CN112565134B - Carrier phase fixed compensation method for radio frequency signal of receiving end - Google Patents
Carrier phase fixed compensation method for radio frequency signal of receiving end Download PDFInfo
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- CN112565134B CN112565134B CN202011363746.0A CN202011363746A CN112565134B CN 112565134 B CN112565134 B CN 112565134B CN 202011363746 A CN202011363746 A CN 202011363746A CN 112565134 B CN112565134 B CN 112565134B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/01—Equalisers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a carrier phase fixed compensation method of a receiving end radio frequency signal, which comprises the following steps: a receiving end receives a radio frequency signal, wherein the radio frequency signal is a useful signal with a variable carrier frequency; the variable carrier frequency of the radio frequency signal is subjected to normalized frequency conversion to a fixed frequency point with lower frequency by using a frequency normalization processing method to obtain a useful signal with the fixed frequency point; converting the variable carrier phase difference of the radio frequency signal into a fixed phase difference to obtain a useful signal with the fixed phase difference; and determining a phase compensation factor according to the fixed phase deviation, and compensating the signal with the fixed phase deviation by using the phase compensation factor to obtain a useful signal. The invention fixes the carrier generated by the receiving end with different carrier frequencies in phase by a signal processing method of 'normalized frequency', changes the variable phase difference into a fixed phase difference, then carries out compensation and repair on the fixed phase difference, removes the error generated by the fixed phase difference and leaves the needed base signal.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a carrier phase fixed compensation method of a radio frequency signal of a receiving end.
Background
In the demodulation process of the digital receiver, carrier synchronization is an important step, and the carrier demodulation method is that a local oscillator signal with the same phase as the carrier frequency of a sending end is generated at a receiving end, then the local oscillator signal and a received signal are used for multiplication, the carrier signal in the received signal is removed by utilizing the trigonometric function principle, and only a needed useful signal is left. In the above processing procedure, the carrier-wave-removing signal can be completely removed in principle, but in the specific implementation procedure, the carrier-wave signals at the transmitting end and the receiving end are often difficult to be fixed and consistent in phase, which results in poor receiver effect.
Disclosure of Invention
The invention aims to provide a carrier phase fixed compensation method of a radio frequency signal of a receiving end.
In order to achieve the purpose, the technical scheme of the invention is as follows: a carrier phase fixed compensation method of a receiving end radio frequency signal comprises the following steps:
s1 receiving end receives radio frequency signal, which is useful signal Icosw with variable carrier frequencycI is the useful signal, wcIs a variable carrier frequency;
s2 frequency normalizing the variable carrier frequency of RF signal to lower frequency fixed frequency point
Icoswccos(w1+wc)
＝I[cosw1+cos(2wc+w1)]
Wherein, cos (w)1+wc) For locally generating frequencies, w1Is a fixed frequency point;
low-pass filtering is carried out on the normalized signal to obtain a useful signal Icosw with a fixed frequency point1；
S3 search signal Icosw1The first zero-crossing phase point of (1) is changed from negative to positive, and the initial phase delta of the zero-crossing phase point is used1As a fixed phase difference, thereby generating a local carrier signal cos (w)1+δ1)；
S4 demodulating the radio frequency signal by using the local carrier signal, the demodulated signal is
Icosw1cos(w1+δ1)
＝Icosδ1cosw1 2
＝Icosδ1(1+cos2w1)
Low-pass filtering the demodulated signal to obtain a useful signal Icos delta with a fixed phase difference1；
S5 determining a phase compensation factor based on the fixed phase offset
Signal feeding for fixed phase deviation using phase compensation factorAnd performing line compensation to obtain a useful signal.
The invention has the beneficial effects that: the invention fixes the carrier generated by the receiving end with different carrier frequencies in phase by a signal processing method of 'normalized frequency', changes the variable phase difference into a fixed phase difference, then carries out compensation and repair on the fixed phase difference, removes the error generated by the fixed phase difference and leaves the needed base signal. The method can effectively eliminate the influence caused by variable phase deviation and improve the quality of the received signal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
A carrier phase fixed compensation method of a receiving end radio frequency signal comprises the following steps:
s1 receiving end receives radio frequency signal, which is useful signal Icosw with variable carrier frequencycI is the useful signal, wcIs a variable carrier frequency;
s2 frequency normalizing the variable carrier frequency of RF signal to lower frequency fixed frequency point
Icoswccos(w1+wc)
＝I[cosw1+cos(2wc+w1)]
Wherein, cos (w)1+wc) For locally generating frequencies, w1Is a fixed frequency point;
low-pass filtering is carried out on the normalized signal to obtain a useful signal Icosw with a fixed frequency point1；
S3 search signal Icosw1The first zero-crossing phase point of (1) is changed from negative to positive, and the initial phase delta of the zero-crossing phase point is used1As a fixed phase difference, thereby generating a local carrier signal cos (w)1+δ1)；
S4 demodulating the radio frequency signal by using the local carrier signal, the demodulated signal is
Icosw1cos(w1+δ1)
＝Icosδ1cosw1 2
＝Icosδ1(1+cos2w1)
Low-pass filtering the demodulated signal to obtain a useful signal Icos delta with a fixed phase difference1；
S5 determining a phase compensation factor based on the fixed phase offset
And compensating the signal with the fixed phase deviation by using the phase compensation factor to obtain a useful signal.
In the method, in order to make the position of the zero-crossing phase point more accurate, the fixed frequency point value is lower relative to the carrier frequency, so that the number of sampling points in one period is increased as much as possible when the fixed frequency point is sampled.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (1)
1. A carrier phase fixed compensation method of a receiving end radio frequency signal is characterized by comprising the following steps:
s1 receiving end receives radio frequency signal, which is useful signal Icosw with variable carrier frequencycI is the useful signal, wcIs a variable carrier frequency;
s2 frequency normalizing the variable carrier frequency of RF signal to fixed frequency point with lower frequency by frequency normalization method, wherein the normalized signal is Icoswccos(w1+wc)
＝I[cosw1+cos(2wc+w1)]
Wherein, cos (w)1+wc) For locally generating frequencies, w1Is a fixed frequency point;
for normalizedLow-pass filtering the signal to obtain a useful signal Icosw with a fixed frequency point1；
S3 search signal Icosw1The first zero-crossing phase point of (1) is changed from negative to positive, and the initial phase delta of the zero-crossing phase point is used1As a fixed phase difference, thereby generating a local carrier signal cos (w)1+δ1)；
S4 demodulating the radio frequency signal by using the local carrier signal, the demodulated signal is
Icosw1cos(w1+δ1)
＝Icosδ1cosw1 2
＝Icosδ1(1+cos2w1)
Low-pass filtering the demodulated signal to obtain a useful signal I cos delta with a fixed phase difference1；
S5 determining a phase compensation factor based on the fixed phase offset
And compensating the signal with the fixed phase deviation by using the phase compensation factor to obtain a useful signal.
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| CN202011363746.0A CN112565134B (en) | 2020-11-27 | 2020-11-27 | Carrier phase fixed compensation method for radio frequency signal of receiving end |
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| CN112565134A CN112565134A (en) | 2021-03-26 |
| CN112565134B true CN112565134B (en) | 2022-03-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301210A (en) * | 1991-08-30 | 1994-04-05 | France Telecom | Coherent demodulating device with carrier wave recovering digital circuit |
| CN1464708A (en) * | 2002-06-03 | 2003-12-31 | 矽统科技股份有限公司 | Carrier recovery equipment of digital QAM receiver |
| CN1825839A (en) * | 2005-02-23 | 2006-08-30 | 日本电气株式会社 | A demodulator and phase compensation method thereof |
| CN101521641A (en) * | 2008-02-25 | 2009-09-02 | 奇景光电股份有限公司 | Carrier recovery system and carrier recovery method |
| WO2013162444A2 (en) * | 2012-04-24 | 2013-10-31 | He Zhongxia | An arrangement and a method for carrier signal recovery |
| CN105681239A (en) * | 2016-02-29 | 2016-06-15 | 中国电子科技集团公司第五十研究所 | Coherent demodulation implementation method for short-wave single-sideband system |
-
2020
- 2020-11-27 CN CN202011363746.0A patent/CN112565134B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301210A (en) * | 1991-08-30 | 1994-04-05 | France Telecom | Coherent demodulating device with carrier wave recovering digital circuit |
| CN1464708A (en) * | 2002-06-03 | 2003-12-31 | 矽统科技股份有限公司 | Carrier recovery equipment of digital QAM receiver |
| CN1825839A (en) * | 2005-02-23 | 2006-08-30 | 日本电气株式会社 | A demodulator and phase compensation method thereof |
| CN101521641A (en) * | 2008-02-25 | 2009-09-02 | 奇景光电股份有限公司 | Carrier recovery system and carrier recovery method |
| WO2013162444A2 (en) * | 2012-04-24 | 2013-10-31 | He Zhongxia | An arrangement and a method for carrier signal recovery |
| CN105681239A (en) * | 2016-02-29 | 2016-06-15 | 中国电子科技集团公司第五十研究所 | Coherent demodulation implementation method for short-wave single-sideband system |
Non-Patent Citations (1)
| Title |
|---|
| 载波相位恢复算法研究;雷明海等;《成都信息工程学院学报》;20091215(第06期);全文 * |
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