symbol period is the equivalent disturbance amplitude generated by the dead zone error in the communication carrier frequency band; t is time. The equivalent phase of the equivalent disturbance relative to the local reference carrier.
[0056] Mapping it to the complex baseband plane at the receiver yields the dead zone damage vector. :
[0057]
[0058] in, The value represents the amplitude of the disturbance within the dead band during the k-th symbol period. This is the equivalent phase of the disturbance relative to the local reference carrier;
[0059] Step 6: Establish the received complex vector relationship, calculate the quasi-steady-state phase offset, and determine whether the current symbol is in the current zero-crossing interval;
[0060] For BPSK modulation, the ideal communication symbol is represented as:
[0061]
[0062] in, For the k-th ideal communication symbol, For the ideal communication symbol amplitude, Let k be the polarity of the k-th symbol. Considering the dead-zone impairment vector and receiver noise, the receiver decision point is expressed as:
[0063]
[0064] in, This is the receiving decision point corresponding to the k-th symbol, i.e., the receiving complex vector corresponding to the k-th symbol; This is the receiver complex baseband noise vector corresponding to the kth symbol.
[0065] Further expressed as:
[0066]
[0067] Therefore, it can be seen that the dead zone damage vector will cause the receiver decision point to deviate from the ideal BPSK decision axis. Based on the receiver decision point vector relationship, the phase shift caused by the dead zone... Represented as:
[0068]
[0069] exist Under weak perturbation conditions, the phase shift can be approximated as:
[0070]
[0071] The receiving end depends on the bridge arm current or the AC side inductor current. The sign change of the current is used to detect the moment when the current crosses zero. A zero-crossing protection window is set. If the k-th symbol is outside the zero-crossing protection window, it is determined that the current symbol is not in the current zero-crossing range; if the k-th symbol is inside the zero-crossing protection window, it is determined that the current symbol is in the current zero-crossing range. The zero-crossing protection window is used to cover the time range of current polarity reversal and the duration of transient response of the receiver filter.
[0072] Step 7: Perform compensation based on the interval where the current symbol is located.
[0073] When the current symbol is not in the current zero-crossing interval, the dead-time disturbance can be considered as a quasi-steady-state phase shift for a short period of time. The receiver then calculates the phase shift based on the phase shift obtained in step S5. For the receiving judgment point Perform reverse phase rotation compensation to obtain the decision point after compensation in the non-zero-crossing interval. :
[0074]
[0075] This process can rotate the sign point, which has deviated from the ideal decision axis due to the dead zone effect, back to the vicinity of the real axis, thereby reducing the phase error caused by the dead zone effect.
[0076] When the current symbol is in the current zero-crossing interval, the polarity reversal of the bridge arm current or AC side current will cause a sudden change in the polarity of the dead zone error, and its jump variable is expressed as:
[0077]
[0078] in, The jump variable is the dead zone error before and after the current crosses zero; The moment when the current crosses zero The subsequent dead zone error voltage; The moment when the current crosses zero Previous dead zone error voltage; The dead zone equivalent average error voltage is obtained in step 4.
[0079] This transition can be equivalent to a step excitation acting on the front end of the receiver:
[0080]
[0081] in, This is a zero-crossing step disturbance caused by the polarity reversal of the dead zone error; For the time when the current crosses zero Let be the unit step function at the initial time.
[0082] After the step excitation passes through the bandpass filter at the receiver, a zero-crossing transient dead zone damage vector is formed in the complex baseband plane. :
[0083]
[0084] in, The instantaneous amplitude of the zero-crossing transient disturbance. This represents the instantaneous phase of the zero-crossing transient disturbance relative to the local reference carrier. The zero-crossing transient phase tear angle is also mentioned. Represented as:
[0085]
[0086] The receiver adjusts the phase shift based on the quasi-steady state. The zero-crossing transient phase tearing angle corresponding to the kth symbol Construct the total phase compensation amount:
[0087]
[0088] and the receiving judgment point Perform a reverse phase rotation to obtain the decision point after zero-crossing interval compensation:
[0089]
[0090] Step 8: Reliable judgment and data recovery.
[0091] For non-current zero-crossing regions, the compensated decision point is taken as follows: For the current zero-crossing interval, the compensated decision point is taken as... To facilitate consistent judgments, the post-compensation judgment point will be uniformly denoted as... .
[0092] The receiver first performs BPSK hard decision based on the projection of the compensated decision point onto the real axis:
[0093]
[0094] in, This represents the hard decision bit corresponding to the k-th symbol.
[0095] Meanwhile, to avoid continuous hard decision errors caused by zero-crossing transients or strong dead-zone disturbances, the receiver performs reliability grading based on the phase offset of the compensated decision point:
[0096]
[0097] in, The first phase threshold, This is the second phase threshold, and , This is the reliability decision output for the k-th symbol. The receiving end inputs the hard decision result, soft decision result, or erase mark into the data recovery module or error correction decoding module to ultimately recover the original communication data.
[0098] Implementation Case:
[0099] To verify the reliable demodulation method for simultaneous signal and power transmission based on dead-zone impairment compensation proposed in this invention, a simulation model of a single-phase H-bridge simultaneous signal and power transmission system is established on the MATLAB platform in this embodiment. The transmitting end uses BPSK to modulate binary data into a high-frequency communication carrier and superimposes it onto the power frequency modulation of the single-phase H-bridge. The receiving end, after equivalent sampling, bandpass filtering, carrier synchronization, and symbol timing processing, obtains the receiving decision point corresponding to each symbol.
[0100] The simulation parameters were set as follows: switching frequency 20 kHz, dead time 2 μs, power frequency 50 Hz, communication carrier frequency 2 kHz, and symbol period 1 ms. The simulation considered the amplitude attenuation and phase shift of the communication carrier in the line and the receiver filtering link, and constructed a dead time damage vector based on the polarity of the bridge arm current or AC side current. At the same time, transient dead time damage was introduced near the current zero crossing.
[0101] Simulations compare two operating conditions: uncompensated and those compensated using the present invention. For example... Figure 5 As shown, without compensation, the receiving constellation points exhibit a significant offset relative to the BPSK real axis decision direction. After compensation using the method of this invention, the receiving constellation points re-converge near the BPSK real axis, indicating that both quasi-steady-state dead-zone impairment and zero-crossing transient dead-zone impairment are effectively suppressed. Simulation results show that after dead-zone impairment compensation, the receiving constellation points re-approach the ideal BPSK decision axis, the phase offset in non-zero-crossing intervals is significantly reduced, and burst misjudgments in zero-crossing intervals are suppressed. Under the same signal-to-noise ratio conditions, the bit error rate after compensation is lower than that under uncompensated conditions, demonstrating that this invention can effectively reduce the impact of dead-zone effects on the reliability of simultaneous signal-to-energy transmission and demodulation. Figure 6 As can be seen, under the same signal-to-noise ratio (SNR), the overall bit error rate (BER) after applying the dead-zone impairment compensation method of this invention is lower than that of the uncompensated condition. For example, when the SNR is 8 dB, the BER of the receiver in the uncompensated condition is approximately 4.8 × 10⁻³, on the order of 10⁻³; after applying the dead-zone impairment compensation method of this invention, the BER is reduced to approximately 1.6 × 10⁻³, indicating a significant decrease in BER after compensation. This result demonstrates that this invention can effectively reduce constellation point offset and zero-crossing transient misjudgment caused by the dead-zone effect, thereby improving the reliable demodulation capability of the signal-to-energy simultaneous transmission system.
[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A reliable signal transmission method based on dead-zone impairment compensation, characterized in that, Information and power transmission systems that use power electronic converters to superimpose information carriers onto power modulation quantities include: Step S1: Based on the known pilot symbols at the transmitting end, obtain the equivalent channel response function from the communication carrier injection point at the transmitting end to the symbol decision point at the receiving end. ,in The angular frequency of the communication carrier; Step S2: The transmitting end uses a single-phase H-bridge power electronic converter to perform signal-power co-transmission modulation, modulating the digital information to be transmitted into a high-frequency communication carrier, and superimposing the high-frequency communication carrier onto the power frequency modulation of the single-phase H-bridge to form a composite modulation signal; bipolar SPWM is used to modulate the composite modulation signal, so that the single-phase H-bridge power electronic converter outputs a composite electrical signal including power frequency power components and high-frequency communication carrier components, and transmits the composite electrical signal to the power line; Step S3: The receiving end samples the composite electrical signal on the output side of the single-phase H-bridge power electronic converter or the power line connected to the output side, and obtains the received complex vector corresponding to the kth symbol through bandpass filtering, carrier synchronization and symbol timing processing. Step S4: Based on the dead time T of the single-phase H-bridge power electronic converter d Switching period T s DC bus voltage U dc In addition to the polarity of the bridge arm current, a dead zone error source model is established; Step S5: Project the dead zone error represented by the dead zone error source model into the communication carrier frequency band in a narrowband, and combine it with the equivalent channel response function obtained in step S1 to obtain the dead zone damage vector corresponding to the kth symbol. Step S6: Detect the zero-crossing moment of the current based on the sign change of the bridge arm current or the AC side inductor current, and set a zero-crossing protection window before and after the zero-crossing moment of the current; when the kth symbol is within the zero-crossing protection window, it is determined that the current symbol is in the current zero-crossing interval; when the kth symbol is outside the zero-crossing protection window, it is determined that the current symbol is not in the current zero-crossing interval. Step S7: Compensate the received complex vector corresponding to the current symbol based on whether the current symbol is in the current zero-crossing interval; when the current symbol is not in the current zero-crossing interval, estimate the quasi-steady-state phase shift based on the dead-zone damage vector obtained in step S5, and perform complex plane compensation based on the quasi-steady-state phase shift to obtain the received complex vector after compensation for the non-current zero-crossing interval; when the current symbol is in the current zero-crossing interval, estimate the quasi-steady-state phase shift based on the dead-zone damage vector obtained in step S5, and perform transient compensation based on the zero-crossing transient dead-zone damage vector caused by the polarity reversal of the dead-zone error to obtain the received complex vector after compensation for the current zero-crossing interval. Step S8: Calculate the phase tear angle and decision margin of the current symbol based on the received complex vector after compensation for non-current zero-crossing interval or the received complex vector after compensation for current zero-crossing interval, and obtain the recovered communication data based on the phase tear angle and decision margin.
2. The reliable signal transmission method for simultaneous signal transmission based on dead zone impairment compensation according to claim 1, characterized in that, The single-phase H-bridge power electronic converter adopts bipolar SPWM modulation, and the high-frequency communication carrier and the power frequency modulation are superimposed in the same modulation channel, so that the power electronic converter can realize information transmission while completing power conversion.
3. The reliable signal transmission method for simultaneous signal and energy transmission based on dead zone impairment compensation according to claim 1, characterized in that, The digital information to be transmitted is modulated into a high-frequency communication carrier using phase shift keying. Different binary symbols correspond to different carrier phases. The receiving end obtains the received complex vector corresponding to each symbol through carrier synchronization and symbol timing.
4. The reliable signal transmission method for simultaneous signal and energy transmission based on dead zone impairment compensation according to claim 1, characterized in that, The equivalent channel response function is used to characterize the amplitude attenuation, phase shift, and receiver filtering link effects experienced by the communication carrier from the communication carrier injection point at the transmitter to the symbol decision point at the receiver. The equivalent channel response function is obtained through pilot symbol estimation.
5. The reliable signal transmission method based on dead-zone impairment compensation according to claim 1, characterized in that, The dead zone damage vector is a vector obtained by mapping the dead zone error, characterized by the dead zone error source model, through the communication carrier frequency band projection and the equivalent channel response function. It is used to characterize the constellation point offset, phase offset, and decision margin changes caused by the dead zone effect in the complex baseband plane at the receiver.
6. The reliable signal transmission method for simultaneous signal and energy transmission based on dead zone impairment compensation according to claim 1, characterized in that, For symbols in the current zero-crossing interval, the receiver determines the zero-crossing transient dead zone damage vector based on the sudden change in dead zone error caused by the current polarity reversal, and combines it with the quasi-steady-state phase offset to perform transient compensation on the receiving complex vector corresponding to the current zero-crossing interval, thus obtaining the receiving complex vector after current zero-crossing interval compensation.
7. The reliable signal transmission method for simultaneous signal and energy transmission based on dead zone impairment compensation according to claim 1, characterized in that, Step S9 includes: outputting a hard decision result based on the projection of the received complex vector after non-current zero-crossing interval compensation or the received complex vector after current zero-crossing interval compensation onto a preset BPSK real axis decision axis; outputting a soft decision result or erasure mark based on the phase offset of the received complex vector after non-current zero-crossing interval compensation or the received complex vector after current zero-crossing interval compensation relative to the BPSK real axis decision axis and a preset phase threshold; the soft decision result or erasure mark is used to reduce continuous bit errors caused by zero-crossing transient disturbances or strong dead-zone disturbances.
8. The reliable signal transmission method for simultaneous signal transmission based on dead-zone impairment compensation according to claim 1, characterized in that, In S5, the dead zone damage vector is used to characterize the disturbance caused by the dead zone effect in the complex baseband plane at the receiver.