CN115865132A - Pilot frequency self-adaption method, communication system, equipment and storage medium - Google Patents
Pilot frequency self-adaption method, communication system, equipment and storage medium Download PDFInfo
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- CN115865132A CN115865132A CN202211474604.0A CN202211474604A CN115865132A CN 115865132 A CN115865132 A CN 115865132A CN 202211474604 A CN202211474604 A CN 202211474604A CN 115865132 A CN115865132 A CN 115865132A
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- pilot frequency
- seed number
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the technical field of communication, in particular to a pilot frequency self-adaption method, a communication system, equipment and a storage medium. The pilot frequency self-adaptive method comprises the following steps: determining a seed number for generating a pilot sequence according to a channel condition; appending a seed number in a frame control field; generating a pilot frequency sequence according to the seed number; and inserting pilot frequency information in the corresponding position of the frame load symbol according to the pilot frequency sequence. Receiving and demodulating a frame control word, and extracting a seed number in the frame control word; and determining the pilot frequency position according to the seed number, extracting the pilot frequency, and demodulating the frame load according to the pilot frequency. Wherein, the appending of the seed number in the frame control field includes: generating a frame control word according to a frequency band available for a current communication system; the seed number is embedded in a reserved field of the variable region of the frame control word. The pilot frequency self-adaptive method, the communication system, the device and the storage medium can realize the self-adaptive setting of the pilot frequency, reduce the overhead of the communication system and improve the processing speed of the pilot frequency.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a pilot frequency self-adaption method, a communication system, equipment and a storage medium.
Background
With the wider and wider application of the power line carrier communication technology, the requirements of people on information transmission through the power line medium are more and more strict. IEEE1901, ITU-T G.9960, homePlug GP and national grid power line transmission standard (hereinafter referred to as national grid standard) based on OFDM technology are produced.
The above protocols have taken some means in terms of channel adaptation, but all have some disadvantages. When the channel condition changes, some protocols adjust the transmission rate through the detection of the application layer on the packet receiving rate, so that the transmission robustness is improved, but the response delay is generated to the change of the channel. In the prior art, a pilot frequency is inserted between data symbols by increasing a time domain pilot frequency symbol, so that certain channel variation can be corrected. However, such fixed pilots cannot reflect the changing channel, and there is always a fixed overhead, which has a large impact on the transmission rate.
Disclosure of Invention
The invention aims to provide a pilot frequency self-adaptive method, a communication system, equipment and a storage medium, which can dynamically adjust the overhead of the communication system according to the packet receiving rate, improve the pilot frequency processing speed and realize the self-adaptive setting of the pilot frequency.
In order to solve the technical problem, the present application provides the following technical solutions:
a pilot adaptation method, comprising:
determining a seed number for generating a pilot sequence according to a channel condition;
appending a seed number in a frame control field;
generating a pilot frequency sequence according to the seed number;
and inserting pilot frequency information in the corresponding position of the frame load symbol according to the pilot frequency sequence.
Further, still include:
receiving and demodulating a frame control word, and extracting a seed number in the frame control word;
determining a pilot frequency position according to the seed number and extracting the pilot frequency;
the frame payload is demodulated from the pilots.
Further, determining the seed number according to the channel condition includes:
detecting current channel parameters;
if the packet receiving rate is lower than the preset value, selecting the pilot frequency sub-carriers with the occupation density larger than the preset value and the pilot frequency occupation frequency point arrangement dispersity larger than the preset value according to the polynomial of the pilot frequency sequence;
and if the packet receiving rate is greater than the preset value, selecting the seed number of the random pilot frequency sequence.
Further, appending a seed number in the frame control field includes:
generating a frame control word according to a frequency band available for a current communication system;
the seed number is embedded in a reserved field of the variable region of the frame control word.
Further, receiving and demodulating the frame control word, and extracting the seed number in the frame control word includes:
and carrying out synchronization and channel estimation by receiving the frame lead code, demodulating a frame control word, analyzing the frame control word, and acquiring a seed number of a pilot frequency sequence from a reserved field of a variable region of the frame control word.
Further, generating the pilot sequence according to the seed number includes:
inputting the seed number into a pilot frequency sequence generator, and generating a pilot frequency sequence by the pilot frequency sequence generator;
the determining the pilot frequency position according to the seed number and extracting the pilot frequency comprises:
inputting the seed number into a pilot frequency sequence generator to obtain a pilot frequency position;
and extracting the pilot frequency according to the pilot frequency position.
Further, demodulating the frame payload according to the pilot comprises:
performing channel estimation according to the extracted pilot frequency;
and performing channel equalization according to the result of the channel estimation, and demodulating the frame load.
The present invention also provides a communication system comprising a transmitter and a receiver:
the transmitter is used for transmitting a frame control word, and a seed number corresponding to a pilot frequency sequence is attached to the frame control word;
the transmitter is also used for generating a pilot frequency sequence according to the seed number of the pilot frequency sequence and inserting pilot frequency information in a fixed position of a frame load symbol according to the pilot frequency sequence;
the transmitter is further configured to transmit a frame payload;
the receiver is used for receiving and demodulating the frame control word and acquiring a seed number from the frame control word;
the receiver is further configured to receive a frame payload;
the receiver is also used for obtaining a pilot frequency position according to the seed number and extracting the pilot frequency;
the receiver is further configured to demodulate the frame payload in accordance with the pilot.
The invention also discloses a communication device, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the processor executes the computer program to realize the pilot frequency self-adaption method.
The invention also discloses a storage medium, wherein a computer program is stored in the storage medium, and when the computer program is executed, the pilot frequency self-adaption method is realized.
In the technical scheme of the invention, the seed number is selected in a self-adaptive mode through the channel condition to realize the self-adaptive matching of the pilot frequency, and the targeted pilot frequency setting is carried out according to the current channel condition, thereby improving the communication quality and the transmission efficiency; because the seed number corresponds to the pilot frequency sequence, the transmission of the pilot frequency sequence information can be realized by adopting the seed number; the receiver can obtain the corresponding pilot frequency position according to the seed number. Compared with the prior art, the technical scheme of the invention has the advantages of channel self-adaption, low channel overhead and high processing speed.
Drawings
FIG. 1 is an exemplary frame format in an embodiment of the present invention;
FIG. 2 is a flow chart of the generation of control words for an exemplary frame in an embodiment of the present invention;
FIG. 3 is a format of a control word of an exemplary frame in an embodiment of the present invention;
FIG. 4 is a flow chart of an embodiment of a pilot adaptation method of the present invention;
FIG. 5 is a flow chart of data transmission steps of a transmitter in an embodiment of the present invention;
fig. 6 is a flow chart of the data receiving procedure of the receiver in the embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
as shown in fig. 1, this embodiment discloses a communication system, which is used to implement data communication between communication devices, where the communication system includes a transmitter and a receiver, and in this embodiment, taking a power line carrier communication system as an example, the transmitter and the receiver are both power line carrier communication devices, and the transmitter and the receiver communicate with each other through a power line carrier.
In this embodiment, the transmitter and the receiver perform data communication by using the pilot frequency adaptive method of the present application. Fig. 1 is a format of an exemplary frame for power line carrier communication in the present embodiment, where a complete frame is composed of several frame preamble symbols, several frame control word symbols, and several frame payload symbols. The frame preamble is a known sequence and available frequency bands are arranged at certain frequency intervals; the frame control word contains control information of the frame and occupies all the selected subcarriers; the frame payload contains the effective data and pilot of the frame, occupying all the sub-carriers of the frequency band.
The transmitter is used for generating and transmitting a frame control word; fig. 2 shows a process of generating control words of an exemplary frame according to this embodiment, where the total number of frame control words is 16Bytes, and the frame control words are Turbo encoded to 32Bytes. And after the encoded frame control word is subjected to channel interleaving and diversity copying, determining the number of symbols which can be occupied by the frame control word according to the number of copying times and the number of subcarriers of an available frequency band.
In this embodiment, the transmitter appends a seed number corresponding to the pilot sequence to the frame control word, specifically as shown in fig. 3, fig. 3 shows a format of the control word of the exemplary frame of this embodiment, and the frame control word is composed of a delimiter type, a network identifier, a variable area, a standard version number, a frame control check sequence, and the like. Wherein the variable region contains a reserved field. In this embodiment, the reserved field is extended to include the seed number of the pilot sequence.
The transmitter is also used for generating a pilot frequency sequence according to the seed number of the pilot frequency sequence and inserting pilot frequency information in a fixed position of a frame load symbol according to the pilot frequency sequence; the transmitter is further configured to transmit a frame payload;
the receiver is used for receiving and demodulating the frame control word and acquiring a seed number from the frame control word;
the receiver is further configured to receive a frame payload; the receiver is also used for obtaining a pilot frequency position according to the seed number and extracting the pilot frequency; the receiver is further configured to demodulate the frame payload based on the pilot.
As shown in fig. 4, a pilot adaptation method in this embodiment includes:
a data sending step: when the transmitter transmits the frame lead code, the frame control word and the frame load, the seed number corresponding to the pilot frequency sequence is added in the frame control word, and the pilot frequency is added in the data symbol according to the requirement of the pilot frequency sequence corresponding to the seed number.
A data receiving step: when receiving the frame control word, the receiver extracts the seed number from the frame control word, and then when receiving the data symbol, obtains the pilot frequency based on the seed number and assists in completing data demodulation.
As shown in fig. 5, the data sending step specifically includes:
the transmitter adaptively determines a seed number for generating a pilot sequence according to channel conditions; specifically, the transmitter detects the current channel parameters; the seed number of the pilot sequence is determined according to different communication efficiencies. For example, in this embodiment, the transmitter determines a packet receiving rate, and if the packet receiving rate is lower than a preset value, there are more retransmission times, the transmitter selects, according to a polynomial of a pilot sequence, a seed number corresponding to the pilot sequence whose pilot occupying frequency point has a distribution dispersity greater than the preset value, and selects a pilot subcarrier whose occupying density is greater than the preset value; if the packet receiving rate is larger than the preset value, the transmitter selects the seed number using the random pilot frequency sequence. Specifically, when the packet receiving rate is relatively low, in order to improve robustness, the transmitter may select a seed number containing more pilots in the pilot sequence, so that when the receiver receives the pilot sequence, the channel can be estimated more accurately through more pilots, so as to improve the accuracy of reception. When the packet receiving rate is high, in order to improve the transmission efficiency, the transmitter selects the seed number with less pilots included in the pilot sequence, so as to make the data occupy more transmission bands. The transmitter may also choose to use a random seed number when the packet reception rate is relatively high. If the occupation density of the pilot frequency sequences derived from the two seed numbers is almost the same, the transmitter can further evaluate the frequency point dispersion degree of the pilot frequency sequences, and the more dispersed pilot frequency can be better used for evaluating the channel.
After selecting the corresponding seed number, the transmitter constructs a frame control field and attaches the seed number in the frame control field; specifically, the transmitter generates a frame control word according to a frequency band available to the power line carrier communication system; the seed number is then embedded in a reserved field of the variable area of the frame control word. Then the transmitter copies the frame control word by diversity copy, after the frame control word is copied, it is processed and sent out through modulation, IFFT, cyclic shift and windowing.
When generating the frame payload symbol, the transmitter generates a pilot sequence according to the seed number, specifically, the seed number is input to a pilot sequence generator according to the seed sequence number of the pilot sequence, the pilot sequence generator generates a pilot sequence, and each symbol changes the pilot sequence once to determine the position of the pilot.
And inserting pilot frequency information at a pilot frequency position corresponding to the frame load symbol according to the pilot frequency sequence. The transmitter modulates the frame payload onto the available frequency band for transmission and inserts pilot information at fixed locations in each frame payload symbol as directed by the pilot sequence generator.
As shown in fig. 6, the data receiving step includes:
the receiver receives and demodulates the frame control word, and extracts the seed number in the frame control word; specifically, the frame control word is demodulated by receiving the frame preamble for synchronization and channel estimation, and the demodulation of the frame control word by the receiver includes diversity combining, channel deinterleaving, and Turbo decoding. After demodulating the frame control word, the receiver analyzes the frame control word according to the protocol specification, and obtains the seed number of the pilot frequency sequence from the reserved field of the variable region of the frame control word.
When demodulating the frame payload symbol, determining the pilot frequency position according to the seed number and extracting the pilot frequency, and demodulating the frame payload according to the pilot frequency. Specifically, the receiver inputs the seed number into the pilot frequency sequence generator to obtain the pilot frequency position; and passes it to the pilot sequence generator according to the pilot positions determined by the pilot sequence generator. And extracting the pilot frequency according to the pilot frequency position. Performing channel estimation according to the extracted pilot frequency; and then, receiving the frame load by using the result of the channel estimation, carrying out channel equalization according to the result of the channel estimation, and demodulating the frame load. The pilot sequence is shifted once per symbol to determine the position of the pilot.
The embodiment also discloses a storage medium, wherein a computer program capable of being executed by a processor is stored in the storage medium, and when the computer program is executed, the pilot frequency self-adaption method is realized.
The embodiment also discloses a communication device, which comprises a computer readable storage medium and a processor, wherein a computer program which can be run by the processor is stored in the computer readable storage medium, and when the processor executes the computer program, the pilot frequency self-adaption method is realized.
The foregoing are merely exemplary embodiments of the present invention, and no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the art, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice with the teachings of the invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A pilot adaptation method, characterized by: the method comprises the following steps:
determining a seed number for generating a pilot sequence according to a channel condition;
appending a seed number in a frame control field;
generating a pilot frequency sequence according to the seed number;
and inserting pilot frequency information in the corresponding position of the frame load symbol according to the pilot frequency sequence.
2. The method of claim 1, wherein: further comprising:
receiving and demodulating a frame control word, and extracting a seed number in the frame control word;
determining a pilot frequency position according to the seed number and extracting the pilot frequency;
the frame payload is demodulated from the pilots.
3. The method of claim 1, wherein: determining the seed number according to the channel condition includes:
detecting current channel parameters;
if the packet receiving rate is lower than a preset value, selecting a seed number corresponding to a pilot frequency sequence with the pilot frequency occupying frequency point arrangement dispersity being larger than the preset value according to a polynomial of the pilot frequency sequence;
and if the packet receiving rate is greater than the preset value, selecting the seed number of the random pilot frequency sequence.
4. The method of claim 1, wherein: appending a seed number in the frame control field includes:
generating a frame control word according to a frequency band available for a current communication system;
the seed number is embedded in a reserved field of the variable region of the frame control word.
5. A method for pilot adaptation according to claim 2, characterized in that: receiving and demodulating a frame control word, wherein extracting a seed number in the frame control word comprises:
and carrying out synchronization and channel estimation by receiving the frame lead code, demodulating a frame control word, analyzing the frame control word, and acquiring a seed number of a pilot frequency sequence from a reserved field of a variable region of the frame control word.
6. A method for pilot adaptation according to claim 5, characterized in that: generating the pilot sequence according to the seed number includes:
inputting the seed number into a pilot frequency sequence generator, and generating a pilot frequency sequence by the pilot frequency sequence generator;
the determining the pilot frequency position according to the seed number and extracting the pilot frequency comprises:
inputting the seed number into a pilot frequency sequence generator to obtain a pilot frequency position;
and extracting the pilot frequency according to the pilot frequency position.
7. The method of claim 6, wherein: demodulating the frame payload according to the pilot comprises:
performing channel estimation according to the extracted pilot frequency;
and performing channel equalization according to the result of the channel estimation, and demodulating the frame load.
8. A communication system comprising a transmitter and a receiver, characterized in that:
the transmitter is used for transmitting a frame control word, and a seed number corresponding to a pilot frequency sequence is attached to the frame control word;
the transmitter is also used for generating a pilot frequency sequence according to the seed number of the pilot frequency sequence and inserting pilot frequency information in a fixed position of a frame load symbol according to the pilot frequency sequence;
the transmitter is further configured to transmit a frame payload;
the receiver is used for receiving and demodulating the frame control word and acquiring a seed number from the frame control word;
the receiver is further configured to receive a frame payload;
the receiver is also used for obtaining a pilot frequency position according to the seed number and extracting the pilot frequency;
the receiver is further configured to demodulate the frame payload based on the pilot.
9. A communication device comprising a computer-readable storage medium and a processor, characterized in that: the computer-readable storage medium has stored therein a computer program which, when executed by the processor, implements the pilot adaptation method of any of claims 1-7.
10. A storage medium having a computer program stored therein, characterized in that: the computer program, when executed, implements a pilot adaptation method as claimed in any one of claims 1-7.
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| CN202211474604.0A CN115865132B (en) | 2022-11-22 | 2022-11-22 | Pilot frequency self-adaption method, communication system, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060133381A1 (en) * | 2004-12-22 | 2006-06-22 | Qualcomm Incorporated | Initial pilot frequency selection |
| CN1957539A (en) * | 2004-04-12 | 2007-05-02 | 直视集团公司 | Methods and apparatuses for minimizing co-channel interference |
| US20090060061A1 (en) * | 2007-08-31 | 2009-03-05 | Matsushita Electric Industrial Co, Ltd. | Communication apparatus, communication method, and integrated circuit |
| CN107615834A (en) * | 2015-06-05 | 2018-01-19 | 华为技术有限公司 | The system and method for adaptive pilot distribution |
| CN113412664A (en) * | 2019-02-02 | 2021-09-17 | 中兴通讯股份有限公司 | Authorization-free transmission technology |
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- 2022-11-22 CN CN202211474604.0A patent/CN115865132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1957539A (en) * | 2004-04-12 | 2007-05-02 | 直视集团公司 | Methods and apparatuses for minimizing co-channel interference |
| US20060133381A1 (en) * | 2004-12-22 | 2006-06-22 | Qualcomm Incorporated | Initial pilot frequency selection |
| US20090060061A1 (en) * | 2007-08-31 | 2009-03-05 | Matsushita Electric Industrial Co, Ltd. | Communication apparatus, communication method, and integrated circuit |
| CN107615834A (en) * | 2015-06-05 | 2018-01-19 | 华为技术有限公司 | The system and method for adaptive pilot distribution |
| CN113412664A (en) * | 2019-02-02 | 2021-09-17 | 中兴通讯股份有限公司 | Authorization-free transmission technology |
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