CN114245412A

CN114245412A - Channel state determination method, device and machine-readable storage medium

Info

Publication number: CN114245412A
Application number: CN202111341042.8A
Authority: CN
Inventors: 陈家国; 王于波; 李德建; 胡毅; 马岩; 冯曦; 张晓燚
Original assignee: State Grid Information and Telecommunication Co Ltd; Beijing Smartchip Microelectronics Technology Co Ltd
Current assignee: State Grid Information and Telecommunication Co Ltd; Beijing Smartchip Microelectronics Technology Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-03-25
Anticipated expiration: 2041-11-12
Also published as: CN114245412B; WO2023082836A1

Abstract

The embodiment of the invention provides a channel state determination method, a channel state determination device and a machine readable storage medium, and belongs to the technical field of communication. The method comprises the following steps: receiving signals at a preset sampling frequency; performing channel state detection with low false alarm probability to obtain at least one low false alarm state response and performing channel state detection with low false alarm probability to obtain at least one low false alarm state response; determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response. The channel state determining method and the device can reliably and accurately distinguish the channel states of signals with different coding types, and reduce repeated and invalid command transmission.

Description

Channel state determination method, device and machine-readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a channel state, and a machine-readable storage medium.

Background

Currently, there is no accurate method for determining the channel state, especially the channel state of Radio Frequency Identification (RFID). For the RFID technology, the reliable channel state is acquired, so that the reader-writer can efficiently read the electronic tags in a group mode.

The existing channel state can be detected in the following ways: after the reader-writer receives the return information of the electronic tag, whether the frame header data of the return data is damaged or not is detected in sequence, whether the data segment of the return information violates the FM0 coding rule or not is detected, and whether the reader-writer receives any information of the electronic tag within the time T1max specified by the protocol or not is detected. The collision probability is detected in three levels, and the accuracy of collision detection can be improved. However, this method does not distinguish whether or not the tag returns data, and is only suitable for collision detection of the FM0 code pattern, and there is a possibility that the collision is erroneously determined due to a sensitivity problem of the electronic tag.

Disclosure of Invention

The invention aims to provide a channel state determination method, a channel state determination device and a machine readable storage medium, wherein the channel state determination method, the channel state determination device and the machine readable storage medium can reliably and accurately distinguish signals with different coding types and reduce repeated and invalid command transmission.

In order to achieve the above object, an embodiment of the present invention provides a channel state determining method, where the method includes: receiving signals at a preset sampling frequency; performing channel state detection with low false alarm probability to obtain at least one low false alarm state response and performing channel state detection with low false alarm probability to obtain at least one low false alarm state response; determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response.

Preferably, the performing channel state detection with low false alarm probability to obtain at least one low false alarm state response includes: and performing at least one of leading sound waveform matching detection and frame header matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the performing leading tone waveform matching detection to obtain the at least one low false alarm state response according to the detection result comprises: obtaining a pilot portion of the received signal; a second state response is obtained when 0 and 1 do not occur periodically for a preset number of cycles in the pilot portion of the received signal.

Preferably, the performing frame header matching detection to obtain the at least one low false alarm condition response according to the detection result includes: a third status response is obtained when a frame header of the received signal is not present.

Preferably, the performing channel state detection with low false alarm probability to obtain at least one low false alarm state response includes: and performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result comprises: calculating the power of the received signal; and when the signal power of the continuous sampling points with the second number is larger than or equal to a second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, and when the signal power of the continuous sampling points with the third number is not smaller than the second detection threshold in the subsequent preset time, obtaining a sixth state response.

Preferably, the performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result comprises: calculating the power of the received signal; and obtaining a seventh state response when the signal powers of the continuous sampling points with the second number are all larger than or equal to the second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, but the signal powers of the continuous sampling points with the third number appear in the following preset time are all smaller than the second detection threshold.

Preferably, the performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result comprises: calculating the power of the received signal; and when the signal power of the second number of continuous sampling points is not greater than or equal to a second detection threshold, obtaining the seventh state response.

Preferably, the performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result comprises: calculating the power of the received signal; and obtaining the seventh state response when the signal power of a second number of continuous sampling points is greater than or equal to the second detection threshold and 0 and 1 periodicity in the preset number of periods does not occur in the leading part of the received signal.

Preferably, determining the channel status according to the at least one low false alarm state response and the at least one low false alarm state response comprises: and in the sound guide part of the received signal, 0 and 1 do not appear periodically in a preset number of periods to obtain a second state response or do not appear in a frame header of the received signal to obtain a third state response, and when the sixth state response is obtained, the channel state is determined to be collision.

Preferably, determining the channel status according to the at least one low false alarm state response and the at least one low false alarm state response comprises: in the leading part of the received signal, 0 and 1 do not appear periodically in a preset number of cycles to obtain a second status response or do not appear in a frame header of the received signal to obtain a third status response, and when the seventh status response is obtained, the channel status is determined to be no response.

The embodiment of the invention also provides a channel state determination method, which comprises the following steps: receiving signals at a preset sampling frequency; performing channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response; determining the channel state based on the at least one low false alarm condition response.

Preferably, the performing channel state detection with low false alarm probability to obtain at least one low false alarm state response includes: and performing at least one of signal detection and collision detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the detecting the signal presence or absence to obtain the at least one low false alarm state response according to the detection result comprises: calculating the power of the received signal; and when the signal power of the continuous sampling points of the first number is not greater than or equal to the first detection threshold, obtaining a first state response.

Preferably, the performing collision detection to obtain the at least one low false alarm state response according to the detection result comprises: detecting collision of the received signals at the time of demodulation; obtaining a fourth state response when the received signal meets a collision condition; a fifth status response is obtained when the received signal does not meet the collision condition.

Preferably, determining the channel status according to the at least one low false alarm status response comprises: and when the first state response is obtained, determining that the channel state is no response.

Preferably, determining the channel status according to the at least one low false alarm status response comprises: when the fourth state response is obtained, determining that the channel state is collision; and when the fifth state response is obtained, determining that the channel state is responded.

An embodiment of the present invention further provides a device for determining a channel state, where the device includes: the device comprises a first receiving unit, a first detecting unit and a first determining unit, wherein the first receiving unit is used for receiving signals at a preset sampling frequency; the first detection unit is used for carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate state response and carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate state response; the first determining unit is configured to determine the channel status according to the at least one low false alarm status response and the at least one low false alarm status response.

Preferably, the first detection unit is configured to: and performing at least one of leading sound waveform matching detection and frame header matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the first detection unit is configured to: performing leading tone waveform matching detection to obtain the at least one low false alarm condition response according to the detection result comprises: obtaining a pilot portion of the received signal; a second state response is obtained when 0 and 1 do not occur periodically for a preset number of cycles in the pilot portion of the received signal.

Preferably, the first detection unit is configured to: performing frame header matching detection to obtain the at least one low false alarm condition response according to the detection result comprises: a third status response is obtained when a frame header of the received signal is not present.

Preferably, the first detection unit is configured to: and performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the first detection unit is configured to: calculating the power of the received signal; and when the signal power of the continuous sampling points with the second number is larger than or equal to a second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, and when the signal power of the continuous sampling points with the third number is not smaller than the second detection threshold in the subsequent preset time, obtaining a sixth state response.

Preferably, the first detection unit is configured to: and calculating the power of the received signal, wherein the signal powers of a second number of continuous sampling points are greater than or equal to the second detection threshold, and in the leading part of the received signal, 0 and 1 appear periodically in the preset number of periods, but the signal powers of a third number of continuous sampling points appear in the following preset time are less than the second detection threshold, so as to obtain a seventh state response.

Preferably, the first detection unit is configured to: calculating the power of the received signal; and when the signal power of the second number of continuous sampling points is not greater than or equal to a second detection threshold, obtaining the seventh state response.

Preferably, the first detection unit is configured to: calculating the power of the received signal; and obtaining the seventh state response when the signal power of a second number of continuous sampling points is greater than or equal to the second detection threshold and 0 and 1 periodicity in the preset number of periods does not occur in the leading part of the received signal.

Preferably, the first determination unit is configured to: and in the sound guide part of the received signal, 0 and 1 do not appear periodically in a preset number of periods to obtain a second state response or do not appear in a frame header of the received signal to obtain a third state response, and when the sixth state response is obtained, the channel state is determined to be collision.

Preferably, the first determination unit is configured to: in the leading part of the received signal, 0 and 1 do not appear periodically in a preset number of cycles to obtain a second status response or do not appear in a frame header of the received signal to obtain a third status response, and when the seventh status response is obtained, the channel status is determined to be no response.

An embodiment of the present invention further provides a device for determining a channel state, where the device includes: the device comprises a second receiving unit, a second detecting unit and a second determining unit, wherein the second receiving unit is used for receiving signals at a preset sampling frequency; the second detection unit is used for carrying out channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response; the second determining unit is configured to determine the channel status according to the at least one low false alarm condition response.

Preferably, the second detection unit is configured to: and performing at least one of signal detection and collision detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the second detection unit is configured to: calculating the power of the received signal; and when the signal power of the continuous sampling points of the first number is not greater than or equal to the first detection threshold, obtaining a first state response.

Preferably, the second detection unit is configured to: detecting collision of the received signals at the time of demodulation; obtaining a fourth state response when the received signal meets a collision condition; a fifth status response is obtained when the received signal does not meet the collision condition.

Preferably, the second determination unit is configured to: and when the first state response is obtained, determining that the channel state is no response.

Preferably, the second determination unit is configured to: when the fourth state response is obtained, determining that the channel state is collision; and when the fifth state response is obtained, determining that the channel state is responded.

An embodiment of the present invention further provides a machine-readable storage medium, on which a program is stored, and when the program is executed, the method for determining a channel state is implemented.

By adopting the technical scheme, the channel state determination method, the device and the machine readable storage medium provided by the invention are combined by the channel state detection method with low false alarm probability and the channel state detection method with low false alarm probability, thereby being beneficial to accurately judging the channel state. And the method can distinguish the channel states reliably and accurately according to signals of different coding types, reduce repeated and invalid command sending, and is favorable for a reader to efficiently count the electronic tags.

Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:

fig. 1 is a flowchart of a channel state determination method according to an embodiment of the present invention;

fig. 2 is a flow chart of channel state detection with low false-negative probability provided by an embodiment of the present invention;

fig. 3 is a flow chart of a low false alarm probability channel state detection provided by an embodiment of the present invention;

fig. 4 is a flowchart of a channel state determination method according to another embodiment of the present invention;

fig. 5 is a schematic diagram of determining a channel state according to an embodiment of the present invention;

fig. 6 is a block diagram of a channel state determination apparatus according to an embodiment of the present invention;

fig. 7 is a block diagram of a channel state determination apparatus according to another embodiment of the present invention.

Description of the reference numerals

1 first receiving unit 2 first detecting unit

3 first determining unit 4 second receiving unit

5 second detection unit 6 second determination unit

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.

Fig. 1 is a flowchart of a channel state determination method according to an embodiment of the present invention. As shown in fig. 1, the method includes:

step S101, receiving a signal at a preset sampling frequency;

for example, for an electronic tag, a tag signal may be received. The receiving tag signal can be a zero intermediate frequency analog signal of the collecting receiving end.

Step S102, carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate response and carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate response;

for example, false alarm refers to that in the detection range, a signal is wrongly judged as no signal due to the existence of noise; false alarm refers to the fact that, since noise is always present objectively, when the amplitude of the noise signal exceeds a detection threshold, the radar (or other detection system) is mistaken for finding a target. The false alarm probability is high, namely the false detection probability is high, but the probability of missing effective signals is low; whereas a low false alarm probability means a high false alarm probability, i.e. a high probability of missing a valid signal, but a low false detection probability. The channel state detection with low false-missing probability refers to: by using the channel state detection mode, the low probability (low false alarm) of missing effective signals in the detection process can be ensured; and the channel state detection with low false alarm probability refers to: by using the channel state detection method, the detection probability of errors in the detection process can be guaranteed to be low (low false alarm). The low false alarm probability or the low false alarm probability can be understood as that only the channel state detection with the low false alarm probability and the channel state detection with the low false alarm probability are relatively speaking, that is, the false alarm probability of the channel state detection with the low false alarm probability is low compared with the channel state detection with the low false alarm probability; the false alarm probability of the channel state detection with low false alarm probability is low compared to the channel state detection with low false alarm probability. The embodiment of the invention does not limit the degree of low false alarm probability or low false alarm probability.

Fig. 2 below provides a channel state detection with low false-alarm-missing probability, that is, signal presence or absence detection, leading tone waveform matching detection, frame header matching detection and collision detection are sequentially performed to obtain the at least one low false-alarm-missing state response according to the detection result. It is to be understood that the detection process and manner are only preferred examples and are not limiting to the invention using only such detection process and manner. Those skilled in the art may perform some reasonable adjustments therein, such as only performing one, two, or three of signal presence detection, leading sound waveform matching detection, frame header matching detection, and collision detection, or using other detection methods with low false alarm rate, which is not described herein again.

As shown in fig. 2, the method includes:

step S201, calculating the power of the received signal;

step S202, judging whether the signal power of a first number of continuous sampling points is greater than or equal to a first detection threshold;

for example, since the method is a channel state detection with a low false-positive probability, i.e. reducing the probability of missing a valid signal, the first detection threshold can be set relatively small so that more signals are received. The first detection threshold may be preset, or may be obtained by the following method: after the command is sent to the label, the RFID reader-writer is switched from the transmitting state to the receiving state, and when the effective label signal does not arrive, noise power statistics is carried out. The result of the noise power statistics is multiplied by a corresponding coefficient to generate a first detection threshold. Signal presence detection may be performed by determining whether signal powers of a first number of consecutive sample points are greater than or equal to a first detection threshold.

Step S203, when the signal power of the continuous sampling points of the first number is not larger than or equal to the first detection threshold, a first state response is obtained;

for example, the signal may be considered to be absent at this point, giving the first state response directly, and not continuing with the subsequent steps.

Step S204, when the signal power of the continuous sampling points with the first number is larger than or equal to the first detection threshold, acquiring the leading part of the received signal;

for example, a signal may be considered present at this point, and the received signal may then be analyzed. The leading part of the signal can be divided into a leading part and a frame head part, and at the moment, the leading part is obtained to analyze the leading part for leading waveform matching detection. The leading sound waveform matching detection is used for further detecting the signal existence state after the signal existence detection operation, so that the signal detection success rate is improved.

Step S205, judging whether 0 and 1 appear periodically in the leading part of the received signal in a preset number of periods;

for example, whether or not the leading sound waveforms match is determined by judging whether or not 0 and 1 appear periodically within a preset number of cycles. The predetermined number of values may be related to a predetermined sampling frequency of the received signal.

Step S206, in the leading sound part of the received signal, when 0 and 1 do not appear periodically in the preset number of periods, a second state response is obtained;

for example, the second status response is given directly at this point and the subsequent steps are not continued.

Step S207, in the leading part of the received signal, when 0 and 1 appear periodically in the preset number of periods, judging whether the frame header of the received signal appears;

for example, at this time, leading sound waveform matching is explained, and then frame header parts are acquired to perform frame header matching detection. Frame header matching may extract valid data for subsequent collision detection. And determining whether the frame headers are matched or not by judging whether the frame headers appear or not.

Step S208, when the frame header of the received signal does not appear, a third state response is obtained;

for example, the third status response is given directly at this time, and the subsequent steps are not continued.

Step S209, when the frame header of the received signal appears, the collision of the received signal is detected during demodulation;

for example, frame header matching is explained at this time, and then collision of the received signal is detected.

Step S210, judging whether the received signal meets the collision condition;

for example, a collision condition may be understood as a duration of time resulting in the occurrence of a 0 or 1, due to the superposition of responses, exceeding the normal duration of time. The normal duration may be set to 1.25 times the time of one symbol period. That is, if the duration of occurrence of 0 or 1 is found to exceed 1.25 times the time of one symbol period, it can be considered that the collision condition is satisfied.

Step S211, when the received signal meets the collision condition, obtaining a fourth state response;

in step S212, when the received signal does not meet the collision condition, a fifth status response is obtained.

For example, at this time, different fourth and fifth state responses are given depending on whether or not the collision condition is satisfied.

Fig. 3 below provides a low false alarm probability channel state detection, i.e., signal validity detection and leading tone waveform matching detection are performed sequentially to obtain the at least one low false alarm state response according to the detection result. It is to be understood that the detection process and manner are only examples, and the present invention is not limited to use only such detection process and manner. Other detection schemes with low false alarm probability may be used or partially justified by those skilled in the art.

As shown in fig. 3, the method includes:

step S301, calculating the power of the received signal;

step S302, judging whether the signal power of a second number of continuous sampling points is greater than or equal to the second detection threshold;

for example, since the method is a channel state detection with a low false alarm probability, i.e. the probability of false detection is reduced, the second detection threshold may be set to be relatively large and larger than the first detection threshold, so that as many valid signals as possible are received. The second detection threshold may be preset, or may be obtained by the following method: after the command is sent to the label, the RFID reader-writer is switched from the transmitting state to the receiving state, and when the effective label signal does not arrive, noise power statistics is carried out. And multiplying the result of the noise power statistics by a corresponding coefficient to generate a second detection threshold. The signal validity detection may be performed by determining whether the signal power of the second number of consecutive sample points is greater than or equal to a second detection threshold.

Step S303, when the signal power of the second number of continuous sampling points is not greater than or equal to a second detection threshold, a seventh state response is obtained;

for example, at this point, it may be proven that the signal is invalid and the seventh status response is given directly without continuing with the subsequent steps.

Step S304, when the signal power of the second number of continuous sampling points is larger than or equal to the second detection threshold, judging whether 0 and 1 occur periodically in the preset number of periods in the leading part of the received signal;

for example, the signal may be validated and the pilot portion may be determined. Wherein the predetermined number of values may also be related to a predetermined sampling frequency of the received signal.

Step S305, obtaining the seventh status response when 0 and 1 do not occur in the preset number of periods in the leading part of the received signal;

for example, the seventh status response is given directly at this time, and the subsequent steps are not continued.

Step S306, in the leading part of the received signal, when 0 and 1 appear periodically in the period of the preset number, judging whether the signal power of a third number of continuous sampling points appears in the following preset time and is smaller than the second detection threshold;

for example, at this time, it is further determined whether the signal powers of a third number of consecutive sampling points caused by collision are all smaller than the second detection threshold within a subsequent preset time. In the embodiment of the present invention, the preset time may be 1.25 times of one symbol period.

Step S307, when the signal power of the continuous sampling points of the third number is not smaller than the second detection threshold within the subsequent preset time, a sixth state response is obtained;

and step S308, obtaining a seventh state response when the signal power of a third number of continuous sampling points is smaller than the second detection threshold in the following preset time.

For example, according to whether the signal power of a third number of continuous sampling points is smaller than the second detection threshold, different sixth state responses and seventh state responses are respectively given.

After obtaining at least one low false alarm state response and at least one low false alarm state response in step S102, continue with step S103:

step S103, determining the channel status according to the at least one low false alarm state response and the at least one low false alarm state response.

For example, when the second state response or the third state response is obtained and the sixth state response is obtained, it is determined that the channel state is a collision; and when the second state response or the third state response is obtained and the seventh state response is obtained, determining that the channel state is non-responsive.

Fig. 4 is a flowchart of a channel state determination method according to another embodiment of the present invention. As shown in fig. 4, the method includes:

step S401, receiving a signal at a preset sampling frequency;

step S402, carrying out channel state detection with low false-missing probability to obtain at least one low false-missing state response;

step S403, determining the channel status according to the at least one low false alarm condition response.

In this embodiment, only channel state detection with low false-miss probability is performed, and the channel state is determined based only on low false-miss status response. Therefore, the detection steps S401-S402 are similar to the above embodiments and are not described again. For step S403, when the first state response is obtained, determining that the channel state is non-response; when the fourth state response is obtained, determining that the channel state is collision; and when the fifth state response is obtained, determining that the channel state is responded.

As shown in fig. 5, it is illustrated how the channel status is determined. The low false alarm state response can be obtained by performing the channel state detection with the low false alarm probability, that is, the low false alarm state response includes the first state response, the second state response, the third state response, the fourth state response and/or the fifth state response, and the low false alarm state response can be obtained by performing the channel state detection with the low false alarm probability, that is, the low false alarm state response includes the sixth state response and/or the seventh state response. After obtaining the at least one low false alarm state response, or the at least one low false alarm state response and the at least one low false alarm state response, the channel state may be determined in combination with the at least one low false alarm state response, or the at least one low false alarm state response and the at least one low false alarm state response.

In addition, after receiving the signal, the channel processing can be carried out before the channel state detection with low false alarm probability and the channel state detection with low false alarm probability are carried out. The channel processing function has two functions, one is signal sampling rate conversion, and the other is filtering low-frequency noise, direct current and high-frequency components. The input complex signal is subjected to phase rotation, so that the signal energy is concentrated on a real part.

Fig. 6 is a block diagram of a channel state determination apparatus according to an embodiment of the present invention. As shown in fig. 6, the apparatus includes: the device comprises a first receiving unit 1, a first detecting unit 2 and a first determining unit 3, wherein the first receiving unit 1 is used for receiving signals at a preset sampling frequency; the first detection unit 2 is configured to perform channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response, and/or perform channel state detection with low false-alarm probability to obtain at least one low false-alarm state response; the first determining unit 3 is configured to determine the channel state according to the at least one low false alarm state response and/or the at least one low false alarm state response.

Preferably, the first detection unit 2 is configured to: and performing at least one of leading sound waveform matching detection and frame header matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the first detection unit 2 is configured to: performing leading tone waveform matching detection to obtain the at least one low false alarm condition response according to the detection result comprises: obtaining a pilot portion of the received signal; a second state response is obtained when 0 and 1 do not occur periodically for a preset number of cycles in the pilot portion of the received signal.

Preferably, the first detection unit 2 is configured to: performing frame header matching detection to obtain the at least one low false alarm condition response according to the detection result comprises: a third status response is obtained when a frame header of the received signal is not present.

Preferably, the first detection unit 2 is configured to: and performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the first detection unit 2 is configured to: calculating the power of the received signal; and when the signal power of the continuous sampling points with the second number is larger than or equal to a second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, and when the signal power of the continuous sampling points with the third number is not smaller than the second detection threshold in the subsequent preset time, obtaining a sixth state response.

Preferably, the first detection unit 2 is configured to: and calculating the power of the received signal, wherein the signal powers of a second number of continuous sampling points are greater than or equal to the second detection threshold, and in the leading part of the received signal, 0 and 1 appear periodically in the preset number of periods, but the signal powers of a third number of continuous sampling points appear in the following preset time are less than the second detection threshold, so as to obtain a seventh state response.

Preferably, the first detection unit 2 is configured to: calculating the power of the received signal; and when the signal power of the second number of continuous sampling points is not greater than or equal to a second detection threshold, obtaining the seventh state response.

Preferably, the first detection unit 2 is configured to: calculating the power of the received signal; and obtaining the seventh state response when the signal power of a second number of continuous sampling points is greater than or equal to the second detection threshold and 0 and 1 periodicity in the preset number of periods does not occur in the leading part of the received signal.

Preferably, the first determination unit 3 is configured to: and in the sound guide part of the received signal, 0 and 1 do not appear periodically in a preset number of periods to obtain a second state response or do not appear in a frame header of the received signal to obtain a third state response, and when the sixth state response is obtained, the channel state is determined to be collision.

Preferably, the first determination unit 3 is configured to: in the leading part of the received signal, 0 and 1 do not appear periodically in a preset number of cycles to obtain a second status response or do not appear in a frame header of the received signal to obtain a third status response, and when the seventh status response is obtained, the channel status is determined to be no response.

An embodiment of the present invention further provides a device for determining a channel state, where the device includes: a second receiving unit 4, a second detecting unit 5 and a second determining unit 6, wherein the second receiving unit 4 is configured to receive a signal at a preset sampling frequency; the second detection unit 5 is configured to perform channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response; the second determining unit 6 is configured to determine the channel status according to the at least one low false alarm state response.

Preferably, the second detection unit 5 is configured to: and performing at least one of signal detection and collision detection to obtain the at least one low false alarm state response according to the detection result.

Preferably, the second detection unit 5 is configured to: calculating the power of the received signal; and when the signal power of the continuous sampling points of the first number is not greater than or equal to the first detection threshold, obtaining a first state response.

Preferably, the second detection unit 5 is configured to: detecting collision of the received signals at the time of demodulation; obtaining a fourth state response when the received signal meets a collision condition; a fifth status response is obtained when the received signal does not meet the collision condition.

Preferably, the second determination unit 6 is configured to: and when the first state response is obtained, determining that the channel state is no response.

Preferably, the second determination unit 6 is configured to: when the fourth state response is obtained, determining that the channel state is collision; and when the fifth state response is obtained, determining that the channel state is responded.

The embodiments of the channel state determining apparatus are similar to the embodiments of the channel state determining method described above, and are not described herein again.

The channel state determining device comprises a processor and a memory, wherein the receiving unit, the detecting unit and the determining unit are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel may set one or more, and the channel state is determined by adjusting kernel parameters.

The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

An embodiment of the present invention provides a storage medium on which a program is stored, the program implementing the channel state determination method when executed by a processor.

The embodiment of the invention provides a processor, which is used for running a program, wherein the channel state determination method is executed when the program runs.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps:

receiving signals at a preset sampling frequency; performing channel state detection with low false alarm probability to obtain at least one low false alarm state response and performing channel state detection with low false alarm probability to obtain at least one low false alarm state response; determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response.

Or when executing the program, the following steps are realized:

receiving signals at a preset sampling frequency; performing channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response; determining the channel state based on the at least one low false alarm condition response.

The device herein may be a server, a PC, a PAD, a mobile phone, etc.

The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device:

Or when executing the program, the following steps are realized:

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for determining a channel state, the method comprising:

receiving signals at a preset sampling frequency;

performing channel state detection with low false alarm probability to obtain at least one low false alarm state response and performing channel state detection with low false alarm probability to obtain at least one low false alarm state response;

determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response.

2. The method of claim 1, wherein the performing the channel state detection with low false-missing probability to obtain at least one low false-missing state response comprises:

and performing at least one of leading sound waveform matching detection and frame header matching detection to obtain the at least one low false alarm state response according to the detection result.

3. The channel state determination method of claim 2, wherein performing pilot waveform match detection to obtain the at least one low false alarm condition response based on the detection result comprises:

obtaining a pilot portion of the received signal;

a second state response is obtained when 0 and 1 do not occur periodically for a preset number of cycles in the pilot portion of the received signal.

4. The method of claim 2, wherein performing frame header matching detection to obtain the at least one low false alarm condition response according to the detection result comprises:

a third status response is obtained when a frame header of the received signal is not present.

5. The method of claim 1, wherein the performing the channel state detection with low false alarm probability to obtain at least one low false alarm state response comprises:

and performing signal validity detection and leading sound waveform matching detection to obtain the at least one low false alarm state response according to the detection result.

6. The method of claim 5, wherein the performing signal validity detection and pilot waveform match detection to obtain the at least one low false alarm state response according to the detection result comprises:

calculating the power of the received signal;

and when the signal power of the continuous sampling points with the second number is larger than or equal to a second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, and when the signal power of the continuous sampling points with the third number is not smaller than the second detection threshold in the subsequent preset time, obtaining a sixth state response.

7. The method of claim 5, wherein the performing signal validity detection and pilot waveform match detection to obtain the at least one low false alarm state response according to the detection result comprises:

calculating the power of the received signal;

and obtaining a seventh state response when the signal powers of the continuous sampling points with the second number are all larger than or equal to the second detection threshold, and in the leading tone part of the received signal, 0 and 1 appear periodically in the preset number of periods, but the signal powers of the continuous sampling points with the third number appear in the following preset time are all smaller than the second detection threshold.

8. The method of claim 5, wherein the performing signal validity detection and pilot waveform match detection to obtain the at least one low false alarm state response according to the detection result comprises:

calculating the power of the received signal;

and when the signal power of the second number of continuous sampling points is not greater than or equal to a second detection threshold, obtaining the seventh state response.

9. The method of claim 5, wherein the performing signal validity detection and pilot waveform match detection to obtain the at least one low false alarm state response according to the detection result comprises:

calculating the power of the received signal;

and obtaining the seventh state response when the signal power of a second number of continuous sampling points is greater than or equal to the second detection threshold and 0 and 1 periodicity in the preset number of periods does not occur in the leading part of the received signal.

10. The method of claim 6, wherein determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response comprises:

and in the sound guide part of the received signal, 0 and 1 do not appear periodically in a preset number of periods to obtain a second state response or do not appear in a frame header of the received signal to obtain a third state response, and when the sixth state response is obtained, the channel state is determined to be collision.

11. The channel state determination method according to any of claims 7-9, wherein determining the channel state based on the at least one low false alarm state response and the at least one low false alarm state response comprises:

in the leading part of the received signal, 0 and 1 do not appear periodically in a preset number of cycles to obtain a second status response or do not appear in a frame header of the received signal to obtain a third status response, and when the seventh status response is obtained, the channel status is determined to be no response.

12. A method for determining a channel state, the method comprising:

receiving signals at a preset sampling frequency;

performing channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response;

determining the channel state based on the at least one low false alarm condition response.

13. The method of claim 12, wherein the performing the channel state detection with low false-negative probability to obtain at least one low false-negative state response comprises:

and performing at least one of signal detection and collision detection to obtain the at least one low false alarm state response according to the detection result.

14. The method of claim 13, wherein performing signal presence detection to obtain the at least one low false alarm condition response according to the detection result comprises:

calculating the power of the received signal;

and when the signal power of the continuous sampling points of the first number is not greater than or equal to the first detection threshold, obtaining a first state response.

15. The channel state determination method of claim 13, wherein performing collision detection to obtain the at least one low false alarm state response according to the detection result comprises:

detecting collision of the received signals at the time of demodulation;

obtaining a fourth state response when the received signal meets a collision condition;

a fifth status response is obtained when the received signal does not meet the collision condition.

16. The channel state determination method of claim 14, wherein determining the channel state based on the at least one low false alarm state response comprises:

and when the first state response is obtained, determining that the channel state is no response.

17. The method of claim 15, wherein determining the channel state based on the at least one low false alarm state response comprises:

when the fourth state response is obtained, determining that the channel state is collision;

and when the fifth state response is obtained, determining that the channel state is responded.

18. A channel state determination apparatus, comprising:

a first receiving unit, a first detecting unit, and a first determining unit, wherein,

the first receiving unit is used for receiving signals at a preset sampling frequency;

the first detection unit is used for carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate state response and carrying out channel state detection with low false alarm rate to obtain at least one low false alarm rate state response;

the first determining unit is configured to determine the channel status according to the at least one low false alarm status response and the at least one low false alarm status response.

19. The apparatus of claim 18, wherein the first detecting unit is configured to:

20. The apparatus of claim 18, wherein the first detecting unit is configured to:

21. A channel state determination apparatus, comprising:

a second receiving unit, a second detecting unit, and a second determining unit, wherein,

the second receiving unit is used for receiving signals at a preset sampling frequency;

the second detection unit is used for carrying out channel state detection with low false-alarm-missing probability to obtain at least one low false-alarm-missing state response;

the second determining unit is configured to determine the channel status according to the at least one low false alarm condition response.

22. The apparatus of claim 21, wherein the second detecting unit is configured to:

23. A machine readable storage medium, having stored thereon a program which, when executed, implements the channel state determination method of any one of claims 1-11 or the channel state determination method of any one of claims 12-17.