How radiomodule communication channels

 

(57) Abstract:

Usage: the invention relates to radio engineering, in particular to techniques for creating artificial interference and, in particular, can be used for suppression of radio transmission using packet technology, but also as a way of imitation of interfering signal during adjustment and the estimated bandwidth of radio transmission. The aim of the invention is to develop a method of suppressing that enhance the effectiveness of the interference is achieved by forming intentional interference, taking into account the particular link-layer protocols. The method includes a process of forming a signal to set the operation mode of the control device of the transmission and the structure of the modulating voltage, which responds to the intensity of the transmission channel. This leads to less time radiation interference on one frequency and allows the use of the released resource to suppress other sources of radiation. 1 C.p. f-crystals, 6 ill.

The invention relates to radio engineering, in particular to techniques for creating artificial interference and, in particular, can be used to suppress the radio peredacha and the estimated bandwidth of radio transmission.

Known methods of forming the interference (see wakin S. A., Shustov L. N. The basics of jamming and electronic reconnaissance. - M.; Soviet radio, 1968, S. 443; Palii, A., And Electronic warfare. - M.: Military publishing house, 1989, S. 350), which includes the reception signals of the radiation sources, the determination of the parameters of these radiations (carrier frequency, modulation types and spectrum width), the formation of the structure of the modulating voltage, the modulation signals of pathogens obtained by modulating voltage, amplifying and broadcasting interfering signal.

However, the known methods provide radiation of interference without considering the peculiarities of protocols data link layer control information channel and access to the transmission medium) used in modern radio packet information, which leads to significant time radio noise emissions for achieving a given effect disruption of the packet radio network.

The closest in technical essence to the invention is a method of forming interference described in the book: paly A. I. Electronic warfare. - 2nd ed., Rev. and supplementary): Military publishing house, 1989, S. 34, Fig. 2.11. the prototype method is vkluchaja voltage (see pages 15-17 of the said book), the modulation signal of the pathogen, strengthening and broadcasting noise and interference signals.

However, the prototype method has the following disadvantages: low efficiency of suppression networks using packet technology, due to the fact that the implementation of this method small duration (10-100 MS) messages and significant hardware delay (0,5...1,0) station interference, making it impossible for the reply interference in a short time interval of the radiation package repression; large energy and time costs due to the need to create a continuous noise due to random moments of the beginning of the packet; the impossibility of simultaneous suppression of multiple radiation sources one station interference.

The aim of the invention is to develop a method radiomodule communication channels that enhance the effectiveness of the interference while reducing the time and energy cost of achieving a given effect suppression, and achievement opportunities at a constant resource station interference suppress multiple radiation sources operating in different packet radio networks.

Post the crystals of radiation sources, determination of their parameters, the formation of the structure of the modulating voltage, the modulation signals of pathogens, strengthening and broadcasting noise and interference signals, after measuring the parameters of received signals of the radiation sources at frequencies f1, ...,fiadditionally, in a given interval of time TCsequentially, starting with the source signal radiation at frequency f1to measure the total time ti(i=1,2,3,...), during which no reception at frequency fi. Then generate control signals that specify the operation mode of the control device of the transmission and the structure of the modulating voltage. Further modulate the signals of pathogens, strengthen them in the transmitter noise and emit in the broadcast mode, the specified signal of the control device of the transmission, during the time interval ti. Then calculate the released time resource suppression formula . These steps, starting from the total measurement time tirepeat up until the condition > ti+1. The signal that specifies the operation mode of the control device of a transmission, includes: configuring the agent on one of the detected frequencies (f1f2f

Specified a new set of essential features due to the fact that it takes into account information about the current channel load avoids the emission of continuous noise with intensity, tending to 1, and thereby minimize the costs of interfering resource (time radiation) for achieving a given effect suppression channel packet radio network, and also to carry out the reallocation of the unused part to the suppression of other radiation sources.

In Fig. 1 shows the timing chart explaining the operation of the proposed method with suppression of channels packet radio networks, operating at different frequencies; Fig. 2 - the dependence of the average size of the queue of ready to transmit packets and the number of repetitions of the package from the total channel utilizationsumFig. 3 - the dependence of the normalized mean time bring the package to the recipient and its dispersion (DDovfrom the total channel utilizationsumFig. 4 - dependence of the average size of the queue of ready to transmit packets and the number of repetitions of the package, the intensity of the radiation ol the dependence of the normalized mean time bring the package to the recipient and its dispersion (DDovthe intensity of the radiation intentional interferencejat different intensities of transmission of information packetsandFig. 6 is a structural diagram of the station interference that implements this method radiomodule communication channels.

The ability of the proposed method radiomodule channel packet radio network is explained by the following. It is known that in the channels of packet radio networks, information is transmitted using a sequence of short (10-100 MS) messages with random intervals of sequence packets, which is a continuous interconnected sequence of bits transmitted or received as a whole. When this packet is used collective channel with random multiple access Protocol thereto (see Kleinrock HP computer system with queues. - M.: Mir, 1979, section 5.11, S. 405. section 5.12, S. 441.). A Protocol is a set of rules and formats that determines the order of interaction between the communications component and the terminal equipment of subscribers of the communication system, (see black Yu computer Networks: protocols, standards, interfaces. -M. : Mir, 1990, S. 510). To suppress such a channel in a known manner, you must create interfering radiation is due to random moments of the beginning of a packet, short and differ from each other in the length of the packet ( Fig. 1,a) and significant hardware delays stations interference, i.e., reaction time station interference on the appearance of the channel signal from another package. Obviously, with continuous radiation interference at the frequency of the suppressed channel can interfere with the transmission of messages, but it will lead to unnecessary consumption of interfering resource, i.e., energy and time of radiation.

Because the network packet is constructed and operated according to the principles of public service systems, their operational characteristics (the average size of the queue of pending its packet, the average delay time - stay package in the transmission system and the average number of retransmissions of the same packet) depends on the statistical parameters of the distribution of durations of the incoming transmission packets and gaps between adjacent receipts) of the input packet stream and asked them a total load factor of the channel -sum(Fig. 2 and Fig. 3). In addition, it can be shown that the total channel loadsumunder the influence of intentional interference depends not only on the intensity of generation of new packages and is. Churov's S. R., Shishkov A. I., Volkov, C. E. Model of the air interface packet radio network Protocol CSMA/CD in terms of the impact of concentrated simulating interference // In the book. abstracts of the III International conference Mcsis-94. - C.-P.; Leningrad, 1994, 24...28 Oct., C. 347-352.). The analysis of the characteristics of packet radio networks carried out in this work showed. The key problem of the functioning of the Protocol random multiple access is to fight for access to the channel between users ready to transmit its information packet and a noise pulse "exciting" part of the temporary channel resource. The probability that any user's access to the channel will be resolved within a time not exceeding a specified depends on the intensity occur in the channel interference. Based on the analysis results obtained justified the conclusion that for effective radiomodule channel packet radio network Protocol random multiple access requires that the proposed method of radiomodule provided such "use" temporary channel resource, which would allow the total load factor is equal to its maximum possible value for the given Protocol. In this pothered ready to transmit packets and the time of bringing these packages to recipients will tend to infinity. Thus, using the information about the intensity of the transmission channel, by using the proper intensity of the radiation noise to bring the total load in the suppressed channel to values at which for a given set of network users will not observe the requirements on the quality of message transmission, i.e., the average values of the characteristics for bringing the package to the consumer will accept the defaults or exceed them and will go to infinity ( Fig. 4 and Fig. 5).

To implement the proposed method is possible using the following steps. At the initial stage, the signal packet radio networks, operating at a frequency f1( Fig. 1,a). In the process of admission is automatic measurement values of the carrier frequency. At the same time during the reception of signals at a frequency f1output intermediate frequency of the receiver is fed to a spectrum analyzer to determine the type of modulation and measuring the width of the spectrum of the received signals. In addition, the intermediate frequency signal enters the unit automatically measuring the intensity of transmission in a controlled channel. The last operation can be implemented by counting in a given PR is i.i.d. thus the time interval t1will be equal to the minimum required time interval of interference radiation at this frequency, bringing the total load that channel to its system limit. Under the system limit bandwidth refers to the potential throughput of the latter, dependent implemented in its communication protocols (in General tends to 1). Released when the resource time of suppression can be selected to suppress communication channel operating at a different frequency. Next, the reception signals of the measurement of its characteristics has been repeated at a frequency f2(Fig. 1,b). In this case, if the time interval t2less , after computing the remainder of a temporary resource, the process of receiving and measuring the parameters of transmission has been repeated at a frequency f3and so on(Fig. 1). The formation of the structure of the signal that specifies the mode of the device transmission control (Fig. 1,g), as follows. For the process of receiving and analyzing information about the parameters of the detected signals, the command control unit is a configuration of each available at the station interference pathogens on one of the frequencies of the received signal of the radiation source (fthe th, command control block unit modulating signals, generates a signal that specifies the type of modulation and the width of the spectrum generated by the pathogen interference. After which the unit transmission control generates the control signals switch voltages coming from pathogens than sets the duration of the connection, (t1, t2, t3,...) each of the agents to the transmitter (Fig. 1,g ), and the total duration of the radiation transmitter, Opera last on the cycle time of emission TC(Fig. 1,g).

The procedure of the proposed method can be implemented, for example, using station interference, one of the variants of the structural scheme of which is shown in Fig. 6. Measurement of signal parameters is carried out by commands received from the control unit 1, using the apparatus of the reception and analysis 2. In the process of determining the parameters of the signal received at the frequency fiunit determining the intensity of transmission 3 automatically records the total time tithe minimum required duration of radiation on fiin a given time interval TC. The resulting monitoring this frequency information is accumulated in zapominayusche the boron information about the currently running time packet radio networks, pogledi delivers the commands to the noise shaping unit 4, by which pathogens 4.1 (in the General case, the number of pathogens can be arbitrary, but more than one) are configured on the selected to suppress frequency; the output of the modulating signals 4.2 signals that define each of the agents 4.1 type of modulation and the desired width of the spectrum; the device transmission control 4.3 specifies the duration of radiation (t1, t2, t3,...) for each frequency (f1f2f3,...), respectively, and supplies these signals to the switch 4.4 simultaneously with the signal of the unlocking and locking of the transmitter interference 5 at time TC. As devices that implement these steps can be used, for example, commercially available samples: device poiska-direction-finding P-330 SCP; spectrum analyzer R-399 T; a control unit station P-330 UUS; the unit of measurement of the intensity of transmission can be constructed according to well-known schemes of measuring time intervals (Reference measuring instruments / 3 so / so 2 edited Nasonova C. S. M., Soviet radio, 1977, S. 272).

1. How radiomodule communication channels, including the reception signals of the radiation sources, the determination of their Oia, amplification and radiation of noise and interference signals, wherein when the reception signals of the radiation sources channel packet communication advanced distributed resource suppression, which for each cycle suppression with the set interval TCat each operating frequency of the source radiation fiwhere i 1,2,3,N is the current number of the radiation source, since f1to measure the total time tiduring which there is no signal at the first frequency, and take it equal to the time of radiation of interfering signal at that frequency, and then calculates a temporary resource tpiremaining in this cycle of suppression by the formula compare it with the value of ti+1and when the inequality tpi< ti+1the process of resource allocation suppression cease, and the number of suppressed communication channels N is equal to i, which is this inequality.

2. The method according to p. 1, characterized in that the control signal forming transfer mode includes selecting the carrier frequencies of disturbances signals coincident with the working frequencies of the signals received emitters channel packet, the production of signals upravlja TCand control signal radiation at the beginning and end of the cycle suppression.

 

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