CN107070834B - Multichannel demodulation method based on multichannel communication receiving system - Google Patents
Multichannel demodulation method based on multichannel communication receiving system Download PDFInfo
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- CN107070834B CN107070834B CN201710070634.8A CN201710070634A CN107070834B CN 107070834 B CN107070834 B CN 107070834B CN 201710070634 A CN201710070634 A CN 201710070634A CN 107070834 B CN107070834 B CN 107070834B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Signal Processing (AREA)
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- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a multichannel demodulation method based on a multichannel communication receiving system, which comprises the steps of transmitting data by a transmitter and modulating the data by DBPSK and the like. The system performance of the invention is better than the existing system, the interference between the carriers is smaller, the technical problems of higher overhead and time delay of the feedback of the control information are effectively avoided, the system overhead and the time delay of the feedback of the control information are reduced, and the utilization rate of the downlink power of the system is improved.
Description
Technical Field
The invention belongs to the technical field of wireless communication. In particular to a multichannel demodulation method based on a multichannel communication receiving system.
Background
Multi-channel demodulation for a multi-channel communication receiving system is the process of recovering a message from a modulated signal carrying the message. In various information transmission or processing systems, a transmitting end modulates a carrier wave with a message to be transmitted, generating a signal carrying the message. The receiver must recover the transmitted message to be utilized. The frequency spectrum carrying useful information near the carrier wave is moved to the base band, and then the corresponding filter is used for filtering out the base band signal, thus completing the demodulation task. However, in the multi-channel communication receiving system, resource allocation and other control information need to be demodulated first to demodulate the frequency channels belonging to the multi-channel communication receiving system at the corresponding resource positions. However, in the prior art, the interference between carriers is large, and the overhead and the time delay of feeding back the control information in this way are large, so that the utilization rate of the system is reduced.
Disclosure of Invention
The present invention aims to overcome the above disadvantages and provide a multi-channel demodulation method based on a multi-channel communication receiving system.
A multi-channel demodulation method based on a multi-channel communication receiving system comprises the following steps:
the transmitter transmits data and is modulated by DBPSK;
the intermediate frequency sampling rate is increased to 819.2khz through digital up-conversion;
modulated to a 400hz carrier;
extracting the multi-channel down-conversion received data 1/2, and reducing the intermediate frequency sampling rate to 409.6 khz;
sorting the extracted data;
the extracted data is sorted and transformed;
and performing phase compensation on the data after the integral transformation.
Further, the step of DBPSK modulating the data sent by the transmitter specifically includes:
obtaining differential coding through a differential coder;
carrying out level conversion to obtain-1 and +1 code information;
BPSK modulation is carried out to obtain a DBPSK modulation signal
Further, the step of sorting the extracted data specifically includes:
dividing the extracted data into one group of every 2048 data, and extracting each group of data to an associated service table to obtain data;
if the data already exists and is in an updating state, abandoning the current business table and entering the next step;
when the service data is in an updated state, the original extracted data is covered by the new data, and the next step is continued;
when the service data is in an updated state, continuously analyzing the service data to obtain a service table for generating an extracted data record;
extracting according to the content of the data extraction field, acquiring data of a service field corresponding to the metadata, and executing updating operation according to the existence of the extracted data;
and judging the service data state, and if the service data state is a deletion state, deleting the data record corresponding to the service table in the detailed table of the data extraction record.
Further, the step of performing sorting transformation on the extracted data specifically includes:
receiving the extracted data;
copying the received extracted data into 2 parts, and storing the 2 parts on two different addresses;
carrying out data storage;
performing FFT on the stored data;
outputting an FFT conversion result;
outputting a final result according to the FFT output data sequence;
when 1-point and 4-point FFT conversion needs to be completed, the input 1-point data is copied into 4 points and then 4-point FFT conversion is carried out, and then the converted data is extracted to obtain a 1-point FFT conversion result.
Further, the process of performing phase compensation on the data after the rational transformation specifically includes:
the data phase difference after sorting and transformation among different communication nodes is counteracted by adjusting microwaves;
if the antenna carries out data sorting and conversion in the polar direction, the same microwave output is distributed into a plurality of communication channels to carry out phase shifting.
The system performance of the invention is better than the existing system, the interference between the carriers is smaller, the technical problems of higher overhead and time delay of the feedback of the control information are effectively avoided, the system overhead and the time delay of the feedback of the control information are reduced, and the utilization rate of the downlink power of the system is improved.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples:
a multi-channel demodulation method based on a multi-channel communication receiving system comprises the following steps:
the transmitter transmits data and is modulated by DBPSK;
the intermediate frequency sampling rate is increased to 819.2khz through digital up-conversion;
modulated to a 400hz carrier;
extracting the multi-channel down-conversion received data 1/2, and reducing the intermediate frequency sampling rate to 409.6 khz;
sorting the extracted data;
the extracted data is sorted and transformed;
and performing phase compensation on the data after the integral transformation.
Further, the step of DBPSK modulating the data sent by the transmitter specifically includes:
obtaining differential coding through a differential coder;
carrying out level conversion to obtain-1 and +1 code information;
BPSK modulation is carried out to obtain a DBPSK modulation signal
Further, the step of sorting the extracted data specifically includes:
dividing the extracted data into one group of every 2048 data, and extracting each group of data to an associated service table to obtain data;
if the data already exists and is in an updating state, abandoning the current business table and entering the next step;
when the service data is in an updated state, the original extracted data is covered by the new data, and the next step is continued;
when the service data is in an updated state, continuously analyzing the service data to obtain a service table for generating an extracted data record;
extracting according to the content of the data extraction field, acquiring data of a service field corresponding to the metadata, and executing updating operation according to the existence of the extracted data;
and judging the service data state, and if the service data state is a deletion state, deleting the data record corresponding to the service table in the detailed table of the data extraction record.
Further, the step of performing sorting transformation on the extracted data specifically includes:
receiving the extracted data;
copying the received extracted data into 2 parts, and storing the 2 parts on two different addresses;
carrying out data storage;
performing FFT on the stored data;
outputting an FFT conversion result;
outputting a final result according to the FFT output data sequence;
when 1-point and 4-point FFT conversion needs to be completed, the input 1-point data is copied into 4 points and then 4-point FFT conversion is carried out, and then the converted data is extracted to obtain a 1-point FFT conversion result.
The process of performing phase compensation on the data after the integral transformation specifically comprises the following steps:
the data phase difference after sorting and transformation among different communication nodes is counteracted by adjusting microwaves;
if the antenna carries out data sorting and conversion in the polar direction, the same microwave output is distributed into a plurality of communication channels to carry out phase shifting.
Claims (2)
1. A multi-channel demodulation method based on a multi-channel communication receiving system is characterized by comprising the following steps:
the transmitter transmits data and is modulated by DBPSK;
the intermediate frequency sampling rate is increased to 819.2khz through digital up-conversion;
modulated to a 400hz carrier;
extracting the multi-channel down-conversion received data 1/2, and reducing the intermediate frequency sampling rate to 409.6 khz;
sorting the extracted data;
the extracted data is sorted and transformed;
performing phase compensation on the data after the integral transformation;
the step of sorting the extracted data specifically comprises the following steps:
dividing the extracted data into one group of every 2048 data, and extracting each group of data to an associated service table to obtain data;
if the data already exists and is in an updating state, abandoning the current business table and entering the next step;
when the service data is in an updated state, the original extracted data is covered by the new data, and the next step is continued;
when the service data is in an updated state, continuously analyzing the service data to obtain a service table for generating an extracted data record;
extracting according to the content of the data extraction field, acquiring data of a service field corresponding to the metadata, and executing updating operation according to the existence of the extracted data;
judging the state of the service data, and if the state is a deletion state, deleting the data record corresponding to the service table in the detailed table of the data extraction record;
the step of sorting and transforming the extracted data specifically comprises the following steps:
receiving the extracted data;
copying the received extracted data into 2 parts, and storing the 2 parts on two different addresses;
carrying out data storage;
performing FFT on the stored data;
outputting an FFT conversion result;
outputting a final result according to the FFT output data sequence;
when 1-point and 4-point FFT conversion is required to be completed, copying input 1-point data into 4 points, then performing 4-point FFT conversion, and extracting the converted data to obtain a 1-point FFT conversion result;
the process of performing phase compensation on the data after the integral transformation specifically comprises the following steps:
the data phase difference after sorting and transformation among different communication nodes is counteracted by adjusting microwaves;
if the antenna carries out data sorting and conversion in the polar direction, the same microwave output is distributed into a plurality of communication channels to carry out phase shifting.
2. The multi-channel demodulation method based on the multi-channel communication receiving system as claimed in claim 1, wherein the step of DBPSK modulating the data transmitted by the transmitter specifically comprises:
obtaining differential coding through a differential coder;
carrying out level conversion to obtain-1 and +1 code information;
and carrying out BPSK modulation to obtain a DBPSK modulation signal.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101018071A (en) * | 2006-02-08 | 2007-08-15 | 大唐移动通信设备有限公司 | Method for removing the peak power |
| CN101034944A (en) * | 2007-04-03 | 2007-09-12 | 深圳市嵘兴实业发展有限公司 | Multi-task and multi-user radio monitoring receiver and monitoring system |
| US7388932B1 (en) * | 2002-12-30 | 2008-06-17 | Broadlogic Network Technologies, Inc. | Fully parallel multi-channel demodulator |
| CN106209722A (en) * | 2016-06-15 | 2016-12-07 | 电子科技大学 | A kind of multi-path digital down conversion method for baseband signal receiver |
| CN106302302A (en) * | 2015-05-20 | 2017-01-04 | 北京理工大学 | The width phase on-line monitoring of a kind of multi channel signals transmitting terminal and real-time compensation method |
-
2017
- 2017-02-09 CN CN201710070634.8A patent/CN107070834B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7388932B1 (en) * | 2002-12-30 | 2008-06-17 | Broadlogic Network Technologies, Inc. | Fully parallel multi-channel demodulator |
| CN101018071A (en) * | 2006-02-08 | 2007-08-15 | 大唐移动通信设备有限公司 | Method for removing the peak power |
| CN101034944A (en) * | 2007-04-03 | 2007-09-12 | 深圳市嵘兴实业发展有限公司 | Multi-task and multi-user radio monitoring receiver and monitoring system |
| CN106302302A (en) * | 2015-05-20 | 2017-01-04 | 北京理工大学 | The width phase on-line monitoring of a kind of multi channel signals transmitting terminal and real-time compensation method |
| CN106209722A (en) * | 2016-06-15 | 2016-12-07 | 电子科技大学 | A kind of multi-path digital down conversion method for baseband signal receiver |
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