The transmitting device phase-shift keyed signals

 

(57) Abstract:

The transmitting device phase-shift keyed signals relates to the field of discrete information transmission and can be used in radio channels to transmit information in communication with both moving and stationary objects. Technical result achieved is the reduction of power losses, povyshenie efficiency. The transmitting device phase-shift keyed signals contains a source of information, basic modulator, balanced modulator, the control unit, the pseudo-random sequence generator, synchronizer, the generator carrier frequency, n electronic keys, the constant current source and the adder. 4 Il.

The device relates to the field of discrete information transmission and can be used in radio channels to transmit information in communication with both moving and stationary objects.

Known transmitting devices phase-shift keyed signals (see L. E. Varakin "communication Systems with noise-like signals" M, "and R. C." 1985, page 18 Fig. 1.9 (a), in which information is fed to the input pulse-width modulator, the output of which the PWM signal is input to the phase modulator. On the of ihoda phase modulator, containing the information fed to the input of the modulator, which is balanced modulation of the oscillations of the carrier frequency from GNC. Then amplified by power amplifier signal through the antenna radiates into space.

Also known transmitting devices (ibid page 19 Fig. 1.11 a and page 20 Fig. 1.12 (a) for digital communication systems.

The closest to the technical nature of the claimed object is a transmitter of a digital communication system with photomanipulating PSS, given in the book by L. E. Varakin "communication Systems with noise-like signals", M, "R and C". 1985, page 16 Fig. 1.7 a, adopted as a prototype.

In Fig. 1 shows a functional diagram of the device of the prototype, where we have introduced the following notation:

1 - the source of information

2 - phase modulator,

3 - balanced modulator,

4 - power amplifier

5 is a pseudo - random sequence generator (gpsa),

6 - synchronizer,

7 - generator carrier frequency (GNC).

The device prototype has the following functional relationship: information source 1 are sequentially connected to the phase modulator 2, the balanced modulator 3 and the amplifier 4, the synchronizer 6 through g is="ptx2">

Function prototype as follows.

From information source 1 a sequence of binary units 1 and 0 with rate R = 1/T is fed to the input of the phase modulator 2, where T is the duration of one information symbol. To the second input of the phase modulator 2 receives photomanipulating signal (SRP) from the pseudo-random sequence generator 5. Photomanipulating signal has a duration T and is a sequence of videokursov 1 and 0 durationo= T/N, where N is the number of pulses. Usually consider that the base of the FM signal is approximately equal to the number of pulses, i.e., N. the generator SRP 5 controls the synchronizer 6, which generates the necessary control signals and frequency. The sequence of PSS in the form of an FM signal carrying information symbols, enters the balanced modulator 3, which is balanced modulation of the oscillations of the carrier frequency of the FM signal. Oscillation with the carrier frequency generated by the oscillator carrier frequency 7. The amplifier 4 amplifies photomanipulating signal, and then through the antenna radiates into space.

The disadvantage of transmitting devices, refer to as analogues and device-protome reduction of power losses is solved in different ways, for example, the use of amplifiers with quantization of the input signal, providing biharmonic and key modes. Of these modes it is necessary to mention widely used energy efficient key mode electro Converter devices (transistors, thyristors). However, modern devices using the key modes of operation, have significant drawbacks. The main one is a wide spectrum of harmonics of the output oscillations. The use of passive filter elements for filtering harmonics up to the required level leads to deterioration of the feasibility and especially mass and size parameters of the devices. To ensure high energy efficiency, improve weight indicators by reducing or exceptions filter devices while maintaining high standards for the spectral composition of the output oscillations should apply shapers of harmonic oscillations (PGA), output voltage which has a stepped shape (see Fig. 2).

To reduce the power loss in the device is a prototype, containing serially connected information source, a phase modulator, balanced, modulate the generator SRP is connected to the output of the synchronizer, entered the control unit, the input connected to the output of the balanced modulator of the n - outputs of the control unit are connected respectively to the control inputs of n keys, the two outputs of the constant current source are connected respectively with the two signal inputs of each of the n keys whose output of which is connected respectively to the n inputs of the adder, the output of which is connected to the antenna.

In Fig. 3 shows a functional diagram of the proposed device, where indicated:

1 - the source of information

2 - phase modulator,

3 - balanced modulator,

4 - control unit,

5 - generator SRP,

6 - synchronizer,

7 - generator carrier frequency,

81- 8n- electronic keys,

9 - constant current source,

10 - adder.

The proposed device has the following functional relationships: connected in series source 1, the phase modulator 2, the balanced modulator 3 and the control unit 4, the n outputs of which are connected respectively to the control inputs of n electronic switches 81- 8nthe outputs of each of which are connected respectively with n-inputs of the adder 10, and the output of this adder is connected to the antenna. The WTO is the first modulator 3 is connected to the output of the generator carrier frequency 7.

The proposed device operates as follows. From information source 1 a sequence of binary units 1 and 0 with rate R = 1/T is fed to the input of the phase modulator 2, where T is the duration of one information symbol. To the second input of the phase modulator 2 receives photomanipulating signal from a pseudo-random sequence generator 5. Photomanipulating signal coming from the generator 5 has a duration T and is a sequence of videokursov 1 and 0, duration = T/N, where N is the number of videokursov. Usually consider that the base of the FM signal is approximately equal to the number of pulses, i.e., N. the generator SRP 5 controls the synchronizer 6, which generates the necessary control signals and frequency. The sequence of PSS in the form of an FM signal carrying information symbols come in balanced modulator 3, which is balanced modulation of the oscillations of the carrier frequency of the FM signal. Oscillations with a carrier frequency generated by the oscillator carrier frequency 7. The output signal of the balanced modulator (PSS) is input to the control unit 4, which is the quantization of its level and the formation of rectangular pulses, similar to Fig. 2 that the odes of these keys is served bipolar DC voltage source 9. As a result, the outputs of electronic keys 81- 8nis a rectangular signal with equal amplitudes A1= A2= A3= ... Anand equal to the amplitude of the DC voltage source 9. These signals are then fed to the adder 10, where the sum and the output of this adder is formed a stepped voltage (see Fig. 2), which goes to the antenna and radiated into space.

When forming a stepped voltage (MV) in the proposed device the principle of quantization of the input signal level. Increase efficiency in these shapers is due to the fact that when the amplification signal of rectangular or trapezoidal shape with an amplitude equal to the supply voltage, the voltage drop on the active devices in the open state will be small, and the efficiency of the driver is close to 100%. Moreover, with the growing number of quantization levels increases the efficiency of the driver, because in this case increases the ratio of pulse duration to the duration of the front or the strengthening of rectangular pulses with a more flat top (C. F. Dmitriev, N. B. Petasin, M. A. the Siver "high shapers of harmonic oscillations" M, "Welts (C. L. Grabow, S. I. Bychkov "Transmitting device", "Owls. radio, M - 1969, page 12). So, for example, at an angle cutoff = 90oEfficiency cascade = 0,79, and at = 650o= 0,9, where the utilization factor of the anode voltage (Transmitting devices. Ed. by B. P. Terentiev. Ed. "Communication", M. 1972, page 19).

One possible implementation of block 8 (electronic keys) shown in Fig. 4, where indicated:

12 - port

11 and 14 - electronic keys,

13 - diagram "OR".

When entering from the control unit 4 negative control pulse operate the inverter 12 and the key 14, and when the positive pulse has a key 11.

The implementation of the remaining blocks and corners is not straightforward, because all they are well known and widely published in technical literature.

The transmitting device phase-shift keyed signals containing serially connected information source, a phase modulator and a balanced modulator, a second input connected to the output of the generator carrier frequency and the second input of the phase modulator through a pseudo-random sequence generator is connected to the output of the synchronizer, wherein the entered block upravlinnia current moreover, the outputs of the control unit connected to control inputs of n electronic switches, the outputs of which are connected to n inputs of the adder, the output of which is the output of the device, two other input of each of the electronic switches connected to the two poles of the DC source.

 

Same patents:

The invention relates to access control in a computer system

The invention relates to the field of telecommunications and computing, and more particularly to the field of cryptographic methods and devices for encrypting digital data

The invention relates to telecommunications and computing, and more particularly to cryptographic methods and devices for data encryption

The invention relates to communication and can be used in the transmission of telecode information in communication networks using RSA encryption with key General use

The invention relates to telecommunications and computing, and more particularly to cryptographic methods and devices for data encryption

The invention relates to the field of telecommunications and computing, and specifically to the field of cryptographic methods and devices for data encryption

The invention relates to the field of telecommunications and computing, and more particularly to the field of cryptographic methods and devices for data encryption

The invention relates to the field of telecommunications and computing, and more particularly to the field of cryptographic methods and devices for data encryption

The invention relates to the field of telecommunications and computing, and more particularly to the field of cryptographic methods and devices for data encryption

The invention relates to telecommunications and computing, and more particularly to cryptographic methods and devices for data encryption

The invention relates to communication technology and can be used in systems with a code multiplexing of signals in satellite communications

The invention relates to radio communication and radar systems

The invention relates to the field of radio and can be used in communication systems with broadband signals

The invention relates to the field of radio and can be used in communication systems with broadband signals

The invention relates to a transmitting system used in mobile radio stations for transmission of speech signals with the mobile station on the stationary

The invention relates to a transmitting system used in mobile radio stations for transmission of speech signals with the mobile station on the stationary

The invention relates to communication systems and particularly to systems in which communications are reused when terrestrial communications
Up!