Adaptive device for transmitting data

FIELD: electronic engineering.

SUBSTANCE: device has data processing circuit, transmitter, commutation unit, endec, receiver, computation unit, and control unit.

EFFECT: high reliability in transmitting data via radio channel.

4 dwg

 

The proposed device relates to the field of radio engineering and can be used in adaptive radio systems for radio data.

It is known device described in the application for invention No. 99123808, Derkach E.N., Popov V.I., Lazorenko B.C., Silocone GN. "Method of discrete information transmission in a radio link with pseudorandom change the operating frequency and the device for its realization", 2001, which is on the receiving end of the radio link control noise at frequencies of reception and generate control information for the reconstruction of the transmitter station on the frequency with the lowest interference level.

The disadvantage of this device is that the change in the signal quality of the radio link does not affect the signal parameters that affect performance, such as speed pulses and coding scheme.

It is known device described in the patent for invention №2097923, Bulychev O.A., Ignatov V.V., A. Shchukin. "Method of discrete information transmission in a radio link with pseudorandom change operating frequencies and the device for its realization", 1997, in which unit increases the speed of the pulse. The disadvantage of this method is that changing the parameters of the signal does not depend on the signal quality of the radio link.

The closest in technical essence is proposed device, as described in the application of the Russian Federation for invention №2000131204, Kuznetsov UD "data transmission over the communication channel with variable speed transmission", 1999, adopted for the prototype.

The device is a prototype designed for mobile radiotelephony.

Functional diagram of the device of the prototype is presented in figure 1, where the following notation:

1 - buffer;

2 is a diagram of data (SOD);

3 - transmitter.

The device prototype contains serially connected buffer 1, SOD 2 and the transmitter 3. The input buffer 1 is an input device, and the output of the transmitter 3 output device.

The device prototype works as follows. Data intended for transmission over the communication channel are received in the buffer 1. SOD 2 on the basis of these data determines the first transmission speed, and generates data bits from the first transfer rate in the data blocks of fixed size. Each data block has the same number of bits. The transmitter 3 transmits over the communication channel with the first transmission rate during one or more predefined time intervals of the first number of data blocks on a time interval corresponding to the first transmission speed. When the change speed transmission in the communication channel with the first transmission speed to the second speed transmission SOD 2 detects this change and generates b is you data with the second transmission rate in the data blocks of fixed size. The transmitter 3 transmits the second number of blocks of data at a time interval corresponding to the second transmission rate, within one or more predefined time intervals.

The fixed size of each data block is determined based on the maximum frequency that can change the transmission rate and the lowest available transmission rate at which data can be transmitted, i.e. does not depend on the interference situation in the channel, which entails a reduction of the probability of correct reception of the information bits.

Thus, a significant drawback of the prototype method is the low reliability of data reception.

To eliminate this drawback in the device containing connected in series circuit of the data processing and transmitter whose output is the output device according to the invention, entered serially connected switching unit and the codec, connected in series by the bus receiver and the computing device, and the control unit, the first and second outputs of which are connected to second inputs of the switching unit and the codec, respectively, the second inputs of which are connected by buses to the corresponding inputs of the computing device, the output of which is connected to the input of the control unit, in addition, the codec output soy is inen with the input pattern data, thus the inputs of the switching unit and the receiver are respectively the first and second inputs of the device.

Functional diagram of the device is presented in figure 2, where the following notation:

1 - switching unit (Bq);

2 - the control unit (cu);

3 - computing device (WS);

4 - codec;

5 is a diagram of data (SOD);

6 receiver;

7 transmitter.

The proposed device has connected in series BK 1, 4 codec, SOD 5 and the transmitter 7, the output of which is the output of the device and connected in series by the bus receiver 6 and WU 3, the output of which is connected to the input BU 2, the first and second outputs of which are connected to second inputs Bq 1 codec and 4, respectively, the second inputs of which are connected by buses to the corresponding inputs of a computing device. The first input Bq 1 is the first input device. The input of the receiver 6 is the second input device.

The proposed device operates as follows. Data from technical speed With Baud (equal information speed bit/s)intended for transmission over the communication channel, proceed in BK 1, where there is a set z technical velocities of B1,... ,BzBps (B1C,... ,BzC). Bq 1 converts the data rate from the Baud rate BzzBo is (B zz[B1Bz]) in accordance with the control signal coming from BU 2. From Bq 1 a data rate of Bzzenter the 4 codec that can encode incoming information in one of the q error correcting codes (n, k, t)1,... ,(n, k, t)q. Codec 4 encodes a data rate of Bzzcode (n, k, t)qq[(n, k, t)1(n , k, t)q] in accordance with the control signal coming from BU 2.

SOD 5 of coded codec 4 of these on the basis determined in Bq 1 transmission speed generates data blocks of fixed size. Each data block has the same number of bits. The transmitter 7 transmits the communication channel defined in Bq 1 transmission speed BzzBps within a predefined time interval t for some number of blocks of data at a time interval corresponding to the transmission speed.

The characteristics of the noise and signals are sent via radio to the receiver 6. WU 3 on the basis of the received from the receiver 6 characteristics on the well-known algorithm calculates q· z probability of correct reception of data transmitted within a predetermined time interval τ . These probabilities are calculated VU 3 is obtained from BK 1 options transfer rate B1,... ,BzBaud and received from the codec 4 possible options error correcting code (n, k, t)1,... ,(n, k, t)q. The value defined in WU 3 maximum probability of correct reception comes in BU 2, which identifies the corresponding non transfer rate zz and error-correcting code qq and they formed the basis of the control signals for BC 1 and 4 codec, define their values Bzzand (n, k, t)qqrespectively.

As an example, assume that a radio with a set of technical speed 1.2-9.6 kBaud, data are transmitted from the data transmission equipment with a speed of 1.2kbit/with. The codec radio has the ability to encode incoming data codes Hamming (N(7,4)) and reed-Mahler (RM(31,6)), and send data without encoding (mode b/C). In radio mode, pseudo-random adjustment of the operating frequency (frequency hopping) 100 SCAC/sec, therefore, a predetermined time interval τ =10 msec is determined by the time work on the same frequency. SOD generates data blocks of 12 bits each. Depending on the transmission speed at a predefined time interval t can be transferred 1, 2, 4 or 8 data blocks as shown in figure 3:

a - technical speed of 1200 Baud without coding;

b - technical speed 2400 Baud without coding;

in technical speed 2400 Baud with the encoding code Khem is Inga (7,4);

g - technical 4800 Baud rate without coding;

d - technical 4800 Baud rate with coding code the Hamming (7,4);

e - technical 9600 Baud without coding;

W - technical 9600 Baud with coding code the Hamming (7,4);

C - technical 9600 Baud with the encoding code reed-Mahler (31,6).

The probability of correct reception of information symbols in the interval τ when each is shown in figure 3 transmission under the influence of witness interference with the coefficient of lag θ shown in figure 4. Therefore, the curve, which should work adaptive device data represents the envelope of all 8 charts:

- when θ =... 0,175 radio operates in the transmission mode information 9600 Baud without coding;

- when θ =0,175... 0,245 radio operates in the transmission mode information to 9600 Baud with coding code the Hamming (7,4);

- when θ =0,245... 0,367 radio operates in the transmission mode information 4800 Baud without coding;

- when θ =0,367... 0,496 radio operates in the mode of information transmission at 4800 Baud with coding code the Hamming (7,4);

- when θ =0,496... 0,642 radio operates in the mode of information transmission 2400 Baud without coding;

- when θ =0,642... 0,79 radio operates in the transmission mode information to 9600 Baud with the encoding of Kodo, the reed-Mahler (31,6);

- when θ =0,79... 1 radio station operates in the mode of information transmission 2400 Baud with coding Hamming code (7,4).

Thus, increasing the reliability of data reception.

The proposed device is implemented physically-based items and blocks, widely known from the technical literature.

This device is essentially a fully digital device. The use of digital elements allows to simplify the technical performance of the device; significantly reduce the dimensions of the product in which it will be used, as well as to reduce cost, increase reliability in reducing the impact of instability of the parameters of the schema elements and their parasitic parameters.

In addition, the algorithm proposed device can be used in SCS exposed to intentional interference.

Adaptive data device containing connected in series circuit of the data processing and transmitter whose output is the output device, wherein the entered serially connected switching unit and the codec, connected in series by the bus receiver and the computing device, and the control unit, the first and second outputs of which are connected to second inputs of the switching unit and the codec, respectively, is that the outputs of which are connected by buses to the corresponding inputs of the computing device, the output of which is connected to the input of the control unit, in addition, the codec output is connected to the input circuits of the data processing, while the inputs of the switching unit and the receiver are respectively the first and second inputs of the device.



 

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