CN111049604A - Wireless ad hoc network method and device based on auxiliary receiving channel - Google Patents
Wireless ad hoc network method and device based on auxiliary receiving channel Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
The invention discloses a wireless ad hoc network method and a device based on an auxiliary receiving channel, relating to the technical field of wireless communication, wherein the method comprises the steps that when a receiving and sending switch is in a receiving state, a main receiving channel of a dual-channel receiving module receives and outputs at the current receiving working frequency point according to a main channel frame structure; an auxiliary receiving channel of the double-channel receiving module receives and outputs at each frequency point in a working frequency band according to an auxiliary channel frame structure; and the dual-channel baseband module receives the output of the main receiving channel and the output of the auxiliary receiving channel of the dual-channel receiving module, and carries out interference detection and/or subnet discovery according to the output of the auxiliary receiving channel. The invention has the advantages of high interference detection and subnet discovery speed and improves the bandwidth of network service.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wireless ad hoc network method and a wireless ad hoc network device based on an auxiliary receiving channel.
Background
The wireless ad hoc network is a multipoint-to-multipoint distributed network, consists of a plurality of equal nodes, has the characteristics of no central self-organization, multi-hop relay, dynamic routing, strong survivability and the like, and is suitable for occasions which do not depend on the existing basic network facilities and need to temporarily and quickly open an independent and safe wireless communication network, such as anti-terrorism maintenance, movable security, emergency rescue and relief, individual combat, fishing boat/cargo ship formation and control, unmanned area coverage, fleet communication, underground communication, forest fire fighting and the like.
In the prior art, a duplex mode of a wireless ad hoc network adopts Time Division Duplex (TDD), and a Multiple Access mode adopts Time Division Multiple Access (TDMA) or Carrier Sense Multiple Access (CSMA). Each antenna of the receiving end generally corresponds to a receiving channel, and the channel can be used for receiving control information, receiving data information, searching other subnets, scanning interference conditions of each frequency point of a working frequency band, and the like, and each work is allocated with time.
The ad hoc network equipment needs to scan the interference condition of each frequency point in the working frequency band and select the optimal working frequency point or frequency set, thereby ensuring the best communication effect; due to the reasons of node position movement, starting sequence and the like, the wireless ad hoc network may be divided into a plurality of sub-networks at the beginning, but a network is required to be formed at the later stage. If the wireless ad hoc network device is currently in normal communication, it needs to wait for a time slot that the node does not transmit and receive or reserve a special scanning time slot for interference detection and subnet discovery.
In the existing wireless ad hoc network equipment, a duplex mode adopts TDD; the receiving architecture shown in fig. 1 is adopted using Single-Input Single-Output (SISO) or Multiple-Input Multiple-Output (MIMO) technology. The receiving framework mainly comprises an antenna, a broadband filter, a receiving and transmitting switch, a single-channel receiving module, a single-channel baseband module and the like. The ad hoc network equipment adopting the receiving framework needs to perform interference condition scanning and subnet discovery scanning of other frequency points except the working frequency point, and needs to wait for a time slot which is not sent and not received by the node or reserve a special scanning time slot.
Disclosure of Invention
Therefore, the technical problem to be solved by the embodiments of the present invention is to overcome the problem that in the prior art, when the wireless ad hoc network device performs interference detection and subnet discovery, it is necessary to wait for a time slot in which the node is not transmitting and not receiving or reserve a special scanning time slot.
Therefore, the wireless ad hoc network method based on the auxiliary receiving channel in the embodiment of the invention comprises the following steps:
when the receiving and sending switch is in a receiving state, a main receiving channel of the dual-channel receiving module receives and outputs at a current receiving working frequency point according to a main channel frame structure, wherein the main channel frame structure consists of a plurality of control time slots and a plurality of data time slots;
an auxiliary receiving channel of the double-channel receiving module receives and outputs at each frequency point in a working frequency band according to an auxiliary channel frame structure, wherein the auxiliary channel frame structure consists of a plurality of idle time slots and a plurality of scanning time slots;
and the dual-channel baseband module receives the output of the main receiving channel and the output of the auxiliary receiving channel of the dual-channel receiving module, and carries out interference detection and/or subnet discovery according to the output of the auxiliary receiving channel.
Preferably, the step of interference detection comprises:
respectively judging first preset frequency point f in scanning time slot for interference detectioniWhether the frequency point is the current receiving working frequency point;
when the first preset frequency point fiWhen the working frequency point is not currently received, calculating a first preset frequency point f according to the output of an auxiliary receiving channel of the dual-channel receiving moduleiNoise floor/interference situation and update; i is sequentially taken from 1,2, … and N is the first preset total frequency point number in the working frequency band.
Preferably, the step of subnet discovery comprises:
respectively judging second preset frequency points f in scanning time slots for subnet discoveryjWhether the frequency point is the current receiving working frequency point;
when the second preset frequency point fjJudging whether the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point f when the current receiving working frequency point is notjWhether to output a signal;
when the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point fjWhen the signal is output, the signal is subjected to baseband processing; j is sequentially taken from 1,2, …, M, and M is the second preset total frequency point number in the working frequency band.
Preferably, the method further comprises the following steps:
and the dual-channel baseband module performs baseband processing according to the output of the main receiving channel.
Preferably, when the transceiver switch is in the receiving state, before the step of receiving and outputting the main receiving channel of the dual-channel receiving module at the current receiving working frequency point according to the main channel frame structure, the method further includes the following steps:
the broadband filter receives signals input from the antenna, and the signals are output to the dual-channel receiving module through the receiving and transmitting switch after being filtered.
The embodiment of the invention provides a wireless ad hoc network device based on an auxiliary receiving channel, which comprises:
the output end of the antenna is connected with the input end of the broadband filter and used for receiving signals and outputting the signals from the output end;
the output end of the broadband filter is connected with the input end of the receiving and transmitting switch and is used for receiving the signal from the output end of the antenna from the input end and outputting the signal from the output end after filtering processing is carried out on the signal;
the output end of the receiving and transmitting switch is connected with the input end of the dual-channel receiving module and used for receiving the signal from the output end of the broadband filter from the input end when the receiving switch is in a receiving state and outputting the signal from the output end;
the dual-channel receiving module comprises a main receiving channel and an auxiliary receiving channel, wherein the output end of the main receiving channel is connected with the first input end of the dual-channel baseband module, the output end of the auxiliary receiving channel is connected with the second input end of the dual-channel baseband module, the main receiving channel is used for receiving signals from the output end of the receiving and transmitting switch at the current receiving working frequency point according to a main channel frame structure and outputting the signals from the output end of the receiving and transmitting switch from the output end of the main receiving channel, the auxiliary receiving channel is used for receiving signals from the output end of the receiving and transmitting switch at each frequency point in the working frequency band according to an auxiliary channel frame structure and outputting the signals from the output end of the auxiliary receiving channel, the main channel frame structure is composed of a plurality of control time slots and a plurality of data time slots, and the auxiliary channel frame structure is; and
and the dual-channel baseband module is used for receiving the signal output by the main receiving channel from the first input end, receiving the signal output by the auxiliary receiving channel from the second input end, and carrying out interference detection and/or subnet discovery according to the signal output by the auxiliary receiving channel.
Preferably, the dual channel receiving module includes: the device comprises an amplitude limiter, a low noise amplifier, a power divider, a first down-conversion unit and a second down-conversion unit;
the amplitude limiter, the low-noise amplifier and the power divider are sequentially connected, the input end of the amplitude limiter is connected with the output end of the receiving and transmitting switch, the first output end of the power divider is connected with the input end of the first down-conversion unit, the second output end of the power divider is connected with the input end of the second down-conversion unit, the output end of the first down-conversion unit serves as the output end of the main receiving channel, and the output end of the second down-conversion unit serves as the output end of the auxiliary receiving channel.
Preferably, the two-channel baseband module includes: the device comprises a first analog-to-digital converter, a second analog-to-digital converter and a baseband processing unit;
the input end of the first analog-to-digital converter is connected with the output end of the main receiving channel, the input end of the second analog-to-digital converter is connected with the output end of the auxiliary receiving channel, the output end of the first analog-to-digital converter and the output end of the second analog-to-digital converter are respectively connected with the input end of the baseband processing unit, and the baseband processing unit is used for carrying out interference detection and/or subnet discovery according to signals output by the auxiliary receiving channel.
Preferably, the dual-channel baseband module is further configured to perform baseband processing according to an output of the main receiving channel.
The technical scheme of the embodiment of the invention has the following advantages:
the method and the device for wireless ad hoc network based on the auxiliary receiving channel provided by the embodiment of the invention adopt the main receiving channel and the auxiliary receiving channel, because the frame structure of the main channel is provided with the control time slot and the data time slot, the frame structure of the auxiliary channel is provided with the scanning time slot, and when the transceiver switch is in the receiving state, the auxiliary channel receives signals by using the scanning time slot to carry out interference detection and subnet discovery, so that the time slot which is not sent and not received by the node or the special reserved scanning time slot is not needed to be waited for carrying out the interference detection and the subnet discovery, the speed of the interference detection and the subnet discovery in the wireless ad hoc network equipment can be greatly improved, and the network service bandwidth can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram illustrating a specific example of a wireless ad hoc network device in the prior art;
fig. 2 is a flowchart of a specific example of a wireless ad hoc network method based on an auxiliary receiving channel in embodiment 1 of the present invention;
fig. 3 is a flowchart of a specific example of an interference detection method in embodiment 1 of the present invention;
fig. 4 is a flowchart of a specific example of a subnet discovery method in embodiment 1 of the present invention;
fig. 5 is a diagram showing a specific example of a main channel frame structure in embodiment 1 of the present invention;
fig. 6 is a diagram showing a specific example of an auxiliary channel frame structure in embodiment 1 of the present invention;
fig. 7 is a schematic block diagram of a specific example of a wireless ad hoc network device based on an auxiliary receiving channel in embodiment 2 of the present invention;
fig. 8 is a circuit diagram of a specific example of the dual channel receiving module and the dual channel baseband module in embodiment 2 of the present invention.
Reference numerals: the antenna comprises an antenna 1, a broadband filter 2, a transceiving switch 3, a dual-channel receiving module 4, a dual-channel baseband module 5, a limiter 41, a low noise amplifier 42, a power divider 43, a first down-conversion unit 44, a second down-conversion unit 45, a first analog-to-digital converter 51, a second analog-to-digital converter 52 and a baseband processing unit 53.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In describing the present invention, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and/or "comprising," when used in this specification, are intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term "and/or" includes any and all combinations of one or more of the associated listed items. The terms "connected" and "coupled" are to be interpreted broadly, e.g., as meaning either directly connected to one another or indirectly connected to one another through intervening elements, or both; either a wireless or a wired connection. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Additionally, it is understood that the term processing unit refers to a hardware device that includes a memory and a processor. The memory is configured as a memory module and the processor is specifically configured to execute the processes stored in the memory module to thereby execute one or more processes.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a wireless ad hoc network method based on an auxiliary receiving channel, which is described by taking SISO as an example, but is not limited to SISO, and is also applicable to MIMO. As shown in fig. 2, the method comprises the following steps:
s1, when the receiving and sending switch is in the receiving state, the main receiving channel of the dual-channel receiving module receives and outputs at the current receiving working frequency point according to the main channel frame structure, and the main channel frame structure is composed of a plurality of control time slots and a plurality of data time slots; preferably, when the transceiving switch is in a transmitting state, the signal can be directly transmitted through the main receiving channel, and the auxiliary receiving channel does not work;
s2, an auxiliary receiving channel of the double-channel receiving module receives and outputs at each frequency point in a working frequency band according to an auxiliary channel frame structure, wherein the auxiliary channel frame structure is composed of a plurality of idle time slots and a plurality of scanning time slots; the scanning time slot is used for carrying out interference detection and subnet discovery, the scanning time slot for carrying out interference detection and the scanning time slot for carrying out subnet discovery can be distributed according to a working time proportion, and the working time proportion is generally determined by a baseband scheduling strategy; the working frequency band is provided with a plurality of frequency points, and the frequency points can be divided and set differently according to actual requirements;
and S3, the dual-channel baseband module receives the output of the main receiving channel and the output of the auxiliary receiving channel of the dual-channel receiving module, and carries out interference detection and/or subnet discovery according to the output of the auxiliary receiving channel.
According to the wireless ad hoc network method based on the auxiliary receiving channel, the main receiving channel and the auxiliary receiving channel are adopted, the main channel frame structure is provided with the control time slot and the data time slot, the auxiliary channel frame structure is provided with the scanning time slot, and when the receiving and sending switch is in the receiving state, the auxiliary channel receives signals by using the scanning time slot to perform interference detection and subnet discovery, so that the time slot which is not sent but not received by the node or the special reserved scanning time slot is not needed to be waited for performing the interference detection and subnet discovery, the speed of the interference detection and the subnet discovery in the wireless ad hoc network equipment can be greatly increased, and meanwhile, the network service bandwidth can be increased.
Preferably, the step of interference detection in S3 includes:
respectively judging first preset frequency point f in scanning time slot for interference detectioniWhether the frequency point is the current receiving working frequency point;
when the first preset frequency point fiWhen the working frequency point is not currently received, calculating a first preset frequency point f according to the output of an auxiliary receiving channel of the dual-channel receiving moduleiNoise floor/interference situation and update; i is a value sequentially taken from 1,2, … and N, wherein N is a first preset total frequency point number in the working frequency band; when the first preset frequency point fiWhen the current working frequency point is received, directly jumping to the next second preset frequency point for continuous processing. Preferably, i is taken from 1,2, …, and N is taken from 1 to 1 in ascending order. Furthermore, the available frequency set is updated by the whole network by integrating criteria such as noise floor/interference condition, bit error rate and the like, and finally the whole network works under the new frequency or frequency set, so that the communication is more reliable.
As shown in fig. 3, a specific exemplary interference detection workflow is that, after entering an interference detection mode, according to a bandwidth that can be scanned each time (the bandwidth is determined by a band-pass filter in a second down-conversion unit of an auxiliary receiving channel and may be several times of a maximum carrier bandwidth, so as to increase the speed of interference detection), a noise floor/interference condition in the frequency bandwidth is scanned from a first frequency point of a working frequency band, and if a currently receiving working frequency point is within the frequency bandwidth, the currently receiving working frequency point is avoided correspondingly; and periodically scanning the full frequency band, and outputting the noise bottom/interference condition of each frequency point.
Preferably, the step of subnet discovery in S3 includes:
respectively judging second preset frequency points f in scanning time slots for subnet discoveryjWhether the frequency point is the current receiving working frequency point;
when the second preset frequency point fjJudging whether the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point f when the current receiving working frequency point is notjWhether to output a signal; when the second preset frequency point fjWhen the current working frequency point is received, directly jumping to a next second preset frequency point for continuous processing;
when the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point fjWhen the signal is output, the signal is subjected to baseband processing; j is a value sequentially taken from 1,2, …, M is a second preset total frequency point number in the working frequency band; when the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point fjAnd directly jumping to the next second preset frequency point for continuous processing when no output signal exists. Further, if a subnet with higher priority is found and can be combined, the node leaves the subnet firstly, then applies for network access with the subnet with higher priority, the father node responds, the node successfully accesses the network, and finally applies for fine synchronization maintenance and receives network access requests of other nodes.
As shown in fig. 4, a specific exemplary subnet discovery workflow is implemented, after entering a subnet discovery mode, a signal is received according to each frequency point of the device, a scanning period is much longer than a time slot of normal operation of the device, and when receiving signals of other nodes of the local network, the signal is output to a dual-channel baseband module for demodulation and is transmitted to an MAC layer, and the MAC layer performs the next processing. And if the scanning frequency point is the current receiving working frequency point, correspondingly avoiding.
The new frame structure employed in the present embodiment is described below by way of an example of a specific frame structure. Except for the ad hoc network systems based on Wi-Fi, WiMAX and LTE, other wireless ad hoc network systems have no unified standard, and most of the wireless ad hoc network systems are self-defined by various manufacturers. As shown in fig. 5 and 6, the frame structure is divided into a main channel frame structure and an auxiliary channel frame structure.
The network node size is assumed to be 32; the service bandwidth is fully occupied; m frequency points are arranged in the working frequency band; the auxiliary receiving channel can scan O frequency points each time; every 1s is a time element, each time element is divided into 10 time frames, each time frame occupies 100ms and is divided into 125 time slots, and each time slot occupies 800 us; the main channel frame structure consists of 32 control time slots and 93 data time slots, the frequency number of the control time slots is P, the fixed frequency operation is carried out when P is 1, and the frequency hopping operation is carried out when P is more than 1; the auxiliary channel frame structure is composed of k idle time slots and l scanning time slots, and the period of interference detection scanning is 1 s.
Then, when the wireless ad hoc network system in the prior art has only one receiving channel, the time required for the node of the whole network to scan the interference situation of the complete frequency band is as follows: m(s).
In the wireless ad hoc network method of the present embodiment, the maximum transmission time slot of the whole network node occupies 1/Q of the whole time slot, and the time required for scanning the interference situation of the complete frequency band is: 32 XM/((1-1/Q). times.930)(s). The scan speed increases are shown in the following table:
when a subnet is found, 1 node needs to be in a sending state at a certain moment, the other 1 node needs to be in a receiving state, and the current working frequencies of the 2 nodes are the same, so that another subnet can be found.
Then, when the wireless ad hoc network system in the prior art has only one receiving channel, the maximum time required for discovering the neighbor subnet is: 0.1/((1/125) × (2/125))(s).
The maximum time required for discovering the neighbor subnet by the wireless ad hoc network method of the embodiment is as follows: 0.1/((1-1/Q) × (1/125))(s). The subnet discovery speed increase is shown in the following table:
| ratio of transmission time slot | Multiplying power for accelerating |
| 1/Q＝1/2 | 31.25 times of |
| 1/Q＝1/4 | 46.88 times of |
| 1/Q＝1/8 | 54.69 times of |
| 1/Q＝1/32 | 60.55 times of |
If the interference detection and the subnet scanning are completed together, the time slot found by the subnet needs 2 adjacent time slots, so that the control packet can be ensured to be completely received, the maximum number of the special scanning time slots reserved by the wireless ad hoc network system in the prior art needs 64, and the method of the embodiment increases the network service bandwidth to 64/930-6.9% at most.
Preferably, the wireless ad hoc network method based on the auxiliary receiving channel further comprises the following steps:
s4, the dual channel baseband module performs general baseband processing according to the output of the main receiving channel.
Preferably, before S1, the method further comprises the following steps:
and S0, the broadband filter receives the signal input from the antenna, and the signal is output to the dual-channel receiving module through the receiving and transmitting switch after being filtered.
The wireless ad hoc network method based on the auxiliary receiving channel comprises a new receiving channel framework, a new frame structure and a new working process based on the auxiliary receiving channel, and the method does not need to wait for time slots which are not sent but not received by the node or specially reserved scanning time slots to carry out interference detection and subnet discovery, can greatly improve the speed of the interference detection and the subnet discovery in the wireless ad hoc network equipment, and can improve the network service bandwidth at the same time. The wireless ad hoc network system is suitable for a wireless ad hoc network system with wide working frequency band and multiple available frequency points, and particularly suitable for a wireless ad hoc network system working in a frequency hopping mode under the scenes of multiple network nodes and large occupied proportion of service bandwidth.
Example 2
This embodiment provides a wireless ad hoc network device based on supplementary receiving channel, is particularly useful for receiving the restriction of antenna installation position, can not install one more or more only used for wireless ad hoc network equipment and system of receiving antenna more, for example on-vehicle wireless ad hoc network, airborne wireless ad hoc network etc. as shown in fig. 7, the device includes:
an output end of the antenna 1 is connected with an input end of the broadband filter 2 and used for receiving signals and outputting the signals from the output end;
the output end of the broadband filter 2 is connected with the input end of the transceiving switch 3 and is used for receiving the signal from the output end of the antenna 1 from the input end, filtering the signal and then outputting the signal from the output end;
the output end of the transceiving switch 3 is connected with the input end of the dual-channel receiving module 4 and is used for receiving the signal from the output end of the broadband filter 2 from the input end when in a receiving state and outputting the signal from the output end;
the dual-channel receiving module 4 comprises a main receiving channel and an auxiliary receiving channel, wherein the output end of the main receiving channel is connected with the first input end of the dual-channel baseband module 5, the output end of the auxiliary receiving channel is connected with the second input end of the dual-channel baseband module 5, the main receiving channel is used for receiving signals from the output end of the receiving and transmitting switch 3 at the current receiving working frequency point according to a main channel frame structure and outputting the signals from the output end of the receiving and transmitting switch 3 from the output end of the main receiving channel, the auxiliary receiving channel is used for receiving signals from the output end of the receiving and transmitting switch 3 at each frequency point in a working frequency band according to an auxiliary channel frame structure and outputting the signals from the output end of the auxiliary receiving channel, the main channel frame structure consists of a plurality of control time slots and a plurality of data time slots, and the auxiliary; and
and the dual-channel baseband module 5 is configured to receive a signal output from the main receiving channel from the first input terminal, receive a signal output from the auxiliary receiving channel from the second input terminal, and perform interference detection and/or subnet discovery according to the signal output from the auxiliary receiving channel.
According to the wireless ad hoc network device based on the auxiliary receiving channel, a receiving antenna is not required to be additionally arranged, only the auxiliary receiving channel is required to be arranged, interference detection and subnet discovery are not required to be carried out on time slots which are not transmitted and not received by the node or special reserved scanning time slots, the interference detection and subnet discovery speed in the wireless ad hoc network device can be greatly improved through the main channel frame structure and the auxiliary channel frame structure, and meanwhile, the network service bandwidth can be improved.
Preferably, as shown in fig. 8, the dual channel receiving module 4 includes: a limiter 41, a low noise amplifier 42, a power divider 43, a first down-conversion unit 44, and a second down-conversion unit 45;
the amplitude limiter 41, the low noise amplifier 42 and the power divider 43 are sequentially connected, an input end of the amplitude limiter 41 is connected with an output end of the transceiving switch 3, a first output end of the power divider 43 is connected with an input end of the first down-conversion unit 44, a second output end of the power divider 43 is connected with an input end of the second down-conversion unit 45, an output end of the first down-conversion unit 44 serves as an output end of the main receiving channel, and an output end of the second down-conversion unit 45 serves as an output end of the auxiliary receiving channel.
Preferably, the dual-channel baseband module 5 comprises: a first analog-to-digital converter 51, a second analog-to-digital converter 52, and a baseband processing unit 53;
the input end of the first analog-to-digital converter 51 is connected with the output end of the main receiving channel, the input end of the second analog-to-digital converter 52 is connected with the output end of the auxiliary receiving channel, the output end of the first analog-to-digital converter 51 and the output end of the second analog-to-digital converter 52 are respectively connected with the input end of the baseband processing unit 53, and the baseband processing unit 53 is used for performing interference detection and/or subnet discovery according to the signal output by the auxiliary receiving channel, for example, a baseband processing chip (FPGA, DSP, ARM, etc.) may be used.
The working process is as follows: when the receiving switch 3 is in a receiving state, the receiving switch 3 is in the receiving state, the dual-channel receiving module 4 receives the signal and the signal passes through the amplitude limiter 41, and the amplitude limiter has the function of preventing the components of the receiving channel from being burnt by the received signal; then, the received radio frequency signal is amplified by a low noise amplifier 42, and the noise coefficient is low; the radio frequency signals are divided into two paths by the power divider 43, then down-converted to an intermediate frequency or a zero intermediate frequency by the first down-conversion unit 44 and the second down-conversion unit 45, at the same time, the two paths of signals can work at different frequencies, the main receiving channel receives signals sent by other nodes at the current communication frequency point, the auxiliary receiving channel can work at the same frequency point as the main channel and can also work at other frequency points, and interference detection and subnet discovery are performed; two paths of receiving down-conversion hardware can be the same or different, for example, the bandwidth of a band-pass filter of an auxiliary receiving channel can be a little wider, so that the speed of interference detection is improved; in fig. 8, the circuit diagrams of the first down-conversion unit 44 and the second down-conversion unit 45 are only schematic block diagrams, and are not limited to two-time frequency conversion, but also direct down-conversion, the attenuator and the amplifier are designed according to the gain calculation of the receiving link, and the filter designs the indexes such as the working frequency band, the suppression degree, the insertion loss, and the like according to the suppression degree requirement; the two received signals are input to a dual-channel baseband module, and are respectively subjected to analog-to-digital conversion by a first analog-to-digital converter 51 and a second analog-to-digital converter 52, and then are sent to a baseband processing unit 53(FPGA, DSP, ARM, etc.) to perform baseband processing of a physical layer, an MAC layer, a network layer, a cross-layer, and the like.
Preferably, the dual-channel baseband module is further configured to perform baseband processing according to an output of the main receiving channel.
Preferably, the single-channel receiving module and the single-channel baseband module in the prior art as shown in fig. 1 can be replaced by a dual-channel receiving module and a dual-channel baseband module without changing the existing antenna, wideband filter and transceiving switch of the existing device. At present, a receiving down-conversion chip is high in integration level, and the cost increase of the chip with two channels or one channel is small. Meanwhile, the cost of chips used for baseband processing such as a physical layer, an MAC layer and the like, such as an FPGA, a DSP, an ARM and the like, is continuously reduced, so that the cost is saved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A wireless ad hoc network method based on an auxiliary receiving channel is characterized by comprising the following steps:
when the receiving and sending switch is in a receiving state, a main receiving channel of the dual-channel receiving module receives and outputs at a current receiving working frequency point according to a main channel frame structure, wherein the main channel frame structure consists of a plurality of control time slots and a plurality of data time slots;
an auxiliary receiving channel of the double-channel receiving module receives and outputs at each frequency point in a working frequency band according to an auxiliary channel frame structure, wherein the auxiliary channel frame structure consists of a plurality of idle time slots and a plurality of scanning time slots;
and the dual-channel baseband module receives the output of the main receiving channel and the output of the auxiliary receiving channel of the dual-channel receiving module, and carries out interference detection and/or subnet discovery according to the output of the auxiliary receiving channel.
2. The method of claim 1, wherein the step of interference detection comprises:
respectively judging first preset frequency point f in scanning time slot for interference detectioniWhether the frequency point is the current receiving working frequency point;
when the first preset frequency point fiWhen the working frequency point is not currently received, calculating a first preset frequency point f according to the output of an auxiliary receiving channel of the dual-channel receiving moduleiNoise floor/interference situation and update; i is sequentially taken from 1,2, … and N is the first preset total frequency point number in the working frequency band.
3. The method according to claim 1 or 2, wherein the step of subnet discovery comprises:
in useRespectively judging second preset frequency points f in the scanning time slots found by the subnetjWhether the frequency point is the current receiving working frequency point;
when the second preset frequency point fjJudging whether the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point f when the current receiving working frequency point is notjWhether to output a signal;
when the auxiliary receiving channel of the dual-channel receiving module is at the second preset frequency point fjWhen the signal is output, the signal is subjected to baseband processing; j is sequentially taken from 1,2, …, M, and M is the second preset total frequency point number in the working frequency band.
4. A method according to any of claims 1-3, further comprising the step of:
and the dual-channel baseband module performs baseband processing according to the output of the main receiving channel.
5. The method as claimed in any one of claims 1 to 4, wherein before the step of receiving and outputting the main receiving channel of the dual-channel receiving module at the current receiving operating frequency point according to the main channel frame structure when the transceiving switch is in the receiving state, the method further comprises the following steps:
the broadband filter receives signals input from the antenna, and the signals are output to the dual-channel receiving module through the receiving and transmitting switch after being filtered.
6. A wireless ad hoc network device based on an auxiliary receiving channel, comprising:
the output end of the antenna is connected with the input end of the broadband filter and used for receiving signals and outputting the signals from the output end;
the output end of the broadband filter is connected with the input end of the receiving and transmitting switch and is used for receiving the signal from the output end of the antenna from the input end and outputting the signal from the output end after filtering processing is carried out on the signal;
the output end of the receiving and transmitting switch is connected with the input end of the dual-channel receiving module and used for receiving the signal from the output end of the broadband filter from the input end when the receiving switch is in a receiving state and outputting the signal from the output end;
the dual-channel receiving module comprises a main receiving channel and an auxiliary receiving channel, wherein the output end of the main receiving channel is connected with the first input end of the dual-channel baseband module, the output end of the auxiliary receiving channel is connected with the second input end of the dual-channel baseband module, the main receiving channel is used for receiving signals from the output end of the receiving and transmitting switch at the current receiving working frequency point according to a main channel frame structure and outputting the signals from the output end of the receiving and transmitting switch from the output end of the main receiving channel, the auxiliary receiving channel is used for receiving signals from the output end of the receiving and transmitting switch at each frequency point in the working frequency band according to an auxiliary channel frame structure and outputting the signals from the output end of the auxiliary receiving channel, the main channel frame structure is composed of a plurality of control time slots and a plurality of data time slots, and the auxiliary channel frame structure is; and
and the dual-channel baseband module is used for receiving the signal output by the main receiving channel from the first input end, receiving the signal output by the auxiliary receiving channel from the second input end, and carrying out interference detection and/or subnet discovery according to the signal output by the auxiliary receiving channel.
7. The apparatus of claim 6, wherein the dual channel receiving module comprises: the device comprises an amplitude limiter, a low noise amplifier, a power divider, a first down-conversion unit and a second down-conversion unit;
the amplitude limiter, the low-noise amplifier and the power divider are sequentially connected, the input end of the amplitude limiter is connected with the output end of the receiving and transmitting switch, the first output end of the power divider is connected with the input end of the first down-conversion unit, the second output end of the power divider is connected with the input end of the second down-conversion unit, the output end of the first down-conversion unit serves as the output end of the main receiving channel, and the output end of the second down-conversion unit serves as the output end of the auxiliary receiving channel.
8. The apparatus of claim 6 or 7, wherein the dual channel baseband module comprises: the device comprises a first analog-to-digital converter, a second analog-to-digital converter and a baseband processing unit;
the input end of the first analog-to-digital converter is connected with the output end of the main receiving channel, the input end of the second analog-to-digital converter is connected with the output end of the auxiliary receiving channel, the output end of the first analog-to-digital converter and the output end of the second analog-to-digital converter are respectively connected with the input end of the baseband processing unit, and the baseband processing unit is used for carrying out interference detection and/or subnet discovery according to signals output by the auxiliary receiving channel.
9. The apparatus of any of claims 6-8, wherein the dual channel baseband module is further configured to perform baseband processing based on an output of the main receive channel.
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