CN110545117B - A wake-up receiver with sampling function - Google Patents
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Abstract
本发明涉及无线发射与接收技术领域，具体为一种具有采样功能的唤醒接收机及接收方法。根据信号的传输方向依次连接有，射频转中频模块，信号恢复和放大模块和数据信号检测模块。射频转中频模块是周期性开启的，降低了射频前端的功耗，同时将天线接收到的射频信号转换成中频采样信号；信号恢复和放大模块滤除中频采样信号中的高频分量并放大，得到连续放大信号；数据信号检测模块中的数据处理子模块将连续放大信号进行解调，得到所传输的数字信息；数据信号检测模块中的占空比信号生成子模块生成占空比信号，控制射频转中频模块的开启频率。本发明克服了传统接收机功耗高和成本高的缺点，实现了一种低功耗和低成本唤醒接收机及接收方法。
The invention relates to the technical field of wireless transmission and reception, in particular to a wake-up receiver with sampling function and a receiving method. According to the transmission direction of the signal, a radio frequency to intermediate frequency module, a signal recovery and amplification module and a data signal detection module are connected in sequence. The RF to IF module is turned on periodically, which reduces the power consumption of the RF front-end, and at the same time converts the RF signal received by the antenna into an IF sampling signal; the signal recovery and amplification module filters out the high-frequency components in the IF sampling signal and amplifies it. The continuous amplified signal is obtained; the data processing sub-module in the data signal detection module demodulates the continuous amplified signal to obtain the transmitted digital information; the duty cycle signal generation sub-module in the data signal detection module generates the duty cycle signal and controls the Turn on frequency of the RF to IF module. The invention overcomes the disadvantages of high power consumption and high cost of the traditional receiver, and realizes a low power consumption and low cost wake-up receiver and a receiving method.
Description
Technical Field
The invention relates to the technical field of wireless transmission and reception, in particular to a wake-up receiver with a sampling function, which is used for communication of the Internet of things, and relates to the technology of realizing a wake-up receiver architecture in a wireless sensor network and reducing the power consumption of a radio frequency front end.
Background
As the field of use of wireless communication becomes more and more widespread, the demand for high-speed, low-cost, and low-power wireless communication becomes stronger and stronger.
To this end, the industry has proposed various wake-up receivers that can continuously monitor the wireless channel and wake-up the primary receiver when actual traffic arrives. Thereby providing significant power savings for the wireless receiver while providing short transmission delays.
Fig. 1, 2 and 3 are circuit diagrams of a conventional wake-up receiver.
Referring to fig. 1, the conventional wake-up receiver includes a thin film bulk acoustic resonator amplifier 100, an envelope detector 110, a Programmable Gain Amplifier (PGA)120, an analog-to-digital converter (ADC)130, and a Band Gap Reference (BGR) device 140. The conventional wake-up receiver illustrated in fig. 1 transfers a radio frequency signal to an envelope detector 110 by performing high impedance conversion using an FBAR amplifier 100 and amplification of the RF signal using a low noise amplifier LNA (not shown) in order to obtain high reception sensitivity. However, the conventional wake-up receiver of fig. 1 consumes much power due to the use of an amplifier, and it is difficult to provide high reception sensitivity at a long distance. Furthermore, the conventional wake-up receiver is difficult to be implemented as a system-on-a-chip (system-on-a-chip) due to the use of a special element, i.e., the FBAR amplifier 100.
Referring to fig. 2, a conventional wake-up receiver is constructed in two stages. The first of the two stages comprises: detector 200, comparator 210 and timer 220, the remaining second stage includes LNA 230, detector 240, and address decoder 250. In the conventional wake-up receiver of fig. 2, when a strong burst signal delivered from a transmitting side is detected, the conventional wake-up receiver sequentially operates the detector 200, the comparator 210, and the timer 220 in the first stage to supply power to the second stage, and switches the second stage to a data signal reception mode in which the signal is received via the LNA 230. Once the first stage switches the second stage to a mode for data reception, the second stage receives the data. Although the wake-up receiver illustrated in fig. 2 consumes a small amount of power because the first stage composed of the detector 200, the comparator 210, and the timer 220 does not use an amplifier, it has low reception sensitivity for a strong burst signal and increases a chip area due to the use of 2 or more detectors. Further, the detector 200 in the first stage is a special element including a multi-stage zero-bias schottky diode, and thus is difficult to integrate by using a Complementary Metal Oxide Semiconductor (CMOS) process.
Referring to fig. 3, another scheme in the prior art is to wake up the receiver using a bit sampling technique, control the power detector through the MCU, sample only a few times in one signal period and determine whether the signal is a wake-up signal, if so, turn on the main receiver to transmit the signal, if not, continue monitoring, and in this way, the power consumption of the receiver can be effectively reduced, so that the power consumption of the wake-up machine is reduced to the μ W level and has a very low sensitivity, but this scheme has a very high requirement on the sampling accuracy of the ADC, and the ADC must complete sampling in a very short time.
The receiver of the above scheme mainly reduces the power consumption of the receiver through two aspects, on one hand, the power consumption is reduced through reducing the sensitivity of the receiver, such as waking up the receiver shown in fig. 1, and the problem of short communication distance and high power consumption exists in the scheme; on the other hand, the power consumption is reduced by reducing the transmission rate of the receiver, such as the wake-up receiver shown in fig. 2 and 3, because a detector and a high-precision ADC are used, the cost is high, and the stability is poor. They all have the problems of high cost and poor stability.
In summary, the prior art has the problems of short communication distance, high power consumption, high cost and poor stability.
Disclosure of Invention
The invention aims to provide a wake-up receiver with a sampling function, which has low cost, low power consumption and high stability, aiming at the defects of the prior art.
The invention relates to a wake-up receiver with a sampling technology, which is characterized in that a radio frequency to intermediate frequency module, a signal recovery and amplification module and a data signal detection module are sequentially connected according to the transmission direction of signals, the radio frequency to intermediate frequency module receives the signals through an antenna, converts high-frequency signals into intermediate-frequency signals, amplifies the signals through the signal recovery and amplification module, demodulates the signals through the data signal detection module and outputs digital information, and the wake-up receiver is periodically started and is used for converting the radio frequency signals received by the antenna into intermediate-frequency sampling signals; the signal recovery and amplification module is also used for filtering the high-frequency component of the intermediate-frequency sampling signal and recovering the high-frequency component into a continuous signal; the data signal detection module comprises a data processing submodule and a duty ratio signal generation submodule, wherein the duty ratio signal is fed back to an enabling end of the radio frequency to intermediate frequency conversion module, and the opening frequency of the radio frequency to intermediate frequency conversion module is controlled by adjusting the period and the pulse width of the duty ratio signal; the data processing sub-module performs ADC sampling and demodulation processing on the continuous signals to obtain transmitted digital information for waking up various devices including a main receiver.
The invention also relates to a wake-up receiving method with a sampling function, which is realized on a wake-up receiver with a sampling function, and is characterized by comprising the following steps:
1. a duty ratio signal generation submodule in the data signal detection module generates a duty ratio signal, the duty ratio signal is fed back to the radio frequency to intermediate frequency conversion module, and the opening frequency of the radio frequency to intermediate frequency conversion module is controlled according to the pulse signal;
2. after the receiver is awakened to receive a radio frequency signal in the environment through an antenna, a radio frequency to intermediate frequency module which is periodically started converts the received radio frequency signal into an intermediate frequency signal and samples the intermediate frequency signal to obtain an intermediate frequency sampling signal, and the intermediate frequency sampling signal is used as an input signal of a signal recovery and amplification module;
3. after the signal recovery and amplification module receives the intermediate frequency sampling signal, the module is used for filtering high-frequency components in the intermediate frequency sampling signal, recovering the intermediate frequency sampling signal into a continuous signal, amplifying the continuous signal and taking the continuous signal as an input signal of the data signal detection module;
4. after the data signal detection module receives the continuous signal, the module demodulates the continuous signal to obtain transmitted digital information, and the digital information is output as a wake-up signal and used for waking up various devices including a main receiver.
Compared with the prior art, the invention has the technical advantages that:
low power consumption: in the method, the radio frequency to intermediate frequency module is periodically opened, for example, the radio frequency to intermediate frequency module is opened only 10 times in 1 second, each time the radio frequency to intermediate frequency module is opened for 1 mu s, and the remaining time is closed. In addition, because the intermediate frequency low pass filter only needs to process the intermediate frequency signal, the power consumption required by the intermediate frequency low pass filter is also very low, and the overall power consumption is also in the μ W level.
The cost is low: compared with the existing receiver, the receiver has lower power consumption, and because the ADC samples continuous intermediate frequency signals, the requirements on the sampling frequency and the clock accuracy of the ADC are not high, and the ADC with low cost can be adopted, so that the cost of the receiver can be effectively reduced.
High stability and strong reliability: in the data detection module, the signals obtained by sampling are stored in groups, then are subjected to inner product with a prefabricated address information sequence, and then whether the signal result obtained by the inner product is a wake-up signal is judged, so that the problems of false wake-up and non-wake-up caused by asynchronous code elements in sampling are solved. Thus possessing high stability.
Easy integration: the whole framework of the invention does not use a special amplifying device, the radio frequency to intermediate frequency module at the front end can directly use the existing device, and the signal recovery and amplifying module uses discrete devices, so that the integration at the later stage is not difficult.
Drawings
FIG. 1 is a block diagram of a conventional wake-up receiver with high power consumption and low sensitivity
FIG. 2 is an architecture of a conventional two-stage wake-up receiver with difficult low sensitivity integration
FIG. 3 is an architecture of a wake-up receiver using a bit sampling technique;
FIG. 4 is a power consumption simulation of a wake-up receiver according to an exemplary embodiment of the present invention;
FIG. 5 is an architecture of the wake-up receiver of the present invention;
fig. 6 is a design of a filter amplifier circuit in the wake-up receiver of the present invention.
FIG. 7 is a flow chart of a wake-up receiver and wake-up method of the present invention
Fig. 8 is a simulation of the waveform of the radio frequency signal of the present invention.
Fig. 9 is a simulation of the output waveform of the present invention after passing through the rf-to-if module.
Fig. 10 is a simulation of the waveform of the present invention after passing through the signal recovery and amplification module.
FIG. 11 is a simulation of the continuous signal of the receiver of the present invention
Fig. 12 is a continuous signal of an actual receiver test of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples
Example 1:
the low-power consumption internet of things can effectively reduce the power consumption of the network, especially the power consumption of the terminal equipment, so that the low-power consumption internet of things can be widely applied to disaster monitoring, can be easily integrated into the existing network, and is convenient for the reconstruction of the network. The existing receiver mainly reduces the power consumption of the receiver through two aspects, on one hand, the power consumption is reduced through reducing the sensitivity of the receiver, but the problems of short communication distance and high power consumption exist; on the other hand, the power consumption is reduced by reducing the transmission rate of the receiver, and because a detector and a high-precision ADC are adopted, the problems of high cost and poor stability exist. Both methods have the problems of high cost and poor stability. In order to solve the above problems, the present invention provides a wake-up receiver with a sampling function through research and development, which is sequentially connected according to a signal transmission direction, and includes a radio frequency to intermediate frequency module, a signal recovery and amplification module, and a data signal detection module, wherein the radio frequency to intermediate frequency module receives a signal through an antenna, converts a high-frequency signal into an intermediate-frequency signal, amplifies the signal by the signal recovery and amplification module, demodulates the signal through the data signal detection module, and outputs digital information, referring to fig. 5, the radio frequency to intermediate frequency module 510 of the present invention is periodically turned on, has a sampling function, and is configured to convert a radio frequency signal received by the antenna into an intermediate-frequency sampling signal. The signal recovery and amplification module 520 of the present invention is further configured to filter the high frequency component of the intermediate frequency sampling signal and recover the intermediate frequency sampling signal into a continuous signal. The data signal detection module 530 is constructed by a DSP device or a single chip microcomputer, and comprises a data processing submodule and a duty ratio signal generation submodule, wherein the duty ratio signal is fed back to an enabling end of the radio frequency to intermediate frequency module 510, and the opening frequency of the radio frequency to intermediate frequency module 510 is controlled by adjusting the period and the pulse width of the duty ratio signal. The data processing sub-module completes the demodulation of the continuous signal, and if the demodulated result is a specified wake-up signal, the data processing sub-module outputs the wake-up signal for waking up various devices including the main receiver. The data processing submodule is equivalent to a singlechip for realizing demodulation and judgment, in the demodulation process, the submodule firstly carries out analog-to-digital conversion on the received continuous amplification signal, and meanwhile, the data processing submodule is provided with a memory space for storage.
In this example, the rf-to-if module is constructed using LT5538, manufactured by AD, and is capable of detecting signals over a wide dynamic range (from-75 dBm to 10dBm), and has an enable pin for controlling the on and off of the rf-to-if module.
In the conventional awakening receiver, the sensitivity is usually reduced to reduce the power consumption, so that the problems of short communication distance and high power consumption exist, the invention develops experiments and exploration aiming at the problems, tries to reduce the power consumption, provides an idea of controlling the intermittent starting of a radio frequency to intermediate frequency module by using a periodic signal, and provides the awakening receiver with the sampling function, low power consumption, long transmission distance and low cost. The radio frequency front end of the radio frequency conversion intermediate frequency module is only used for receiving radio frequency signals and converting high frequency signals into intermediate frequency signals, and is always opened. The invention inputs the frequency sampling signal into the signal recovery and amplification module, and then demodulates the continuous signal through the data processing submodule in the data signal detection module, because the ADC samples the continuous intermediate frequency signal, the requirements on the sampling frequency and the clock accuracy of the ADC are not high, and the invention can be realized by the ADC with low cost. If the demodulated digital information is judged to be a specified wake-up signal, the data signal detection module outputs a high-level wake-up signal for waking up various circuits. The radio frequency to intermediate frequency module is controlled by the duty ratio signal to be opened periodically, and is not always opened, so that compared with the traditional receiver, the radio frequency to intermediate frequency module has lower power consumption. Because the requirements on the sampling frequency of the ADC and the precision of the clock are not high, the cost is lower compared with the existing wake-up receiver. The radio frequency to intermediate frequency module at the front end of the invention can directly use the existing devices, the signal recovery and amplification module uses discrete devices, and the integration difficulty at the later stage is low.
The awakening receiver can be used for disaster detection due to low power consumption and low cost, a large number of awakening receivers with sensors are placed in a designated area for temperature or humidity monitoring at one time, the awakening receiver with low power consumption can continuously work for more than one year, and due to low cost, the awakening receiver does not need to be recovered after electric quantity is exhausted, so that a large amount of cost can be saved. The awakening receiver can identify the address information, so that a network can be conveniently formed, unified control is realized through the base station, and management and use are convenient. Because the awakening receiver does not need a high-precision ADC (analog to digital converter), the low-cost low-precision ADC can be adopted, and a high-cost sample-and-hold device is not needed, the cost is effectively reduced, and a foundation is provided for the mass production and use of the receiver.
Example 2:
the overall structure and specific structure of the wake-up receiver with sampling function are the same as those of embodiment 1, and a low-pass filter is used in the signal recovery and amplification module of the present invention to filter the high-frequency component of the intermediate-frequency sampling signal, recover the high-frequency component into a continuous signal, and amplify the continuous signal through an amplification circuit. In this example, the signal recovery and amplification module is implemented by a second-order filtering and amplifying circuit, which is implemented by an operational amplifier and its peripheral circuits, as shown in fig. 6.
In this example, a second-order filtering and amplifying circuit is formed by using a TLV313 operational amplifier and its peripheral circuits, so as to filter out high-frequency components in the intermediate-frequency sampling signal.
In the circuit, the operational amplifier and the discrete device are used for realizing, so that the filtering parameters are convenient to adjust, and the filtering characteristic still keeps a good filtering effect in a high-frequency band; the design performance is achieved while the manufacture is easy, the integration in the later period is easy, and the cost is low.
Example 3
The overall structure and specific structure of the wake-up receiver with sampling function are the same as those of embodiments 1-2, and the data signal detection module in the invention is formed by a singlechip or a DSP device. No matter the singlechip or the DSP device is used, the singlechip or the DSP device is used as a center and matched with a peripheral circuit to form a data signal detection module with a data processing submodule and a duty ratio signal generation submodule, the DSP device has higher processing speed but higher power consumption than the singlechip, and the singlechip has lower power consumption but lower processing speed than the DSP device. The data processing submodule performs ADC sampling and demodulation processing on the continuous signals to obtain transmitted digital information which is used for awakening various circuits including a main receiver; the duty ratio signal generation submodule generates a duty ratio signal and feeds the duty ratio signal back to an enabling end of the radio frequency to intermediate frequency conversion module, and the opening frequency of the radio frequency to intermediate frequency conversion module is controlled by adjusting the period and the pulse width of the duty ratio signal. The data signal detection module samples continuous signals, stores the latest sampling values in a group of 15 in a memory, and then performs inner product with the address information sequence stored in advance. If the signal is a wake-up signal, a high level is generated for waking up other devices, including the main receiver. By the method, the problems of mistaken awakening and non-awakening of the receiver can be solved, and the stability of the receiver is improved.
The data signal detection module needs to select a low-power chip to ensure that the power consumption is in a mu W level in a low-power mode. The internal clock and interrupt of the single chip microcomputer are used for accurate timing, and the single chip microcomputer is in a low power consumption mode most of the time and is in a normal working state only when the detector and the ADC are enabled for sampling. The singlechip needs to select a low-power consumption chip to ensure that the singlechip has power consumption of a mu W level in an LPM3 mode. The timing is accurately performed through the internal clock and the interrupt of the single chip microcomputer, and the single chip microcomputer is in a normal working state only when the detector and the ADC are enabled to sample under the LPM3 low power consumption mode most of the time. In the embodiment, the data signal detection module uses a singlechip MSP430FR5969 produced by TI company to realize a data processing submodule and a duty ratio signal generation submodule, and has the advantages of low voltage, low power consumption, more pins, high running speed, easy integration and the like.
Example 4
The overall structure and specific structure of the wake-up receiver with sampling function are the same as those of embodiments 1 to 3, an RC loop is provided beside a feedback resistor of a filtering and amplifying circuit in the signal recovery and amplifying module, and referring to fig. 6, a second-order filtering and amplifying circuit is used in the signal recovery and amplifying module to filter high-frequency and amplify the intensity of the filtered signal. When the rf to if module is turned on or off, its output impedance is different, and the difference is very large, and if this factor is not considered, the filtering characteristic of the filter will be changed continuously, which results in abnormal operation, so the filter is designed in consideration of the change of the output impedance of the rf to if module.
According to the signal recovery and amplification module, the RC loop is placed beside the feedback resistor of the filter amplifier to form the filter loop so as to eliminate high-frequency information introduced by periodically starting the radio frequency to intermediate frequency conversion module, and meanwhile, the circuit design ensures that the filter characteristic of the filter cannot be changed due to the starting and the closing of the radio frequency to intermediate frequency conversion module. The circuit is convenient for adjusting the filtering parameters, has low cost, and still keeps good filtering effect in a high-frequency band.
Example 5:
the present invention is also a wake-up receiving method with a sampling function, which is implemented on any one of the above wake-up receivers with a sampling function, and the overall configuration and specific structure of the wake-up receiver with a sampling function and the receiving method are the same as those in embodiments 1 to 4, and a flowchart is shown in fig. 7, including the following steps:
1. designing and building a wake-up receiver with a sampling function: the wake-up receiver with the sampling function is sequentially connected with a radio frequency to intermediate frequency module, a signal recovery and amplification module and a data signal detection module according to the transmission direction of signals, wherein the radio frequency to intermediate frequency module receives the signals through an antenna and converts high-frequency signals into intermediate-frequency signals, the signal recovery and amplification module amplifies the signals, and the data signal detection module demodulates the signals and outputs digital information, wherein the radio frequency to intermediate frequency module is periodically started, has the sampling function and is used for converting the radio frequency signals received by the antenna into intermediate-frequency sampling signals; the signal recovery and amplification module is also used for filtering the high-frequency component of the intermediate-frequency sampling signal and recovering the high-frequency component into a continuous signal; the data signal detection module is constructed by a DSP device or a singlechip, and comprises a data processing submodule and a duty ratio signal generation submodule, wherein the duty ratio signal is fed back to an enabling end of the radio frequency to intermediate frequency module, and the opening frequency of the radio frequency to intermediate frequency module is controlled by adjusting the period and the pulse width of the duty ratio signal; the data processing sub-module performs ADC sampling and demodulation processing on the continuous signals to obtain transmitted digital information, and the transmitted digital information is used for waking up various circuits including a main receiver. The built awakening receiver has a sampling function, and a duty ratio signal generated by the duty ratio signal generation submodule is fed back to the radio frequency to intermediate frequency module and used for controlling the starting frequency of the module.
2. The duty ratio signal controls the starting frequency of the radio frequency to intermediate frequency module: the duty ratio signal generation submodule in the data signal detection module generates a duty ratio signal which is fed back to an enabling end of the radio frequency to intermediate frequency module, the signal has a certain period and pulse width, and the radio frequency to intermediate frequency module is controlled to be turned on and turned off by adjusting the period and the pulse width of the signal. The duty ratio signal in the data signal detection module is fed back to the radio frequency to intermediate frequency module, and the opening frequency of the radio frequency to intermediate frequency module is controlled according to the pulse signal. Therefore, the radio frequency front end of the invention is not always started, and the power consumption is greatly reduced.
3. The radio frequency to intermediate frequency module converts the radio frequency signal to intermediate frequency and samples: after the awakening receiver receives a radio frequency signal in the environment through the antenna, the periodically started radio frequency to intermediate frequency module converts the received radio frequency signal into intermediate frequency and samples the intermediate frequency signal to obtain an intermediate frequency sampling signal, and the intermediate frequency sampling signal is used as an input signal of the signal recovery and amplification module.
The radio frequency to intermediate frequency module is periodically started, has a certain starting frequency, and is equivalent to sampling an intermediate frequency signal. Therefore, after the wake-up receiver receives the radio frequency signal in the environment through the antenna, the radio frequency to intermediate frequency module converts the radio frequency signal into an intermediate frequency sampling signal, and the intermediate frequency sampling signal is used as an input signal of the signal recovery and amplification module.
4. The signal recovery and amplification module filters high-frequency components in the intermediate-frequency sampling signal: after the signal recovery and amplification module receives the intermediate frequency sampling signal, the module is used for filtering high-frequency components in the intermediate frequency sampling signal, recovering the intermediate frequency sampling signal into a continuous signal, amplifying the continuous signal, and using the continuous signal as an input signal of the data signal detection module. The filtering and amplifying circuit filters the high-frequency component in the intermediate-frequency sampling signal, the intermediate-frequency sampling signal is restored into a continuous signal, the continuous signal is amplified, and the continuous signal is used as an input signal of the data signal detection module.
5. The data signal detection module demodulates the continuous amplification signal: the data processing submodule stores a specified wake-up signal in advance as a comparison threshold, the data signal detection module samples and demodulates the continuous signal after receiving the continuous signal from the signal recovery and amplification module to obtain transmitted digital information, and if the transmitted digital information is the same as the address information of the main receiver, the data signal detection module outputs a wake-up signal to wake up the main receiver. The data processing submodule in the data signal detection module stores signals obtained by sampling in a memory by taking 15 signals as a group, and then performs inner product on the signals according to the group and a pre-stored address information sequence to obtain a result after the inner product; comparing and judging the result with a comparison threshold, if the result is greater than the comparison threshold, the signal is an awakening signal, and a high level is generated for awakening other equipment including a main receiver; if the result is less than the comparison threshold, the signal is not a wake-up signal and is discarded. And the data processing submodule receives the new continuous amplification signal again and carries out a new round of detection process. The prescribed wake-up signal pre-stored by the data processing submodule may specifically implement the comparison threshold using address information of the main receiver.
In the data detection module, the signals obtained by sampling are stored in groups, and then are subjected to inner product with a prefabricated address information sequence, and the signals obtained by the inner product are judged, so that the problems of mistaken awakening and non-awakening caused by asynchronous code elements in sampling are solved, and the data detection module has high stability.
In the existing awakening receiving method, the radio frequency front end is always in an on state, and the power consumption is high; the requirements on ADC sampling frequency and clock precision are high, and the cost is high; the use of discrete devices is difficult in later integration; the problem of false awakening or non-awakening caused by symbol asynchronism in sampling exists, and the stability is poor. The invention provides a new awakening receiving method aiming at the problems, wherein a radio frequency to intermediate frequency module, namely an awakening receiver radio frequency front end, is not always started, and is controlled to be started and closed through a feedback duty ratio signal. Because the signal sampled by the ADC of the invention is an intermediate frequency signal, the requirements on the sampling frequency and the clock accuracy are not high, and the cost of the receiver is effectively reduced.
Example 6
The overall structure and the specific structure of the wake-up receiver with the sampling function are the same as those of the embodiments 1 to 5, and the starting frequency is controlled by the duty ratio signal, so that the radio frequency is converted into the intermediate frequency module to finish the sampling of the radio frequency signal. T is a frame length, and if analyzed within a frame length T, the expression of the intermediate frequency sampling signal is:
Ss(t)＝S(t)×Sp(t) (1)
wherein Ss(t) is an intermediate frequency sampling signal, S (t) is a radio frequency to intermediate frequency module which is always in an on state and converts a radio frequency signal received through an antenna into an intermediate frequency signal, SpAnd (t) is a duty ratio signal generated and fed back by the duty ratio generation submodule, and the duty ratio signal is a periodic pulse signal.
Wherein, TpIs the period of the duty cycle signal, τ is the pulse width of the duty cycle signal, n is the frame length T and the period T of the duty cycle signalpThe ratio of (a) to (b). For intermediate frequency sampling signal S of formula (1)s(t) Fourier transform to obtain Fs(w)
Wherein, Fourier transform is carried out on S (t) to obtain S (w), and duty ratio signal S is processedp(t) Fourier transforming to obtain FSp(t)]。
Wherein, for the convenience of representation, note w1＝2π/Tp，
δ (x) is the dirac δ function. After substitution, is simplified to obtain FsThe expression of (w) is:
and obtaining a frequency domain expression of the intermediate frequency sampling signal.
When 1/T ispWhen the frequency is more than or equal to 2/T, after the intermediate frequency sampling signal passes through the signal recovery amplifying module, the obtained continuous signal is Ff(w)。
Equation (6) indicates that a continuous signal having a reduced amplitude compared to the original signal is recovered. The continuous signal passes through the amplifying circuit to complete the recovery of the signal.
Formula (6) is a continuous signal recovered by the signal filter, referring to the expression of formula (5), except for the first term, the three subsequent terms all contain high-frequency components, and after passing through the filter of the invention, the high-frequency components are filtered, so that the formula (6), namely the intermediate-frequency continuous signal after the high-frequency components are filtered, is obtained. The signal is amplified and used as the input of a data signal detection module.
Example 7
The overall structure and the specific structure of the awakening receiver with the sampling function are the same as those of the embodiments 1-6, and the radio frequency to intermediate frequency module is not always started but periodically started, so that the power consumption is greatly reduced. T is the length of one frame, and the power consumption of the receiver within the length of one frame can be calculated through an energy consumption formula. The energy consumption formula is as follows:
wherein p isallIt is the power consumption, p, within one frame length of the inventive wake-up receivereaIs the power consumption, p, when the RF-to-IF module is always on within one frame lengtheiIs the power consumption, p, when the RF-to-IF module is turned off within one frame lengthfIs the power consumption of the signal recovery and amplification module, τ is the pulse width of the duty cycle signal, and n is the ratio of the length of one frame T to the period of the duty cycle signal. The invention discloses a method for reducing power consumption of a receiver, which comprises the steps of periodically starting a radio frequency to intermediate frequency module in a duty ratio signal generation module based on a duty ratio mode to reduce power consumption, calculating the power consumption of the receiver through an energy consumption formula, and adjusting the power consumption of the receiver through software, wherein the value of one frame length T is related to the bit rate of an input signal, generally ranges from 1ms to 1s, and the higher the bit rate is, the larger the value of T is. In the invention, the value of T is 1ms, and the value of tau is selected according to the starting time of the radio frequency to intermediate frequency module and the running time of a single-step instruction of the MCU, and is generally selected to be 2 mus, and is selected to be 2 mus in the invention. n is the ratio of the length T of one frame to the period of the duty ratio signal, the larger the value is, the higher the energy consumption of the receiver is, but the recovery is carried outThe better the effect, generally the value is more than 2, in the invention the value is 10.
The technical effect of the present invention will be explained below by simulation and data thereof.
Example 8:
the overall composition and specific structure of the wake-up receiver with sampling function are the same as those of embodiments 1 to 7, the simulation of the wake-up receiving method with sampling function of the present invention is completed on an MATLAB platform, the input radio frequency signal is shown in fig. 8, and the simulation in fig. 8 is an OOK modulated radio frequency signal received through an antenna. After the signal passes through the rf-to-if module periodically turned on in the present invention, an if sampled signal is obtained, see fig. 9, where fig. 9 is a pulse signal containing a high frequency component, and then the high frequency component in the if sampled signal is filtered out by the signal recovery and amplification module, so as to obtain a continuously amplified signal, see fig. 10, and comparing fig. 8, it can be seen that the signal processed by the signal recovery and amplification module of the present invention has the same code element information as the original rf signal.
In order to test the actual power consumption of the invention, the wake-up receiver prototype with the sampling function of the invention was designed and compared with the simulation results. The radio frequency to intermediate frequency module is an LT5538 chip, and the signal recovery and amplification module uses a second-order filtering and amplification circuit, as shown in fig. 6, the data detection module is completed by an MSP430FR5969 single chip microcomputer. The whole wake-up receiver system with sampling function is simulated by the simulation software TINA-TI provided by the company TI, and the simulation result of the continuously amplified signal is shown in fig. 11. The actual test continuous amplification signal results of the wake-up receiver prototype with sampling of the present invention are shown in fig. 12, which is a plot taken directly from the oscilloscope display during the experiment.
Comparing the simulation result figure 11 with the actual measurement result figure 12, it is shown that the amplitude and the period of the continuous signal passing through the signal recovery and amplification module are the same, which proves that the design idea and the experimental process of the invention are consistent with the simulation result.
The power consumption of the wake-up receiver prototype with sampling function of the present invention was simulated based on the parameters provided by the device manufacturer, and the simulation results are shown in fig. 4. The abscissa of fig. 4 is the bit rate and the ordinate is the power consumption of the inventive receiver. Fig. 4 shows power consumption curves of n-1, n-10, n-50 and n-100, respectively, and in contrast to these curves, the power consumption of the wake-up receiver with sampling function is in the μ W level in the interval of bit rate 1bps to 1000bps under the value of n-10.
The awakening receiver with the sampling function can effectively reduce the power consumption of a network, particularly the power consumption of terminal equipment, greatly prolong the service life of the equipment and supply power by weak energy collected in the environment; meanwhile, the service life is prolonged in disaster monitoring, and the system can be used under various severe conditions without electricity. The power consumption of the receiver is in the muW level, and the power consumption of the receiver can be further reduced by selecting more energy-saving devices.
In short, the invention provides a wake-up receiver with a sampling function and a receiving method, and solves the problems of high power consumption, high cost and poor stability of the traditional receiver. The awakening receiver with the sampling function is sequentially connected with a radio frequency-to-intermediate frequency module, a signal recovery and amplification module and a data signal detection module according to the transmission direction of signals. The radio frequency to intermediate frequency module is periodically started according to the fed back duty ratio signal. The receiving method with the sampling function is realized by the following steps: designing and building a wake-up receiver with a sampling function; the duty ratio signal controls the starting frequency of the radio frequency to intermediate frequency conversion module; the radio frequency to intermediate frequency module converts the radio frequency signal to intermediate frequency and samples the intermediate frequency signal; the signal recovery and amplification module filters high-frequency components in the intermediate-frequency sampling signal; the data signal detection module demodulates the continuous amplified signal and is used for waking up various devices.
The invention controls the starting frequency of the radio frequency to intermediate frequency module by using the duty ratio signal, thereby realizing the sampling of the intermediate frequency signal. The invention reduces the power consumption of the radio frequency front end, and simultaneously converts the radio frequency signal received by the antenna into an intermediate frequency sampling signal; the signal recovery and amplification module filters and amplifies high-frequency components in the intermediate-frequency sampling signal to obtain a continuous amplification signal; a data processing submodule in the data signal detection module demodulates the continuous amplification signal to obtain transmitted digital information; the requirements on the sampling frequency and the clock accuracy are not high, and the cost is low by using the singlechip. And a duty ratio signal generation submodule in the data signal detection module generates a duty ratio signal and controls the starting frequency of the radio frequency to intermediate frequency conversion module. The invention overcomes the defects of high power consumption and high cost of the traditional receiver and realizes the low-power consumption and low-cost awakening receiver and the receiving method. The wireless channel can be continuously monitored, and the main receiver can be awakened when the actual flow arrives, so that the main receiver can be used for receiving the data signals in the wireless network.
Claims (7)
1. A wake-up receiver with a sampling function is sequentially connected according to the transmission direction of signals, and comprises a radio frequency to intermediate frequency module, a signal recovery and amplification module and a data signal detection module, wherein the radio frequency to intermediate frequency module receives the signals through an antenna, converts high-frequency signals into intermediate-frequency signals, amplifies the signals, demodulates the signals through the data signal detection module and outputs digital information; the signal recovery and amplification module is also used for filtering the high-frequency component of the intermediate-frequency sampling signal and recovering the high-frequency component into a continuous signal; the data signal detection module comprises a data processing submodule and a duty ratio signal generation submodule, wherein the duty ratio signal is fed back to an enabling end of the radio frequency to intermediate frequency conversion module, and the opening frequency of the radio frequency to intermediate frequency conversion module is controlled by adjusting the period and the pulse width of the duty ratio signal; the data processing sub-module performs ADC sampling and demodulation processing on the continuous signals to obtain transmitted digital information for waking up various devices including a main receiver.
2. The wake-up receiver with sampling function as claimed in claim 1, wherein the signal recovery and amplification module uses a low pass filter to filter out high frequency components of the intermediate frequency sampling signal and recover the intermediate frequency sampling signal into a continuous signal, and the continuous signal is amplified by the amplification circuit.
3. The wake-up receiver with the sampling function according to claim 1, wherein the duty cycle signal generation submodule in the data signal detection module is formed by a single chip microcomputer or a DSP device.
4. The wake-up receiver with sampling function as claimed in claim 1, wherein an RC loop is disposed beside a feedback resistor of the filtering and amplifying circuit in the signal recovering and amplifying module.
5. A wake-up receiving method with sampling function, implemented on a wake-up receiver with sampling function according to any of claims 1 to 4, characterized in that it comprises the following steps:
1) designing and building a wake-up receiver with a sampling function, wherein the wake-up receiver with the sampling function is sequentially connected according to the transmission direction of signals, and comprises a radio frequency-to-intermediate frequency module, a signal recovery and amplification module and a data signal detection module, wherein the radio frequency-to-intermediate frequency module receives signals through an antenna, converts high-frequency signals into intermediate-frequency signals, amplifies the signals through the signal recovery and amplification module, demodulates the signals through the data signal detection module and outputs digital information, and the radio frequency-to-intermediate frequency module is periodically started, has the sampling function and is used for converting the intermediate-frequency signals into intermediate-frequency sampling signals; the signal recovery and amplification module is also used for filtering the high-frequency component of the intermediate-frequency sampling signal and recovering the high-frequency component into a continuous signal; the data signal detection module is constructed by a DSP device or a singlechip, and comprises a data processing submodule and a duty ratio signal generation submodule, wherein the duty ratio signal is fed back to an enabling end of the radio frequency to intermediate frequency module, and the opening frequency of the radio frequency to intermediate frequency module is controlled by adjusting the period and the pulse width of the duty ratio signal; the data processing submodule carries out ADC sampling and demodulation processing on the continuous signals to obtain transmitted digital information which is used for awakening various circuits including a main receiver;
2) the duty ratio signal generation submodule in the data signal detection module generates a duty ratio signal, and feeds the duty ratio signal back to the radio frequency to intermediate frequency module, and the opening frequency of the radio frequency to intermediate frequency module is controlled according to the duty ratio signal;
3) after the awakening receiver receives a radio frequency signal in the environment through an antenna, a radio frequency to intermediate frequency module which is periodically started converts the received radio frequency signal into intermediate frequency and samples the intermediate frequency signal to obtain an intermediate frequency sampling signal, and the intermediate frequency sampling signal is used as an input signal of a signal recovery and amplification module;
4) after the signal recovery and amplification module receives the intermediate frequency sampling signal, the module is used for filtering high-frequency components in the intermediate frequency sampling signal, recovering the intermediate frequency sampling signal into a continuous signal, amplifying the continuous signal and taking the continuous signal as an input signal of the data signal detection module;
5) after the data signal detection module receives the continuous signal, the module demodulates the continuous signal to obtain transmitted digital information, and the digital information is output as a wake-up signal.
6. The wake-up receiving method with sampling function according to claim 5, wherein the turn-on frequency in step 1 is controlled by the rf signal and the duty ratio signal, so that the rf-to-if module completes sampling of the rf signal, assuming an observation time T, and analyzing within the observation time T, the expression of the if sampling signal is:
Ss(t)＝S(t)×Sp(t)
wherein Ss(T) is an intermediate frequency sampling signal, S (T) is a radio frequency to intermediate frequency module which is in a state of being always on within an observation time T and converts a radio frequency signal received through an antenna into an intermediate frequency signal, SpAnd (t) is a duty ratio generation submodule duty ratio signal which is a periodic pulse signal.
7. The wake-up receiving method with the sampling function according to claim 6, wherein the rf-to-if module is not always turned on but is turned on periodically, so that energy consumption can be greatly reduced; setting an observation time T, and calculating the power consumption of the receiver in the time T through an energy consumption formula, wherein the energy consumption formula is as follows:
wherein, PallIs the power consumption of the receiver, PeaIs the power consumption, P, when the RF-to-IF module is turned oneiIs the power consumption, P, when the RF-to-IF module is turned offfIs the power consumption of the signal recovery and amplification module, τ is the pulse width of the duty cycle signal, and n is the ratio of the observation time T to the period of the duty cycle signal.
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