CN116170269B

CN116170269B - SLM optimization method and system for reducing PAPR of OFDM system

Info

Publication number: CN116170269B
Application number: CN202310449834.XA
Authority: CN
Inventors: 喻明强
Original assignee: Sichuan Yangchen Xintong Technology Co ltd
Current assignee: Sichuan Yangchen Xintong Technology Co ltd
Priority date: 2023-04-25
Filing date: 2023-04-25
Publication date: 2023-07-14
Anticipated expiration: 2043-04-25
Also published as: CN116170269A

Abstract

The invention requests protection of an SLM optimization method and a system for reducing PAPR of an OFDM system, which belong to the technical field of communication, and a conventional SLM algorithm unit is adopted to receive a first channel code from a first demodulation and modulation signal sequence; if it is determined that the conventional SLM algorithm does not record information allowing symbol demodulation of the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm; the first PAPR value is a PAPR value which allows the code element to be demodulated in the first decision area is selected from PAPR values recorded in the improved SLM algorithm unit, and the second signal sequence is a signal sequence configured in the first PAPR value. The scheme can preferentially and effectively select low-level PAPR values in an OFDM system in an improved SLM and conventional SLM methods.

Description

SLM optimization method and system for reducing PAPR of OFDM system

Technical Field

The invention belongs to the technical field of communication, and relates to an SLM optimization method and system for reducing PAPR of an OFDM system.

Background

The OFDM system is a very attractive technology for mobile communication systems, and has high spectrum utilization, strong anti-fading capability, and high-speed data transmission in frequency selective fading channels. OFDM system technology has been applied in many practical systems, such as Digital Audio Broadcasting (DAB) and Digital Video Broadcasting (DVB). However, one of the most important problems in the OFDM system is that the PAPR value of the OFDM system signal is large, which easily causes intermodulation distortion of the OFDM system signal and degradation of system performance.

Currently, there are many methods for reducing the PAPR of an OFDM system signal. The simplest method is clipping filtering. He limits the signal PAPR value to a set threshold range and then transmits it, which causes in-band distortion and out-of-band emissions of the signal. Both SLM and Partial Transmit Sequence (PTS) methods can improve the statistical characteristics of OFDM system signals to effectively reduce the PAPR of OFDM system signals, but they require transmitting side information, which may cause a decrease in the transmission rate of the system. There is a literature proposed method for reducing PAPR based on a standard array of linear block codes, but such codewords do not have error correction capability. Channel coding techniques are often used in communication systems in order to improve the error performance of the system. The method combines the coding and the SLM algorithm to provide an improved SLM algorithm, which can effectively reduce the PAPR of an OFDM system, the transmission of side information can not cause the loss of the data rate of the system, and the error rate of the system can be reduced under Rayleigh fading channels.

Disclosure of Invention

The invention aims to avoid the defects of the prior art, and provides an SLM optimization method and system for reducing the PAPR of an OFDM system by analyzing the root cause of the PAPR problem of the OFDM system, starting from the large signal in the compressed time domain and the small signal in the expanded time domain and combining the advantages of amplitude limiting and companding.

According to a first aspect of the present invention, the present invention claims an SLM optimization method for reducing PAPR of an OFDM system, comprising:

an OFDM system receives a first channel code from a first demodulation and modulation signal sequence by adopting a conventional SLM algorithm unit, wherein the first channel code comprises phase information of code elements;

if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm; the first PAPR value is a PAPR value which meets a preset condition and allows the code element to be demodulated in the first judgment area is selected from PAPR values recorded in the improved SLM algorithm unit, the first judgment area is a judgment area represented by the phase information, and the second signal sequence is a signal sequence configured in the first PAPR value;

the information of the PAPR value comprises indication information of the PAPR value, identification of a signal sequence configured in the PAPR value and identification of a judgment area of the PAPR value carrier, the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in the conventional SLM algorithm unit, the information of the PAPR value supported by the signal sequence of K judgment areas is recorded in the improved SLM algorithm unit, the K judgment areas comprise the first judgment area, and K is a positive integer larger than 1.

Further, the first channel coding further includes a signed PAPR selection auxiliary information phase rotation angle of the symbol; if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and identification of the second signal sequence from the modified SLM algorithm, comprising:

determining that the conventional SLM algorithm unit does not record information allowing the symbol to demodulate the PAPR value of the first decision region based on the phase rotation of the symbol, the conventional SLM algorithm unit receiving indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm unit;

the first channel code further includes a symbol identification of the symbol; if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and identification of the second signal sequence from the modified SLM algorithm, including:

if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region based on the phase rotation of the symbol characterized by the symbol identity, the conventional SLM algorithm receives indication information of the first PAPR value and an identity of the second signal sequence from the modified SLM algorithm, the phase rotation of the symbol being requested by the conventional SLM algorithm to be acquired from a receiver based on the symbol identity;

Further, before the OFDM system receives the first channel code from the first demodulated and modulated signal sequence using a conventional SLM algorithm, the method further comprises:

the conventional SLM algorithm unit sends a second channel code to the improved SLM algorithm unit, the second channel code including an identification of a first signal sequence, information of a PAPR value supported by the first signal sequence, the second channel code being used to request the improved SLM algorithm unit to record the PAPR value supported by the first signal sequence into the PAPR value recorded by the improved SLM algorithm unit;

after the conventional SLM algorithm unit sends the second channel code to the modified SLM algorithm unit, the method further comprises:

the conventional SLM algorithm unit sends a third channel code to the modified SLM algorithm unit, the third channel code comprising information of an identification of the first signal sequence and a second PAPR value, the third channel code being used to request the modified SLM algorithm unit to record the second PAPR value into the PAPR value supported by the first signal sequence;

further, after the conventional SLM algorithm unit transmits the second channel code to the modified SLM algorithm unit, the method further comprises:

The conventional SLM algorithm unit transmits a fourth channel code to the modified SLM algorithm unit, the fourth channel code including an identification of the first signal sequence, indication information of a third PAPR value, information of a fourth PAPR value, the fourth channel code being used to request the modified SLM algorithm unit to replace the third PAPR value supported by the first signal sequence with the fourth PAPR value;

the conventional SLM algorithm unit transmits a fifth channel code to the modified SLM algorithm unit, the fifth channel code comprising an identification of the first signal sequence, an indication of a fifth PAPR value, the fifth channel code for requesting the modified SLM algorithm unit to remove the fifth PAPR value from the PAPR values supported by the first signal sequence.

the conventional SLM algorithm unit transmitting a sixth channel code to the modified SLM algorithm unit, the sixth channel code comprising an identification of the first signal sequence, the sixth channel code for requesting the modified SLM algorithm unit to remove PAPR values supported by the first signal sequence from the PAPR values recorded by the modified SLM algorithm unit;

The indication information of the PAPR value comprises a phase rotation angle of the PAPR value;

the improved SLM algorithm unit is also recorded with information of PAPR values supported by a global signal sequence, the global signal sequence provides demodulation and mobile management carriers for global code elements, the PAPR values ordered by the global code elements are allowed to demodulate M judgment areas in the K judgment areas, and M is a positive integer which is more than 1 and less than or equal to K;

the symbol is a global symbol.

According to a second aspect of the present invention, the present invention claims an SLM optimization system for reducing PAPR of an OFDM system, comprising:

a first receiving unit for receiving a first channel code from a first demodulated and modulated signal sequence, the first channel code comprising phase information of symbols;

a first receiving unit, configured to receive, if it is determined that the SLM optimization system for reducing PAPR of the OFDM system does not record information for allowing the symbol to demodulate the PAPR value of the first decision region, indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm unit;

the first PAPR value is a PAPR value which meets a preset condition and allows the code element to be demodulated in the first judgment area is selected from PAPR values recorded in the improved SLM algorithm unit, the first judgment area is a judgment area represented by the phase information, and the second signal sequence is a signal sequence configured in the first PAPR value;

The information of the PAPR value comprises indication information of the PAPR value, identification of a signal sequence configured in the PAPR value and identification of a judgment area of the PAPR value carrier, the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in an SLM optimization system for reducing the PAPR of the OFDM system, the information of the PAPR value supported by the signal sequence of K judgment areas is recorded in an improved SLM algorithm unit, the K judgment areas comprise the first judgment area, and K is a positive integer larger than 1.

Further, the first channel coding further includes a signed PAPR selection auxiliary information phase rotation angle of the symbol;

the first receiving unit is specifically configured to: if it is determined that the SLM optimization system that reduces PAPR of the OFDM system does not record information that allows the symbols to demodulate the PAPR values of the first decision region based on the phase rotation of the symbols, receiving indication information of the first PAPR values and identification of the second signal sequence from the modified SLM algorithm unit;

the first channel code further includes a symbol identification of the symbol;

the first receiving unit is specifically configured to: and if the SLM optimizing system for reducing the PAPR of the OFDM system is determined not to record the information of the PAPR value allowing the symbol to demodulate the first decision area according to the phase rotation of the symbol, receiving the indication information of the first PAPR value from the improved SLM algorithm unit and the identification of the second signal sequence, wherein the phase rotation of the symbol is acquired by the SLM optimizing system for reducing the PAPR of the OFDM system according to the symbol identification.

Further, before the first receiving unit receives the first channel code from the first demodulation and modulation signal sequence, the SLM optimization system for reducing PAPR of the OFDM system further comprises:

a first transmitting unit, configured to transmit, to the modified SLM algorithm unit, a second channel code, where the second channel code includes an identification of a first signal sequence and information of a PAPR value supported by the first signal sequence, and the second channel code is configured to request the modified SLM algorithm unit to record the PAPR value supported by the first signal sequence into the PAPR value recorded by the modified SLM algorithm unit;

after the first transmitting unit transmits the second channel code to the modified SLM algorithm unit, the first transmitting unit is further configured to:

and transmitting a third channel code to the improved SLM algorithm unit, wherein the third channel code comprises the identification of the first signal sequence and the information of a second PAPR value, and the third channel code is used for requesting the improved SLM algorithm unit to record the second PAPR value into the PAPR value supported by the first signal sequence.

Further, after the first transmitting unit transmits the second channel code to the modified SLM algorithm unit, the first transmitting unit is further configured to:

Transmitting a fourth channel code to the improved SLM algorithm, the fourth channel code including an identification of the first signal sequence, indication information of a third PAPR value, information of a fourth PAPR value, the fourth channel code being used to request the improved SLM algorithm to replace the third PAPR value supported by the first signal sequence with the fourth PAPR value;

transmitting a fifth channel code to the modified SLM algorithm, the fifth channel code comprising an identification of the first signal sequence, an indication of a fifth PAPR value, the fifth channel code for requesting the modified SLM algorithm to remove the fifth PAPR value from the PAPR values supported by the first signal sequence.

transmitting a sixth channel code to the modified SLM algorithm unit, the sixth channel code comprising an identification of the first signal sequence, the sixth channel code for requesting the modified SLM algorithm unit to remove PAPR values supported by the first signal sequence from the PAPR values recorded by the modified SLM algorithm unit;

the symbol is a global symbol.

The invention requests protection of an SLM optimization method and a system for reducing PAPR of an OFDM system, wherein a conventional SLM algorithm unit is adopted to receive a first channel code from a first demodulation and modulation signal sequence; if it is determined that the conventional SLM algorithm does not record information allowing symbol demodulation of the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm; the first PAPR value is a PAPR value which is obtained by selecting an allowable symbol meeting a preset condition from PAPR values recorded in the improved SLM algorithm unit and is demodulated in a first judgment area, wherein the first judgment area is a judgment area represented by phase information, and the second signal sequence is a signal sequence configured in the first PAPR value. The scheme can preferentially and effectively select low-level PAPR values in an OFDM system in an improved SLM and conventional SLM methods.

Drawings

FIG. 1 is a workflow diagram of an SLM optimization method for reducing PAPR of an OFDM system according to the present invention;

FIG. 2 is a second workflow diagram of an SLM optimization method for reducing PAPR of an OFDM system according to the present invention;

FIG. 3 is a third workflow diagram of an SLM optimization method for reducing PAPR of an OFDM system according to the present invention;

FIG. 4 is a fourth operational flow diagram of an SLM optimization method for reducing PAPR of an OFDM system according to the present invention;

FIG. 5 is a fifth workflow diagram of an SLM optimization method for reducing PAPR of an OFDM system according to the present invention;

fig. 6 is a block diagram of the structure of an SLM optimization system for reducing PAPR of an OFDM system according to the present invention.

Detailed Description

The following description will be given in detail of the technical solutions in the embodiments of the present application with reference to the accompanying drawings. Wherein, in the description of the embodiments of the present application, "/" means or is meant unless otherwise indicated, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "plural" means two or more than two.

The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, in the embodiment of the present application, a communication interface is added between a first OFDM system standard and a second OFDM system standard, through which the first OFDM system standard of K decision regions may synchronize information of PAPR values supported by local signal sequences of each decision region to the second OFDM system standard, and the first OFDM system standard i may request to query information of PAPR values supported by any signal sequence in the communication system 100 recorded on the second OFDM system standard.

The first and second OFDM system standards have different carrier spacing values.

The embodiment of the application provides an SLM optimization method for reducing the PAPR of an OFDM system, which can reduce the risk of overload of the load of the OFDM system, reduce access delay and improve symbol experience.

The coding and decoding implementation process is as follows, coding part: and establishing a mapping relation between the information m and the code word c according to the coding requirement and the criterion, and then creating a generating matrix by using an error control coding theory. Error correction decoding is implemented in two parts: the first part, in the design stage, determines the correctable error pattern e corresponding to each possible value of the syndrome S and stores the pattern as a syndrome error comparison lookup table. The second part, the decoder is run:

(1) And calculating the syndrome S after the receiving end receives the codeword r.

(2) And (3) finding the correctable error pattern according to the S to determine an error pattern.

(3) And performing modulo-2 addition operation on the error pattern and the received vector to remove errors, and solving a transmission codeword c.

(4) And recovering the information code word m according to the mapping relation table of the information and the code word.

Fig. 1 is a flowchart of an SLM optimization method for reducing PAPR of an OFDM system in accordance with the present invention. As shown in fig. 1, the SLM optimization method for reducing PAPR of the OFDM system provided in the embodiment of the present application includes, but is not limited to, steps S101 to S104. Possible implementations of this embodiment of the method are described further below.

S101, the first signal sequence sends a first channel code to a conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the first channel code sent by the first signal sequence, wherein the first channel code comprises phase information of code elements.

It should be noted that the phase information may be used to characterize one of K decision regions in the communication system 100, such as TA information of a symbol.

S102, the conventional SLM algorithm unit determines whether information allowing the symbols to demodulate the PAPR value of the first decision area is recorded in the conventional SLM algorithm unit; the first judgment area is the judgment area represented by the phase information, and the information of PAPR values supported by the signal sequence in the first judgment area is recorded in a conventional SLM algorithm unit.

In this embodiment, the first channel code further includes at least one parameter of phase rotation of the symbol and symbol identification. The conventional SLM algorithm unit determines whether information allowing the symbol to demodulate the PAPR value of the first decision region is recorded in the conventional SLM algorithm unit according to the phase rotation of the symbol and/or the symbol identification.

In some embodiments of the present application, the first channel code may further include a requested phase rotation angle of the symbol.

Optionally, the first channel coding may also include phase rotation of the symbols. The conventional SLM algorithm unit determining whether information allowing the symbol to demodulate the PAPR value of the first decision region is recorded in the conventional SLM algorithm unit includes: the conventional SLM algorithm unit determines whether information allowing the symbol to demodulate the PAPR value of the first decision region is recorded in the conventional SLM algorithm unit according to the phase rotation of the symbol.

Optionally, the first channel coding further comprises symbol identification. The conventional SLM algorithm unit determining whether information allowing the symbol to demodulate the PAPR value of the first decision region is recorded in the conventional SLM algorithm unit includes: the conventional SLM algorithm unit determines whether information allowing the symbol identified by the symbol to demodulate the PAPR value of the first decision area is recorded in the conventional SLM algorithm unit according to the phase rotation of the symbol identified by the symbol. Wherein the phase rotation of the symbol is requested to be acquired by a conventional SLM algorithm unit from the receiver according to the symbol identification.

Specifically, the conventional SLM algorithm unit first determines whether the conventional SLM algorithm unit records a PAPR value corresponding to the phase rotation of the symbol, and if so, determines whether the PAPR value corresponding to the phase rotation of the symbol allows demodulation of the first decision region.

It may be appreciated that the information of the PAPR value recorded by the conventional SLM algorithm unit includes the identifier of the decision region of the PAPR value carrier, and the conventional SLM algorithm unit may determine whether the PAPR value allows demodulation of the first decision region according to the identifier of the decision region of the PAPR value carrier. If the identity of the decision region of the PAPR value carrier is the identity of the first decision region, the PAPR value allows demodulation of the first decision region.

In the embodiment of the present application, the phase rotation of the symbol, i.e., the phase rotation angle of the PAPR value of the symbol order, includes one or more phase rotation angles. The requested phase rotation angle indicates a phase rotation angle of a PAPR that the high power amplifier wants to register, and one or more phase rotation angles are included in the requested phase rotation angle.

Alternatively, the symbol identifier may be an international mobile symbol identification code.

In the embodiment of the application, the conventional SLM algorithm unit directly acquires the phase rotation of the code element through the first channel coding. Alternatively, the conventional SLM algorithm may obtain the phase rotation of the symbol from the receiver based on the symbol identification in the first channel coding, the phase rotation of the symbol including one or more phase rotation angles. The conventional SLM algorithm unit determines whether the PAPR value of the first decision region corresponding to the phase rotation of the symbol is recorded in the conventional SLM algorithm unit.

It is understood that the conventional SLM algorithm unit has recorded therein information of PAPR values supported by one or more signal sequences corresponding to the conventional SLM algorithm unit.

S103, if no record exists, the conventional SLM algorithm unit sends a seventh channel code to the improved SLM algorithm unit, the improved SLM algorithm unit receives the seventh channel code sent by the conventional SLM algorithm unit, the seventh channel code comprises the phase information of the code element, and the seventh channel code is used for requesting the improved SLM algorithm unit to select a PAPR value for the code element; the improved SLM algorithm unit records information of PAPR values supported by signal sequences of K decision regions, including the first decision region, K being a positive integer greater than 1.

In this embodiment, the seventh channel code further includes at least one parameter of a phase rotation of the symbol and a symbol identification. The seventh channel coding may be used to request the improved SLM algorithm to select PAPR values that allow demodulation of the symbols in the first decision region based on phase rotation of the symbols and/or symbol identification.

Optionally, the seventh channel code further includes a requested phase rotation angle of the symbol; the seventh channel coding is configured to request the modified SLM algorithm to select a PAPR value that allows demodulation of the symbol in the first decision region based on the requested phase rotation angle of the symbol, the phase rotation of the symbol, and/or the symbol identification.

Optionally, the seventh channel coding further comprises phase rotation of the symbols; the seventh channel coding is used to request the improved SLM algorithm to select PAPR values that allow demodulation of the symbols in the first decision region based on the phase rotation of the symbols.

Optionally, the seventh channel coding further comprises symbol identification; the seventh channel coding is configured to request the modified SLM algorithm unit to select a PAPR value allowing demodulation of the symbol in the first decision region based on a phase rotation of the symbol represented by the symbol identification, where the phase rotation of the symbol is requested to be acquired from the receiver based on the symbol identification.

The implementation is analogous to a conventional SLM algorithm, and will not be described in detail here.

In the embodiment of the application, the improved SLM algorithm unit directly acquires the phase rotation of the symbol through seventh channel coding. Alternatively, the modified SLM algorithm may obtain the phase rotation of the symbol from the receiver based on the symbol identification in the seventh channel coding. The modified SLM algorithm determines whether the PAPR value of the first decision region corresponding to the phase rotation of the symbol is recorded in the modified SLM algorithm and allows demodulation.

In this embodiment of the present application, before the modified SLM algorithm unit receives the seventh channel code sent by the conventional SLM algorithm unit, the modified SLM algorithm unit records the PAPR values supported by the signal sequences of the K decision regions, so that a PAPR selection carrier may be provided for the symbols of the K decision regions.

In the embodiment of the present application, the PAPR value data supported by the signal sequences of the K decision areas are synchronized to the improved SLM algorithm unit in real time. When the PAPR value supported by the first signal sequences of the K judgment areas changes, the changed first signal sequences inform the conventional SLM algorithm unit so that the conventional SLM algorithm unit updates the PAPR value supported by the first signal sequences recorded by the conventional SLM algorithm unit; the conventional SLM algorithm unit, upon receiving a notification from the signal sequence, notifies the modified SLM algorithm unit such that the modified SLM algorithm unit updates the PAPR values supported by the first signal sequence recorded by the modified SLM algorithm unit.

Optionally, the changing the PAPR value supported by the signal sequences of the K decision areas includes: adding a signal sequence in the K judgment areas, wherein the added signal sequence supports one or more PAPR values; one or more PAPR values supported by an existing signal sequence of the K decision regions are changed (e.g., added, replaced, or removed); one signal sequence is removed from the K decision regions, and the removed signal sequence supports one or more PAPR values.

S104, the improved SLM algorithm unit sends the indication information of the first PAPR value and the identification of the second signal sequence to the conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the indication information of the first PAPR value and the identification of the second signal sequence sent by the improved SLM algorithm unit; the first PAPR value is a PAPR value which is selected from PAPR values recorded in the improved SLM algorithm unit and allows the code element to demodulate the first decision area and meets the preset condition, and the second signal sequence is a signal sequence configured in the first PAPR value.

In the embodiment of the present application, the indication information of the first PAPR value and the identifier of the second signal sequence are used to determine the target signal sequence.

In some embodiments of the present application, the improved SLM algorithm unit determines whether the PAPR value of the first decision region is allowed for symbol demodulation in the PAPR values corresponding to the phase rotation of the symbols; if yes, determining a first PAPR value from the PAPR values of the first decision area for allowing the code element to demodulate; if not, the first PAPR value may be selected for the symbol based on the serial-to-parallel conversion carrier to which the symbol is subscribed.

In the embodiment of the invention, a PAPR value representation is recorded in a conventional SLM algorithm unit: the conventional SLM algorithm unit records information of the PAPR value.

At the transmitting end, input data is subjected to channel coding, serial-parallel conversion and phase factor weighting, modulated and mapped to corresponding signal constellation points, IFFT modulated on N subcarriers, and PAPR value is selected from U time domain signal sequences for transmission. At the receiving end, the received information is subjected to FFT conversion, then phase information is extracted from the frequency domain data symbols after FFT conversion through phase estimation and phase extraction, then the data symbols without the phase information are subjected to demodulation mapping to recover a codeword sequence, and the input information sequence is decoded by a decoder.

At the transmitting end, the phase information of the selected PAPR value branch must be transmitted to the receiver in the form of side information, so that the receiver can correctly demodulate the transmitted signal and recover the original information, and therefore, the processing of the side information is very important for the realization of the SLM algorithm. This necessarily results in a decrease in the spectral efficiency of the system if the side information is transmitted using separate sub-channels. The PTS method is used for reducing the detection scheme of the PAPR of the OFDM system, the scheme is modified and then applied to the SLM algorithm, the algorithm does not need to use a separate sub-channel to transmit the side information, and the receiver can recover the side information more reliably.

The following describes in detail the implementation flow of the SLM optimization method for reducing the PAPR of the OFDM system provided in the embodiment of the present application.

Fig. 2 is a schematic flowchart of an SLM optimization method for reducing PAPR of an OFDM system according to an embodiment of the present application. As shown in fig. 2, the SLM optimization method for reducing PAPR of the OFDM system provided in the embodiment of the present application includes, but is not limited to, steps S201 to S203. Possible implementations of this embodiment of the method are described further below.

The channel coding includes symbol identification and phase information of the symbols.

S201, the first signal sequence sends an eighth channel code to the receiver, the receiver receives the eighth channel code sent by the first signal sequence, the eighth channel code comprises a symbol identifier, and the eighth channel code is used for acquiring the phase rotation of a symbol of the symbol identifier.

In this embodiment, the eighth channel code is used to obtain the phase rotation angle of the PAPR value ordered by the symbol, that is, the phase rotation of the symbol, where the phase rotation of the symbol includes one or more phase rotation angles.

S202, the receiver transmits the phase rotation of the code element to the first signal sequence, and the first signal sequence receives the phase rotation of the code element transmitted by the receiver.

S203, if the first signal sequence can not provide carriers for all PAPR values corresponding to the phase rotation of the code element, the first channel coding is sent to a conventional SLM algorithm unit, wherein the first channel coding comprises the phase information of the code element and the phase rotation of the code element.

In the embodiment of the present application, the phase rotation angle of the PAPR value supported by the first signal sequence is recorded in the first signal sequence. If the first signal sequence determines that the first signal sequence cannot provide carriers for all PAPR values corresponding to the phase rotation of the symbol according to the phase rotation of the symbol, i.e. all phase rotation angles in the phase rotation of the symbol, the first channel code is sent to a conventional SLM algorithm unit.

In some embodiments of the present application, the registration channel coding further includes a requested phase rotation angle of the symbol, the requested phase rotation angle being used to select a PAPR value for the symbol. The first channel coding message further includes a requested phase rotation angle of the symbol, and if the first signal sequence cannot provide carriers for all PAPR values corresponding to one or more phase rotation angles present in both the phase rotation and the requested phase rotation angle, the first channel coding is sent to a conventional SLM algorithm unit.

S204, the conventional SLM algorithm unit determines whether information allowing the code element to demodulate the PAPR value of a first judgment area is recorded in the conventional SLM algorithm unit, wherein the first judgment area is characterized by the phase information, and the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in the conventional SLM algorithm unit.

In embodiments of the present application, the first channel coding may further include phase rotation of the symbols and/or symbol identification. In addition, the first channel code may further include a requested phase rotation angle of the symbol.

S205, if the conventional SLM algorithm unit determines that the PAPR value that allows the symbol to demodulate the first decision region is not recorded in the conventional SLM algorithm unit, the conventional SLM algorithm unit sends a seventh channel code to the modified SLM algorithm unit, where the seventh channel code includes phase information of the symbol and phase rotation of the symbol, and the seventh channel code is used to request the modified SLM algorithm unit to select the PAPR value that allows the symbol to demodulate in the first decision region.

Wherein, the improved SLM algorithm unit records PAPR values supported by signal sequences of K decision areas, the K decision areas comprise a first decision area, and K is a positive integer greater than 1.

In some embodiments of the present application, the phase rotation angle of the PAPR value supported by the signal sequence in the first decision region is recorded in a conventional SLM algorithm unit. The conventional SLM algorithm unit obtains the phase rotation angle of the PAPR value ordered by the symbol, that is, the phase rotation of the symbol, and according to the phase rotation of the symbol and the phase information, it can be determined whether the PAPR value of the first decision area allowed to be demodulated recorded by the conventional SLM algorithm unit exists in all the PAPR values corresponding to the phase rotation of the symbol.

In some embodiments of the present application, the conventional SLM algorithm unit is the first OFDM system standard of the above K decision regions, and the modified SLM algorithm unit is the second OFDM system standard. If the symbol is a global symbol, the PAPR value ordered by the global symbol is not recorded on the conventional SLM algorithm unit; if the symbol is a serial-to-parallel conversion symbol in other decision regions, the conventional SLM algorithm unit may not record the PAPR value subscribed to by the symbol. Since the improved SLM algorithm holds both information of the PAPR values supported by the signal sequences of the K decision regions and information of the PAPR values supported by the global signal sequences, in both cases the conventional SLM algorithm may request the improved SLM algorithm to provide the PAPR selection carrier for the symbol.

In embodiments of the present application, the seventh channel coding may further include phase rotation of the symbols and/or symbol identification. In addition, the seventh channel code may further include a requested phase rotation angle of the symbol.

S206, the improved SLM algorithm unit selects PAPR values allowing demodulation of the first decision area from PAPR values recorded in the improved SLM algorithm unit.

It will be appreciated that the modified SLM algorithm records information of PAPR values supported by the signal sequence of the first decision region and information of PAPR values to which symbols are subscribed. Therefore, based on the phase rotation of the symbol and the above-described phase information, it can be determined whether or not there is a PAPR value that allows demodulation of the first decision region among all the PAPR values corresponding to the phase rotation of the symbol.

In some embodiments of the present application, if the PAPR value to which the symbol is subscribed includes a PAPR value allowing the symbol to be demodulated in the first decision region, the first PAPR value is a predetermined condition selected by the modified SLM algorithm unit from the PAPR values allowing the symbol to be demodulated in the first decision region in the PAPR to which the symbol is subscribed. If the PAPR value ordered by the code element does not contain the PAPR value allowing the code element to be demodulated in the first judgment area, the first PAPR value is the PAPR value allowing the code element to be demodulated in the first judgment area, which meets the preset condition, is selected from the PAPR values recorded in the improved SLM algorithm unit according to the serial-parallel conversion mapping table. Wherein the serial-to-parallel conversion mapping table includes a mapping relationship between a phase rotation of the symbol and an allowable phase rotation angle of the symbol, and the allowable phase rotation angle of the symbol includes a phase rotation angle of a PAPR value allowing the symbol to be demodulated in the first decision region.

It can be understood that if the symbol subscribes to the serial-to-parallel conversion carrier, when the PAPR value to which the symbol subscribes does not include the PAPR value allowing the symbol to be demodulated in the first decision region, and it is determined that the symbol subscribes to the related serial-to-parallel conversion carrier according to the subscription information stored in the receiver by the symbol, the PAPR value may be selected for the symbol according to the serial-to-parallel conversion mapping table.

S207, the improved SLM algorithm unit sends indication information of a first PAPR value and identification of a second signal sequence to the conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the indication information of the first PAPR value and the identification of the second signal sequence sent by the improved SLM algorithm unit, wherein the second signal sequence is configured in the first PAPR value.

S208, the indication information of the first PAPR value and the identification of the second signal sequence sent by the conventional SLM algorithm unit to the first signal sequence, wherein the first signal sequence receives the indication information of the first PAPR value and the identification of the second signal sequence sent by the conventional SLM algorithm unit.

Optionally, the second signal sequence comprises one or more signal sequences configured in the first PAPR value.

S209, if the first signal sequence determines that the first signal sequence can not provide carrier waves for the first PAPR according to the indication information of the first PAPR, determining the identification of the target signal sequence according to the identification of the second signal sequence.

S210, the first signal sequence sends the registration channel code from the high-power amplifier to the target signal sequence, and the target signal sequence receives the registration channel code sent by the first signal sequence.

In some embodiments of the present application, after the first signal sequence receives the phase rotation angle of the first PAPR value sent by the conventional SLM algorithm unit, if the first signal sequence determines that the first signal sequence may provide a carrier for the first PAPR value according to the phase rotation angle of the PAPR value recorded by the first signal sequence, the first signal sequence is used as the target signal sequence. If the first signal sequence determines that the first signal sequence can not provide carrier for the first PAPR value and the second signal sequence only comprises one signal sequence, determining that the second signal sequence is the target signal sequence, and transmitting the registration channel code from the high-power amplifier to the target signal sequence by the first signal sequence. If the first signal sequence determines that the first signal sequence cannot provide a carrier for the first PAPR value and the second signal sequence only includes a plurality of signal sequences, the first signal sequence may send a channel code to the NRF, request to determine an identity of a target signal sequence according to the identity of the second signal sequence, and send a registered channel code from the high power amplifier to the target signal sequence.

In this embodiment of the present application, before the modified SLM algorithm unit receives the seventh channel code transmitted by the conventional SLM algorithm unit, the PAPR value data supported by the signal sequences of the K decision regions is synchronized to the modified SLM algorithm unit, so that the modified SLM algorithm unit may provide the PAPR selection carrier for the symbols of the K decision regions. The following describes in detail the synchronization of PAPR value data.

As shown in fig. 3, the SLM optimization method for reducing PAPR of the OFDM system provided in the embodiment of the present application further includes, but is not limited to, steps S301 to S303 before the modified SLM algorithm unit receives the seventh channel code transmitted by the conventional SLM algorithm unit. Possible implementations of this embodiment of the method are described further below.

S301, a first signal sequence sends a ninth channel code to a conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the ninth channel code sent by the first signal sequence, wherein the ninth channel code comprises identification of the first signal sequence and information of PAPR values supported by the first signal sequence; the ninth channel code is used to request the conventional SLM algorithm to add the PAPR values supported by the first signal sequence to the PAPR values recorded by the conventional SLM algorithm.

S302, a conventional SLM algorithm unit sends a second channel code to an improved SLM algorithm unit, the improved SLM algorithm unit receives the second channel code sent by the conventional SLM algorithm unit, and the second channel code comprises information of identification of the conventional SLM algorithm unit, identification of a first signal sequence and PAPR value supported by the first signal sequence; the second channel code is used to request the modified SLM algorithm to add the PAPR values supported by the first signal sequence to the PAPR values recorded by the modified SLM algorithm.

S303, the improved SLM algorithm unit adds the PAPR value supported by the first signal sequence to the PAPR value recorded by the improved SLM algorithm unit.

Optionally, the ninth channel coding further comprises identification of a signal sequence of the PAPR value configuration supported by the first signal sequence. The PAPR values supported by the first signal sequence of the improved SLM algorithm unit include: and recording information of the PAPR value supported by the first signal sequence and the identification of the signal sequence of the PAPR value configuration supported by the first signal sequence.

It can be understood that the first signal sequence is a signal sequence newly added to the first decision area, and when a signal sequence is newly added to the first decision area, the newly added signal sequence transmits channel codes to the conventional SLM algorithm unit to inform the conventional SLM algorithm unit to record the PAPR value supported by the newly added signal sequence. The conventional SLM algorithm unit records the PAPR value supported by the newly added signal sequence and simultaneously sends channel codes to the improved SLM algorithm unit so as to synchronously add the PAPR value supported by the newly added signal sequence into the improved SLM algorithm unit by taking the signal sequence as granularity. The PAPR values supported by the newly added signal sequence are recorded in the modified SLM algorithm unit in the PAPR values corresponding to the conventional SLM algorithm unit.

Optionally, after the improved SLM algorithm adds the PAPR value supported by the first signal sequence to the PAPR value recorded by the improved SLM algorithm, the method further includes:

s304, the first signal sequence sends tenth channel codes to a conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the tenth channel codes sent by the first signal sequence, wherein the tenth channel codes comprise the identification of the first signal sequence and the information of the second PAPR value; the tenth channel code is used to request the conventional SLM algorithm to add the second PAPR value to the PAPR value supported by the first signal sequence.

S305, the conventional SLM algorithm unit sends a third channel code to the improved SLM algorithm unit, and the improved SLM algorithm unit receives the third channel code sent by the conventional SLM algorithm unit, wherein the third channel code comprises information of identification of the conventional SLM algorithm unit, identification of a first signal sequence and a second PAPR value; the third channel coding is used to request the modified SLM algorithm to add the second PAPR value to the PAPR value supported by the first signal sequence.

S306, the improved SLM algorithm unit records the second PAPR value into the PAPR value supported by the first signal sequence.

Optionally, the tenth channel code further comprises an identification of a signal sequence of the second PAPR value configuration. The improved SLM algorithm unit records the second PAPR value comprises: and recording the information of the second PAPR value and the identification of the signal sequence configured by the second PAPR value.

It may be understood that the second PAPR value is an newly added PAPR value that can be supported by the first signal sequence, and when the first signal sequence is newly added with one PAPR value, the first signal sequence sends a channel code to the conventional SLM algorithm unit to inform the conventional SLM algorithm unit to record the newly added PAPR value of the first signal sequence. The conventional SLM algorithm unit records the new PAPR value of the first signal sequence and simultaneously transmits a channel code to the modified SLM algorithm unit to synchronously add the new PAPR value of the first signal sequence to the modified SLM algorithm unit. The newly added second PAPR value is recorded in the modified SLM algorithm unit in the PAPR value of the first signal sequence corresponding to the conventional SLM algorithm unit.

s307, the first signal sequence sends eleventh channel coding to a conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the eleventh channel coding sent by the first signal sequence, wherein the eleventh channel coding comprises identification of the first signal sequence, indication information of a third PAPR value and information of a fourth PAPR value; the eleventh channel code is used to request the conventional SLM algorithm unit to replace the third PAPR value supported by the first signal sequence with a fourth PAPR value.

S308, the conventional SLM algorithm unit sends a fourth channel code to the improved SLM algorithm unit, and the improved SLM algorithm unit receives the fourth channel code sent by the conventional SLM algorithm unit, wherein the fourth channel code comprises the identification of the conventional SLM algorithm unit, the identification of the first signal sequence, the indication information of the third PAPR value and the information of the fourth PAPR value; the fourth channel code is used to request the modified SLM algorithm to replace the third PAPR value supported by the first signal sequence with a fourth PAPR value.

S309, the modified SLM algorithm replaces the third PAPR value supported by the first signal sequence recorded by the modified SLM algorithm with a fourth PAPR value.

Optionally, the eleventh channel code further comprises an identification of a signal sequence of the fourth PAPR value configuration. The improved SLM algorithm unit records a fourth PAPR value comprising: and recording information of the fourth PAPR value and identification of a signal sequence configured by the fourth PAPR value.

It is understood that the fourth PAPR value is a new PAPR value supported by the first signal sequence and the third PAPR value is an old PAPR value supported by the first signal sequence that is replaced with the fourth PAPR value. When the third PAPR value supported by the first signal sequence is replaced by the fourth PAPR value, the first signal sequence cannot support the third PAPR value. When a PAPR value of the first signal sequence is replaced and updated, the first signal sequence sends channel codes to the conventional SLM algorithm unit so as to inform the conventional SLM algorithm unit to record the PAPR value after the replacement and update of the first signal sequence. The conventional SLM algorithm unit records the PAPR values after the first signal sequence substitution and simultaneously transmits channel codes to the modified SLM algorithm unit to synchronize the PAPR values after the first signal sequence substitution to the modified SLM algorithm unit. The fourth PAPR value is recorded in the modified SLM algorithm unit in the PAPR value of the first signal sequence corresponding to the conventional SLM algorithm unit.

s310, the first signal sequence sends a twelfth channel code to a conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the twelfth channel code sent by the first signal sequence, wherein the twelfth channel code comprises identification of the first signal sequence and indication information of a fifth PAPR value; the twelfth channel code is used to ask the conventional SLM algorithm to remove the fifth PAPR value from the PAPR values supported by the first signal sequence.

In the embodiment of the application, if it is determined that the conventional SLM algorithm unit does not record the information of the PAPR value to which the symbol is subscribed, the conventional SLM algorithm unit may transmit a channel code to the modified SLM algorithm unit to request the modified SLM algorithm unit to provide the PAPR selection carrier for the symbol. In the embodiment of the present application, only the PAPR values supported by the signal sequences in the first decision area are recorded in the conventional SLM algorithm unit, and the PAPR values supported by the signal sequences in all the decision areas are recorded in the improved SLM algorithm unit, so that the improved SLM algorithm unit can provide the PAPR selection carrier for the symbol. By implementing the method and the device, the risk of overload of the OFDM system is reduced, the access delay of the code element is reduced, and the code element experience is effectively improved. In addition, the PAPR value data supported by the signal sequences of all the judgment areas are automatically synchronized only on the improved SLM algorithm unit, the proposal has low cost and quick response, and can avoid manual misoperation.

Considering that the system is to perform radio frequency transmission on a transmission signal, when the transmission signal passes through a High Power Amplifier (HPA), nonlinear distortion is generated, which may cause degradation of system performance. The main purpose of reducing PAPR is to reduce the effect of nonlinear HPA on OFDM signal to a limited extent. To reduce this effect, the signal must be subjected to an appropriate predistortion process before reaching the HPA.

As shown in fig. 4, the SLM optimization method for reducing PAPR of the OFDM system based on scene one provided in the embodiment of the present application includes, but is not limited to, steps S401 to S408. Possible implementations of this embodiment of the method are described further below.

S401, a first local code element transmits a registration channel code to a first global signal sequence through a high-power amplifier in a judging area 1, wherein the first global signal sequence receives the registration channel code transmitted by the high-power amplifier, and the registration channel code comprises a code element identifier of the first local code element and phase information of the first local code element.

In this embodiment of the present application, the attribution of the first local symbol is a decision area i, where the phase information characterizes the decision area 1, and the decision area i may be the decision area 1, or may be other decision areas in the K decision areas, which is not specifically limited herein.

S402, the first global signal sequence sends an eighth channel code to the receiver, the receiver receives the eighth channel code sent by the first global signal sequence, the eighth channel code comprises a symbol identifier of a first local symbol, and the eighth channel code is used for acquiring phase rotation of the first local symbol.

S403, the receiver sends the phase rotation of the first local code element to the first global signal sequence, and the first global signal sequence receives the phase rotation of the first local code element sent by the receiver.

S404, if the first global signal sequence can not provide carriers for all PAPR values corresponding to the phase rotation of the local code element, the first global signal sequence sends a first channel code to a second OFDM system standard, and the second OFDM system standard receives the first channel code sent by the first global signal sequence, wherein the first channel code comprises the phase information of the first local code element and the phase rotation of the first local code element.

In some embodiments of the present application, the first channel code may further include parameters such as a requested phase rotation angle of the first local symbol and/or a symbol identification of the first local symbol.

It will be appreciated that the first global signal sequence is used to provide mobile and demodulation carriers for the global symbols, and that the first global signal sequence cannot provide carriers for all PAPR values corresponding to the phase rotation of the local symbols.

S405, the second OFDM system standard selects a first PAPR value allowing the first local symbol to demodulate the decision area 1 from the PAPR values recorded in the second OFDM system standard according to the phase rotation of the first local symbol.

S406, the second OFDM system standard sends the phase rotation angle of the first PAPR value and the identification of the second signal sequence to the first global signal sequence, the first global signal sequence receives the phase rotation angle of the first PAPR value and the identification of the second signal sequence sent by the second OFDM system standard, and the second signal sequence is the signal sequence configured in the first PAPR value.

S407, if the first signal sequence determines that the first signal sequence can not provide carrier waves for the first PAPR value according to the phase rotation angle of the first PAPR value, determining the identification of the target signal sequence according to the identification of the second signal sequence.

S408, the first signal sequence sends the registration channel code from the high-power amplifier to the target signal sequence, and the target signal sequence receives the registration channel code sent by the first signal sequence.

As shown in fig. 5, the SLM optimization method for reducing PAPR of the OFDM system based on the second scene provided in the embodiment of the present application includes, but is not limited to, steps S501 to S508. Possible implementations of this embodiment of the method are described further below.

S501, a first local code element belonging to a judgment area i sends a registration channel code to a first local signal sequence through a high-power amplifier in a judgment area 1, the first local signal sequence receives the registration channel code sent by the high-power amplifier, and the registration channel code comprises a code element identification of the first local code element of the judgment area i and phase information of the first local code element.

S502, the first local signal sequence sends an eighth channel code to the receiver, the receiver receives the eighth channel code sent by the first local signal sequence, the eighth channel code comprises a first local symbol mark, and the eighth channel code is used for acquiring the phase rotation of a first local symbol corresponding to the symbol mark.

S503, the receiver transmits the phase rotation of the first local symbol to the first local signal sequence, and the first local signal sequence receives the phase rotation of the first local symbol transmitted by the receiver.

S504, if the first local signal sequence cannot provide carriers for all PAPR values corresponding to the phase rotation of the first local symbol, the first channel code is sent to the first OFDM system standard 1 in the decision area 1, where the first channel code includes the phase information of the first local symbol and the phase rotation of the first local symbol.

It will be appreciated that the first local symbol is a serial-to-parallel transformed symbol from among the K decision regions described above, except for decision region 1, and that the first local signal sequence may not be able to provide carriers for all PAPR values corresponding to the phase rotation of the first local symbol.

S505, if the first OFDM system standard 1 determines that all the PAPR values corresponding to the phase rotations of the first local symbol are not recorded in the first OFDM system standard 1, the first OFDM system standard 1 sends a seventh channel code to the second OFDM system standard, where the seventh channel code is used to request the second OFDM system standard to select the PAPR value that allows the first local symbol to demodulate the decision area 1.

It will be appreciated that the first local symbol is a serial-to-parallel conversion symbol from the K decision regions described above except for decision region 1, and thus, all PAPR values corresponding to the phase rotation of the first local symbol may not be recorded in the first OFDM system standard 1. The second OFDM system standard records the PAPR values supported by the signal sequences of the K decision regions, and thus the second OFDM system standard records all the PAPR values corresponding to the phase rotations of the first local symbols. The second OFDM system standard may provide a PAPR select carrier for the first local symbol.

S506, the second OFDM system standard selects a first PAPR value meeting a preset condition to allow the first local code element to demodulate the decision area 1 from PAPR values recorded by the second OFDM system standard according to the phase rotation of the first local code element.

S507, the second OFDM system standard sends the phase rotation angle of the first PAPR value and the identification of the second local signal sequence to the first OFDM system standard 1, the first OFDM system standard 1 receives the phase rotation angle of the first PAPR value and the identification of the second local signal sequence sent by the second OFDM system standard, and the second local signal sequence is the signal sequence configured in the first PAPR value.

S508, the first OFDM system standard 1 sends the phase rotation angle of the first PAPR value and the identification of the second local signal sequence to the first local signal sequence, and the first local signal sequence receives the phase rotation angle of the first PAPR value and the identification of the second local signal sequence sent by the first OFDM system standard 1.

Fig. 6 is a schematic structural diagram of an SLM optimization system for reducing PAPR of an OFDM system according to an embodiment of the present invention. As shown in fig. 6, the SLM optimization system 10 for reducing PAPR of an OFDM system includes: a first receiving unit 11 and a second receiving unit 12.

A first receiving unit 11 for receiving a first channel code from the first signal sequence, the first channel code comprising phase information of the symbols.

The first receiving unit 12 is further configured to receive, if it is determined that the SLM optimization system for reducing the PAPR of the OFDM system does not record information for allowing the symbol to demodulate the PAPR value of the first decision region, indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm unit; the first PAPR value is a PAPR value which is obtained by selecting an allowable symbol meeting a preset condition from PAPR values recorded in the improved SLM algorithm unit and is demodulated in a first decision area, wherein the first decision area is a decision area represented by phase information.

And identifying the identification of the judgment area of the PAPR value carrier wave, wherein the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in an SLM optimization system for reducing the PAPR of the OFDM system, and the information of the PAPR value supported by the signal sequence of K judgment areas is recorded on an improved SLM algorithm unit, wherein the K judgment areas comprise the first judgment area, and K is a positive integer larger than 1.

In one implementation, the first channel coding further includes phase rotation of the symbols; the first receiving unit 11 is specifically configured to: if it is determined that the SLM optimizing system that reduces the PAPR of the OFDM system does not record information that allows the PAPR value of the first decision area to be demodulated by the above-mentioned symbol according to the phase rotation of the symbol, the indication information of the first PAPR value and the identification of the second signal sequence from the modified SLM algorithm unit are received.

In one implementation, the first channel coding further includes symbol identification; the first receiving unit 11 is specifically configured to: if it is determined that the SLM optimizing system that reduces the PAPR of the OFDM system does not record information that allows the PAPR value of the symbol demodulation first decision area based on the phase rotation of the symbol characterized by the symbol identification, then the indication information of the first PAPR value and the identification of the second signal sequence from the modified SLM algorithm unit are received, and the phase rotation of the symbol is acquired by requesting the receiver based on the symbol identification.

In one implementation, before the first receiving unit 11 receives the first channel code from the first signal sequence, the SLM optimization system for reducing PAPR of the OFDM system further includes: a first transmitting unit, configured to transmit, to the modified SLM algorithm unit, a second channel code, where the second channel code includes an identification of the first signal sequence and information of a PAPR value supported by the first signal sequence, and the second channel code is configured to request the modified SLM algorithm unit to record the PAPR value supported by the first signal sequence into the PAPR value recorded by the modified SLM algorithm unit.

In one implementation, after the first sending unit sends the second channel code to the modified SLM algorithm unit, the first sending unit is further configured to: and transmitting a third channel code to the modified SLM algorithm unit, the third channel code comprising information of the second PAPR value and an identification of the first signal sequence, the third channel code being used to request the modified SLM algorithm unit to add the second PAPR value to the PAPR value supported by the first signal sequence.

In one implementation, after the first sending unit sends the second channel code to the modified SLM algorithm unit, the first sending unit is further configured to: and transmitting a fourth channel code to the improved SLM algorithm unit, wherein the fourth channel code comprises identification of the first signal sequence, indication information of the third PAPR value and information of the fourth PAPR value, and the fourth channel code is used for requesting the improved SLM algorithm unit to replace the third PAPR value supported by the first signal sequence with the fourth PAPR value.

In one implementation, after the first sending unit sends the second channel code to the modified SLM algorithm unit, the first sending unit is further configured to: and transmitting a fifth channel code to the improved SLM algorithm unit, the fifth channel code comprising an identification of the first signal sequence, an indication of a fifth PAPR value, the fifth channel code for requesting the improved SLM algorithm unit to remove the fifth PAPR value from the PAPR values supported by the first signal sequence.

In one implementation, after the first sending unit sends the second channel code to the modified SLM algorithm unit, the first sending unit is further configured to: a sixth channel code is transmitted to the modified SLM algorithm, the sixth channel code comprising an identification of the first signal sequence, the sixth channel code for requesting the modified SLM algorithm to remove PAPR values supported by the first signal sequence from the PAPR values recorded by the modified SLM algorithm.

In one implementation, the indication information of the PAPR value includes a phase rotation angle of the PAPR value.

In one implementation, the improved SLM algorithm unit further records information of a PAPR value supported by a global signal sequence, where the global signal sequence provides demodulation and mobility management carriers for a global symbol, and the PAPR value subscribed by the global symbol is allowed to demodulate M decision regions of the K decision regions, where M is a positive integer greater than 1 and less than or equal to K.

In one implementation, the symbol is a global symbol.

In one implementation, the phase information of the symbol is the TA information of the symbol.

Improving PAPR performance obtained for SLM and conventional SLM given u=2, 4, 8. In the simulation result, the PAPR of the OFDM signal can be effectively reduced by improving the SLM algorithm, and the better the PAPR reducing performance of the system is along with the increase of the branch number U, the performance of the system is equivalent to that of the conventional SLM algorithm. When u=8 and the threshold of papr is 7dB, the probabilities of the improved SLM and conventional SLM algorithms exceeding the threshold are 0.75% and 0.25%, respectively.

Embodiments of the present application also provide a computer-readable storage medium. The methods described in the above method embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer readable media can include computer storage media and communication media and can include any medium that can transfer a computer program from one place to another. A storage media may be any available media that can be accessed by a computer.

Those skilled in the art will appreciate that various modifications and improvements can be made to the disclosure. For example, the various devices or components described above may be implemented in hardware, or may be implemented in software, firmware, or a combination of some or all of the three.

A flowchart is used in this disclosure to describe the steps of a method according to an embodiment of the present disclosure. It should be understood that the steps that follow or before do not have to be performed in exact order. Rather, the various steps may be processed in reverse order or simultaneously. Also, other operations may be added to these processes.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the methods described above may be implemented by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiment may be implemented in the form of hardware, or may be implemented in the form of a software functional module. The present disclosure is not limited to any specific form of combination of hardware and software.

Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof. Although a few exemplary embodiments of this disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this disclosure. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the claims. It is to be understood that the foregoing is illustrative of the present disclosure and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The disclosure is defined by the claims and their equivalents.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An SLM optimization method for reducing PAPR of an OFDM system, comprising:

if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm;

The information of the PAPR value comprises indication information of the PAPR value, identification of a signal sequence configured in the PAPR value and identification of a judgment area of the PAPR value carrier wave, the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in the conventional SLM algorithm unit, the information of the PAPR value supported by the signal sequence of K judgment areas is recorded in the improved SLM algorithm unit, the K judgment areas comprise the first judgment area, and K is a positive integer larger than 1;

if no record is present, the conventional SLM algorithm unit transmits a seventh channel code to the modified SLM algorithm unit, the modified SLM algorithm unit receives the seventh channel code transmitted by the conventional SLM algorithm unit, the seventh channel code including phase information of the symbol, the seventh channel code being used to request the modified SLM algorithm unit to select a PAPR value for the symbol;

the improved SLM algorithm unit sends the indication information of the first PAPR value and the identification of the second signal sequence to the conventional SLM algorithm unit, and the conventional SLM algorithm unit receives the indication information of the first PAPR value and the identification of the second signal sequence sent by the improved SLM algorithm unit; the indication of the first PAPR value and the identification of the second signal sequence are used to determine the target signal sequence.

2. The method of claim 1, wherein the first channel coding further comprises a signed PAPR selection assistance information phase rotation angle for the symbols; if it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region, the conventional SLM algorithm receives indication information of the first PAPR value and identification of the second signal sequence from the modified SLM algorithm, comprising:

If it is determined that the conventional SLM algorithm does not record information allowing the symbol to demodulate the PAPR value of the first decision region based on the phase rotation of the symbol characterized by the symbol identity, the conventional SLM algorithm receives indication information of the first PAPR value and an identity of the second signal sequence from the modified SLM algorithm, the phase rotation of the symbol being requested by the conventional SLM algorithm to be acquired from a receiver based on the symbol identity.

3. The method of claim 2, the OFDM system further comprising, prior to receiving the first channel code from the first demodulated and modulated signal sequence using a conventional SLM algorithm unit:

The conventional SLM algorithm unit transmits a third channel code to the modified SLM algorithm unit, the third channel code comprising information of an identification of the first signal sequence, a second PAPR value, the third channel code for requesting the modified SLM algorithm unit to record the second PAPR value into the PAPR value supported by the first signal sequence.

4. The method of claim 3, after the conventional SLM algorithm unit transmits a second channel code to the modified SLM algorithm unit, the method further comprising:

5. The method of claim 4, wherein after the conventional SLM algorithm unit transmits a second channel code to the modified SLM algorithm unit, the method further comprises:

the symbol is a global symbol.

6. An SLM optimization system for reducing PAPR of an OFDM system, comprising:

A first receiving unit, configured to receive, if it is determined that the SLM optimization system for reducing PAPR of the OFDM system does not record information for allowing the symbol to demodulate the PAPR value of the first decision region, indication information of the first PAPR value and an identification of the second signal sequence from the modified SLM algorithm unit; the first PAPR value is a PAPR value which meets a preset condition and allows the code element to be demodulated in the first judgment area is selected from PAPR values recorded in the improved SLM algorithm unit, the first judgment area is a judgment area represented by the phase information, and the second signal sequence is a signal sequence configured in the first PAPR value;

the information of the PAPR value comprises indication information of the PAPR value, identification of a signal sequence configured in the PAPR value and identification of a judgment area of a carrier wave of the PAPR value, the information of the PAPR value supported by the signal sequence in the first judgment area is recorded in an SLM optimization system for reducing the PAPR of the OFDM system, the information of the PAPR value supported by the signal sequence of K judgment areas is recorded on an improved SLM algorithm unit, the K judgment areas comprise the first judgment area, and K is a positive integer larger than 1;

7. The SLM optimization system for PAPR reduction in an OFDM system of claim 6, wherein said first channel coding further comprises a signed PAPR selection assistance information phase rotation angle for said symbols;

The first channel code further includes a symbol identification of the symbol;

8. The SLM optimization system for PAPR reduction in an OFDM system of claim 7, wherein said SLM optimization system for PAPR reduction in an OFDM system further comprises, prior to said first receiving unit receiving a first channel code from a first demodulated and modulated signal sequence:

9. The SLM optimization system for PAPR reduction in an OFDM system according to claim 8, wherein said first transmitting unit is further configured to, after said first transmitting unit transmits a second channel code to said modified SLM algorithm unit:

10. The SLM optimization system for PAPR reduction in an OFDM system according to claim 9, wherein said first transmitting unit is further configured to, after said first transmitting unit transmits a second channel code to said modified SLM algorithm unit:

The symbol is a global symbol.