KR101732510B1 - Method and apparatus for minimizing channel bandwidth of SSR(super regenerative receiver) - Google Patents
Method and apparatus for minimizing channel bandwidth of SSR(super regenerative receiver) Download PDFInfo
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- KR101732510B1 KR101732510B1 KR1020150157503A KR20150157503A KR101732510B1 KR 101732510 B1 KR101732510 B1 KR 101732510B1 KR 1020150157503 A KR1020150157503 A KR 1020150157503A KR 20150157503 A KR20150157503 A KR 20150157503A KR 101732510 B1 KR101732510 B1 KR 101732510B1
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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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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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
- H04B1/66—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 for reducing bandwidth of signals; for improving efficiency of transmission
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Abstract
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super playback receiver, and more particularly, to a method and apparatus for minimizing the channel bandwidth of a super playback receiver system.
Until now, the wireless communication service has been allocated to the limited frequency resource from the government, and it has been occupied by occupying the proprietary frequency. It is permitted to use limited unlicensed frequency bands for low-power short-range services for some frequencies designated as industrial scientific and medical equipment (ISM) bands in each country. However, the ISM band can be used in almost all areas by many short-range wireless services such as WiFi, Bluetooth, ZigBee, ultra-wideband (UWB), radio frequency identification (RFID) and near field communication (NFC) within the IEEE 802.15 WG And the quality is deteriorated.
Therefore, frequency sharing technology called Cognitive Radio (CR) of IEEE 802.22 emerged as an issue along with system hardware issues such as SDR (Software Defined Radio), Reconfigurable RF, and low power RF.
CR (cognitive radio) technology is a technology that allows the communication system to recognize the surrounding environment and intelligently determine the surrounding environment based on the surrounding environment to operate in an environment optimized for the surrounding environment of each communication system. ). However, as far as technology development progress up to now, SDR is focused on communication transmission device, and CR technology is focused on optimizing RF environment. However, CR technology has problems such as time latency due to the processing of the senior authorization user and increase of the complexity of the receiver.
One aspect of the invention provides a method for minimizing the channel bandwidth of a super regenerative receiver system.
Another aspect of the present invention provides an apparatus for minimizing the channel bandwidth of a super regenerative receiver system.
According to an aspect of the present invention, there is provided a method for minimizing a channel bandwidth of a super replay receiver, the method comprising: selecting one of a plurality of quenching signals having different waveforms from the super replay receiver; Reducing the duty cycle of the quenching signal of the super regenerative receiver and inputting the one quenching signal to the super regenerative oscillator included in the super regenerative receiver.
The plurality of quenching signals may include a square wave, a triangle wave, and a sine wave, and the one quenching signal may be the sine file.
In addition, the reduction of the duty cycle may be performed when the one quenching signal is a square wave.
The method for minimizing a channel bandwidth of a super replay receiver further includes the step of allocating an additional user on a frequency resource based on a narrowband channel obtained by inputting the one quenching signal to the super regenerative oscillator can do.
According to another aspect of the present invention, there is provided a super-reproduction receiver in which a channel bandwidth is minimized, includes a radio frequency (RF) unit for receiving a radio signal and a processor operatively coupled to the RF unit, To select one of the plurality of quenching signals having a waveform, to reduce the duty cycle of the one quenching signal, and to input the one quenching signal to a super regenerative oscillator included in the super regenerative receiver have.
The plurality of quenching signals may include a square wave, a triangle wave, and a sine wave, and the one quenching signal may be the sine file.
In addition, the reduction of the duty cycle may be performed when the one quenching signal is a square wave.
In addition, the processor may be configured to allocate the additional user on the frequency resource based on the ensured narrowband channel by inputting the one quenching signal to the super regenerative oscillator.
A method and apparatus for minimizing a channel bandwidth of a super regenerative receiver system according to an embodiment of the present invention adjusts a waveform / duty cycle of a quenching signal of an SRR, thereby achieving a narrow channel bandwidth with the same data rate and power efficiency It is possible to support communication with a large number of users.
1 is a conceptual diagram illustrating a superreproduction receiver according to an embodiment of the present invention.
2 is a graph showing the operation of the super regenerative oscillator according to the embodiment of the present invention.
FIG. 3 is a graph showing a state in which a super regenerative oscillator according to an embodiment of the present invention reaches a steady state.
4 and 5 are conceptual diagrams showing a waveform of a quenching signal and a Fourier transform of each waveform according to an embodiment of the present invention.
6 is a graph illustrating a channel bandwidth according to a quenching signal waveform according to an embodiment of the present invention.
7 is a graph illustrating a duty cycle of a square wave according to an embodiment of the present invention.
8 and 9 are graphs showing Fourier transforms according to the duty cycle of a square wave according to an embodiment of the present invention.
FIG. 10 is a graph illustrating a change in the channel bandwidth according to the variation of the duty cycle according to the embodiment of the present invention.
11 is a flowchart illustrating a method of adjusting a channel bandwidth of a super playback receiver according to an embodiment of the present invention.
1 is a conceptual diagram illustrating a superreproduction receiver according to an embodiment of the present invention.
Super regenerative receivers (SRRs) were proposed by Armstrong in 1922 and are now being applied in a variety of applications such as home security, remote control, automatic doors, robots, aviation, and ships. The super-playback receiver is operated by the received signal so that a low-power configuration is possible.
1 (A) shows a block diagram of a superreproduction receiver.
Referring to FIG. 1A, a super regenerative receiver includes a super regenerative oscillator (SRO), a low noise amplifier (LNA), an envelope detector for data detection, and a low pass filter low pass filter (LPF), selective network and quenching oscillator, and has high gain.
The radio frequency (RF) channel bandwidth of super regenerative oscillator (SRO), which is the core of super regenerative receivers in existing super regenerative receivers, has wide characteristics. Therefore, the channel selectivity of the super regenerative receiver can be low. The embodiment of the present invention adjusts the waveform / duty cycle of the quenching signal of the SRR so that a super reproduction receiver that supports communication with a plurality of users based on a narrow channel bandwidth with the same data rate and power efficiency .
The low noise amplifier is implemented to amplify the signal received through the antenna and can be implemented to prevent re-emission to the antenna.
The super regenerative receiver constructs the oscillation condition using a positive feedback loop. At this time, when AC power based on a quenching oscillator is applied to Ka (t) through a positive feedback loop, a super regenerative oscillator (SRO) which is the core of a super regenerative receiver can be realized. The super regenerative oscillator can be switched to the operation mode when the power of the signal received through the antenna and the super regenerative oscillator configured through the quenching oscillator is applied to the selective network.
1B is a top block diagram of a channel aware RF sensor system implemented based on a super regenerative receiver.
1B, a signal received through an antenna is amplified through a two-stage low noise amplifier (LNA), and a super-regenerative oscillator, which is a core of a super-regenerative receiver used as a sensor device, SRO). The output of the ultra-refresh oscillator is generated when the signal received through the frequency variable resonator is an effective signal in the corresponding channel. Due to the quenching signal input to the second regenerative oscillator, the received signal forms an envelope. The envelope is input to the envelope detector, comparator, and LPF, which are data detection stages. V Tune , which is a frequency variable control voltage, and a quiescent signal of a comparator, through a baseband processor stage.
The proposed channel sensing RF sensor system should not operate when not receiving the signal. For this purpose, if the quenching signal is applied instead of the V CE voltage of the second regenerative oscillator, the oscillator itself will not operate when the signal is not received. In the embodiment of the present invention, a method of changing through a waveform adjustment of a quenching signal is disclosed.
2 is a graph showing the operation of the super regenerative oscillator according to the embodiment of the present invention.
In FIG. 2, a graph illustrating the output of a radio frequency (RF) signal, a quenching signal, and a super regenerative oscillator is disclosed.
FIG. 2A is a graph showing an RF signal, FIG. 2B is a graph showing a quenched signal, and FIG. 2C is a graph showing an output of a super regenerative oscillator.
Referring to FIG. 2, in the super regenerative oscillator, AC power based on the quenched oscillator may be applied to Ka (t) through a positive feedback loop. Therefore, when there is no signal to be received, the super regenerative oscillator does not oscillate.
In Fig. 2 (b), ζ dc represents the operation level of Ka (t) generated through the forward feedback. When the AC power of the quenching signal exceeds the operation level ζ dc of Ka (t), there is a possibility of oscillation. Since the sufficient power is not applied until the elapsed time for reaching the oscillation steady state of the free oscillator when there is no input signal, the oscillation is stopped and the normal oscillation is not performed. Therefore, the super regenerative oscillator in the absence of an input signal does not oscillate. When there is an input signal, the super regenerative oscillator can oscillate.
FIG. 3 is a graph showing a state in which a super regenerative oscillator according to an embodiment of the present invention reaches a steady state.
In FIG. 3, the super-regenerative oscillator is started to be in a steady state according to the presence or absence of an external signal.
* The super regenerative receiver is implemented by the principle of the injection synchronous oscillator. When the received signal has a frequency within the synchronous bandwidth synchronizing with the free oscillation frequency, the oscillation frequency of the super regenerative oscillator is fixed to the frequency of the received signal Locked.
At this time, the time required for reaching the steady state of the free oscillator may be different from the time taken for reaching the steady state of the injection synchronous oscillator (super regenerative oscillator) generated by the applied signal. If an external signal is applied to the super regenerative oscillator, the time required for reaching the steady state of the super regenerative oscillator may be faster than the time taken for reaching the steady state of the free oscillator.
When the quenching signal of the second graph of FIG. 2 is applied according to the time difference that occurs, the oscillation is stopped periodically, and the super regenerative oscillator can be switched to the operation mode or the relaxation mode. The quenching signal plays an important role in the channel bandwidth because it plays the role of forming the envelope of the output of the super regenerative receiver.
A method for constructing a receiver system by applying a super regenerative circuit system and analyzing elements affecting bandwidth generation during channel formation to form a narrowband channel in a super regenerative receiver is disclosed in the embodiment of the present invention.
Conventional super-regenerative receivers have been applied to receivers that can receive signals with low power and have to support continuous communication with low battery capacity. However, the conventional super replay receiver has a very low data rate used for communication within the communication range, but the channel bandwidth occupied by one channel is so wide that it can not attract a large number of users within a certain band. Hereinafter, in the embodiment of the present invention, it is assumed that a quenching signal of a super regenerative receiver is adjusted or a duty cycle of a quenching signal is adjusted so that communication can be performed based on a narrow channel bandwidth with the same data rate and power efficiency A super reproduction receiver is started.
4 and 5 are conceptual diagrams showing a waveform of a quenching signal and a Fourier transform of each waveform according to an embodiment of the present invention.
In Fig. 4, sine wave and Fourier transform, square wave and Fourier transform, triangle wave and Fourier transform are started.
Referring to FIG. 4, the waveform of the quenching signal affects the envelope of the output of the super regenerative receiver. Therefore, the channel bandwidth varies according to each waveform. Comparing the Fourier transforms according to the signal waveforms in the same period, the sinusoidal waveform consists of two impulses, and the triangular wave and square wave are represented by the sampling function.
Since the Fourier transform of the triangular wave is composed of a square of the sampling function, the power density of the main lobe portion is narrower than that of the square wave. Also, it has a low power density even after passing the first-null part. This result plays an important role in representing the difference of the channel bandwidth when the channel bandwidth is formed by inputting the threshold power V ref .
In Fig. 5, a comparative graph of the spectra of the triangular wave and the square wave is shown.
Referring to FIG. 5, it can be seen that the square wave has a high power density. The square wave has a higher power density than the triangular wave according to the value of the critical power V ref . Since the power density after the first null is higher than that of the triangular wave, different channel bandwidths appear for the same critical power supply.
The waveform of the quenching signal was changed based on the Fourier transform according to the above signal waveform, and the channel bandwidth was measured according to the power of the input signal.
6 is a graph illustrating a channel bandwidth according to a quenching signal waveform according to an embodiment of the present invention.
In Fig. 6, the power of the input signal was measured at intervals of 3dBm from -75 dBm to -60 dBm.
As a result of measurement, when a sinusoidal waveform was used as a quenching signal, a channel bandwidth of 3.45 MHz was confirmed at an input power of -75 dBm.
When triangular waves and square waves are used as the quenching signal, they may show larger channel bandwidths when sine waves are used as quenching signals. A square wave of a triangle wave and a square wave can show a larger channel bandwidth. The size of the channel bandwidth can be confirmed based on the Fourier transform result of the signal waveform as described above.
That is, when a triangular wave or a sine wave is used as a quenching signal in a super regenerative receiver system, the channel bandwidth may be smaller than that of a conventional super regenerative receiver system using a quadrature signal as a square wave. Thus, more channels can be allocated than when square waves are used as quenching signals within the assigned frequency band.
7 is a graph illustrating a duty cycle of a square wave according to an embodiment of the present invention.
A graph of a quadrature signal of a square wave whose duty cycle is varied from 20% to 80% at intervals of 10% using a waveform generator is disclosed.
8 and 9 are graphs showing Fourier transforms according to the duty cycle of a square wave according to an embodiment of the present invention.
Referring to FIG. 8, the result of the Fourier transform according to the duty cycle shows a power density that increases with an increase in the duty cycle.
The first-null can be narrowed as the duty cycle increases.
8A to 8C show Fourier transforms in which the duty cycles of square waves are changed to 25%, 50%, and 75%.
In Fig. 9, graphs for different Fourier transforms are shown with respect to changes in power spectrum and duty cycle as the duty cycle changes.
Referring to FIG. 9, it can be confirmed that the first null becomes narrower as the duty cycle of the square wave increases. That is, when the same threshold power source V ref is applied, a larger channel band can be allocated as the duty cycle is higher.
FIG. 10 is a graph illustrating a change in the channel bandwidth according to the variation of the duty cycle according to the embodiment of the present invention.
In FIG. 10, it can be seen that the channel bandwidth is widened under the same condition when the duty cycle of the square wave increases.
When the power applied to the system is? 75 dBm, and the duty cycle of the square wave is 20%, the channel bandwidth is measured as 7.385 MHz. That is, as the duty cycle of the square wave is smaller, a narrower channel bandwidth can be secured.
That is, according to the embodiment of the present invention, when the duty cycle of a square wave is reduced or an input signal of another waveform (triangular wave, sine wave) is used instead of a square wave, the channel bandwidth can be reduced. Therefore, communication of a large number of users can be supported by using a narrow channel bandwidth with the same data rate and power efficiency.
The existing super-playback receiver and the technology using the same have a level of securing a plurality of channels for only one person within a short distance due to the wide bandwidth of the used channel. However, when a method for minimizing a bandwidth of a super regenerative receiver system according to an embodiment of the present invention is used and the channel bandwidth is reduced to 3-10 MHz, a channel of 2 to 10 times or more is secured, This is possible. Adjusting the duty cycle of the quenching signal and the quadrature signal of the square wave can increase the number of users by up to 10 times.
The super-playback receiver using the proposed technique can be applied as a low-power local communication system for a network (PAN (personal area network), LAN (local area network), etc.) for a large number of users in existing peer-to-peer communication .
11 is a flowchart illustrating a method of adjusting a channel bandwidth of a super playback receiver according to an embodiment of the present invention.
In Fig. 11, a method of adjusting the channel bandwidth according to the selection of the super reproduction receiver is disclosed.
Referring to FIG. 11, the super reproduction receiver determines whether the waveform of the queen signal is a square wave (step S1100).
The super-playback receiver may optionally select the waveform of the quenched signal. For example, the quenching signal can be a sine wave, a square wave, a triangle wave, etc., and a super regenerative receiver can select the waveform of the quenching signal according to the channel load (the number of user devices that need to use that channel).
If the queening signal is square-shaped, the super-playback receiver selects the duty cycle of the quenching signal (step S1110).
The super regenerative receiver can select the duty cycle of the quadrature quadrature signal. The duty cycle of the quenching signal can be selected by the super regenerative receiver according to the channel load. A quenching signal generated based on the waveform of the determined quenching signal and the duty cycle of the quenching signal is input.
The super reproduction receiver inputs a quinquering signal of a sine wave / triangle wave to the super regenerative oscillator (step S1120).
The channel occupied bandwidth can be changed by inputting the quenching signal of the sine wave / triangle wave to the super regenerative oscillator.
The method for minimizing the channel bandwidth of such a super playback receiver system may be implemented in an application or may be implemented in the form of program instructions that can be executed through various computer components and recorded on a computer readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.
Claims (8)
Selecting a quenching signal of one of a square wave quenching signal, a triangle wave quenching signal and a sine wave quenching signal;
Reducing the duty cycle of the one quenching signal if the one quenching signal is the quadrature quenching signal; And
The super playback receiver inputting the one quenching signal to a super playback oscillator included in the super playback receiver,
Wherein the super playback receiver is configured to allocate an additional user on a frequency resource based on a secured narrowband channel by inputting the one queen signal to the super playback oscillator when the one quenching signal is the quadrature wave quenching signal, Lt; / RTI >
Wherein the duty cycle is determined according to the channel load determined by the super regenerative receiver.
Wherein the one quenching signal is determined in consideration of the channel load,
Wherein the super playout receiver is configured to select, as the one quenching signal, the triangle wave quenching signal and the sine wave when supporting a relatively large number of users based on the same data rate and power efficiency. How to minimize receiver bandwidth.
A radio frequency (RF) unit for receiving a radio signal; And
A processor operatively coupled to the RF unit,
Wherein the processor selects one of a quadrature quadrature signal, a quadrature quadrature signal, and a quadrature quadrature signal,
Wherein when the one quenching signal is the square wave quenching signal, the duty cycle of the one quenching signal is decreased,
Wherein the one quenching signal is input to a super regenerative oscillator included in the super regenerative receiver,
Wherein the super playback receiver is configured to allocate an additional user on a frequency resource based on a secured narrowband channel by inputting the one queen signal to the super playback oscillator when the one quenching signal is the quadrature wave quenching signal, Lt; / RTI >
Wherein the duty cycle is determined according to the channel load determined by the super playback receiver.
Wherein the one quenching signal is determined in consideration of the channel load,
Wherein the super playout receiver selects the quadrature quadrature signal and the sine wave as the one quenching signal when it is required to support communication of a relatively large number of users based on the same data rate and power efficiency.
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Non-Patent Citations (1)
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| Won-Sang Yoon, 외. Channel cognitive wireless sensor system based on spectrum sensing technology. IEEE Transactions on Antennas and Propagation. 2014 MARCH* |
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