CN113783821A - Frame signaling transmission method based on power multiplexing - Google Patents
Frame signaling transmission method based on power multiplexing Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
Abstract
The invention belongs to the technical field of wireless data transmission and signal processing, and particularly relates to a frame signaling transmission method based on power multiplexing, which is used for a transmission system using a variable modulation coding/self-adaptive modulation coding system; the method comprises the following steps: forming a physical layer signaling symbol sequence of the transmission frame by a physical layer signaling code PLSC of the transmission frame through specific modulation mapping, repeatedly coding the physical layer signaling symbol sequence of the next transmission frame for multiple times and adding filling symbols to obtain a signaling transmission sequence of the next transmission frame; the signaling transmission sequence of the next transmission frame and the data symbol of the current frame are transmitted in parallel in the same channel by utilizing power distribution and power domain superposition coding; the receiving end obtains the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel, thereby obtaining the parameter information of the coding modulation combination of the next frame in advance, leading the receiving end to carry out corresponding configuration on the data demodulator and the decoder in time and keeping the continuity of receiving, demodulating and decoding.
Description
Technical Field
The invention belongs to the technical field of wireless data transmission and signal processing, and particularly relates to a frame signaling transmission method based on power multiplexing.
Background
In order to adapt to time-varying link conditions, Variable Code Modulation (VCM) and Adaptive Code Modulation (ACM) are generalized, and a transmitting end selects a suitable code modulation combination (codec) for data transmission according to the link conditions, and notifies a receiving end of the codec used for a current transmission frame through a Physical Layer Signaling Code (PLSC).
In a conventional data transmission method, frame signaling is generally encapsulated after a synchronization frame header and before data transmission, and is transmitted serially. The receiving end needs to demodulate and decode the PLSC first to accurately demodulate and decode the transmission data in the current transmission frame. Therefore, the conventional serial frame signaling transmission method has the problems of reducing the data transmission efficiency and affecting the continuity of transmission when a large demodulation processing delay exists.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a frame signaling transmission method based on power multiplexing, which reduces demodulation delay and ensures high continuity of data transmission in a VCM/ACM (voice coil motor/adaptive control module) application scene.
The invention provides a frame signaling transmission method based on power multiplexing, which comprises the following steps:
forming a physical layer signaling symbol sequence of the transmission frame by a physical layer signaling code PLSC of the transmission frame through specific modulation mapping, repeatedly coding the physical layer signaling symbol sequence of the next transmission frame for multiple times and adding filling symbols to obtain a signaling transmission sequence of the next transmission frame; wherein, the physical layer signaling code PLSC carries parameter information of the coding modulation combination adopted by the data symbols in the transmission frame;
the signaling transmission sequence of the next transmission frame and the data symbol of the current frame are transmitted in parallel by utilizing power distribution and power domain superposition coding; the receiving end obtains the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel, thereby obtaining the parameter information of the coding modulation combination of the next frame in advance, leading the receiving end to carry out corresponding configuration on the data demodulator and the decoder in time and keeping the continuity of receiving, demodulating and decoding.
As an improvement of the above technical solution, the signaling transmission symbol of the next transmission frame and the data symbol of the current frame are transmitted in parallel in the same channel by using power allocation and power domain superposition coding; the receiving end receives the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel; the specific process comprises the following steps:
the signaling transmission symbol of the next transmission frame is superposed on the data symbol of the current transmission frame by utilizing power distribution and power domain superposition coding, and the superposed transmission symbol is output in a channel;
the transmitting terminal modulates the superposed transmission symbols on a carrier wave to generate a radio frequency transmission waveform and sends the radio frequency transmission waveform into a channel; after the receiving end finishes receiving, sampling and synchronizing, a receiving symbol is obtained;
the receiving end adopts a continuous interference elimination method to carry out power domain decoding on the received symbol, thereby obtaining the data symbol of the current frame and simultaneously obtaining the physical layer signaling code of the next transmission frame in parallel, and further obtaining the parameter information of the next frame coding modulation combination in advance before the next frame data comes.
As an improvement of the above technical solution, the signaling transmission symbol of the next transmission frame is superimposed on the data symbol of the current transmission frame by using power allocation and power domain superposition coding, and the superimposed transmission symbol is output in one channel; the specific process comprises the following steps:
assuming that the transmission power is P, the first allocated power is beta1P is the data symbol of the current transmission frame and is used for outputting the data symbol of the current frame; second division of power beta2P is the signaling transmission symbol of the next transmission frame and is used for transmitting the signaling transmission symbol; wherein, beta1+β2＝1；β1＜＜β2；
Suppose data symbols d n of the current transmission frame](0<n<N-1) according to the digital modulation constellation mapping mode selected for use, d [ N ]]Can be expressed as complex symbols, i.e. d n]＝an+jbn(ii) a Wherein the real part anBeing in-phase components, i.e. d [ n ]]The component of the corresponding constellation point projected to the I axis; j is the complex imaginary part; bnIs a quadrature component, i.e. d [ n ]]The corresponding constellation point is projected to the Q-axis component.
Performing power domain superposition coding on a signaling transmission symbol y [ M + N + N ] of a next transmission frame and a data symbol d [ N ] of a current transmission frame to generate a superposed transmission symbol s [ N ]:
therefore, the signaling transmission symbol y [ M + N + N ] of the next transmission frame and the data symbol d [ N ] of the current transmission frame are synchronously output in parallel in one channel, namely the transmission symbol s [ N ] after superposition. Wherein, M + N is the frame length of the transmission frame.
As an improvement of the above technical solution, the receiving end employs a successive interference cancellation method to perform power domain demodulation and decoding on the received symbol, so as to obtain a data symbol of a current frame and simultaneously obtain a physical layer signaling code of a next transmission frame in parallel, and obtain parameter information of a next frame coding modulation combination in advance before the next frame data arrives; the specific process comprises the following steps:
after receiving the radio frequency transmission waveform, the receiving end identifies the synchronous frame head through digital-to-analog conversion and sampling, and after completing the synchronization, a receiving symbol is obtained and is marked as r [ N ], wherein 0< N < N-1;
the receiving end adopts a continuous interference elimination method, takes the signaling transmission symbol in the receiving symbol as interference noise with weak power, carries out power domain demodulation decoding on the data symbol of the current frame with strong power, and records the recovered data symbol as the interference noise with weak power
From the received symbols r [ n ]]Middle elimination
Thereby recovering the signaling transmission symbol of the next frame
For recovered signaling symbol
Demodulation and decoding are carried out, so that the physical layer signaling code PLSC of the next transmission frame is obtained in advance, and the parameter information of the code modulation combination of the next frame is obtained in advance.
As an improvement of the above technical solution, the parameter information of the next frame coding modulation combination includes: and the channel coding code rate and the modulation mode adopted by the transmission frame data in the next transmission frame.
As one improvement of the above technical solution, the physical layer signaling symbol sequence of the next transmission frame is repeatedly encoded for multiple times and padding symbols are added to obtain a signaling transmission sequence of the next transmission frame; the specific process comprises the following steps:
assuming that the frame length of the current transmission frame is M + N, wherein N data symbols are transmitted, the length of the physical layer signaling symbol sequence of the next transmission frame is K, and repeating the physical layer signaling symbol sequence of the next transmission frame
Next to, and increased thereafter
After the bit is filled with the symbols, generating a signaling transmission sequence y of the next transmission frame; wherein the length of y is N,
indicating a rounding down.
As an improvement of the above technical solution, the method further includes:
the receiving end judges whether the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame:
if the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame, the receiving end directly processes the next transmission frame without resynchronization;
if the parameter information of the next frame code modulation combination is different from the parameter information of the code modulation combination used in the current transmission frame, because the receiving end obtains the parameter information of the next frame code modulation combination in advance before receiving the next frame, when the next frame is received, the parameter setting of a demodulation decoder of the receiving end can be adjusted in time while performing frame header detection and synchronization on the next transmission frame, and data demodulation and decoding are performed without interruption.
Compared with the prior art, the invention has the beneficial effects that:
1. the method of the invention utilizes the power domain superposition coding to ensure that the signaling transmission symbol of the next transmission frame can be superposed in the data symbol of the current frame, thereby realizing the parallel transmission of the same channel;
2. the receiving end can obtain the physical layer signaling code of the next transmission frame while demodulating the data symbol of the current frame, so that the receiving end can predict the code modulation combination CODMOD of the next transmission frame; at the receiving end, the signaling identification and the data receiving can be processed in parallel, and the transmission delay and interruption caused by receiving and processing the signaling are eliminated.
Drawings
Fig. 1 is a schematic structural diagram of a transmission frame used in a frame signaling transmission method based on power multiplexing according to the present invention;
fig. 2 is a flow chart of receiving end data processing in a frame signaling transmission method based on power multiplexing according to the present invention;
FIG. 3 is a flow chart of a frame signaling transmission method based on power multiplexing according to the present invention;
FIG. 4 is a schematic diagram of power domain superposition coding in the present invention;
FIG. 5 is a flowchart of a method of generating PLSC from CODMOD codes in embodiment 1 of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples.
The invention provides a frame signaling transmission method based on power multiplexing, in particular to a transmission method of physical layer signaling. The physical layer signaling symbol of the next transmission frame and the data symbol of the current frame are allocated with transmission power in proportion, and the physical layer signaling symbol of the next frame and the data symbol of the current frame are transmitted in parallel in the same channel through power domain superposition coding, as shown in fig. 1.
At a receiving end, demodulating and decoding a data symbol of a current frame by using a Successive Interference Cancellation (SIC) method, and regarding a signaling transmission symbol of a next transmission frame as transmission interference; then, the data symbols are removed from the received symbols received by the receiving end to obtain the physical layer signaling symbols, thereby obtaining the physical layer signaling codes PLSC, and the PLSC is decoded to obtain the code modulation combination CODMOD of the next frame, as shown in fig. 2. The method can support real-time variable/self-adaptive coding modulation transmission, so that a receiving end can predict parameter information of a next frame coding modulation combination carried in a next frame signaling code PLSC before receiving next transmission frame data, thereby timely configuring a demodulation decoder of the receiving end, avoiding unnecessary resynchronization, reducing processing time delay and improving transmission continuity.
As shown in fig. 3, the method is used for transmitting a Physical Layer Signaling Code (PLSC) containing coded modulation Combining (CODMOD) information to a receiving end under a Variable Coded Modulation (VCM)/Adaptive Coded Modulation (ACM) transmission scheme, and the method includes:
a physical layer signaling code PLSC of a transmission frame forms a physical layer signaling symbol sequence through specific modulation mapping, and repeatedly encodes and adds filling symbols to the physical layer signaling symbol sequence of the next transmission frame to obtain a signaling transmission sequence of the next transmission frame; wherein, the signaling transmission sequence comprises a plurality of repeated signaling symbol sequences; each signaling symbol sequence carries parameter information of a coding modulation combination adopted by a data symbol in the frame;
specifically, assuming that the frame length of the current transmission frame is M + N, where N data symbols are transmitted, the length of the physical layer signaling symbol sequence of the next transmission frame is K, and the physical layer signaling symbol sequence of the next transmission frame is repeated
Second (complete repetition coding) and then increased
After the bit is filled with the symbols, generating a signaling transmission sequence y of the next transmission frame; wherein the length of y is N,
indicating a rounding down.
The purpose of repeating the coding and the padding symbols is to make the length of the signaling transmission sequence consistent with the number of data symbol bits in a transmission frame so as to realize power domain superposition coding and simultaneously improve the transmission quality of PLSC under the condition of lower signal-to-noise ratio;
since repetition coding is used and the entire transmission frame comprises a plurality of repeated PLSCs, the receiving end can obtain the signaling code PLSC of the next frame with sufficient accuracy without having to complete the reception of the entire transmission frame.
The signaling transmission symbol of the next transmission frame and the data symbol of the current frame are transmitted in parallel in the same channel by utilizing power distribution and power domain superposition coding; the receiving end obtains the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel, thereby obtaining the parameter information of the coding modulation combination of the next frame in advance, leading the receiving end to carry out corresponding configuration on the data demodulator and the decoder in time and keeping the continuity of receiving, demodulating and decoding.
Specifically, a signaling transmission symbol of a next transmission frame is superposed on a data symbol of a current transmission frame by utilizing power distribution and power domain superposition coding, and the superposed transmission symbol is output in a channel;
specifically, assuming that the transmission power is P, the first allocated power β1P is the data symbol of the current transmission frame and is used for outputting the data symbol of the current frame; second division of power beta2P is the signaling transmission symbol of the next transmission frame and is used for transmitting the signaling transmission symbol; wherein, beta1+β2＝1；β1＜＜β2；
Suppose data symbols d n of the current transmission frame](0<n<N-1) according to the digital modulation constellation mapping mode selected for use, d [ N ]]Can be expressed as complex symbols, i.e. d n]＝an+jbn(ii) a Wherein the real part anBeing in-phase components, i.e. d [ n ]]The component of the corresponding constellation point projected to the I axis; j is the complex imaginary part; imaginary part bnIs a quadrature component, i.e. d [ n ]]The corresponding constellation point is projected to the Q-axis component.
In this embodiment, the selectable digital modulation modes include, but are not limited to, QPSK, 8PSK, 16QAM, 32QAM, 16APSK, and 32APSK modulation modes; the receiving end and the transmitting end have the mapping relation between CODMOD and PLSC, and the PLSC is generated by CODMOD codes through a certain specific method.
Performing power domain superposition coding on a signaling transmission symbol y [ M + N + N ] of a next transmission frame and a data symbol d [ N ] of a current transmission frame to generate a superposed transmission symbol s [ N ]:
therefore, the signaling transmission symbol y [ M + N + N ] of the next transmission frame and the data symbol d [ N ] of the current transmission frame are synchronously output in parallel in one channel, namely the transmission symbol s [ N ] after superposition.
The transmitting terminal modulates the superposed transmission symbols on a carrier wave to generate a radio frequency transmission waveform and sends the radio frequency transmission waveform into a channel; after the receiving end finishes receiving, sampling and synchronizing, a receiving symbol is obtained;
the receiving end adopts a continuous interference elimination method to carry out power domain decoding on the received symbol, thereby obtaining the data symbol of the current frame and simultaneously obtaining the physical layer signaling code of the next transmission frame in parallel, and further obtaining the parameter information of the next frame coding modulation combination in advance before the next frame data comes.
Specifically, after receiving a radio frequency transmission waveform, a receiving end identifies a synchronization frame header after digital-to-analog conversion and sampling, and obtains a receiving symbol after completing synchronization, wherein the receiving symbol is denoted as r [ N ], and 0< N < N-1;
the receiving end adopts a continuous interference elimination method, takes the signaling transmission symbol in the receiving symbol as interference noise with weak power, carries out power domain demodulation decoding on the data symbol of the current frame with strong power, and records the recovered data symbol as the interference noise with weak power
From the received symbols r [ n ]]Middle elimination
Thereby recovering the signaling transmission symbol of the next frame
For recovered signaling symbol
Demodulation decoding is performed to obtain in advance the physical layer signalling code PLSC of the next transmission frame and from itAnd acquiring the parameter information of the next frame of code modulation combination.
Because the physical layer signaling code PLSC adopts
Sub-repetition coding, i.e. corresponding sequence of a transmission frame
In which comprises
A physical layer signalling code PLSC. This design may provide an accurate physical layer signalling code PLSC in environments where the signal to noise ratio is low.
Wherein the parameter information of the next frame code modulation combination comprises: and the channel coding code rate and the modulation mode adopted by the transmission frame data in the next transmission frame.
The physical layer signaling code PLSC of the next frame and the data of the current frame are transmitted in parallel, and the parameter information of the coding modulation composition of the next frame can be known in advance, so that the receiving end can adjust the setting in time, and the interruption of transmission is avoided.
The method further comprises the following steps:
the receiving end judges whether the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame:
if the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame, the receiving end directly processes the next transmission frame without resynchronization;
if the parameter information of the next frame code modulation combination is different from the parameter information of the code modulation combination used in the current transmission frame, because the receiving end obtains the parameter information of the next frame code modulation combination in advance before receiving the next frame, when the next frame is received, the parameter setting of a demodulation decoder of the receiving end can be adjusted in time while performing frame header detection and synchronization on the next transmission frame, and data demodulation and decoding are performed without interruption.
Example 1.
In this example, the variable code modulated physical layer signalling codes PLSC are designed based on the ETSI DVB-S2 standard according to the CCSDS "variable code modulation protocol" (131.5-M-1.1). The coding and modulation modes of data in one transmission frame are kept consistent, namely the coding and modulation modes of the data in one transmission frame are the minimum unit of VCM or ACM, and the data in different transmission frames can adopt different coding and modulation modes.
Assuming that a transmission frame adopts a Physical Layer Signal Code (PLSC) generation method defined by DVB-S2 standard, a coding modulation combination CODMOD code of 5-bits generates PLSC of 64-bits in a manner shown in FIG. 5. Wherein, CODMOD represents the channel coding rate and modulation mode in the transmission frame, as shown in table 1. PLSC is mapped in a pi/2 BPSK constellation to a sequence of physical layer signaling symbols consisting of complex symbols (as shown in fig. 4), with a length K-64.
Table 1 correspondence between CODMOD codes and code modulation schemes
In this embodiment, let the number M of synchronization frame headers be 32, and the number N of data symbols for QPSK modulation to be transmitted in one transmission frame be 32400. First, a sequence of signaling symbols is repeated
Secondly, after the padding symbol with 16 bits, the signaling transmission sequence y of the next transmission frame is generated; wherein y has a length of 32400.
The signaling transmission symbol of the next transmission frame is superposed on the data symbol of the current transmission frame by utilizing power distribution and power domain superposition coding, and the superposed transmission symbol is output in a channel;
specifically, it is assumed that the transmission power per symbol is P ═ 1. Get beta10.95, power β is distributed1P is the data symbol of the current transmission frame and is used for outputting the data symbol of the current frame; get beta2Power β is distributed 0.05 ═ by2P is the signaling transmission symbol of the next transmission frame for transmitting the signaling transmission symbol. During system design, optimal power distribution can be designed according to selection of coding and modulation modes.
Assume data symbol d [ N ] (0< N-1) of the current transmission frame, and adopt QPSK modulation scheme, and the modulation mapping constellation is shown in fig. 4.
Performing power domain superposition coding on a signaling transmission symbol y [ M + N + N ] of a next transmission frame and a data symbol d [ N ] of a current transmission frame to generate a superposed transmission symbol s [ N ]:
therefore, the signaling transmission symbol y [ M + N + N ] of the next transmission frame and the data symbol d [ N ] of the current transmission frame are synchronously output in parallel in one channel, namely the transmission symbol s [ N ] after superposition. The mapping constellation for the transmission symbol sequence s [ N ] (0< N-1) is shown in fig. 4.
The transmitting terminal modulates the superposed transmission symbols on a carrier wave to generate a radio frequency transmission waveform and sends the radio frequency transmission waveform into a channel; after the receiving end finishes receiving, sampling and synchronizing, a receiving symbol is obtained;
the receiving end adopts a Successive Interference Cancellation (SIC) method to decode the power domain of the received symbol, thereby obtaining the data symbol of the current frame, simultaneously obtaining the physical layer signaling code of the next transmission frame in parallel, and obtaining the parameter information of the next frame coding modulation combination in advance before the next frame data arrives.
Specifically, after receiving a radio frequency transmission waveform, a receiving end identifies a synchronization frame header after digital-to-analog conversion and sampling, and obtains a receiving symbol after completing synchronization, wherein the receiving symbol is denoted as r [ N ], and 0< N < N-1;
the receiving end adopts continuous interference elimination method, takes the signaling transmission symbol in the receiving symbol as the interference noise of weak power, and the current frame of strong powerThe data symbols are power domain demodulated and decoded, and the recovered data symbols are recorded as
From the received symbols r [ n ]]Middle elimination
Thereby recovering the signaling transmission symbol of the next frame
When in transmission, a proper code modulation combination CODMOD needs to be selected to ensure the transmission quality of data;
for recovered signaling symbol
And demodulating and decoding to obtain a physical layer signaling code PLSC of the next transmission frame in advance, and obtaining parameter information of the code modulation combination of the next frame in advance from the physical layer signaling code PLSC, and obtaining the code modulation combination CODMOD of the next frame from the parameter information.
The physical layer signaling symbol sequence is repeated and coded for 506 times, namely the sequence corresponding to one transmission frame
Which contains 506 physical layer signalling codes PLSC. This design may provide an accurate physical layer signalling code PLSC in environments where the signal to noise ratio is low.
The receiving end can process the demodulation decoding of the data symbols with strong power and the recovery of PLSC in parallel, and can obtain PLSC with sufficient accuracy without completing the reception of the whole transmission frame. Thus, the modulation and coding scheme used for the next frame is known in advance.
If the CODMOD of the next transmission frame is consistent with the CODMOD in the current parameter frame, the receiving end can directly process the next transmission frame without resynchronization;
if the parameter information of the next frame code modulation combination is different from the parameter information of the code modulation combination used in the current transmission frame, because the receiving end obtains the parameter information of the next frame code modulation combination in advance before receiving the next frame, when the next frame is received, the parameter setting of a demodulation decoder of the receiving end is adjusted in time while performing frame header detection and synchronization on the next transmission frame, data demodulation and decoding are performed without interruption, and smooth data receiving is maintained.
The method is a frame signaling transmission method based on power multiplexing, and is used for transmitting PLSC signaling codes containing CODMOD information to a receiving end under a VCM/ACM transmission system. And realizing that the PLSC of the next transmission frame and the data symbols of the current frame are transmitted simultaneously in the same channel by using power allocation and power domain superposition coding. And parallel processing of a receiving end is supported, and CODMOD information of the next transmission frame can be obtained while the data symbol of the current frame is demodulated and decoded. And according to whether the CODMOD of two adjacent frames changes, correspondingly adjusting the setting of a demodulation decoder at the receiving end. The method avoids unnecessary resynchronization under the condition that the CODMODs of two adjacent frames are not changed, and can complete the configuration of a modulator and an encoder in time under the condition that the CODMODs of the two adjacent frames are changed, reduce the processing delay and improve the continuity of transmission.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A frame signaling transmission method based on power multiplexing, the method comprising:
forming a physical layer signaling symbol sequence by a physical layer signaling code of a transmission frame through specific modulation mapping, repeatedly coding the physical layer signaling symbol sequence of the next transmission frame for multiple times and adding filling symbols to obtain a signaling transmission sequence of the next transmission frame; wherein, the physical layer signaling code carries parameter information of coding modulation combination adopted by data symbols in the transmission frame;
the signaling transmission sequence of the next transmission frame and the data symbol of the current frame are transmitted in parallel in a channel by utilizing power distribution and power domain superposition coding; the receiving end obtains the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel, thereby obtaining the parameter information of the coding modulation combination of the next frame in advance and enabling the receiving end to carry out corresponding configuration on the data demodulator and the decoder in time.
2. The frame signaling transmission method based on power multiplexing as claimed in claim 1, wherein the signaling transmission symbols of the next transmission frame and the data symbols of the current frame are transmitted in parallel in one channel by using power allocation and power domain superposition coding; the receiving end receives the data symbol of the current frame and simultaneously obtains the physical layer signaling code of the next transmission frame in parallel, thereby obtaining the parameter information of the coding modulation combination of the next frame in advance; the specific process comprises the following steps:
the signaling transmission symbol of the next transmission frame is superposed on the data symbol of the current transmission frame by utilizing power distribution and power domain superposition coding, and the superposed transmission symbol is output in a channel;
the transmitting terminal modulates the superposed transmission symbols on a carrier wave to generate a radio frequency transmission waveform and sends the radio frequency transmission waveform into a channel; after the receiving end finishes receiving, sampling and synchronizing, a receiving symbol is obtained;
the receiving end adopts a continuous interference elimination method to carry out power domain decoding on the received symbol, thereby obtaining the data symbol of the current frame and simultaneously obtaining the physical layer signaling code of the next transmission frame in parallel, and further obtaining the parameter information of the next frame coding modulation combination in advance before the next frame data comes.
3. The frame signaling transmission method based on power multiplexing as claimed in claim 2, wherein the signaling transmission symbols of the next transmission frame are superimposed on the data symbols of the current transmission frame by using power allocation and power domain superposition coding, and the superimposed transmission symbols are output in one channel; the specific process comprises the following steps:
assuming that the transmission power is P, the first allocated power is beta1P is the data symbol of the current transmission frame and is used for outputting the data symbol of the current frame; second division of power beta2P is the signaling transmission symbol of the next transmission frame and is used for transmitting the signaling transmission symbol; wherein, beta1+β2＝1；β1＜＜β2；
Suppose data symbols d n of the current transmission frame]，0<n<N-1; according to the selected digital modulation constellation mapping mode, d [ n ]]Expressed as complex symbols, i.e. d [ n ]]＝an+jbn(ii) a Wherein the real part anBeing in-phase components, i.e. d [ n ]]The component of the corresponding constellation point projected to the I axis; j is the complex imaginary part; imaginary part bnIs a quadrature component, i.e. d [ n ]]Component of projection of corresponding constellation point to Q axis
Performing power domain superposition coding on a signaling transmission symbol y [ M + N + N ] of a next transmission frame and a data symbol d [ N ] of a current transmission frame to generate a superposed transmission symbol s [ N ]:
therefore, a signaling transmission symbol y [ M + N + N ] of the next transmission frame and a data symbol d [ N ] of the current transmission frame are synchronously output in parallel in one channel, namely the transmission symbol s [ N ] after superposition; wherein, M + N is the frame length of the transmission frame.
4. The frame signaling transmission method based on power multiplexing as claimed in claim 2, wherein the receiving end employs successive interference cancellation method to perform power domain demodulation decoding on the received symbols, so as to obtain the data symbols of the current frame and simultaneously obtain the physical layer signaling code of the next transmission frame in parallel, and before the next frame data comes, obtain the parameter information of the next frame code modulation combination in advance; the specific process comprises the following steps:
after receiving the radio frequency transmission waveform, the receiving end identifies the synchronous frame head through digital-to-analog conversion and sampling, and after completing the synchronization, a receiving symbol is obtained and is marked as r [ N ], wherein 0< N < N-1;
the receiving end adopts a continuous interference elimination method, takes the signaling transmission symbol in the receiving symbol as interference noise with weak power, carries out power domain demodulation decoding on the data symbol of the current frame with strong power, and records the recovered data symbol as the interference noise with weak power
From the received symbols r [ n ]]Middle elimination
Thereby recovering the signaling transmission symbol of the next frame
For recovered signaling symbol
Demodulation and decoding are carried out, so that the physical layer signaling code PLSC of the next transmission frame is obtained in advance, and the parameter information of the code modulation combination of the next frame is obtained in advance.
5. The frame signaling transmission method based on power multiplexing according to claim 1, wherein the parameter information of the next frame code modulation combination comprises: and the channel coding code rate and the modulation mode adopted by the transmission frame data in the next transmission frame.
6. The frame signaling transmission method based on power multiplexing of claim 1, wherein the physical layer signaling symbol sequence of the next transmission frame is repeatedly encoded multiple times and padding symbols are added to obtain the signaling transmission sequence of the next transmission frame; the specific process comprises the following steps:
assuming that the frame length of the current transmission frame is M + N, wherein N data symbols are transmitted, the length of the physical layer signaling symbol sequence of the next transmission frame is K, and repeating the physical layer signaling symbol sequence of the next transmission frame
Next to, and increased thereafter
After the bit is filled with the symbols, generating a signaling transmission sequence y of the next transmission frame; wherein the length of y is N,
indicating a rounding down.
7. The method for power multiplexing based frame signaling transmission according to claim 1, wherein the method further comprises:
the receiving end judges whether the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame:
if the parameter information of the next frame code modulation combination is consistent with the parameter information of the code modulation combination used by the current transmission frame, the receiving end directly processes the next transmission frame without resynchronization;
if the parameter information of the next frame code modulation combination is different from the parameter information of the code modulation combination used in the current transmission frame, because the receiving end obtains the parameter information of the next frame code modulation combination in advance before receiving the next frame, when the next frame is received, the parameter setting of a demodulation decoder of the receiving end is adjusted in time while performing frame header detection and synchronization on the next transmission frame, and data demodulation and decoding are performed without interruption.
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