CN107872242B - Multi-tap radio frequency interference eliminator - Google Patents
Multi-tap radio frequency interference eliminator Download PDFInfo
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- CN107872242B CN107872242B CN201610850349.3A CN201610850349A CN107872242B CN 107872242 B CN107872242 B CN 107872242B CN 201610850349 A CN201610850349 A CN 201610850349A CN 107872242 B CN107872242 B CN 107872242B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
Abstract
The invention provides a tap selection method and a realization scheme of a multi-tap radio frequency interference eliminator. Assuming that the multi-tap radio frequency interference canceller has N delay taps, the algorithm loops N times. And the ith (i belongs to [1, N ]) round, the ith tap is in a connected state, and the other N-i taps are in an isolated (or closed) state, so that a self-interference residual value is obtained. And then comparing the residual values corresponding to all the taps to obtain a minimum value, and selecting the tap corresponding to the minimum residual value to finish self-interference elimination, namely keeping the tap in a connected state and closing other taps. The multi-throw switch is used, so that only the ith tap is in a connected state in the ith (i epsilon [1, N ]) wheel, and other N-i taps are completely in a closed state, and leakage cannot be caused due to the limitation of the isolation degree of the electronic switch. Under the control of digital signals, the tap with the minimum delay error of the main path of the channel is flexibly selected to eliminate self-interference.
Description
Technical Field
The invention relates to a multi-tap radio frequency interference eliminator circuit design and a tap selection method, in particular to a method for realizing optimal tap elimination effect, belonging to the field of wireless communication.
Background
Whether the weight optimization problem of the current multi-tap filter belongs to the convex optimization problem is uncertain. For the convex optimization problem, the traditional LMS or RLS algorithm cannot be used without calibration because its control link and observation link span the analog and digital domains; for the non-convex optimization problem, a local optimal point needs to be searched with low precision in a large range, and then iterative calculation is carried out with high precision until convergence is achieved by determining the vicinity of a global optimal point. However, the algorithm complexity is high in the above two cases, and the iteration time is long.
Disclosure of Invention
In the radio frequency interference canceller of the multi-delay tap structure, a plurality of delay lines of fixed delay are required to output reference signals with different delays. The invention provides a tap selection method and a realization scheme of a multi-tap radio frequency interference eliminator.
The method of the invention is designed as follows:
assuming multi-tap radio frequency interferenceThe canceller has N delay taps and the algorithm loops N times. Ith (i e [1, N ]]) And the round leads the ith tap to be in a connected state, and other N-i taps to be in an isolated (or closed) state, thereby obtaining a self-interference residual value Ri。
Then comparing the residual values corresponding to all taps to obtain the minimum value,
selecting the tap corresponding to the minimum residual value to complete self-interference elimination, namely keeping the tap in a connection state, turning off other taps, and RminI.e. the final elimination residue.
The invention provides a design scheme of a radio frequency self-interference elimination circuit,
the development board is provided with a plurality of peripheral interfaces which are connected with a high-performance high-integration-level radio frequency agility transceiver for processing radio frequency signals through an FMC interface to complete the analog-to-digital and digital-to-analog conversion of the radio frequency signals;
the control signal is connected to the control part of the radio frequency interference eliminator in a wired mode and controls the eliminator to work; the radio frequency agility transceiver is connected with the radio frequency self-interference eliminator through an SMA interface by a coaxial cable.
The multi-tap radio frequency eliminator comprises a splitter, a microstrip line, an attenuator, a phase shifter, a radio frequency electronic switch, a combiner and the like, and the multi-tap radio frequency eliminator respectively realizes the functions of signal splitting, delay, amplitude control, phase control, on-off, combination and the like.
The invention provides a circuit corresponding to the tap selection algorithm of the multi-tap radio frequency interference eliminator and an implementation scheme. It is characterized in that the preparation method is characterized in that,
the multi-throw switch is used, so that only the ith tap is in a connected state in the ith (i epsilon [1, N ]) wheel, and other N-i taps are completely in a closed state, and leakage cannot be caused due to the limitation of the isolation degree of the electronic switch. Under the control of digital signals, the tap with the minimum delay error of the main path of the channel is flexibly selected to eliminate self-interference.
The invention has the advantages that: the method of the invention can effectively eliminate the interference of the multi-tap self-interference eliminator, greatly shorten the execution time of the algorithm and simultaneously obtain more ideal elimination effect.
Drawings
Fig. 1 is a design scheme diagram of a radio frequency self-interference elimination circuit.
Detailed Description
In the radio frequency interference canceller of the multi-delay tap structure, a plurality of delay lines of fixed delay are required to output reference signals with different delays. The invention provides a tap selection method and a realization scheme of a multi-tap radio frequency interference eliminator.
The method of the invention is designed as follows:
assuming that the multi-tap radio frequency interference canceller has N delay taps, the algorithm loops N times. Ith (i e [1, N ]]) And the round leads the ith tap to be in a connected state, and other N-i taps to be in an isolated (or closed) state, thereby obtaining a self-interference residual value Ri。
Then comparing the residual values corresponding to all taps to obtain the minimum value,
selecting the tap corresponding to the minimum residual value to complete self-interference elimination, namely keeping the tap in a connection state, turning off other taps, and RminI.e. the final elimination residue.
The invention provides a design scheme of a radio frequency self-interference elimination circuit,
the development board is provided with a plurality of peripheral interfaces which are connected with a high-performance high-integration-level radio frequency agility transceiver for processing radio frequency signals through an FMC interface to complete the analog-to-digital and digital-to-analog conversion of the radio frequency signals;
the control signal is connected to the control part of the radio frequency interference eliminator in a wired mode and controls the eliminator to work; the radio frequency agility transceiver is connected with the radio frequency self-interference eliminator through an SMA interface by a coaxial cable.
The multi-tap radio frequency eliminator comprises a splitter, a microstrip line, an attenuator, a phase shifter, a radio frequency electronic switch, a combiner and the like, and the multi-tap radio frequency eliminator respectively realizes the functions of signal splitting, delay, amplitude control, phase control, on-off, combination and the like.
The invention provides a circuit corresponding to the tap selection algorithm of the multi-tap radio frequency interference eliminator and an implementation scheme. It is characterized in that the preparation method is characterized in that,
the multi-throw switch is used, so that only the ith tap is in a connected state in the ith (i epsilon [1, N ]) wheel, and other N-i taps are completely in a closed state, and leakage cannot be caused due to the limitation of the isolation degree of the electronic switch. Under the control of digital signals, the tap with the minimum delay error of the main path of the channel is flexibly selected to eliminate self-interference.
The invention has the advantages that: the method of the invention can effectively eliminate the interference of the multi-tap self-interference eliminator, greatly shorten the execution time of the algorithm and simultaneously obtain more ideal elimination effect.
Claims (2)
1. A tap selection method of a multi-tap radio frequency interference eliminator is characterized in that the multi-tap radio frequency interference eliminator has N delay taps, and an algorithm is circulated for N times; the method comprises the following steps:
using a multi-throw switch such that at the ith wheel only the ith tap is connected, where i e [1, N ]]And the other N-1 taps are completely closed or isolated to obtain a self-interference residual value RiAnd leakage cannot be caused due to the limitation of the isolation of the electronic switch, and the tap with the minimum delay error of the main path of the channel is flexibly selected under the control of the digital signal to eliminate self-interference, and the method comprises the following steps: comparing the residual values corresponding to all taps to obtain the minimum value,
selecting the tap corresponding to the minimum residual value to complete self-interference elimination, namely keeping the tap in a connection state, turning off other taps, and RminI.e. the final elimination residue, wherein N is an integer greater than 1.
2. The method for selecting taps of a multi-tap radio frequency interference canceller as claimed in claim 1, wherein in the design scheme of the related radio frequency self-interference cancellation circuit, a plurality of peripheral interfaces are arranged on a development board, and the development board is connected with a high-performance high-integration radio frequency agile transceiver for processing radio frequency signals through an FMC interface to complete analog-to-digital conversion and digital-to-analog conversion of the radio frequency signals; the control signal is connected to the control part of the radio frequency interference eliminator in a wired mode and controls the eliminator to work; the radio frequency agility transceiver is connected with the radio frequency self-interference eliminator through an SMA interface by a coaxial cable; the multi-tap radio frequency interference eliminator comprises the following components:
the splitter is used for realizing the splitting function of the signal;
the microstrip line is used for realizing the delay function of signals;
the attenuator is used for realizing the amplitude control function of the signal;
the phase shifter is used for realizing the phase control function of the signal;
the radio frequency electronic switch is used for realizing the on-off function of signals;
and the combiner is used for realizing the signal combining function.
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