RU72590U1 - HIGH SPEED STATIONARY RADIO STATION - Google Patents

Abstract

The proposed device relates to radio engineering and can be used to organize high-speed networks and packet duplex radio communications for the exchange of digital information, the source of which can be used a personal computer (PC). The technical result is the expansion of the functionality of the radio station by increasing the speed of reception and transmission of data. This is achieved by the fact that the encoder (3) and the modulator (10), the demodulator (11) and the decoder (9) connected in series are connected to the transmit-receive channel (I), the output of the modulator (10) is connected to the first input of the transmitter (4 ), the input of the encoder (3) is the information input of the transmission / reception channel (I) and connected to the information output of the control unit (1), the information input of which is connected to the information output of the transmission / reception channel (I), which is the output of the decoder (9), the output of the receiver (5) is connected to the first input of the demodule torus (11), the control outputs of which are connected to the corresponding control inputs of the receiver (5), in addition, the input-output of the control unit (1) is an interface of high-speed Ethernet information networks, while the serial connection of the control unit (1) and the receiving channel transmission (I) is performed by a bi-directional control bus, in addition, the second inputs of the encoder (3), decoder (9), modulator (1), demodulator (11) and antenna switch (6) are connected to the input of the frequency synthesizer (2).

Description

The utility model relates to radio engineering and can be used to organize high-speed networks and packet duplex radio communications for the exchange of digital information, the source of which can be a personal computer (PC).

A large number of wearable and transportable radio stations are known, for example, R-159M IP1.100.63, radio stations according to utility model patents No. 27764, No. 311181, etc., performing similar functions.

The disadvantages of these radio stations are:

- low data transfer rate from terminal equipment;

- the lack of the ability to transfer information from a PC and remote control of modes and types of work;

- the impossibility of automated input of radio data, which means the values of the operating frequencies and identifiers of the radio station;

- the absence of adaptive changes in the transmission speed and type of modulation depending on the interference environment;

- lack of error-correcting coding and decoding of information for further reliable recovery of radio data at the receiving side;

- the impossibility of providing a radio interface between the infrastructure equipment of high-speed data transmission networks using the high-speed Ethernet information transmission interface (standard for organizing local networks 802.3 and 802.3u) with a data transfer rate of 10/100 Mbit / s;

- lack of support for network protocols IP, ARP, ICMP, AGMP, TCP, UDP;

- the inability to work in the multiplexing mode with orthogonal frequency division of signals (OFDM);

- the inability to work with modulation types such as BPSK, QPSK, 16QAM, 64QAM;

- the inability to work in the time-frequency division mode of the channels of reception and transmission of information (FDD-HD half duplex);

- the inability to adjust the output power of the transmitter.

The closest in technical essence to the proposed one is the radio station R-163-50U IV1.106.016 [Complex of radio communications "Crossbow". Transportable VHF radio stations. Publisher YOU. 1996 UDC. 621.396.7], adopted as a prototype.

Figure 1 shows a generalized structural diagram of a prototype radio station, where it is indicated:

1 - control unit (CU);

1-channel data reception;

2 - frequency synthesizer;

4 - transmitter;

5 - receiver;

6 - antenna switch;

7 - antenna;

8 - antenna matching device (ACS);

12, 13 - the first and second information switches.

The prototype device contains a series-connected control unit 1 and a channel for receiving and transmitting data I, as well as the first 12 and second 13 information switches.

The receive-transmit channel 1 contains a frequency synthesizer 2, the input of which is the first input of channel 1 and connected to the second inputs of the transmitter 4 and receiver 5, the third inputs of which are connected to the output of the frequency synthesizer 2. The output of the transmitter 4 is connected to the first input of the antenna switch 6, the output which is connected to the first input of the receiver 5, the output

which is the output of the channel for receiving and transmitting information 1 and is connected to the input of the second information switch 13, the outputs of which are outputs of digital and voice information, respectively. In addition, the output-input of the antenna switch 6 through the ACS 8 is connected to the antenna 7. The control input of the antenna switch 6 is the second input of channel 1 and is connected to the second output of the control unit 1, the third output of which is connected to the control input of the first information switch 12, the output of which connected to the information input of channel I, which is the first input of the transmitter 4. The first and second inputs of the first switch 12 are inputs of digital and voice information, respectively.

The prototype device operates as follows.

In the transmission mode, information from a digital information source (Istsi) or from a voice information source (Istri) through the first information switch 12, which determines the sequence of its use depending on the state of the control input, which is controlled by the signal from the third output of control unit 1, is fed to the information input channel data reception-transmission 1, which is the first input of the transmitter 4, then the signal through the antenna switch 6 and ACS 8 is fed to the antenna 7.

A signal is received at the second input of the transmit-receive channel 1 from BU 1, which controls the switching of the input-output of the antenna switch 6 to the output of the transmitter 4 or to the first input of the receiver 5. In the reception mode, the signal from the antenna 7 through the ACS 8 and the antenna switch 6 enters the receiver 5, from the output of which information through the second switch 13 is fed simultaneously to the first and second outputs from which the signals of digital and NN formations (DI) and voice information (RI) are fed to a digital information receiver (PRI) and a voice information receiver (PRRI ) correspondence enno.

The signal from the control unit 1, arriving at the first input of the transmit-receive channel I, controls the tuning of the frequency synthesizer 2 and the operation of the transmitter 4 and receiver 5.

The disadvantages of the prototype device are:

- low data transfer rate from terminal equipment;

- the lack of the ability to transfer information from a PC and remote control of modes and types of work;

- the impossibility of automated input of radio data, which means the values of the operating frequencies and identifiers of the radio station;

- the absence of adaptive changes in the transmission speed and type of modulation depending on the interference environment;

- lack of error-correcting coding and decoding of information for further, reliable restoration of radio data at the receiving side;

- the impossibility of providing a radio interface between the infrastructure equipment of high-speed data transmission networks using the high-speed Ethernet information transmission interface (standard for organizing local networks 802.3 and 802.3u) with a data transfer rate of 10/100 Mbit / s;

- lack of support for network protocols IP, ARP, ICMP, AGMP, TCP, UDP;

- the inability to work in multiplexing mode with orthogonal, frequency division signal separation (OFDM);

- the inability to work with modulation types such as BPSK, QPSK, 16QAM, 64QAM;

- the inability to work in the time-frequency division mode of the channels for receiving and transmitting information (FDD-НD half duplex;

- the inability to adjust the output power of the transmitter.

To eliminate these shortcomings in a radio station containing a serially connected control unit and a data reception-transmission channel consisting of a serially connected transmitter and antenna

a switch, the output-input of which is connected to the antenna through an antenna matching device, while the output of the antenna switch is connected to the first input of the receiver, as well as a frequency synthesizer, the input of which is the input of the transmit-receive channel and connected to the second inputs of the transmitter and receiver, the third inputs which are connected to the output of the frequency synthesizer, according to a utility model, sequentially connected encoder and modulator, serially connected demodulator and decoder, and second inputs the encoder, decoder, modulator, demodulator and antenna switch are connected to the input of the frequency synthesizer, the modulator output is connected to the first input of the transmitter, the encoder input is the information input of the transmit-receive channel and connected to the information output of the control unit, the information input of which is connected to the information output of the receive channel -transmission, which is the output of the decoder, while the output of the receiver is connected to the first input of the demodulator, the control outputs of which are connected to the corresponding control input receiver further input-output control unit is a high speed Ethernet interface information network, wherein a series connection of the control unit and the reception channel transmission configured bidirectional control bus.

Figure 1 shows a diagram of a prototype device, figure 2 is a structural diagram of the proposed device, figure 3a is a diagram of an encoder, figure 3b is a diagram of a decoder; on figa - circuit modulator; on figb is a diagram of a demodulator.

The structural diagram of the proposed radio station is shown in figure 2, where it is indicated:

1 - control unit;

1 - channel for receiving and transmitting data;

2 - frequency synthesizer;

3 - encoder;

4 - transmitter;

5 - receiver;

6 - antenna switch;

7 - antenna;

8 - antenna matching device (ACS);

9 - decoder;

10 - modulator;

11 - demodulator.

The proposed radio station contains a control unit 1, the control output-input of which is connected by a bi-directional control bus to the control input-output of the data reception-transmission channel, the input-output of the control unit 1 being the interface of high-speed Ethernet information networks.

The data transmission / reception channel 1 contains a series-connected encoder 3, a modulator 10, a transmitter 4, and an antenna switch 6, the output-input of which is connected to the antenna 7 through an ACS 8, as well as a series-connected receiver 5, a demodulator 11, and a decoder 9, the output of which is the information output of the transmit-receive channel 1 and is connected to the information input of the control unit 1, the information output of which is the information input of the transmit-receive channel 1 and the first input of the encoder 3. In addition, the output of the frequency synthesizer 2 is connected to these are the inputs of the transmitter 4 and receiver 5, and the input of the synthesizer 2 is connected to the control input-output of the transmit-receive channel 1 and connected to the second inputs of the encoder 3, modulator 10, transmitter 4, receiver 5, demodulator 11, decoder 9, and antenna switch 6. In this case, the control outputs of automatic gain control (AGC) and automatic frequency control (AFC) of the demodulator 11 are connected to the corresponding control inputs of the receiver 5, respectively, the output of the antenna switch 6 is connected to the first input of the receiver 5.

The block diagram of the encoder 3 is shown in figa, where indicated:

3.1 - Reed / Solomon block encoder; 3.2 - convolutional encoder; 3.3 - interleaver.

Encoder 3 contains series-connected Reed / Solomon 3.1 block encoder, convolutional encoder 3.2 and interleaver 3.3, the output of which is the output of encoder 3. The input of Reed / Solomon 3.1 encoder is the first input of encoder 3, the second input of which is connected to the second inputs of blocks 3.1, 3.2 , 3.3.

The structural diagram of the decoder 9 is shown in Fig.Zb, where indicated:

9.1 - reverse interleaver; 9.2 - Reed / Solomon block decoder; 9.3 - Viterbi decoder.

Decoder 9 contains a series-connected reverse interleaver 9.1, a Reed / Solomon block decoder 9.2, and a Viterbi decoder 9.3, the output of which is the output of decoder 9. The input of the interleaver 9.1 is the first input of decoder 9, and its second input is connected to the second inputs of blocks 9.1, 9.2, 9.3 .

The block diagram of the modulator 10 is shown in figa, where indicated:

10.1 - block forming characters BPSK, QPSK, 16QAM, 64QAM, from the input data stream; 10.2 - block substitution of the pilot signal and protective characters; 10.3 - block inverse fast complex Fourier transform; 10.4 - block interpolator and digital low-pass filter; 10.5 - digital-to-analog converter (DAC).

The modulator 10 contains a series-connected block of character formation BPSK, QPSK, 16QAM, 64QAM from the input data stream 10.1, a substitution block for the pilot signal and protective sub-characters 10.2, an inverse fast complex Fourier transform 10.3, an interpolator and a digital low-pass filter 10.4, and a DAC 10.5 whose output is the output of the modulator. The input of the character generation unit BPSK, QPSK, 16QAM, 64QAM from the input data stream 10.1 is the first input of the modulator 10, the second input of the modulator 10 is connected to the second inputs of the blocks 10.1, 10.2, 10.3, 10.4, 10.5.

The structural diagram of the demodulator 11 is presented figb, where indicated:

11.1 - analog-to-digital Converter (ADC); 11.2 - block digital low-pass filter and thinning device; 11.3 - block fast complex Fourier transform; 11.4 - block allocation of the pilot signal and protective sub-characters; 11.5 - block for generating a stream of data bits from the symbols BPSK, QPSK, 16QAM, 64QAM, 11.6 - controller for automatically adjusting the gain of the receiver; 11.7 - automatic frequency control controller.

The demodulator 11 contains a serially connected ADC 11.1, a digital low-pass filter unit and a decimation device 11.2, a fast complex Fourier transform unit 11.3, a pilot signal and protective sub-symbols 11.4, and a data bit stream generating unit from the BPSK, QPSK, 16QAM, 64QAM 11.5 symbols, the output of which is the output of the demodulator 11. In addition, the output of the ADC 11.1 is connected to the first input of the controller for automatically adjusting the gain of the receiver 11.6, the output of which is the control output of the AGC. The output of the digital low-pass filter block and decimation device 11.2 is connected to the first input of the automatic frequency control controller 11.7, the output of which is the control output of the AFC, the output of the fast complex Fourier transform 11.3 is connected to the third input of the automatic frequency control controller 11.7. The ADC input 11.1 is the first input of the demodulator 11, the second input of which is connected to the second inputs of the blocks 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7.

The proposed device operates as follows.

When the power is turned on, the proposed radio station automatically switches to the mode of receiving service synchronization packets. In the absence of synchronization packets, the proposed radio station itself begins to emit synchronization packets in accordance with the established standard, for example, according to the standard 802.16d. A radio station receiving service synchronization packets generates information confirmation packets and forms

high-speed packet radio communication network using the principle of time-frequency division of channels for receiving and transmitting information (FDD-HD - half duplex) and providing radio access point-to-point.

Any radio station located in a point-to-point radio access network goes into the transmission mode by the "Request for Transfer" signal from a digital information source, in this case, from the interface between the infrastructure equipment of high-speed data networks using the high-speed Ethernet information transfer interface (standard for organizing local networks 802.3 and 802.3u), with a data transfer rate of 10/100 Mbit / s. Ethernet network data goes to the input-output of control unit 1, where the methods of medium access, frame format, addressing, support for access to the communication channel are implemented, information and control frames are received and transmitted, and transmission and reception errors are detected. The transmitted information packets, which are a continuous stream of bytes, from the corresponding information output of the control unit 1 through the information input of the transmit-receive channel 1 are sent to the input of the encoder 3, where the byte stream is encoded under the control of the control unit 1, which is provided by the Reed / Solomon 3.1 block encoder. After processing in the Reed / Solomon 3.1 block encoder, the byte stream is supplied as a sequential bit stream to the convolutional encoder 3.2, which introduces redundancy in the bit stream. After the convolutional encoder 3.2, the bit stream is fed to the input of the interleaver 3.3, where the bits coming from the convolutional encoder 3.2 are interleaved with the specified interval and depth values. Further, from the output of encoder 3, the bit stream is fed to the input of modulator 10, where, under the control of control unit 1, in block 10.1 it is converted to BPSK, QPSK, 16QAM or 64QAM symbols, preferably with orthogonal frequency division, and goes to block 10.2, where the substitution of pilot symbols . Next, a new generated sequence arrives at block 10.3 inverse fast Fourier transform. Upon completion of the modulation, the digital sequence is preferably

fed to block 10.4 and, if necessary, interpolated to a higher frequency before output to the DAC 10.5, the output signal of which is the output signal of the modulator 10. Next, the signal from the modulator 10 is fed to the first input of the transmitter 4, where, under the control of the control unit 1, the necessary control of the transmitter 4 and control of the required level of output power of the transmitter 4, is fed to the antenna switch 6, where under the control of the control unit 1 through the antenna matching device 8 is supplied to the antenna 7 and from the channel th rate of up to 37.2 Mbit / s is emitted in the air.

In the receiving mode, the radio station located in the network performs the reverse conversion of the signal received by the antenna 7. The signal through the ACS 8 and under the control of the control unit 1 of the antenna switch 6 is fed to the input of the receiver 5 and then to the demodulator 11, where the analog signal is fed to the input ADC 11.1. The output of the ADC 11.1 is sampled and supplied as a feedback signal in the automatic gain control (AGC) loop, implemented by block 11.6, so that the mode of operation of the ADC 11.1 is maintained in a linear operating range. The output signal of the ADC 11.1 is also supplied to the input of block 11.2, as a result of which the digital signal is digitally processed (DSP) and filtered. After these transformations, the signal is an orthogonal frequency division symbol, which is fed into the feedback loop of the automatic frequency adjustment implemented by block 11.7, so that the reception frequency coincides with the frequency of the received signal. Further, the symbols with orthogonal frequency division are supplied to the fast complex Fourier transform block 11.3, as well as to the feedback loop of the automatic frequency adjustment realized by the block 11.7 to its second input, so that the receive frequency coincides with the frequency of the received signal, moreover, the automatic frequency control controller 11.7 can be controlled directly from the control unit 1 via the control bus of the data receiving-transmitting channel I, by a signal supplied to the second input of the demodulator 11,

and then to block 11.4, where the allocation of sub-symbols and pilot synchronization signals.

In the next demodulation step, in block 11.5, the received BPSK, QPSK, 16QAM, 64QAM characters are converted to a bit stream received at the output of demodulator 11. Next, the bit stream is deinterleaved in block 9.1 of decoder 9. The reverse interleaver 9.1 places the bits in the same order in which they were in the original transmitted signal. Next, the serial data stream enters the Viterbi decoder 9.2, where the bit rate decreases to correct errors and enters the Reed / Solomon 3.1 decoder to correct the remaining errors. Next, the generated information stream enters the control unit 1 for converting it into the format of the received data corresponding to the standard of organization of local networks 802.3 and 802.3u Ethernet, where the methods of medium access, frame format, addressing, support for access to the communication channel are implemented, reception and transmission are carried out information and control frames, transmit-receive errors are detected and is fed to the input-output of control unit 1 for further connection of the radio station to high-speed network infrastructure equipment transmitting information using the high-speed Ethernet information transfer interface.

Each radio station analyzes the signal-to-noise ratio and, as a result, the quality of information exchange at the operating frequency. With a poor signal-to-noise ratio, the radio station can adaptively change the type of coding and the type of modulation to ensure the necessary quality of information exchange at the operating frequency.

The blocks of the proposed radio station such as encoder 3, decoder 9, modulator 10, demodulator 11, block encoder Reed / Solomon 3.1, block convolutional encoder 3.2, interleaver 3.3, inverse interleaver 9.1, Viterbi decoder 9.2, block decoder Reed / Solomon 9.3, block formation characters BPSK, QPSK, 16QAM, 64QAM 10.1, block substitution of the pilot signal and protective sub-characters 10.2, block inverse fast complex Fourier transform 10.3, block interpolator

and a digital low-pass filter 10.4, a digital low-pass filter block and a decimation device 11.2, a fast complex Fourier transform block 11.3, a pilot signal and protective sub-symbol extraction block 11.4, a data bit stream generating unit 11.5 from the BPSK, QPSK, 16QAM, 64QAM symbols, the receiver gain automatic adjustment controller 11.6, the 11.7 automatic frequency adjustment controller can be performed using user-programmable gate arrays, which are field programmable matrix LSIs gate array) or technologies based on special integrated circuits (SIS), or partially be part of the control unit 1, made, for example, on a digital signal processor (DSP) TMS320C64xx.

Thus, the proposed radio station allows you to:

- work in the frequency range 3.4-3.6 GHz;

- have a transmitter signal spectrum that complies with IEEE 802.16d (conventional signal spectrum width is 10 MHz);

- provide a digital data transfer rate of up to 12 Mbit / s;

- support the ability to work with types of modulation type BPSK, QPSK, 16QAM, 64QAM;

- support the time-frequency division of the channels of reception and transmission of information (FDD-HD - half duplex);

- provide the ability to adjust the output power of the transmitter;

- provide the output power of the radio station at least 100 mW;

- ensure the probability of erroneous reception of bits equal to 10 during QPSK modulation and a signal bandwidth of 10 MHz should be no more than minus 83 dBm;

- ensure the transmission and reception of digital information at the Ethernet interface that meets the requirements of the standard 802.3 and 802.3u;

- provide a communication range when working with QPSK modulation up to 20 km while ensuring conditions of direct visibility;

- support network protocols IP, ARP, ICMP, AGMP, TCP, UDP.

Claims (1)

A high-speed stationary radio station containing a serially connected control unit and a data reception-transmission channel, consisting of a serially connected transmitter and an antenna switch, the output-input of which is connected to the antenna through an antenna matching device, while the output of the antenna switch is connected to the first input of the receiver, and also a frequency synthesizer, the input of which is the input of the transmit-receive channel and is connected to the second inputs of the transmitter and receiver, the third inputs of which are connected to the output ohm of the frequency synthesizer, characterized in that a serial encoder and a modulator, a serially connected demodulator and a decoder are introduced into the receive-transmit channel, the second inputs of the encoder, decoder, modulator, demodulator and antenna switch connected to the input of the frequency synthesizer, the modulator output connected to the first the input of the transmitter, the encoder input is the information input of the transmit-receive channel and is connected to the information output of the control unit, the information input of which is connected to the information the output of the transmit-receive channel, which is the output of the decoder, while the output of the receiver is connected to the first input of the demodulator, the control outputs of which are connected to the corresponding control inputs of the receiver, in addition, the input-output of the control unit is an interface of high-speed Ethernet information networks, with a serial connection the control unit and the transmit-receive channel is made bidirectional control bus.